The Use of Environmental Isotopes on Groundwater Hydrology in the Selected Areas in Thailand

Report No. IAEA - R - 4803-F

TITLE

The use of environmental isotopes on groundwater hydrology in the selected areas in Thailand

FINAL REPORT FOR THE PERIOD

1 September 1987 - 30 April 1990

AUTHOR(S)

Somkid Buapeng

INSTITUTE

Ground Water Division, Department of Minieral resources Bangkok/ Thailand

INTERNATIONAL ATOMIC ENERGY AGENCY

DATE November 1990 FINAL REPORT

THE USE OF ENVIRONMENTAL ISOTOPES ON GROUNDWATER HYDROLOGY IN THE SELEGTED AREAS IN THAILAND

PREPARED BY

SOMKID BUAPENG

DEPARTMENT OF MINERAL RESOURCES

BANGKOK, THAILAND

AUGUST 1990 The Use of Environmental Isotopes on Groundwater Hydrology in the Selected Areas in Thailand (Research Contract NO. RB/4803/R1/R3)

Submitted to International Atomic Energy Agency Vienna,Austria

August,1990 CONTENTS Page Abstract i 1. Introduction 2. Hydrogeology 1 2.1 Lower Chao Phraya Basin 1 2.2 Upper Chao Phraya Basin 3 2.3 Hat Yai Basin 6 3. Environmental Isotopes Sampling 4. Results of Chemical Analyses 8 4.1 Lower Chao phraya Basin 9 4.2 Upper Chao Phraya Basin 9 4.3 Hat Yai Basin 9 5. Evaluation and Interpretation of Isotopic Data 5.1 Lower Chao Phraya Basin (Bangkok Metropolitan Area) Stable Isotopes 9 Tritium and Carbon-14 23 5.2 Upper Chao Phraya Basin Stable Isotopes 28 Tritium and Carbon-14 32 5.3 Hat Yai Basin Stable Isotopes 32 Tritium and Carbon-14 37 6. Conclusions 37 7. Acknowledgements 38 8. Personnel Engaged in Project 39 9. References 40 10. Annex 1 Well Location and Details in Bangkok Metropolitan Area for Environmental 55 Isotopes study Annex 2 Well Location and Details in Upper Chao Phraya Basin for Environmental 68 Isotopes study Annex 3 Well Location and Details in Hat Yai Basin for Environmental Isotopes study 74 The Use of Environmental Isotopes on Groundwater Hydrology in the Selected Areas in Thailand

by Somkid Buapeng

Abstract The use of environmental isotopes on groundwater hydrology studies in the Lower Chao Phraya Basin, Thailand has been carried out during the past few years. Special research has been concentrated in the Bangkok Metropolitan where extensive exploitation of groundwater resulted in drastic lowering piezometric level, increasing in salinities as well as land subsidence. Upper Chao Phraya and Hat Yai Basin were later included in the same programme. Considerable samples of both groundwater and surface water samples were collected for isotopic and chemical analysis. Isotopic results of 180, 2H, tritium and C-14 indicate the relative age and origin of groundwater in the areas. Flow dynamic of the different aquifers and saltwater intrusion in aquifers in Bangkok Metropolitan area were also interpreted. 1. Introduction The Department of Mineral Resources in cooperation with the International Atomic Energy Agency, Vienna, Austria conducted a project entitled "The Use of Environmental Isotopes on Groundwater Hydrology Studies in the Selected Areas in Thailand under the Research contract No. RB/4803/R1/R3. This research project was commenced in 1988 for a duration of two and a half years. The purposes of the research study are to use the environmental isotopes to determine the origin of groundwater and the dynamics of groundwater flow system in the Bangkok Metropolitan Area, Upper Chao Phraya and Hat Yai Basins (Figure 1). The progress report of this project has been published in June 1988. This final report of the project contains a summary of water sampling, evaluation and interpretation of the results from,chemical and isotope analyses- It is recommended to consider this report together with the progress report to get an overall idea on the research study project.

2. Hydrogeology 2.1 Lower Chao Phraya Basin (Bangkok Metropolitan Area) The Bangkok Metropolitan area situated on the flood plain and delta of the Chao Phraya River which traverses the Lower Central Plain of Thailand, which is also known as the Lower Chao Phraya Basin. It extends about 200 kilometers from the north to the south and about 175 kilometers from the west to the east. The plain is bounded on the west by the mountain ranges about 100 kilometers from the Chao Phraya River, on the east by mountainous areas about 75 kilometers from the river, on the south by the Gulf of Thailand and on the north by series of small hills which divide it from the Upper Central Plain. The principal area of the project is the Bangkok and vicinity area, which consists about 1,000 square kilometers.

The basin has been planed off by past erosion into terraces that slope gently eastward and westward to the Chao Phraya River. The two distinguishable erosion surfaces in the basin are the younger terrace and alluvium. The topography of the basin is relatively flat with and elevation of 1 to 5 meters above mean sea level and a mean slope of less than 4 meters to 100 kilometers in the Bangkok lowland, and 15 meters with a mean slope of about 10 meters to 100 kilometers from the same datum at about 150 kilometers north. The Chao Phraya River has many tributaries flowing from the eastward slope of the mountain. Most of these streams are perennial. The drainage systems of the Pa Sak River, the Bang Pakong River, the Tha Chin River, and their tributaries are also included in the basin, making the total drainage area of about 55,000 square kilometers. CtiAO PHRAYA

?V) CHE

THAILAND 0

EXPLANATION

Boundarist of phyciographie provinces NORTHERN HIGHLANDS

UPPER CENTRAL PLAIN LOWER CENTRAL PLAIN KHORAT PLATEAU EASTERN PROVINCES PENINSULA STUDY AREA -o?

03 _ -09

103 103

Eig. 1 : Location map of study areas. The mean annual rainfall is 1,190 mm in the Lower Central Plain and 1,477 mm in Bangkok. August and September have the highest rainfall. The mean annual flow in the Chao Phraya River is 920 mVsec.The average annual evapotranspiration is 970 mm. The geological formations involved in the transmission and confinement of water in Bangkok Metropolis are the basement complex and alluvial deposits. The alluvial deposits constitute of the principal aquifers in the study area. Figure 2 shows the hydrogeological conditions of the Lower Central Plain. The principal aquifers in the Bangkok Metropolitan area are unconsolidated deposits. Based on the data of electric logs and drilled logs, the unconsolidated deposits in the upper 600 m depth are subdivided into 8 principal artesian aquifers separated by thick confining clay or sandy clay layers (Figure 2). All eight principal aquifers, from top to bottom are : 1. Bangkok Aquifer ( 50 m zone) 2. Phra Pradaeng Aquifer (100 m zone) • 3. Nakhon Luang Aquifer (150 m zone) 4. Nonthaburi Aquifer (200 m zone) 5. Sam Khok Aquifer (300 m zone) 6. Phaya Thai Aquifer (350 m zone) 7. Thon Buri Aquifer (450 m zone) 8. Pak Nam Aquifer (550 m zone) 2.2 Upper Chao Phraya Basin The Upper Chao Phraya Basin, the depressed structural basin occupies an area of about 5,900 km^. it covers some parts of six provinces namely, Uttaradit, Sukhothai, Kam- phaeng Phet, Phitsanulok, Phichit and Nakhon Sawan. Mountain ranges that bounded its northern boundary are mostly formed by the Permo-Carboniferous sedimentary rocks. On the west is bounded by granitic rocks and Palaeozoic sediments. Its eastern escarpment comprises of Mesozoic sandstone as well as granitic belts of various ages. The southern part of the basin is limited by sequences of Devonian to Silurian metamorphic rocks. The main rivers in the basin are Ping, Wang, Yom and Nan which flow from north to south and come into concur- rence at Nakhon Sawan Province. The mean annual rainfall is 1,202 mm and the mean annual evapotranspiration is 887 mm. The Upper Chao Phraya Basin is geomorphologically a great dissected terrace over which flood plains of the Ping, Nan Rivers and their tributaries were formed. The alluvial sediments have been accumulated in the basin under the fluviatile environment since Tertiary, forming the total thickness of about 250 meters. Geomorphologically, the bas;.n can be classified into 3 types namely, the Alluvium (Chao Phraya Aquifers), the Younger Terrace (Chiang Rai Aquifers) and the Older Terrace (Chiang Mai Aquifers) (Figure 3). 30- EXPLANATION

I I Alluvial deposits

Younger Terrace deposits

Colluvial deposits

Cavernous Limestone/Bedded Limestone

Metasediments and metamorphic rocks

Volcanic rocks/Granitic rocks

N.. SINGBURI AYUTHAYA BANGKOK SAMUT PRAKAN

Bid rocks

I. BANGKOK AQUIFER 5. SAM KHOK AQUIFER

Z. PHRA PRADAENG AQUIFER 6. PHAYA THAI AQUIFER

3. NAKHON LUANG AQUIFER 7. THON BURI AQUIFER

4. NONTHABURI AQUIFER 8. PAK NAM AQUIFER

Fig. 2. Hydrogeological map and hydrogeological N-S profile of the Lower Central Plain. ^ r^.^ . r.^r^|A|

Kllom»»«rt

Chao Phraya aquifers '-*—H Chiang Mai aquifers

Chiang Rai aquifers Consolidated rocks

Fig. 3. Hydrogeological map of the Upper Chao Phraya Basin. Aquifer System 1. Alluvium (Chao Phraya Aquifers) The formation is characterized by the forming of young alluvium and alluvial fans whcih occur in flood plain and meander belts as well as along the river courses. It is composed of well sorted young sediments such as sand, gravel, pebble, silt and clay being deposited along the meander belts of the Ping, Yom and Nan Rivers. The depth to the top of aquifer ranges from 10-30 meters. The considerable quantity of groundwater from 70-100 m /hr is very common. 2. Younger Terrace (Chiang Rai Aquifers) The low terrace deposits have been recognized by its relatively flat surface next to the rolling area of high terrace. Paddy land beyond the river courses are the indication where the low terrace can be found. The formation composes of thick sequence of clay with wide variety of clastic sediments and poorly sorted rock fragments. Its thickness rarely exceed 50 meters. Due to the compositions of clay and clayey sand with poorly assortment characteristics, it is relatively less productive.

3. Older Terrace (Chiang Mai Aquifers) This formation occurs extensively along the basin's margins especially on the western part. It .Is also concealed under the younger formations in the central of the basin. The rolling surface topography along the periphery of the basin usually indicates the high terrace. Bore holes and geophysical information reveal that the depth to the top of aquifer ranges in depth from 30 meters at the periphery to deeper than 150 meters at its trough. Sand, gravel and clay are the major composition of the aquifer which form artesian condition. There are more than 2 sub-aquifers consisting of layers of moderately to well sorted sand and gravel being separated by thick confining clay beds. The aquifer is so permeable and considered to be one of the most productive with relatively high transmissivity•

3.3 Hat Yai Basin Hat Yai Basin is the sedimentary basin in the southern part of Thailand. The basin is bounded on the east, west and south by the mountain ranges, and on the north by the Thale Sap Songkla (Figure 4). The main river in the basin is Klong U Ta Phao, which flows to the Thale Sap Songkla in the north. The principal area of concern is about 500 km^. Aquifer System The Hat Yai Basin consists of the unconsolidated sediments of clay, sand and gravel ranging in age from Tertiary to Quaternary. Figure 4. is the hydrogeological map of Hat Yai Basin. There are 2 main aquifers in Hat Yai Basin : the upper aquifer (Hat Yai Aquifer) and the lower aquifer (Khu Tao Aquifer and Kho Hong Aquifer). Beach Sand & Natural Levee

Young Alluvium

Old Alluvium

E^3 Consolidated rocks

—B-

HS7/

Fig. 4. Hydrogeological map and geologic cross-section of the Hat Yai Basin. 1. Hat Yai Aquifer The aquifer is semi-artesian, consisted of moderately to well sorted sand, gravel and pebble. The depth to the top of aquifer is not more than 50 m. The aquifer is highly productive with a yield of 20-50 m /hr. 2. Khu Tao Aquifer It is separated from the upper aquifer by the confining clay layer. The aquifer is artesian, consisted of poorly sorted sand, gravel and several clay layers. The depth to the top of aquifer ranges from 50 to 100 m . Yield slightly less than the upper aquifer. 3. Kho Hong Aquifer It is the deepest aquifer which consisted of unconsolidated to semiconsolidated clay, sand and gravel. The depth to the top of aquifer is about 100 to 200 m below ground surface. The aquifer is less productive and is not popular for drilling of water well. 3. Environmental Isotopes Sampling Groundwater and surface water sampling were carried out from December 1987 to September 1989 for stable isotopes, tritium, carbon-14 and chemical analyses. A total of 158 samples were collected,55 samples from the Bangkok Metropolitan Area, 52 samples from the Upper Chao Phraya Basin and 51 samples from Hat Yai Basin. The details of locations and specification of wells selected for environmental isotopes study are shown in Annex 1, 2 and 3.

4. Results of Chemical Analyses A total of 155 groundwater, river and surface reservoir water samples were collected at the same time of collecting environmental isotopes samples in order to determine the hydrochemical characteristics of the water. Fourty-seven groundwater and 8 river water samples were from Bangkok Metropolitan area, 47 groundwater samples were from the Upper Chao Phraya Basin, and 47 groundwater, 4 river and lake water samples were from Hat Yai Basin. The analysis of the samples were carried out by the Groundwater Analysis and Research Sub-division of the Ground Water Division, Department of Mineral Resources.

Results of chemical analyses in the Bangkok Metropolis, the Upper Chao Phraya Basin and the Hat Yai Basin are shown in Table 1,2 and 3, respectively. The chemical analysis results of water samples from the Lower Chao Phraya Basin in the earlier programme are also included in Table 1. Evaluation and Interpretation of Chemical Results 4.1 Lower Chao Phraya Basin (Bangkok Metropolitan Area) Groundwater samples in Bangkok Metropolitan area were collected from aquifers at depth of 50-566 meters. Eight water samples from the Chao Phraya and Tha Chin river were also collected. The results of chemical analysis of groundwater and river samples were evaluated by using Piper diagram (Figure 5). The groundwater are generally found in 3 main types:Na-K-CO3-HCO3 type, Ca-Mg-CO3-HCC>3type and Na-K-Cl-SO4 type. Most groundwater with high concentrations of chloride, sulphate, sodium and magnesium have been found in Phra Pradaeng, Nakhon Luang and Nontha- buri aquifers, in the south and southwest area of Bangkok city adjacent to the Gulf of Thailand.

Chemical analyses of water from the Chao Phraya river show high contents of sodium, magnesium, chloride and sulphate in the river mouth (Table 1). 4.2 Upper Chao Phraya Basin A total of 47 samples from different depths of unconsolidated and consolidated rocks were collected for chemical analysis. The results of chemical analysis are shown in Table 2. The main types of groundwater from aquifers at depth of 20 to 160 meters are of Ca-Mg-CO3-HCO3 and Na- K-CO3-HCO3 (Figure 6). Only 2 samples (THN7 and 9) with high contents of chloride and sodium were found in the south of the basin. Groundwater quality in the Upper Chao Phraya basin in generally suitable for domestic purpose. However, in some areas, iron and manganese are over the maximum allowable of WHO Drinking Water Standards. 4.3 Hat Yai Basin Groundwater samples were collected from unconsolidated aquifers at depth of about 18-120 meters for chemical analysis. Water samples from the main river and lagoon were also collected. Table 3 shows the chemical results of ground water and surface water samples. Groundwater from different depths of aquifer are mainly of Ca-Mg-CO3-HCO3 and Na-K-SO4~Cl type (Figure 7). The water with high concentrations of chloride, iron, manganese and sodium have been found in the north of the basin along the shoreline. The quality of water from the main river in the basin is generally suitable for domestic uses. However, the water quality of Songkhla Lake contains high chloride, sulphate, sodium and magnesium.

5. Evaluation and Interpretation of Isotopic Data 5.1 Lower Chao Phraya Basin (Bangkok Metropolitan Area) Stable Isotopes Groundwater from different aquifers at depth of about 40 to 560 meters and rivers were collected for stable isotopes analysis in the Bangkok Metropolitan area. Forty seven samples were from groundwater and 8 samples were from the Chao Phraya River and Tha Chin River. Figure 8 shows location of water 10

iM .«tS S I littr II II I I tail if ilwWri

Fig. 5 : Piper diagrame of Bangkok Metropolitan Area 11

m .*i§ S ! mm* pit t i

Fig. 6 : Piper Diagrame of the Upper Chao Phraya Basin 12

RMjpoi ~ll5 S ! prill* )''i i t M« if tfwtm

% % c«

P«r*«at «f t»t«l •«uiv«l«iit6

Fig. 7 : Piper Diagrame of the Hat Yai Basin 13

100* IS' 100*45'

km. Scale

Fig. 8 : Map showing the location of selected wells for environmental isotopes sampling in Bangkok Metropolitan Area 14

samples collected from wells and rivers in Bangkok Metropolitan area. The results of 18(3 and 2H contents of water samples are given in Table 4. The evaluvation and interpretation of 18o and *H results are also based on the results of stable isotopes analysis from the earlier programme of the Lower Chao Phraya basin. The long-term weighted mean annual values in Bangkok 8 2 precipitation during 1969-1984 for 1 O is - 6.637o«,and H - 44.2%O. The relationship of^80 and 2H of monthly precipitation in Bangkok station is shown in Figure 9. The long-term weight mean monthly values in Bangkok precipitation fori^o is-6.637<,oand 2H is-457oo (Figure 10).

The river water from the lower part and at the mouth of the Chao Phraya River (THS 3, 4, 6) contain 180 and 2H contents higher than the monthly mean of Bangkok precipitation. The quality of these river water samples are highly mineralized of Na-Mg-Cl-SO,type. It can be interpreted that a mixing process was taken place between a fresh water and a brackish/saline water (Figure 11). River waters from the upper part of the river (THS 1, 2) and the Tha Chin river (THS 7, 8) which are fresh water also show higher 180 and 2H contents than the monthly mean of Bangkok precipitation. It can be concluded that the enriched in 18O and 2H of the water due to evaporation effect. 18 0 and 2H contents of Groundwater 0 and H contents of groundwater in the Lower Chao Phraya Basin range from - 1.03 to - 7.9%oand - 16.2 to - 59.5%o, respectively. Tha groundwater in the upper area of the Lower Chao Phraya Basin have quite similar l°0 and 2H contents and almost follow the meteoric waterline (Figure 12). The origin of these groundwater can be directly from the local rainfall. For groundwater in the Bangkok Metropolitan Area, l®0 an(j 2fj are almost far below the meteoric waterline (Figure 13). The ^0 and ^H contents are higher than in the Bangkok precipitation. The origin of this groundwater can be the evaporated water which infiltrated into aquifer in the past. The spatial distribution of stable isotopes in the study area is shown in Figure 14. The decrease of 18 o and ^-E contents when the distance from the sea increases can be observed. This can be due to the continental effect or seasonal variations of the recharge. (IAEA, 1986).

Isotopic results in each aquifers can be discussed as follows : Bangkok and Shallow Aquifers Bangkok aquifer is the top most aquifer of Bangkok aquifer system and the shallow aquifers are in the upper part of the Lower Chao Phraya Basin. *80 and ^H contents in ground water from these aquifers in the upper part of the basin fall in the meteoric wateriine (Figure 15). However,some water samples are below the meteoric waterline (THB 43, 50, 49, 36). It can be concluded that the origin of this groundwater is mainly from the rainfall directly infiltrated into aquifers and also 15

40 I I I

-20 o •o

-40

-60

-80 1 1 1 -8 -4

6180,(%o) 18, Fig. 9 : 0 and D relationship in monthly precipitation in Bangkok Metropolitan Area

30 i i i i i i i i i i i i i i i i i r

rr I I I I I _ I 1 I I I I III I I -10 -2

6180,(%o) ,

18 Fig. 10 : 0 and . D plot of mean monthly precipitation values in Bangkok Metropolitan Area 16

Jl I I | 1 1 1 I | 1 I I 1 | II 1 1 1 'i 1 1i i i 111111 1 1 ! 1 1 1 1 1 l_ 1

l8 -10 6D = 86 0 + l0> 0.6 _I 0035 \

-20 0 y > — / 0. 4 I o -30 o .1 / o<

/ n.l Mil l -40 —

-50 Mil l

— | | -60 i I i i 1 i I i i 1 i i i i i i i i i i 1111 IMMI i i i i 1 i i i i -9 -8 -7 -6 -5 -4 -3 -2 -1

6180,(%o)

18 ' Fig. 11^ 0 and D relationship in river water along the Chao Phraya and Tha Chin river 17

-10 •8, 6D=a6 O + io

-20

o 3? -30

-40

-50

I la I I I I I I I I I I I I I II I I 1 I I T I i I I 1 1 I 1 I 1 I I I I -9 -8 -7 -6 -5 -4 -3 -2 -i

6180,(%o)

Fig. 12 : 180 and D relationship in groundwater in the upper part of the Lower Chao Phraya Basin

I I I i ! II I I I I I I Ii 1i Ii Ii Ii Ii Ii Mi i Ii Ii Ii Ii Ii iM I I I I I I I I I I I I I

-10 • Groundwater 6D = 8 <5I8O + IO • River -20

3$ --30 Q

-40

-50

-3 -2 -1

6180,(%o)

Fig. 13 : 180, and D relationship in groundwater and river in Bangkok Metropolitan Area 18

GULF OF THAILAND

10 20 =•— Km.

•1.09 Oxygen -18 •9.4 Deuterium

18 Fig. 14 : 0 and D contents distribuition in Bangkok Metropolitan Area 19

from precipitation which is effected by evaporation process. In Bangkok Metropolitan Area, stable isotopes in groundwater from Bangkok aquifer is below the meteoric waterline (Figure 15). It shows higher contents of ^0 ancj 2H than in the shallow aquifers in the upper basin. The groundwater also contains high contents of chloride and sodium. For this high mineralized groundwater indication leads to the conclusion that a mixing process was taken place between low-mineralized groundwater and brackish-saline-water. Phra Pradaeng Aquifer A total of 25 samples were collected from the Phra Pradaeng aquifer and about io samples are in the Bangkok Metro- politan area. Results of ^0 and 2JJ analyses are shown in Table 5. Stable isotopes contents in groundwater from this aquifer are generally below the meteoric waterline (Figure 16). It means that the origin of groundwater was local precipitation and was exposed to evaporation and/or mixing with brackish-saline water. The groundwaters in the upper part are fresh water and show the contents of 18o and 2H far below the meteoric waterline. It can be concluded that the origin of groundwater is from precipitation which exposed to evaporation before infiltrated into aquifer.

In Bangkok metropolitan area, ^0 and ^H contents of groundwater are almost far below the' meteoric waterline (Figure 17). Chemical results show that most of groundwater are fresh water except samples collected from well THB 81, 91 and 107 are high chloride contents. This can be concluded that orgin of fresh groundwaters is from precipitation with evaporation taken place in the past and saline groundwater is from precipitation and effected by mixing process. It is likely that seawater intrusion has occurred in this aquifer (THB 90) in the area near the coastal line of Samut Sakhon Province. Nakhon Luang Aquifer Stable isotopes contents of groundwater from the Nakhon Luang aquifer are generally similar to the Phra Pradaeng aquifer. The groundwater in the upper basin are mostly fall on the meteoric waterline (Figure 18). This impiles that ground water in the Nakhon Luang aquifer can have a precipitation origin directly infiltrated into aquifer. In Bangkok Metropo- litan they are below the meteoric waterline (Figure 19). Results of chemical analysis show 2 groups of groundwater : freshwater and brackish-saline water. High concentrations of chloride from 698 to 16,000 mg/L (THB 96, 93, 74, 90, 87) were found in the south and south-west of Bangkok (Figure 19).

This can be assumed that origin of freshwater is from precipitation effected by evaporation before infiltrated into aquifer. For the brackish-saline water, a mixing process was occurred between fresh water component and a brackish-saline water. 20

i i i i i i I i i i I I i i \t\ i i i i r 11 i i iiii i r i i i i i i i

-20

-30 Evaporated line o

-40

I I ! 1 t I I t I I I t I t I I I -9 -8 -7 -6 -5 -4 -3 -2 -1

6180,(%o)

0 Groundwater from the Shallow Aquifers 1 Groundwater from the Bangkok Aquifer

• River

18 Fig. 15 : 0 and D relationsuip in river and groundwater from the Bangkok and the shallow aquifers 21

i i r i j i i i i I i ir T [ i i i i I i i i I i ur i | IT f i | i, i i i | i i i

-10 _ I Groundwater in Bangkok - 2 GroOndwater in the Upper part of the basin • (J) River -20

Z--30

-40

-50

-60 i ' i I' I i ' ' i I i i i i I i i i i I i i i i I i i i i I i i i i..J i i i i I .i i i i -9 -8 -7 -6 -5 -4 -3 -2 -1 0

6180,(%o)

Fig. 16 : 180 and D relationship in river and groundwater of the Phra Pradaeng aquifer in the Lower Chao Phraya Basin.

1 t 1 1 1 1 1 1 i 1 1 t t 1 in i | ini i I i i ir| i i ir 1 1

-10 18 6D = 68 o + io

-20

-* -30 Q

-9 -S -7 -6 -5 -4 -3 -2 -1

6180,(%o)

18 Fig. 17 : 0 and D relationship in groundwater of the Phra Pradaeng aquifer in Bangkok Metropolitan Area 22

JIM | 1 1 1 1 1 1i i i 1 i i i 11 ! 1 1 1 i i i i 1 ' '1 1 1 k L, 1 1 j 1 1 1 1 I i Groundwater in Bangkok 11 1 -10 2 Groundwater in the upper part of the basin / i - - Q River / -20 / l8 — <5D = 8 6 O+io y — _ ® — -30 — y 1 _ y 'I If L ® — o / 1 : -40 — m T 1 I -50 y4 - / 2 - — ./ 2 I -60 1 1 i2l i i i i ! i i 11111 i , 1 1 1 1 III t * 1 i i 1 1 1 1 1 1 1 1 1 1 1 1 -9 -8 -7 -6 -5 -4 -3 -2 -1 618O, (%o)

1 R Fig. 18 : 0 and D relationship in groundwater. of the Nakhon Luang aquifer.

_ 1 1 i i ' ' ' 1 ' i i 1 i > * -

- 2140 Chloride Concentration (mg/l) y -10 — ISlQdE I 1 ! Mil l / 18 2140 6D=8 6 0 + 10 -20 Mil l y

8460 - r-30 1 150 ^ 8O S.5 69S -40 Il l 1 t | Mill ! Mil l m -50 58 - 14 — -60 £•=; i i i 1 i i 1 i i ~ -8.4 -6.4 -4..4 -2.4 -0.4 6180/%o)

18 Fig. 19 : 0 and D relationship-"in ground-water of the Nakhon Luang aquifer (Cl code) 23

Nonthaburi Aquifer Groundwater samples of Nonthaburi aquifer were collected only in the Bangkok Metropolitan area. The *80 and 2H contents are situated in the ^H, ^0 diagram on a straight line below the meteoric waterline (Figure 20). From the chemical and isotopic data, it can be concluded that the ground water of the Nonthaburi aquifer has an origin from rainfall which effected by evaporation. Deeper Aquifers For the deeper aquifers which depth is greater than 250 meters, only 6 samples can be collected from aquifers at depth of 280 to 566 meters. The *8O and 2H contents of the deeper aquifers are almost the same characteristics. It is generally fall on the meteoric waterline (Figure 21) except samples THE 99. From the chemical and isotopic data, it can be explained that groundwater from tha deeper aquifers have an origin from precipitation directly infiltrated into aquifer. Tritium and Carbon-14 A total of 54 water samples from wells tapped at different aquifer and reivers were collected for tritium analysis in the Bangkok Metropolitan area. However, only 20 samples from groundwater and 8 river samples tritium results are available. The results of tritium of these samples are shown in Table 4. Tritium contents in groundwater range from 0.0 to 1.4 T.U. ± 0.6 error and in rivers are 3.2 to 5.3 T.U. t 0.4 error. The tritium contents in precipitation in Bangkok from 1953-1988 are shown in Figure 22. It means that groundwater in different depth of aquifers in Bangkok are older than 40 years.

The results of carbon-14 analysis from groundwater samples in the Lower Chao Phraya Basin show that younger age/ modern groundwater has been found in the upper part of the basin (Figure 23). A total of 34 samples of Carbon-14 results are available in the Bangkok Metropolitan area as shown in Table 4. The minimum of Carbon-14 contents is 0.5 ppmc. The distribution Carbon-14 age of groundwater in Bangkok Metropolitan area is shown in Figure 24. Ages of groundwater from the Phra Pradaeng aquifer range from 7,400 ± 2,800 error to 10,600 ± 3,100 error years. The groundwater age of 39,000 t 5,200 error years has been found in the eastern part of Bangkok. For Nakhon Luang aquifer, groundwater range from 11,000 ± 3,100 error to 16,900± 2,700 error years. The oldest groundwater of about+40,000 years also has been found in the east of Bangkok area. The groundwater age of Nonthaburi aquifer has been found from 12,100 ± 2,900 error to 29,300 ± 6,100 error years. For the deeper aquifers (depth of 300-600 meters), age of groundwater range from 12,600 ± 3,300 error to 39,000 years. It can be observed that the oldest groundwater are found in the area of Bangkok and Samut Prakan city. The increasing ages of ground water are from north to south along the general flow direction. - \J _l 1 1 1 | 1 1 1 1 | 1 1 1 1 "i i i i | r I1 1 1 | M IT Mil yi 1 "Mil

-10 ~" • Groundwater l8 <5D = 86 O + 1o —* i •/ " \ _ i -20 • River / m _ / l -30 — •j —

-50 —

-60 i i i i 1 i i i i 1 i i i i 1 ii i t 1 i 1 1 t 1 M i i 1 i i i i 1 i i i i I i i i i -9 -8 -7 -6 -4 -3 -2 -1 6180,(%o)

1 ft Fig. 20 : 0 and D relationship in groundwater of the Nonthaburi aquifer

i i i I i i i i I i i n \\i i i M i i i i i i ] i i i I i i i i j i i i

-10 5 Aquifer No. ' 6D= 8 6l8O+io -20 a

-40

-50

_g0 I t I i I I I I I M I i i I I i I i 1 1 I I I I I I I I I I t I I I I I I I I I I I I I -9 -8 -7 -6 -5 -4 -3 -2 -1 0

6180,(%o)

18 Fig. 21 : 0 and D relationship in groundwater of Deep Aquifers in Bangkok Metropolitan Area 25

10C0 — I I I I I I I I I I I I I I I I I I I —

100

I I I I I I I I I I I I I 500

Fig. 22. Monthly of the tritium concentrations in the precipitation in Bangkok. 26

a Nakhon Savran

16.9 Orbon-14 age (xlOOO) (2.3) Age error (xlOOO)

Fig. 23. Carbon-14 ages distribution in the Lower Chao Phraya Basin. 27

81/10,600 4/13,500 )) 80/11,000 79/18,300 O 5/I7.2O0 O 93/l6 S00 BANGKOK 6/l4i200o - 94/2,700 84/16,400 0 9/13,900

SAMUT SAKHON

61/38,000

10 20 ^— Km.

,9/10,900: Sample no/ C-14 age

Fig. 24 : Carbon-14 ages distribution in Bangkok Metropolitan Area. 28

The approximately flow velocity from the calculation of carbon-14 age results in the Phra Pradaeng and the Nonthaburi aquifer is about 1-2 centimeters/day, while in Nakhon Luang aquifer is about 4 centimeters/day. It is confirmed that the groundwater flow in the Lower Chao Phraya basin is very slow and the direction of flow is mainly from north to south accor- ding to hydrogeological studies.

5.2 Upper Chao Phraya Basin Stable Isotopes Results of stable isotopes analysis using for interpretation and evaluation are from the first and second sampling as shown in Table 5. The first sampling was done in 1983 during the earlier RCA programme. . 1&0 and ^-H contents of groundwater range from - 8.55 to - 3.91%«and - 63.9 to-42.9%o, respectively. Rivers and reservoirs contain ^0 of _ 6.01 to - 5.42%«and ^H of - 46.1 to - 38.3%o. It can be observed from the results of both samplings that stable isotopes contents are almost thr same characteristics (Figure 25 and 26). Generally, groundwater in the Upper Chao Phraya basin contains ^0 and *H lower than in the Lower Chao Phraya basin. It can be observed from figure 27 the groundwater in the northern area contains lower ^0 and 2H compare to groundwater in the southern part of the basin.

Figure 28 shows graph of 18o and 2H contents of ground water and rivers during the first sampling. There are 2 groups of groundwater, one is follow the meteoric waterline and the other is off the line. Groundwater samples which follow the meteoric waterline contain (THN 1, 35, 14,18) lower contents of 160 and 2H. It means that the origin of this groundwater are from precipitation of high altitude in the north and northwest of the basin. The other samples of groundwater which follow the meteoric waterline (THN 28, 19, 11, 4 and 6) contain 180 and ^H similar to the local rainfall. It can be concluded that the groundwater replenished from the local recharge area. It is also observed that some samples of groundwater are follow the meteoric waterline and have 18o and 2H contents in between those two groups. This impiles that mixing occurred between the groundwater recharge from high altitude and local recharge.

The rest of samples are below the meteoric waterline. It can be divided into 2 groups. One group (THN 20, 34, 39, 43) has 18Qanc j 2jf contents far below the meteoric waterline. This means that the groundwater can have an origin from precipitation with evaporation effect. The other group of water contains *&0 and ^H higher than the first one and are below the meteoric waterline. Some samples (THN 24, 25, 27) have almost the same l®0 and ^H contents to the river. This impiles that this ground water can have an origin from mixing of local recharge, high altitude rainfall and rivers. It can be concluded that the origin of groundwater in the Upper Chao Phraya basin is from high altitude rainfall and local rainfall recharge into aquifers. In some areas river water also recharges into aquifer. The groundwater flow is very slow and generally flows from north to south and from the periphery to the centre of the basin. 29

-10 I I I I I I I I I I I I I ] rTTTl II I I I I I M il M U I I I Tl I 1

-20 6D= 8 6 O+io

— -30 • Groundwater I • River § "40

-50

-60

— f?Q I I t | I I I I I I [ ) I | 1 | | | . f,, ,t I I I |. , 1 ,,,| . |, I 1 I ' I I 1 I I t L_I_ -10 -9 -3 -7 -6 -5 -4 -3- -1 6180,(%o)

Fig. 25 : 180 and D relationship in groundwater for the first sampling in the Upper Chao Phraya Basin

-10 i i i i I i i i i i i i n ii i i ! ii i i i ii i i i i i i i i i i i i i i i i i i

-20 6D= 8 6'l8 OO + io at"30

Q 10 -40

-50

-60

i i i \ \ i i i i i i i i i -10 -9 -3 -7 -6 -3 -2 -1

6180,(%o)

18 Fig. 26 : 0 and D relationship in groundwater for the second sampling in the Upper Chao Phraya Basin 30

-f vi i Oxygen -18 -43.91 [)eut.num

BHUMIPOL DAM

BORAPHET RESERVOIR

18 Fig. 27. 0 and D distribution in the Upper Chao Phraya Basin. 31

-34 i i i i i i i 0.4 -39

-9.2 -3.2 -7.2 -6.2

6180,(%o)

1 o Fig. 28 : 0 and D relationship in groundwater and rivers in the Upper Chao Phraya Basin 32

Tritium and Carbon-14 Results of tritium analyses of groundwater and river samples are shown in Table 6. Tritium contents in groundwater range from 0.0 to 8.5 T.U. and in river samples are 6.5 to 7.5 T.U. This means that groundwater in this area is recent to older than 40 years. It can be observed that the tritium content trend to decrease when the depth of aquifer increases. Most of groundwater from aquifer at depth of about 15-40 meters contains higher tritium (2 to 8.5 T.U.) while groundwater from aquifer at depth of about 40-165 meters contain tritium of 0.0 to 1.5 T.U. This impiles that groundwater from shallow aquifers are younger than the deeper aquifers. The recent water recharged to the shallow aquifer 30 or 40 years ago. In the deeper aquifers, water flows from the high altitude recharge area in the mountainous area in the northern, eastern and western of the basin.

Carbon-13 and carbon-14 contents of groundwater samples are also shown in Table 6. Calculated carbon-14 ages of ground water are modern to 40,000 ± 2,400 years. Most of groundwater from shallow aquifers are modern while from the deeper aquifer are old ages which conform to the tritium results. The distribution of carbon-14 ages is shown in Figure 29. An increase of carbon-14 ages are from north to south and from the eastern and the western areas to the centre of the basin. It is in agreement with the direction of groundwater flow, which coming from the recharge area located in the northern, eastern and western mountainous area of the basin.

5.3 Hat Yai Basin Stable Isotopes A total of 48 groundwater and 4 river and lagoon samples were collected for isotope analysis in two peroids. The results of overall data of 1*0 and *H in Hat Yai basin are shown in Table 6. Groundwater samples from aquifers at different depth show similar characteristic of stable isotopes. It contains 1*0 of - 5.72 to - 8,14%oand ^H of - 30.6 to 52.6%.. 18 2 The river has 0 content of - 6.06 to - 5.28%O and H content of - 37.4 to - 32.6%,where the lagoon have ™0 and ?H _ o.78 to - 0.06%»and - 7.8 to - 3.4%o,respectively.

It can be seen from Figure 30 that the 18 o and 2H contents are almost follow the meteoric waterline and have similar stable isotope contents to river. It can be explained that this groundwater can have an origin from local precipitation and river water. Some samples are off the waterline and have lower contents of stable isotopes ( l^o less than - 7.5%O). The origin of this groundwater can be from the precipitation in the high altitude recharge area. The distribution of l^o and ^H contents are shown in Figure 31. It can be observed that groundwater from the shallow aquifer along the river at the centre of the basin contain 18 o and ^H similar to the river. It indicates that the origin of shallow groundwater is also from river water. 33

UTTARADIT 23/Modern

25/Modern o /Modern

32/15,200

o o36/9,300 ^27/3,800

5/Modem 0 Oo29/Modeni 42/Modem 47/4,100

KAMPHAENG PHET

20/4,500 o 31/22,000 37/17,000 46/7,000 43/40,000 I9/Modern 44/10,600 ft 39/29,200 °

24/Mc

34/7,000 9/Modern o 12/8,800

NAKHON SAWAN 7/Modem

10 20 30 40 50 Km.

Fig. 29 : Carbon-14 age distribution in the Upper Chao Phraya Basin 34

i i i i i i i i i i i i i i i ri it IT i i i i i i i i i i i i r i i i i i 1.1 i FT 1

-10

6D= 8 6 0 + 10 -20

-30

-40

-50

III I I I I 1 111 I I I I I I I I I I I I 1 I I I I I I I I I I I I I I I I II! -9 -8 -7 -6 -5 -4 -3 -2-10 1

6180,(%o)

Ground water River and lagoon

"I O Fig. 30 : 0 and D relationship in groundwater and river in Hat Yai Basin 35

SONGKHLft

• 6.31 -41.4

1-7.21 1

-8.14 -32.3

Oxygen - 18 •8.14 -52.5 Deuterium

18 Fig. 31 : 0 and D contents distribution in Hat Yai Basin 36

O 22/33,000

23 /40.000

.SONGKHLA

1.7

2.8

10/7,900

12/5,900

-3.1 7/4,400

O 14/3,700 O

7/7,900 O . Sample no./C-14 age 0.6 Tritium Contents

Fig. 32 : Carbon-14 ages and tritium contents distribution in Hat Yai Basin 37

Tritium and Carbon-14 Results Tritium contents of groundwater and river and lagoon samples are also included in Table 6. In the river and lagoon, tritium contents of 2.3 to 2.6 T.U. have been found. The tritium concentrations of groundwater range from 0.0 to 2.8 T.U. The increasing of tritium contents with depth can be observed. Most of grour.dwater from aquifer at depth of 20-40 meters show high tritium contents of 1.5 to 3.8 T.U. and situated along the river at the centre of the basin (Figure 32). The groundwater from aquifers at depth of 40 to 125 meters have tritium contents less than 1 T.U.

It can be concluded that groundwater in the shallower aquifer have a recent local rainfall and river recharge, where groundwater in the deeper aquifer recharge from the precipitation at least 30-40 years ago. Carbon-14 results of groundwater in the Hat Yai basin are also shown in Table 6. About 12 samples are available for interpretation. Carbon-14 ages range from modern to 40,000 ± 9,800 error years. The ground water from shallow aquifer is younger while groundwater from the deeper aquifers are older. These results are in agreement with tritium. The oldest ground water has been found in the coastal plain (Figure 32). Carbon-14 ages increase from south to north follow the direction of ground water flow. 6. Conclusions The results of using environmental isotopes study in groundwater hydrology in Thailand, show that the origin of groundwater at different dopths of aquifer in the upper part of the Lower Chao Phraya Basin is mainly from precipitation. These groundwater flow with very slow rate down to the south of the basin and finally to Bangkok City and the Gulf of Thailand. The recharge area of Bangkok aquifers system can be considered at the area north of the Ayuthaya Province upto the north of the basin. The groundwater at different depths of aquifers in Bangkok Metropolitan area are the old ages and have origin from precipitation effected by evaporation and in some part a mixing processes between fresh water and brackish/saline water also occurred. It is confirmed that no direct recharge to the aquifers in the Bangkok area. Seawater intrusion in Bangkok aquifers has been found only in the area near the Gulf of Thailand.

In the Upper Chao Phraya basin, the origin of ground water is mainly from high altitude rainfall flow with a slow rate to the centre of the basin. However, in the shallow aquifer (less than 40 meters) the recharge is also from the local rainfall and rivers. Mixing processes between the high altitude rainfall, local rainfall and rivers have been observed. The generally groundwater flow is from north to south and from east and west to the centra of the basin. In Hat \ai basin, origin of groundwater is from high altitude rainfall in the south and periphery of the basin and also from local rainfall and river for the shallow aquifer. The flow direction of ground water is mainly from south to north. 38

7. Acknowledgements The author wishes to express her gratitude to the International Atomic Energy Agency, Vienna, for having initiated and supported this research project, to Dr. Y. Yurtsever for his coopertion, suggestion and discussion in preparation the project, collecting the samples and technical assistance. The cooperation and supporting the project of the Office of Atomic Energy for Peace, Bangkok, Thailand are greatfully acknowledged. The author also would like to express her deep appreciation for the continuing support and concern toward the successful of the project of Mr. Visit Noiphan, Director- General, Mr. Charoen Piancharoen and Mr. Suwit Watthanachan, Deputy Director-General and Dr. Vachi Ramnarong, Senior Hydrogeological expert of the Department of Mineral Resources.

Special thanks are due to the chemists of Ground water Analysis and Research Sub-division for their help in analysis of groundwater quality, the staff of Hydrogeology Sub-division for their assistance in collecting samples and Ms.Oranuj chandrangsu for her assistance in the preparation of this paper. 39

8. Personnel Engaged in Project

Mr. Suwit Watthanachan Supervisor Deputy. Director-General Department of Mineral Resources Dr. Vachi Ramnarong Technical Adviser Senior Hydrogeological Expert Department of Mineral Resources Ms. Somkid Buapeng Principal Investigator Senior Hydrogeologist Ground Water Division Department of Mineral Resources Mr, Teerawash Intrasuta Senior Hydrogeologist Ground Water Division Department of Mineral Resources

Mr. Samrit Chusanatha? Hydrogeolog i s t Ground Water Division Department of Mineral Resources Mr. Sa-nguansakdi Hydrogeologist Sungkhaburana Ground Water Division Department of Mineral Resources

Mrs. Aranya Fuangswasdi Hydrogeologist Ground Water Division Department of Mineral Resources 40

9. REFERENCES AIT, 1980, Water Balance and Economic Appraisal of Ground water Development Project in Sukhothai Province, Research Report No.119, Report prepared for the Royal Irrigation Department, Bangkok, Thailand. AIT (Asian Institute of Technology) and DMR (Department of Mineral Resources), 1982, Groundwater resources in the Bangkok area : Development and management study, a comprehensive report (1978-1982). Report prepared for the National Environment Board, Bangkok, Thailand.

Achalabuti, C, Petroleum geology of the Gulf of Thailand : Proc. Cof. on the Circum-Pacific Energy and Mineral Resources, Honolulu, Hawai. Buapeng, S., 1985, Saltwater intrusion in the Bangkok Metropolis : UNESCO Regional Workshop on Saltwater Intrusion in Large Coastal Cities, Manila, the Philippines. Chuamthaisong, C, Buapeng, S., Yuthamanop, A., 1982, Relative age dating of groundwater and the velocity of groundwater flow in the Lower Chao Phraya Basin, Ground Water Division, Department of Mineral Resources. Chuamthaisong, C, Buapeng, S., Yuthamanop, A., 1983, Groundwater age in the Lower Central Plain and Bangkok area : 2nd Technical meeting of the Department of Mineral Resources, Bangkok, Thailand (in Thai). Chulalongkorn University Social Research Institute, 1987, Post Impoundment Environmental Evaluation and Development Planning of the Bhumibol and Sirikit Projects : Vol.4 Physical Resources, Report prepared for the Electricity Generating Authority of Thailand. Hydrology Section, 1975, Record of wells in Bangkok and its adjacent area : Vol.E, Ground Water Division, Department of Mineral Resources. Hydrology Section, 1974, Drilled logs of Wells in Bangkok and its adjacent area : Vol.D., Ground Water Division, Department of Mineral Resources. International Atomic Energy Agency, 1986, Progress Report on Isotope Applications to Hydrology and Geothermal Studies in Northern Thailand (335-F3- THA-2521), Vienna, Austria. 41

Jarupongsakul, S., 1987, Stratigraphy of Bangkok clay and Holocene transgression of the Chao Phraya Delta, Central Thailand : M.A. Thesis, Division of Tropical Agriculture Graduate School of Agriculture, Kyoto University. Piancharoen, C, 1980, Groundwater condition in Bangkok Metropolis : Groundwater open-file report no.103, Ground Water Division, Department of Mineral Resources (in Thai). Piancharoen, C, Ramnarong, V., Buapeng, S., 1985, Ground water of Bangkok : special booklet for Krathin Ceremory, Bangkok, (in Thai). Ramnarong, V., Buapeng, S., 1980, Isochlor map of Phra Pradaeng, Nakhon Luang, Nonthaburi aquifers, Ground Water Division, Department of Mineral Resources. Ramnarong, V., Buapeng, S., 1980, Groundwater level map of Bangkok in 1979, Ground Water Division, Department of Mineral Resources. Ramnarong, V., Buapeng, S., 1984, Groundwater quality problems in Thailand : Int. Sym. on Hydrochemical balances of freshwater systems, Uppsala, Sweden. 42

TABLE 1. CHEMCAL ANALYSIS OF HATER SAMPLES (HG/L) FROM SELECTED WELLS FOR ISOTOPES STUDY IN BANGKOK METROPOLIS.

CODE SAMPLING HARDNESS K Fe HC0 N0 F DISSOLVED AS DATE pH Ca Hg Ha Hn CI S01 co3 3 3 CO- (DD-MM-YY) SOLIDS CaC03 ORDINATE (TOTAL)

THB-O1 02-21-80 7.1 55 11 100 0.19 0.63 75 4.3 0 352 0.4 0.1 490 181 THB-02 02-21-80 6.5 468 148 1.620 76 0.00 3,711 9.7 0 69 0.0 0.1 6.510 1.776 THB-03 02-21-80 7.6 39 11 106 0.07 0.11 8.5 26 0 411 0.0 0.2 470 144 THB-04 02-28-80 7.0 61 14 132 0.32 0.86 178 4 0 297 0.0 0.1 632 210 THB-05 03-04-80 7.4 24 7.6 124 0.29 0.23 3.9 16 0 413 0.0 0.2 462 91 THB-O6 03-05-80 7.1 35 19 105 0.54 0.17 80 4.7 0 336 0.0 0.2 508 165 THB-07 03-05-80 7.5 20 8.3 186 0.19 0.29 150 1.7 0 335 0.0 0.3 620 84 THB-08 03-05-80 7.0 34 18 154 1.10 0.51 148 15 0 328 0.0 0.2 640 158 THB-O9 03-05-80 7.1 42 22 97 0.70 0.11 75 2.3 0 366 0.0 0.3 514 196 THB-1O 03-07-80 8.9 13 7.7 9 1.50 0.00 20 4 4 55 0.0 0.1 170 64 THB-11 03-07-80 7.4 56 21 367 0.57 0.80 321 228 0 407 0.0 0.3 1.346 226 THB-12 03-07-80 7.8 42 38 452 0.61 0.86 405 335 0 394 0.0 0.2 1,586 260 THB-13 03-18-80 fi.5 7.2 11 130 0.28 0.06 10 67 18 286 0.0 0.3 490 65 THB-14 03-18-80 7.7 73 19 51 0.25 0.11 45 64 0 296 0.0 0.3 532 262 THB-15 03-19-80 7.3 45 17 65 0.15 0.00 14 3.3 0 371 0.0 0.1 434 184 THB-16 03-19-80 7.9 27 11 138 0.20 0.23 10 50 0 425 0.0 0.1 480 114 THB-17 03-22-80 7.2 47 11 0. 0.13 0.00 3.7 3.3 0 188 0.0 0.3 200 163 THB-18 03-22-80 7.2 48 13 0. 0..15 0.00 3.5 2 0 202 0.0 0.3 224 172 THB-19 03-23-80 6.9 134 9.2 138 0.25 0.00 198 57 0 408 0.0 0.2 832 372 THB-20 03-23-80 7.3 69 34 68 0.69 0.17 129 6.4 0 330 0.0 0.6 588 311 THB-21 04-28-81 7.3 42 9 81 7.4 0.49 0.33 50 59 0 243 1.0 0.4 416 142 689095 01-19-88 7.5 40 9.2 83 5.9 0.40 0 52 52 0 245 0.4 0.6 372 138 THB-22 05-02-81 6.3 20 3.9 22 5.3 5.40 0.93 6 2.8 0 144 0.0 0.1 156 66 THB-23 05-02-81 6.1 17 4.3 10 2.1 7.30 0.57 6 2.7 0 93 0.0 0.0 98 60 THB-24 05-03-81 6.7 76 49 248 2.0 2.90 0.10 290 197 0 588 4.7 0.1 1.256 390 THB-25 05-03-81 7.2 70 20 45 1.4 0.00 0.01 31 24 0 362 3.7 0.1 414 258 THB-26 05-03-81 6.5 33 7,5 22 1.8 19.00 1.40 41 2.5 0 141 0.0 0.0 200 113 THB-27 05-04-81 7.1 29 5.3 7. 1.1 1.40 0.67 8 3 0 121 0.0 0.1 134 94 THB-28 05-04-81 6.9 34 2.7 53 5 0.10 0.00 11 4.3 0 251 0.0 0.2 308 96 THB-29 05-04-81 6.8 26 7.6 10 4.1 11.00 0.63 37 3 0 147 0.0 0.0 146 96 THB-30 05-05-81 6.7 41 7.7 31 2.7 4.10 0.54 9 8.4 0 235 0.0 0.0 236 134 THB-31 05-05-81 6.6 24 5.9 10 2.1 18.00 2.90 12 3.3 0 111 0.1 0.0 132 84 THB-32 05-05-81 7.3 53 14 105 0.4 5.10 0.10 15 54 0 436 0.1 0.4 512 188 THB-33 05-06-81 6.8 18 4.9 12 1.8 0.51 0.70 8 3 0 108 CO 0.0 132 65 THB-34 05-06-81 6.7 30 7.6 12 3.2 6.70 2.10 13 17 0 133 2.3 0.0 170 106 63 THB-35 05-06-81 7.9 18 4.4 6. 2.2 1.20 0.18 6 2.8 0 95 0.0 0.1 116 265 THB-36 05-07-81 7.2 66 24 63 0.6 0.16 0.05 23 73 0 434 0.0 0.3 496 128 THB-37 05-07-81 8.0 40 6.9 29 0.7 0.09 0.10 15 20 0 187 0.0 0.3 206 161 THB-38 05-07-81 8.0 48 10 86 2.9 1.80 0.11 6 11 0 407 3.1 0.3 374 156 THB-39 05-08-81 7.2 47 9.4 157 1.8 0.15 0.32 72 45 0 443 0.2 0.1 562 0.05 0 402 386 THB-40 05-09-81 7.3 104 31 254 1.7 0.26 385 58 0.0 0.1 1,094 4.30 0 175 134 THB-41 05-09-81 7.0 38 9.5 16 3.9 0.35 17 12 0.8 0.1 184 0.04 0 438 334 THB-42 05-09-81 6.9 107 16 24 15.0 0.03 25 23 7.3 0.3 140 39.00 0 89 760 THB-43 05-10-81 6.7 168 83 321 2.9 3.10 985 23 0.0 0.0 1.972 0.10 0 108 74 THB-44 05-10-81 7.1 22 4.6 19 0.9 0.00 10 16 0.0 0.6 180 43

TABLE 1. (CONTINUE)

CODE SAMPLING HARDNESS DATE 1 Ca Mg Na K Fe Mn Cl SO4 CO3HC03 NO, F DISSOLVED AS CO- (DD-HM-YY) J J SOLIDS CaCO, ORDINATE (TOTAL)

THB-45 05-13-81 8;.o 19 1C 490 4.1 1.20 0.04 25 475 0 740 0.0 5.0 1,458 90 THB-46 05-14-81 7.6 26 4.7 88 4.1 0.77 0.00 58 2.6 0 244 0.0 0.2 332 84 THB-47 05-14-81 7.4 94 22 57 8.1 3.00 0.06 244 3.9 0 175 1.8 0.0 712 323 THB-48 05-15-81 6.9 44 44 376 3.1 2.70 0.78 540 109 0 420 0.0 0.2 1,396 292 THB-49 05-15-81 6.7 30 4.7 10 3.2 1.90 0.37 9 1.2 0 134 0.0 0.0 154 94 THB-50 05-15-81 6.7 58 9.1 20 2.8 13.00 0.75 13 9.9 0 285 0.0 0.1 264 182 THB-51 05-16-81 6.9 63 13 63 2.<> 0.05 0.05 41 69 0 265 0.0 0.2 434 210 THB-52 05-16-81 7.0 80 16 69 4.2 4.60 0.31 107 84 0 134 0.4 0.2 546 264 THB-53 05-19-81 7.4 44 28 158 2.8 5.70 0.00 100 129 0 318 0.2 0.3 642 225 THB-54 05-19-81 7.4 22 8.5 215 1.6 0.19 0.00 65 87 0 428 0.2 0.3 676 90 THB-55 05-20-81 6.7 185 92 805 12.0 25.00 2.20 1,285 602 0 215 0.0 0.1 3,300 84 THB-56 05-20-81 7.1 197 12 197 3.0 0.11 0.74 630 36 0 227 0.0 0.1 1,466 540 THB-57 05-20-81 6.5 32 3 115 5.3 10.00 0.36 15 134 0 237 0.0 0.2 444 92 THB-58 05-21-81 7.3 bO 52 112 6.1 0.11 0.02 210 54 0 376 0.0 0.8 744 340 THB-59 05-21-81 7.6 46 64 123 6,.5 2.70 0.00 218 16 0 565 0.0 0.3 836 380 THB-60 05-22-81 7.3 34 27 101 4.7 2.40 0.00 24 19 0 476 0.0 0.6 468 194 THB-61 05-22-81 7.7 38 20 81 4..3 0,.06 0,.00 9 25 0 408 0.0 0.7 398 176 THB-62 OJ-22-81 7.5 122 79 111 7,.2 0.13 0,.03 445 27 0 246 0.0 0.6 1.242 628 THB-63 05-20-81 7.7 34 23 405 6..8 1,.00 0,,01 500 92 0 389 0.2 0.4 1.314 180 THB-64 05-20-81 6-.8 108 53 535 8..6 13,.00 0,,12 849 263 0 319 0.2 0.1 2,144 488 THB-65 05-20-81 7..2 38 2.,2 124 4. 0 4..30 0,,43 52 140 0 207 0,.2 0.3 482 104 THB-66 05-25-81 7..2 59 6 82 7..3 4..00 0..03 145 1..5 0 199 0,.0 0.1 432 172 THB-67 05-25-81 6.,9 82 15 51 3.,9 0.,00 0,,00 24 30 0 391 0,.4 0.4 452 268 THB-68 08-05-82 7.,9 27 14 147 2. 1 0.08 0.,00 17 50 0 466 0,.0 0.3 502 123 748561 02-02-88 7.,6 29 8.6 166 1.6 1.2 0.li 33 62 0 435 0..0 0,.0 534 108 THB-69 08-05-82 7. 7 30 12 87 3.1 0.15 0.20 6 12 0 368 0..7 0,.3 364 123 459631 01-17-88 7.,5 30 6.6 90 2.7 0.42 0 6.4 10 0 351 0.,3 0,.2 352 101 THB-7O 07-28-82 7. 3 23 7. 2 151 3.1 0.06 0.00 30 20 0 434 0.4 0,.3 538 87 THB-71 07-28-82 7. 9 40 22 116 5.6 0.14 0.23 108 10 0 370 0.2 0,.2 524 189 THB-72 08-05-82 7. 5 29 16 120 6.2 0.20 0.00 61 13 0 390 0.0 0.,2 482 140 THB-73 08-03-82 7. 6 32 11 108 3.9 0.05 0.00 6.4 17 0 411 0.6 0.,3 416 124 THB-74 08-06-82 6.6 1.008 881 5.850 141 1.70 3.30 13,,597 1,185 0 9.6 - 0.2 25,504 6,140 498048 12-23-87 7. 0 872 906 6,299 114 9.0 5.3 12,,140 1,248 0 188 0.0 0.2 25,684 5,900 08-18-89 7. 2 776 983 5,680 117 2. 0 0.57 12. 400 1,520 0 23 0.0 0.1 27,100 5,980 THB-75 08-03-82 7. 1 36 12 77 5.2 0.15 0.05 7.5 16 0 362 1.2 0.2 408 141 THB-76 08-06-82 8.0 36 9.8 82 5.9 0.35 0.00 9.3 66 0 254 0.8 0.7 408 130 THB-77 01-18-88 7.6 30 7.8 205 7. 4 0.60 0 130 68 0 362 0.5 1.4 680 106 722014 THB-78 01-20-88 7. 4 29 9.0 115 6.3 1.1 0 83 48 0 243 0.3 0.8 446 109 662102 THB-79 12-01-87 7. 2 186 3.6 290 9.0 3.1 2. 4 800 16 0 232 0.1 0.1 1,860 480 564218 THB-80 12-02-87 7. 3 192 59 172 9.0 1.9 4. 6 640 12 0 221 0.0 0.1 1.500 720 564218 THB-81 12-01-87 7. 1 328 214 258 18 11 4.10 1.400 130 0 !44 OJ0 0.1 3,000 1,700 44

TABLE 1. (CONTINUE)

CODE SAMPLING HARDNESS DATE PH Ca Hg Na K Fe Hn Cl HCO3 N03 F DISSOLVED AS CO- (DD-HM-YY) SOLIDS CaCO, ORDINATE (TOTAL)

564218 THB-82 12-10-87 6.9 562 145 543 7.0 2.9 4.9 1,968 64 0 324 0.1 0.0 5.120 2.000 743438 THB-83 10-11-87 7.7 33 8.5 182 2.0 1.2 0.05 94 79 0 358 0.4 0.2 598 118 810318 THB-84 12-12-87 7.7 19 5.9 154 2.0 0.34 0.28 23 16 0 442 0.2 0.2 464 72 728158 THB-85 12-13-87 7.7 28 6.8 186 2.3 0.58 0 117 U 0 349 0.2 0.2 602 98 777067 THB-86 12-'4-87 7.6 67 24 361 4.7 0.54 0.54 536 34 0 309 0.8 0.1 1,254 266 825947 THB-87 12-15-87 7.7 904 1,100 8,506 147 1.7 0.12 16.100 1,740 0 18 0.0 0.2 33,960 6,780 906949 08-11-89 1.7 952 1,300 7,960 145 3.7 0.10 16,300 2,200 0 34 0.0 0.1 35.100 7,700 THB-88 12-16-87 7,,1 934 245 747 15 4.6 0.73 3,400 101 0 15 0.0 0.0 8.484 3,340 673085 11-11-89 7..3 1,320 310 943 27 16 4.30 4,380 294 0 28 0.2 0.1 8.010 4.560 THB-89 12-17-87 7.3 80 40 200 11 7.5 0.72 428 9.1 0 237 0.0 0.0 1.112 363 643112 THB-90 12-19-87 7,.0 1 ,704 693 3.012 27 15 18 8,460 780 0 136 0.0 0.0 18,674 7,100 636058 THB-91 12-21-87 7..1 960 504 2,437 23 19 4.6 6,310 458 0 110 0.0 0.0 16,090 4,470 539072 08-17-89 7.,6 1 ,080 468 2,140 27 2.7 0.12 6,140 572 0 18 0.0 0.1 14,100 4,630 THB-92 12-24-87 7.,4 111 48 317 7.0 6.5 1.3 700 6.4 0 197 1.3 0.0 1,590 474 660007 THB-93 12-26-87 8.8 176 24 294 9.0 0.94 0.01 766 0 2 10 0.0 0.0 1,688 536 801199 08-04-89 8.,1 43 7.5 106 2.3 0.94 0.00 5.6 18 0 416 1.1 0.2 419 138 THB-94 12-27-87 7.8 801199 31 18 115 6.3 0.84 0 43 18 0 398 0.3 0.2 456 150 THB-95 12-29-87 8.8 704091 6.7 11 147 6.6 0.26 0.01 140 3.7 22 184 0.0 0.0 448 60 THB-96 12-30-87 8.1 564218 15 48 448 7.0 0.82 0.10 698 0 0 263 0.0 0.0 1,436 236 THB-97 01-12-88 7.5 632696 62 17 182 3.1 1.1 0 153 70 0 407 0.4 0.2 712 223 THB-98 01-13-88 7.4 736641 32 9.3 145 1.2 0.14 0 11 36 0 467 0.1 0.2 496 117 THB-99 01-14-88 7.6 702457 30 8.6 149 1.6 0.18 0 23 17 0 484 0.3 0.2 496 111 THB-100 01-15-88 7.5 204007 34 10 62 4.7 0.28 0 20 47 0 247 0.3 0.8 312 129 THB-101 01-16-88 7.3 538388 74 16 163 5.5 5.9 0.04 244 5.1 0 338 0.6 0.2 772 253 THB-102 01-21-88 7.5 425454 30 6.4 129 2.3 1.1 0.01 16 32 0 417 0.5 0.3 450 101 THB-103 02-03-88 7.7 501160 32 9.8 154 2.7 0.08 0 55 36 0 412 0.7 0.0 490 120 45

TABLE 1. (CONTINUE)

CODE SAMPLING HARDNESS HC0 N0 DISSOLVED AS DATE PH Ca Hg Na K Fe Mn Cl S01 co3 3 3 F CO- (DD-HH-YY) SOLIDS CaCO3 ORD F HATE (TOTAL)

THB-104 02-04-88 7.6 32 3.4 90 3.1 0.14 0 14 10 0 340 0.8 0.0 360 115 594277 THB-105 02-04-88 7.7 28 12 147 1.6 0 0.11 26 76 0 380 0.3 0.0 512 120 206005 THB-106 02-06-88 7.5 50 24 41 7.4 0.04 0.0 72 13 0 262 0.0 1.0 358 224 508062 THB-107 08-21-89 6.9 1,170 1,140 6.790 192 • 39 7.1 15,600 308 0 376 0.0 0.5 25,900 7,620 THB-108 08-31-89 8.4 11 23 108 3.9 0.32 0.06 58 2.2 28 272 0.0 1.0 424 124 THB-109 08-31-89 8.6 9.1 21 92 5.1 13 0.01 67 2.5 35 184 0.0 0.9 383 108 THB-110 08-31-89 7.8 82 37 92 4.7 2.2 0.39 171 6.1 0 358 0.6 0.6 692 355 THB-111 08-31-89 9.5 4.6 6.7 92 4.3 0.20 0.00 60 1.9 35 102 0.0 0.8 303 39 THB-112 08-25-89 9.2 7.7 8.0 44 4.7 0.52 0.00 14 2.4 20 114 0.0 0.6 189 52 THB-113 08-31-89 8.1 40 36 101 4.7 0.74 0.17 146 2.4 0 311 0.2 0.8 591 248 THS-1 02-05-88 7.5 32 18 129 8.6 0.64 0 143 32 0 148 5.9 0.2 422 152 622191 THS-2 02-03-88 7.7 32 10 18 3.5 0.56 0.04 17 13 0 147 0.5 0.2 194 122 663421 THS-3 02-05-88 7.1 240 924 5,934 226 3.00 0.03 10,840 1,775 0 153 4.5 0.9 24,184 4,400 729038 THS-4 08-07-89 7.4 172 372 2,970 125 1.30 0.02 5,530 839 0 138 7.6 0.4 13 ,830 1,960 THS-5 08-07-89 7.5 440 1,070 7,080 274 0.74 0.05 13,800 2,080 0 135 3.9 0.5 30 ,700 5,500 TH5-6 08-07-89 7.7 376 1.450 7,910 317 0.74 0.05 14,800 2.240 0 135 1.9 0.5 32 ,900 6,900 TKS-7 09-04-89 7.3 42 42 177 11 3.50 0.01 287 94 0 137 5.3 0.3 847 277 THS-8 09-04-89 7.3 33 8.4 18 4.3 0.84 0.00 16 34 0 124 1.9 0.2 204 117 TABLE 2. CHEMICAL ANALYSIS OF WATER SAMPLES (MG/L) FROM SELECTED WELLS FOR ISOTOPES STUDY IN UPPER CHAO PHRAYA BASIN.

CODE SAMPLING HARDNESS

Na K Fe Cl CO HC0 N0 F DISSOIVEC) AS DATE PH Ca Mg Mn S04 3 3 3 CO- (DD-MM-YY) SOLIDS CaCO3 ORDINATE (TOTAL)

THN-01 01-19-88 6.1 71 50 30 1.2 0.22 0.37 12 6.0 0 516 0.0 0.2 502 384 685H1 THN-02 01-17-88 6.3 53 33 16 0.8 0.42 0.10 1.2 4.0 0 368 0.0 0.2 370 269 018435 THN-03 12-24-87 6.5 14 1.8 25 3.5 2.9 1.20 4.0 3.2 0 107 0.0 0.2 172 41 836127 THN-04 01-22-88 6.2 26 7.3 25 3.9. 12 0.46 37 12 0 103 0.0 0.3 196 95 342822 THN-05 01-22-88 6.5 48 6.2 5.1 2.7 18 1.00 74 10 0 169 0.0 0.2 286 145 842569 THN-07 12-18-87 6.3 280 48 487 7.8 27 1.2 1.310 3.8 0 171 0.2 0.2 3.110 896 156348 THN-08 01-16-88 6.6 44 16 18 1.6 4.3 2.6 6.8 11 0 231 1.1 0.2 256 177 104519 THN-09 01-13-88 6.6 84 20 308 1.6 2.5 0.50 498 13 0 295 0.6 0.2 1.170 290 432538 THN-10 01-23-88 6.7 97 17 48 1.6 13 0.50 38 35 0 406 0.0 0.1 454 314 927869 THN-11 12-23-88 7.0 13 3.3 9.2 1.6 4.4 0.13 2.0 3.5 0 72 1.0 0.5 94 45 517207 THN-12 12-19-87 7.3 10 0.9 122 1,.6 1.9 0.00 3.2 3.8 0 358 2.0 1.9 340 29 823370 THN-13 01-15-88 7.0 38 7.0 106 0.4 0.81 0.00 113 4.5 0 240 0.3 0,.2 142 126 518887 THN-14 01-17-88 6.9 70 19 85 1,.2 9.4 0.00 68 54 0 426 1.3 0..2 562 2F2 807350 THN-15 12-26-87 7.2 7.7 5.7 32 0..8 9.5 0.29 17 3.5 0 107 0.2 0..1 142 43 356633 THN-16 01-19-88 7.0 35 5.9 30 2..3 8.1 0.57 13 13 0 177 1.0 0.1 212 112 896129 THN-17 01-22-88 7.0 61 0.0 182 0.4 28 0.00 44 50 0 530 0.4 0.3 716 153 818809 THN-18 01-21-88 6.9 122 9.7 55 2. 3 1.6 0.00 22 21 0 503 16 0.2 514 343 535843 THN-19 01-15-88 7.1 28 3.2 9.2 3.6 5.4 0.10 2.0 4.0 0 120 2.7 0.2 120 83 396959 THN-20 12-24-87 7.2 6.9 2.9 ?1 3.1 1.0 0.00 1.2 3.5 0 91 0.0 0.3 124 29 965194 THN-2Z 01-14-88 7.1 30 2.7 62 2. 7 1.1 0.00 40 3.8 0 206 1.7 0.5 254 87 352793 THN-23 01-18-88 6.7 62 1.9 23 0.8 13 0.15 12 11 0 228 0.6 0.1 220 164 216301 THN-24 01-14-88 6.9 46 10 62 0.8 0.05 0.00 6.8 27 0 317 1.7 0.3 388 157 645716 THN-25 01-14-88 7.1 33 2.4 48 2. 3 7.5 0.00 0.0 4.5 0 239 0.4 0.9 224 91 287873 47

TABLE 2. (CONTINUE)

CODE SAMPLING HARDNESS Na K Fe Mn Cl SO, ( NO F DISSOLVED AS DATE PH Ca Mg X ;o3 HCO, 3 CO- (DD-MH-YY) SOLIDS CaC03 ORDINATE (TOTAL)

TIIH-26 01-19-88 6.9 28 7.2 16 2.3 5.3 0.08 0.0 5.0 0 158 0.0 0.1 154 100 052183 THN-27 12-27-87 7.0 10 4.6 32 2.7 6.7 0.50 4.0 5.0 0 125 0.8 0.2 106 44 288779 THN-28 12-25-87 6.9 13 2.5 16 3.1 11 0.25 4.0 6.0 0 82 1.0 0.1 102 44 381169 THN-29 01-22-88 7.0 8.5 3.3 99 1.2. 0.19 0.11 2.0 13 0 279 0.5 1.7 300 35 841570 THN-30 12-23-87 6.7 34 3.7 9.2 3.1 6.2 0.66 4.0 4.5 0 139 0.6 0.3 140 100 667195 THN-31 12-24-87 6.8 8.0 4.4 55 2.0 0.30 0.27 0.4 4.0 0 183 0.5 1.6 174 38 199233 THN-32 01-20-88 6.7 24 10 55 1.6 1.2 0.56 6.0 4.5 0 252 1.5 0.5 256 102 908948 THN-33 01-21-88 6.7 42 9.4 25 2.7 52 0.16 3.6 8.5 0 205 0.4 0.1 216 144 631807 THN-34 12-18-87 6.6 49 5.6 78 3.5 9.9 1.80 102 5.0 0 217 0.0 0.4 388 145 064485 THN-35 01-19-88 6.6 46 6.4 16 7.8 21 0.46 7.6 6.5 0 200 3.0 0.3 232 142 825135 THH-36 12-27-87 6.9 16 6.4 62 1.2 0.23 0.16 4.0 3.8 0 234 1.2 0.4 246 67 037809 THN-37 12-24-87 6.9 7.2 3.1 48 1.2 0.16 0.15 0.4 0.0 0 164 0.6 0.9 190 31 122305 THN-38 12-24-87 6.5 23 4.3 57 9,4 0.68 0.16 1.2 0.0 0 212 0,.6 1..2 228 74 061239 THN-39 12-22-87 6.9 62 12 55 1..2 0.14 0,.02 1,.2 3.8 0 406 0..1 0..2 394 203 808718 THN-40 01-14-88 7.6 16 2.5 126 1.,6 0.38 0,.00 91 0.0 0 236 1..6 1.,2 366 51 203801 THN-41 12-24-87 7.5 25 3.5 11 3.1 6.7 0.17 0.,4 0.0 0 116 2..3 0.1 120 76 289253 THN-42 12-26-87 7.2 49 3.4 2.3 0.8 7.0 0.35 1.2 0.0 0 168 0.1 0.2 142 135 437598 THN-43 12-22-87 7.1 41 10 71 6.6 0.12 0.02 2.0 3.5 0 372 0.0 0.3 374 145 776861 THH-44 12-22-87 7.2 38 13 87 6.2 0.18 0.05 2.0 3.8 0 429 0.4 0.3 406 151 825661 THN-45 12-25-87 7.5 4.0 3.9 53 2.3 1.4 0.12 23 3.2 0 131 0.5 0.5 152 26 479263 THH-46 01-15-88 7.3 42 5.5 18 2.0 4,. 2 0.27 18 0.0 0 173 0.8 0.3 202 127 365033 THN-47 12-26-87 7.2 7.2 6.0 25 4.7 7.2 0.26 11 0.0 0 107 2.2 0.2 120 43 352511 TABLE 3. CHEMICAL ANALYSIS OF WATER SAMPLES (MG/L) FROM SELECTED WELLS FOR ISOTOPES STUDY IN HAT YAI BASIN.

CODE SAMPLING HARDNESS DISSOLVED AS DATE PH Ca Mg Na K Fe Hn Cl S0 CO3HC03 NO, F CO- (OD-MM-YY) 50LIDS ( ORDINATE (TOTAL)

THY-01 05-05-88 7.6 27 19 41 6.6 14 0.26 18 5.0 0 260 0.4 1.0 275 144 THY-O2 05-06-88 7.7 6.4 2.9 2.3 3.1 11 0.10 6.4 5.0 0 35 0.0 0.1 45 28 05-09-89 7.8 3.8 3.0 2.3 3.1 13 0.04 3.6 3.0 0 34 0.7 0.1 47 22 THY-O3 05-05-88 7.1 67 6.9 6.9 13 9.9 0.01 8 .0 6.3 0 261 0.4 0.6 234 196 THY-04 05-06-88 7.7 1.6 2.9 12 4.7 7.9 0.11 12 6.0 0 37 0.0 0.0 66 16 05-06-89 7.4 2.2 3.5 12 3.9 7.6 0.06 14 5.9 0 37 0.4 0.1 83 20 THY-05 05-05-88 7.1 9.6 3.6 0.0 0.8 . 0.36 0.10 8.0 5.0 0 49 2.4 0.0 57 39 05-06-8S 7.0 0.0 1.2 0.0 0.4 0.36 0.03 2.8 2.8 0 8 2.3 0.0 16 6 THY-06 05-05-88 7.3 0.0 0.0 0.0 0.4 13 0.08 4.0 5.0 0 11 0.0 0.0 14 0 05-06-89 7.6 4.5 1.2 0.0 0.0 21 0.12 5.2 3.0 0 20 0.0 0.0 29 16 THY-O7 05-05-88 6.7 72 28 2.3 3.1 0.50 0.04 7.2 4.5 0 365 0.0 0.1 314 296 05-06-89 7.6 66 14 2.3 2.7 0.26 0.04 6.8 4.2 0 328 0.0 0.2 354 274 THY-O8 05-05-88 7:<\ 1.4 2.0 2.3 5.9 0.58 0.13 4.8 4.5 0 27 0.5 0.0 26 12 05-06-89 7.4 22 1.5 2.3 5.5 1.1 0.10 5.6 3.2 0 79 1.5 0.1 102 61 THY-09 05-05-88 7.0 6.9 2,.9 6.9 4.7 0.10 0.11 16 4.5 0 34 0.0 0.0 56 29 05-06-89 7.B 23 1.4 9.2 5.1 0.36 0.01 23 3.2 0 72 0.1 0.1 132 63 THY-1O 05-05-88 6.7 75 25 2.3 8,.2 1.7 0.32 8.0 4.5 0 333 0.0 0.1 280 290 05-06-89 7.3 78 19 2.3 8.,6 1.3 0.15 6.8 4,.4 0 333 0.0 0.3 352 273 THY-11 05-05-88 7.2 2,.7 0,,3 2.3 1,.2 12 0.16 4,.8 4.5 0 12 0.0 0.0 26 8 05-06-89 7.8 16 1.0 2.3 1.,2 16 0.00 5,.2 3,.2 0 54 1.1 0.0 72 47 THY-12 05-05-88 7,.0 50 27 2.3 8.,2 7.6 0.01 4,.8 4,.5 0 298 0.0 0.1 240 234 05-07-89 7,.5 49 25 2.3 8.,2 9.4 0 .00 3..2 3,.7 0 284 0.0 0.2 296 227 THY-13 05-05-88 7..1 59 8.6 4,.6 12 2.6 0.06 7,,2 5,.3 0 245 0.2 0.0 218 183 05-07-89 7,.7 57 8.,4 4,.6 12 2.9 0.00 5,,2 4,.2 0 229 0.0 0.2 252 177 THY-14 05-05-88 7.,3 19 2.0 2,.3 16 1,.9 0,.23 8.,0 11 0 88 0.0 0 .6 94 56 05-06-89 7.,5 15 3.8 0,.0 16 1,.6 0,.28 4..8 9.,2 0 71 0.0 0.7 109 53 THY-15 05-06-88 7,.4 1.3 3.5 16 3.5 9,.4 0.,09 17 4.,8 0 40 0,.0 0,.1 74 18 05-09-89 7.,7 0.0 1.6 12 3.1 16 0.,12 12 3.1 0 26 0,.0 0,.1 57 7 THY-16 05-05-88 6.,9 31 3.9 6.,9 0.4 4.,5 0.,12 9.6 4.8 0 128 0,.0 0,.0 112 93 05-07-89 7.,7 31 5.7 6.9 0.4 11 0.14 8.0 3.2 0 131 0,,0 0,,1 158 101 THY-17 05-06-88 5.5 52 27 152 12 96 2.,4 493 5.3 0 8 0,,0 0,,0 1.074 240 05-09-89 4.4 34 58 184 13 92 2.8 559 5.7 0 3 0.,0 0.,0 1.202 239 THY-18 05-05-88 6.4 3.2 2.6 4.6 2.0 0.04 0.05 8.8 4.5 0 23 0.,0 0.0 34 19 05-06-89 5.8 1.8 2.3 4.6 2.7 0.30 0.05 8.8 3.2 0 18 0.0 0.0 37 14 THY-19 05-06-88 5.9 184 136 642 36 18 2.4 1,656 37 0 115 0.0 0.0 3.442 1 ,020 05-08-89 6.2 194 137 649 37 26 1.7 1,680 31 0 141 0.0 0.2 3.595 1 ,048 THY-2O 05-06-88 6.1 56 88 173 17 17 2.7 530 14 0 134 0.0 0.0 1,262 500 05-08-89 6.7 51 73 161 17 52 1.5 509 3.5 0 79 0.0 0.1 1,202 427 THY-21 05-06-88 6.5 86 166 472 27 5. 1 0.09 1 ,184 16 0 322 0.0 0.1 2,,746 900 05-10-89 7.4 130 160 444 26 25 0.02 1 ,218 4.4 0 340 0.0 0.2 2,,797 984 THY-22 05-06-88 7.2 21 46 209 19 22 0.04 238 5.8 0 419 0.0 0.0 736 240 05-09-89 7.8 44 40 214 20 7.0 0.00 255 4.5 0 481 0.0 0.3 1,,022 274 THY-23 05-06-88 7.0 92 32 216 26 4.6 0.30 397 20 0 308 1.8 0.4 1,018 360 05-09-89 7.6 74 23 186 24 2.6 0.31 257 24 0 371 3.6 0.4 966 281 THY-24 05-06-88 7.2 60 21 150 12 25 0.01 173 36 0 340 0.2 0. 1 604 235 05-09-89 7.8 44 13 94 8 17 0.23 103 20 0 254 0.7 0.2 511 164 49

TABLE 3. (CONTINUE)

CODE SAMPLING HARDNESS DATE pH Ca Mg m K Fe Mn Cl so* CO HCO, NO, F DISSOLVED AS J J CO- (DD-MM-YY) SOLIDS CaCOq ORDINATE (TOTAL) J

THYS-O1 05-05-88 7.0 320 988 6,394 243 0.48 0.04 11 ,660 1,744 0 96 0.2 1.0 25,248 4,860 05-09-89 7.0 224 1,108 8,395 309 20 0.08 15 ,240 2,601 0 106 0.0 0.5 35,076 5,120 THYS-O2 05-06-88 7.8 4.8 4.4 4.6 3.9 3.0 0.01 4.8 6..8 0 23 4.8 0.0 36 30 Ob-07-89 7.7 7.4 3.0 g.2 3.1 5.2 0.00 7.6 6..1 0 29 6.3 0.1 64 27 50

TABLE 4. ISOTOPIC DATA RESULTS FROM BANGKOK METROPOLITAN AREA

Samples Sampling Depth 0-18 H-2 Tritium C-13 C-14 C-14 Age Age Code date (m) (%.) (%.) (T.U.) (%.) (ppmc) Error Error

THB-1 80.2 207.0 -4.30 -32.4 -8.2 11.4 0.3 12.100 2,900 THB-2 80,2 48.5 -4.79 -34.7 1.4 THB-3 80.2 128.2 -4.66 -34.8 -8.7 8.0 0.3 15,500 2,800 THB-4 80.2 67.2 -4.26 -32.3 -9.2 10.7 0.3 13,500 2,700 THB-5 80.3 228.5 -4.13 -32.7 -8.7 6.5 0.3 17,200 2,800 THB-6 80.3 171.0 -4.25 -33.2 10.1 10.8 0.3 14,200 2,600 THB-7 80.3 172.0 -4.08 -30.5 -9.3 7.2 0.3 16,900 2,700 THB-8 80.3 103.0 -4.30 -31.9 -8.9 6.5 0.3 17,400 2,800 THB-9 80.3 111.0 -4.59 -35.3 -9.4 10.5 0.3 13,900 2,700 THB-10 80.3 -5.42 -38.6 THB-11 80.3 103.0 -6.75 -45.1 0.5 10.9 1.0 0.2 34,500 4,100 THB-I2 80.3 51.0 -6.50 -44.2 13.5 0.7 0.2 39,200 5,200 THB-21 88.1 564.5 -6.90 -52.2 10.6 3.9 0.6 31,700 6,400 THB-74 87.12 167.7 -2.45 -16.2 12.9 THB-74/2 89.8 167.7 -2.50 -19.7 0.0 13.8 THB-78 88.1 560.5 -6.90 -48.4 10.3 5.1 1.4 20,600 4,800 THB-68 88.2 172.4 -5.65 -40.8 THB-69 88.1 195.0 -5.87 -42.5 -7.6 6.3 0.7 16.300 3,800 THB-77 88.1 566.0 -7.49 -51.4 -9.5 0.5 0.9 39.000 - THB-79 87.12 193.0 -4.40 -34.5 -9.1 5.9 0.6 18,300 3,400 THB-80 87.12 134.0 -4.58 -35.0 0.0 -9.5 15.0 1.1 11,000 3,100 THB-81 87.12 87.0 -5.51 -41.6 0.0 -9.8 16.2 1.2 10,600 3,100 THB-82 87.12 190.0 -4.50 -34.7 0.0 10.8 13.8 1.3 12,700 3,200 THB-83 87.12 186.0 -5.86 -41.7 10.1 0.9 0.5 34,700 7,600 TKB-84 87.12 218.0 -4.27 -33.0 -9.0 7.4 1.0 16,400 3,700 THB-85 87.12 198.4 -5.68 -41.5 -9.4 2.3 0.5 26,400 4,400 THB-86 87.12 90.2 -4.59 -36.3 -1.2 7.0 1.4 TH8-87 87.12 143.0 -l.OS -9.6 12.1 THB-87/2 89.8 143.0 -6.31 -46.1 0.5 -9.8 THB-88 87.12 180.0 -3.99 -33.4 -8.4 ' THB-88/2 89.8 180.0 -4.18 -32.1 0.0 THB-89 87.12 85.6 -4.35 -35.1 -9.0 7.6 0.8 16,200 3,500 THB-90 87.12 152.6 -3.57 -28.5 0.0 13.7 21.4 2.5 11,000 3,100 THB-91 87.12 106.8 -4.52 -33.6 -8.2 THB-91/2 89.8 106.8 -4.70 -33.6 0.2 12.4 THB-92 87.12 100.7 -4.80 -37.4 -7.0 11.1 2.2 10,900 4,700 THB-93 87.12 132.0 -5.59 -38.5 -8.5 THB93/2 89.8 132.0 -4.65 -35.4 0.0 -9.3 7.5 0.3 16,500 2,900 THB-94 87.12 183.0 -3.32 -29.3 1.1 -8.5 36.6 0.8 2,700 2,900 THB-95 87.12 95.0 -4.37 -35.3 0.0 -5.2 18.4 0.9 4,300 4,100 THB-96 87.12 141.0 -4.14 -34.9 0.3 -2.5 12.4 0.7 1,500 7,400 THB-97 88.1 207.2 -5.25 -37.4 -8.0 5.8 0.5 17,400 3,500 THB-98 88.1 140.0 -4.98 -32.3 -6.4 5.4 0.6 16,100 4,100 THB-99 88.1 280.5 -4.08 -30,7 -9.0 11.6 0.8 12,600 3,200 THB-1OO 88.1 302.5 -6.40 -46.6 -9.9 1.8 0.5 28,800 4.800 THB-101 88.1 249.5 -5.00 -37.0 0.5 -9.4 91.5 3.3 Modern THB-102 88.1 180.0 -4.95 -41.8 -9.9 1.7 0.7 29,300 6,100 THB-103 88.2 254.5 -4.93 -38.6 THB-104 88.2 194.0 -4.56 -35.3 THB-105 88.2 243.0 -5.64 -41.4 51

TABLE 4. (CONTINUE)

Samples Sampling Depth 0-18 H-2 Tritium C-13 C-14 C-14 Age Age Code date (m) (%.) (%.) (T.U.) (%.) (ppmc) Error Error

THB-1O6 88.2 460.0 -7.11 -47.3 THB-107 89.8 96.0 -3.32 -18.1 0.5 THB-108 89.8 163.0 -6.79 -48.1 0.0 THB-109 89.8 205.0 -6.99 -50.5 0.1 THB-UO 89.8 85.0 -5.90 -41.9 0.0 THB-111 89.8 150.0 -6.69 -48.2 0.0 THB-112 89.8 213.0 -6.98 -51.1 0.2 THB-113 89.8 137.0 -1.03 -8.1 0.2 THS-1 88.2 -3.26 -31.4 5.3 THS-2 88.2 -3.65 -34.4 .'..3 THS-3 88.2 -1.21 -11.3 4.0 THS-4 89.8 -3.41 -25.5 3.2 THS-5 89.8 -1.09 -11.3 3.8 THS-6 89.8 -1.01 -9.4 3.3 THS-7 89.9 -3.91 -33.6 4.4 THS-8 89.9 -4.10 -32.9 4.8 TABLE 5. OVERALL ISOTOPIC DATA FROM UPPER CHAO PHRAYA BASIN

Samples Sampling Depth 0-18 H-2 Tritium C-13 C-14 C-14 Age Age Code date (m) (%.) (%•) (T.U.) (%.) (ppmc) Error Error

THR-1 83.3 0.0 -5.76 -41.3 THR-2 83.3 0.0 -2.33 -24.0 THR-3 83.3 0.0 -6.32 -43.1 THR-4 83.3 0.0 -5.54 -36.6 THR-5 83.3 0.0 -9.20 -63.5 THN-48 88.1 0.0 -5.90 -46.1 THN-49 88.1 0.0 -6.01 -43.9 7.5 THN-50 88.1 0.0 -5.80 -41.0 6.5 THN-51 88.1 0.0 -5.42 -38.3 THN-1 83.1 19.0 -8.59 -58.4 • 1.4 17.9 71.3 1.1 Modern THN-1 88.1 19.0 -8.55 -62.0 THH-2 83.3 18.3 -7.43 -50.1 0.8 18.5 89.6 1.3 Modern THN-2 88.1 18.3 0.4 18.0 83.4 1.4 Modern THH-3 83.1 18.3 -7.50 -51.9 16.7 85.3 1.3 Modern THN-3 87.12 18.3 -7.58 -61.0 THN-4 83.3 •18.7 -6.50 -41.7 8.5 18.4 1 06.3 1.6 Modern THN-4 88.1 18.7 -6.58 -47.1 TKN-5 83.1 19.1 -6.71 -48.0 17.1 1 02.7 2.0 Modern THN-5 88.1 19.1 -6.91 -51.9 THN-6 83.3 21.3 .-6.83 -45.8 2.0 17.3 1 16.2 4.5 Modern THN-6 21.3 THN-7 83.1 45.0 -6.03 -43.2 15.4 1 17.3 1.4 Modern THN-7 88.1 45.0 -6.93 -51.0 THN-8 83.3 24.4 -6.30 -42.9 1.9 17.9 1 08.2 0.8 Modern THN-8 88.1 24.4 -6.17 -45.9 THH-9 83.3 24.9 -6.24 -44.2 0.1 14.1 70.6 0.8 Modern THN-9 88.1 24.9 -6.38 -47.5 1.3 14.6 71.6 1.2 Modern THN-1O 83.3 18.3 -6.73 -47.4 7.5 15.4 88.1 1.1 Modern THN-1O 88.1 18.3 -6.76 -46.1 THH-11 83.1 30.5 -6.85 -44.3 4.6 13.2 99.1 2.9 Modern THW-11 87.12 30.5 -7.02 THN-12 83.3 36.6 -7.67 -53.3 0.9 15.9 37.7 0.6 7,600 2,200 THH-12 87.12 36.6 -7.10 -58.2 0.0 15.6 82.1 0.6 8,800 2,200 THN-13 83.3 36.6 -6.70 -45.3 13.5 89.5 2.2 Modern THN-13 88.1 36.6 -6.87 -47.6 THN-14 83.3 42.7 -8.42 -57.8 0.5 20.9 88.9 1.1 Modern THN-14 88.1 42.7 -8.44 THN-15 83.1 39.9 -7.09 -48.7 1.6 18.4 34.6 0.5 3,500 2,100 THH-15 87.12 39.9 -7.19 -51.0 THH-16 83.1 42.7 -7.64 -53.4 1.4 17.0 90.3 0.6 Modern THN-16 88.1 42.7 -7.83 -55.9 THN-17 83.1 48.5 -6.68 -46.7 13.2 82.3 0.3 Modern THN-17 88.1 48.5 -6.75 -47.6 THN-18 83.1 48.8 -8.44 -56.0 18.9 86.7 1.1 Modern THN-18 88.1 48.8 -7.90 -57.7 THN-19 83.3 48.6 -7.05 -46.5 1.0 15.4 64.3 1.1 Modern THN-19 88.1 48.6 -7.12 -48.8 THN-20 83.1 52.4 -7.97 -56.2 1.0 14.1 48.9 1.1 4.500 2,300 THN-2O 87.12 52.4 -8.04 -59.4 THN-21 83.1 48.8 -8.01 -51.8 -5.8 53

TABLE 5. (CONTINUE)

Samples Sampling Depth 0-18 H-2 Tritium C-13 C-14 C-14 Age Age

Code date (m) (%•) (%.) (T.U.) (%.) (ppmc) Error Error

THN-21 48.8 THN-22 83.3 54.9 -6.74 -46.0 14.0 49.7 l.i 4,300 2,300 THN-22 88.1 54.9 -6.86 -50.0 TKN-23 83.3 54.9 -7.83 -53.3 18.4 1 05.0 1.1 Modern THN-23 88.1 54.9 -7.77 -56.6 THN-21 83.1 29.8 -5.88 -41.8 6.9 16.7 1 18.8 1.4 Modern THN-24 88.1 29.8 -5.89 -44.7 THN-25 83.1 58.0 -5.86 -42.8 1.4 13.7 15.7 0.5 13,600 2,400 THN-25 88.1 58.0 -6.15 -45.1 THN-26 83.3 67.7 -8.01 •1.4 17.0 72.1 0.6 Modern THN-26 88.1 67.7 -7.81 -52.7 THH-27 83.1 66.7 -7.61 -50.4 2.3 14.6 54.6 0.8 3,800 2,200 THN-27 87.12 66.7 -7.46 -50.9 THN-28 83.1 68.3 -7.21 -46.0 13.3 87.5 1.1 Modern THN-28 87.12 68.3 -7.07 -49.0 THN-29 83.1 09.7 -6.59 -47.7 0.0 17.5 2.6 0.2 36,500 2.700 THH-29 88.1 69.7 -6.96 -49.1 17.0 0 0.5 40,000 2,400 THH-30 83.3 54.9 -6.89 -46.6 13.4 96.5 2.3 Modern THN-30 87.12 54.9 -7.05 -48.6 THN-31 83.3 54.9 -6.38 -43.7 15.2 5.7 0.2 22,900 2,400 THN-31 87.12 54.9 -6.43 THN-32 83.3 63.4 -6.68 -46.6 13.9 13.2 0.4 15,200 2.400 THN-32 88.1 63.4 -7.80 -54.6 THN-33 88.3 18.3 -5.54 -42.4 7.3 14.5 88.2 1.1 Modern THN-33 88.1 18.3 -3.91 -38.8 THN-34 83.1 67.1 -7.17 -51.9 15.5 33.8 0.4 7.000 2.200 THN-34 87.12 67.1 -7.39 -52.2 THN-35 83.1 75.0 -8.54 -58.7 1.1 17.4 83.1 0.4 Modern THN-35 88.1 75.0 -8.32 -57.4 THN-36 83.3 84.2 -7.58 -51.2 15.9 . 30.6 2.8 9,300 2,900 THN-36 87.12 84.2 -7.56 -43.8 THN-37 83.3 87.6 -6.31 -42.9 15.9 12.1 0.3 17,000 2,300 THN-37 87.12 87.6 -6.22 -42.9 THN-38 83.1 97.6 -6.44 -44.7 16.4 9.9 0.3 18,900 230 THN-38 87.12 97.6 -6.47 -54.5 THN-39 83.3 119.9 -7.02 -50.4 1.1 17.3 3.0 0.3 29,200 2,900 THH-39 87.12 119.9 -7.25 -56.5 THN-4O 83.3 112.9 -6.60 -46.0 16.6 5.1 0.2 24,500 2,400 THN-40 88.1 112.9 -6.71 -59.9 THN-41 83.1 121.0 -7.49 -52.0 1.7 14.4 59.6 1.3 Modern THH-41 87.12 121.0 -7.73 -53.3 THN-42 83.3 141.0 -6.79 -46.7 17.6 71.1 0.9 Modern THN-42 87.12 141.0 -6.88 -49.7 THH-43 83.3 165.0 -6.93 -50.7 0.8 17.7 1.0 0.1 38,500 2,900 THH-43 87.12 165.0 -7.76 -63.9 18.4 0 0.5 40,000 2.300 THN-44 83.3 158.6 -7.54 -51.7 18.2 30.1 0.5 10,600 2,100 THN-44 87.12 158.6 -7.59 -53.2 THH-45 87.12 78.6 -5.89 -42.9 18.0 0.6 0.5 40,000 2,400 THN-46 88.1 101.9 -7.83 -57.1 0.2 15.0 38.5 1.2 7,000 2,400 THN-47 87.12 85.4 -7.28 -49.4 0 15.3 55.4 i.?. 4.100 2,300 THH-52 87.12 0.0 -5.61 -41.9 TABLE 6. OVERALL ISOTOPIC OATA FROM HAT-YAI BASIN

Samples Sampling Depth 0-18 H-2 Tritium C-13 C-14 C-14 Age Age Code date (m) (%.) (%•) (T.U.) (%•) (ppmc) Error Error

THYS-1 88.5 -0.06 -3.4 2.5 THYS-O1 89.5 -0.78 -7.8 2.3 THYS-2 88.5 -6.06 -37.4 2.6 THYS-02 89.5 -5.28 -32.6 2.3 THY-1 88.5 36.6 -7.21 -46.0 0.0 THY-2 88.5 100.6 -5.78 -30.6 2.8 THY-2 89.5 100.6 -3.01 -51.0 1.8 THY-3 88.5 100.6 -7.58 -48.3 0.6 THY-3 89.5 100.6 -7.75 -48.6 0.5 THY-4 88.5 42.7 -6.68 -41.7 . 1.7 THY-4 89.5 42.7 -6.86 -42.3 0.7 THY-5 88.5 30.5 -7.03 -43.3 3.8 THY-5 89.5 30.5 -6.84 -41.2 3.0 THY-6 88.5 33.5 -6.82 -43.9 2.8 THY-6 89.5 33.5 -6.86 -42.5 3.1 THY-7 88.5 •24.4 -7.36 -«6.6 0.3 THY-7 89.5 24.4 -7.16 -46.5 0.0 15.0 52.6 1.0 4,400 2,300 THY-8 88.5 27.4 -6.97 -43.3 2.3 TIIY-8 89.5 27.4 -6.99 -44.3 2.0 THY-9 88.5 39.6 -6.17 -38.3 1.5 THY-9 89.5 39.6 -6.09 -39.1 1.2 THY-10 88.5 39.6 -7.51 -46.4 0.0 THY-10 89.5 39.6 -7.42 -48.9 0.5 14.2 32.5 0.6 7.900 2.300 THY-11 88.5 32.0 -6.32 -39.6 0.4 THY-11 89.5 32.0 -6.33 -40.0 0.4 20.3 98.2 2.7 Modern THY-12 88.5 73.2 -7.44 -47.3 0.5 THY-12 89.5 73.2 -7.36 -48.0 0.0 15.5 45.1 0.8 5,900 2,200 THY-13 88.5 51.8 -7.69 -48.3 0.4 THY-13 89.5 51.8 -7.58 -49.8 0.0 36.0 0.6 THY-14 88.5 125.0 -8.10 -50.7 0.2 THY-14 89.5 125.0 -8.14 -52.5 0.1 -9.6 36.5 1.0 3,700 2.700 THY-15 88.5 33.5 -6.83 -43.9 0.7 THY-15 89.5 33.5 -6.83 -43.8 0.1 17.3 81.0 2.3 Modern THY-16 88.5 36.6 -5.72 -35.0 3.1 THY-16 89.5 36.6 -6.31 -41.4 2.9 THY-17 88.5 62.5 -7.20 -47.1 0.4 THY-17 89.5 62.5 -7.22 -48.2 0.3 14.6 27.3 0.7 9.630 2.300 THY-18 88.5 41.2 -6.38 -39.6 0.7 THY-18 89.5 41.2 -6.46 -41.4 1.4 THY-19 88.5 115.8 -7.13 -45.6 0.3 THY-19 89.5 115.8 -6.98 -46.5 0.3 -9.2 22.7 0.8 7,300 2,900 THY-20 88.5 73.2 -7.20 -47.2 0.3 THY-20 89.5 73.2 -7.19 -48.3 0.7 13.1 23.4 0.6 9,900 2,400 THY-21 88.5 48.9 -7.21 -47.0 0.6 THY-21 89.5 48.9 -7.17 -47.8 0.0 -6.2 4.9 0.3 16,700 3,600 THY-22 88.5 85.4 -7.76 -51.2 0.1 THY-22 89.5 85.4 -7.71 -52.6 0.0 -6.3 0.7 0.4 33,000 0,100 THY-23 88.5 73.2 -7.52 -50.6 0.0 THY-23 89.5 73.2 -7.80 -51.8 0.0 -7.4 0.1 0.4 40,000 9.800 THY-24 88.5 109.8 -6.90 -44.8 1.1 THY-24 89.5 109.8 -6.86 -45.1 2.3 Annex 55

Annex 1. HELL LOCATION AND DETiALS iN BANGKOK METROPOLITAN AREA FOR ENVIRONMENTAL ISOTOPES STUDY.

|THB-01 |BANGKOK |WAT WERU WANARAM |204.00-210.00| 210.00 X | X 121/02/801 |NB 3 j BANG KHEN I I I I I NB 800 |THB-02 |PATHUM THANI|THAI-GERMAN AGR.TR. 37.00- 60.00| 60.00 X 121/02/801 | |HUANG j WELL* 6 I BK 10,000

|THB-03 (BANGKOK (HAT SIRI PONG |125.00-131.00| 131.00 (21/02/80| | jBANG KHEN (THAHNIHIT I I I I I I I I NL 700

|THB-04 |BANGKOK |HAT TEP NARI | 61.00- 73.00| 73.00 |28/02/80| | |BANGKOK NOI |(MWA) I I I I I I I I I I ( PD | 1,120 |THB-05 (BANGKOK (SOI S00NV1JAI-4. |213.00-223.00| 254.00 |04/03/80| | |BANG KAPI |WELL# 2 (MWA) (234.00-244.00j

450

|THB-08 |SAMUT PRAKAN|WAT KLANG WORA WIHAN 97.0O-109.00| 109.00 |05/03/80| | JMUANG I(MWA) I I PD I 950

Annex 1. (CONTINUE)

x |THB-11 |CHACHOENGSAO|THAI-PRAWN FARM CO. |100.00-106.00| 106.00 1 * 1 1 X | X |07/03/80| | |BANG HAM | 1 1 1 1 1 | |PRIEO | 1 1 1 1 1 1 1 1 | NL | 2,100 1 1 1

|THB-12 |CHACHOENGSAO|THAI-PRAWN FARM CO. | 46.00- 55.00| 55.00 I X 1 x 1 x | |07/03/80) | |BANG NAM | 1 1 1 1 1 | |PRIEO | 1 1 1 1 1 1 ' 1 ! | PD | 2,350 1 1 1

|THB-13 |PHRA NAKHON |HAT RUA KHAEHG 1U5.00-111.00| 111.00 1 * 1 X 1 x | |18/03/80| |HN3PSA2 |SI AYUTTHAYA| 1 1 1 1 1 | |NAKHON LUANG| 1 1 1 1 1 1 1 NL | 800 1 1 1

|THB-14 |SING BURI |MAHARAJ IRRIG. PROJECT 45.00- 51.00| 51.00 1 X 1 x 1 x | X |18/03/80| |S13SB2 |HUANG | 1 1 1 1 1 1 1 1 1 1 1 1 1 1 PD | 800 1 1 1

|THB-15 |S!NG BURI |BOROMMATHAT IRRIG. 60.00- 87.00| 102.00 1 x x 1 x | X |19/03/80| |S12SB1 |M'JANG |PROJ. SECT. 2 96.00-102.00| 1 1 1 1 1 1 1 1 1 1 1 1 1 NL | 620 1 1

[THB-16 |PHRA NAKHOH |AYUTTHAYA HOSPITAL 109.00-115.001 115.00 X X X |19/03/80| |MN2PSA1 |SI AYUTTHAYAJ 1 1 1 | |HUANG | 1 1 1 1 1 1 PD | 700 1 1

|THB-17 |RAT BURI |SIAM KRAFT PAPER CO., 118.20-130.201 130.00 X X X X |22/O3/80| | |BAN PONG HELL* 2 1 1 1 III 1 1 1 1 III 1 NB | 320 1 1

|THB-18 |RAT BURI |SIAM KRAFT PAPER CO., j 66.60- 72.60| 86.00 X X X |22/03/80l | |BAN PONG |WELL# 4 | 82.80- 85.80| III 1 1 III 1 NL | 325

|THB-19 |RAT BURI |HAT MAB KHAE | 30.00- 36.00| 36.00 X | X | x 1 X |23/O3/8O| |MO41RB2 [BAN PONG | | 1 - 1 III 1 1 " 1 III 1 PD | 1,120 |

|THB-20 |SAHUT SAKHON|HAT DON KAIDEE SCHOOL | 56.00- 72.00| 72.00 | X | X | X | |23/03/80| |MD87SSN1 JKRATHUM BAEN| | 1 - 1 1 1 III 1 1 - 1 1 1 III 1 PD | 940 | 1 1 57

Annex 1. (CONTINUE)

| CODE 1 LOCATION | SLOTTED fWELL DEPTH (H)1 -cAMPLE TYPES |SAHPLING| 1 i | PERFORATION WATER LAVEL (H) .- .. -1 nflTF 1 1 ,---—. 1 1 (M) TEMPERATURE (C)1 1 1 1 1 1 1 1 | DETAILS | AQUIFER CONDUCTANCE |0-18|H-2|C-14|H-3| | | AGENCY | PROVINCE | TAPPED (Micro MHOS/CM)| | | | |DD/MM/YY| |WELL NUMBER| DISTRICT 1 |THB-21 |SAMUT PRAKAN|FIRESTONE CO.. PU CHAO[553.00-576.00 576.00 1 x 1 *j X | |28/04/81| x x 1 |PHRA PRA- JSAHING PHRAI 34.00 1 1 ! x | X |19/01/88| 1 |DAENG | | 42.5 1 i 1 1 1 1 | PK 650 I 1 1 |THB-22 |UTHAI THANI |BAN THATHONG HEALTH | 18.30- 21.30 33.50 1 x 1x | X | |02/05/81| |MC156UTT57 |HUANG |CENTER 1 5.48 1 1 1 1 1 1 1 29.5 1 1 1 1 1 1 1 QA 220 1 1 1 |THB-23 |UTHAI THANI |BAN HAT THANONG 24.50- 30.50 33.50 1 x 1x 1 x | |02/05/81| |MC1990TT100|MUANG • |PUBLIC AREA 3.40 1 1 1 1 1 1 29.0 1 1 1 1 1 1 QA 180 1 1 1 |THB-24 [NAKHON SAWAN|SAWAN PRACHARAK 12.20- 18.30 36.60 1 x 1x 1 x | |03/05/81| |HA2NS2 |HUANG jHOSPITAL 1 1 1 1 I i i 1 i | 1 1 1 l 1 1 1 1 1 1 QA 1.900 1 1 1 |THB-25 |NAKHON SAWAN|BAN NONG KAENG 1 10.60 1 x 1x X | |03/05/81| 1 {HUANG |(DUG WELL) 1 3.10 1 1 1 1 1 1 1 29.5 1 1 1 1 1 QA | 650 1 1

|THB-26 |NAKHON SAWAN|KROK PHRA WITHAYA 10.00- 11.80| 15.00 X X X 103/05/81| IP2332 |KROK PHRA | 1 3.26 1 1 1 ( 1 1 • i 1 I 1 1 1 1 QA | 380 1 1 1 1 |THB-27 |CHAI NAT |BAN OONKARUNA 30.50- 35.50| 36.00 X X X |04/05/81| |HC247CN29 |SAPPHAYA jPUBLIC AREA 1 4.18 1 1 I 1 1 1 1 30.0 1 1 1 1 1 1 QA | 250 1 1

|THB-28 (CHAT NAT {BAN NONG NANLUK | 37.00- 43.00/ 47.00 X X X |04/05/811 |P1331 JWAT SING 1 1 1 1 I 1 1 1 1 1 30.0 1 1 1 1 1 1 QA | 380 | 1 1

|THB-29 |CHAI NAT |HAT SONG KOB SCHOOL | 50.00- 56.00| 60.00 | X X | x 1 (04/05/81| |P1078 |MUANG 1 1 1 1 1 ! 1 1 1 1 29.5 | 1 1 1 1 1 1 QA | 260 j 1 1

| THB-30 |CHAI NAT |WAT KAMPHAENG | 30.50- 36.60| 50.30 | X | X | |05/05/81| JMC39CN7 |SANKABURI 1 I 42.70- 48.80| 2.64 | 1 1 1 1 1 1 1 29.5 | 1 1 1 1 1 1 QA | 390 | 1 1 58

Annex 1. (CONTINUE)

| CODE | LOCATION | SLOTTED |WELL DEPTH (H)| SAMPLE TYPES |SAMPLING 1 | j PERFORATION | WATER LAVEL (M)| | DATE 1 | 1 1 1 | (M) j TEMPERATURE (C)| | | | j | AGENCY | PROVINCE | DETAILS j AQUIFER (CONDUCTANCE |0-18|H-2|C-14|H-3| (WELL NUHBERJ DISTRICT | | TAPPED | (Micro MHOS/CM)| | | j |DD/MM/YY |THB-31 |CHAI NAT |WAT PHOTARAH | 36.60- 42.70| 44.20 1 X 1 x | |05/05/81| |HC40CN8 ISANKABURI | 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 | qA | 245 1 1 1 |THB-32 |CHAI NAT |BAN KHUNG TAN | 15.00- 21.00| 24.00 1 x 1 x | |05/05/81| |HCZ54CN27 |SAPPHAYA | | | 4.95 1 1 1 1 1 1 j j 30.0 1 1 1 1 1 1 j LT | 700 1 1 1 |THB-33 |CHAI NAT |CHAI NAT WHISKY | | 48.80 1 X 1 x | |06/05/81| | |MUANG • |FACTORY 1 1 1 1 1 1 1 1 | | 30.0 1 1 1 1 1 1 [ QA j 180 1 1 1 |TH8-34 |CHAI NAT |WAT BAN HAD A-SA 37.00- 43.00| 45.00 1 X 1 x | |06/05/81| |P1281 JSAPPHAYA j | 7.30 1 1 1 1 1 1 1 1 1 1 1 1 1 QA | 310 1 1 1 |THB-35 |SING BURI |WAT KAHPHAENG 36.50- 42.50| 46.00 ! x 1 x | |06/05/81| |P1175 |(N BURI | | 7.43 1 1 1 1 1 | 30.0 1 1 1 1 1 QA j 160 1 1

|THB-36 |SING BURI |WAT SAO SING 19.00- 25.00| 28.50 X X |07/05/81| |P2042 jIN BURI | 1 1 1 1 1 1 | 30.5 1 1 1 1 1 LT | 900 1 1

|THB-37 |SING BURI |WAT KHLONG PHOSRI 30.00- 36.00| 40.00 X X |07/05/81| |P1490 |IN BURI | j 4.81 1 1 1 1 1 | 30.0 1 1 1 1 1 QA | 340 1 1

|THB-38 |SING BURI |WAT KHOI 84.00- 90.00| 94.00 X X |07/05/81| |P1483 j HUANG | I 1 1 1 1 1 1 1 | 31.0 1 1 III 1 LT j 650 1 1 |THB-39 |PHRA NAKHON |WAT KHOK CHANG |120.50-126.50| 130.00 | X | x x 1 |08/05/81| |P1351 |SI AYUTTHAYAJ | 1 7.40 | 1 1 1 |U-THAI | | | 34.0 | 1 1 III 1 NL | 800 1 1 |THB-4O |PHRA NAKHON |BAN PHRA KEAO | 72.50- 78.50| 82.00 | X | x 1 X | |09/05/81| |P1965 | SI AYUTTHAYAJ | 1 2-10 1 1 1 | JPHA CHI | j | 34.0 | 1 1 III 1 PD 1,800 | 1 1 59

Annex 1. (CONTINUE)

|THB-41 |PHRA NAKHON |WAT BOT BAN THAI | 64.00- 70.00| 73.00 1 x | X 1 x | |09/05/81 |C326PSA2l |SI AYUTTHAYA| 1 1 1 1 1 | |HAHARAT | | | 30.5 1 1 1 ! 1 1 | PD | 300 1 1 1

|THB-42 |LOP BURI [PHIBUL W1TTHAYALAI | 15.00- 21.00| 23.00 1 x 1 x | |09/05/81| (S27LB3 |MUANG |SCHOOL 1 1 2.10 1 1 1 1 1 1 1 1 1 1 1 1 1 1 | LT | 780 1 1 1

|THB-43 |LOP BURI |WAT PHAYAKARAH | 30.50- 42.60| 46.00 1 x 1 x | |10/05/81| |MC27LB36 jTHA WUNG | 1 1 1-40 1 1 1 1 1 1 1 1 1 1 1 1 1 1 | QA | 3,000 1 1 1

|THB-44 |SING BURI |WAT BOT 48.50- 54.50| 58.00 1 x 1 x | |10/05/81| | jIN BURI j 1 1 1 1 1 1 1 1 | 31.0 1 1 1 1 1 1 QA | 220 1 1 1

|THB-45 |SUPHAN BURI |HAT BAN WANG NAM YEN 165.00-183.00| 106.00 1 x X 1 x | |13/05/81| |MN14SPB10 |BANG PLAMA | 1 1 1 1 1 1 | 31.5 1 1 1 1 1 NL | 1,900 1 1

|THB-46 |SUPHAN BURI |HAT NOSUWAN 91.00-104.00| 107.00 X X X |14/05/81| |HN52SPB36 |HUANG | | 3.83 1 1 1 1 1 | 31.0 1 1 1 1 1 NL | 510 ! 1

|THB-47 |ANG THONG |AHPHOE SAM KO SHNITARY 141.00-147.001 151.00 x X X 114/05/81| |P1231 |SAM KO |DISTRICT | 3.23 1 1 III 1 | 31.5 1 1 NL 1,050

|THB-48 |SUPHAN BURI |WAT PHOSRI CHAROEN | 8.00- 11.50| x 1 X 115/05/81| |P2406 |SRI PHACHAN | | 1 2-27 1 1 III 1 | 30.5 1 1 III 1 BK | 2,200 1 1

x |THB-49 |SUPHAN BURI |SAM CHUK IRRIG. PROJ. | 21.00- 30.50| 36.60 | x 1 1 |15/05/81| |S25SPB4 |SAH CHUK | | 1 " 1 1 1 III 1 1 31.0 | 1 1 III 1 QA | 250 j 1 1

|THB-5O |SUPHAN BURI |HAT THA PAKDONSAN | 40.00- 46.00| 46.00 | x 1 x 1 |15/05/81| |MN53SPB37 |DEAH BANG | | | 3.75 j 1 1 | |NANG BUAT | j I 30.0 j 1 1 III 1 QA I 250 I 1 1 60

Annex 1. (CONTINUE)

|THB-51 (SING BURI |WAT PHOSANG KARAH | 45.50- 51.50| 55.00 I x 1 X 1 x | |16/05/81| |P277 |BANG RACHAN | | | 4.85 1 1 1 1 1 1 | | 31.0 1 1 1 1 1 1 | qA | 620 1 1 1

lTHB-52 |SING BURI |BAN PANG WITTHAYA | 66.00- 72.00| 75.00 1 x 1 x1 x | |16/05/81| |P961 |PHROH BURI |SCHOOL 1 1 1 1 1 1 1 1 | | 30.0 1 1 1 1 1 1 | PD j 800 1 1 1

ITHB-53 |NAKHON NAYOK|WAT SANTITHAH | 61.00- 73.00| 85.00 1 x 1 x1 x | 119/05/81| |X7ONN1 |ONG KHARAK |RATBAHRUNG | 73.00- 79.00| 1 1 1 1 1 1 | | 30.5 1 1 1 1 1 1 PD | 1,850 1 1 1

|THB-54 |PATHUM THANI|LAH LUK KA SCHOOL 124.00-129.00| 132.00 X 1 x1 x | |19/05/81| |P910 ' |LAH LUK KA | 1 1 1 1 1 1 1 | 31.0 1 1 1 1 1 1 NL | 1,000 1 1 1

|THB-55 |SARABURI |WAT HONG PLAKADI 12.00- 18.00| 18.00 X 1 x X | |20/05/81| IQ310SR38 |NONG KHAE | | 4.10 1 1 1 1 1 1 | 30.0 1 1 1 1 1 1 BK | 4,100 1 1

|THB-56 |SARABURI |WAT NONG BON 113.00-125.00| 125.00 X X X 120/05/81| |C316SR1 |NONG KHAE | | 2.20 1 1 1 1 1 | 30.5 1 1 1 1 1 NL | 2.000 1 1

|THB-57 ISARABUR! |NONG SAHAK HEALTH 18.00- 31.40| 31.40 X X X |20/05/81| |DMR7 |NONG KHAE |CENTER | 8.02 1 1 III 1 | 29.5 1 1 III 1 LT | 500 1 1

|THB-58 |SAHUT |MAT BAMG PRACHAN |102.80-108.80| 112.00 | X X X |21/05/81| |P125 |SONGKHRAH | | 1 - 1 1 1 | |HUANG | | | 33.0 | 1 1 III 1 NL | 1,190 | 1 1

|THB-59 |SAHUT |WAT BANG NOI | 59.50- 64.50| 73.50 | X | X | X | |21/05/81| |32-22 |SONGKHRAH |BAHG KHONTHI | 1 - 1 1 1 III 1 1 29.5 | 1 1 III 1 PD | 1,400 | 1 1

THB-60 |SAHUT SAKHON|HAT YAI BAN BO |146.00-152.00| 162.00 | X | x 1 X | |22/05/81| HD88SSN2 |HUANG | | 1 - 1 1 1 1 1 1 1 | 30.0 | 1 1 1 1 1 1 1 NL | 720 | 1 1 1 1 61

Annex 1. (CONTINUE)

|THB-62 |SAMUT SAKHON|DEPT. OF ARMY SIGNAL ,|146.00-152.00| 158.00 |22/05/81| IMX12SSN2 |KRATHUM BAEN| | | III II 36.5 II | | NL | 1,700

|THB-63 |SAMUT PRAKAN|WAT BANG PL I NOI 91.00- 97.00| 97.50 |20/O5/81| (C319SP2 |BANG BO | I I I I 31.5 PD 2,100 i

|THB-64 |CHACHOEHGSAO|HAT HUA SUAN 48.00- 53.00| 56.00 |20/05/81| |PI 171 |BANG KHLA | I I I 31.0 PD 2,900 jTHB-65 |CHACHOEHGSAO|WAT BAN KLU MON 58.00- 64.00| 70.40 120/05/811 |P1962 |BANG KHLA | 2.88 I I I I I 31.0 PD 700

|THB-69 |HONTHABURI (WAT SAI YAI (SAI NOI) |185.00-205.00| 205.00 |05/08/82| | |SAI NOI | | | - j17/01/88| III II 36.0 I I II I I NB |

|THB-70 |BANGKOK |IN FRONT OF SOI 1157.50-169.60| 219.50 |28/C//82| j |PHAYA THAI jsOONVIJAI (MWA) 1194.50-206.80j I I I I I I I 34.0 I I | NL + NB | 750 I I 62

Annex 1. (CONTINUE)

fTHB-71 IBANGKOK |MAKKASAN SRT. |124.72-134.36| 221.00 1 x | |28/07/82| | |PHAYA THAI |RESSIDENT (MWA) |173.62-185.78| 1 1 1 III II 32.5 1 1 1 II I | NB | 810 1 1 1

|THB-72 IBANGKOK |KLONG TOEI LOCK 3 ND -|115.00-131.701 243.00 1 x 1 x | |05/08/82| | |PHRA KHANONG|(MWA) j140.00-147.00| 1 1 1 III || 32.2 1 1 1 | | | | PD + NL | 730 1 1 1

|THB-74 IBANGKOK |WAT PHROMMA RANGSI |164.70-170.70| 173.00 XX X 1 x | X |06/08/82| |NL18 |BANG KHUN |KHWAENG SAMAE DAM | | 23.48 1 x | X |23/12/87|

| |THIAN | | ) 33.2 XX X | X |18/08/89) || | | NL | 29.000 1 1 1

|THB-75 INONTHABIIRI |WAT BANG PHRAEK TAI 1175.00-194.701 212.00 X X | |03/08/82| | |MUANG |(MWA) |188.90-198.70) 1 1 1 III II 35.5 1 1 1 | . | | | NL + NB | 950 1 1 1

|THB-76 |SAHUT PRAKAN|THANAKORN CO. |498.12-507.12| 528.96 X X |06/08/82| | |MUANG | 1516.12-525.1ZJ 1 1 III II 50.0 1 1 || | | PK | 750 1 1

|THB-77 |SAMUT PRAKAN|CHAO PHRAYA KIT PRA- |557.00-575.00| 575.50 X X 103/08/82| f JMUANG |MONG CO. j | - X X X X |18/01/88) III II 29-8 1 1 II 1 1 PK | 1 1 jTHB-78 |SAMUT PRAKAN|THAI CHU ROT CO. |550.00-559.00| 571.00 X X 106/08/82| j |PHRA PRA- | |562.00-571.00| X X X X 120/01/88| | |DAENG | | | 33.1 | 1 1 1 1 1 1 PK I - 1 1 1

|THB-79 IBANGKOK |DEPARTMENT OF MINERAL j190.00-196.00| 199.00 | X | x 1 x 1 X |07/12/87| |NB27 |PHAYA THAI (RESOURCES, RAMA VI | | 30.09 | 1 1 | | |ROAD, KHWAENG THUNG j | - | 1 1 | j |PHAYA THAI | NB | - | 1 1

|THB-80 IBANGKOK |OEPARTMENT OF MINERAL |131.00-137.00| 140.00 | x 1 x 1 x 1 X |07/12/87| |NL34 |PHAYA THAI {RESOURCES, RAMA VI | | 26.25 | 1 1 | | |R0AD, KHWAENG THUNG ) | - | 1 1 I | PHAYA THAI | NL | - | 1 1 63

Annex 1. (CONTINUE)

JTHB-81 |BANGK0K |DEPARTHEHT OF MINERAL 84.00- 90.00| 110.00 1 x 1 x1 x | X |08/12/87| |PD17 |PHAYA THAI |RESOURCES, RAMA VI | 22.59 1 1 1 | | |ROAD. KHWAENG THUNG 1 1 1 1 | | JPHAYA THAI PD | 1 1 1

|THB-82 IPATHUH THAN 11WAT PRAYUN TAHHARAH, • 187.00-193.00| 199.00 | X 1 x| X | X |10/12/87] |NB21 |LAM LUK KA |MU THI 4, SOI WAT PRA- | 34.60 1 1 1 | | \YUtl, PmHOHYOTHlH | 31.3 1 1 1 | | |ROAD, TAHBON KHU KHOT NB | 1 1 1

|THB-83 |BANGKOK |WAT KHU BON, (BAN KHU |183.00-189.00| 192.00 1 x 1 x1 x | X |11/12/87| |HB5 |MIN BURI |BON).KHWAENG BANG CMAN| | 39.34 1 1 1 III II 33.3 1 1 1 II 1 I NB | 1 1 1

|THB-84 |BANGKOK |PHRA KHANONG FLOOD (215.00-221.00| 224.00 1 x 1 x 1 x | X 112/12/ | |NB22 |PHRA KHANONG|CONTROL STATION. SOI | | 33.24 1 1 | j |KASEM SUWAH (77), SU- j j 1 1 | | IKHUHWIT ROAD | NB | 1 1 1

|THB-85 |SAMUT PRAKAH|WAT PHRAEK SA (BAN |195.35-201.35| 204.35 1x 1 x1 X | X |13/12/87| |NB10 |HUANG j PHRAEK SA), TAHBON | | 23.02 1 1 1 | | |PHRAEK SA | | 32.6 1 1 1 || | I NB | 1 1 1

|THB-87 |SAHUT PRAKAH|BANG PLA AERONAUTICAL |140.00-146.00| 152.00 X X X X |15/12/87| |NL1 |HUANG |TRANSHISSION STATION, | | 22.88 1 1 j | jTAHBON BANG PU MAI j | 32.2 1 1 II 1 | NL | - 1 1

|THB-88 |SAMUT PRAKAN|WAT BANG YA PHRAEK |177.00-183.00| 189.00 | x 1 X X X |16/12/87| |NB2 |PHRA PRA- | (BAN BANG YA PHRAEK), | | 28.36 | 1 1 j JDAENG |MU THI 16, TAHBON BANG| | 29.2 | 1 1 | | |YA PHRAEK | NB j - | 1

|THB-89 |SAMUT PRAKAN|WAT RUAK, TAMBON BANG | 82.60- 88.60) 97.00 | X | x 1x 1 x 17/12/87) |PD10 |PHRA PRA- JPHUNG j | 29.58 | 1 j |DAENG j j | 30.5 | 1 II 1 | PD | - | 1

1HB-90 (BANGKOK |WAT THUNG KHRU (THUNG |149.60-155.60f 158.00 |x 1 x 1 x 1 x 19/12/87| NL4 |RAT BURANA |NA RAT SATTHA THAM), j | 27.27 j 1 1 | I |BAN THUNG KHRU, MU THIj | 30.7 | 1 1 | |5, KHWAENG THUNG KHRU | NL | - | 1 1 Annex 1. (CONTINUE)

|THB-91 |BANGKOK |WAT SAKAE NGAM (BAN 103 .80-109.80| 112.80 x x x | X (21/12/871 1 1 x 1 |PD9 |BANG KHUN |SAKAE NGAM). MU THI 1, 1 22.83 1 x 1 1 x | X |17/08/89| 1 [THIAN |KHWAEHG SAMAE DAM 1 31.0 1 1 1 1 1 1 PD 1 1 1 1 |THB-9Z |SAMUT PRAKAN|WAT KHU SANG (RAT SAT- 97 .00-103.70| 105.20 1 x 1 x 1 x | X |24/12/871 |PD1 |MUANG |THA THAM), BAH KHU 1 26.08 1 1 1 1 | |SANG, MU THI 3 1 32.5 1 1 1 1 1 1 PD 1 1 1 1 |THB-93 |BANGKOK |BANGKOK GOLF COURSE. 129 .00-135.00| 138.00 x 1 x x | X |26/12/87| 1 1 x |NL11 |BANG KAPI JKHWAENG HUA MAK 1 23.32 1 x 1 x 1 j X |04/08/89| 1 1 1 1 31.4 1 1 1 1 1 1 NL 1 1 1 1 |THB-94 |BANGKOK |BANGKOK GOLF COURSE, 180 .00-186 001 189.00 1 x 1 x 1 x | X |27/12/87| | NB8 |BANG KAPI |KHWAENG HUA MAK 1 45.84 1 1 1 1 1 1 1 i 31.3 1 1 1 1 1 1 1 NB 1 1 1 1 |THB-95 |SAMUT PRAKAN|PIG QUARANTINE STATION| 92 00- 98 001 104.00 X 1 x 1 x | X |29/12/87| |PD16 |PHRA PRA- |PU CHAO SAMING PHRAI | 1 34.42 1 1 1 1 |DAENG |ROAD, TAMBON SAMRONG | 1 31.1 1 1 1 1 1 ITAI | PD 1 1 1 1 |THB-96 |SAMOT PRAKAN|PIG QUARANTINE STATI0N|138 00-144.001 148.00 X X X | X |30/12/87| |NLZ7 |PHRA PRA- |PU CHAO SAMING PHRAI | 1 35.24 1 1 1 1 |DAENG |ROAD. TAMBON SAMRONG | 1 30.9 1 1 1 1 ITAI | NL 1 1 1

|THB-98 |PHRA NAKHON [PHRA INTHARACHA |134.00-146.001 152.00 X X X X |13/01/88| |MN117 |SI AYUTTHAYA|SANITARY DISTRICT 1 1 17.70 | 1 1 1 (BANG PA-IN | | 1 33.0 j 1 1 1 1 1 1 NL 1 1 1

|THB-99 |PATHUM THANI|EGAT'S RANGSIT |276.00-285.001 291.00 | X | X | X | X |14/01/88| |l-50823-026|MUANG |SUBSTATION, BANG PHUN | 1 20.75 | 1 1 III 1 1 34.6 | 1 1 III 1 PTY 1 1 1 |THB-1OO |PATHUM THANI|SAHA SAPSIN INDUSTRIAL)298.00-307.301 307.00 | x 1 x 1 X | X |15/01/88| (204-007 |LAT LUM KAEO|CO.,T. RU BANG LUANG | 1 22 | 1 1 1 1 1 1 1 30.9 | 1 1 1 1 1 1 TB 1 1 1 65

Annex 1. (CONTINUE)

|THB-1O1 jNoNTKABURl jBAKG BUA THONG (243.00-256.001 256.00 1 x | X |16/01/88| |MWA |BANG BUA |SANITARY DISTRICT 1 1 1 1 1 | |THONG | | | 30.2 1 1 1 1 1 1 | NB | 1 1 1 |THB-1O2 |SAMUT PRAKAN|BANG PHLI YAI NAI .| 164.00-170.001 196.00 1 x 1 x 1 x | X |21/01/88| |MWA |BANG PHLI |SANITARY DISTRICT 1179.00-191.001 1 1 1 III II 37.6 1 1 1 II 1 1 NB ( 1 1 1

|THB-103 INONTHABURI |WINER TEXTILE CO. |251.00-258.00| 258.00 1 x | X |03/02/88| |501-160 |PAK KRET | | | 36 1 1 1 III II 35.6 1 1 1 II 1 1 SK | r 1 1 1 |THB-104 INONTHABURI |WAT OI-CHANG |191.00-197.OO| 202.00 1 x | X |04/02/88| (PWA |BANG KRUAI | j | 1 1 1 III II 31.8 1 1 1 II 1 1 NB | 1 1 1

|THB-105 |BANGK0K |SAHAFARM CO., PRACHA |240.00-246.00| 246.00 X 1 x X |04/02/88| J206-005 |MIN BURI |RUAM CHAI ROAD 1 1 15 1 1 1 1 1 | | 35.8 1 1 1 1 1 1 | SK | 1 1

|THB-106 |BANGKOK |KRIANG KRAI HOUSING 454.00-466.001 466.00 x X X |06/02/88| jl-50825-003|BANG KHUN |ESTATE, KM 13 THON | 16 1 1 | |THAIN |BURI- PAK THO HIGHHAY | 37.7 1 1 1 1 1 PK | 1 1

|THB-107 |SAMUT SAKHON|SAMUT SAKHON 93.00- 99.00| 102.00 X X X 121/08/89| |PD19 JMUANG (PROVINCIAL HALL | 24.73 I 1 1 1 1 1 1 1 1 1 1 PD | 1 1

ITHB-108 |SAMUT SAKHON|SAMUT SAKHON 160.00-166.001 169.00 X X X |31/08/89| |NL33 |MUANG (PROVINCIAL HALL | 58.20 1 1 1 1 1 1 1 1 1 1 1 NL | - | 1 1

|THB-109 |SAMUT SAKHON|SAMUT SAKHON 202.00-208.00| 211.00 | X | x X |31/08/89| |NB26 HUANG (PROVINCIAL HALL | 46.98 | 1 III 1 1 - 1 1 III 1 NB | | 1

|THB-110 |SAMUT SAKHON|WAT NANG SAO | 83.00- 89.00| 92.00 | X | x 31/08/89| x |PD18 |KRATHUM BAEN| | 25.89 | 1 1 III 1 1 - 1 1 III 1 PD | - | 1 56

Annex 1. (CONTINUE)

x ITHB-1U | SAMUT SAKHON|HAT NANG SAO 147.00-153.00 | 156.00 1 1 x | X |31/08/89| |NL32 | KRATHUH BAEN| | 48.45 1 1 1 1 1 1 1 1 1 1 1 1 NL 1 1 1

x |THB-112 |SAMUT SAKHON|WAT NANG SAO 210.00-216.00 | 219.00 1 1 X | X |25/08/891 |NB25 |KRATHUM BAEN| | 35.09 1 1 1 1 1 1 1 1 1 1 1 1 NB 1 1 1

x |THB-113 |SAMUT SAKHON|WAT BANG PING 134.00-140.00 | 146.00 | X 1 | X |31/08/89| |NL24 | • | | 37.32 1 1 1 1 1 1 1 1 1 1 1 1 NL 1 1 1

|THS-3(87) |SAMUT PRAKAN|CHAO PHRAYA RIVF" X X X |05/02/88| | | |IN FRONT OF SAMUT | 1 1 | | |PRAKAN PROVINCIAL HALL] 29.0 1 1 III 1 1 1

|THS-5 |SAMUT PRAKAN|MOUNT OF CHAO PHRAYA | X X X 107/08/89| | j |RIVER, 5 KM. FROM POM | 1 1 j j |PRACHUN NAVY BASE | 1 1 III 1 1 1

|THS-6 |SAMUT PRAKAH|MOUNT OF CHAO PHRAYA | X | X | X |07/08/89| | | |RIVER. 10 KM. FROM POM| 1 1 | | jPRACHUN NAVY BASE | | 1 1 III II 1 1

|THS-,' |SAMUT SAKHON|THA CHIN RIVER, | | X | X f X |04/09/89) | |HUANG |THA CHIN BRIDGE | 1 1 | | | (TH0NBUR1-PAKTH0 ROAD)j | 1 1 III || 1 1 67

Annex 1. (CONTINUE)

1 1 1 • i 1 1 1

|THS-1 |RATCHA BURI |MAE KLONG RIVER X X | |22/03/80| 1 1 1 - 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

|THS-2 |BANGKOK |CHAO PHRAYA RIVER X X | ll/04/80| 1 1 ' 1 1 1 1 1 1 - 1 1 1 1 1 1 1 1

|THS-3 |SAHUT SAKHONjNAKHON CHAISRI RIVER X X |22/05/81| 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

|THS-4 |CHACHOENGSAO|BANG PRAKONG RIVER X X |20/05/81| 1 1 1 - 1 1 1 1 1 1 1 III 1 1 1

(THS-5 |NAKHON SAHAN|BUNG BORAPHET X X |03/05/81| III 1 1 1 III 1 1 1 III 1 1 1

QA = FLOOD PLAIN AQUIFER LT = LOW TERRACE AQUIFER BK = BANGKOK AQUIFER PD = PHRA PRADAENG AQUIFER NL = NAKHON LUANG AQUIFER NB = NONTHABURI AQUIFER SK = SAM KHOK AQUIFER PTY = PHAYA THAI AqUIFER TB = THON BURI AQUIFER PK = PAK NAM AQUIFER 68

Annex 2. WELL LOCATION AND DETIALS IN UPPER CHAO PHRAYA BASIN FOR ENVIRONMENTAL ISOTOPES STUDY.

|THH-O1 |SUKHOTHAI |BAN THAI CNANA SUK | | 19.00 1 x 1 x 1 x I X | /01/83| | SKT30 |THUNG SALIAH|SCHOOL. MU THi 3, | | - 1 " 1 " I X i19/OI/SSi | | |TAHBON KHAO KAEO SI | | 28.67 1 1 1 | | (SOMBUN | PCHS | 780 1 1 1 |THN-02 |UTTARADIT |DAN HAE KHAH HAN PO- .( 12.20- 18.30| 18.30 1 x 1 x | X I X | /01/83| x x | HB128 jLAP LAE |LICE STATION, MU THI | | 1 1 x 1 | X 117/01/88| | ( |2. TAHBON DAN MAE KHAM| | 29.40 1 1 1 | | |HAN | Qcm | 550 1 1 1 |THN-03 (KAMPHAENG (BAN NON YANG PUBLIC | 12.20- 18.32| 21.38 1 x 1 X 1 x | X | /01/83| | KP61 |PHET • (AREA, HU THI 6. TAHBONi | 4.68 1 x 1 x | X |24/12/87| | |SAI NGAH (NON THONG | | 28.30 1 1 1 II 1 1 Qcr | 1 1 i |THN-04 IKAMPHAENG |KAMPHAENG PHET HILL ( 12.32- 18.66| 21.66 1 * | X 1 x I X | /01/83| | KP82 |PHET (TRIBE DEVELOPMENT | | 3.32 1 * 1 x | X |22/01/88j ( |KHLONG LAN jCENTER.HU THI I.TAHBON| | 27.50 1 1 1 | | |KHLONG LAN PHATTHANA | Gr | 320 1 1 1 |THN-05 IKAHPHAENG (WAT SAM PHUANG , | 13.02- 19.06| 22.16 1 x 1 x X I ( /01/83| | SKT54 |PHET |HU THI 5. TAHBON SAH | ( 3.29 ! X 1 x X (22/01/88| | |KHIR1 HAT |PHUANG | | 28.70 1 1 1 II 1 I Qcr | 1 1

|THN-06 |PH1TSANULOK | | 16.67- 23.33| 23.33 X X X X | /01/83| | |WANG THONG | | | 1 1 III II 30.00 1 1 III | | 90 1 1

|THN-07 |NAKHON SAWAN|WAT WANG PHAI SCHOOL, | 39.00- 45.00| 48.00 X X X X | /03/83| | NS172 |HUANG NAKHON|HU THI 8, TAHBON NA- | | X X X 113/01/88| I |SAWAN |KHOH SAWAN TOK j | 28.60 1 1 II 1 | QCR | 4,100 1 !

|THN-08 (UTTARADIT (BAN KHOK CHANG PUBLIC ( 18.30- 24.40| 24.40 X X X X | /03/83| | MH3 |LAP LAE |AREA, TAHBOH SI NOP- | | 2.05 X X X |16/01/88| | j JPHAMAT | | - 1 1 II 1 | QCR | - | 1 1

|THN-09 |NAKHON SAWAN|WA1 PHO NONG YAO | 21.75- 24.90( 31.05 | X | X | X | X | /03/83| j NS46 |CHUM SAENG (SCHOOL, HU THI 3, ( | 3.75 | X | X j X | X 113/01/88J [ ( ITAHBON PHAI SING | | 29.70 j 1 1 II 1 | QCP | 2.100 | 1 1 THN-10 |PHETCHABUN |THA KHAH MUNICIPALITY | 12.20- 18.30| 30.50 | X | x 1 X | X | /03/83| N90 |CHON DAEN |FIRE STATION, TAMBON | j 4.24 ( X I x I X (23/01/88| | | JCHON DAEN j j 29.00 | 1 1 1 1 1 1 | QCH ( 790 | 1 1 1 69

Annex 2. (CONTINUE)

|THN-11 IKAHPHAENG |WAT UTHUH PHON (BAN | 24.40- 30.50| 30.50 1 x 1 x 1 x I X | /01/83| | HQ58 jpHET |THA DUA), MU THI 1, | | 2.92 1 x 1 x | X |23/12/87 | |MUANG KAH- |TAMBON THA KHUN RAM | | 28.20 1 1 1 | |PHAENG PHET | ( QCM | 1 1 1

(THH-12 |NAKHON SAWAN|HAT SANAH LUANG. | 30.50- 36.60| 38.60 1 x 1 x 1 x | X | /03/83| | HQ12 |LAT YAO |HU THI 2, TAMBON HAP | | 3.89 | X 1 x 1 x | X |19/12/87| 1 1 |KAE 1 1 1 1 1 1 1 1 1 QCR | 1 1 1 |THN-13 |PHICHIT |BAH SAI RONG KHLON | 24.40- 36.60| 36.60 1 x 1 x 1 x I | /03/83| | HB94 |TAPHANHIN (PUBLIC ARFA, MU THI 6.1 1 7.21 1 x 1 x I X |15/01/88J | | |TAMBON SAI RONG KHLON | | 28.80 1 1 1 1 1 1 qcp | 700 1 1 1 ITHN-14 |SUKHOTHAI (RAT SAHAKKHI SCHOOL 30.50- 42.70| 36.60 1 x x 1 x 1 x | X | /03/83| ( MB28 (SI SATCHANA-|(BAN NONG-O).HU THI 4, j 4.98 i X | X 117/01/88| | |LAI ITAHBON NONG-0 | 28.90 1 1 1 1 1 1 QCR | 1.115 1 1 1

|THN-15 |PHIrSANULOK |HAT HAKHAM TIA (HAHA 33.72- 39.86| 42.90 X X 1 x I X | /01/83| | PNL7 |MUAKG PHIT- |WANARAM), HU THI 8. | 5.07 X X X |26/12/87| | |SANULOK ITAHBON HUA RO j 28.90 1 1 1 1 1 1 QCH | 1 1

|THN-16 |SUKHOTHAI |SAWANKHALOK HOSPITAL 30.50- 42.7O| 42.70 X X X X | /01/83| | HW6 |SAWANKHALOK (RESIDENTIAL AREA 1 X X X (19/01/88| | | |(WITHIN SAWANKHALOK | 28.00 1 1 | | |OISTRICT COMPAUND) QCP | 1 1

|THN-17 |SUKHOTHAI |WAT KLANG BAN KHHANG, 42.43- 48.54| 51.47 X X X X | /01/83| | SKT67 |MUANG SUKHO-|MU TH1 3, TAMBON BAN | 5.52 X X X 122/01/88] | |THAI |KLAUI | | 29.80 1 1 III 1 QCM | 1,300 1 1 |THN-18 (SUKHOTHAI (BAN WANG LUK PUBLIC | 36.60- 48.80| 48.80 | x 1 X x 1 | /01/83| | MB154 |BAN DAN LAN (AREA. MU THI 1, TAHBON| | 3.39 x 1 X X 121/01/88( j |HOI |TALING CHAN | | 29.00 | ! 1 III 1 qCH | 900 | 1 1 |THN-19 |PHICHIT |BAN WANG SAHRONG PUB- | 42.43- 48.60| 51.65 | x 1 x 1 x 1 X | /01/83| j PC56 |TAPHAN H1N |LIC AREA. MU THI 1, ( 1 - 1 x 1 X 1 X |15/01/88| | | |TAMBON WANG SAMRONG | | 28.90 | 1 1 III 1 QCH ( 190 ( 1 1 1 [THN-20 |KAHPHAENG |SAI NGAH DISTRICT OF- | 46.40- 52.43| 55.48 ( x 1 x 1 x 1 X ( /01/83| | KP55 JPHET |FICE, HU THI 3, TAMBON| 1 4.32 | x 1 x 1 1 X |24/12/87| | JSAI NGAM JSAI NGAH j j 28.40 | 1 1 1 1 III 1 qcH | - | 1 1 1 1 70

Annex 2. (CONTINUE)

|THN-21 |PHITSANULOK | 46.67- 53.33| 56.67 1 x 1 x 1 x | X | /01/83| | |HAKG THONG I 1 1 I 1 1 1 | 1 35.00 1 1 1 1 1 1 1 H 1 1 1

|THN-22 IPHICHIT |PHO THALE DISTRICT | 48.80- 54.90| 58.00 1 x 1 x 1 x | | /01/83| | PC30 JPHO THALE [OFFICE. MU THI 2, 1 1 | X 1 x | X |14/01/88| | | jTAHBON PHO THALE | | 29.30 1 1 1 1 1 f | QCM | 415 1 1 1 |THN-23 |UTTARADIT |BAN HANG TAKHRO PUBLIC | 48.80- 54.90| 54.90 1 x 1 x 1 x | | /03/83| | HB127 |TRON • |AREA. MU THI 2,TAHBON | | 7.33 1 x 1 x | X |18/01/87| | j |BAN KAENG | 28.90 1 1 1 1 1 1 QCM | 150 1 1 1 |THN-24 IPHICHIT |WAT SAHNAK KHUN NEN, 23.80- 29.84| 32.84 1 X i x 1 x | X | /01/83| | PC20 |BANG HUN NAK|MU THI 1, TAHBON SAH- 1 1 x 1 x X 114/01/88J | | |NAK KHUN NEN | 29.00 1 1 1 1 1 1 QCP | 1 1 1 |THN-25 IPHICHIT |BAN NOEN PHO SCHOOL, 51.85- 57.95| 59.48 X 1 x X | X | /01/83| | MB146 |PHO THALE |HU THI 4, TAMBON THAI | 4.86 x X X 114/01/88| 1 1 |NAH | 29.70 1 1 1 1 1 QCH | 1 1

|THN-26 |SUKHOTHAI |SI NAKHON SANITATION 61.63- 67.65| 78.00 X X X X | /03/83| | SKT10 |SI NAKHON |HATER WORKS, HU THI 3. 1 X X X |19/01/88| | | |TAHBON SI NAKHON | 29.50 1 1 1 1 1 QCM | 270 1 1

|THN-27 |PHITSANULOK |WAT NONG HO KAENG 60.50- 66.70| 60.70 X X X X | /01/83| | PNL80 |PHROM PHIRAM|SCHOOL, HU THI 3, j 8.58 X X X |27/12/87| | | |TAHBON THA CHANG | 28.80 1 1 III 1 QCM | 1 1

|THN-28 IPHICHIT |WAT RONG CHANG THAHMA-| 61.95- 68.31| 71.38 x X x | /01/83| | PC65 |MUANG PHI- (KIT HITTHAYA SCHOOL, | j 4.72 X X X |25/12/87| j |CHIT |HU THI 2, TAHBON RONG j | 28.50 1 1 | | |CHANG | QCM | - 1 1 |THN-29 |SUKHOTHAI |BAN SAM PHUANG SAHAK- | 63.55- 69.65| 72.70 | X | X | x 1 X | /01/83| | SKT79 |KHIRI MAT |KHI WITTHAY/t SCHOOL, | | 5.59 | X | x 1 x I X |22/01/88J j | |MU THI 4, TAHBON SAM j | 29.00 j 1 1 | | |PHUANG | QCM | 450 j 1 1 |THN-3O |KAHPHAENG |BAN NON SAMO SCHOOL, | 24.40- 54.90| 57.95 | X | X | X | I /03/83| | C306 |PHET |MU THI 7, TAMBON THEP | 1 4.49 | X j x 1 X |23/12/87J | jHUANG KAH- jNAKHON | | 28.10 | 1 1 | |PHAENG PHET j | QCR | - | 1 1 71

Annex 2. (CONTINUE)

|THH-31 IPHICHIT |BAN HONG HU CHANG | 48.71- 54.88| 61.09 1 x | X | X | | /03/83| | PC52 |SAM NGAH |SCH0OL. HU THI 6, | | 3.51 1 x 1 X |Z4/I2/87| | j |TAMBON BANNA j j 29.60 1 x ! 1 1 || | | QCM | 1 1 1 |THN-32 |SUKHOTHAI |BAH NONG KRADI SCHOOL -| 57.40- 63.40| 75.85 1 * 1 x 1 X I | /03/83| j SKT71 |SI SAHRONG j(BANG PRACHA SAN), | | 11.11 1 x 1 x | X 120/01/88| | | |HU THI 1. TAMBON KO | | 28.70 1 1 ( | | ITALIANG | QCH j 270 1 1 1 |THN-33 |SUKHOTHAI |BAN DAH LAN HOI WITTHA| 18.30- | 80.00 1 x 1 x | X | X | /03/83| | MW21 |BAN DAN LAN |YA SCHOOl. MU THI 1. j | 13.09 1 x 1 x | X |21/01/88| | |HOI (TAMBON BAN DAN LAN HOI| | 29.30 1 1 1 II 1 | QCR | 350 1 1 1 |THN-34 |NAKHON SAWAN|BAN KHOK SAMRONG PUB- | 61.00- 67.10| 70.15 1 x X 1 x | | /03/83| | SKT26 JMUAHG NAKHON|LIC AREA, HU THI 7, | | 8.90 1 * x | X |18/12/87| | | SAWAN |TAMBON NONG KRADON | | 30.40 1 1 1 II f I QCM | 1 1 1

|THN-35 |SUKHOTHAI |TAMBON NA THUHG HEALTH| 69.00- 75.00| 78.00 X X X X | /01/83| | SKT26 ISAWANKHALOK |STATION. TAMBON NA j j 4.59 X X X j19/01/88J | | j THUNG | | 28.60 1 1 II 1 | qCM | 270 1 1 |THN-36 |SUKHOTHAI |WAT NONG BUA , MU THI | 78.10- 84.15| 85.75 X X X | /03/83| | SKT96 I KONG KRAILAT|4, TAHBON KRAI KLANG | | X X X |27/12/87| III II 29.50 1 1 11 1 | QCM | - 1 1

|THH-37 IPHICHIT |CHUMCHON BAN NONG YA | 81.57- 87.62| 85.75 X X X | /03/83| | PC46 |SAM NGAM |PLONG SCHOOL. MU THI | j X X X |24/12/87| | | |1, TAHBON WANG MOK | j - 1 1 II 1 I QCM | 1 1

|THN-38 |KAMPHAENG |WATTHANARAT SUKSA | 54.90- 97.60| 97.60 X | X X | /01/83| | C313 |PHET |SCHOOL(BAN DONG KRA- | | 4.56 X | x 1 X |24/I2/87| | (LAN KRABU |THING). MU THI 5, | | 29.40 1 1 j | |TAHBON PRACHA SUKSAN | QCM | 1 1

|THH-39 |KAHPHAENG |BAH RANG THAEO SCHOOL,|113.85-119.90| 123.00 | X | X | X | X | /03/83| | KP59 |PHET |MU THI 6, TAMBON SALOK| | - | X | X |22/12/87| | |KHANU WORA- |BAT | | 30.70 | x i 1 1 | ILAKSABURI | | QCM | - | 1 1 |THH-40 IPHICHIT |176# BAO SI SATTHA |106.75-112.85| 115.90 | X | X | x 1 | /03/83| j HB143 |PHO THALE |MITTRAPHAP SCHOOL (BAN) | 7.87 | X I x I X 114/01/88J j | |PHO SAI NGAH), MU THI | | - | 1 1 | | |6, TAHBON THAI NAM | QCH | - j 1 1 72

Annex 2. (CONTINUE)

|THN-41 |PHICHIT |SAM NGAH DISTRICT OF- |114.94-121.01| 124.24 1 x 1 X 1 x | X | /03/83| | PC51 (SAM NGAH |FICE, TAHBON SAM MGAM | | 4.36 1 x 1 X | X j24/12/87| 1 1 1 | | 29.70 1 1 1 1 1 1 | QCH | 1 1 1 |THN-42 |PHITSANULOK |BAN CHUH SAENG PUBLIC -|135.00-141.OO| 114.00 1 x 1 X 1 x | | /03/83| | PN13 |HUANG PHIT- |AREA, HU THI 4, TAHBON| | 4.20 1 x I X | X [26/12/87J j ISANULOK |SAMO KHAE | | 28.80 1 1 1 II 1 1 QCH | 1 1 1 |THH-43 |KAMPHAENG |WAT KHONG WILAI, (159.00-165.00) 168.00 1 X 1 x 1 x | X j /03/83| x | KP9 JPHET • |HU THI 4. TAHBON | | 3.17 1 1 * 1 x | X |22/12/87| | JKHLONG |KHLONG KHLUNG j j 33.50 1 1 1 | |KHLUNG | | QCM j 1 1 1 |THN-44 |KAHPHAENG |BAH BO THAH PUBLIC |128.10-158.60! 201.30 X 1 x 1 x | X | /03/83| j HQ89 |PHET |AREA, HU THI 2, TAHBON|170.80-lfi3.fiC| | X X | X J22/12/87| | |KHANU WORA- |B0 THAH | | 32.50 1 1 1 I JLAKSABURI I 1 QCM | 1 1 1 |THH-45 |PHICHIT |WAT PA HAKHAP SCHOOL. | 72.60- 78.60| 181.60 X x 1 x | X |25/12/87| | PC93 jHUANG PHI- |MU THI 3, TAHBOH PA 1 1 4-51 1 1 1 | |CHIT |HAKHAP j | 29.00 1 1 1 1 1 1 | QCH | 1 1 1

Annex 2. (CONTINUE)

QCP = CHAO PHRAYA AQUIFERS QCR = CHIANG RAI AQUIFERS qCM = CHIANG MAI AQUIFERS GR = GRANITIC AQUIFERS PCMS = METASEDIHENT AQUIFERS 74

Annex 3. WELL LOCATION AND DETIALS IN HAT YAI BASIN FOR ENVIRONMENTAL ISOTOPES STUDY.

|THY-O1 | SONGKHLA |KHUAN LANG POLICE | 18.29- 36.58| 213.41 1 x 1 X | X |05/05/88| | H124 | HAT YAI | STATION 1 1 1 1 1 1 1 1 | | 30.0 1 1 1 1 1 1 | KT | 370 1 1 1

|THY-O2 | SONGKHLA |BAN THA SAI SCHOOL | 82.3?-100.60| 185.98 1 x 1 x | X 106/05/88| | H142 I HAT YAI | | 3.19 1 X 1 x | X |09/05/89| 1 ! 1 | | 28.0 1 1 1 1 1 1 | KT | 110 1 1 1

|THY-03 | SONGKHLA |KH0 HONG RUBBER 60.98- 67.07| 170.73 1 x 1 x | X |05/05/88| | H267 1 HAT YAI jRESEARCH CENTFR 91.46-100.60| FLOW 1 1 1 1 1 1 | 29.5 1 1 1 1 1 1 KT | 360 1 1 1

ITHY-04 | SOHGKHLA |WAT KHLONG HAE 30.49- 42.68| 50.30 1 x 1 x | X |06/05/88| | H293 | HflT YAI | | 5.03 1 x 1 x | X |06/05/89| 1 1 1 | 28.8 1 1 1 1 1 1 KT j 140 1 1 1

|THY-O5 ) SONGKHLA jBAN PHRU RADIO RELA- 24.39- 30.49| 47.26 x 1 x | X )05/05/88| | H294 j HAT YAI |TION TRANSMISSION ST. 1 X X X |06/05/89| i : i | 29.2 1 1 1 i i i HY | 40 1 1 1

|THY-06 | SONGKHLA |WAT THEP CHUMNUM 27.44- 33.54| 33.54 X X X |05/05/88| I H320 j HAT YAI jSCHOOL | 4.03 X X X j06/05/89| i 1 1 | 29.2 1 1 III 1 HY | 120 1 1

|THY-O7 | SONGKHLA (BAN TON SAN PUBLIC 1 18.29- 24.39| 27.44 X X X |05/05/88| | H393 | HAT YAI [AREA | 2.64 X X X X j06/05/89| III 1 j 28.7 1 1 III 1 KT | 425 1 1

|THY-08 | SONGKHLA |BAN KHLONG WA PUBLIC | 21.34- 27.44| 36.58 X X X |05/05/88| | H462 | HAT YAI |AREA | | 4.04 | x X X |06/05/89| III 1 | 29.4 1 1 1 III 1 HY | 55 | 1 1

|THY-O9 | SONGKHLA |HAT YAI HOSPITAL | 24.39- 30.49| 44.20 | x 1 x 1 X |05/05/88| | H487 | HAT YAI | | 33.54- 39.63| - j x 1 X | X j 06/05/891 III 1 | 29.0 | 1 1 III 1 KT | 75 | 1 1

|THY-1O | SONGKHLA |WAT KHOK LIANG | 30.49- 39.63| 45.73 | x 1 x 1 X 105/05/88| | H490 | HAT YAI | | 1 - 1 X | x 1 X | X |06/05/89| III 1 | 28.8 | 1 1 1 1 III 1 KT | 400 1 1 1 1 75

Annex 3. (CONTINUE)

| CODE | LOCATION | SLOTTED [WELL DEPTH (M)| SAMPLE TYPES |SAMPLING I | PERFORATION | WATER LAVEL (M) | - | DATE 1 1 1 1 | (11) | TEMPERATURE (C)| | | | | | AGENCY | PROVINCE | DETAILS | AQUIFER |CONDUCTANCE |0-18|H-2|C-14|H-3| I»ELL NUMBER | D1SW1CT 1 | TAPPED | (Micro MHOS/CM)) J | j |DD/MM/YY |THY-11 | SONGKHLA fMASVIT BAN PO MO | 22.86- 32.01| 64.02 1 * 1 x | X |05/05/88 x | H508 | HAT YAI | 1 1 3.49 1 * 1 * 1 | X 106/05/89 1 1 1 | j 28.5 1 1 1 1 1 1 j KT | 140 1 1 1

|THY-12 [ SONGKHLA |WAT LIAP | 60.98- 73.17| 76.22 1 X 1 x | X |05/05/88| | H515 ! HAT YAI | 1 1 1 * 1 X 1 x | X (07/05/89 1 1 1 1 1 28.5 1 1 1 1 1 KT | 375 1 1 1 |THY-13 SONGKHLA |BAN HU RAE SCHOOL 42.68- 51.82| 67.07 1 x 1 x | X |05/05/88| | H535 HAT YAI | 1 2.27 I x 1 x 1 x | X |07/05/891 1 1 j 28.4 1 1 1 1 1 KT | 260 1 1 1 |THY-14 SONGKHLA |BAN PLAK KHLA SCHOOL 109.76-125.00| 125.00 I X 1 x | X |05/05/88| | H591 HAT YAI | | FLOW X 1 X 1 x | X |06/05/89) 1 1 j 32.7 1 1 1 1 1 KH | 150 1 1 1

|THY-15 SONGKHLA |WAT NA RANG NOK SCHOOL 27.44- 33.54| 60.98 X ! X | X |06/05/88| | H631 HAT YAI | | 2.77 X X 1 x | X |09/05/89| 1 1 | 29.3 1 1 1 1 1 HY | 175 1 1 1

|THY-16 SONGKHLA |BAH CHOH LAM PUBLIC 24.39- 36.58) 44.20 X X X |05/05/88| | H716 HAT YAI |AREA 1 X X X |07/05/89| 1 1 | 30.8 1 1 1 1 KT | 215 1 1

|THY-17 SONGKHLA |BAN NONG MUANG PUBLIC 59.45- 62.50| 65.54 X X X |06/05/88| | H752 HAT YAI |AREA | 1.28 X X X X 109/05/891 1 1 1 | 30.5 1 1 1 1 1 KT | 1,210 1 1

|THY-18 | SONGKHLA |CHIRA HAKHON STADIUM 32.01- 35.06| 48.78 X X X |05/05/88| | H78i | HAT YAI | | 38.10- 41.16| X X X j06/05/89) 1 I 1 1 j 29.7 1 1 1 1 1 1 KT j 60 1 1

|THY-19 | SONGKHLA |KHU TAO WITTHAYA |109.76-115.85| 149.39 | X j X X 106/05/88| | H783 | HAT YAI jSCHOOL | | 1.60 j X | X X X |08/05/89| 1 1 1 1 | 30.0 | 1 1 1 1 1 1 KH | 3.500 | 1 1

|THY-2O | SONGKHLA |BAN TAI SCHOOL | 67.07- 73.17| 76.22 | X | X | X |06/05/88| | H907 j HAT YAI | | | 0.09 | X | x 1 x 1 X |08/05/89| 1 1 t 1 | 29.8 | 1 1 1 1 1 1 1 KT | 1.450 | 1 1 1 76

Annex 3. (CONTINUE)

| CODE | LOCATION 1 SLOTTED | WELL DEPTH (M)| SAMPLE TYPES |SAMPLING| 1 | PERFORATION | WATER I.AVEL (M)1 _| (wrc 1 1 1 1 1 1 (M) (TEMPERATURE (C)III!! 1 | AGENCY | PROVINCE | DETAILS | AQUIFER (CONDUCTANCE |0-18|H-2|C-14|H-3| | |WELL NUMBER | DISTRICT j | TAPPED | (Micro MHOS/CM)| | | | |DD/MM/YY| |THY-21 | SONGKHLA |WAT THAHHAKHOT | 42.68- 48.78| 70.12 1 * 1 x | X |06/05/88| | H420 j NUANG | 1 1 2-23 1 x 1 x 1 X | X |10/05/89 1 1 1 1 29.5 1 1 1 1 1 | KT | 2,750 1 1

|THY-22 SONGKHLA |WAT BAN PRATU CHAI 7o.22- 85.36| 94.51 X X X |06/05/88| | H448 HUANG JSCHOOL | 2.66 X X X X |09/05/89| 1 1 | 30.0 1 1 1 1 KT | 1,100 1 1

|THY-23 SONGKHLA |SONGKHLA PHITTHAYAKHOM 64.02- 73.17| 77.74 X X X |06/05/88| | H954 MUANG |SCHOOL | 3.4 X X X X |09/05/89| 1 1 | 30.2 1 1 1 1 KT j 1.300 1 1

|THY-24 SOHGKHLA (BAN PLAI NA PUBLIC 103.66-109.76 1 115.85 X X X |06/05/88| | H584 MUANG |AREA 2.32 A X X |09/05/89| 1 1 30.7 1 1 1 1 KH 775 1 1

|THYS-O2 | SONGKHLA (KHLONG U TA PHAO X X X |06/05/88| 1 1 HAT YAI j | X X | X |07/05/89| 1 1 1 1 32.3 1 1 1 1 I 1 10,000 | 1 1

HY = HAT YAI AQUIFER, HIGHLY PRODUCTIVE KT = KHU TAO AQUIFER, MODERATELY PRODUCTIVE KH = KHO HONG AQUIFER, LESS PRODUCTIVE