Water Quality Report of the Seven Crater Lakes 2006-2008
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Water Quality Report WATER QUALITY REPORTof the OF THE SEVEN CRATER LAKES 2006-2008 SSeevveenn CCrraatteerr llaakkeess Prepared by: Imelda R. Zapanta – Chemist II Michael Salandanan – Biologist I Marilou G. Directo – Senior Environmental Management Specialist Usman Datu Mamadra Jr. – Laboratory Technologist II Jonathan U. Nicolas – Aquaculturist II Archilles R. de la Cruz – Data Encoder Reviewed by : Jocelyn G. Sta. Ana – OIC, Environmental Quality and Research Div. Adelina C. Santos-Borja – OIC, Environmental Regulations Department Jacqueline N. Davo – Licensing officer III For more information, please contact Environmental Quality Management Division (EQMD) Laguna Lake Development Authority Km. 24 Manila East Road Club Manila East Compound Taytay, Rizal LAGUNA LAKE DEVELOPMENT AUTHORITY Environmental Quality and Research Division WATER QUALITY REPORT OF THE SEVEN CRATER LAKES 2006-2008 Prepared by: Imelda R. Zapanta – Chemist II Michael Salandanan – Biologist I Marilou G. Directo – Senior Environmental Management Specialist Usman Datu Mamadra Jr. – Laboratory Technologist II Jonathan U. Nicolas – Aquaculturist II Archilles R. de la Cruz – Data Encoder Reviewed by : Jocelyn G. Sta. Ana – OIC, Environmental Quality and Research Div. Adelina C. Santos-Borja – OIC, Environmental Regulations Department Jacqueline N. Davo – Licensing officer III For more information, please contact Environmental Quality Management Division (EQMD) Laguna Lake Development Authority Km. 24 Manila East Road Club Manila East Compound Taytay, Rizal Tel. No. 286-61-43 Fax No. 286-61-43 Email Address: [email protected] TABLE OF CONTENTS Page INTRODUCTION …………………………………………………………………………. 1 METHODOLOGY ……………………………….………………………………………… 3 WATER QUALITY EVALUATION…….…………………………………………………. 4 pH…………………………………………………………………………………………. 4 Dissolved Oxygen (DO)….…………………………………………………………….. 4 Biochemical Oxygen Demand (BOD)…………………………………………………. 10 Ammonia (NH3-N)…………. …………………………………………………………… 11 Nitrate (NO3-N)………………………………………………………………………….. 12 Phosphate (PO4-P)……………………………………………………………………… 13 Chloride…………………………………………………………………………………… 14 Turbidity…………………………… ……………………………………………………. 15 Total Dissolved Solids (TDS) ….……………………………………………………... 16 Total Suspended Solids (TSS)…………………………………………………………. 17 Total Coliform/Fecal Coliform …………………………………………………………. 18 Chlorophyll-a…………………..…………………………………………………………. 20 Phytoplanktons….……………………………………………………………………… 21 Zooplanktons…………………………………………………………………………… 23 RECOMMENDATIONS………………………..………………………………………… 25 LIST OF FIGURES Page FIGURE 1. Seven Crater Lakes…………. …………………..………………………... 2 FIGURE 2. pH Level in the Seven Crater Lakes………………..…………………….. 4 FIGURE 3. Dissolved Oxygen Level in the Seven Crater Lakes…..………….……… 5 FIGURE 4. Dissolved Oxygen Profile in Bunot Lake….…………….………………... 6 FIGURE 5. Dissolved Oxygen Profile in Calibato Lake……….………………………. 6 FIGURE 6. Dissolved Oxygen Profile in Mohicap Lake ..…………………………….. 7 FIGURE 7. Dissolved Oxygen Profile in Palakpakin Lake………..…………………… 7 FIGURE 8. Dissolved Oxygen Profile in Sampaloc Lake……..………………………. 8 FIGURE 9. Dissolved Oxygen Profile in Pandin Lake………….…………………….. 8 FIGURE 10. Dissolved Oxygen Profile in Yambo Lake………..……………………… 9 FIGURE 11. Biochemical Oxygen Demand Level in the Seven Crater Lakes ....….. 10 FIGURE 12.Ammonia Level in the Seven Crater Lakes .…………………………….. 11 FIGURE 13.Nitrate Level in the Seven Crater Lakes ………………………………… 12 FIGURE 14. Phosphate Level in the Seven Crater Lakes………….………………… 13 FIGURE 15. Chloride Level in the Seven Crater Lakes….………….………………… 14 FIGURE 16. Turbidity Level in the Seven Crater Lakes’’’’.………….………………… 15 FIGURE 17. Total Dissolved Solids Level in the Seven Crater Lakes.……………… 16 FIGURE 18. Total Suspended Solids Level in the Seven Crater Lakes.…………… 17 FIGURE 19. Total Coliform Counts in the Seven Crater Lakes…….………………… 18 FIGURE 20. Fecal Coliform Counts in the Seven Crater Lakes….………………… 19 FIGURE 21. Chlorophyll-a Level in the Seven Crater Lakes..…….………………… 20 FIGURE 22. Total Phytoplankton Counts in the Seven Crater Lakes.…………… 21 FIGURE 23. Total Zooplankton Counts in the Seven Crater Lakes.………………… 24 LIST OF TABLES Page TABLE 1. Characteristics of the Seven Crater Lakes ………………………….. 1 TABLE 2. Phytoplankton Counts by Group………………………………….…… 21-22 TABLE 3. Zooplankton Counts by Group …………………………………..……. 23 Water Quality Report of the Seven Crater Lakes 2006-2008 WATER QUALITY REPORT OF THE SEVEN CRATER LAKES I.Introduction San Pablo City is a chartered city in the Province of Laguna. It is approximately 70 kilometers away from Metropolitan Manila. It is famous for its Seven Crater Lakes, also known as Maar Lakes namely: Bunot Lake, Calibato Lake, Mohicap Lake, Palakpakin Lake, Pandin Lake, Sampaloc Lake and Yambo Lake. Its catchment area is Mt. San Cristobal with an area of 27.5 square kilometers. Lake Elevation Water Area (m,asl ) (hectares) Depth (m) Bunot 110± 23.0 30.5 ( Brgy Concepcion SPC) Calibato 170± 156.0 43.0 (Brgy Sto. Angel SPC,Brgy Tala & Brgy Antipolo Rizal Laguna ) Mohicap 80± 30.40 22.89 ( Brgy. San Buenaventura SPC ) Palakpakin 100± 7.7 47.98 (Brgy.Dolorez,San Lorenzo,San Buenaventura SPC ) Pandin 160± 61.75 24 (Brgy Sto. Angel SPC ) Sampaloc 106 27.60 104.0 ( Brgy Concepcion, IV-A,V-A, San Lucas I SPC) Yambo 160± 38 30.5 (Brgy San Lorenzo SPC,Brgy Sulsugin Nagcarlan Laguna ) Table 1: Characteristics of the Seven Crater Lakes The Seven Freshwater Lakes of San Pablo City were formed by a unique process called phreatic eruption where shallow lava from Mt. San Cristobal intersected groundwater which blew out (steam-heated eruption) the overlying rocks to form a circular and crater-like depression that eventually filled up with Environmental Quality and Research Division Laguna Lake Development Authority 1 Water Quality Report of the Seven Crater Lakes 2006-2008 rainwater. The varying depths of these lakes which are from 7 meters to 156 meters suggest a volcanic origin. (Ramon B. San Andres – FSLF, Inc.) Sampaloc Lake is the largest among San Pablo’s Seven Crater Lakes. It is considered one of the prime tourist spots in the city. It abounds with tilapia, big head carp and several species of freshwater fish like ayungin, dalag and hito including shrimps. Calibato Lake is the deepest of all the seven lakes with an average depth of 156 meters. It has the greatest volume of water in storage which is approximately 29,600 cubic meters. Calibato Lake supplies the city and nearby towns with abundant fish. Pandin Lake and Yambo Lake are known as “ The Twin Lakes “.Both lakes are considered oligotropic because of their deep clear lakes with low nutrient supplies, high dissolved oxygen level and containing little organic matter. Pandin Lake is San Pablo’s best kept lake. Mohicap Lake is also a major source of tilapia for Metro Manila and suburbs. Palakpakin Lake, the shallowest among the seven lakes, is utilized as communal fishing ground. An increasing construction of fishcages resulted to limited open fishing ground for the fisherfolks. Bunot Lake is used primarily for floating cages operation where most of the resident derived their source of income. Fig. 1 – Seven Crater Lakes Environmental Quality and Research Division Laguna Lake Development Authority 2 Water Quality Report of the Seven Crater Lakes 2006-2008 II. METHODOLOGY The monitoring and sampling of the Seven Crater Lakes is conducted every month in the 1st and 4th quarters of the year and every 3rd month of the 2nd and 3rd quarters of the year. Parameters monitored include: Physico-Chemical parameters: pH Dissolved Oxygen at different depth Biochemical Oxygen Demand Ammonia Nitrate, Phosphate Total Dissolved Solids Total Suspended Solids Chloride Turbidity Biological parameters: Phytoplankton Zooplankton Chlorophyll-a Bacteriological parameters: Total Coliforms Fecal Coliforms Environmental Quality and Research Division Laguna Lake Development Authority 3 Water Quality Report of the Seven Crater Lakes 2006-2008 III. WATER QUALITY EVALUATION Monitoring data are evaluated based on the Class C Water Quality Criteria under the Department of Environment and NaturaL Resources (DENR) Administrative Order #34 Series of 1990. 1. pH The term “pH” was originally derived from the French term “pouvoir hydrogene”; in English, this means “hydrogen power.” pH is a measure of the acidity or alkalinity of water. It is usually measured by a colorimetric test - litmus paper which changes color with increased acidity or alkalinity or by electrometric method - pH meter. The pH scale ranges from 0 to 14. If the water is acidic, the pH is 0 to 6.9; neutral is 7.0; alkaline is 7.1 to 14. A pH range of 6.5 to 8 is optimal for freshwater. All the Maar lake stations conformed to the pH criterion of 6.5 to 8.5 units for the period 2006 to 2008. 2006 pH 2007 2008 9 C las s C C riterion 8 7 C las s C C riterion u 6 n 5 i 4 t 3 s 2 1 0 BUNOT PANDIN YAMBO CALIBATO MOHICAP SAMPALOC PALAKPAKIN Figure 2. ph Level in the Seven Crater Lakes Environmental Quality and Research Division Laguna Lake Development Authority 4 Water Quality Report of the Seven Crater Lakes 2006-2008 2. DISSOLVED OXYGEN ( DO ) Dissolved Oxygen is a very important indicator of a water body’s ability to support aquatic life. It is found in microscopic bubbles of oxygen that are mixed in the water and occurs between water molecules. Oxygen enters the water by absorption directly from the atmosphere or by aquatic plant and algae photosynthesis. Oxygen is removed from the water by respiration and decomposition of organic matter. The colder the water, the more