Sabaneta Pt 145°48' Saddok Tasi monitor well 1 (ST-MW1) 0 EA 3/11/99 S 15°16' 20 7/23/99 10/14/99 E 40 IN Marpi P Quarry P 60 I IL Fanonchuluyan ET FE , IN LE B A H 80 P Bay N T ER T San Roque A A E 100 C Mañagaha Achugao Spring (Bobo Achugao) O Island 120 145°44' C 140 Tanapag II Spring (Bobo Mames) I W LOW BE TH EP D IF 160 Tanapag Tanapag I Spring (Bobo Agatan) C Harbor A 180 ST-MW1 P 0 0 0 0 0 0 0 0 0 0 0 Puerto 0 0 0 0 0 0 0 0 0 0 Muchot Pt r 0 0 0 0 0 0 0 0 0 0 Rico t , , , , , , , , , , S 0 2 4 6 8 0 2 4 6 8 1 1 1 1 1 2 Kagman monitor well 3 (KG-MW3) u F Str 0 a South k T lufofo g a 9/24/98 CHLORIDE CONCENTRATION, Sablan u Quarry p IN MILLIGRAMS PER LITER a 20 3/15/99 and R 10/14/99 Maui IV Capital T E Hill E 40 F N Donni Spring I , 15°12' Calhoun (Bobo I Denni) E 60 L B A T Koblerville monitor well 1 (KV-MW1) 0 80 R TE 7/20/99 A Gualo Akgak AG-MW1 20 10/18/99 Rai 100 40 120 Mt. Tagpochau 60 140 W W ELO H B PT DE EET N F E, I BL A 80 160 T ER T Chalan Kagman A 100 Kiya 180 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 , , , , , , , , , , 2 4 6 8 0 2 4 6 8 0 120 KG-MW3 1 1 1 1 1 2 CHLORIDE CONCENTRATION, Lake San Vicente Kagman IN MILLIGRAMS PER LITER 140 Susupe W W LO BE TH EP D Peninsula Dan Dan monitor well 1 (DD-MW1) 0 160 3/12/99 Chalan Dan Dan Kanoa 20 7/21/99 180 10/20/99 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Laolao 0 0 0 0 ET E , , , , , , , , , , 40 0 2 4 6 8 0 2 4 6 8 1 1 1 1 1 2 Bay F N DD-MW1 I , CHLORIDE CONCENTRATION, E 60 L IN MILLIGRAMS PER LITER B San A T 15°08' Antonio 80 ER IF-MW1 T Isley Field monitor well 2 (IF-MW2) A 0 100 KV-MW1 IF-MW2 9/28/98 3/10/99 Isley 20 120 Agingan Pt Reservoir 10/15/99 CPA Isley Field T E Tower E Koblerville and Obyan 40 140 N F I W W LO BE TH DEP , OB-MW1 Saipan E 60 160 L Obyan monitor well 1 (OB-MW1) B 0 International A T 10/5/98 Airport 80 180 0 0 0 0 0 0 0 0 0 0 0 R E 3/9/99 T 0 0 0 0 0 0 20 0 0 0 0 A 0 0 0 0 0 0 0 0 0 0 , , , , , , 10/18/99 , , , , 0 2 4 6 8 0 100 2 4 6 8 1 1 1 1 1 2 40 CHLORIDE CONCENTRATION, Base modified from 120 U.S.Geological Survey, 1:25,000, Island of Saipan, 1983 IN MILLIGRAMS PER LITER 60 Shaded relief from USGS digital elevation model 0 1 2 MILES 140 ET FE , IN LE AB W W ELO B PTH E 80 D I Naftan Pt T ER T 0 1 2 KILOMETERS 160 A 100 180 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 120 0 0 0 0 0 0 0 0 0 0 0 0 0 0 , , , , , , , , , , 0 2 4 6 8 0 2 4 6 8 1 1 1 1 1 2 140 CHLORIDE CONCENTRATION, W OW BEL H EPT D IN MILLIGRAMS PER LITER 160 180 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 , , , , , , , , , , 2 4 6 8 0 2 4 6 8 0 1 1 1 1 1 2 CHLORIDE CONCENTRATION, IN MILLIGRAMS PER LITER EXPLANATION Puerto Rico MUNICIPAL WELL FIELD AND NAME LOW-PERMEABILITY VOLCANIC ROCKS AT OR ABOVE SEA LEVEL IF-MW1 MONITOR WELL AND NAME KV-MW1 DEEP-PROFILING MONITOR WELL AND NAME Isley Reservoir RAINFALL STATION AND NAME SEA-LEVEL STATION Donni Spring (Bobo I Denni) DEVELOPED SPRING AND NAME LINE OF SECTION -- SEE FIGURE 5 Figure 8. Municipal well fields, low-permeability volcanic rocks at sea level, and chloride concentration with depth at deep-profiling monitor wells, Saipan (water samples collected by the USGS were analyzed for chloride concentration by the CUC laboratory). .