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WEST CONTRA COSTA SANITARY LANDFILL, <br />1 PARR BOULEVARD, RICHMOND, CALIFORNIA <br />FORWARD LANDFILL, 9999 S. AUSTIN ROAD, <br />MANTECA, CALIFORNIA <br />CDCR EW-2 CONSTANT RATE TEST <br />SHALLOW WELL HYDROGRAPHS <br />6/5/2023 8:53:08 AMEW-2 <br />(Pumping) <br />PZ-1 <br />CRT Pumping Phase Recovery Phase <br />14.4 ft Drawdown <br />0.4 ft Drawdown <br />0.3 ft Drawdown <br />AMW-22S <br />PZ-2 <br />0.2 ft Drawdown Water Level (feet MSL)Water Level (feet MSL)Water Level (feet MSL)Water Level (feet MSL)▪EW-2 <br />▪Screen 103-123 ft bgs <br />▪8-hour pumping phase on <br />5/4/2023 <br />▪Pumped at 24.4 gpm <br />▪Total discharge 11,700 gallons <br />▪14.4 ft drawdown <br />▪PZ-1 <br />▪Screen 60-95 ft bgs <br />▪Located 21 feet from EW-2 <br />▪0.4 ft drawdown <br />▪PZ-2 <br />▪Screen 68.5-98.5 ft bgs <br />▪Located 56 ft from EW-2 <br />▪0.3 ft drawdown <br />▪AMW-22S <br />▪Screen 62-82 ft bgs <br />▪Located 107 ft from EW-2 <br />▪0.2 ft drawdown <br />▪Conclusion: Hydraulic influence from <br />EW-2 pumping wells indicated up to <br />107 ft within the shallow zone at a <br />pumping rate of 24.4 gpm over an 8- <br />hour period <br />Legend <br />CDCR -California Department of Corrections and Rehabilitation <br />CRT –Constant Rate Test <br />ft -feet <br />btoc –below top of casing <br />gpm -gallons per minute <br />gal –gallons <br />■-Manual water level reading <br />Water levels have been corrected for barometric pressure influence <br />Vertical scale on graphs is not uniform between graphs <br />Drawdown trends interpreted from pressure transducer data