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E- April 1, 2005 _ NOA Project Number: E05034A ill 4.0 GROUND WATER-INFORMATION /4:1 Ground Water Depth and Gradient - The San Joaquin Coun Flood Control arid Water Conservation District 1998 and 1999 ground J q _ ( ) .water depth and elevation maps were reviewed to-determine the ground water levels near the Site. --The Fall 1998 and Spring 1999 maps are the most current official^maps available-fron-Lthe County. -According to-these maps (Plates,N-G),ground water'lies betiueerr--130 and 140 feet below gro d surfke.and flows at a gradient,of about 5 feet per mile to the we sTm-the u e#moi. /Noround water was encountered b the staff of Neil O.Anderson&Associates, Inc. during the g Y. _ g drilling of one percolation test hole to a depth of three feet on Marchl8 2005: •�4.2 .. Potential Ground Water Coritamitiation Issues _- Identifying potential ground-water contamination sources was not part of the scope of work for the soil suitability study. Potential ground-water contamination can occur from a number.of sources which often include leaky-underground storage tanks, agricultural activities, dairies, septic systems, and storm water infiltration. Agricultural activities and the use=o£septic systems in the area should be considered potential ground-water contamination sources. _ ` v. ✓_.4.3 - Water Sample Location: One well exists on the site. No well permits were found during file review at EHD on March 7, 2005. A water sample was taken from the well head of the domestic well by Mr. Conor McGee of - our office on Match 18,2005.=� e 4<"4.4 Water Sample Constituents .::.The water sample was analyzed for nitrate and DBCP. Nitrate and DBCP were both not�de� tett din =the water sample. The analytical reports prepared by Precision_ Enviro-Tech can be found in the appendix of this report. - The presence of nitrates is not uncommon in shallow ground water aquifers in San Joaquin County _. ntral Valley. Nitrate in ground water occurs as a result of the application and other parts of the Ce of fertilizers, livestock waste;and untreated septic tank waste. Nitrate is.mobile and often accumulates in the shallow ground water zones.