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' Deoember 16, 2002 e^ Job Nwmber: LG02-213 time vias.close to "natural".cos ditions. Basod on the work by Bryan, it is estimated that ender "natuural" •conditions. Vuund water concxntrauon containing nitrate is no -marc than about 13.5 NU, (3 mg/L-N), Aquifers having 24.75 mg/L NO, (5-5 mgt -N) or more are those in which _ nitrate concentrations may be in,cr6asing.1 DACP was not detected in tate wafer sample, D13CP is a nematocide and soil funmi ant is R . for vegetables, and grapes. It is thought to cause health Or.obleras consisting of kidisey damage, liven damage, and cancer. The use of DBCP.was discontinued in 1979, The Environmental - Protection Agcncy (EPA) act the maximwn contaminate limit (MCS,) at 0.2 parts per billion (ppb) because the EPA believes that given present technology and resourccs, this is the lowest lcv4 to which water systems can reasonably be -required to remove this contaminate should it occur in drinking water.' The gnaund-water depth and flow direction for the site was estimated by using the San Joaquin County Flood Control and Water Conservation District ground -water depth and elevation mays. The Fall 1995 and- Spring. 1999 are the most recent ground water. maps available .i.- for the county_ The depth to ground water below the site for this period is about 23 feet. The flow direction is nci thwcst to north ranging aboL4 5 to 5.3 feat per mile for the gradient Sex Plates 2 and 3 for the ground water depth and Plates 4 and 5 for the ground-watcr grzident. Vl. GEOLOGY, SOILS, AND PFACOI.ATiON TEs,r The Surface geology at the site is shown on Atwatees'rnap and is composed of " Pleistocene'Modesto Formation consisting of loose fluvial sands and silts (Plate 6).3 According to the San Joaquin Soil Sunry.s-urface :+oils located on the parcel are c mripbsed of three (3) j= differcrnt soil types (Plate 7)1. The soils are they Hortcut sandy loam (No: 175), Tittnin loamy E_ Hull, l„C,, 1984, (j�whewistry ofGrgwo Water m the SaxTavrwiao Valley, C*1ifmnis; VS. Goologival {_ Surwy.rmfetsional PVrr 1401 -As 4 EPA, 1994, Drin)drtg watet ant brxtth, NaticmW t1rtmary Urmkiag Waa Regulations, conaunct r"i Ok%q on: D1HR0M00iL0ik0PRPUANE Intersex- hM:Ifvivw.epa.gov,IOGWDWldwbit-sodd%mmoc.html Atwater, iiT., 1987, Geologic Maps of dw Sacramento. -Sm h4qu.in Delta, California; U.S. Geologic . -� Survey tvCkamlam� Field Survey Map NIF-1401, 21 Sham, Scale 4:24,000. f— 6 USDA Sud Cx�arva600 Smkc, Sod Survey of -San Roquin Copery, 17_916 znia. . 1