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`. `/ January 14,2003 Job Number: LG02460 Page 4 r N). Areas having 24.75 mg/L NO3 (5.5 mg/L-N) or more are those in which nitrate concentrations may be increasing.' L DBCP was not detected in the water sample. DBCP is a nematocide and soil fumigant for vegetables, and grapes. It is thought to cause health problems consisting of kidney damage, liver damage, and cancer. The use of DBCP was discontinued in 1979. The Environmental Protection Agency(EPA) set the maximum contaminate limit (MCL) at 0.2 parts per billion because the 6. EPA believes that given present technology and resources,this is the lowest level to which water systems can reasonably be required to remove this contaminate should it occur in drinking water! r 5.0 GEOLOGY, SOILS,AND PERCOLATION TEST The surface geology at the site is composed of alluvium of Holocene age supratidal flood plain deposits (Plate 2).5 These deposits are composed of a heterogeneous mix of clay, silt, sand, and occasionally gravel and organic plant remains. The majority of surface soils located at the site are reported to be the Egbert silty clay loam (no. 153) (Plate 3).6 The Egbert silty clay loam is described as a very deep,poorly drained,nearly level soil on flood plains. Permeability is slow on the Egbert silty clay loam. 6 b. ' Hull,L.C., 1984,Geochemistry of Ground Water in the Sacramento Valley,California: U.S.Geological r, Survey Professional Paper 1401-B. 4 EPA, 1999,Drinking water and health,National Primary Drinking Water Regulations,consumer fact sheet on:DIBROMOCHLOROPRPOANE. Internet:http://www.epagov./OGWDW/dwh/c-soc/dibromoc.htznl t, 5 Atwater,B.F., 1982,Geologic maps of the Sacramento-San Joaquin Delta,California:U.S. Geologic Survey Miscellaneous Field Survey Map MF-1401,21 Sheets,scale 1:24,000. to 6 USDA Soil Conservation Service,Soil Survey of San Joaquin County,California, sheet No.23. OE RSOi 4 O > �lSOC\