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March 26,2003_ <br /> Job Number:'LG02-031' , <br /> Page 4 <br /> was close to "natural" conditions. Based on thew <br /> ork by Bryan, it estimated that under <br /> "natural" conditions, ground water concentration containing nitrate is no more then about 13.5 <br /> NO (3 rtiglL-N). Areas having 24.75 mglL NO3(5.5 mg/L-N) or more are those in which nitrate <br /> 3 <br /> r <br /> concentrations may,be increasing.3 <br /> DBCP was not detected'in the water sample. DBCP is a nematocide and soil furnigant for <br /> vegetables, and grapes. It is thought to cause health problems"consisting of kidney damage, liver <br /> darriage,,and cancer:'The use ofDBCP was•discontinued in 1979'.''The Environmental Protection <br /> Agency(EPA) set the maximum contaminate limit'(MCL) at 0.2 parts per biliion.(ppb)because <br /> the EPAbelieves,that given present technology and resources, this, . lowest Ieve1 to which ' <br /> t water systems can'reasonably be required to remove this contaminate should it occur m.drinking <br /> water.a <br /> 4.0 GEOLOGY, SOILS,-AND PERCOLATION TEST <br /> The surface geology at the.site is shown on a geologic map prepared Marchand and Bartow (Plate <br /> 6). The surface geology of the site is reported to be the Pleistocene age Riverbank Formation <br /> which is composed'of arkosic.alluviums' Alluvium in this area is often"composed of sand or <br /> .mixtures,of sand, silt, and-Clay. . <br /> The surface and-near surface soils located at the site are reported.to be the Tokay fine sandy loam <br /> no.,256) 6. 'The San 3oaquin Soil Survey.lists various enginee,nng�properties for the Tokay fine. <br /> sandy loam (See Table 1). . ; <br /> ,: . <br /> . 3 Hull,L.C., 1984;Geochemistry of Ground Water in the Sacramento Valley;California:U.S.Geological <br /> Survey Professional Paper,l401-B. <br /> k <br /> 4'EPA, 1999,Drinking water and health,Nati Primary Drinking Water Regulations,consumer fact <br /> sheet on:DIBROMOCHLOROPRPOANE_ 'Internet:http://www.epa.gov./OGWDW/dw e socldibzomoc.html <br /> `-� s D.L.Wagner and others,Geologic Map of the San Francisco-San 7ose_Quadrangle, 1990,Map No. SA: <br /> -Division.of Mines and Geology,scale 1:250;000: <br /> 6 USDA Soil Conservation Service,Soil Survey of San Joaquin County,California, Sheet"&. ' <br /> � 4 <br />