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pig.- MUM M EHME I HYPROOBOLOGIC ASS95MT, 7910 Lamr Sacramento Road,Stockton,CrXfornia Dalta Prcjm No.4088-147 Page,4 VII11HPs The site ties within the city or Stockton ann on city water and sewer. Sewcr, water, and storm lines are located along Lower Sacramento Road. :)re drilling was initiated,Underground Service Alert was wa contacted to locate all buried utilities. 7.9 Well Inventory An inventory of existing domestic and municipal water supply wells near the site was initiated on February 22, 1989,by a Delta representative at the California Department of Water Resources (DWR), According to DWR records,25 wells are present witi.in a 112-mile radius of the site. 2.6 Tank Closure Results t-4 On December 20, 1988, four underground storage tanks were excavated, removed, and transported to Triangle Construction.lac.,Sacramento, California. Eight soil,samples were obtained from the bottom of the excavation and sent to Eureka Laboratories, Inc., for chemical analysis of benzene, toluene, ethylbenzene,xylenes 03TE3),and total petroleum hydrocarbons (ITT,ethylene dib romide(EDB).and organic lead. The results indicated the soils at a depth of 15 feet contained petroleum hydrecarboaL A summary of the chemical analysis is presented in Table I Soil sample identification and loedlions are shown in Figure Z Concentrations of TPH ranged from nondetected in samples T-1,T-2,T-3,and T-4; i to 4J880 ppm in T-5; 4,790 ppm.in T-6, 1,500 ppm in T-7; and 120 ppm in T-& TABLE 2 t Chemical Analysis of Soil Samples from Bottom of Old Tank ovation Concentrations in milligrams per kilogram/mgAg (ppm) I. Sample Date Approximate Ethyl- Organic _M_ g&IJected 2WLhjfeetj Benzene benzene TolueneLead &Ienes T-1 11110 i5 <0.001 <0.001 <0.001 <0.001 <10.0 <0.05 T-2 120M 15 <0.001 <0.001 <0.001 <0.001 <10.0 <0,05 -3 IZOM is <0.001 <0.001 <0.001 <0.001 T <1010 <0.05 T-4----12120188- -7—-15-------<0.001- --<0.001— <0.001 <0.001 <10.0-- X0.05 T-5 12120M. 15 310 29.6 27.4 188.0 4,88O.Ob 0.13 T-6 12(20188 15 177 33.9 32-1 187.0 4,790.Ob 0.46 FT-7 I1/20188 is <0.050 10.4 .1.7 .74.5 I500-011: <0.05 'T.8 WOM is <005 0.095 0.130 0.470 120.M. <0.05 "Total petroleum hydrocarbons b1dentifled as gasoline.