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Groundwater elevations in the upper aquifer are fairly flat <br /> e direction of groundwater flow appears to be <br /> lying' but the <br /> the northwest. As shown in Plate 2, a <br /> approximately <br /> difference of only a couple tenths of a foot in water surface <br /> elevation. <br /> III. CHEMICAL ANALYSES OF SOIL AND WATER SAMPLES <br /> Both the soil and water samples were kept on cold storage <br /> eria <br /> transported and <br /> to the chemical laboratory with of theSapJoaquin <br /> e approp <br /> chain rt custody forms. At the request <br /> chain <br /> ironmental Health Division, the soil and water samples were <br /> Envtested for the following parameters: <br /> o Total(Anametrixoctest nEPA y 5020) , EPA modified EPA 3015 8010 (EAB) , <br /> Benzene <br /> Toluene <br /> ® Xylenes (j1TX) <br /> organic lead <br /> Ten soil samples were tested for the parameters above. The <br /> concentrations of chemical compounds are reported in Appendix <br /> nd in <br /> C. The <br /> wh ih est concentrations <br /> the boring edof fi.nlthe ntanklsremovalwere ouarea. <br /> MW-4, <br /> The concentrations increase with depth in MW-4 except for the <br /> lead concentration. Benzene was found at a concentration att20.5-21 <br /> 62.0 ug/gm (ppm) at 11-11.5 feet to 95.0 um/gmt(�P-11.5 feet to <br /> f feet. Toluene range from 120,0 ug/gm (ppm) <br /> 130.0 ug/gm (ppm) at 20.5-21 feet. Total xylenes ranged from <br /> 46.0 ug/gm (ppm) at 11-11.5 feet to 65.0 ug/gm (pplit) <br /> 50.0 ug9m (ppm) at 11- <br /> feet. Total hydrocarbons ranged at from205-21tEthylene <br /> 11.5 feet to 1400.0 ug/gm (pP ) at <br /> Dibromide (EDB) concentrations rm) at 20ed .5- 210feet. Theother <br /> 11-11.5 feet to 2.10 ug/gm (pP <br /> three borings also contained organic cOmendixsC,ln the sail <br /> above the detection limits as shown in App <br /> On Februa_y 11, 1987 water samples were obtained after purging <br /> leaned about three well volumes- Asamplesccollectedacrylic <br /> placed <br /> were sealed and put in <br /> down the well and the <br /> cold storage. The fuel concentrations in MW-2 and MW-1 whad <br /> ere <br /> .found to be the highest. The water in mOtvluenegat 22.0 ug/ml, <br /> of Benzene at 18.0 ug/ml (PPm) ' ue hydrocarbons at <br /> levels ml and total gasoline <br /> total xylenes at 3.3 ug/ ml in M44-2, <br /> 200.0 ug/ml. EDB ranged from 0.20 ug/ml to 0.32 ug/ <br /> and total lead was 0.19 mg/kgm• <br /> The water samples taken from v;q-1 had concentrations of benzene <br /> - ml,- _total-xylenes at 5.6 <br /> at 22.0 ug/ml,---- toluene-at- 20.0.-ug _ EDB was -- <br /> ug/mi <br /> as-- - - _--- - - - - ----- <br /> ug/ml and total gasoline hydrocarbons at 150.0 ug/ml -- <br /> 3 <br />