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Y l,a.R.-�a"�G n'�r+p•,: 'ut c. - dna yr�+�a+r .;r :a:` c <br /> c$'s <br /> H <br /> SUMMARY AND CONCLUSIONSon <br /> and conclusions presented in this section are ebsummar'and <br /> ta <br /> The summary implementations; 2) <br /> ,� fltl wJrk imp. <br /> collected for and interpretations developed in this reP° <br /> resented in se 110r�E sail chemistry;and 4)water chemistry. <br /> conclusions are P dro eology; <br /> stratiig-raphy and by g <br /> Field Work Implementations at the GLI <br /> • Berr�een September 16-23, 1991, E5 advanced five ail borings <br /> Stockton, California. `Riese boreholts were utilized for soil <br /> Terminal in <br /> sampling locations• <br /> he highest ;lV measurement in each <br /> Soil samples were collected at five.noat i!lteg als during advancement nal the, <br /> boreholes with the sample displaying fes were yz <br /> borehole being submitted for chemical analysis. Soil same <br /> for TPHD,TPHG and BTEX. <br /> Three of the five soil borings were convert otentito alr <br /> contamination associated <br /> The wells were <br /> the UFST system.tructed to monitor p <br /> with past operations rnduct thickness, <br /> • Or. September 23, 1991, the wells ale monitored <br /> ua quality <br /> Samples were analyzed for <br /> depth to water and water quality. <br /> TpHD,TgHG and BTEX• <br /> Hydrogeology <br /> ' <br /> Site Stratigraphy and silts with moderate to well-sorted,fine <br /> • Subsurface materials consist of clayey <br /> - sand lenses. <br /> • <br /> Shallow groundwater underlying the site iloccc r feeder unconfined conditions. <br /> Groundwater was encountered at a dep hydraulic gradient of 0.002 Nft- <br /> " Groundwater flows to the south,with a <br /> • The site is 100 percent paved with asphalt/concrete recha g uid inhibit <br /> vertical and horizontal migration of contamination du <br /> Sail Chemistryles submitted for analysis. <br /> • 7TpHG was not detected in any of the samples from 500 (MW-3) to 6,800 <br /> ranging <br /> .1 pHp was detected cted TPHD at concentrat:ans g gation was <br /> The highest deteS found surface. from a sample <br /> ntr <br /> mg/kg(B-1). <br /> collected at a depth of 25.0 to 26.5 feet b g of the soil samples submitted <br /> Benzene and toluene were not detected in any <br /> for analysis. in from 7.2 (MW-2) to <br /> • Ethyibenzene was detected nes°Weretrations detected only gin sample r[VJ'3 ata <br /> ` 600 ug/kg (B-1). Tot XY <br /> -i concentration of 10 ug/kg. k •1•pH in suit samples to <br /> CB use a concentration,°f a DHS uses a concentration of 1,000 ; <br /> The RWQ i <br /> initiate groundwater investigations• <br /> Lmt4SY132.21/MRVO <br /> 1 <br /> s <br /> IM <br />