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February 20, 1992 <br /> Beacon Station No. 02, Manteca, California <br /> � rn e, r <br /> The ground-water 5:ui1pIC5 were anal`"Led g total petroleum tetho.dst 3030nns as and 8015 and <br /> (TPHg) tisilig Environtlterttal I'ratection Agency sornets ( iMethods <br /> benzene, toluene, ethylbenzenc, :tEld total xylene iAnalytical En� n•onnieTEX)using n a oin <br /> and Laboratories02. 'rhe satllples ��ere analyzed at App <br /> liedRancho Cordova. Californias(Hazardous a Waste sed Testing <br /> 3 o Concentrtory ations ans of TIPHgsand <br /> of these and previous analyses <br /> BTEX in samples <br /> collectedethods used,s NIW-1-with the xception of 0 0016 parts peramiilon total <br /> limits for the analyucal m <br /> xylene isomers detected in water sampled from well ;%IW-2. <br /> Work in Pra rens <br /> �.'. the request of Ultramar hic., +%e are curre[ill) preparnig a work plan for further <br /> assessment at the site. The work lan ���i»ge�itolE monitole ring wells ation Andntlnk Ecavity. <br /> tional onThe <br /> monitoring well downgradient of <br /> additional well will be instal the ed t ground evaluate ter underler p <br /> ly'ing the site <br /> esandt detected more accurately <br /> hydrocarbons are still present u g <br /> measure the direction of groundwater flow and gradient. <br /> round-Water Gradient <br /> On October 14. 1991, A geologist from RESNA was at the site to measure tarby he depths <br /> ix the <br /> water in the three onsite wells (Table ty.a (`Gablend sr 5)e and to osulrveyethe loca ions of the <br /> north, formerly a Jackpot gasoline <br /> offsite wells. The locations f tl ti ethe <br /> lf toeorsilte well ls atshown oil <br /> usling a Leitz/Sokk positionsof <br /> C;3E <br /> _ offsite wells were surveyed <br /> automatic level. The water <br /> levels <br /> Ithet water level Survey tmeasured a were ei�t toffsiteu vent�11V-St which[ss <br /> gradient, with the excep <br /> located in a former tank cavity. This measurement was <br /> round avateQ gradnent on October <br /> construct the potentiometric Surface \lap, Plate 3. g on <br /> -te of <br /> 14. 1991, was towards the northeast QatlQ11 Oct gradient <br /> 14199 , wiss ll be0used to locate,0004. as shown <br /> plate 3. The gradient data collected <br /> proposed additional well. <br /> __ --—1147kcar <br /> Sb10:-6 <br />