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�a <br /> QUARTERLY GROUND VAXER <br /> MONITORING AND SAMPLING REPORT <br /> for <br /> Former Mobil Service Station 10-NP <br /> 4 <br /> 2375 Tracy Boulevard <br /> Tracy, California <br /> I,QTRdOUCTIDN <br /> the third <br /> This report presents the results c.nd findings °activities <br /> quarterly ground water monitoring and sampling <br /> performed on February 25, 1991 by Alton Geascience, Inc. <br /> Statat former Mobil Service <br /> alifornia�onThe-site v-.ciniaa3 <br /> ymapis is <br /> Boulevard, Tracy, C 1. <br /> presented in Figure <br /> PROJECT BACKGROUND <br /> s presently a <br /> The former Mobil oil <br /> la located atrvice ation site 2375 TracyiBoulevard, Tracy, <br /> oil service <br /> t'alifornia. <br /> four underground storage Ia� ( <br /> ksKEI ).re <br /> oved <br /> IAugust 1986, Three <br /> from the site by Kaprealian Engineering, tical <br /> grab samples of water collected from the ga`. yline tank <br /> excavation cavity were composited and analyzed. thelpresence <br /> results of. the composited water same <br /> lq of Total Petroleum Hydrocarbons , toluene,solinandH <br /> Benzenee, xylene (BTX) <br /> concentration of 30 Qpm. <br /> and <br /> c.3 ppm, respectivelts were y crAnalysiscon <br /> Ofnonetsoil sampleions of lcollected <br /> 5.3 ppm, <br /> from the wall of the waste oil tank excavation BTXv.�ty <br /> resulted in TPH -G concentrations of 61 pp <br /> polychlorinated hlorinated biphenyls (PCBs) and <br /> were not <br /> halogenated volatile organic compounds (HVOC) <br /> detected above reported detection limits at that time. <br /> Analysis of a so"samPllinelrevealedlected }TPHom tGeconcentrations excavation eof <br /> of the gasoline p 0,34, and 4.29 ppm, <br /> 2 ppm and BTX concentrations of 0.22, <br /> respectively. <br /> Following tank removal and replacement, KEI stalrleed3four <br /> ground water monitoring wells onsite ( - <br /> Ground-waters.-... analysis detected concentrations <br /> - - --. <br /> of hydrocarbon constituents in the samples from MW-3_...and <br /> only, In January 1987, KEI installed four aadditio)al ground <br /> the <br /> water monitoring wells (MW-5, :iW-6, MW-le <br /> site. Analysis of soil samples collected during the <br /> 1 <br />