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.- _ ,'�"', sr.cY ^"� 'i?t'-j.u•_ ��� r�na,� _ r-.� a.-.�u'�tM1- - - e'er' .,s9-R' "2 <br /> L <br /> iZ <br /> QUARTERLY GROUND WATER <br /> MONITORING AND SAMPLING REPORT <br /> for <br /> Former obil Service Station <br /> 2375 Tracy Boulevard 10 NP4 <br /> Tracy, California <br /> November 26, 1991 <br /> INTRODUCTION <br /> report presents the results and findings of the <br /> This r <br /> Jure epo quarterly ground water monitoring and sampling <br /> ence at former Mobil Service Station <br /> performed by Alton Geosci <br /> 10-NP4, 2375 Tracy Boulevard, Tracy, California. The site <br /> vicinity map is shown in Figure 1 and a site plan is shown in <br /> Figure 2. <br /> PROJECT BACKGROUND <br /> The former Mobil Oil seriocatedaat 2375tion tTracy e is pBoulevara <br /> d <br /> Bp Oil Service Station, <br /> Tracy, California. <br /> In August 1986, four underground storage tanks were removed <br /> moved <br /> from the site by Kaprealian Engineering, Inc, (NEI) • <br /> grab samples of water collected from the gasoline tank <br /> ytical <br /> excavation cavity were <br /> comwateresampleaindicadted thepresence <br /> result le Inde {TPH-G) at a <br /> of total petroleum hydrocarbons as g Benzene, <br /> f concentration of 30 parts constituentser million (were.detected at <br /> toluene, and xylene { and 5.3 ppm, respectively. <br /> concentrations of 1.6, 3.0, <br /> ne soil sample collected from the w <br /> Analysis of oall of the <br /> waste oil tank excavatio cgTZtconstituents3, polychlorinated <br /> concentrations of 61 pp <br /> biphenyls (PCBs) and halogenated volatile organic limits s <br /> (HVOC) were not detected above reported detection limits at <br /> f a soil sample collected from the <br /> that time. Analysis o <br /> excavation area of the gasoline <br /> nd BTX Ponccentrationsrevealed <br /> a <br /> roduct line of0.22r0.34, <br /> concentrations of 2 ppm <br /> and 0.29 ppm, respectively. <br /> REI installed four <br /> Following tank removal and replacement, KW-3 and <br /> ground water monitoring wells onsite (MW-1, MW-2, ' <br /> WI-4) , Ground water sample analysis samples MW-3tandyMWs4 <br /> of hydrocarbon constituents in the camp round <br /> only. ;n Jan,iary 1987, NET installed and MW-8) atthe <br /> water monitoring wells (MW-5, MW-6, MW-7, additional g <br /> the <br /> - - <br /> __--site. Analysis of soil samples col'_ected during <br /> l e s from <br /> - -- ------ ----- _-- - ---- --- <br /> ------------- <br /> additional well construction detected--TPH-G Concentra ions <br /> up to 24 ppm, while analysis of ground water camp <br /> 1 <br />