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10 INTRODUCTIO <br /> Clayton Em ironrnental Consultants, Inc was retained by Intcriantl Coil) ,ration <br /> to supervise the excavation and aeration cit petroleum hydrocarbon t_ontaminatcd <br /> soil at 8715 West Grant Line Ro��d in Tracy, Calitornia (Figure 1) This projeLI <br /> was authorized by Mr Don I ewis, Intcrland VIce president, by accepting Clayton ti <br /> Proposal No 90-B-117, elated May 20, 1990, and a supplement Proposal <br /> No. 29531 00, dated August 20, 1990, with tbeir accomp�inying terms and <br /> conditions <br /> The purpose of this project was to rLmcdiate the soil thruugh cxf-avation and <br /> aeration, and to contirm the satislactory results with sampling and analysis The; <br /> site was restored by returning the aerated soils to the excavation pit and <br /> compacting them F.--Id work was completed in the week ending October 21, <br /> 1990 <br /> 20 S_TI �INYESTIGATI.ON <br /> Work at the subject s,te began in January 1990 when Orchard Sapply Hardware <br /> (OSH) contracted Clayton to conduct a Phase I environmental assessment at this <br /> site This assessment was performed to conduct a due diligence environmental <br /> investigation of the site prior to its transfer to OSH. The assessment revealed <br /> that an underground storage tank (UST) which contained gasoline was operated <br /> onsite and was removed in 1906 Clayton subsequently installed three monitoring <br /> wells Soil and groundwater samples were collected from these wells. The <br /> analytical results of soil samples taken trorn the monitoring well bore holes are <br /> summarized in Table 1 below <br /> Tab:e 1 <br /> Monitoring We Soil Sample Ana "cat Results <br /> 34W-t MVS-1 XW-2 W,-2 UW4 AW3 L,st or <br /> tliueilt 1I` s' 10� IF Ilt Dezoatlae <br /> iF81 "►gam 1�811tat !sem uIl t•8*1 <br /> 8020 Benzene ND* ND ND ND ND ND 5 <br /> Toluene 10 ND ND ND 40 50 5 <br /> Xylenes ND ND ND ND 460 730 5 <br /> Ethylbenzene ND ND ND ND 350 330 5 <br /> 8015 TPH° as ND ND ND ND 60,000 68 000 2 000 <br /> Gasoline <br /> 4181 oil and Grease 20 30 70 ND :TM0 70 10 <br /> and Recoverable mg/kg mg/kg mg/kg mg/kg "g mg/kg mg/kg <br /> Hydrocarbons <br /> Soso Qrganochlonne ND ND ND ND ND ND Vanables <br /> L'esLCldes/YCBs <br /> of etecte, <br /> TPH = total petroleum hydrocarbons <br /> PCB = polychlorinated biphenyls <br /> -1' <br /> *951]w RF <br /> F <br />