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SECOR <br /> lisle rraatioiial Iricoiporated <br /> JN 40007-088-01 <br /> June 4, 1997 <br /> Mr. Michael Whelan <br /> ARCO Products Company <br /> 704 228`h Avenue <br /> Redmond, Washington 98053 <br /> PHASE II ENVIRONMENTAL SITE ASSESSMENT <br /> Proposed AM/PM Facility#YWNE <br /> 2470 West Grant Line Road <br /> Tracy, California <br /> Dear Mr. Faust: <br /> At your request, SECOR International Incorporated (SECOR) has prepared the following "Phase <br /> II Environmental Site Assessment" report. This investigation was performed in accordance with <br /> the instructions received from ARCO Products Company (ARCO). The objective of this <br /> investigation was to evaluate the possibility of petroleum fuel hydrocarbons in soils and <br /> groundwater underlying the site from previous onsite or off-site operations. <br /> The subject property has been vacant and undeveloped since at least 1968. From approximately <br /> at y <br /> 1979 through 1994, however, portions of the property appear to have been used as a temporary <br /> parking area for large trucks (refer to Appendix E, Aerial Photograph). Leaking underground <br /> storage tanks (USTs) have been reported at two nearby sites to the southwest (upgradient). <br /> A brief discussion of the investigation findings is presented in the following summary: <br /> SUMMARY <br /> Gasoline, benzene, toluene, ethylbenzene and total xylenes (BTEX) and methyl-tert butyl ether <br /> (MTBE) were not reported by the laboratory above method detection limits in the soil or <br /> groundwater samples collected and analyzed during this investigation. Groundwater samples were <br /> also nondetect for volatile organic compounds. <br /> Diesel fuel, total recoverable petroleum hydrocarbons (TRPHs) and total recoverable oil and <br /> grease (TROG), in varying concentrations, were detected in three of the seven borings completed. <br /> Reported concentrations ranged from nondetect to 52 mg/kg TROG. <br /> Dissolved phase diesel fuel was reported in groundwater at the locations of two of the four <br /> groundwater monitoring wells installed. Peak diesel concentrations were reported at 2.0 milligrams <br /> per liter(mg/L) at the location of MW-l. <br /> JN 40007-088-01 <br /> I1 ig4i isw\97-OGj w i\arc o frac.doc <br /> 25864-F Business Center Dr it e, Redlands, CA 92374-4515 (909)3.35-6116 (909)335-6120 FAX uvu,te.secor.com <br />