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SECOR <br /> JN 40007-130-01 <br /> �• Q� lratersaatioractlhrcorporated <br /> June 6, 1997 <br /> Mr. Michael Whelan <br /> ARCO Products Company <br /> 704 2280'Avenue <br /> Redmond, WA 98053 <br /> PHASE II ENVIRONMENTAL SITE ASSESSMENT ADDENDUM <br /> Groundwater Monitoring Results <br /> Proposed AM/PM Facility#YWNE <br /> .--24-70 West Grant Line Road <br /> Tracy, California <br /> Dear Mr. Whelan: <br /> This letter should be considered as an addendum to SECOR's previous Phase II Environmental <br /> Site Assessment: Proposed AM/PM Facility#YWNE,Tracy, California, dated June 4, 1997. The <br /> purpose of this addendum is to provide additional groundwater information for the proposed <br /> am/pm facility located at 2470 West Grant Line Road, Tracy, California. A brief discussion of the <br /> additional findings is presented in the following summary: <br /> SUMMARY <br /> The initial groundwater survey, conducted on May 22, 1997, indicated that localized site <br /> conditions may have contributed to unexplained variations in water level readings. A new set of <br /> groundwater elevations were obtained from the monitoring wells at the site by SECOR personnel <br /> on June 5, 1997. This new information, gathered after an additional two week period, indicates <br /> that subsurface lithology caused an unevenly slow recharge of the wells that affected our initial <br /> field measurements. The water levels appear to have now stabilized and the results of the new <br /> data are outlined in the following table: <br /> 1N 4uV07.130-U1 ) <br /> Il,guusw'y'-UC>�U11 W11 AilAtiil dm <br /> 25864-F Business Center Drive,Redlands, CA 92374-4515 (909)335-6116 (909.)335-6120 FAX wu-msecor.cont <br />