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PACIFIC <br /> ENVIRONMENTAL <br /> GROUP INC. <br /> July 17, 1996 <br /> Project 320-135.7C <br /> Mr. Brett Hunter <br /> Chevron Products Company <br /> P.O. Box 5004 <br /> San Ramon, California 94583-0804 <br /> Re: Corrective Action Plan Addendum <br /> Chevron Service Station 9-6171 <br /> 6633 Pacific Avenue at Benjamin Holt Drive <br /> Stockton, California <br /> Dear Mr. Hunter: <br /> Pacific Environmental Group, Inc. (PACIFIC) has been perfonning environmental services <br /> at the referenced site on behalf of Chevron Products Company (Chevron). One compo- <br /> nent of these services has been the preparation of a Corrective Action Plan (CAP) dated <br /> .April 4, 1995. Comments regarding the CAP were received from San Joaquin County <br /> Public Health Services, Environmental Health Division (PHS/EHD), modifications were <br /> made, and a revised CAP was issued on June 29, 1995. In a letter dated April 23, 1996, <br /> PHS/EHD requested an addendum to the revised CAP in order to provide clarifications <br /> regarding several issues related to groundwater monitoring at the site; these issues were <br /> presented in a letter from PHS/EHD dated April 11, 1996. This CAP addendum has been <br /> prepared in order to address the comments presented in the April 11, 1996 letter. <br /> In the April 1 l, 1996 letter, PHS/EHD requested: (1) that all groundwater samples be <br /> analyzed for MtBE for at least one additional groundwater monitoring event; (2) a <br /> summary of well construction details and an evaluation of the current monitoring capabili- <br /> ties; and (3) a list of parameters that would be used to monitor the remediation through <br /> natural processes. Each of the issues of concern and an explanation addressing each issue <br /> are presented below. <br /> Issue 1: The grotm healer samples collected on November 5, 1995 did not undergo <br /> A11BE• analyvi.v. Please note that general!), fivo roundv of analysis are neces.vw), to <br /> co??firm analytical results; therefore, the next round of samples collected should undergo <br /> A4tBE analyvis. <br /> Groundwater samples will be analyzed for MtBE, this analysis began with the May 12, <br /> 1996 groundwater monitoring event. During the May 12, 1996 event, no MtBE was <br /> 2025 Gateway Place, Suite 440, San Jose, California 95110 (408)441-7500 FAX (408) 441-7539 . <br />