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' AIWG ERAGHTY <br /> AAV& MILLER, INC <br /> Environment and Infrastructure <br /> a heldemii company <br /> 1 October 9, 1997 <br /> Project No RC0309 010 <br /> tMs Mary Y Mea s <br /> San Joaquin County Public Health Services <br /> ' Environmental Health Division <br /> 304 East Weber, 3rd Floor <br /> Stockton, California 95204 <br />' (209) 468-0337 phone <br /> SUBJECT Addendum to Corrective Action Plan, Chevron Service Station#9-4275, 2905 <br /> West Benjamin Holt Drive, Stockton, California. <br /> Dear Ms Meays <br /> Geraghty&Miller is submitting this Addendum to Corrective Action Plan (CAP) on behalf <br /> g tY g <br />' of our client, Chevron Products Company (Chevron) for the above-referenced site (Figure 1) <br /> The original CAP was submitted by Geraghty& Miller on May 29, 1997 This Addendum has <br /> been prepared as requested by the San Joaquin County Public Health Services (SJCPHS) in a <br /> letter dated June 17, 1997, following its review of the above-referenced CAP This Addendum <br /> to CAP addresses the following <br /> 1) an assessment of hydrocarbon impacts on soil and groundwater, including a summary <br /> of lateral and vertical delineation of soil and groundwater as confirmed by the results of <br /> a vertical delineation soil boring, and an estimate of the mass of hydrocarbons in the <br /> g Y <br /> subsurface, <br /> 2) a discussion of the feasibility and cost-effectiveness of the installed SVE/air-sparging <br /> remediation system versus other possible corrective actions, an operational analysis <br />' demonstrating the effectiveness of the installed soil-vapor extraction (SVE) and air- <br /> sparging system, and <br />' 3) proposed clean-up levels for soil and groundwater at the site prior to the cessation of <br /> active remediation (interim goals), and long-term passive remediation goals to be <br />' achieved (drinking-water maximum contaminant levels [MCLs]) <br /> r � i <br />' 1050 Manna Way South•Richmond, California 94804 a(510) 233-3200 e FAX (510) 233-3204 �„�� <br />