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' 19 January 2004 • AGE-NC Pioject No 95-0130 ' Page 5 of 6 • The lateral and vertical extent of the dissolved petroleum hydrocarbon plume is not known ' towai d the not thwest, north, northeast, east and southeast of the ai ea bound by wells MW-1 through MW-7 (Figures 5 through 8) 5.0 RECOMMENDATIONS ' Based upon the results of the third quarter 2003 investigation, AGE recommends ' • Continued quarterly ground water monitoring of wells VW-1 (Band C), VW-2A, VW-3A, MW-6 (A-E) and MW-7 (A-E) The fourth quarter 2003 ground water monitoring event has ' already been performed on 10 November 2003, a first quarter 2004 ground water monitoring event is tentatively scheduled for 09 February 2004 • Conduct future ground water monitoring events concurrently with the Knowles/Rock ' Property site (102 South Wilson Way) and the Arco AM/PM site (130 South Wilson Way), • Continued quarter ly depth-to-water measurements in all monitor ing wells at the site, but �• reduced 1-11 ound water sampling frequency from a quarterly to a semi-annual program, AGE believes that contunued quarterly ground water sampling from these wells at this stage of the investigation is not cost effective and will not provide enough useful information to supplement the ongoing investigation Semi-annual sampling events should be adequate to monitor ground water impact at these wells and should be re-evaluated on a semi-annual basis An interim remediation work plan was submitted by AGE to the SJCEHD on 21 May2003,the work plan was approved by the SJCEHD on 10 June 2003 In accordance with the above work plan, AGE obtained a permit from the City of Stockton Public Works for discharge of Top Filling Station treated ground water to the sanitary sewer system, and a permit from the San Joaquin County Air Pollution Control District (APCD) to discharge air emissions (Appendix C) To date, the ground water remediation equipment has been installed at the site AGE is currently in ' the process of installing a new electrical service,through Pacific Gas and Electric(PG&E) AGE has applied for a City of Stockton building permit (i e electrical &plumbing) before completion of all underground trenching and piping AGE anticipates start-up of the Interim remediation system by March 2004 I Advanced GeoEnvironmen[ai,Inc I