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4� <br /> 0 <br /> 0 ///7AEX 11244 Pyrites Way - Gold River,CA 95670 <br /> E N V I R 0 T E C H , I N C Phone 916 8510174 • Fax 916 8510177• Toll Free 1 800 242 5249 <br /> July 22, 2005mo (� (��/]j� <br /> Mr Michael Infurna Jr �VTWE l�D <br /> San Joaquin County Environmental Health Department JUL 2 5 2005 <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, California 95202-2708 ENVIRONMENT HEALTH <br /> PERMIT/SERVICES <br /> Subject Workplan for Preliminary Site Assessment <br /> (Monitoring Wells) Addendum <br /> Flag City New West Station #1003 <br /> 6437 W Banner Avenue, Lodi, California J <br /> Apex Project # NWPO1 004 <br /> Dear Mr Infurna <br /> Apex Envirotech, Inc (Apex) has been authorized by New West Petroleum (NWP) to submit this <br /> workplan in response to the San Joaquin County Environmental Health Department (SJCEHD) <br /> • letter dated July 15, 2005, regarding the above referenced site (Figure 1) This workplan details <br /> the installation of six monitoring wells (4 first zone and two second zone wells) A copy of the <br /> SJCEHD Ietter is included as Appendix A All proposed work will be conducted in accordance <br /> with the Apex standard operating procedures (SOP) included as Appendix B This workplan has <br /> been prepared to determine the lateral and vertical extent (if any) of the petroleum hydrocarbon <br /> and oxygenates detected in groundwater at wells from a downgradient site from the subject site <br /> (Figure 2) <br /> This workplan has been developed, in part, on the basis of information obtained by Apex from <br /> NWP and is subject to modification as newly acquired information may warrant <br /> BACKGROUND <br /> February 3, 2005 — Advanced GeoEnvironmental, Inc (AGE) submitted a Quarterly Report- <br /> Fourth Quarter 2004, on behalf of the Chevron station located at 6121 Capitol Avenue This <br /> report states that the methyl tertiary butyl ether (MTBE) present in groundwater monitoring wells <br /> MW-8A, MWA 9A, and MW-20A could be from the New West Station #1003 <br /> March 2 2005 — The Central Valle Regional Water <br /> Y g Quality Control Board issued a Ietter <br /> concurring with AGE's fourth quarter monitoring report suggesting the MTBE detected in <br /> groundwater monitoring wells MW-8A, MW-19A, and MW-20A at the Chevron station may be <br /> the responsibility of NWP <br /> March 3, 2005 — An Underground Storage Tank (UST) Unauthorized Release Form was prepared <br /> by the SJCEHD for the NWP site <br />