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Ms. Luci, Thatei - :i 9 Nf rcl, 2006 <br /> b) Onsite storm water runoff accumulating around MWA on the asphalt surface (the pavement slopes <br /> towards the street) may be recharging the shallow aquifer through MW-1 and/or MW-4, or <br /> c) A leaking domestic water line/overly abundant landscape irrigation from the house to the west may <br /> be contributing to the water table mounding. <br /> All of the above conditions (or others not mentioned) may allow water to reach and mowed up the water <br /> table, providing atypical water level results for MW-1 and MW-4. Rather than requiring that you contact <br /> AGE to destroy/replace MW-1 or MW-4, or to investigate the source of the discrepancies immediately, <br /> 1 recommend that AGE first perform an expedited pilot study/interim remediation,to include an extended <br /> pumping test of MW-1, coupled with soil vapor extraction in the tank pit area,to mitigate the <br /> contamination in the source area and define the residual soil contamination as previously reported down to <br /> 40 feet depth in the tank pit in 1985 (TPHg, 1.93 milligrams per kilogram, or mg/kg; benzene, 0.296 <br /> mg/kg; ethylbenzene, 6.9 mg/kg; and xylenes, 27 mg/kg). <br /> The anticipated work is necessary and appropriate for the investigation and remediation of petroleum <br /> hydrocarbons released from the former USTs on your property. Please submit a Workplan to include <br /> these elements or an alternative technology expedited workplan by 14 April 2005 and a Report of the <br /> work including the mass of petroleum hydrocarbon constituents removed by 18 August 2006. Provide at <br /> least 3 working days notice to San Joaquin County staff and myself prior to commencement of fieldwork. <br /> You may call me at(916) 464-4615 or email me at jbarton@waterboards.ca.gov if you have questions or <br /> comments. - ' <br /> P�� <br /> James L. Barton, P.G. <br /> Engineering Geologist <br /> Enclosure <br /> cc: Mr. Harlin Knoll, San Joaquin County Environmental Health Services, Stockton <br /> Mr. John Chung, KEO #6 LTD PTP, P.O. Box 7249,Newport Beach, CA 92658 <br /> Mr. Robert Marty, Advanced GeoEnvironmental, Stockton <br />