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The Transmission Store - 2 - 11 April 2013 <br /> 515 W. Charter Wy., Stockton <br /> San Joaquin County <br /> configuration with written SVE/AS system optimization recommendation(s). I suggested that <br /> AGE provide a cost comparison between conducting a limited in-situ chemical oxidation (ISCO) <br /> injection versus the two additional AS wells, and include a geologic cross-section to show <br /> current plume distribution. The Email included an attached geologic cross section showing the <br /> groundwater plume located between 30' bgs and 60' bgs. The Email stated the cost for the two <br /> shallow screened 45' bgs AS wells would be $7,000 to install and plumb into the existing <br /> treatment system, versus the $7,500 to $8,500 to conduct an ISCO pilot study and remediation. <br /> Temporary batch groundwater extraction from MW-7S was rejected due to the high cost of the <br /> groundwater disposal. <br /> By 30 April 2013, please submit a workplan to install the two additional air sparge wells and, <br /> upon receipt of my workplan approval, install and plumb the new wells by 30 June 2013. <br /> Continue air sparging in the interim. Submit the remediation status report with <br /> recommendations as necessary in the semi-annual groundwater monitoring report by <br /> 30 July 2013. You are also to provide monthly email status reports by the 15th of each month <br /> (May 15th, June 15th, etc.) on the progress towards modifying the SVE/AS treatment system until <br /> further notice. If you have any questions, you may call me at (916) 464-4615 or email me at <br /> ibarton(aD-waterboards.c--a--.goov--. <br /> i <br /> /James L. L. Barton, P.G. <br /> Engineering Geologist <br /> cc: Nuel Henderson, San Joaquin County Environmental Health Department, Stockton <br /> William Little, Advanced GeoEnvironmental Inc., 837 Shaw Rd., Stockton 95215 <br />