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California Tank Lines, Inc. Page 4 <br /> 3105 South EI Dorado Street August 17, 2011 <br /> Stockton, California 95206 <br /> If the results from the model are favorable for MNA, Taber proposes to prepare a site-specific, <br /> long-term monitoring plan. <br /> The EHD will not approve long-term monitoring for MNA at this site. Although Taber has <br /> evaluated the use of pump and treat (groundwater extraction) and concluded that the <br /> "anticipated high costs, the limited effectiveness on mass removal, and the absence of down- <br /> gradient sensitive receptors" would not merit the implementation of this remedial method, the <br /> EHD recommends that groundwater batch extraction be tested using MW-4 to remove <br /> groundwater. Batch extraction has had some success in San Joaquin County for reducing <br /> limited hot-spots. If your consulting firm concurs with this recommendation, please submit a <br /> work plan to the EHD by 20 October 2011, to perform pilot test batch groundwater extraction. <br /> Should you have any questions or concerns regarding this letter, please contact Vicki <br /> McCartney at (209) 468-9852, or by email at vmccartney@sjcehd.com. <br /> Sincerely, <br /> Victoria L. McCartney, REHS Nuel C. Henderson, Jr., PG <br /> Senior Registered Environmental Health Specialist Engineering Geologist <br /> c: Mr. Thomas Ballard, PG, Taber Consultants, 3911 West Capitol Avenue, West Sacramento, <br /> California 95691 <br /> Mr. Guy Roy, Environeering, Inc, Post Office Box 2498, Danville, California 94526 <br /> Mr. James L.L. Barton, PG, California Regional Water Quality Control Board Central <br /> Valley Region, 11020 Sun Center Drive, Suite 200, Rancho Cordova, California 95670 <br />