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0 <br /> Former George's Service Page 2 <br /> 1600 Durham Ferry Road November 14, 2011 <br /> Tracy, California 95376 <br /> In Phase Il, conditioned on more monies becoming available, GTI proposes to: <br /> • Continue the Phase I operations; <br /> • Add monitoring wells MW-1, MW-4, MW-5, MW-8 and MW-106 to wells SW-101 and <br /> MW-7 for annual sampling and monitoring; <br /> • Install three additional air sparge points, AS-1 through AS-3, to a depth of 25 feet <br /> below surface grade (bsg), as proposed in the RAP; <br /> • Collect up to nine soil samples for analysis of total petroleum hydrocarbons as <br /> gasoline (TPH-g) and benzene, toluene, ethylbenzene and total xylenes (BTEX), <br /> while installing the air sparge points; and <br /> • Install a low vacuum soil vapor extraction (SVE) system on-site as described in the <br /> RAP. <br /> GTI stated that prior to depleting the $10,000 allocated by the Cleanup Fund (CUF) for the <br /> 2011/2012 fiscal year, if the responsible party is not willing to incur cost beyond the monies <br /> allocated, then GTI will cease all activity until additional funding is made available through the <br /> CUF. <br /> The EHD approves the Phase I .proposals as presented above, except the EHD does not <br /> consider it necessary to monitor arsenic and hexavalent chromium in the groundwater. If, <br /> however, the CRWQCBCVR requires this for the WDR, then the EHD will concur with their <br /> directive. The EHD assumes that GTI will operate the air sparge system for one year, as <br /> proposed In the RAP. <br /> Prior to commenting on the Phase 11 proposals, the EHD directs that you submit a cost <br /> analysis for operating a portable SVE system at this site using existing wells. Submit the <br /> estimated costs to the EHD by 31 December 2011. <br /> If you have any questions, please contact Vicki McCartney at(209) 468-9852 or by e-mail at <br /> vmccartney5sicehd.com. <br /> Sincerely,Victoria L. McCartney, REHS Nuel C. Henderson, Jr., PG <br /> Senior Registered Environmental He Ith Specialist Engineering Geologist <br /> c: Mr. Raymond I. Kablanow, ll, PhD, PG, Geological Technics Inc., 1172 Kansas <br /> Avenue, Modesto, California 95351-1526 <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 />