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Former Georges Servo Page 2 <br /> 1600 Durham Ferry Road 16 October 2008 <br /> Tracy, CA 95376 <br /> and submitted WP to acquire the data. GTI proposed to advance up to 15 geoprobe <br /> borings to a maximum depth of 40 feet below surface grade and collect soil and <br /> groundwater samples to refine the delineation of impacted soil and groundwater and the <br /> distribution of the contaminant mass. The EHD approves WP as necessary and <br /> adequate, but recommends that an additional boring be advanced near the proposed <br /> location for air sparge well AS-10 to assess the plume of impacted groundwater in that <br /> area. The EHD will not comment further on the ORC Advanced injection proposal <br /> pending receipt and review of the results of the geoprobe investigations and the ensuing <br /> recommendations from GTI. <br /> In GWMS GTI proposed to reduce the sampling frequency from quarterly to annually for <br /> monitoring wells MW-3, MW-6, MW-2X, MW-101, MW-105, MW-102, MW-107, MW-201, <br /> and MW-202, and domestic wells DW-31448 HWY 33, DW-1600 D.F. and DW-1697 <br /> D.F. The EHD approves this proposal except for monitoring well MW-107 and the <br /> domestic wells. Continue to sample the domestic wells quarterly and monitoring well <br /> MWA07 semi-annually. <br /> Questions or comments may be directed to Nuel Henderson at (209) 468-3436. <br /> Nuel C. Henderson, Jr., PG Marga�rio, RENS <br /> Engineering Geologist Program Coordinator <br /> c: J. Barton, PG—CVRWQCB, 11020 Sun Center Dr. #200, Rancho Cordova, CA 95670 <br /> R. Kablanow, PG —Geological Technics Inc., 1101 Seventh St., Modesto, CA 95354 <br /> WP Approval Letter 101608.doc <br />