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I <br /> Mr. Carl Navarra L) <br /> Page 2 of 2 <br /> 7500 W. Eleventh Street <br /> Tracy, CA 29 June 2009 <br /> samples for laboratory analysis. The EHD approves the proposed boring locations and sampling <br /> methods, but does not believe soil samples need to be submitted for laboratory analysis, the <br /> samples will be useful be ensuring that the water samples are collected from the proper strata. <br /> The groundwater samples need only be analyzed for MTBE to complete the assessment of the <br /> MTBE plume. <br /> To comply with the recent State Water Resources Con#rol'Board Resolution 2009-0049, the ' <br /> EHD approves sampling your monitoring wells on the following schedule: <br /> • Semi-annually -- MW-3, MW-4, MW-7, MW-13, MWFP-1, MWFP-2, MWFP-3 and <br /> MW FP-4; <br /> • Annually — MW-2, MW-5, MW-6, MW-10, MW-11, MW-14, MW-17, MW-18, and <br /> MW FP-5; <br /> • Biennially— MW-1, MW-8, MW-9, MW-12, MWA5 and MWA6; and <br /> • Discontinue sampling MW-3A, MW-3B and MW-12A. 1 <br /> I <br /> If needed to evaluate the effectiveness of the remediation effort, some wells can be sampled <br /> more frequently if requested with technical justification. <br /> If you have any questions or comments you may contact Nuel Henderson, Engineering <br /> Geologist at (209)468-3436. <br /> Sincerely, <br /> Nuel C. Henderson Jr. PG Mar La orioH�S� <br /> , gar 9 <br /> Engineering Geologist Program Coordinator <br /> c: Mr. James Barton, CVRWQCB, 11020 Sun Center Dr. #200, Rancho Cordova, CA 95670 <br /> Dr. Dai Watkins, TSJCI, 1120 Hollywood Ave., Ste 3, Oakland, CA 94602 <br /> i <br /> I <br /> I <br /> Work Plan Approval Letter 0609 <br /> I <br />