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000 _ <br /> CLEARWWER <br /> G R O U P <br /> Fvvirovpnevnvi services <br /> tert-amyl methyl ether [TAME] , and tert-butanol [TBA]), and the lead scavengers, ethylene <br /> dibromide, and 1 ,2-dieloroethane. <br /> Clearwater is scheduled to gauge and sample the wells on February 17, 18, and 19, 2009. <br /> Clearwater will notify the EHD if any significant developments occur during the sampling <br /> process . <br /> Low—Flow Purging <br /> The EHD has tentatively approved the use of the low-flow (minimal-drawdown) method at the <br /> site. To document that the change in procedures is acceptable and at the request of the EHD the <br /> low-flow technique will be used initially followed by purging of three well casings from each <br /> well and sampling. Clearwater will then analyze the two samples collected from each well for the <br /> contaminants of concern. If the results are comparable, future sampling will be done utilizing <br /> the low-flow procedures. <br /> Recommendations <br /> Clearwater recommends that the groundwater monitoring and Operation and Maintenance <br /> (O&M) program (as modified by EHD in their letter dated December 23, 2008) be initiated and <br /> evaluated after one year to assess whether modifications are warranted or until closure can be <br /> granted by the EHD. In addition, Clearwater recommends adding wells DPW- 1 and AS4 to the <br /> quarterly sampling schedule in order to better define groundwater quality in the vicinity of these <br /> wells. <br /> If you have any questions please contact me at 510-307-9943 or by e-mail at <br /> msiembieda(a clearwatergroup.com <br /> Yours truly : gED Get <br /> S/E ��ci <br /> Clearwater Group 4 a`r,' <br /> Ww �✓� No: 4007 y <br /> ��lgrf orCAOi <br /> Michael L. Siembieda, PG - 4007 _a <br /> Senior Project Geologist <br /> Enclosure: Table 1 , Groundwater Sampling Schedule <br /> cc: Mr. Floyd Barnes, Barnes Trucking, 9744 Fountain Valley Drive, Stockton, CA 95209 <br /> Mr. James L . Barton, R. G., Central Valley Regional Water Quality Control Board, 11020 <br /> Sun Center Dr. , #200, Rancho Cordova, CA 95670-6114 <br /> ZB 178N 3 of 3 February 11 , 2009 <br /> Barnes Trucking Response to Regulator <br />