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Since submitting the original work plan for the installation of MW- 17 & MW- 18 using the hollow <br /> stem auger method, it has been recommended due to the overall depth of these wells that the <br /> mud rotary drilling method and setting a conductor casing increases the chances of setting a good <br /> and functional well . The wells will be installed using centralizers spaced every 30 feet. The sand , <br /> bentonite and grout will be installed using a tremie pipe. <br /> In response to the collection of air samples during the Soil Vapor Extraction test; this will be <br /> accomplished with a hand held Mighty-Vac vacuum pump to pull samples from the active flowing <br /> vapor stream on the down hole side of the SVE system . New poly tubing is put on the pumps <br /> influent and effluent ports prior to each sample event. The pump is also decontaminated with <br /> Alconox soap and clean water. <br /> Yours truly, g1 RE0 <br /> C&%P <br /> Jo�en No. Gr500 <br /> RG #6506 <br /> DISTRIBUTION <br /> Velma Masterson , Beneto, Inc. CALIFRAN�P <br /> RWQCB, Rancho Cordova, CA <br /> 2 <br />