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' • GEOTECHNICAL <br /> NEIL O. ANDERSON ENVIRONMENTAL <br /> �( <br /> PM <br /> AN D ASSOCIATES INSPECTIONS 6 TESTING <br /> 2005 NAR -7((]] PM 12: 11 LABORATORY SERVICES <br /> POOL ENGINEERING <br /> SAN JO AOUiN CpUPdTy POST TENSION DESIGN <br /> ENVIRONMENTAL <br /> HEALTH DEPARTMENT <br /> March 3, 2005 <br /> Mr. Tim O'Brien <br /> Central Valley Regional Water Quality Control Board <br /> 11020 Sun Center Drive#200 <br /> Rancho Cordova, California 95679-6114 <br /> RE: Response to Comments Dated Feb. 16, 2005 <br /> Regarding Replacement of MW-3 <br /> Chinchiolo Stemilt California, L.L.C. <br /> Dear Mr. O'Brien, <br /> Neil O. Anderson and Associates, Inc. (NOA) has today received your 16 February 2005 <br /> comments regarding replacement of MW-3 at the referenced facility. Our letter requesting <br /> well replacement was sent to you immediately after submittal of the "Monitoring Well <br /> Construction Report" (MWCR), however it is obvious from your comments that the <br /> information in the MWCR was not available to you during your review of our request for well <br /> replacement. I apologize for the oversight. <br /> In response to your 16 February 2005 comments, I offer the following responses: <br /> (1) The copy of the well construction log for MW-3 is attached. Please reference the <br /> MWCR for any other information you may need for that well. <br /> (2) The proposed method used to remove sediment from the base of MW-3 consists of <br /> inserting a tremie pipe to the base of the well and pumping potable water through the <br /> tremie pipe such that sediment will be `jetted' or `washed' out of the well. The well is <br /> very low yield, so addition of water will be necessary. A submersible pump may also <br /> be used to remove muddy water if appropriate. The tremie pipe will be progressively <br /> lowered as sediment is removed. <br /> (3) A "neat bentonite" is not proposed as well grout for MW-3. A "neat bentonite grout" is <br /> proposed for abandonment of MW-3. The "neat bentonite grout" consists of Portland <br /> cement mixed with 5 to 10 gallons of potable water for each 94 lbs bag of cement, and <br /> up to 5% by weight of bentonite is added to the mixture and thoroughly hydrated in <br /> order to control shrinkage in the cement grout. <br /> (4) Well MW-3 was professionally surveyed for horizontal location and vertical elevation <br /> after installation. The summary table showing well elevations and location included in <br /> LODI • SACRAMENTO • MODESTO <br /> ENVIRONMENTAL DIVISION 902 Industrial Way•Lodi,California 95240-209.367.3701 •FAX 209.369.4228•www.noanderson.com <br />