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URS <br /> Mr. Harlin Knoll <br /> San Joaquin County Environmental Health Department <br /> September 7, 2005 <br /> f <br /> f <br /> Permitting <br /> The SJCEHD requires that permits be obtained prior to the abandonment of wells. The City of Tracy <br /> requires encroachment.permits to conduct drilling on City property. URS will submit the appropriate <br /> permit applications and fees to SJCEHD and the City of Tracy prior to conducting field activities. <br /> Utility Clearance <br /> Well locations will be clearly marked and Underground Service Alert (USA) will be notified a <br /> minimum of 48 hours prior to commencement of field activities. 1n addition, a private utility location <br /> company will survey the site for buriedutilities, and the first 5 feet below ground surface (bgs) at each <br /> well location will be hand cleared with either an air or water knife to a diameter of 10 inches <br /> (monitoring wells ATR-1 through ATR-4 and ATR-8 through ATR-12) or 12 inches diameter <br /> (monitoring wells ATR-5 through ATR-7)prior to abandonment activities. <br /> Well Abandonment Methods <br /> The 12 groundwater monitoring wells (ATR-1 through ATR-12) will be properly abandoned by a <br /> licensed drilling contractor under the direction of a URS geologist..The well locations are presented on <br /> Figure 2 and well construction details are presented in Table 1. <br /> Nine of the 12 monitoring wells (ATR-1 through ATR-4 and ATR-8 through ATR-12) will be <br /> abandoned by pressure grouting with a Portland cement grout containing less than 5% bentonite <br /> powder, then over-drilling to 5 feet bgs with 10-inch outside-diameter (OD) hollow-stem augers and <br /> filling with a Portland cement grout containing less than 5% bentonite powder to near surface. The <br /> remaining three monitoring wells (ATR-5 through ATR-7) will be abandoned by pressure grouting with j <br /> a Portland cement grout containing less than 5% bentonite powder then over-drilling to 5 feet bgs with <br /> 12-inch OD hollow-stem augers and filling with a Portland cement grout containing less than 5% <br /> bentonite powder to near surface. Surface completions will consist of concrete that will be finished <br /> flush to the surrounding ground surface. <br /> Report Preparation <br /> Following completion of the field activities a report will be prepared documenting well abandonment <br /> activities. <br /> K:1WprocessU5 BP ARCO%02093%Well Destr12093 Well Destruction WP 05Aoc <br />