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US <br /> Ms.Lori Duncan,REHS <br /> February 17,2006 <br /> Page 2 <br /> samples will be collected at 5-foot intervals during the drilling of the boring using a modified California <br /> split-spoon sampler. Soil samples will be used for lithology and screened with a photoionization <br /> detector (PID) for laboratory analysis. At least one soil sample from the boring will be submitted for <br /> laboratory analysis. A URS geologist will log the soils according to the Unified Soil Classification <br /> System. Total depth for the proposed monitoring well will be approximately 33-feet bgs. Depth to first <br /> water is approximately 22.5 feet bgs. <br /> The monitoring well will be constructed using 2-inch OD, schedule-40, flush-threaded poly-vinyl <br /> chloride (PVC) well casing. The well will be constructed with 15 feet of 0.020-inch slot screen set <br /> across the water table, so that 10-feet of screen is submerged below the water. A Monterey No. 3 silica <br /> sand filter pack(sand), or equivalent, will be installed from 6 inches below to 3 feet above the screen. A <br /> 2-foot bentonite seal will be installed atop the sand, and grout will fill the remaining annular space to <br /> the surface. The monitoring well will be completed at the surface with a traffic-rated flush-mount well <br /> box set in concrete. The exact screen interval will be determined in the field by the URS geologist. Well <br /> completion details will be presented on the boring log. <br /> A minimum of 72 hours after installation, the monitoring well will be developed by rigorously surging <br /> over the length of the screen interval and by purging a minimum of 10 casing volumes of water from the <br /> well. Sampling of the well will be conducted during the scheduled quarterly event. <br /> If you have any questions or comments regarding this workplan, please call Mr. Vernon Elarth at (916) <br /> 679-2299. <br /> Sincerely, RED GE0�0 <br /> URS Corporation Americas ?AUL F�9 Q/. <br /> /k_ No. 12 < <br /> Margaret Hogaboom * EXp' 131 Vernon Elarth,R.G. <br /> Staff Geologist &I � Project Manager <br /> Attachments: Sheet 1, Site Plan 14 OF CAL <br /> cc: Mr. Don Pratt,Atlantic Richfield Company <br /> Mr. James Barton, CVRWQCB <br /> Mr. Bill Halverson,Property Owner <br /> Mr.Monty Zorb,RZ Carwashes,LLC. 7808 Kelley Drive, Suite F, Stockton, CA 95207 <br /> Project File <br /> KAWpmcessUS BP ARCM0216812005 System Installation\SVE-AS SyslnsWP Addendum IB.doc <br />