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December 27, 1988 <br /> Ms. Eleanor Ratliff, REHS <br /> San Joaquin County Environmental Health <br /> PO Box 2009 <br /> Stockton, CA 95201 <br /> RE: Work plan to remove contaminated soil within the excavation <br /> and to install vapor extraction wells, Regal Station 804„ 1448 N. <br /> El Dorado Streec, Stockton, California. <br /> Dear No. Ratliff: <br /> The initial site assessment has been accomplished and indicates <br /> that soil contamination associated with the underground storage <br /> tank area of the above mentioned site is restricted to the area <br /> beneath the tanks and at the 30 foot depth southeast of the 1 <br /> excavated area towards and including soil boring SB2, see figure 1. <br /> To delineate the vertical extent of contaminated soil beneath the / <br /> • tank excavation and to aid an the remediation of that soil, / <br /> Western Geo-Engineers (WEGE) will use D.C. Savone's Versadrill. r <br /> WEGE is a Registered Geologist/Environmental Consulting Co. and is <br /> also a licensed C57 drilling contractor. This site will be <br /> assessed under Calif. Reg. Geol. # 3037 and WEGE's C-57 licence <br /> #513857. <br /> The Versadrill is a crane operated solid flight auger, that is <br /> capable of extending out into an excavation and augering a 36" <br /> diameter hole. Sampling of the Versadrilled hole is performed by <br /> lowering a hand sampler/driver that contains one 2" x 5" sterile <br /> brass sleeve and driving into the undisturbed soil after the <br /> versadrill has been removed. The sampling will occur* in 5 foot <br /> intervals starting at the 20 foot depth from surface (5 feet below <br /> the excavation surface) . The Versadarilled holes will be utilized <br /> for the placement of vapor efficient extraction wells. The <br /> drilling procedure can also be used for excavation of contaminated <br /> soil, due to the large diameter and surface area the boring <br /> produces, see Figure 2. <br /> WEGE will assess the site under the guidelines outlined in the May <br /> 1988 "Leaking Underground Fuel Tank Field Manual: Guidelines for <br /> Site Assessment, Cleanup, and Underground Storage Tank Closure" by <br /> the State of California Leaking Underground Fuel Tank Task Force. <br /> 1 <br />