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14 <br /> P.O. Box 576981-6981 <br /> M-J. Kloberdanz Associates Modesto, California 95357 <br /> Environmental Assessment - 1 Phone: (209) 577-8186 <br /> Fax: (209) 577-8158 <br /> December 14, 1999 <br /> Lori Duncan <br /> San Joaquin County <br /> Environmental Health Division <br /> P O Box 2009 <br /> Stockton, California 95201 <br /> RE: <br /> Work Plan <br /> Subsurface Soil and Groundwater Investigation <br /> Ripona Market, 223 W. Washington Street, Ripon, California <br /> 1.0 PROJECT IDENTIFICATION <br /> The following plan provides a scope of work that will help characterize the petroleum <br /> contamination disclosed during the underground tank removal at the above referenced <br /> property We propose the use of a Geo-Probe to obtain soil and ground water samples for <br /> the preliminary characterization of the vertical extent of contamination <br /> 1 1 Site Description and History <br /> Two underground fuel tanks were removed on February 11, 1999 by SEMCO <br /> under permit Low levels of xylene were disclosed in laboratory soil samples <br /> collected at 13 feet in depth, primarily in the area of Tank 1 (TK-1) (Figure 2) <br /> Moderately high levels of specific oxygenated compounds were present in the <br /> stockpiled soil that had surrounded the tanks Since no apparent contamination <br /> was noted during the removal this soil was placed back into the excavation <br /> Table of Laboratory Sample Results (February 11, 1999) <br /> Sample I D Gasoline Benzene Toluene E-Benzene I Xylenes 9260 <br /> TK1-S(a),15' ND ND ND ND ND ND <br /> TK 1-N(a�13' ND ND ND ND 47 ND <br /> TK2-S(eb,13' ND ND ND ND ND ND <br /> TK2-N(a�15' ND ND ND ND ND ND <br /> SP-1 ND ND ND ND ND 190 MTBF, 1200 c Bull <br /> SP-2 ND ND ND ND ND ND <br /> ND=Non Detect Gasoline in mg/Kg 8260 inµglKg <br /> 2.0 WORK PLAN <br /> M J Kloberdanz & Associates proposes to drill a single boring to first groundwater, <br /> approximately 35 feet in depth The Geoprobe boring will be drilled through the former <br /> excavation near the north end of former tank TK-1 (Figure 2) A maximum of five soil <br />