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• P O. Box 576981-6981 <br /> M.J. Kloberdanz & Associates Modesto, California 95357 <br /> Environmental Assessment Phone: (209) 577-8186 <br /> Fax: (209) 577-8158 <br /> 18 <br /> April 24, 2000 <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 II <br /> Ripona Market, 223 W. Washington Street, Ripon, California <br /> 1.0 PROJECT IDENTIFICATION <br /> The objective of this plan is to provide a scope of work that would further define the <br /> lateral and vertical extent of the hydrocarbon plume in the soil and groundwater at the <br /> Ripona Market facility The work will include a well receptor survey and definition of <br /> the groundwater flow direction as requested in the San Joaquin County department of <br /> Environmental Health letter dated March 31, 2000 We propose the installation of on-site <br /> monitoring wells, in various locations, to obtain soil and ground water samples and for <br /> the calculation of the groundwater gradient Additional characterization may be required <br /> off-site depending on the findings of this phase of work <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 /> i <br />