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1 <br /> RIPONA MARKET <br /> 223 W. Washington Street, Ripon, California <br /> Subsurface Soil and Groundwater Investigation III Report <br />' 1.0 PROJECT IDENTIFICATION <br />' The following scope of work was conducted in compliance with the directives of the San <br /> Joaquin County Environmental Health Division review letter dated October 12, 2000 <br /> Division staff required that, prior to the installation of additional monitoring wells, a <br />' detailed picture of the subsurface lithology and dissolved plume dimensions be obtained <br /> utilizing techniques such as continuous core or cone penetrometor sampling The scope <br /> of work presented below provides additional definition of possible groundwater <br />' contamination with the use of direct push technology (Geoprobe) and Simulprobe <br /> sampling <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 Sam le Results (February 11, 1999) <br /> Sample I D I Gasolme7 Benzene Toluene I E-Benzene Xylenes 8260 <br /> TK 1-S 15' ND ND ND ND ND ND <br />' TKi-N 13' ND ND ND ND 47 ND <br /> TK2-S 13' ND ND ND ND ND ND <br /> TK2-N@ 15' ND ND ND ND ND ND <br /> SP-1 ND ND ND ND ND 190 naree, 1200,s„u <br /> SP-2 ND ND ND ND ND ND <br /> ND=Non Detect Gasoline in mg/Kg 8260 to jig/Kg <br />' On January 31, 2000 M J Kloberdanz & Associates drilled a single soil boring to <br /> 30 feet in depth Groundwater was measured at 29 feet below grade surface (bgs) <br /> The former tank excavation had been filled with the previously excavated soils <br /> I and topped with about eight feet of pea gravel so sampling started at ten feet in <br /> depth The boring was located near the center of the backfilled tank excavation <br /> (Figure 2 Site Map) <br /> Laboratory soil samples were obtained every five feet, below the gravel layer, for <br /> laboratory analysis since contaminated soils were placed back in the tank pit The <br />