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r � <br /> r <br /> M RIPONA MARKET <br /> r 223 W. Washington Street, Ripon, California <br /> Corrective Action Plan <br /> r 1.4 PROJECT IDENTIFICATION <br /> rThe following scope e of work was conducted to evaluate the impact and <br /> environmental risk of the soil and groundwater contamination and remediation <br /> options associated with an underground tank previously removed from the Ripona <br /> Market facility as directed by San Joaquin County Environmental Health <br /> Department Contamination clean up concentrations and the effectiveness of <br /> rvarying contamination cleanup technologies have been evaluated Exploratory <br /> borings and groundwater monitoring wells have been used to define the vertical <br /> rand lateral limits of contamination in the soil and ground water <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 /> Moderate levels of oxygenated compounds were present in the soils excavated <br /> during the tank removal Since no apparent contamination was noted during the <br /> Iremoval this soil was placed back into the excavation <br /> Table of Laboratory Sample Results (February 11, 1999) <br />' Save I D Gasoline Benzene I Toluene E-Benzene Xylenes 8260 <br /> TKi-S 15' ND ND ND ND ND ND <br /> TKl-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 wm, 1200 c B. <br />' SP-2 IND ND ND ND ND ND <br /> ND=Non Detect Gasoline in mg/Kg 8260 inµg/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 /> and capped with eight feet of pea gravel Soil sampling for lithology and <br />' laboratory analysis started at ten feet in depth The bonng was located near the <br /> • center of the backfilled tank excavation (Figure 2 Site Map) <br /> 1 <br /> I <br />