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PUBLIC HEALTH SERVICES 0.V,0. <br /> SAN JOAQUIN COUNTY <br /> JOGI KHANNA A1D M.P H <br /> He;dch Officer cP <br /> P.O. Box 2009 • (1601 East Hazelton Avenue) • Stockton, California 95201 <br /> (209) 468-3400 <br /> DAVID CHAVIER <br /> BANK OF STOCKTON <br /> PO BOX 1110 � � I { <br /> STOCKTON CA 95201 UU JAN 2 3 199 <br /> RE: Babka/San Joaquin Beverage Company REFER TO SITE CODE: 2000 <br /> 1149 West Weber <br /> Stockton, CA 95201 <br /> APN# 145-190-02 <br /> San Joaquin County Public Health Services Environmental Health Division (PHS/EHD) has completed <br /> review of the Geological Audit Services, "Site Contamination Workplan", dated December 9, 1991. <br /> PHS/EHD comments follow. <br /> PHS/EHD agrees that re-excavation is an effective method to remove contaminated soil eliminating a <br /> potential source of contamination to groundwater. Due to the depth to groundwater in the vicinity of the <br /> site, a groundwater investigation is required. A minimum of three monitoring wells are necessary to <br /> determine the groundwater gradient and to define the extent of groundwater contamination. <br /> 1. The Tri-Regional Recommendations, August 10, 1990,suggests that a minimum of one monitoring <br /> well be installed in a verified downgradient direction within 10 feet of the former tank location. <br /> Please revise the proposed wells location to include a downgradient monitoring well within 10 feet <br /> of the former tank location. <br /> 2. The Workplan indicated that all samples, soil and water,would undergo BTEX,TPH-g, TPH-d <br /> and organic lead analysis. Due to the instability of organic lead, PHS/EHD prefers total <br /> lead/soluble lead analysis. Previous lead levels, 42 ppb TWG/E-15 April 1991, exceeded the State <br /> of California Drinking Water Maximum Contaminate Level, 50 ppb. <br /> 3. The Workplan did not estimate the amount of soil which would be excavated. Adequate sampling <br /> is necessary to characterize the effectiveness of the re-excavation. Residual contamination, <br /> remaining at the conclusion of the re-excavation attempt,will require additional remediation. <br /> A Division of Son Jmaquin County Hcdth(are Services 0 <br />