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Post-It"brand <br /> Fax Transmittal emO 7672 No.of Pages Tod JG(/t CI Tit <br /> J <br /> From <br /> ys <br /> Company <br /> Company SAN QUIN_'COUNTY <br /> Location PUBL HEALTH-S RVICES <br /> Location <br /> Fax _ BNVIRO E � . T?; I)IMSION <br /> �#�j /- �j Telephone# Fax# P ST OE <br /> �/ Wfi BOX 2009 <br /> Comments Original <br /> 7� STOC ,CALIFORNIA 95201 <br /> Disposition: ❑Destroy ❑Return ❑Call for pickup <br /> —24-1991 14 26 FROM 'RS-HOVGTO TO 12094640138 P.03 I <br /> PES Environmental, Inc. <br /> Engineering 8 Environrnental Services <br /> EXECUTIVE SUMMARY <br /> DRAFT FINAL REMEDIAL PLAN <br /> 16 SOUTH CHEROKEE LANE <br /> LODI, CALIFORNIA <br /> September 24, 1991 <br /> Since 1985, numerous investigations of soil and groundwater conditions have been performed <br /> at the 16 South Cherokee Lane site for the purpose of defining the extent of soil and <br /> groundwater contamination associated with former underground fuel storage tanks. These <br /> investigations were performed in accordance with the Tri-Regional Board Staff <br /> Recommendations for Preliminary Evaluation and Investigation of Underground Tank Sites <br /> and the Leaking Underground Fuel Tank (LUFT) Field Manual. Site characterization and <br /> remedial planning activities at the site have been conducted under the oversight of the <br /> California Regional Water Quality Control Board, Central Valley Region and the San Joaquin <br /> County Public Health Services, Environmental Health Division. This report compiles and <br /> analyzes information collected during the investigations, presents an evaluation of remedial <br /> action alternatives, and recommends a final remedial action plan. <br /> The extent of fuel hydrocarbons in soil and groundwater resulting from operations at the <br /> former gas station was defined by collecting soil samples from soil borings and collecting <br /> groundwater samples from monitoring wells. To date, 19 soil borings have been drilled and <br /> over 40 soil samples collected and chemically analyzed. In addition, 13 monitoring wells <br /> have been installed and over 30 groundwater samples collected and analyzed. The results of <br /> soil and groundwater investigations indicate that significant concentrations of fuel <br /> hydrocarbons are found primarily in onsite soil and groundwater. <br /> Potential remedial alternatives were evaluated on the basis of technical merits and cost <br /> effectiveness. Remediation of fuel hydrocarbons in onsite soil as deep as 50 feet below <br /> ground surface will be considered after the effectiveness of groundwater extraction is <br /> evaluated. Groundwater extraction alternatives include extraction wells and extraction <br /> trenches. Groundwater treatment alternatives include: (1) discharge of extracted <br /> groundwater to the City of Lodi wastewater treatment facility, (2) treatment by air stripping, <br /> (3) aboveground biological treatment, (4) treatment by chemical oxidation, and (5) treatment <br /> using activated carbon adsorption. Options for treated groundwater include: (1) discharge to <br /> the sanitary sewer according to the City of Lodi wastewater treatment facility regulations, <br /> (2) discharge to the storm sewer via a National Pollution Discharge Elimination System <br /> (NPDES) permit, and/or (3) reuse. <br /> The recommended remedial alternative for contaminated groundwater is groundwater <br /> extraction using an extraction well with subsequent treatment using activated carbon <br /> adsorption. Aquifer properties have been evaluated to establish the potential capture zone of <br /> an extraction well under long-term pumping conditions. An extraction well was installed on <br /> kabvii�getxwm.wp5 <br /> P.O. Box 1833 • 100 Medical Plaza • Novato. CA 94948 • (415) 898-3531 • FAX (415) 898.2780 <br />