SITE INFORMATION AND CORRESPONDENCE

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li ABLE 1 -CHECKLIST OF REQUIRED DATANK SITES FOR NO FURTHER ACTION REQUESTS AT UNDERGROUND A ion: Terminous Market, 13889 W. Hwy. 12, Lodi, San Joaquin County(RB#390239) Site Name and Local A 2005 sensitive receptor survey stated four private water 1r1. Distanceto production well for municipal, domestic, supply wells are located within 2,000', including one located 100'east of the USTs it. Potato Slough and the agriculture, industry and other uses within 2000 feet of the site Mokelumne River are 2,500'west, and an irrigation ditch is 40'to the south of the Site. II Y 2. Site maps, to scale, of area impacted showing locations of In April 1988, two 550-gallon gasoline USTs were any fo mer and existing tank systems, excavation contours and removed. . sample locations, boring and monitoring well elevation contours, gradients, and nearby surface waters, buildings,. streets, and subsurface utilities; Site lithology consists of peat, clay,silt, and sand to 60', depicting lithology(cross section), treatment system the total depth investigated. 9 ' Y 3. Figures P _ diagrams; The fate of the excavated soil is not described in the Y 4. Stockpiled soil remaining on-site or off-site disposal(quantity); available reports. 5. Monitorin wells remainin on-site, fate; Six monitoring wells(MW-1 through MW-8)will be properly abandoned. Depth to groundwater varied from 2'to 7'bgs. Groundwater flow _ _8.-Tabulated results.of_allgroundwater,...._._---, direction vaned f cn north-to south-Groundwater gradienCvaried from ` elevations and depths to water, 0.007 to 0.4 ft/ft. All data adequately tabulanzed in various reports, including closure repo 7. Tabulated results of all samplingrt. and analyses: FYIDetection limits for confirmation sampling QN Lead analyses 8. Concentration contours of contaminants found and those remaining in soil and The contam'n t oftion the id entif ied applicable groundwater, and both on-site and off-site: reports. 0 Lateral and El Vertical extent of soil contamination Lateral and Vertical extent of roundwater contamination _ 9. Zone of influence calculated and assumptions used for subsurface remediation An engineered remediation was not system and the zone of capture attained for the soil and groundwater remediation required by the lead agency. system; - YJ 10.-Reports/information FY Unauthorized Release Form ❑Y QMRs 17 from 11/04 to 10/08 ❑y Well and boring logs EY PAR 0 FRP M Other NFAR(10/09) Y 11.Best Available Technology(BAT) used or an explanation for not USTs removal and natural attenuation. usin BAT h 12. Reasons why background wasrs Minor residual soil contamination remains on-site. ttamable usin BAT; - 1' 13.Mass balance calculation of substance treated The consultant estimates approximately 50 lbs of TPHg remains in soil. versus that remaining; 1, 14. Assumptions, parameters, calculations and The soil gas sample results were ND at levels comparable to Region 2 model used in risk assessments, and fate and ESLs. transport modelin ; y: 15. Rationale why conditions remaining at site Soil contamination reportedly is limitedin extent.Land use will not adversely impact water quality, health, or (commercial)is not expected to change in the foreseeable future. other beneficial uses;and ' By: JLB Comments:In April 1988, two 550-gallon gasoline USTs were removed from the subject site. Based upon 17 quarters of groundwater monitoring showing a stable plume with declining concentrations to non-detect, Dater the limited extent of contamination remaining in soil, no foreseeable-changes in land use and no threats 11/24/2009 from soil vapor intrusion, Regional Board staff concur with San Joaquin County's Closure Recommendation.