SITE INFORMATION AND CORRESPONDENCE

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1 TABLE 1 -CHECKLIST OF REQUIRED DATA FOR NO FURTHER ACTION REQUESTS AT UNDERGROUND TANK SITES Site Name and Location: Blue Star, 4040 E. Main St., Stockton, San Joaquin County(RB#391140) 7Y 1. Distance to production wells for municipal, domestic, A 2012 sensitive receptor survey reported 15 water supply agriculture, industry and other uses within 2000 feet of wells located within 2,000'of the Site. The nearest wells are 600'to the northeast and 600'to the southeast. None the site. of the wells are threatened by the release. Y 2. Site maps, to scale, of area impacted showing locations In 3/02, one 6,000-gallon and one 12,000-gallon gasoline, of any former and existing tank systems, excavation and one 4,000-gallon diesel USTs were removed. Site contours and sample locations, boring and monitoring maps and figures showing tank locations, excavations, well elevation contours,gradients, and nearby surface building and residual pollutants were provided in waters, buildings, streets, and subsurface utilities; investigation reports. Y 3. Figures depicting lithology(cross Site lithology consists of clay, silt, and sand to 77', the total depth investigated. section), treatment system diagrams; Due to low concentrations in groundwater, a treatment system was not required by the regulatory agency. Approximately 200 tons of excavated soil was removed, tested, and approved 7Y 4. Stockpiled soil remaining on-site for reuse onsite as backfill. Mass estimate for excavated soil was not reported or off-site disposal(quantity); by the consultant. 5. Monitoring wells remaining on-site, Five(5)monitoring wells(MW-1 through MW-5) were properly destroyed prior to closure. P 6. Tabulated results of all groundwater =50'bgs ta was provided in reports indicating depth to groundwater from elevations and depths to water; bgs. Groundwater flow direction from southeast to northeast. gradient varied from 0.0003 ft/ft to 0.0005 ft/ft. 7. Tabulated results of all sampling All data adequately tabularized in various reports. and analyses: F Detection limits for confirmation sampling ❑Y Lead analyses 8. Concentration contours of contaminants found and those remaining in The horizontal and vertical extent of the soil and groundwater, and both on-site and off-site: petroleum pollution is confined to the property limits. ElLateral and ElVertical extent of soil contamination ElLateral and Vertical extent of groundwater contamination 9. Zone of influence calculated and assumptions used for subsurface A treatment system was not constructed. remediation system and the zone of capture attained for the soil and groundwater remediation system; 10.Reports/information DY Unauthorized Release Form DY QMRs(13) 5-05 to 5-13 Well and boring logs PAR n FRP Other Soil Gas and Human Health Risk Assessment Report, 7-13 Y 11.Best Available Technology(BAT) used or Leak was stopped by removing tank and piping. BAT was natural attenuation due to low concentrations in groundwater. an explanation for not usingBAT; �, 12. Reasons why background was/is not Soil pollution presents a minimal threat to human health and finable using BAT; qroundwater pollution is predicted to be restored in 10 years. Y 1 13.Mass balance calculation of substance Initial mass estimates were not provided. Estimated residual TPH mass treated versus that remaining; is <1 lb. (<O.17 gal.)in groundwater. Y14. Assumptions, parameters, calculations Site meets the criteria in the LTCP for commercial and residential use. and model used in risk assessments, and fate Consultant states site does not represent a significant environmental or and transport modeling; health risk. Y 15. Rationale why conditions remaining at Soil and groundwater pollution is reportedly confined to the property site will not adversely impact water quality, limits. Land use(commercial)is not expected to change in the health, or other beneficial uses;and foreseeable future. WQGs will be reached by 2023. Groundwater plume is stable and slowly decreasing in concentration. By: JLB Comments:Multiple USTs were removed at the subject site. Based on the stable and declining concentrations in groundwater, no foreseeable changes in future land use(commercial), and no risks from Date: groundwater, soil vapor, and soil, Regional Board staff recommend closure under the State Water Resources 12/18/2013 Control Board Low Threat Closure Policy.