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i ABLE 1 -CHECKLIST OF REQUIRED DATA FOR NO FURTHER ACTION REQUESTS AT UNDERGROUND TANK SITES Site Name and Location: Heinz of North America, 757 E. Eleventh St., Tracy, San Joaquin County(R8#39037 4) Y 1. Distance to production wells for municipal, domestic, A 2011 sensitive receptor survey reported no wafer a riculture, indust and other uses within 2000 feet of the site. supply wells are located within,2,000'of the Site. Y 2. Site maps, to scale, of area impacted showing locations of any former and in 2/98, one 500-gallon gasoline and one existing tank systems, excavation contours and sample locations, boring 3,000-gallon gasoline USTs were removed. and monitoring'well elevation contours, gradients, and nearby surface waters, buildings, streets, and subsurface utilities; Y1 3. Figures depicting lithology(cross Site lithology consists of clay,silt,and sand to 40', the total depth investigated. section), treatments stem diagrams; Y 4. Stockpiled soil remaining on-site Approximately 353 tons of excavated soil was transported to Forward Landfill in or off-site disposal uantit • Manteca. Y 5. Monitoring wells Eight(8)remaining monitoring wells(MW-1 through MW-8) will be properly destroyed prior to l remainingon-site, fate; cosure. to 10's b s. Groundwater flow 6. Tabulated results of all groundwater Depth to groundwater varied from 4'b g g direction was towards the northeast. Groundwater gradient was not elevations and depths to wafer calculated by consultant. rt _ 7. Tabulated results of all sampkng� All data adequately tabularized in various reports. . and analyses: .- . - -- t EVIDetection limits for confirmation sampling Lead analyses B. Concentration contours of contaminants found and those remaining in The extent of the identified contamination is soil and groundwater, and both on-site and oft-site: described in the available reports. Lateral and Y❑Vertical extent of soil contamination Lateral and F1 Vertical extent of groundwater contamination 9. Zone of influence calculated and assumptions used for subsurface The engineered remediation was ORC remediation system and the zone of capture attained for the soil and injections(in-situ chemical oxidation). groundwater remediation system; - 'r 10.Reports/information El Unauthorized Release Form ❑Y QMRs (24)5-98 to 12110 0 Well and boring logs 0 PAR H FRP ❑Y Other Closure Report, 12/11; Closure Report Addendum 1/13 Y 111.Best Available Technology(BAT) used or an explanation USTs removal, ORC injections, over-excavation,and for not using BAT; I natural attenuation. Y 12. Reasons why background wasrs Residual soil and groundwater contamination remains. ttainable using BAT," �y_i3JVlass_6alance_calculation"of_substance Over-excavation removed approximately 1,155.1 lbs. TPN from soil. treated versus that remaining; Cdns"ultant estimated friitia!mass"X—grgrdundwateras 3534bs—df"TPH:and--� - residual mass in groundwater as 10.8 lbs. of TPN. - Y 14. Assumptions, parameters, Groundwater and soil passed the Region 2 ESLs for soil vapor intrusion,and calculations and model used in risk soil met SWRCB LTCP for vapor intrusion for commercial use. Soil failed assessments, and fate and transport LTCP for direct contact for benzene(39 mg/kg)and ethylbenzene(250 mg/kg) modeling; at 5-6'bgs in tank pit. Site is a large warehouse facility with USTs outside of loading dock. Consultant states site does not represent a significant risk.Has SWRCB UST CUF recommendation for closure. Y 15. Rationale why conditions remaining at Soil and groundwater contamination reportedly are limited in extent. Land use site will not adversely impact water quality, (commercial)is not expected to change in the foreseeable future. Consultant health, or other beneficial uses;and estimated WQGs will be reached by 2015. Groundwater plume is stable and declining. By: JLB , Comments:In 2/98, one 500-gallon gasoline and one 3,000-gallon gasoline USTs were removed of the subject site.Residual soil and groundwater contamination remains. Based upon the limited extent of Date: contamination reported in soil and groundwater, a stable and declining concentration plume, no foreseeable 5/14/2013 changes in future land use(commercial),and minimal risks from groundwater and soil vapor and limited risk from soil, Regional Board staff concur with San Joaquin County's Closure Recommendation. i