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rr ABLE 1 -CHECKLIST OF REQUIRED DATA FOR NO FURTHER ACTION REQUESTS AT UNDERGROUND TANK SITES Site Name and Location: Tracy Marine Sales, 2353 Toste Rd, Tracy, San Joaquin County(RB 11390976) ___1 1. Distance to production wells for municipal, domestic, A 2011 sensitive receptor survey reported one water agriculture, industry and other uses within 2000 feet of the supply well(1400'northwest)and four domestic well site. (nearest are 150'south and 400'south)within 2,000'of the Site. The wells are not threatened by this release. Y 2. Site maps, to scale, of area impacted showing locations of any former in 10-86, twol,000-gallon gasoline USTs were and existing tank systems, excavation contours and sample locations, removed. boring and monitoring well elevation contours, gradients, and nearby surface waters, buildings, streets, and subsurface utilities; Y 3. f=igures depicting lithology(cross section), treatment system diagrams; Site lithology consists of clay,silt,sand, and gravel to 60', the total depth investigated. NI 4. Stockpiled soil remaining on-site or off-site disposal The fate of excavated soil was not discussed in the available uanti reports. P5. Monitoring wells remaining on-site, Eleven(11)monitoring wells(MW-1 through MW-11)and twelve(12)remediation ; wells(EW-1, OW-1, and 0-1 through 0-10) will be properly destroyed. 6. Tabulated results of all groundwater Depth to groundwater varied from 6'bgs to 9'bgs. Groundwater flow direction elevations and depths to water, varied from north to northwest. Groundwater gradient varied from 0.003 ft(ft to 0.015 ft/ft. _yJ'7.-Tabulate results of allsampling~ ``A7l to deq[Fafel aliula`rlied-ln various Teports;in`cfuding closure repork and analyses: Y❑ Detection limits for confirmation sampling ' �N Lead analyses LY J 8. Concentration contours of contaminants found and those remaining in The extent of the identified contamination is soil and groundwater, and both on-site and off-site: described in the available reports. ElLateral and Y❑Vertical extent of soil contamination Lateral and Vertical extent of groundwater contamination 9. Zone of influence calculated and assumptions used for subsurface Ozone inject was the engineered remediation. remediation system and the zone of capture attained for the soil and groundwater remediation system; 10.Reports/information ❑Y Unauthorized Release Form ❑Y QMRs(45) 12-99 to 3-11 0 Well and boring logs 151PAR FY FRP Other Closure Report(3-12), Closure Report Addendum 11-10 Y 111.Best Available Technology(BAT) used or an explanation USTs removal, ozone injection,and natural attenuation. for not usingBAT; Y 12. Reasons why background warms unattainable Residual soil contamination remains. Z BA T.- Y:-f.-3-Mass-balance-calculation-of-substance-treated - Consultant estimated approximately 112.2 gal.of TPNin soil versus that remaining; (mainly absorbed below water table)prior to remediation and + 2.31 gal in groundwater. No TPH remains in groundwater. I, 14. Assumptions,parameters, calculations and Soil vapor failed Region 2 ESLs but passed the J&E Model.Soil model used in risk assessments, and fate and initially failed Region 2 ESLs for BTEX at 5'bgs and TPHg at 1 transport modeling; 10'b s. Consultant states site does not re resent a significant risk. 77 15. Rationale why conditions remaining at site will Sol1 contamination reportedly is limited in extent. Groundwater not adversely impact water quality, health, or other plume has reached non-detect. Land use(commercial)is not beneficial uses;and expected to change in the foreseeable future. TPH has reached WQGs. By: JLB Comments:In 10-86, two 1,000-gallon gasoline USTs were removed at the subject site.Residual soil fa contamination remains.Based upon the limited extent of contamination reported in soil,groundwater Date: reaching WQGs, no foreseeable changes in future land use(commercial),and minimal risks from soil vapor - 10/12/2012 and soil, Regional Board staff concur with San Joaquin County's Closure Recommendation.