SITE INFORMATION AND CORRESPONDENCE

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TABLE 1 -CHECKLIST OF REQUIRED DATA FOR NO FURTHER ACTION REQUESTS AT UNDERGROUND TANK SITES Site Name and Location: Super Center Mart, 701 East Charter Way, Stockton, San Joaquin County 1. Distance to production wells for municipal, The closest water supply well is about 1,560 feet northeast(down-gradient) Y of the Site and is inactive. The closest surface water body is approximately domestic, agriculture, industry and other d, uses within 2000 feet of the site; 1,850 feet north of the Site. ,,. Y 2. Site maps, to scale, of area impacted showing locations of former See Figures 1 through 7 and existing tank systems, excavation contours and sample locations, borings and monitoring wells elevation contours, gradients, and nearby surface waters, buildings, streets, and subsurface utilities; 71 3. Figures depicting lithology(cross section), treatment system diagrams; See Attachment A for DPE system layout, and Atta��rr�rl�'ot'��5�,;�EIyT sections. Encountered lithology included interfingered sands, gravely sand, clays and silts to the maximum depth explored of 150 ft bgs. Black clay was observed at 150 ft b s. Y 4. Stockpiled soil remaining on-site or off-site No stockpiled soil remaining onsite. A total of 341.18 tons(approximately disposal(quantity); 260 yd?) of soil excavated during UST replacement was disposed of at Forward Landfill. Y 5. Monitoring wells remaining on-site, fate; 10 groundwater monitoring wells four vapor extraction wells, and two groundwater extraction wells destroyed after approval for.NFA Finding. Y 6. Tabulated results of all groundwater See Tables 1 and 2 elevations and depths to water, Y 7. Tabulated results of all sampling and analyses: See Tables 1 through 4 and Attachment A 171 Detection limits for confirmation sampling MLead analyses Y 8. Concentration contours of contaminants found and those remaining in soil and See Figures 4 through 6 1groundwater, and both on-site and off-site: Y Lateral and M Vertical extent of soil contamination EiLateral and E] Vertical extent of groundwater contamination N 9. Zone of influence calculated and DPE—approximately 5,995 pounds(962 gallons)of TPH-G assumptions used for subsurface Groundwater Capture Zone approximately 119 feet remediation system and the zone of Vapor extraction Radius of Influence approximately 23 feet capture attained for the soil and groundwater remediation system,- 10. stem;10.Reports/information FY-1 Unauthorized Release Form ❑Y QMRs See Case File ❑Y Well and boring logs ❑Y PAR ❑Y FRP ❑Y Other 11.Best Available Technology(BAT) used or an explanation for not using BAT: DPE was determined to be the Best Y Available Technologyfor cleanup at this Site Y 12.Reasons why background was/is unattainable A prediction of when WQOs would be met was not provided. using BAT; 13.Mass balance calculation of substance treated DPE removed approximately 5,995 pounds (962 gallons)of TPH-G, Y and an unknown mass was destroyed by natural degradation. An versus that remaining; estimated 10.24 pounds of dissolved TPH-G mass remains. 14.Assumptions, parameters, calculations and Site appears to meet the State Water Resources Control Board's Low Y model used in risk assessments, and fate and Threat Policy. transport modeling; Y 15.Rationale why conditions remaining at site will Post remedial concentrations are stable to decreasing. Water Quality not adversely impact water quality, health, or Objectives should be reached within decades to hundreds of years. other beneficial uses. The Site appears to meet the State Water Resources Control Board's Low Threat Policy. F771 16.WET or TCLP results NA By: VJF Comments: The release was discovered in 1998 during UST system removal. The property is currently occupied Date: by gasoline station and future land use is anticipated to remain commercial. Petroleum 17 March 2016 hydrocarbon impacts are adequately delineated and concentrations are stable to declining. The Site appears to meet the State Water Resources Control Board's Low Threat Closure Policy.