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(ABLE 1 • CHECKLIST OF REQUIRED DATA i FOR NO FURTHER ACTION REQUESTS AT UNDERGROUND TANK SITES a i; Site Name and Location: Fremont Shell Station, 2494 East Fremont Street, Stockton, San Joaquin County Y 1 . Distance to production wells for municipal, domestic, /n 2409, a sensitive receptor survey was conducted. Four water supply wells were identified within a 2,400•foot radius of the site. agriculture, industry and other uses within 2000 feet of the site; The closest well Is a domestic well about 800 feet east-southeast y of the site. A water sample was collected from this well in 2009 that confirmed no impact to this well. 2. Site maps, to scale, of area impacted showing locations of former Two 5,000.gallon, two 8, 000-gallon tanks were removed In 1995. Two gasoline and one waste oil tank, and existing tank systems, excavation contours and sample locations, dispensers, and product piping were removal in 20050 y borings and monitoring wells elevation contours, gradients, and nearby Site maps showing the location of formerand current surface waters, buildings, streets, and subsurface utillues; tanks buildings and streets were provided In reports. 3. Figures depicting lifhology (cross Coarse-grained sediments occur at varying thicknesses at three depth Intervals; 10 to Y section), treatments stem dia rams; 30 ft.bgs, 70 to 85 ft. bgs and 105 to 915 ft. bgs. Borings and crass-sections provided Y g in reports. No treatment was conducted. y 4. Stockpiled soil remaining on-site or 103 tons ofsoil and pea gravel were disposed at the Allied Waste Industries Forward s off-site disposal (quantity); landfill In Manteca in 2005. San Joaquin Co. will confirm waste from well destruction is removed before final closure. ' Ten groundwater monitoring wells, six shallow and four deeper-zone well on-site. Wells 5. Monitoring wells remaining on-site, fate; will be properly destroyed under permit from San Joaquin Co. prior to closure. Y 6. Tabulated results of all groundwater Depth to g.w. ranged from 41 to 57 ft, bgs, Groundwater gradient In both the shallow 6. T a ions and depths to water, and deeper zones predominantly south-southeast i Y 7. Tabulated results of all sampling and analyses: Tabulated results are presented in the Closure Request Report. Detection limits for confirmation sampling Lead analyses ! Y 8. Concentration contours of contaminants found and those remaining in soil and groundwater, and both on-site and off-site: Y Lateral and Y Vertical extent of soil contamination Contaminant contours presented in Closure Lateral and M Vertical extent of groundwater contamination Request Report for soil and groundwater. Y Y N 9. Zone of influence calculated and assumptions used for subsurface No cleanup actions were conducted at this Site* remediatlon system and the zone of capture attained for the soil and groundwater remediation system; y 10. Reports / information MY Unauthorized Release Form �Y QMRs �Y Well and boring logs aPAR 0 FRP ❑Y Other Excavation of 103 tons of and ea ravel aloe with MNA effectively removed Y 11, Best Available Technology (BA7) used or an p g g Y explanation for not using BAT; secondary source from the site Y 12. Reasons why background wasCs unattainable Contaminant concentrations are decreasing, the areal extent of the pollution Is shrinking and background is predicted to be achieved through natural using BAT; degradation. e About 833 lb& (135 gallons) of total petroleum hydrocarbons were calculated to E treated versus that 13, Mass balance calculahat remaining;Hon of substancbe remaining In salt and 9.5 lbs. (1.5 gallons) remain in groundwater !!!! 14. Assumptions, parameters, calculations and model used Mass of pollutants calculated on an estimated average Y concentration of pollutants concentration to a specific volume in risk assessments, and fate and transport modeling; of Impacted soli 15. Rationale why conditions remaining at site will not Contaminant concentrations are decreasing, the areal extent of the Y adversely impact water quality, health, oratherbenefrciat pollution is shrinking and background is predicted to be achieved through natural degradation. uses and N 16. WET or TCLP results NA BY: Comments : The site is an operating Shell-branded service station in a mixed commercial and residential area. An up-gradient Arco service station is an open UST case. Two 5,000-gallon , two 8,000-gallon tanks were removed in Cie 1996. Two gasoline and one waste oil tank, dispensers, and product piping were removed in 2005. Benzene and 1 ,2= DCA were the predominant contaminants of concern at this Site. Horizontal and vertical delineation indicated the hydrocarbon impacts were confined to the Shell property. Vertical impacts extended to about 150 feet below ground Date: surface , Concentrations are naturally decreasing and the areal extent of impacts are shrinking . No prediction when 9125!2014 water quality will be restored was provided. I I