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STABLE 1 -CHECKLIST OF REQUIRED DAT)ve
<br /> FOR NO FURTHER ACTION REQUESTS AT UNDERGROUND TANK SITES
<br /> Site Name and Location: Quik Stop Market#121, 1196 Louise Avenue, Manteca,San Joaquin County(Lustis Case#391011)
<br /> Y 1. Distance to production wells for municipal, domestic, agriculture, A well survey in 2000 showed one domestic
<br /> industry and other uses within 2000 feet of the site; well located 1,000 ft to the northwest, two
<br /> irrigation wells located 400 ft to the west and
<br /> 1,000 ft to the northeast;and one municipal
<br /> supply well located 1250 feet southeast of the
<br /> site.
<br /> Y Site maps, to scale, of area impacted showing locations of any former One 8,000-gallon and two 10,000-gallon
<br /> and existing tank systems, excavation contours and sample locations, gasoline USTs were removed 3/98.
<br /> boring and monitoring well elevation contours, gradients, and nearby
<br /> surface waters, buildings, streets, and subsurface utilities;
<br /> Y 3. Figures depicting lithology(cross section), treatment system diagrams; Site lithology consists of sand,silt,and
<br /> clay to 76 feet, the total depth
<br /> investigated.
<br /> Y 4. Stockpiled soil remaining on-site or off-site disposal(quantity); The volume and fate of the soil removed in 3/98 by Quik
<br /> Stop Market Inc. was not provided in the reports or file.
<br /> 1' 5. Monitoring wells remaining on-site, fate; Twelve monitoring wells(MW-1 through MW-12)and one extraction well
<br /> RW-1 remaining on-site will be property abandoned.
<br /> 6. Tabulated results of all groundwater Depth to groundwater varied from 13 to 23 feet below ground surface
<br /> elevations and depths to water,' (bgs). The groundwater gradient was 0.001 ft/ft, and the downgradient
<br /> direction was reported to the Northeast.
<br /> 7. Tabulated results of all sampling and In 3/98,maximum confirmation soil concentration was:MtBE, 27 mg/kg. In 9/06
<br /> analyses: all soil confirmation sample results were ND. Maximum groundwater monitoring
<br /> FYIconcentrations in 4/02 were: TPHg, 130,000 pg/L;and MtBE, 180,000 pg/L. In
<br /> Detection limits for confirmation 4/06,all groundwater sample results were ND.
<br /> sampling
<br /> ❑N Lead analyses
<br /> 8. Concentration contours of contaminants found and those remaining in soil and The extent of contamination is
<br /> Z
<br /> ndwater, and both on-site and off-site: adequately defined by soil borings
<br /> Lateral and Y Vertical extent of soil contamination and monitoring wells.
<br /> Lateral and 8 Vertical extent of groundwater contamination
<br /> 9. Zone of influence calculated and assumptions used for subsurface remediation Ozone injection was the required
<br /> system and the zone of capture attained for the soil and groundwater remediation remediation.
<br /> system;
<br /> 10.Reports/information QY Unauthorized Release Form QY QMRs(30 from 1998—2006)
<br /> Well and boring logs 0 PAR ❑y FRPIII Other,'Site Closure Report
<br /> Y 11.Best Available Technology(BAT)used or an explanation for not using BAT, BAT was over-excavation,interim
<br /> GWP&H, ozone injection,and natural
<br /> attenuation.
<br /> No soil contamination and groundwater pollution
<br /> N 12.Reasons why background wasris unattainable using BAT, remain on-site.
<br /> N 13.Mass balance calculation of substance treated versus that All confirmation soil and groundwater monitoring
<br /> samples were ND;it appears that no petroleum
<br /> remaining; hydrocarbons mass remains.
<br /> N 14. Assumptions, parameters, calculations and model used in A risk assessment was not required. Soil ESLs are not
<br /> risk assessments, and fate and transport modeling; exceeded. Water Quality Goals are not exceeded.
<br /> Y 15. Rationale why conditions remaining at site will not adversely Soil contamination was limited in extent and no
<br /> impact water quality, health, or other beneficial uses;and evidence remains for residual contamination. Results
<br /> of 30 quarters of groundwater monitoring showed a
<br /> decreasing trend in concentrations to ND.
<br /> By: JLB Comments:One 8,000-gallon and two 10,000-gallon gasoline USTs were removed 3/98 from the subject site. Site is
<br /> a farm surrounded by the City of Tracy. No soil contamination and groundwater pollution remain on-site. Based
<br /> Date: upon 30 quarters of declining groundwater concentrations to ND, and no remaining evidence of contamination
<br /> 11/22//2006 present in soil, Regional Board staff concur with San Joaquin County's Closure Recommendation.
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