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QBLE 1 -CHECKLIST OF REQUIRED DATA �*
<br /> FOR NO FURTHER ACTION REQUESTS AT UNDERGROUND TANK SITES
<br /> Site Name and Location: JC Trucking, 1207 Aurora Street, Stockton San Joaquin)County(RB#390749)
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<br /> y 1. Distance to production wells for municipal, domestic, A 1998 sensitive receptor survey stated no drinking water
<br /> agriculture, industry and other uses within 2000 feet of the site. wells are located within 2,000'of the Site.
<br /> if
<br /> 2. Site maps, to scale, of area impacted showing locations of In May 1992, two 4,000-gallon gasoline and two
<br /> Y any former and existing tank systems, excavation contours and 5,000-gallon diesel USTs were removed. The site is
<br /> sample locations, boring and monitoring well elevation currently a vacant lot used for truck maintenance and
<br /> contours, gradients, and nearby surface waters, buildings, storage with no buildings.
<br /> streets, and subsurface utilities; q
<br /> :Y:1 3. Figures depicting lithology(cross section), treatment system Site lithology consists of clay, silt,and sand to 110`, the
<br /> total depth investigated.
<br /> diagrams; ,
<br /> { Y 4. Stockpiled soiLremaining on-site or off site disposal(quantity); Although 50 y of excavated soil was described as
<br /> stockpiled, the fate of that soil is not discussed in the
<br /> s available reports.
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<br /> Eleven monitoring wells(MW 1,MW--2, MW-4 through MW-12)and twelve
<br /> y 5. Monitoring wells remaining on-site, fate; ozones are oints SP-1'through SP-12 will be property abandoned.
<br /> 6. Tabulated results of all groundwater
<br /> Depth to groundwater varied from 30'to 39'bgs. Groundwater flow 4
<br /> s ,elevations and depths fo water ---,-: .di!ection varied from northeast to southeast. Groundwater gradient
<br /> varied from 0:0009 to 0,015fi ft/ft.
<br /> FYI 7. Tabulated results of all sampling All data adequately tabularized in various reports,including closure report
<br /> and analyses:
<br /> Detection limits for confirmation
<br /> { sampling
<br /> I N❑ Lead analyses 3E
<br /> 8. Concentration contours of contaminants found and those remaining in soil and The extent of the identified
<br /> groundwater, and both on-site and off-site: contamination shown in applicable
<br /> reports.
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<br /> ElLateral and ElVertical extent of soil contamination
<br /> t Lateral and Vertical extent of roundwater contamination
<br /> 9. Zone of influence calculated and assumptions used for subsurface remediation a Ozone injection into groundwater was
<br /> system and the zone of capture attained for the soil and groundwater remediation the required engineered remediation.
<br /> s stem;
<br /> 10.Reports/information [Y Unauthorized Release Form [E QMRs °39 from 4/99 to 6/09
<br /> + f
<br /> �y Well and boring logs ❑y PAR FRP Other Site Closure Request(11/09)
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<br /> Y 11.Best Available Technology(BAT) used or an explanation for not USTS removal, ozone injection,and natural
<br /> {
<br /> using BAT; attenuation.
<br /> Uy 12. Reasons why background waslis Minor residual soil and groundwater contamination remain on-site.
<br /> ttainable using BAT,- J
<br /> __,-_---«- =. - Thi consultant estimates-approximately-0.9-kg:TAH-remains-in-:-
<br /> R y 13.Mass balance calculation of substance Treated groundwater.
<br /> versus that remaining;
<br /> i
<br /> y 14. Assumptions, parameters, calculations and The soil gas results did not exceed Region 2 ESLs and OEHHA
<br /> model used in risk assessments, and fate and CHHSLs. L `
<br /> transport modeling; ..
<br /> y 15. Rationale why conditions remaining at site Soil contamination reportedly is limited in extent.Land use
<br /> will not adversely impact water quality, health, or (commercial)is not expected to change in the foreseeable future.
<br /> l other beneficial uses;and 'f r
<br /> By: JLB Comments:In May 1992, two 4,000-gallon gasoline and two 5,000;gallon diesel USTS were removed at the
<br /> subject site. The site is currently a vacant lot used for truck maintenance and storage with no buildings.
<br /> Date: Based upon 39 quarters of groundwater monitoring showing a stable plume with declining concentrations,
<br /> 12/2/2009 the limited extent of contamination remaining in soil and groundwater, no foreseeable changes in land use,
<br /> and no threats from soil vapor intrusion Re Tonal Board staff concur with San Joaquin County's Closure
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