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LE 1 -CHECKLIST OF REQUIRED DATA
<br /> FOR NO FURTHER ACTION REQUESTS AT UNDERGROUND TANK SITES
<br /> I Site Name and Location: Quik Stop Marketit39, 2285 E.,Fremont St:, Stockton San Joaquin County(RB#391026) . -
<br />? Y 1. Distance to production wells for municipal, domestic, A 2009 sensitive receptor survey stated one inactive
<br /> drinking water well is located 400',west-southwest of the
<br /> agriculture, industry and other,uses within 2000 feet of the site. Site. - '
<br /> Y 2. Site maps, to scale, of area impacted showing locations of In November 1998, two 10,000-gallon gasoline USTs were
<br /> any former and existing tank systems, excavation contours and removed. The site is currently a convenience store with
<br /> sample locations, boring and monitoring well elevation . gasoline USTs.
<br /> contours, gradients, and nearby surface waters, buildings,
<br /> streets, and subsurface utilities; - -
<br /> Site lithology consists of clay, silt, and sand to100
<br /> , ',the
<br /> Y 3. Figures depicting lithology(cross section), treatment system total depth investigated. - - -
<br /> diagrams
<br /> Approximately 480 y(Fof excavated soil was excavated
<br /> Y 4. Stockpiled soil remaining on-site or off-site disposal(quantity);- . and transported to Forward Landfill in Manteca.
<br /> Y 5. Monitoring wells remainingon-site, fate; Eight monitoring wells(Mw-1,through MW-8)will be properly abandoned.
<br /> 6. Tabulated results of all groundwater Depth to groundwater varied from 41'to 54'bgs. Groundwater flow
<br /> elevations and depths to water, direction was towards the north. Groundwater gradient varied from 0.001
<br /> __ to 0.005_Wft. . :. - —_
<br /> i 7. Tabulated results of all sampling All data adequately tabularized in various reports, including closure report.
<br /> and analyses: -
<br /> ❑Y Detection limits for confirmation
<br /> sampling - - - - -
<br /> ❑Y Lead analyses
<br /> i 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 is shown in applicable
<br /> reports.
<br /> 0 Lateral and 0 Vertical extent of soil contamination
<br /> FY
<br /> Lateral and Vertical extent of groundwatercontamination
<br /> 9. Zone of influence calculated and assumptions used for subsurface remediation The regulatory agency did not require an
<br /> ;system and the zone of capture attained for the soil and groundwater remediation engineered remediation.
<br /> s stem; - -
<br /> 1
<br /> 10.Reports/information �Y Unauthorized Release Form FYI-QN1RS 39 from 12/99 to 9/09
<br /> - QY Well and boring logs QY PAR FRP - Other No Further Action Required Request(10109)
<br /> Y 11.Best Available Technology(BAT) used or an explanation for not USTs removal, over-excavation,and natural _
<br /> usin BAT attenuation.
<br /> Y 12. Reasons why background wads Minor residual soil and groundwater contamination remain on-site.
<br /> ttainable usin BAT,
<br /> - y; balance_calculation of substance treated_ The consultant estimates approximately ater.gallons TPHg and
<br /> 13.Mass.that remaining, - - - 0:003`gailons 1;2=DCA remain-ln groundwater.
<br /> versus --- - --_
<br /> 14. Assumptions, parameters, calculations and The consultant stated the lateral distance from residual soil to building
<br /> model used in risk assessments, and fate and (60'), shallow silty soil,and contaminant location(limited to 1'-2'depth-
<br /> " transport modeling; - under dispenser)did not pose a risk from vapor intrusion. TPHg
<br /> (440 mg//kg)exceeded gross contamination and direct exposure ESL
<br /> for soil;consultant recommends PPE for future construction workers.
<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 foreseeablefuture.
<br /> ii other beneficial uses;and - -
<br /> By: JLB , Comments:In November 1998, two 10,000-gallon gasoline USTs were removed. The site is currently a
<br /> convenience store with gasoline USTs. Based upon 39 quarters.of groundwater monitoring showing a stable
<br /> Date: plume with declining concentrations, the limited extent of contamination remaining in soil and groundwater,
<br /> 1127/2010 no foreseeable changes in land use,and minimal threats fromsoil vapor intrusion and.gross contamination, -
<br /> - Re Tonal Board staff concur with San Joaquin Count 's.Closure Recommendation.
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