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NIMBLE 1 -CHECKLIST OF REQUIRED DATA
<br /> FOR NO FURTHER ACTION REQUESTS AT UNDERGROUND TANK SITES
<br /> Site Name and Location: Grenwal's Market,4100 E.Fremont St., Stockton, San Joaquin County(RB#391018)
<br /> Y1 1. Distance to production wells for municipal,domestic, A 2000 sensitive receptor survey identified 26 domestic,
<br /> agriculture, industry and other uses within 2000 feet of the site. industrial and irrigation wells within 2,000 feet of the Site.
<br /> One well is 300'south and four wells are 400'southeast.
<br /> Y 2. Site maps, to scale, of area impacted showing locations of In July 1998, one 6,000-gallon gasoline, one 10,000-gallon
<br /> any former and existing tank systems, excavation contours and gasoline, and one 6,000-gallon diesel USTs,piping, and
<br /> sample locations, boring and monitoring well elevation dispensers were removed.
<br /> contours, gradients, and nearby surface waters, buildings,
<br /> streets, and subsurface utilities;
<br /> Y1 3. Figures depicting lithology(cross section), treatment system Site lithology consists of clay, silt, and sand to 100', the
<br /> diagrams; total depth investigated.
<br /> N 4. Stockpiled soil remaining on-site or off-site disposal(quantity); Approximately 570 y of excavated soli was
<br /> transported to BFI Landoll.
<br /> Y 15. Monitoring wells remainin on-site, fate; I Four monitoring wells(MW-1 through MW4) will be properly abandoned.
<br /> YJ B. Tabulated results of all groundwater Depth to groundwater varied from 45'to 61'bgs. Groundwater flow
<br /> elevations and depths to water,• direction varied from southeast to southwest,and groundwater gradient
<br /> varied from 0.0005 to 0.006 ft/ft.
<br /> 7. Tabulated results of all sampling All data adequately tabularized in various reports,including closure report.
<br /> 0 Detection limits for confirmation
<br /> sampling
<br /> 10 Lead analyses
<br /> LyJ 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 /> ElLateral and El Vertical extent of soil contamination reports.
<br /> Lateral and 7Y Vertical extent of groundwater contamination
<br /> 9. Zone of influence calculated and assumptions used for subsurface remediation The regulatory agency did not require
<br /> system and the zone of capture attained for the soil and groundwater remediation active remediation.
<br /> system;
<br /> 10.Reports/information Unauthorized Release Form �Y QMRs 27 from 2/00 to 11/08
<br /> Well and boring logs PAR FRP Fy] Other Soil Vapor Investigation Report(12/07)
<br /> Closure Report 10/10
<br /> Y 11.Best Available Technology(BAT) used or an explanation for not USTs removal, over-excavation, and natural
<br /> using BAT, I attenuation.
<br /> Y12. Reasons why background was/is Minimal residual soil contamination remains on-site.
<br /> ftainable using BAT,•
<br /> 'S( 13.Mass balance calculation of substance treated The consultant estimated residual mass in soil as 1314 lbs TPHg and
<br /> versus that remaining; 3196 lbs TPHd, and residual mass in groundwater as 0.0023 lbs TPHg.
<br /> Y T4. Assumptions;parameters, ca1cuiairons and -The soft gas passed the—Region 2 commercial ESt:s. SbW contamination
<br /> model used in risk assessments, and fate and failed direct exposure and gross contamination below 3'bgs;however,
<br /> transport modeling; the shallow piping location was 100'from the store. Groundwater was
<br /> predicted to reach water quality goals QGs)in 2010.
<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. Vapor
<br /> other beneficial uses;and intrusion risk has been addressed. Soil contamination is probably no
<br /> longer leaching to groundwater, since water quality goals should have
<br /> been reached in 2010.
<br /> By: JLB Comments:In July 1998, one 6,000-gallon gasoline, one 10,000-gallon gasoline, and one 6,000-gallon diesel
<br /> USTs,piping, and dispensers were removed from the subject Site.Based upon 27 quarters of groundwater
<br /> Date: monitoring showing declining trend estimated to reach WQGs in 2010, the limited extent of contamination
<br /> 3/2/2011 remaining in soil,no foreseeable changes in land use, and limited threats from groundwater, soil, and soil
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