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<br /> - TYLE -CHECKLIST OF REQUIRED DATA
<br /> FOR NO FURTHER ACTION REQUESTS AT UNDERGROUND TANK SITES
<br /> Site Name and Location: Former Victor Road Shell, 880 E. Victor Rd., Lodi, San Joaquin County(RS#390475)
<br /> y '1. Distance to production wells for municipal, domestic, A 1999 sensitive receptorsurvey reported no supply
<br /> '.a riculture, ind stry and other uses within 2000 feet of the site.-
<br /> wells within 2,000'of the site.
<br /> y 2. Site maps, to scale, of area impacted showing locations of In 12-94, two 5,000-gallon and two 8,000-gallon gasoline
<br /> any former and existing tank systems, excavation contours and USTs and associated piping and dispensers were
<br /> sample locations, boring and monitoring well elevation removed.
<br /> contours, 9 radients, and nearby surface waters, buildings,
<br /> streets, and subsurface utilities;
<br /> Site lithology consists of silt and sand to 100', the total
<br /> Y 3. Figures depicting lithology(cross.section), treatment system depth investigated.
<br /> diagrams;
<br /> ' - - - Approximately 942 y of excavated soil was transported
<br /> Y 4. Stockpiled soil remaining on-site or off-site disposal (quantity), to Forward Landfill in Manteca..
<br /> �5. Monitoring wells remaining on-site, fate;, Seventeen(17)monitoring wells(MW-1 through MW-17)and two piezometers.
<br /> Y P-1 and P-2)will be properly destro ed..
<br /> 6. Tabulated results of all groundwater Depth to groundwater varied from 47'bgs to 58'bgs. Groundwater flow
<br /> , direction varied from north to south. Groundwater gradient was 0.01 ft/ft
<br /> elevations and depths to water
<br /> in November 2010.
<br /> 17. Tabulated results of all sampling All data adequately tabularized in various reports, in
<br /> closure report.
<br /> and analyses: ,
<br /> FYI Detection limits for confirmation
<br /> sampling -
<br /> ND Lead analyses
<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 is described in the
<br /> available reports.
<br /> Y❑Lateral and -�Vertical extent of soil contamination
<br /> _- - - : ateral'antl - M Vertical exterit-of- roundwater contamination —" - - --'
<br /> 9. Zone of influence calculated and assumptions used for subsurface remediation Groundwater extraction and offsite
<br /> :'.system and the zone of capture attained for the soil and groundwater remediation treatment was the engineered.
<br /> system; remediation.
<br /> 10.Reports/information QY Unauthorized Release Form ❑Y QMRs(43) 12-99 to 11-10
<br /> Well and boring logs [y PAR ❑Y 'FRP ❑y Other Closure Report(11-11))
<br /> Y. 11.Best Available Technology(BAT) used or an explanation for not using USTs removal,groundwater extraction,and
<br /> BAT; ; natural attenuation.
<br /> y 12. Reasons why background walls unattainable Residual soil and groundwater contamination remains on-site.
<br /> BAT,
<br /> Y 13.Mass balance calculation of substance treated Consultant estimated initial groundwater mass as 38.1 lbs of TPH and
<br /> versus that remaining; residual groundwater mass as 0.045 lbs of TPH.Approximately 24 lbs
<br /> of TPH was removed by groundwater extraction.
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<br /> :y::]
<br /> 14. Assumptions,parameters, calculations and Soil concentrations did not exceed Region 2 Environmental Screening
<br /> model used in risk assessments,and fate and Levels(ESLs)for commercial use.A soil vapor survey was not
<br /> transport modeling; - conducted. Groundwater plume is stable and declining. Consultant
<br /> states site does not represent a significant risk.
<br /> Y 15. Rationale why conditions remaining at site will Soil and groundwater contamination reportedly are limited in extent.
<br /> ,. not adversely impact water quality, health, or other Land use(commercial)is not expected to change in the foreseeable
<br /> beneficial as;and future. TPH will reach WQGs in 2012. -
<br /> By. JLB Comments In 12-94, two 5,000-gallon and two 8,000-gallon gasoline USTs and associated piping and
<br /> dispensers were removed.at the subject site. Minor residual soil and groundwater contamination remains
<br /> Date: on-site. Based upon the limited extent of contamination reported in soil, groundwater concentrations that
<br /> 12/19/2011 will reach WQGs in 2012, no foreseeable changes in future land use(commercial), and minimal risks from
<br /> .soil, soil vapor, and groundwater, Regional Board staff concur with San Joaquin County's Closure
<br /> Recommendation.
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