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'"WTABLE 1 -CHECKLIST OF REQUIRED DATN..,l
<br /> FOR NO FURTHER ACTION REQUESTS AT UNDERGROUND TANK SITES
<br /> Site Name and Location: Cherokee Trucking,3535 Cherokee Rd., Stockton, San Joaquin County(RB#390223)
<br /> Y J 1. Distance to production wells for municipal, A 2012 sensitive receptor survey reported 1 municipal and 12 domestic
<br /> domestic, agriculture, industry and other uses water supply wells within 2,000'of the Site. The nearest wells are a
<br /> within 2000 feet of the site. domestic well located 250'southeast and a domestic well
<br /> 450 northeast.None of the wells are threatened by the release.
<br /> Y 2. Site maps, to scale, of area impacted showing locations of In 10189, three 500-gallon and one 2,000-gallon waste oil
<br /> any former and existing tank systems, excavation contours USTs were removed. In 9197, one 2,000-gallon, one
<br /> and sample locations, boring and monitoring well elevation 7,500-gallon, and one 8,000-gallon gasoline USTs,and one
<br /> contours, gradients, and nearby surface waters, buildings, 8,000-gallon and two 10,000-gallon diesel USTs were
<br /> streets, and subsurface utilities; removed.
<br /> Y 3. Figures depicting lithology(cross section), treatment Site lithology consists of clay, silt,sand, and gravel to 105', the
<br /> system diagrams; total depth investigated.
<br /> Y 4. Stockpiled soil remaining on-site or off-site disposal Approximately 180 yd of excavated soil was transported to
<br /> (quantity); Forward Landfill in Manteca.
<br /> ___1 5. Monitoring wells All monitoring wells(MW--1 through MW-9)and remediation wells(VP-1, VW-1 through VW-3)will be
<br /> remainin on-site, fate; properly destroyed prior to closure.
<br /> YJ 6. Tabulated results of all groundwater Depth to groundwater varied from 45'bgs to 83'bgs. Groundwater flow
<br /> elevations and depths to water, direction was generally towards the northeast. Groundwater gradient varied
<br /> from 0.0001 to 0.007 ft/ff.
<br /> LYJ 7. Tabulated results of all sampling All data adequately tabularized in various reports.
<br /> and analyses:
<br /> Y❑ Detection limits for confirmation
<br /> sampling
<br /> QY Lead analyses
<br /> 8. Concentration contours of contaminants found and those remaining in The extent of the identified contamination is
<br /> soil and groundwater, and both on-site and off-site: described in the available reports.
<br /> Lateral and ElVertical extent of soil contamination
<br /> Lateral and M Vertical extent of groundwater contamination
<br /> 71 9. Zone of influence calculated and assumptions used for subsurface Over-excavation and dual phase extraction
<br /> remediation system and the zone of capture attained for the soil and (DPE)were the engineered remediation.
<br /> groundwater remediation system;
<br /> 10.Reports/information 1Y Unauthorized Release Form QY QMRs (40) 7-90 to 12-11
<br /> n
<br /> Y Well and boring logs QY PAR �Y FRP �y Other Closure Report, 10-12;Addendum, 12112
<br /> YJ 11.Best Available Technology(BAT) used or an explanation USTs removal, over-excavation, DPE,and natural
<br /> for not using BAT; I attenuation.
<br /> Y ai 12. Reasons why background wash's Residual soil and groundwater contamination remains.
<br /> ttainable usin T,BA
<br /> Y Mass balance calculation of substance DPE removed 410 lbs of TPH.Approximately 44,563 lbs TPH remain in soil
<br /> and 42.7 gal. TPH remain in groundwater.
<br /> treated versus that remaining;
<br /> Y 14. Assumptions,parameters, calculations A soil vapor survey was not required by the regulatory agency. TPH
<br /> 7
<br /> and model used in risk assessments, and fate groundwater plume has remained onsite. F&T Model did not indicate risk
<br /> and transport modeling; to wells. Soil meets SWRCB low risk closure policy for commercial use to
<br /> Consultant states site does not represent a significant risk
<br /> Y115. Rationale why conditions remaining at site Soil and groundwater contamination reportedly are limited in extent.Land
<br /> will not adversely impact water quality, health, use(commercial)is not expected to change in the foreseeable future.A
<br /> or other beneficial uses;and fate and transport model shows that sensitive receptors are protected.
<br /> Consultant estimated WQGs will be reached by 2020.
<br /> By: JL Comments:In 10189, three 500-gallon and one 2,000-gallon waste oil USTs were removed,and in 9197, one
<br /> 2,000-gallon, one 7,500-gallon,and one 8,000-gallon gasoline USTs, and one 8,000-gallon and two
<br /> Date: 10,000-gallon diesel USTs were removed at the subject site. Residual soil and groundwater contamination
<br /> 3/12/2013 remains.Based upon the limited extent of contamination reported in soil and groundwater,a stable and
<br /> declining plume that has remained onsite,no foreseeable changes in future land use(commercial), and
<br /> minimal risks from groundwater,soil vapor and soil,Regional Board staff concur with San Joaquin County's
<br /> Closure Recommendation.
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