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...c3LE 1 - CHECKLIST OF REQUIRED DATA
<br />FOR NO FURTHER ACTION REQUESTS AT UNDERGROUND TANK SITES
<br />Site Name and Location: River City Petroleum/Connell Motor Lift Truck, 2211 N. Wilson Way, Stockton, San Joaquin County
<br />(RB #390991/SC #SL186393610)
<br />y 1. Distance to production wells for municipal,
<br />agriculture, industry and other uses
<br />feet of the site.
<br />A 2012 sensitive receptor survey reported four (4) water supply
<br />wells located within 2,000' of the Site. The nearest wells are 1,000'
<br />to the west and 1,500' to the east. None of the wells are threatened
<br />by the release. An on-site water supply well was properly destroyed
<br />in 2007.
<br />domestic,
<br />within 2000
<br />7 2. Site maps, to scale, of area impacted showing
<br />of any former and existing tank
<br />excavation contours and sample
<br />boring and monitoring well elevation
<br />gradients, and nearby surface waters,
<br />streets, and subsurface utilities;
<br />In 10/86, two 10,000-gallon gasoline, and two 10,000-gallon diesel
<br />USTs were removed. In 6 /9 8, two 10,000-gallon gasoline and one
<br />10,000-gallon diesel USTs were removed. Between 1992 and 1998
<br />two 500-gallon waste oil tanks were removed from a lube pit. Site
<br />maps and figures showing tank locations, excavations, building
<br />and residual pollutants were provided in investigation reports.
<br />locations
<br />systems,
<br />locations,
<br />contours,
<br />buildings,
<br />Y 3. Figures depicting lithology (cross
<br />system diagrams;
<br />Site lithology consists of clay, silt, and sand to 248', the total depth
<br />investigated. Remediation consisting of SVE/AS was implemented from 2004
<br />to 2012. section), treatment
<br />Y 4. Stockpiled soil remaining on-site or
<br />(quantity);
<br />Approximately 200 tons of excavated soil was removed and initially stockpiled
<br />onsite. Soil was transported to Forward Landfill in Manteca. Mass estimate for
<br />excavated soil was not reported by the consultant. off-site disposal
<br />wells remaining on-site, 48 monitoring wells (MW-1 through MW-48) and 48 remediation wells (VW-1
<br />through VW-5, VW-6A through VW-19A, VW-6B through VW-19B, IAS-1 through
<br />IAS-14, and EW-1) were properly destroyed prior to closure.
<br />y 5. Monitoring
<br />fate;
<br />results of all groundwater
<br />depths to water;
<br />Tabulated data was provided in reports indicating depth to groundwater varied
<br />from 25' bgs to 63' bgs. Groundwater flow direction from northeast to
<br />northwest. Groundwater gradient varied from 0.0005 ft/ft to 0.015 ft/ft.
<br />Y 6. Tabulated
<br />elevations and
<br />[77 7. Tabulated results of all sampling
<br />limits for
<br />sampling
<br />analyses
<br />confirmation
<br />All data adequately tabularized in various reports.
<br />and analyses:
<br />Y Detection
<br />M Lead
<br />y 8. Concentration
<br />and
<br />and
<br />soil and groundwater,
<br />contours of contaminants
<br />and both on-site
<br />found and those remaining in
<br />and off-site:
<br />extent of soil contamination
<br />extent of groundwater contamination
<br />The horizontal and vertical extent of the
<br />petroleum and Stoddard pollution is
<br />confined to the property limits.
<br />Y Lateral Y Vertical _
<br />_y Lateral F Vertical
<br />influence calculated and assumptions used for subsurface
<br />system and the zone of capture attained for the soil and
<br />remediation system;
<br />The SVE treatment system zone of influence
<br />was approximately 25'.
<br />y 9. Zone of
<br />remediation
<br />groundwater
<br />Y 10. Reports / information Y Unauthorized
<br />boring logs171 PAR
<br />Release Form Y QMRs (54) 9-99 to 2-12
<br />FRP 171 Other Closure Report, 7-12 y Well and y
<br />Y 11.Best Available Technology (BAT) used or
<br />for not using BAT;
<br />Leak was stopped by removing tanks and piping. BAT was excavation
<br />and SVE/AS. an explanation
<br />y 12. Reasons why background was/is not
<br />BAT;
<br />Soil pollution presents a minimal threat to human health and
<br />groundwater pollution is predicted to be restored in 23 years. d a i na ble using
<br />calculation of substance
<br />that remaining;
<br />Initial mass estimates were 16,885 lbs (2,558 gal) TPH in soil and 313.2
<br />lbs. (47.5 gal) in groundwater; however, SVE/AS removed 41,097 lbs.
<br />(6,227 gal) from soil. Estimated residual TPH mass is 1.3 lb. (0.2 gal.).
<br />y 13.Mass balance
<br />treated versus
<br />parameters, calculations
<br />used in risk assessments, and
<br />modeling;
<br />Site meets the criteria in the LTCP for commercial use. Consultant states
<br />site does not represent a significant environmental or health risk. Y 14. Assumptions,
<br />and model
<br />fate and transport
<br />y 15. Rationale why conditions remaining at
<br />adversely impact water quality,
<br />other beneficial uses; and
<br />Soil and groundwater pollution is reportedly limited to the property
<br />boundaries. Land use (commercial) is not expected to change in the
<br />foreseeable future. WQGs will be reached by 2037. Groundwater plume is
<br />stable and slowly decreasing in concentration.
<br />site will not
<br />health, or
<br />By JLB Comments: Multiple USTs were removed at the subject site. Based on the stable and declining
<br />concentrations in groundwater, no foreseeable changes in future land use (commercial), and no risks from
<br />exposure to groundwater, soil vapor, and soil, Regional Board staff recommend closure under the State
<br />Water Resources Control Board Low Threat Closure Policy.
<br />Date
<br />4/15/2014
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