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TOE 1 -CHECKLIST OF REQUIRED DATj*
<br /> FOR NO FURTHER ACTION REQUESTS AT UNDERGROUND TANK SITES
<br /> Site Name and Location: ARCianreports.ation No. 0760, 225 S. Cherokee Lane., Lodi,San Joaquin County LUSTIS#390330
<br /> Y 1. Distance to production for municipal, domestic, One municipal well is located 812' east of the site.
<br /> agriculture, industry and uses within 2000 feet of the site;
<br /> One 550-gallon waste oil UST was removed 9/88.
<br /> Y 2. Site maps, to scale, of impacted showing locations of Two 6000-gallon and one 8000-gallon gasoline, and
<br /> former and existing tank ms, excavation contours and one 400-gallon waste oil USTs were removed and
<br /> sample locations, boringmonitoring well elevation contours, replaced 7-91. A second release was discovered
<br /> gradients, and nearby suwaters, buildings, streets, and from the four 10,000-gallon gasoline USTs removed
<br /> subsurface utilities; 8-02. USTs are not current) located onsite.
<br /> Y 3. Figures depicting litho (cross section), treatment system Site total de consists of gravel, sand, silt,and clay.
<br /> The total depth investigated was 105 feet.
<br /> dia rams:
<br /> 4. Stockpiled soil dispos -site Approximately 300 tons of soil excavated in 1991, and 45 tons of soil
<br /> excavated in 2002,were transported offsite to an unnamed location.
<br /> Y uanti ;
<br /> Y 5. Monitoring wells remaon-site, All remaining monitoring wells (MW-1 through MW-9), and SVE wells (VW-1
<br /> fate; through VW-13) installed for this investigation and remediation were properly
<br /> abandoned 28 October 2009.
<br /> Y 6. Tabulated results of aundwater elevations The depth to water varied from 54 to 66 feet. The direction of
<br /> and depths to water, groundwater flow varied from southeast to east at a gradient varying
<br /> from 0.0005 ft/ft. to 0.018 ft/ft.
<br /> Y 7.Tabulated results of apling and The results of the investigation are adequately described in the available
<br /> eports.
<br /> analyses:
<br /> Detection limits for confirmation sampling
<br /> Lead analyses
<br /> Y 8. concentration contours of contaminants found and those The extent of contamination was defined by soil
<br /> ,Tfnaining in so d groundwater, both on-site and off-site: borings, and monitoring wells
<br /> MLateral and Y Vertical extent of soil contamination
<br /> Lateral and Vertical extent of groundwater contamination
<br /> NSVE was the engineered remediation system for the
<br /> 9. Zone of influence calculated and assumptions used for first release discovered in 1991. Natural attenuation
<br /> subsurface remediation system and the zone of capture attained was conducted for the second release discovered in
<br /> for the soil and groundwater remediation system; 2002.
<br /> 7Y1 10.Reports/information ly I Unauthorized Release Form 25 QMRs (10/02 to 10/08)
<br /> 0 Boring logs 0 PAR El FRP El Other. Closure Reports 2005, 2006, and 2009
<br /> Y 11.Best Available Technology(BAT) used or an explanation for Remove USTs, over-excavation, SVE, and natural
<br /> not usin BAT; attenuation.
<br /> Y 12.Reasons why background was/is unattainable using Minimal soil contamination remains on-site and leaching to
<br /> groundwater is still occurring,though at a much-reduced rate,
<br /> BAT; and is not migrating or threateninguses of water..
<br /> The consultant estimated TPHg and TPHd remaining in soil,
<br /> Y 13.Mass balance calculation of substance treated versus 3,120 gallons, and remaining mass in groundwater as
<br /> that remaining; TPH /MTBE/1, 2-DCA, 2 gallons.
<br /> Y 14. Assumptions,parameters, calculations and The consultant compared the 5/07 soil vapor sample results to Region
<br /> model used in risk assessments, and fate and 2 ESLs for vapor intrusion for commercial use and passed.
<br /> trans ort modeling;and
<br /> y 15. Rationale why conditions remaining at site will Soil contamination is limited in extent. Since 2002, 25 quarters of
<br /> not adversely impact water quality, health, or other groundwater
<br /> monitoring
<br /> data
<br /> show
<br /> including a decline
<br /> tBE and 1 concentrations for
<br /> beneficial uses. petroleum
<br /> By: Comments: One 550-gallon waste oil UST was removed 9/88. Two 6000-gallon and one 8000-gallon gasoline, and
<br /> JLq J one 400-gallon waste oil USTs were removed and replaced 7-91. A second release was discovered from the four
<br /> 10,000-gallon gasoline USTs removed 8-02. USTs are not currently located onsite. The consultant compared the soil
<br /> Date: vapor results to Region 2 ESLs for vapor intrusion for commercial use and passed. No wells are threatened by residual
<br /> petroleum hydrocarbons. Residual soil and groundwater contamination remains on site. Groundwater is estimated to
<br /> 12115/2oog reach WQGs in one year. Future land use as a used car lot and repair shop on the commercial corner of South
<br /> Cherokee Ln. and Oak St. is unlikely to change before WQGs are reached. No Further Action Required is appropriate
<br /> for this site.
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