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TABL�'1 - CHECKLIST OF REQUIRED D IA <br /> FOR NO FURTHER ACTION REQUESTS AT UNDERGROUND TANK SITES <br /> Site Name and Location: California Highway Patrol, 3330 North Ad Art Road, Stockton, San Joaquin County <br /> 0 1. Distance to production wells for municipal, domestic, agriculture, A sensitive receptor survey was not completed. No <br /> industry and other uses within 2000 feet of the site; groundwater impact at this site. <br /> 2. Site maps, to scale, of area impacted showing locations of former and existing tank systems, One UST was removed in <br /> excavation contours and sample locations, boring and monitoring well elevation contours, May 2000. Site maps are <br /> gradients, and nearby surface waters, buildings, streets, and subsurface utilities; provided. <br /> J. Figures depicting lithology(cross section), treatment system diagrams; Soil borings show silt and minor clay to 55 feet, <br /> and silty sand to 58 feet. <br /> 4. Stockpiled soil remaining on-site or off-site disposal(quantity); Disposition of excavated soil was not presented. <br /> p g p (q y); <br /> N <br /> 5. Monitoring wells remaining on-site, fate;_ No monitoring wells were installed. <br /> 0 6. Tabulated results of all groundwater elevations and depths to water; Depth to water was measured at 56 feet in <br /> June 2000. Groundwater direction unknown. <br /> ED7. Tabulated results of all sampling and analyses: March 1999 maximum soil contamination shows MtBE at 0.008 mg/kg. <br /> Detection limits for confirmation sampling All other constituents were non-detect. Soil and groundwater samples <br /> © <br /> collected in June 2000 were non-detect for all constituents. No <br /> F Lead analyses indication of lead analysis. <br /> 0 8. Concentration contours of contaminants found and those remaining in soil <br /> and groundwater, and both on-site and off-site: Lateral and vertical extent of soil and <br /> © Lateral and F Vertical extent of soil contamination groundwater contamination is defined. <br /> 171 Lateral and 19 Vertical extent of groundwater contamination <br /> D9. Zone of influence calculated and assumptions used for subsurface <br /> remediation system and the zone of capture attained for the soil and A remediation system was not operated at <br /> groundwater remediation system; this site. <br /> FTI 10.Reports/information Unauthorized Release Form [R] QMRs <br /> Boring logs PAR 0 FRP Other(Closure Report) <br /> 11.Best Available Technology(BAT) used or an explanation for not using BAT; Remove UST. <br /> ED12.Reasons why background was/is <br /> unattainable using BA T: Low levels of MtBE remain in on-site soil near the former UST. <br /> 13.Mass balance calculation of substance <br /> treated versus that remaining; A mass balance was not completed. <br /> 14.Assumptions,parameters, calculations and model used in risk <br /> assessments, and fate and transport modeling; A risk assessment was not completed. <br /> 0 15. Rationale why conditions remaining at site will not adversely Contamination is limited to soils adjacent to the former <br /> impact water quality, health, or other beneficial uses;and UST. Groundwater has not been impacted, and the UST <br /> has been removed. <br /> By: Comments: The site is currently a California Highway Patrol office. In March 1999, four soil borings around the existing <br /> P1fiberglass UST identified MtBE in soil at a maximum of 0.008 mg/kg. The 12,000-gallon gasoline UST was subsequently <br /> removed from the site in May 2000. Four soil borings were completed to 58 feet in June 2000, and eight soil samples and <br /> four groundwater samples were non-detect for all constituents. No monitoring wells have been installed. Based on the <br /> Date: soil and groundwater investigation completed, and the lack of groundwater contamination, Board staff concur with San <br /> �Z3/oI Joaquin County's closure recommendation. <br />