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3 <br /> r low, <br /> TABLE 1 - CHECKLIST OF REQUIRED DATA <br /> FOR NO FURTHER ACTION REQUESTS AT UNDERGROUND TANK SITES <br /> Site[Dame and Location: Payless Building, 532 Lockeford, Lodi, San Joaquin County <br /> 0 1. Distance to production wells for municipal, domestic, agriculture, industry <br /> and other uses within 2000 feet of the site; <br /> 2. cite maps. to scale, of area impacted showing locations of former and existing tank systems, 550-gal gas tank removed <br /> excavation contours and sample locations. boring and monitoring well elevation contours, 7193-MW-1 middle of tank <br /> gradients, and nearby surface waters, buildings, streets, and subsurface utilities; excavation to TD 55 ft bgs <br /> 0 3. Figures depicting lithology(cross section), treatment system diagrams; one boring log <br /> Q 4. Stockpiled soil remaining on-site or off-site disposal(quantity); <br /> ED 5. Monitoring wells remaining on-site, fate; 1 <br /> 0 6. Tabulated results of all groundwater elevations and depths to water; 46.5 ft bgs <br /> 7.Tabulated results of all sampling and analyses: <br /> 0 Detection limits for confirmation sampling <br /> RLead analyses <br /> 8. Concentration contours of contaminants found and those remaining in soil Soil: extends from 8.5 ft beneath the tank <br /> and groundwater, and both on-site and off-site: to 35 ft bgs. GW low concentrations of <br /> Y Lateral and Vertical extent of soil contamination TPH-g, BTEX and ND for MTBE and <br /> oxygenates. <br /> y Lateral and ay Vertical extent of groundwater contamination <br /> NA 9. Zone of influence calculated and assumptions used for subsurface <br /> remediation system and the zone of capture attained for the soil and <br /> groundwater remediation system; <br /> 10.Reports/information FlUnauthorized Release Form 8/2/93 YI QMRs(Dates) 8/26/97 to 1/27/98 <br /> Other(report name) Gas Tank Removal 9/30/97 <br /> R Welland boring logs E PAR FRP <br /> 0 11.Best Available Technology(BAT)used or an explanation for not using BAT Removed tank,no soil excavated highest <br /> contamination 20-30 ft-bgs at silty clay <br /> Q12.Reasons why background wasrs unattainable using BAT, Soil contamination too deep and concentration no <br /> enough to justify soil removal, GW low concentrations <br /> 0 13.Mass balance calculation of substance treated versus that remaining; <br /> 0 14.Assumptions, parameters, calculations and model used in risk Tank removed in 1993 not impacting GW significantly <br /> assessments, and fate and transport modeling; <br /> Q15.Rationale why conditions remaining at site will not adversely GW presently occurs 11 ft beneath lowest impact of soil <br /> impact water quality, health, or other beneficial uses,and contamination. GW concentrations low. GW historically <br /> occurs at lower depths. <br /> NA 16.INET or TCLP results <br /> By Comments:Remaining soil contamination 8.5 ft beneath the tank to 35 ft bgs, 1 to 1590 mg/kg TPH-g, <br /> ND to 4-19 mg/kg benzene, ND to 4.99 mg/kg toluene, 3 to 37.8 mg/kg efhylbenzene, 25 to 73.9 <br /> p mg/kg xylene, ND MTBE and other oxygenates. GW contamination ND TPH-g, MTBE and other <br /> oxygenates, 1-4 pg/1 benzene, 1-2 gg/1 toluene, 0.3 µg/l ethylbenzene, 2-3 jig/1 xylene. <br />