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TABS 1 - CHECKLIST OF REQUIRED 64TA <br /> FOR NO FURTHER ACTION REQUESTS AT UNDERGROUND TANK SITES <br /> Site Name and Location: City of Stockton Fire Station#7, 1767 West Hammer Lane, Stockton,San.Joaquin County <br /> END 1. Distance to production wells for municipal, domestic, agriculture, industry No well survey completed. San Joaquin <br /> and other uses within 2000 feet of the site; county staff indicated no nearby drinking <br /> water wells. <br /> 2. Site maps, to scale, of area impacted showing locations of former and existing tank systems, See San Joaquin County file <br /> excavation contours and sample locations, boring and monitoring well elevation contours, <br /> gradients, and nearby surface waters, buildings, streets, and subsurface utilities; <br /> 3. Figures depicting lithology(cross section), treatment system diagrams; Soil boring logs included in San Joaquin <br /> y County casefile. <br /> N <br /> 4. Stockpiled soil remaining on-site or off-site disposal(quantity); No soil stockpile <br /> 5. Monitoring wells remaining on-site, fate; No monitoring wells were installed on-site. <br /> NA 8. Tabulated results of all groundwater elevations and depths to water, Historic groundwater elevation reported between 25 <br /> and 40 feet bgs. <br /> 7.Tabulated results of all sampling and analyses: Initial soil sample reported 4,140 mg/Kg TPHd.Samples collected <br /> Detection limits for confirmation sampling during soil boring program identified the extent of soil contamination. <br /> FNJ Lead analyses <br /> 8. Concentration contours of contaminants found and those remaining in soil Soil contamination appears to have been <br /> NaW groundwater, and bot -site and off-site: isolated to the UST area. Soil borings <br /> Lateral and �vertical extent of soil contamination identified contamination between 13 and 16 <br /> feet bgs. Low concentrations of TPHd, T <br /> Lateral and vertical extent of groundwater contamination and X detected in groundwater sample. <br /> NA 9.Zone of influence calculated and assumptions used for subsurface N/A <br /> remediation system and the zone of capture attained for the soil and <br /> groundwater remediation system; <br /> El10.Reports/information 0 Unauthorized Release Form N❑QMRs(Dates) <br /> R Well and boring logs El PAR(97) 0 FRP FY1 Other(report name) Closure Summary Report(10/19/98) <br /> 11.Best Available Technology(BAT) used or an explanation for not using BAT,• No remediation required by SJCEHD. <br /> FNAJ 12.Reasons why background wasris unattainable using BAT; N/A <br /> 0 13.Mass balance calculation of substance treated versus that remaining, approximately 20 gallons of TPHd remains is <br /> soil below and near the former UST. <br /> NA 14.Assumptions, parameters, calculations and model used in risk N/A <br /> assessments, and fate and transport modeling; <br /> 15.Rationale why conditions remaining at site will not adversely Low concentrations of TPHd reported in groundwater. <br /> impact wafer quality, health, or other beneficial uses;and <br /> 0 16.WET or TCLP results <br /> By;1pk? Comments: An estimated 20 gallons of TPHd remains in soil below the former UST to approximately 16 feet bgs. <br /> Groundwater is reported at 25 to 40 feet below ground surface. very low concentration of TPHd, Tan d X are present <br /> Date: in groundwater. Benzene and MTBE were not present in soil or groundwater above the laboratory reporting limits. <br /> /l}(� Closure concurrence appears warranted. <br />