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4 <br /> R <br /> TABLE 'I - CHECKLIST OF REQUIRED DATA <br /> FOR NO FURTHER ACTION REQUESTS AT UNDERGROUND TANK SITES <br /> Site Name and Location: Former Town 8k Country Chevron, 13336 E. H.wy.88, Lockeford, San Joaquin County <br /> i <br /> 1.Distance to production wells for municipal, domestic, agriculture, industry an'd' Mokelumne River 1 mi North and West <br /> other uses within 2000 feet of the site; Bear Creek 3/4 mi southeast <br /> 0 2. Site maps..LQ scale, of area impadad showing locations of farmer and existing tank systems. need subsurface utilities <br /> excavation contours g1nd sample locations,, boring and monitoring well elevation contours, 10,000 gal reg.,5,000-7,000- <br /> gradients, and nearby s rf wa ers buildings, re and subsurface utilitles` gallon unleaded,550-gallon <br /> waste oil removed 1991 <br /> 3. Figures depicting lithology(cross section), treatment system,diagrams; on-site geologic logs contain limited info. <br /> Regional geologic logs complete <br /> 0 4.Stockpiled soil remaining on-site or off-site disposal(quantity); Unknown amount disposed off-site <br /> 6 barrels o'is (drill cuttings) disposed at Forward <br /> --� � <br /> .. B borin-`s alesfro a <br /> 5. Monitoring wells remaining on-site, fate; 9` Yw d <br /> 6. Tabulated results of all groundwater elevations and depths to water, Borings to 30 ft bgs ground water not encountered <br /> SJ Closure Summary 70-100 ft bgs <br /> 0 7.Tabulated results of all sampling and analyses: MTBE Detection limits 0.05 to 36 mg/kg needs to be 0.05 mg/kg <br /> Other oxygenated defection limits 0.4 to 8 mg/kg <br /> FYIDetection limits for confirmation sampling <br /> Y�Lead analyses <br /> NA 8. Concentration contours of contaminants oun nd Lhp2e remaining in 70 L TPH-g and BTEX extend laterally beyond <br /> and groundwater, and both n- !e and off-site: B-3,4, and 5,beneath Maintenance Shop <br /> 8 Lateral and N Vertical extent of soil contamination and extend vertically beyond 26 ft bgs in <br /> Latera!and B-1 and 21 ft in B-5 Vertical extent of <br /> N N Vertical extent of groundwater contamination initial release not defined <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 /> El 10.Reports/information ❑Y Unauthorized Release Form 2/17/68&8/27/91 '❑N QMRs(Dates) <br /> Welland boring logs Other(report name) Subsurface Environmental Investigation 9/8/97 8 11/9/97 <br /> I <br /> .iv+!!4.' — . . . "--'='-���rt -•-.r�a...��-- _ -� <br /> N�'11:BestAvailable Technology(BAT)u_.sed-�.+r. :wor�arn.' -expianation forn._ <br /> atit using BAT, contaminated soil temainsladditianatT <br /> remediation may be required <br /> 0 12.Reasons why background waslis unattainable using BAT; Contamination'beneath bldg, and portion not beneath <br /> bldg. extends to greater than 26 ft bgs. <br /> 0 13.Mass balance calculation of substance treated versus that remaining; Vertical extent of contamination unknown <br /> . i <br /> N❑ 14.Assumptions, parameters, calculations and model used in risk RBCA needs to be conducted to determine the effect of <br /> assessments, and fate and transport modeling; benzene on indoor air quality <br /> f 5 <br /> 15.Rationale why conditions remaining at site will not adversely Vertical extend of contamination is greater than 26 ft <br /> impact water quality, health, or other beneficial uses;and bgs. Water table 70-100 ft bgs. Contamination could <br /> extend to water table. <br /> 16.WET or TCLP results Need to determine the concentration of contaminated water <br /> migrating through the vadose zone to potentially impact gw i <br /> By: Comments: Board staff do not concur with San Joaquin County, 'Further investigation is needed at this site <br /> Yto determine the vertical extent of soil contamination due fo the'initial release of petroleum contaminants. <br /> DatI The initial contamination may have impacted ground water. <br /> _ 4 i <br />