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ABLE 1 -CHECKLIST OF REQUIRED DA ' yy <br /> FOR NO FURTHER ACTION REQUESTS AT UNDERGROUND TANK SITES <br /> Site Name and Location: Bernard Weaver Trucking,777 Locust Street,Ripon,San Joaquin eounty <br /> E The closure summarydoes not include a well <br /> M 1. Distance to production wells for municipal, domestic, agriculture, industry <br /> and other uses within 2000 feet of the site; survey. San Joaquin County indicates that the <br /> waste ail release does not affect.drinking water <br /> wells: <br /> Y 2. Site maps, to scale, of area Impacted showing locations of former and existing tank systems, in,lune 1991,a 750-gation waste ` <br /> excavation co.Ontours and sample locations, boring and monitoring well elevation contours, oil tank was removed horn the <br /> gradients, and nearby surface waters, buildings, streets, and subsurface utilities; sire. �yy <br /> EDtreatment was used. 1 <br /> 3. Figures depicting lithology(cross section), treatment system diagrams; No <br /> 0 4. Stockpiled soil remaining on-site or of-site disposal(quantity); , <br /> k <br /> NA 5. Monitoring wells remaining on-site, fate; No monitoring wells were installed.. <br /> I 6. Tabulated results of all groundwater elevations and depths to water, Groundwater was encountered at 21 feet bgs during the <br /> advancement of one investigative soil boring. <br /> After the waste oil tank was removed,290 mg/kg of hydrocarbons were <br /> 7. Tabulated results of all sampling and analyses: detected in soil samples from the tank excavation. BTEX was not defected. In <br /> Detection limits'for confirmation sampling 1999,soil and groundwater samples were analyzed for TPHg, TPHd,BTEX,and <br /> N❑lead analyses,, MtBE using EPA Method 8020. San Joaquin County stated that MtBE. <br /> defections would.have been confirmed with Method 8260. No contaminants <br /> associated with the LIST release were detected in'the samples. <br /> 8. Concentration contours of contaminants found and those remaining in soil <br /> Md groundwater, and bot -site and off-site: <br /> U Lateral and Vertical extent of soil contamination <br /> 0 Lateral andN] Vertical extent of groundwater contamination <br /> NA <br /> 9. - <br /> one of influence calculated and assumptions used for subsurface No subsurface remediation system was used at <br /> remediation system and the zone of capture attained for the soil and this site. <br /> groundwater remediation system; <br /> NA <br /> 1 O.Reports/informationUnauthorized Release Form MRS(Dates) <br /> Y❑ Welland boring logs N❑PAR NA FRP 0 Other(report name)4 October 1999 Closure Summary <br /> 11.Best Available Technology(BA 7)used or an explanation for not using BAT; The leak sources were removed from the site. <br /> `"" "' " ''�`"" i'` Contaminants ro <br /> fm the UST release were not Wefectedin soil and <br /> Q 12.Reasons why background was4s unattainable using BAT,' <br /> groundwater samples during the 1999 subsurface investigation. <br /> _ 13.Mass balance calculation of substance treated versus that remaining, <br /> EN <br /> NA 14.Assumptions,parameters, calculations and model used in risk <br /> assessments, and fate and transport modeling; <br /> Y <br /> 15.Rationale why conditions remaining at site will not adversely <br /> impact water quality, health, or other beneficial uses;and r <br /> N <br /> 16.WET or TCLP results <br /> By.. Comments: In 1991,elevated levels of TPN were detected in soil samples after the removal of the waste oil UST. In 1999,a single <br /> GeoprobeO was advanced in the center of the former UST pit to 21 feet bgs. Soil and groundwater samples were analyzed for <br /> (]at TPHd, TPHg, BTEX, and MtBE. No contaminants above detectable limits were detected in the samples. Based on the information <br /> provided and the absence of contaminants during Geoprobe®investigation,staff concurs with San Joaquin County closure <br /> recommendation. <br /> C <br />