SITE INFORMATION AND CORRESPONDENCE

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{ 13 TABLE 1 - CHECKLIST OF REQUIRED DATA FOR NO FURTHER ACTION REQUESTS AT UNDERGROUND TANK SITES ,t Site Dame and Location: Joe Wilson Center, 1141 Adams Street,Tracy,Sail Joaquin County 1.Distance to production wells for municipal, domestic, agriculture, As provided by the County, the nearest municipal well industry and other uses within 2000 feet of the site; is approximately 1,000 feet southeast of the site. itOne 1,500-gallon fuel oil ,. 2. Site maps, to scale, of area impacted showing locations of former and existing tank;systems, UST was removed in 11/01. ❑ I excavation contours and sample locations, boring and monitoring well elevation contours, Site maps are provided in gradients, and nearby surface waters, buildings,streets, and subsurface utilities; the UST Removal Report ❑ 3.Figures depicting lithology(cross section), treatment system diagrams; Soil investigation consisted of UST removal andoverexcavation of contaminated soils to 14 feet. A soil profile was not required. Approximately eight tons of impacted soil was excavated from the ❑ 4.Stockpiled soil disposed off-site(quantity); tank pit and disposed at Forward Landfill. i , 5.Monitoring wells remaining an-site, fate; Groundwater contamination was not identified,and monitoring wells were not installed. I4 Monitoring wells were not installed. First .r—N 1 6-Tabulated results of all groundwater elevations and depths to water, groundwater was identified at 14 feet in the tank pit Maximum soil contamination only showed diesel at 10,000 mg/kg, 7 Tabulated results of all sampling and analyses: which was later excavated and disposed off site. Lead was detected in ©Detection limits for confirmation sampling soil at 14 to 24 mg/kg, whlch is within background concentrations for Lead analyses this area. Groundwater grab samples from the tank pit were non- detect for all constituents including M(BE and fuel oxygenates. ❑ 8. Concentration contours of contaminants found and those remaining in soil 1 k Y Diesel impacted soil was excavated and and groundwater,and both on-site and off-site: °� disposed off-site. Groundwater Lateral and Vertical extent of sot!contamination contamination was not identified. ' Lateral and ❑ Vertical extent of groundwater contamination Based on the limited contamination,site 9.Zone of influence calculated and assumptions used for subsurface !{4 remediation beyond sall excavation and i remediation system and the zone of capture attained for the soil and disposal was not required. groundwater remediation system, 3 ❑ 10.Reports/information n Unauthorized Release Form QMRs Boring logs EI PAR El FRP UST Rer�r�ioval Report, 1/2002 1}❑ The USTs and contaminated soils were 11.Best Available Technology(BAT)used Oran explanation for not using BAT; removed. background Soil contamination was excav ted and disposed off-site. Groundwater ❑ 12 Reasons why warms contamination was not ldent1hed. unattainable using BAT, i3.Mass balance calculation of substance Based on the removal of contaminated soils and no detectable groundwater ❑ contamination,.an estimate of the remaining mass was not required. treated versus that remaining; Due to o detectable groundwater contamination,a risk El14.Assumptions,parameters,calculations and model used in risk assessment was not required. assessments, and fate and transport modeling; Y 15. Rationale why conditions remaining at site will not adversely Contaminated soils were disposed off-site,and ! groundwater contamination was not identified. impact water quality,health, or other beneficial uses;and By: Comments:A 1,500-gallon UST was removed from the site on 29 November 2001. The former UST was used to store fuel MH oil for heating boilers that were taken out of service poor to November12001. Sail contamination was identified during the UST removal at 12 feet, and 8.58 fans of impacted soil was removed and disposed at Forward Landfill in December 2001. The confirmation soil sample following overexcavation activities was non-detect for all constituents. Two groundwater grab for all t excava tect Date: samples constituents were including Mtfrom the tank BE and fuel oxrygenat st 315102 at appropriate detection limits, The former UST site isein a parking lot area for the Joe Wilson Center, which has been repaved with asphalt. Based on the site investigation and excavation activities completed to date, Board staff concur with San Joaquin County's closure recommendation.