SITE INFORMATION AND CORRESPONDENCE

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€ �l a TABS 1 - CHECKLIST OF REQUIRED WTA . FOR NO FURTHER ACTION REQUESTS AT.UNDERGROUND TANK SITES Site Name and Location: Joe Wilson Center, 1141 Adams Street,Tracy,San Joaquin County ETI 1. Distance toroduction wells for munici al, domestic agriculture, As provided by the County, the nearest municipal well P A industry and other uses within 2000 feet of the site; is approximately 1,000 feet southeast of the site. 2. Site maps, to scale, of area impacted showing locations of former and existing tank systems; One 1,500-gallon fuel oil excavation contours and sample locations, boring and monitoring well elevation contours, UST was removed in 11/01. gradients, and nearby surface wafers, buildings, streets,and subsurface utilities,, Site maps are provided in 1� the UST Removal Report N❑ 3. Figures depicting lithology(cross section), treatment system diagrams; Soil investigation consisted of UST removal and overexcavadon of contaminated soils to 14 feet A soil profile was not required F714. Stockpiled soil disposed off-site(quantify); approximately eight tons of impacted soil was excavated from the tank pit and disposed it Forward Landfill. 4 0 5. Monitoring wells remaining on-site, fate; Groundwater contamination was not identified,and monitoring wells were not installed. —7Tebulafed results of=all-roundwater elevations andile ihs fo wafer Mani rFng wells were not installed. First ff g p groundwater was identified at 14 feet in the tank pit Y 7.Tabulated results of all sampling and analyses: Maximum soil contamination only showed diesel at 10,000 mg/kg, I Defection limits for confirmation sampling which was later excavated and disposed off site. Lead was detected in soil at 14 to 24 mg/kg,which is within background concentrations for Lead analyses this area. Groundwaterlgrab samples from the tank pit were non- defect for all constituents including MtBE and fuel oxygenates. E] 8. Concentration contours of contaminants found and those remaining in soil !j and groundwater, and both on-site and off-site: Diesel impacted soil was excavated and Lateral and �� disposed o 9 Vertical extent of soil contamination off-site. Groundwater Lateral andF] Vertical extent of groundwater contamination contamination was not identified. 'f 09.Zone of influence calculated and assumptions used for subsurface Based on the limited contamination,site N A �° remediation system and the zone of capture attained for the soil and remediation beyond soil excavation and groundwater remediation system; disposal was not required. r 10.Reports/information lin Unauthorized Release Foran N� QMRs LJ � N❑ Boring logs EIPAR � FRP UST Removal Report, 1/2002 11.Best Available Technology(BAT)used or an explanation for not using BA T. ii The'USTs and contaminated soils were removed. [ Soil contamination was excavated andoff-site.disposed o -site. Groundwater Q 12.Reasons why background was/is unattainable using BAT; contamination was not identified. _ �--4.-... - -�,..:r -�^""E'.�'=c.rte--,-�—�_.-.--'•'•.'�W".�-�,�..:I�:..-.'�'. .:��„"•�'�._......._...._... Based on the removal of contaminated soils and no detectable roundwater 13.Mass balance calculation of substance , g contamination, an estimate of the remaining mass was not required. treated versus that remaining; I 14.Assumptions,parameters, calculations and madel used in risk Due to no idetectable groundwater contamination,a risk I" assessments, and fate and transport modeling; assessment was not required !' 15. Rationale why conditions remaining at site will not adversely Contaminated soils were disposed off-site, and impact water quality, health, or other beneficial uses;and groundwater contamination was not identified. i! 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 prior to November 2001. Soil contamination was identified during the UST removal of 12 feet, and 8.58 tons of impacted soil was removed and'disposed at Forward Landfill in December 2001. 'i The confirmation soil sample following overexcavation activities was non-detect for all constituents. Two groundwater grab Date: samples were collected from the tank pit excavation following overexcavafi'on activities and were non-detect for all I 315102 constituents including.MfBI=and fuel oxygenates at appropriate detection limits. The former UST site is in 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. r I� it .