SITE INFORMATION AND CORRESPONDENCE

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r.. TABLE 1 -CHECKLIST OF REQUIRED_-TA FOR NO FURTHER ACTION REQUESTS AT UNDERGROUND TANK SITES Site Name and Location: Bank of the West(former Shell) 1267 Country Club Blvd., Stockton Y 1. Distance to production wells for municipal, domestic, A well survey conducted in 2001 did not identify any existing water agriculture, industry and other uses within 2000 feet Of the site; supply wells within a 2,000 feet radius of the site. The closest surface water body is the Smith Canal,about 1,200 feet up- Y radient south east of the site. 2. Site maps, to scale, of area impacted showing locations of former One 8,000-gallon, two 3,000-gallon,and one 2,000 gallon USTs and one 280-gallon waste oil tank were possibly and existing tank systems, excavation contours and sample locations, removed between March 1974 and December 1975. Site borings and monitoring wells elevation contours, gradients, and nearby maps showing approx.location of former tanks and Y surface waters, buildings, streets, and subsurface utilities; chemical distributions were provided in reports. 3. Figures depicting lithology(cross Cross-sections were provided in reports, no cleanup was implemented Y section). treatment system diagrams; 4. Stockpiled soil remaining on-site or No soil stockpiles remain on-site Y off-site disposal(quantity); 5. Monitoring wells remaining on-site, fate, 16 monitoring wells and 3 soil vapor probes will be properly destroyed under permit from the San Joaquin County Environmental Health Department when regulatory closure is determined to be appropriate. Y 6. Tabulated results of all groundwater Tabulated results of groundwater elevations and depth to water were provided in elevations and depths to water, reports Y 7. Tabulated results of all sampling and analyses: MDetection limits for confirmation sampling Tabulated results of sampling and analysis were provided in reports including ❑Y Lead analyses waste oil analytes. Y 8. Concentration contours of contaminants found and those remaining in soil and groundwater, and both on-site and off-site: Petroleum impacts detected in three water bearing zones investigated to a total depth of 90 feet below Lateral and ❑Y Vertical extent of soil contamination ground surface. Horizontal impacts detected 250 MLateral and ❑Y Vertical extent of groundwater contamination feet northeast from the site. N 9. Zone of influence calculated and assumptions used for subsurface No cleanup actions were implemented at this site. remediation system and the zone of capture attained for the soil and groundwater remediation system, Y 10.Reports/information 17 Unauthorized Release Form ❑Y QMRs ❑Y Well and boring logs E PAR ❑N FRP FY Other Y 11.Best Available Technology(BAT) used or an Monitored natural attenuation was the selected cleanup. . explanation for not using BAT, Y 12.Reasons why background was/is unattainable Groundwater is predicted to be restored for beneficial use in about 40 years using BAT 13.Mass balance calculation of substance Mass remaining in soil was calculated to be 88 lbs. (-14 gallons)and remaining Y mass in groundwater was calculated to be 3.5 lbs. (-',4 gallon) treated versus that remaining: 14.Assumptions, parameters, calculations and model used Remaining mass estimations were based on soil and Y in risk assessments, and fate and transport modeling; groundwater analytical data. 15.Rationale why conditions remaining at site will not Concentrations are decreasing and groundwater is expected to be y adversely impact water quality. health. or other beneficial restored to beneficial use in about 40 years. uses;and N 16.WET or TCLP results NA By Comments: The site was developed in 1949 as a Shell-branded service station, and ceased operation in 1974. Four j gasoline USTs and one waste oil UST reportedly operated at the site. There do not appear to be any records of whether these tanks were removed or abandoned in-place. A credit union currently occupies the site and the surrounding area is mixed commercial and residential. Vapor migration to neighboring residents was evaluated by collection of site specific data and no threat was observed. Water quality is expected to be restored for beneficial use Date: 1 in about 40 years. 1