SITE INFORMATION AND CORRESPONDENCE

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`WTABLE 1 -CHECKLIST OF REQUIRED DATA FOR NO FURTHER ACTION REQUESTS AT UNDERGROUND TANK SITES Site Name and Location: Jay's Mini Mart,3392 We Lane,Stockton,San JoCounty San Joaquin Cou�Jndiates thatthisisonly a In istance to prduction wellsformunicpal, domestic, agriculture,industry soil case. A well has not been and other uses within 2000 feet of the site; conducted. in 1997,three USTs(two 8,000- ETI 2. Site maps, to scale, of area impacted showing locations of former and existing tank systems, gallon and one 10,000-gallon excavation co.Ontours and sample locations, boring and monitoring well elevation contours, gasoline),associated piping, gradients, and nearby surface waters, buildings, streets,and subsurface utilities; from the snte rs were removed ❑Y 3. Figures depicting lithology(cross section), treatment system diagrams; No treatment system was used. Approximately 400 cubic yards of impacted soil were removed 0 4. Stockpiled soil remaining on-site or off-site disposal(quantity); and disposed of off-site. NA 5 Monitoring wells remaining on-site, fate; No monitoring wells were installed at the site. 71 6. Tabulated results of all groundwater elevations and depths to water,• 7.Tabulated results of all analyses: In 1997,high levels of TPHg,benzene,ethyl benzene,and TPHd were detected ❑ sampling p g and anay in soil at the site. The tank field was over-excavated,reducing hydrocarbon Y Detection limits for confirmation sampling concentrations. MISE was detected in soil under the dispensers as high as ❑Lead analyses 0.650 mg/kg. Groundwater was not encountered nor sampled. N 8. Concentration contours of contaminants found and those remaining in soil .gad groundwater, and both -site and off-site: 1 l.._ Lateral and [Vertical extent of soil contamination Lateral and EE] Vertical extent of groundwater contamination FWA-1 9,Zone of influence calculated and assumptions used for subsurface No subsurface remediation system was used at remediation system and the zone of capture attained for the soil and this site. groundwater remediation system; 0 10.Reports/information El NA Unauthorized Release Form MRs(Dates) 0 Well and boring logs N❑PAR 0 FRP 0 Other(report name)March 20, 1998 UST Removal Report 0 11.Best Available Technology(BAT)used or an explanation for not using BAT,• The leak sources(tanks and soil)were removed from the site. 12.Reasons why background wasris unattainable using BAT,• 13.Mass balance calculation of substance treated versus that remaining; 14.Assumptions,parameters, calculations and model used in risk assessments, and fate and transport modeling; 0 15.Rationale why conditions remaining at site will not adversely impact water quality, health, or other beneficial uses,and Fl 16.WET or TCLP results By. Comments: Elevated levels of fuel constituents were detected in soil beneath the former USTs and dispensers. The tank site was Y /1' over-excavated,removing about 400 cubic yards of soil. Confirmation soil samples in this area showed significant reduction Datp: hydrocarbon contaminants. MtBE was found in soil samples three to four feet beneath the fuel dispensers. Groundwater was not / encountered during the tank removal and excavation activities. Because groundwater samples were not collected and analyzed,we are unable to determine whether groundwater is impacted. Until we receive analytical data that confirms the presence or-absence of ((( MtBE and other contaminants in groundwater,we cannot concur with San Joaquin County closure recommendation at this time.