SITE INFORMATION AND CORRESPONDENCE

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TABLE 1 - CHECKLIST OF REQUIRED DATA FOR NO FURTHER ACTION REQUESTS AT UNDERGROUND TANK SITES Site Name and Location. Flag City Chevron #9-0302,6421 Capitol Ave., Lodi, San Joaquin up t yWell is 450'west of the agriculture, The nearest supp Y wells are USTs. Additional supply Y 1. Distance to production wells for municipal, domestic, ag approximately 700'and 2000'southeast, and industry and other uses within 2000 feet of the site. 1 150'and 1500'north of the Site. Four 10,000-gallon gasoline and one 12,000- 1 Site maps, to scale, of area impacted showing locations of any former and existing tan gallon diesel LISTS were systems, excavation contours and sample locations, boring and monitoring well elevation emoved and replaced contours, gradients, and nearby surface waters, buildings, streets, and subsurface utilities; 3/95. Site IithologY consists of clay, silt, and sand Y 3. Figures depicting IithologY(cross section), treatment system diagrams; to 150 feet, the total depth investigated. Approximately 180 Y of soil was removed during the posal(quantity) Y 4. stockpiled tank removal. The fate of the soil is not presented in the kpiled soil remaining on-site or off-site disavailable re orts. 2012. All monitoring wells were properly abandoned by 16 February Y 5. Monitoring wells remaining on-site, fate; Depth to groundwater varied from 5 to 15 feet below ground surface. The 6. Tabulated results of all groundwater groundwater gradient varied from 0.001 to 0.003 ft/ft, and the elevations and depths to water; down radient direction was predominantI to the southeast. All data adequately n tabularized in various reports. 7. Tabulated results of all sampling and analyses: Detection limits for confirmation sampling Lead analyses The extent of contamination is 8. Concentration contours of contaminants found and those remaining in soil an adequately defined by soil borings monitoring wells. groundwater, and both on-site and off-site: El Lateral and El Vertical extent of soil contamination © Lateral and © Ve tical extent of groundwater contamination roved active remediation was soil overexcavation and 9. Zone of influence calculated and assumptions used for subsurface emediation system pp and the zone of capture attained for the soil and groundwater remediation system; groundwater pump and treatment. 5/91 to 12/06 10.Reports/information yUnauthorized Release Form ❑Y QMRs approximately 45, from ❑y Well and boring logs ❑y PAR MY FRP Y Other, Closure Summary Report 10/05 BAT used oran explanation for not using BAT; USTs removal, overexcavation, Y 11.Best Available Technology(BAT) groundwater pump and treatment, and natural attenuation. Minor residual soil and groundwater contamination Y 12.Reasons why background wasls unattainable using BAT; remain. Consultant estimates 0.25 gallons of MTBE remains onsite in Y 13.Mass balance calculation of substance treated versus soil, and 0.28 gallons of MTBE remains in groundwater, that remaining; 1, 14. Assumptions, parameters, calculations and model used in potent al for vapor intrusion.risk assessment PaSSeO e -oil and the Fate andtransport P risk assessments, and fate and transport modeling; modelin showed no risk to sensitive receptors, ater Y 15. Rationale why conditions remaining at site will not adversely Soil and grow will be met in 8 years.are limited in impact water quality, health, or other beneficial uses; and dies lon By: JLB at the subje t Site. Based ul pori evidence of a stable plume)with declining concentrations, replaced and no threat to supp Date: wells, limited risk of vapor in or direct contact exposure, no chae to Site use(commercial) , and ng 311612012 limited extent of contamination present in soil and groundwater, Regional Board stall recommends closure for the Site.