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: Sun West Liquors, 2449 W. Kettleman Lane, Lodi, San Joaquin County 0 1. Distance to production wells for municipal, domestic, agriculture, industry There is no evidence of groundwater and other uses within 2000 feet of the site; contamination, and SJCEHD did not believe a well survey warranted. YD 2. Site maps, to scale, of area impacted showing locations of former and existing tank systems, 3 USTs + piping removed, excavation contours and sample locations, boring and monitoring well elevation contours, 5 soil borings advanced In gradients, and nearby surface waters, buildings, streets, and subsurface utilities; the area of the impacted UST excavation. N 3. Figures depicting lithology (cross section), treatment system diagrams; Soil boring logs were not included. 4. Stockpiled soil remaining on-site or off-site disposal (quantity); 5. Monitoring wells remaining on-site, fate; Groundwater was not encountered to 37 feet bgs in soil borings. No monitoring wells were installed. N6. Tabulated results of all groundwater elevations and depths to water; NIA 7. Tabulated results of all sampling and analyses: Initial soil sample results from UST excavation at time of tank pull: 4400 ppm TPHg, 6.1 ppm benzene, 10000 ppb MTBE. Sampling during y Defection limits for confirmation sampling soil boring program: all samples ND. Overexcavation sampling: 120 FNJ Lead analyses ppm TPHg, no benzene or fuel oxygenates. 08. Concentration contours of contaminants found and those remaining in soil The lateral and vertical extent of soil aad groundwater, and bot -site and off-site: contamination has been defined. The only Lateral and l_ 1 Vertical extent of soil contamination soil impact is near the former UST excavation. No groundwater contamination 0 Lateral and FN Vertical extent of groundwater contamination has been observed. N� 9. Zone of influence calculated and assumptions used for subsurface NIA remediation system and the zone of capture attained for the soil and groundwater remediation system; 0 10. Reports /information Ey Unauthorized Release Form nN OMRs (Dates) ❑N Welland boring logs H PAR 0 FRP FY1 Other (report name) Rpt of Site Investigation 71 11. Best Available Technology (BAT) used or an explanation for not using BAT, FN 1 12. Reasons why background wasrs unattainable using BAT; NIA 13. Mass balance calculation of substance treated versus that remaining, N❑ 14. Assumptions, parameters, calculations and model used in risk NIA assessments, and fate and transport modeling; Y� 15. Rationale why conditions remaining at site will not adversely impact water quality, health, or other beneficial uses; and N❑ 18. WET or TCLP results Overexcavation activities removed a large mass of the soil contamination. Mass calculation was not completed. Low conc, soil impact limited to the UST excavation area, highest concentrations encountered between 14 and 21 feet bgs were removed by excavation. BrmP4 Comments: Low concentrations of TPHg and TEX contamination remains in soil in the vicinity of the former USTs. The extent of soil contamination has been determined with 5 soil borings to between 24 and 37 feet bgs. Date:j l 12 l $ Overexcavation activities have removed the high concentrations of contaminated soil between 14 and 21 feet bgs. The remaining contamination is unlikely to pose a threat to water quality. Closure concurrence appears warranted.