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TA 1 - CHECKLIST OF REQUIREATA <br /> FOR NO FURTHER ACTION REQUESTS AT UNDERGROUND TANK SITES <br /> ,e and Location: Rossetti's Market,25411 Lone Tree Road, Escalon, San Joaquin County <br /> ,. Distance to production wells for municipal, domestic, agriculture, industry There is no evidence of groundwater <br /> and other uses within 2000 feet of the site; contamination,and SJCEHD did notbelieve a well survey warranted. <br /> ,r 2. Site maps, to scale, of area impacted showing locations of former and existing tank systems, 3 UST excavations,5 soil <br /> excavation contours and sample locations, boring and monitoring well elevation contours, borings advanced in the <br /> �- gradients, and nearby surface waters, buildings, streets, and subsurface utilities; area excavation. <br /> of the <br /> impacted UST <br /> on. <br /> 3. Figures depicting lithology(cross section), treatment system diagrams; Borings logs:Sand to14'and silt to 35; <br /> site covered by asphalt. <br /> N <br /> 4. Stockpiled soil remaining on-site or off-site disposal(quantity); NIA <br /> 5. Monitoring wells remaining on-site, fate; Groundwater was not encountered to 35 feet bgs in soil borings. No <br /> monitoring wells were installed. <br /> ❑ 6. Tabulated results of all groundwater elevations and depths to water; NIA <br /> N <br /> y� 7. Tabulated results of all sampling and analyses: Initial soil sample results from UST excavation at time of tank pull: <br /> 2040 ppm TPHg, benzene 0.073 ppm. Sampling during soil boring <br /> ❑y Detection limits for confirmation sampling program: 4.8 ppm TPHg, benzene 0.017 ppm, All oxygenates were ND <br /> FNI Lead analyses by EPA Method 8260. <br /> FN--] 8. Concentration contours of contaminants found and those remaining in soil The lateral and vertical extent of soil <br /> AW groundwater, and bot"-site and off-site: contamination has been determined. The <br /> I Lateral and u Vertical extent of soil contamination only soil impact is near the former UST <br /> excavation. No groundwater contamination <br /> FNJ Lateral and FNJ Vertical extent of groundwater contamination has been observed. <br /> FN-1 9.Zone of influence calculated and assumptions used for subsurface NIA <br /> remediation system and the zone of capture attained for the soil and <br /> groundwater remediation system; <br /> 0 10.Reports/informationy❑Unauthorized Release Form N]QMRs(Dates) <br /> Fy Well and boring logs ❑N PAR ❑N FRP Ry Other(report name)Summary Rpt of Subsurface Invest. <br /> N❑ 11.Best Available Technology(BAT)used or an explanation for not using BAT, wA <br /> I n t 12.Reasons why background wads unattainable using BAT; Nie <br /> EN 1 13.Mass balance calculation of substance treated versus that remaining; Mass calculation was not completed. <br /> N❑ 14.Assumptions,parameters, calculations and model used in risk NIA <br /> assessments, and fate and transport modeling; <br /> Y� 15.Rationale why conditions remaining at site will not adversely Low cone. soil impact limited to within 10-15 feet of the <br /> impact water quality, health, or other beneficial uses;and UST excavation, highest concentrations encountered <br /> between 10 and 15 feet bgs. <br /> N1 16.WET or TCLP results <br /> By: Comments:Low concentrations of TPHg and BTEX, were present in soil samples collected from the UST excavation <br /> in 1987. The 1998 soil investigation detected low cone of TPHg and BTEX, in two soil borings loc. next to the UST <br /> ` Date: ;; excavation. Groundwater was not encountered in the soil boring to 35'bgs, and no evidence of a potential <br /> ,f groundwater impact is evident. This site poses little threat to water quality, and closure concurrence appears <br />