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-\BLE 1 -CHECKLIST OF REQUIRED DATA
<br /> FOR NO FURI't ACTION REQUESTS AT UNDERGROUN NK SITES"
<br /> Site Name and Location: Gubary Liquor, 1.7717 E. Hwy 120, Ripon, San Joaquin County (Lustis Case 391065)
<br /> Y Distance to production wells for municipal, domestic, A 9999 well survey reported 9 domestic well exists at the
<br /> culture, indusLq and other uses within 2000 feet of the site. site.
<br /> Y 2. Site maps, to scale, of area impacted showing locations of One 6,000-gallon and two 8,000-gallon gasoline USTs and
<br /> any former and existing tank systems, excavation contours associated piping/dispensers were removed 3/99. TPHg,
<br /> and sample locations, boring and monitoring well elevation toluene, ethylbenzene, and xylenes were detected in soil
<br /> contours, gradients, and nearby surface waters, buildings, beneath the USTs. No-new USTs were installed
<br /> streets, and subsurface utilities;
<br /> Y 3. Figures depicting lithology.(cross section), treatment Site lithology consists of silt and sand to 56 feet, the total
<br /> system diagrams; depth investigated.
<br /> Y 4. Stockpiled soil remaining on-site or off-site disposal(quantity)` The fate of the excavated soil is not discussed in the
<br /> report.
<br /> Y 5. Monitoring wells remaining on-site, fate; No monitoring wells were installed at the site.
<br /> 6. Tabulated results of all groundwater Depth to groundwater was approximately 55 feet below ground surface
<br /> elevations and depths to water, (bgs). Groundwater gradient and the downgradient direction were not
<br /> reported.
<br /> YJ 7. Tabulated results of all sampling Maximum confirmation(3199)sample soil concentrations were TPHg, 7 mg/kg,
<br /> v and analyses toluene,0A88 mg/kg;ethylbenzene, 0.062 mg/kg;and xylene_ s,_0.5mg/kg. to
<br /> w 6/08, the USTs area soil boring and the grak groundwater sample results were non-
<br /> Detection limits for confirmation detect.
<br /> i
<br /> sampling
<br /> N❑ Lead analyses I
<br /> 8. Concentration contours of contaminants found and those remaining in soil and The extent of the identified
<br /> groundwater, and both on-site and off-site:, contamination shown in applicable
<br /> reports.
<br /> E Lateral and Y❑Vertical extent of soil contamination
<br /> Lateral and FYI Vertical extent of groundwater contamination
<br /> 9. Zone of influence calculated and assumptions used for subsurface remediation An engineered remediation was not
<br /> system and the zone of capture attained for the soil and groundwater remediation required by the regulatory agency
<br /> system;
<br /> i
<br /> 10.Reports/information ❑Y Unauthorized Release Fora FN QMRs
<br /> Boring logs PAf FRPH OtheH
<br /> Y 11.Best Available Technology(BAT) used or an explanation for not using BAT Removal of USTs,and natural attenuation.
<br /> Y 12. Reasons why background wads unattainable Limited soil contamination remains on-site.
<br /> BAT;
<br /> y 13.Mass balance calculation of substance treated The consultant did not estimate the amount of residual contamination
<br /> versus that remainin in soil or groundwater.
<br /> Y 14. Assumptions, parameters, calculations and No soil ESLs were exceeded. Soil vapor intrusion was evaluated;and
<br /> -modeltused-in-risk-assessments;-end-fate-and--- —--no-threat-was-indicated-due to-
<br /> the—distance—(30—fee—t)—from—former—USTs—transport modeling, to store and low soil concentrations.
<br /> Y 15. Rationale why conditions remaining at site will Soil contamination is limited in extent. Groundwater is not impacted i
<br /> not adversely impact water quality, health, or other by the release..
<br /> beneficial uses;and
<br /> By: JLB Comments:One 6,000-gallon and two 8,000-gallon gasoline USTs and associated piping/dispensers were
<br /> removed 3199 at the subject site.. TPHg, toluene, ethylbenzene, and xylenes were detected in soil beneath the
<br /> Date: USTs. No new USTs were installed. Maximum confirmation (3199)sample soil concentrations were TPHg,
<br /> 8/15/2008 7 mg/kg, toluene,0.088 mg/kg;ethylbenzene; 0.062 mglkg;and xylenes, 0.569 mg/kg. In 6108, the USTs area
<br /> soil boring and the grab groundwater sample results were non-detect. Based upon the limited extent of
<br /> contamination present in soil, Regional Board staff concur with San Joaquin County's Closure
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