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LE 1 -CHECKLIST OF REQUIRED DATA
<br /> FOR NO FURTHER ACTION REQUESTS AT UNDERGROUND TANK SITES
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<br /> Site Name and Location: Ace Tomato Company Inc.,2771 E.French Camp Rd.,Manteca,San Joaquin County(Lustis Case 391156)
<br /> Y1 1. Distance to production wells for municipal, domestic, A 2007 well survey showed four onsite(domestic,
<br /> agriculture, industry and other uses within 2000 feet of the site. industrial, and agricultural)wells exist within 500 feet of
<br /> the USTs. All wells were tested and reported as ND.
<br /> Yr 2. Site maps, to scale, of area impacted showing locations of One 6,000-gallon gasoline and one 6,000-gallon diesel
<br /> any former and existing tank systems, excavation contours and . tanks installed in 1989 are iactive at the site. During
<br /> sample locations, boring and mordtoring well elevation upgrades in Jan 2004, the gasoline and diesel dispensers
<br /> contours, gradients, and nearby surface waters, buildings, and associated piping were discovered leaking and
<br /> streets, and subsurface utilities; removed. Subsequently soil was overexcavated below
<br /> the dis ensers.
<br /> Y1 3. Figures depicting Iithology(cross section), treatment system Site lithology consists of clay, silt and sand to
<br /> diagrams; 36 feet, the total depth investigated.
<br /> Y 4. Stockpiled soil remaining on-site or off-site disposal(quantity); Approximately 5.54 tons'of over-excavated soil was
<br /> removed and transported to Forward Landfill 4/04
<br /> y 5. Monitoring wells remaining on-site, fate; No monitoring wells were required or installed for this investigation.
<br /> _ _.. Yj 6. Tabulated results of all groundwateri. Depth togroundweter was approximately
<br /> 11 feet below ground surface
<br /> elevation—sandVepfhst6-water,• " nom e re aiground -fow direction_is.towards-the
<br /> . J.
<br /> 7. Tabulated results of all sampling In 1/04, the maximum soil confirmation samples were benzene, 0.089 mg/kg;
<br /> and analyses: toluene; 1.88 mg/kg;ethylbenzene, 0.671 mg/kg;xylenes;3.86 mg/kg;MtBE,
<br /> 2.1 mg/kg;and TBA, 14.5 mg/kg. Maximum soil borings concentration in 10/04 was
<br /> Y❑ Detection limits for confirmation TPHd, 1.1 mg/kg. Maximum grab groundwater concentrations in 10/04 were TPHg,
<br /> sampling 270 ug/L; TPHd, 79 ug/L;and ethanol, 43 ug/L. No additional groundwater sample --
<br /> results were reported after 10/04.
<br /> Lead analyses .... ...
<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: contaminatlon is shown in applicable
<br /> reports.
<br /> Y❑Lateral and FA Vertical extent of soil contamination
<br /> Lateral and FNJ 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 lead agency.
<br /> system;
<br /> Yj 10.Reports/information MY Unauthorized Release Form. 0 QMRs
<br /> 0
<br /> Welland g borin logs 0 PAR 0 FRP ❑y Other;Closure Report, 7107 _ ...._
<br /> Y 11.Best Available Technology(BAT)used or an explanation for not using Removal of dispensers and piping,
<br /> BAT, I overexcavation and natural attenuation.
<br /> 12. Reasons why background wasrs unattainable Limited soil contamination and groundwater pollution remain on-site.
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<br /> BA T,-
<br /> y 13.Mass balance calculation of substance treated in-7107,=the-r"lduai contaminatton-was-estimated in-soil-as T-PHg, -
<br /> versus that remaining; 0.59 lbs;benzene, 0.0025 lbs.;and MtBE, 1.41 lbs.
<br /> Y 14. Assumptions, parameters, calculations and No Region 2 soil gas ESLs were exceeded during the soil gas
<br /> model used in risk assessments, and fate and investigation. ?f '
<br /> transport modeling;
<br /> Y 15, Rationale why conditions remaining at site will Soil and groundwater contamination is limited in extent. .
<br /> not adversely impact water quality, health, 'or other
<br /> beneficial uses;and
<br /> By: JLB Comments: One 6,000-gallon gasoline and one 6,000-gallon diesel tanks installed in 1989 are active at the subject
<br /> site. During upgrades in Jan 2004, the gasoline and diesel dispensers and associated piping were discovered
<br /> Date: leaking and removed. Subsequently 5.54 tons of soil was overexcavated below the dispensers. Samples from tbur...-
<br /> 3/25/2008 supply wells were ND. In 1/04, the maximum soil confimmation.samples were benzene, 0.089 mg/kg;toluene;
<br /> 1.88 mg/kg;ethylbenzene, 0.671 mg/kg;xylenes, 3.86 mg/kg;MtBE, 2.1 mg/kg;and TBA, 14:5 mg/kg. Maximum . .
<br /> soil borings concentration in 10/04 was TPHd, 1.1 mg/kg. Maximum grab groundwater concentrations in 10/04 were
<br /> TPHg, 270 ug/L(reported as dodecane, 56 ug/L and chloroform, 260 pg/L); TPHd,;79 ug/L;and ethanol, 43 ug/L. No
<br /> additional groundwater sample results were reported after 10/04.'Based upon the limited extent of contamination
<br /> present in soil and groundwater and the lack of a threat from soil vapor intrusion at the canning factory, Regional
<br /> Board staff concur with San Joaauin,Countv's Closure Recommendation.
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