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TABL - CHECKLIST OF REQUIRED DATA
<br /> FOR NO FURTHER ACTION REQUESTS AT UNDERGROUND TANK SITES
<br /> Site Name and Location:: Martini Automotive, 4032 North EI Dorado Street, Stockton, San Joaquin County {�
<br /> Y I. Distance to production wells for municipal, domestic, agriculture, 3 agricultural wells and 3 drinking water wells were ;
<br /> industry and other uses within 2000 feet of the site; identif<ed. The three nearest wells are about 1000 ft
<br /> from the site. Nearest surface water is 1.5 miles.
<br /> 0 2. Site maps, to scale, of area impacted showing locations of former and existing tank A waste oil UST was removed in y
<br /> systems, excavation contours and sample locations, boring and 1998. Before, 3 former ARCO gas
<br /> and nearby surface waters, buildings, streets, and subsurface utilities; USTs were removed in 1974 at
<br /> the site. Maps are provided.
<br /> �Y 3. Figures depicting lithology(cross section), tri9a tivent system diagFaFn Soils at the site consist of silty/clays and
<br /> silty sands/sands.
<br /> 4. Stockpiled soil remaining on-site or off-site disposal Excavated soil and boring cuttings were placed back into
<br /> (quantity); UST excavation. Decided to leave the dirt in the pit because
<br /> of problems and high cost associated with the landfill.
<br /> 0N 5. Monitoring wells remaining on-site, fate;
<br /> : Monitoring wells were never installed at the site.:
<br /> I
<br /> Q6. Tabulated results of all groundwater elevations and Groundwater samples were collected at approximately 50 feet I1
<br /> �rdepths.to.water, - - bgs. GW flow was assumed to be to the east according to the
<br /> consultant and" according-to t�Corinty
<br /> 7. Tabulated results of all sampling and analyses: ' Max soil results in mg/kg show TPHg at 250, TPHg at 3500, Benz at 0.14,
<br /> FY y Toluene at 0.81, E-benz at 1.4,xylenes at 10, TPH,,,,,at 3100, PCE at
<br /> ;i
<br /> FDefection limits for confirmation sampling 0.25, TCE at 0.019, PCB at 3.5. Lead at 110 mg/kg in the soil when the
<br /> FY]Lead analyses tank was removed. Lead was not tested for in the soil borings
<br /> investigation. No WET test conducted.
<br /> Y� 8. Concentration contours of contaminants found and those
<br /> aining in soil and grow ater, and both on-site and off-site: Four borings were completed at the former waste oil
<br /> N Lateral and Y Vertical extent of soil contamination tank. The lateral extent of the soil contamination was
<br /> Y Lateral and Vertical extent of GW contamination not defined east of the former UST.
<br /> Eli 9.Zone of influence calculated and assumptions used for
<br /> subsurface remediation system and the zone of capture attained A remediation system was not operated at this site.
<br /> for the soil and groundwater remediation system,
<br /> r7Y 40.Reports/information M Unauthorized Release Form QMRs(Dates)
<br /> ❑Y 14telfand boring logs E PAR a FRP M Other(20 July 2000 PiER)
<br /> Y .11.Best Available Technology(BAT)used or an explanation for not using BAT,- Removed UST, natural attenuation
<br /> 0
<br /> Y� ,1.2.Reasons why background waslis unattainable using BAT, TPHmo, TPHd,and PCE constituents remain in on-site I
<br /> soils and groundwater.
<br /> --
<br /> 03 lsass balance, calculation.of substance AARroximately_10.9_gals,-(35.2 kg)of motor�if and
<br /> - - remain in the soil. 29 cu. ds. of sof!are im acted.
<br /> remaining; Y p
<br /> i
<br /> NA 14.Assumptions,parameters, calculations and model used in a
<br /> nsk assessments, and fate and transport modeling;
<br /> Y� 15.Rationale why conditions remaining at site will not adversely The residual contamination remaining in soil& gw does
<br /> impact water quality, health, or other beneficial uses;and not threaten water quality because of its limited mobility
<br /> due to low hydrocarbons and solvent mass remaining.
<br /> By: Comments: JN 1998, one 100gai. waste oil(w/o) UST was removed. A vent line was also removed and backfilled with
<br /> grout. Soil samples collected from soil stockpile and 3 ft. under the end of the UST(about 7 ft. bgs) showed TPHg& TPHd
<br /> C ' up to 250 and 3500 mg/kg. TCE&PCE were detected at 19&220 ug/kg&PCB at 3500 ug/kg. On 16 March 2000, 5
<br /> borings were advanced. One boring was placed between two of the three former ARCO gasoline USTs. One boring
<br /> advanced beneath the former w/o UST and the other 3 surrounding the waste oil tank. TPHd, TPHmo, &PCE were only
<br /> i' detected in the boring directly beneath the former w/o tank at 5& 10 ft. at levels up to 420, 3100, &0.250 mg/kg. PCB was
<br /> i' below detection limit(<630pg/kg). TPHd, TPHmo, and PCE were non-detect at 20 ff.bgs in the soil. The detection limit for
<br /> Date: PCB dropped to <50pg/kg. Two grab groundwater samples were collected. One sample under the former gasoline USTs
<br /> and one under the former w/o UST. No constituents were detected under the former gasoline tanks: TPHd and PCE were
<br /> 9/12/00 detected at 56 and 1.6 ug/L under the w/o tank. PCBs were not detected(<0.5 pg/L). The site is currently paved over with
<br /> asphalt, which should limit further leaching and transport of contaminants. This site should be reviewed if land use
<br /> changes. The site is not part of the redevelopment area.
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