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CHECKLIST OF REQUIRED DATA
<br /> FOR NO FURTHER ACTION REQUESTS AT UNDERGROUND TANK SITES
<br /> Site Name and Location: A. Teichert& Company, 103 N. E Street, Stockton, San,Joaquin County(RB#1390589)
<br /> Y 1. Distance to production wells for municipal, domestic, A 1996 sensitive receptor survey stated one water supply
<br /> agriculture, industry and other uses within 2004 feet of the site.
<br /> well is located 1,200'northeast of the site.
<br /> Y 2. Site maps, to scale, of area impacted showing locations of Between 9986 and 2000, two 5,000-gallon and two 20,000-
<br /> any foruier and existing tank systems, excavation contours and gallon diesel,.one 12,000-gallon, one 1,000-gallon and
<br /> sample locations, boring and monitoring well elevation one 550-gailon gasoline;and one 1,000-gallon and one
<br /> contours, gradients, and nearby surface wafers, buildings, 2,000 gallon waste oil USTs were removed(total of 10
<br /> streets, and subsurface utilities; USTs).
<br /> Site lithology consists of clay,silt,and sand to 120', the
<br /> Y 3. Figures depicting lithology(cross section), treatment system total depth investigated.
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<br /> diagrams;
<br /> - Approximately 2400 cubic yards of soll was treated
<br /> Y 4. Stockpiled soil remaining on-site or off-site disposal(quantity); onsite and at a Teichert facility in Tracy,and reused.
<br /> Y 5. Monitoring wells remaining on-site, fate; Seven monitoring wells(MW-1, MW-13 through MW-18), one soil vapor(VW),
<br /> and one airs are A5-1 will be. ro er! abandoned.
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<br /> epth to groundwater varied from 36'to 80'bgs. Groundwater flow
<br /> 6. Tabulated results of all gr_oundwate� r �_ recfion-varied-from-northeast=to-south eas"roundwater-gradient elevations and depths to"wafer, aried from 0.001 to 0.007 ft/ft.
<br /> LYJ 7. Tabulated results of all sampling All data adequately tabularized in various reports, including closure report.
<br /> and analyses:
<br /> Y❑ Defection limits for confirmation
<br /> sampling
<br /> 0 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: contamination shown in applicable
<br /> reports.
<br /> Lateral and Vertical extent of soil contamination
<br /> Lateral and Vertical extent of groundwater contamination
<br /> 9. Zone of influence calculated and assumptions used for subsurface remediation Over-excavation, air sparging,soil vapor
<br /> system and the zone of capture attained for the soil and groundwater remediation extraction, and bioventing were the
<br /> system; . a roved remediation.
<br /> 10.Reports/information �Y Unauthorized Release Form QMRs Approximately 75 from 4/86 to 4/09
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<br /> ❑y Well and boring logsY PAR FRP Other SCM&SIR(4106),Adder. SCM&Env. Case Closure
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<br /> Request(9/09);
<br /> �Yj 11.Best Available Technology(BAT) used or an explanation for not UST removal, over-excavation,-ex-situ soil treatment,
<br /> SVE/A51bioventing and natural attenuation
<br /> UY 12, reasons why background waslis Minor residual soil and groundwater contamination remains on-site.
<br /> ttainable using BAT;
<br /> Y 13.Mass balance calculation of substance treated The consultant estimates approximately 13,400 lbs of TPHg were
<br /> versus that remaining; removed by soil remediation, and 50 lbs of TPHg remains in
<br /> roundwater. .
<br /> Y 14. Assumptions,parameters, calculations and The SVE soil vapor sample results were ND at shutdown,one 1999 soil
<br /> model used in risk assessments, and fate and sample reported maximum TPHg, 9.4 mglkg at 49' bgs.The remaining
<br /> transport modeling, site structure is abandoned.The consultant estimated time for
<br /> i roundwater to reach WQGs: TPHg, 5 years and 1,2-DCA, 13 years..
<br /> Y 15. Rationale why conditions remaining ofsite Soil and groundwater contamination reportedly are limited in extent.
<br /> will not adversely impact water quality, health, or1-future.
<br /> Land use(commercial)isnot expected to change in the foreseeable
<br /> other beneficial uses;and
<br /> t By: JLC Comments:Between 1986 and 2000, two 5,000-gallon and two 20,000-gallon diesel;one 12,000-gallon, one
<br /> 1,000-gallon, and one 550-gallon gasoline;and one 1,000-gallon and one 2,000-gallon waste oil USTs were
<br /> Date: removed(total of 10 USTs)from the subject site.Approximately 2400 cubic yards of sail was treated onsite
<br /> 11/23/2009 and at a Teichert facility in Tracy, and reused. Based upon approximately 75 quarters of groundwater
<br />{ monitoring showing a stable plume with declining concentrations, the limited extent of contamination -
<br /> remaining in soil and groundwater,no foreseeable changes in land use and no soil vapor detected in the
<br /> US Ts area, Regional Board staff concur with San Joaquin County's Closure Recommendation.
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