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TABLE 1 - CHECKLIST OF REQUIRED DATA
<br /> FOR NO FURTHER ACTION REQUESTS AT UNDERGROUND TANK SITES
<br /> Site Name and Location: Sunwest Liquors, 2449 W. Kettleman Lane Lodi,San Joaquin County
<br /> o municipal supply-wells are located within 2006 feet
<br /> ❑
<br /> Y 1. Distance to production wells for municipal, domestic, agriculture,
<br /> industry and other uses within 2000 fest of the site; f the site. One domestic well is located 1,750 feet
<br /> outh(downgradient)of the former USTs.
<br /> 0 2. Site maps, to scale, of area impacted showing locations of former a d existing tank
<br /> Three 10,000-gallon gasoline
<br /> systems, excavatiomcontours and sample locations, boring and morii ring well elevation USTs were removed In 7198.
<br /> contours, gradients, and nearby surface waters, buildings, streets,and subsurface.
<br /> utilities;
<br /> ❑Y 3. Figures depicting lithology(cross section), treatment system diagrams, Site lithology consists of sand,slit,and clay.
<br /> The total depth investigated was 90 feet
<br /> ❑Y
<br /> 4. Stockpiled soil disposed off-site (quantity); Approximately 3 tons of excavated soil was disposed offsite at
<br /> Forward.Landfll/, Manteca.
<br /> ❑ 5. Monitoring wells remaining on-site, fate; Four monitoring wells(GMX-9,MW-2 through MW-4)and one extraction well
<br /> (PX--1),Installed for thIs lnvestlgatlon, will be abandoned.
<br /> ❑Y
<br /> 6. Tabulated results of all groundwater elevations and depths to Ovate, The depth to water varied from 41 to 55 feet
<br /> Groundwater flow direction varied from southeast
<br /> to southwest.
<br /> ❑ 7.Tabulated results of all sampling and In 7/98,maximum soll confirmation results were: TPHg(4,400 mg/kg),
<br /> analyses: benzene(0.006,mi kg),toluene(24 mg/kg), ethylbenzene(73 mg/kg),
<br /> Y Detection!!mils for confirmation sampling xylenes(430 mg/ and MtBE( 10 mg/kg). Sol/boring results in 6199 for
<br /> monitoring well M -2 were TPHg(12 mg/kg), toluene(0.11 mg/kg),
<br /> 5 mg/
<br /> Lead analyses ethylbenzene(0. kg),and xylenes(0.49 mg/kg). Maxlmum
<br /> groundwater mon toning results In 4199 were: TPHg(35,000 pg1L),
<br /> benzene(150 pg/ ,toluene(2,700 pg/L), ethylbenzenet(1,300 pg1L),
<br /> xylenes(8,100 p L)and MISS(120 pg1L). In:5105,maximum groundwater
<br /> monitoring resin were:TPHg(6,500 pg/L),benzene(0.5 pg1L), toluene
<br /> (90 pg/L), ethylbe izene(521 pg(L),and xylenes(1,030 pg/L).
<br /> 0 8. Concentration contours of contaminants found and those nsmainin 7 in soil
<br /> and groundwater, both on-site and off-site: The extent of contamination/s defined by
<br /> ®Y Lateral and Y vertical extent of soil contamination sof!borings and monitoring wells.
<br /> Lateral and M Vertical extent of groundwater contem nation
<br /> ❑ 9. Zone of influence calculated and assumptions used for subsurface An engineered remediation system,
<br /> remediation system and the zone of capture attained for the soil and consisting of groundwater pump and
<br /> groundwater remedlation em; treatment, was required at this site.
<br /> 0 10.Reports l information LY Unauthorized Release Form 2 QMRs(4/99 to 5105)
<br /> El Boring logs PAR a. FRF' a Other Receptor Survey, and Closure Report
<br /> 11.Best Available Technology(BAT) used or an explanation fornot using BAT; Remove USTs, overexcavation,groundwater
<br /> pump and treatment,and natural
<br /> attenuation.
<br /> 12.Reasons why background wasrs Minor soll and ground ovater contamination remains on-site.
<br /> unattainable using BAT;
<br /> LEI13.Mass balance calculation of substance The consultant estlma es 1.7 gallons of TPHg contamination remain in soil and
<br /> treated versus that remaining; 0.33 gallons of TPHg main In groundwater.
<br /> FN_1 14. Assumptions, parameters, calculations and model
<br /> used In risk assessments, and fate and transport A risk as essment was not required by San Joaquin County. The
<br /> modeling;and Region 2 SL*(100 mg/kg) were exceeded by the remaining TPHg
<br /> soli conc ntratlon.
<br /> 15. Rationale why conditions remaining at site will not Soil con urination Is limited in extent, and based on 23 quarters
<br /> adversely impact water quality, health, or other of groun ter monitoring and pump and treat remedlation,
<br /> beneficial uses. petroleu hydrocarbon concentrations are declining.
<br /> By: Comments: Three 10,000-gallon gasoline USTs were neuro ed from the subject site in 7/98. Groundwater pump and
<br /> JL,g treatment removed over 500,000 gallons of water in 2003. ! 7/98, maximum soil confirmation results were:TPHg(4,400
<br /> mg/kg), benzene(0.006 mglkg), toluene(24 mg/kg), ethylbe zone(73 mglkg), xylenes(430 mglkg)and WBE(10 mglkg).
<br /> Date: Sol/boring results In 6199 for monitoring well MW-2 were TP g(12 mg/kg), toluene(0.11 mg/kg), ethylbenzene(0.5
<br /> mglkg), and xylenes(0.49 mg/kg). Maximum Waundwater onitoring results In 4199 were: TPHg(35,000 yg1L), benzene
<br /> 8122105 (150 pg/L), toluene(2,700 pg1L), ethylbenzene(1,300pg/L), ylenes(8,100 pg/L)and Mt9E(120ug/L). !n 5/05,
<br /> maximum groundwater monitoring results were:TPHg(6, pg&), benzene(0.5 pgA.), toluene(90 pg1L), ethylbenzene
<br /> (521 pgk), and xylenes(1,030 pg&). Based on the limited a tent of soft contamination and decreasing contaminant
<br /> concentrations in groundwater, Re lona!Board staff concur th San Joaquin County's Closure Recommendation.
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