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TABLE T - 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 /> 1. Distance to production wells for municipal, domestic, agriculture, No municipal supply wells are located within 2000 feet
<br /> industry and other uses within 2000 feet of the site; of the site. One domestic well is located 1,750 feet
<br /> south (downgradient) of the former USTs.
<br /> Y 2. Site maps, to scale, of area impacted-showing locations of forarner a d existing tank
<br /> systems, excavation contours and sample locations, boring and monit ring well elevation Three 10,000-gallon gasoline
<br /> contours, gradients, and nearby surface waters, buildings,"streets, and subsurface USTs were removed in 7/98.
<br /> utilities,
<br /> 3. Figures depicting lithology(cross section), treatment system diagra s; Site lithology consists of sand,silt, and clay.
<br /> The total depth investigated was 90 feet.
<br /> 0 4. Stockpiled soil disposed off-site(quantity); Approximately 30 tons of excavated soil was disposed offsite at
<br /> Forward Landfill, Wanteca.
<br /> 5. Monitoring wells remaining on-site, fate; Four monitoring wells GMX-1,MW-2 through MW-4)and one extraction well
<br /> (EX-1), installed for th investigation, will be abandoned.
<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 /> Q 7.Tabulated results of all sampling and In 7/98, maximum oil confirmation results were; TPHg(4,400 mg/kg),
<br /> analyses: benzene(0.006 m kg), toluene(24 mg/kg), ethylbenzene(73 mg/kg),
<br /> xylenes(430 mg/k )and MTBE(10 mg/kg). Soil boring results.in 6199 for
<br /> Detection limits for confirmation sampling monitoring well M -2 were TPHg(12 mg/kg), toluene(0.11 mg/kg),
<br /> Lead analyses ethylbenzene(0.5 g/kg), and xylenes(0.49 mg/kg). Maximum
<br /> groundwater monitoring results in 4/99 were: TPHg(35,000 Ng/L),
<br /> benzene(150 pg1L), toluene(2,700 pg/L), ethylbenzene(1,300 erg/L),
<br /> xylenes(8,100 pg1)and MtBE(120lrg/L). In 5105, maximum groundwater
<br /> monitoring results were: TPHg(6,500 pg/L),benzene(0.5 pg1L), toluene
<br /> (90 pg/L), ethylben ene(521 pg/L),and xylenes(1,030 pg/L).
<br /> 8. Concentration contours of contaminants found and those remaining in soil
<br /> and.groundwater, both on-site and off-site: The extent of contamination is defined by
<br /> Y Lateral andNY
<br /> Vertical extent of soil contamination soil borings and monitoring wells.
<br /> ® Lateral and Vertical extent of groundwater contamination
<br /> Y� 9. Zone of influence calculated andfassumptions 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 remediation sstem; treatment, was required at this site.
<br /> ILI 10.Reports/information I_J Unauthorized Release Form 23 WRs(4199 to 5/05)
<br /> Boring logs 0 PAR FRP Othe :Receptor Survey, and Closure Report
<br /> 0 11.Best Available Technology(BAT) used or an explanation for not usr g BAT,. Remove USTs, overexcavation,groundwater
<br /> pump and treatment, and natural _
<br /> -Y attenuation.
<br /> 12.Reasons why background wash's Minor soil and groundw iter contamination remains on-site.
<br /> unattainable using BAT,'
<br /> y 13.Mass balance calculation of substance The consultant estimat s 1.7 gallons of TPHg contamination remain in soil and
<br /> treated versus that remaining. 0.35 gallons of TPHg remain in groundwater.
<br /> N� 14.Assumptions, parameters, calculations and mode!
<br /> A risk assessment was not required by San Joaquin County. The
<br /> used in risk assessments, and fate and transport
<br /> modeling;and Region 2 E Ls(100 mg/kg) were exceeded by the remaining TPHg
<br /> soil concentration.
<br /> 15. Rationale why conditions remaining at site will not Soil contar iination is limited in extent, and based on 23 quarters
<br /> adversely impact water quality, health, or other of groundwater monitoring and pump and treat remediation,
<br /> beneficial uses. petroleum 7ydrocarbon concentrations are declining.
<br /> By: Comments: Three 10,000-gallon gasoline USTs were remove from the subject site in 7198. Groundwater pump and
<br /> YLB treatment removed over 500,000 gallons of water in 2003. In /98, maximum soil confirmation results were: TPHg(4,400
<br /> mg/kg), benzene (0.006 mg/kg), toluene (24 mg/kg), ethylben gne(73 mg/kg), xylenes(430 mg/kg)and WBE(10 mg/kg).
<br /> Date: Soil boring results in 6199 for monitoring well MW-2 were TPH t(12 mg/kg), toluene (0.11 mg/kg), ethylbenzene(0.5 s
<br /> mg/kg), and xylenes(0.49 mg/kg). Maximum groundwater moi 7itoring results in 4199 were: TPHg(35,000 pg1L), benzene
<br /> (150pg1L),-toluene (2,700 pg/L), ethylbenzene(1,300 pg1L),xylenes(8,100 pg1L) and MtBE(120 pg1L). In 5105,
<br /> 8122/OS maximum groundwater monitoring results were: TPHg(6,500pg1L), benzene(0.5 pg/L), toluene(90 pg1L), ethylbenzene
<br /> (521 pg/L), and xylenes(1,030 pg/L). Based on the limited extent of soil contamination and decreasing contaminant
<br /> concentrations in,groundwater, Regional Board staff concur wi h San Joaquin County's Closure Recommendation.
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