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TABLE_'1 - CHECKLIST QF., . EQUIRED DATA
<br /> FOR NO FURTHER ACTION REQUESTS AT UNDERGROUND TANK SITES
<br /> Site Name and Location: Right-Way Incorporated,200 South Cherokee Road, Lodi,San Joaquin County
<br /> 0 1. Distance to production wells for municipal, domestic, agriculture, Based on the limited extent of soil contamination, a
<br /> industry and other uses within 2000 feet of the site; well receptor survey was not required.
<br /> 2. Site maps, to scale, of area impacted showing locations of former a d existing tank systems, One 275-gallon waste oil
<br /> Y
<br /> excavation contours and sample locations, boring and monitoring well elevation contours, UST was removed in
<br /> July 1998.
<br /> gradients, and nearby surface waters, buildings, streets, and subsurfa a utilities;
<br /> T] 3. Figures depicting lithology(cross section), treatment system diagrams; Boring logs show sand and silt with minor clay
<br /> to 41 feet, the total depth investigated.
<br /> N 4. Stockpiled soil disposed off-site(quantity); Excavated soils were returned to the tank pit excavation.
<br /> 5. Monitoring wells remaining on-site, fate;
<br /> Groundwater was not encountered during assessment activities,and
<br /> �� monitoring wells.were.not installed.,��
<br /> 0 6. Tabulated results of all groundwater elevations and depths to wate • Groundwater was not encountered at 41 feet, the
<br /> total depth investigated.
<br /> 7. Tabulated results of all sampling and analyses: TPHd,motor oil and solvents were identiFed in soil at 3 to 7 feet
<br /> during UST removal In July 1998. Results of soil sampling at 11, 16,
<br /> Detection limits for confirmation sampling and 20 feet be/ the former UST are non-detect for all constituents
<br /> 0 Lead analyses including fuel oxygenates at acceptable detection limits.
<br /> 0 Y 8. Concentration contours of contaminants found and those remainin in soil
<br /> and groundwater, and both on-site and off-site: The extent of soil contamination is
<br /> Lateral andF1 Vertical extent of soil contamination confined to the tank pit area. Groundwater
<br /> Lateral and Vertical extent of groundwater contamir ation was not encountered.
<br /> 9.Zone of influence calculated and assumptions used for subsurface Based on the limited soil contamination,
<br /> 0 remediation system and the zone of capture attained for the soil and site remediation was not required.
<br /> groundwater remediation system;
<br /> 0 10.Reports/information El Unauthorized Release Form Q Rs
<br /> El Boring logs ❑ PAR ❑ FRP ❑ Other
<br /> TI 11.Best Available Technology(BAT) used or an explanation for not us r g BAT,- The USTs were removed. The remaining
<br /> contamination will naturally degrade.
<br /> Y� 12.Reasons why background wasfis' Sofi contamination remains in the tank pit area: 'The remaining contaminati6n
<br /> unattainable using BAT,- is limited in extent,and does not present a significant threat to water quality.
<br /> N� 13.Mass balance calculation of substance Based on the limited extent of contamination,a mass balance was not
<br /> treated versus that remaining, required.
<br /> 14.Assumptions, parameters, calculations and model used in risk Based on the limited extent of contamination, a risk
<br /> assessments, and fate and transport modeling; assessment was not required.
<br /> YTI 15. Rationale why conditions remaining at site will not adverselyR maining contamination is limited to the tank pit area.
<br /> impact water quality, health, or other beneficial uses,and P troleum hydrocarbon contamination will naturally
<br /> d grade,and solvent contamination will volatilize and
<br /> d(fuse upward.
<br /> 0 16.WET or TCLP results. A WET test co plated on one soil sample with 4.1 mg/kg of lead was
<br /> non-detect at< .5 mgli.
<br /> By: Comments: The site has operated as an automotive repair shop since early 1980's. One waste oil UST was removed
<br /> MH from the site in July 1998. TPHd, motor oil, metals, and solver is were identified in soil at 3 to 7 feet during tank removal
<br /> activities, and two soil borings were completed to define the e>tent of contamination. Soil samples collected at 11, 16,
<br /> Date: and 20 feet are non-detect for TPHd, motor oil, and solvents, and metal concentrations are within background limits. The
<br /> 112101 depth to water is estimated at 45 feet. The site is covered with concrete, which should limit leaching of contaminants.
<br /> Based on the limited extent of soil contamination, Board staff concur with San Joaquin County's closure recommendation.
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