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ABLE I -CHECKLIST OF REQUIRED DATA '
<br /> FOR NO FURTHER ACTION REQUESTS AT UNDERGROUND TANK SITES
<br /> Site Name and Location: Chase Chevrolet(Area 15), 423 Madison 5t.'Stockton, San Joaquin County(RB#390110)
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<br /> I. Distance to production wells for municipal,domestic, A 2012 sensitive receptor survey reported no water
<br /> agriculture, indust and other uses within 2000 feet of the site, supply wells within 2,000'of the Site.'
<br /> Y 2. Site maps, to scale, of area impacted showing In 5-86, one 1,000-gallon gasoline, one 2,000-gallon gasoline, one
<br /> locations of any former and existing tank systems, 5000-gallon gasoline, one 2,000-gallon waste oil,and one 5,000-
<br /> excavation contours and sample locations, boring gallon waste oil USTs were removed. In 11192, one 250-gallon waste
<br /> and monitoring well elevation contours, gradients, oil, one 1,000-gallon waste oil,and one 1,000-gallon diesel/solvent
<br /> and nearby surface waters, buildings, streets, and USTs were removed:In 4-04, one 900-gallon unknown use UST was
<br /> subsurface utilities, discovered and removed during over-excavation.
<br /> Y 3. Figures depicting lithology(cross section), Site lithology consists of clay,silt,and sand to.60', the total depth
<br /> treatment s stem diagrams,- investigated.
<br /> Y 4. Stockpiled soil remaining on- Approximately 3,784 tons of excavated sail was transported to Chemical Waste
<br /> site or off-site disposal (quantity); Management in Kettleman and Altamont Landfill in Livermore.
<br /> Y 5. Monitoring wells Two remediation wells were properly destroyed in October,2001.All monitoring and
<br /> remainin on-site, fate; remaining remedlation wells were properly destroyed during redevelopment in March 2004.
<br /> 6. Tabulated results of all Depth to groundwater varied from 12'bgs to 29'bgs. Groundwater flow direction
<br /> --gmundwater..elevations and depths,to.�. varied from northwest to northeast Groundwater gradient varied from 0.001 fJft to
<br /> water,. 0.009 ft/ft. ___, _- _T - -
<br /> 7. Tabulated results of all sampling All data adequately tabularized in various reports.
<br /> and analyses: {
<br /> Y❑ Detection limits for confirmation
<br /> sampling
<br /> ❑Y Lead analyses
<br /> S. Concentration contours of contaminants found and those remaining in The extent of the identified contamination is.
<br /> soil and groundwater, and both ort-site and off-site: described in the available reports.
<br /> 10 Lateral and ElVertical extent of soil contamination
<br /> Lateral and nY Vertical extent of groundwater contamination ,
<br /> 9. Zone of influence calculated and assumptions used for subsurface Free product(FP)removal, air sparging(AS),
<br /> remediation system and the zone of capture attained for the soil and and soil over-excavation were the engineered
<br /> groundwater remediation system; remediation.
<br /> 10.Reports/information Unauthorized Release Form FYIQMRS (21)8-97 to 8-03
<br /> QY Welland boring logs PAR FRP Other Remediation Completion Report,8/05
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<br /> Y 11.Best Available Technology(BAT) used or an explanation USTs removal, FP;AS, soil'over-excavation,and natural
<br /> for not using BAT; attenuation:
<br /> -Y 412. Reasons why background was<s unattainable Residual soil and groundwater contamination remains.
<br /> BAT; .. _. -
<br /> N 13.Mass balance calculation of substance treated Consultants did not.estimate initial mass or mass removed. C
<br /> versus that remainin ;
<br /> 714. Assumptions, parameters, calculations and A soil vapor survey was not required by the regulatory agency. Soil
<br /> Y model used in risk assessments, and fate and was over-excavated to`17'bgs, which is below typical worker exposure
<br /> transport modeling; depths. Site has been redeveloped as a sports complex. Consultant
<br /> states site does not represent a significant risk: i
<br /> Y 15. Rationale why conditions remaining at site will Soil and groundwater contamination reportedly are limited in extent.
<br /> not adversely impact water quality, health, or other Land use(commercial)is not expected to change"in the foreseeable
<br /> beneficial uses;and future. Based on data trend line analysis, WQGs were reached in 2009.
<br /> By: JLB Comments:In 5-86, one 1,000-gallon gasoline, one 2,000-gallon gasoline, one 5000-gallon gasoline, one
<br /> 2,000-gallon waste oil, and one 5,000-gallon waste oil USTs were removed. In 11192, one 250-gallon waste oil,
<br /> Date: one 1,000-gallon waste oil, and one 1,000-gallon dieselisolvent USTs were removed. In 4-04, one 900-gallon
<br /> 1/3/2013 unknown use UST was discovered and removed during over-excavation at the subject site.Residual soil
<br /> contamination remains. Based upon the limited extent of contamination reported in soil and groundwater,
<br /> groundwater estimated to have reached WQGs, no foreseeable changes in future land use(commercial),and i
<br /> minimal risks from groundwater,soil vapor and soil, Regional Board staff concur with San Joaquin County's �i
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