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CHECKLIST OF DATA
<br /> FOR NO FURTHER ACTION REQUESTS AT UNDIERGROUN ANK SITES
<br /> Site Name and Location: I Western Olt And Spreading,Inc., 19256 N.Hwy 99,Acempo, San Joaquin County(RB#390212)
<br /> Y1 1. Distance to production wells for municipal,domestic, A September 2003 sensitive receptor survey stated
<br /> agriculture, industry and other uses within 2000 feet of the site. sixty three water supply wells were/dent/fled within
<br /> 2,000'of the Site. The nearest downgrad/ent well is 300'
<br /> of ite to the north. The onsite well(200'upgradlent)
<br /> was mported as ND In Soptemr 3.
<br /> Y 2. Site maps, to scale, of area impacted showing locations of any /n October 987, two 20,000-gall n liquid aspha/4 one
<br /> former and existing tank systems, excavation contours and 2,000-gallon dlesel, one 1,000-gallon gasoline
<br /> and one
<br /> sample locations, boring and monitoring well elevation contours, 500-gallon gasoline USTs were removed.
<br /> gradients, and nearby surface waters,buildings, streets, and
<br /> subsurface utilities;
<br /> Y 3. Figures depicting lithoiogy(cross section), treatment system SHO 100109Y consists of clay,slit and sand to 62, the
<br /> diagrams" total depth Investigated.
<br /> N 14. Stockpiled soil remaining on-site or off-site disposal(quantity); The quantity of excavated soil was not provided/n the
<br /> available reports,but contaminated soil was reportedly
<br /> "cappedly ons/te.
<br /> 5. Monitoring wells remainingsite, fate; I Seven monitoring wells(MW-1 through MW-7)will be properly abandoned.
<br /> a u ae resu s o a roup a '10 6lL' ltow
<br /> elevations and depths to water-,, direction varied from northeast to northwest. Groundwater gradient
<br /> varied from 0.001 to 0.008 ft/ft.
<br /> 7. Tabulated results of all sampling All data adequately tabulartzed/n various reports,Including closure report.
<br /> and analyses:
<br /> aDetection limits for confirmation
<br /> sampling
<br /> �Y Lead analyses
<br /> 8. Concentration contours of contaminants found and those remaining in soil and The extent of the ldentifled
<br /> groundwater, and both on-site and off-site: contamination shown In applicable
<br /> Lateral and El Vertical extent of soil contamination reports.
<br /> Lateral and FY1 Vertical extent of groundwater contamination
<br /> 9. Zone of influence calculated and assumptions used for subsurface remediation An engineered remediation was not
<br /> system and the zone of capture attained for the soil and groundwater remediation required by the regulatory agency.
<br /> s stem;
<br /> 10.Reports/information Y Unauthorized Release Form Y QMRs 33 from 12/00 to 1/10
<br /> QY Well and boring logs EY PAR R FRP 5Other three closure reports(9-03, 3-10, 10-10)
<br /> Y 11,Best Available Technology(BAT) used or an explanation for not To removal and natural attenuation.
<br /> using BAT;
<br /> 12. Reasons why background�s Reportsdty minor residual soil and groundwater contamination(TP"
<br />_ ainable usin BAT,•.____ — -— - remain on= — -- - — -
<br /> 13.Mass balance calculation of substance treated The consultant did not estimate mass removed nor remaining mass/n
<br /> versus that remainin soil and groundwater.
<br /> N 14. Assumptions,parameters, calculations and The regulatory agency did not require a soil vapor survey.Solis falling
<br /> model used In risk assessments, and fate and Region 2 ESLs for gross contamination and direct contact(TPHd)are
<br /> transport modeling, I located below 6'bgs and over 100'from the nearest structure.
<br /> 15. Rationale why conditions remaining at site Soil contamination(heavy hydrocarbons)reportedly is limited/n extent.
<br /> will not adversely impact water quality, health, or Groundwater should reach WQGs/n ten years.Land use(commercial)
<br /> other beneficial uses;and I is not expocted to change In the foreseeable future.
<br /> By: JL Comments:In October 1987,two 20,000-gallon liquid asphalt,one 2,000-gallon diesel, one 1,000-gallon
<br /> gasoline and one 500-9811017 gasoline USTs were removed from the subject Site.Based upon 33 quarters of
<br /> Date: groundwater monitoring showing WQGs should be reached In 2020,the limited extent of contamination
<br /> 12/8/2010 remaining In soil and groundwater,no foreseeable changes/n land use,and limited threats from
<br /> groundwater, soil vapor, and soil,Regional Board staff concur with San Joaquin County's Closure
<br /> Recommendation.
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