|
� I
<br /> r
<br /> �rABLE 1 -CHECKLIST OF REQUIRED DATA
<br /> FOR NO FURTHER ACTION REQUESTS AT UNDERGROUND TANK SITES
<br /> Site Name and Location: California Fuels Cardlock Station, 2402 Pacific Ave., Stockton, San Joaquin County(RB#390656)
<br /> A 1997 sensitive receptor survey reported three water
<br /> Y 1. Distance to production wells for municipal, domestic, supply wells(650'northeast, 1,000'northeast and 1,350'
<br /> agriculture, industry and other uses within 2000 feet of the southeast)within 2,000'of the Site. The wells-are not
<br /> site. threatened b this release.
<br /> Y 2. Site maps, to scale, of area impacted showing locations of any former In 3-96, two 10000-gallon gasoline and one
<br /> and existing tank systems, excavation contours and sample locations, 10,000-gallon gasoline/diesel USTs were
<br /> boring and monitoring well elevation contours, gradients, and nearby removed.
<br /> surface waters, buildings, streets, and subsurface utilities; Site lithology consists of clay, silt, and sand to
<br /> Y 3. Figures depicting lithology(cross section), treatment system diagrams; 150', the total depth investigated.
<br /> N 4. Stockpiled soil remaining on-site or off-site disposal The fate of excavated soil was not discussed in the available
<br /> reports.
<br /> uantit ;
<br /> Y 5. Monitoring wells remaining on-site, fate; Fifteen(45)monitoring wells(MW-1 through MW-12, MW-13 A through MW-
<br /> 13C)and seventeen(17)remediation wells(AW-1A, AW-1B,AW-2A,AW2B,
<br /> AW-3 through AW-7, EW-1,and VW-1 through VW-7)will be properly
<br /> destroyed.
<br /> 6. Tabulated results of all groundwater Depth to groundwater varied from 22'bgs to 36'bgs. Groundwater flow direction
<br /> ='e
<br /> ievations-a
<br /> nd de thsto water, = varieth
<br /> varied Ad east to noreast at a gradient of 0.001 ft/_ft to 0,005 ft/ft.
<br /> Tabulated results of all sampling yJ 7. Tab p All data adequately tabularized in various reports,including closure report.
<br /> and analyses:
<br /> FYI Detection limits for confirmation
<br /> sampling
<br /> �N Lead analyses
<br /> 8. Concentration contours of contaminants found and those remaining in The extent of the identified contamination is
<br /> soil and groundwater, and both on-site and off-site: described in the available reports.
<br /> 0 Lateral and ElVertical extent of soil contamination
<br /> Lateral and F1 Vertical extent of groundwater contamination
<br /> 9. Zone of influence calculated and assumptions used for subsurface Soil vapor extraction(S VE)and air sparging,
<br /> remediation system and the zone of capture attained for the soil and (AS)were the engineered remediation.
<br /> groundwater remediation system;
<br /> 10.Reports/information ❑Y Unauthorized Release Form 10 QMRs(52)8-96 to 6-11
<br /> ❑y Well and boring logs �Y PAR ❑I FRP ❑Y Other SVl& Confirmation Borings Report(10-10),
<br /> Closure Re ort 10-11
<br /> YJ 11.Best Available Technology(BAT) used or an explanation US Ts removal, SVEJAS, and natural attenuation.
<br /> for not using BAT;
<br /> yJ 12. Reasons why background was/is unattainable Residual soil and groundwater contamination remains on-site.
<br /> mwng BAT;
<br /> Y- "13. ass ba ance calc—u7a7ion of subs�ce�reated -Consultant-estimated TP-H-masc_removed-as-f3,582-1bsYin-soil.
<br /> versus that remaining, Approximately 329 lbs TPH remain in soil(based on initial mass
<br /> estimate of 13,911 lbs TPH)and S lbs TPH remain in groundwater.
<br /> Y 14. Assumptions, parameters, calculations and Soil vapor passed Region 2 ESL. Confirmation borings did not
<br /> model used in risk assessments, and fate and- detect soil contamination. Consultant states site does not represent
<br /> transport modeling, a significant risk.
<br /> Y 15. Rationale why conditions remaining at site will Soil and groundwater contamination reportedly are limited in
<br /> not adversely impact water quality, health, or other extent. Groundwater plume is stable and decreasing. Land use
<br /> beneficial uses;and (commercial)is not expected to change in the foreseeable future.
<br /> TPH in groundwater is estimated to reach WQGs in 2016.
<br /> By: J - Comments:In 3-96, two 10,000-gallon gasoline and one 10,000-gallon gasoline/diesel USTs were removed at
<br /> the subject site. Residual soil and groundwater contamination remains on-site. Based upon the limited
<br /> Date: extent of contamination reported in soil and groundwater, a stable groundwater plume with declining
<br /> 6128/2012 concentrations, no foreseeable changes in future land use(commercial), and minimal risks from soil vapor,
<br /> soil and groundwater, Regional Board staff concur with San Joaquin County's Closure Recommendation.
<br />
|