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IWABLE 1 -CHECKLIST OF REQUIRED DATA`
<br /> FOR NO FURTHER ACTION REQUESTS AT UNDERGROUND TANK SITES
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<br /> Site Name and Location: Yamada Brothers, Inc., 15406 S. Tracy Blvd., Tracy, San Joaquin County(RB#390814)
<br /> y 1. Distance to production wells for municipal, domestic, Two domestic supply wells are located within 2,000 feet
<br /> agriculture, industry and other uses within 2000 feet of the site: of the Site, both are onsite within 150'of the USTs. The
<br /> active Site water supply well was ND from 2001 until
<br /> samplim ceased in 2008. The other Site well is inactive.
<br /> y 2. Site maps, to scale, of area impacted showing locations of f In July 1991, one 10,000-gallon gasoline UST and one
<br /> any former and existing tank systems, excavation contours and 10,000-gallon diesel UST were removed.
<br /> sample locations, boring and monitoring well elevation
<br /> contours, gradients, and nearby surface waters, buildings, 11
<br /> streets, and subsurface utilities; t
<br /> Y 3. Figures depicting lithology(cross section), treatment system Site Iithology consists of clay, silt, and sand to 25; the
<br /> diagrams, total depth investigated.
<br /> N 4. Stockpiled soil remaining on-site or off-site disposal(quantity); The fate of the excavated soil is not discussed in the
<br /> available reports. Ii
<br /> Y 5. Monitorin wells remainin on-site, fate; Seven monitoring wells(MW-1 through MW-T)will be properly abandoned.
<br /> 6. Tabulated results of all-groundwater Depth to groundwater varied from 4'to 7'bgs. Groundwater flow
<br /> elevations and depths to water; direction varied from west to southwest and groundwater gradient varied
<br /> from 0.001 to 0.009 ft/ft. iI
<br /> 7. Tabulated results of all sampling All data adequately tabularized in various reports, including closure report.
<br /> and analyses:
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<br /> Detection limits for confirmation.
<br /> sampling I,
<br /> Lead analyses
<br /> LYJ 8. Concentration contours of contaminants found and those remaining in soil and The extent of the identified
<br /> groundwater, and both on-site and off-site: contamination shown in applicable
<br /> reports.
<br /> 0 Lateral and Vertical extent of soil contamination
<br /> Latera!and Vertical extent of groundwater contamination
<br /> 9. Zone of influence calculated and assumptions used for subsurface remediation Batch.groundwater exiractibn was the
<br /> system and the zone of capture attained for the soil and groundwater remediation only approved remediation!/
<br /> system; I!
<br /> 10.Reports/information ❑Y Unauthorized Release Form QMRs 36 from 9/00 to 4/10
<br /> F Well and boring logs M PAR FRP � Other Closure Report(9110)
<br /> YJ 11,Best Available Technology(BAT) used or an explanation for not USTs removal,periodic batch groundwater
<br /> using BAT, I extraction, and natural attenuation. ii
<br /> Tiy 12. 'Reasons why background warms Minimal residual soil and groundwater contamination remains on-site.
<br /> ftainable using BAT; Groundwater contamination(TPHg, E,X are slowly declinhig)is limited
<br /> to one well(MW-4). 11
<br /> The consultant did not estimate mass removed in soil, and,estimates
<br /> 7Y 13.Mass balance calculation of substance treatedversus that remaining; one!b of TPHg remaining in groundwater.
<br /> Y714. Assumptions, parameters, calculations and The soli passed the Region 2 ESI-s. The consultant states the minima!
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<br /> model used in risk assessments,.and fate and mass in soil and groundwater does not indicate a potential for vapor
<br /> transport modeling; intrusion.Fate and transport modeling showed no impact over 50 years
<br /> to Site well. I�
<br /> Y 15. Rationale why conditions remaining at site Soil and groundwater contamination reportedly are limitediin extent.
<br /> will not adversely impact water quality, health, or Land use(commercial)is not expected to change in the foreseeable
<br /> other beneficial uses;and future. Vapor intrusion risk has been addressed. Water quality goals
<br /> will be reached in 10 to 20 ears. 11
<br /> By. JL Comments:In,July 1991, one 10,000-gallon gasoline and one 10,000-gallon diesel USTs were removed from
<br /> the subject Site. Based upon 36 quarters of groundwater monitoring showing a stable plume with declining
<br /> Date: concentrations, the limited extent of contamination remaining In soil and groundwater, no foreseeable
<br /> 12/30/2010 changes In land use, and limited threats from groundwater, soil and soil vapor intrusion, Regional Board
<br /> staff concur with San Joaouin ' I
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