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TATALE 1 - CHECKLIST OF REQUIRED ND TANK SITES
<br /> - FOR NO FURTHER ACTION REQUESTS AT UNDERGR
<br /> Site Name and Location: W.T.Jordan,298 West Grant!rine Road,Tracy,.San Joa�CountyM
<br /> Four water supply wells within 2,000 feet of
<br /> 1. Distance to production wells for municipal, domestic, agriculture, industry the site. One municipal well, one
<br /> and other uses within 2000 feet of the site; agricultural well, and two domestic wells.
<br /> one waste oil UST, and
<br /> 2. site maps, to scale, of area impacted showing locations of former and existing tank systems, three gasoline us7s were
<br /> excavation contours and sample locations, boring and monitoring well elevation contours, removed on 415/88.
<br /> gradients, and nearby surface waters, buildings, streets,and subsurface utilities;
<br /> Bdring logs and cross section provided.
<br /> 3. Figures depicting lithology(cross section), treatment system diagrams; Treatment system was not installed.
<br /> Approximately
<br /> l was
<br /> 4. Stockpiled soil remaining on-site or off-site disposal(quantity); ex avat d and transported to Forward Landfill.
<br />{
<br /> 0 5. Monitoring-wells remaining on-site, fate; 4 monitoring wells currently exist on-site.
<br /> 3'to 6'below ground—�:
<br /> F96. Tabulated results of all groundwater elevations and depths to water, surface and ground water flow is to the N/NW.
<br /> E7.Tabulated results of all sampling and analyses: June 1998 maximum ground water monitoring results(ug/1)from MW-4
<br /> Y show TPHg at 10,000;TPHd at 1,900;BTEX at 270, 840, 660,and 9,800,
<br /> ©Detection limits for confirmation sampling respectively;MtBE at<25. MW-4 and MW-5 destroyed in July 1998.
<br /> Lead analyses July 1999 maximum ground water results from remaining MWs are<DL
<br /> for all constituents except TPHd at 65 ug/l.
<br /> 8. Concentration contours of contaminants found and those remaining in soil Contamination has been defined on-site
<br /> and groundwater, and both on-site and off-site: and off-site into Grant Line Road. The west
<br /> Lateral and Y❑ Vertical extent of soil contamination side of the contaminated soils is defined to
<br /> 7'bgs. The northwest extent of ground
<br /> Lateral and Vertical extent of groundwater contamination water contamination has not been defined.
<br /> 9.Zone of influence calculated and assumptions used for subsurface
<br /> NA remediation system and the zone of capture attained for the soil and No remediation system used.
<br /> groundwater remediation system;
<br /> 10.Reports/information Unauthorized Release Form QMRs(Dates) 9/95 to 12/96;Annual 8197 to 7199
<br /> ❑ Well and boring logs PAR FRP Other.Closure Report,AGE, 8/10199
<br /> FNJ MN
<br /> 11.Best Available Technology(BAT) used or an explanation for not using BA 200 cubic yards of contaminated soft
<br /> . - r s - �.�. ._ . ,. .removed from.tank pits..
<br /> �� 12.Reasons why background warms unattainable using BAT,' Contaminated soils extend northeast from site under
<br /> Y Grant Line Road.
<br /> ❑ 13.Mass balance calculation of substance treated versus that remaining; Approximately 750 cubic yards of impacted
<br /> Y soil remains on-site and off-site.
<br /> 14.Assumptions,parameters, calculations and model used in risk
<br /> ❑ assessments, and fate and transport modeling,
<br /> 15.Rationale why conditions remaining at site will not adversely Based on three years of quarterly monitoring, the
<br /> EDimpact wafer qualify, health, or other beneficial uses;and contaminant plume is stable. Downgradient monitoring
<br /> well MW-6 has not been impacted.
<br /> NA 16.WET or TCLP results
<br /> Comments:Soil and ground wafer contamination center on MW-4. June 1998 ground water samples from MW-4 identified TPHg at
<br /> By: 10,000 ug/l,and benzene at 270 pgA MW-4 destroyed in 7198 due to widening of Grant Line Road. A replacement well was not
<br /> installed. According to the consultant,a City of Tracy Fire Department monitoring well located approximately 90 feet downgradient of
<br /> the site was non detect for petroleum hydrocarbons(no data was presented). MtBE was identified in one soil sample at 0.1 ppm,and
<br /> Da in ground water at a maximum of 59 ppb in MW-4(8/96). MtBE has not been detected from MWs in recent sampling events. A .
<br /> domestic well exists approximately 300 feet cross gradient to the site, and an irrigation well exists less than 1,000 feet downgradient
<br /> (�/p p from the site. A log was not provided for the domestic weft. The driller's log for the irrigation well indicates that a sanitary seal was not
<br /> ` installed,the well is cased and perforations are installed from 159 to 194 feet bgs. Public water is provided. Although high
<br /> concentrations of TPHg and BTEX exist in soil and ground water,monitoring data suggest the plume is stable.
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