SITE INFORMATION AND CORRESPONDENCE

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�-'WLE 1 - CHECKLIST OF REQUIRED DATA ` FOR NO FUR 'R ACTION REQUESTS AT UNDERGROUN4400pkNK SITES carp Name and LOC2tiOn: JLN Farms/Joe Panetta Property, 95 W. Eleventh St., Tracy, San Joaquin County (Case 391152) _� wn Distance to production wells formunicipal, domestic, A 1997 well survey for the adjacent unevror► sna JUWIILIFI .W Y supply2,000'o with the nearest l!!s 'culture, industry and other uses within 2000 feet of the site. /is upon�samplrng data, no we feet tlo the south are threatened due to this case. 2. Site maps, to scale, of area impacted showing locations Contained in several reports on file. Y . of any former and existing tank systems, excavation contours and sample locations, boring and monitoring well elevation contours, gradients, and nearby surface waters, buildings, streets, and subsurface utilities; Site lithology consists of sand, silt, and clay to focal depth of. Y 3. Figures depicting lithology (cross section), treatment 35 feet. system diagrams; Approximately 730 yds. of contaminated soil excavated Y 4. Stockpiled soil remaining on-site or off-site disposal (quantity); during corrective action was transported to Forward Landfill, Manteca. . A reported 13 monitoring wells installed over time. All monitoring wells will y 5. Monitoring wells remaining on-site, fate; be properly abandoned prior to formal closure per County. Depth to groundwater varied from --8 feet to -13 feet below ground -to 6. Tabulated results of a!! groundwater 0.036--ftlft. '-surface (bgs)�The groundwater -gradient -varied from 0:002 ` _ `"elevations and`depths to wale%' The downgradient groundwater flow direction varied from northwest to southeast. 7. Tabulated results of all sampling All data adequately tabularized in various reports, including closure report. and analyses: Y❑ Detection limits for confirmation sampling Lead analyses 8. Concentration contours of contaminants found and those remaining in soil and The extent of the identified groundwater, and both on-site and off-site: contamination shown in applicable Y❑ Latera! and FY] Vertical extent of soil contamination reports. Latera! and Vertical extent of groundwater contamination Zone of influence calculated and assumptions used for subsurface remediation Over -excavation was the yJ9. system and the zone of capture attained for the soil and groundwater remediation engineered remediation. system; 10. Reports /information FY]Unauthorized Release Form QY QMRs (from 2000 to 2009) F Well and boring logs E PAR FRP Other,• Closure Summary Report, 2009 Y 11, Best Available Technology (BAT) used or an explanation for not using BA71-naturalattehuation. emoval of USTs, over excavation and -.Y -12.-Reasons whTbackgrogo-drwas/is unattainable=usingBA'T,— -LirriitL-d so►! and`groundwater contamination remain`on- - site. y 13. Mass balance calculation of substance treated versus that The consultant estimates TPH-g removed from soil as 504 pounds, and TPHg remaining in soil as 104 pounds. remaining; �, 14. Assumptions, parameters, calculations and model used in Due to the depth of remaining TPHg in soil (12'-15" bgs) risk assessments, and fate and transport modeling; and existence of a vapor barrier installed for the building, a vapor intrusion survey was not required by the regulatory agency. Y 15. Rationale why conditions remaining at site will not adversely. Groundwater concentrations continue to decline with impact water quality, health, or other beneficial uses; and many wells already at non -detect. Consultant estimates WQGs reached by 2011. Site no longer poses a threat. By: JLB L Comments: Site (former Phillips station) is located adjacent to a 1997 closed UST site (Chevron), and property •!� use (commercial) is not expected to change. Due to remedial efforts in the source area, confirmation sampling has shown that this site no longer poses a threat to -human health and safety or to water quality. Regional Date: 10127!09 Board staff concurs with San Joaquin County's recommendation for issuance of a No Further Action letter.