SITE INFORMATION AND CORRESPONDENCE

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Yy Tl 1 -CHECKLIST OF REQUIRED DATA FOR NO FURTHER ACTION REQUESTS AT UNDERGROUND TANK SITES Site Name and Location: Tracy Unified School District, 51 East Beverly Palco�, Tracy, San Joaquin County Y 1. Distance to production wells for municipal, domestic, agriculture, industry ,I One on-site irrigation well was destroyed in August 2000. No other water supply wells and other uses within 2000 feet of the site; r were reported within 2,000 feet of site. 2. Site maps, to scale, of area impacted showing locations of former and existing lank systems, In 9985, one 550-gallon excavation co.Ontours and sample locations, boring and monitoring well elevation contours, gasoline tank was removed gradients, and nearby surface waters, buildings, streets, and subsurface utilities; from the site. 3. Figures depicting litholo gy(cross section), treatment system diagrams; 4. Stockpiled soil remaining on-site or off-site disposal(quantity); LEI None recti rded!il M Ij NA 5. Monitoring wells remaining on-site, fate; No monitoring wells were installed at the site. 'E r was not encountered during the site r- ndwate NA 6. Tabulated results of all groundwater elevations and depths to water Grou investigation but is estimated at 45 feet bgs. 7. Tabulated results of a!!sampling and analyses: it !n 1985,low concentrations of petroleum constituents were detected in �Y soil and groundwater grab samples. In July 2000, two soil borings IqDetection limits for confirmation sampling were installed at the site. Soil and groundwater samples from the Lead analyses borings were non-detect for analyzed constituents, including Y oxygenates. FE8. Concentration contours of contaminants found and those remaining in soil jR and groundwater, and both on-site and off-site: Lateral and Vertical extent of soil contamination i Lateral and Y❑ Vertical extent of groundwater contamination i NA NA y N 9. Zone of influence calculated and assumptions used for subsurface No remediation system was installed. remediation system and the zone of capture attained for the soil and r groundwater remediation system; p M10.Reports/information El Unauthorized Release Form NA QMRs(Dates) ❑Y Well and boring logs Y❑ PAR NA FRP 0 Other(report name)Aug 00, Site Characterization Report 1� 'figfi 1 ;! 11.Best Available Technology(BA T) used or an explanation for not using BAT, The tank was removed from the site. 12.Reasons why background wasps unattainable using BAT; Minor contamination possibiy remains in site soil. i Nbalance calculation of substance treated versus that remaining; None submitted. 13.Mass 14.Assumptions,parameters, calculations and model used in risk t assessments, and fate and transport modeling, Y at site will not adverse! Analytical results show that groundwater was not 15.Rationale why conditions remaining y impacted by the tank release. impact water quality, health, or other beneficial uses;and M �16.WET or TCLP results In 1985, total lead, as high as 13 mg/kg, was detected in soil between 5 and f5 feet bgs. The consultant(San Joaquin Company Inc)indicates that the lead concentrations are within the range for natural! !`occurrfn lead in soils in the Trac area. By Comments:Following tank removal, low levels of petroleum hydrocarbon's were detected in soil and groundwater. in July 2000, two soil borings (PP-1 and PP-2) were installed at the site. PP-i was installed approximately 30 feet north Date: (downgradient) of the former tank pit to a depth of 16 feet. PP-2 was installed adjacent to the pit, to an angular depth } of 10 feet beneath the pit. 5ai1 and groundwater samples were collected from both borings. No analyzed i t constituents, including fuel oxygenates were detected in the samples. An' abandoned irrigation wail was located on- site, but it was destroyed in August 2000. Based on the absence of groundwater contaminants and nearby receptors, staff concurs with the San Joaquin County staff closure recommendation. I