SITE INFORMATION AND CORRESPONDENCE

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w -TA 1 CHECKLIST OF REQUIRED'C A- FOR NO FURTHER ACTION REQUESTS AT UNDERGROUND TANK SITES Site Name and Location: Owens Brockway, 14700 Schutte Road,Tracy,San Joaquin County 0 1. Distance to production wells for municipal, domestic, agriculture, A well receptor survey was not required. Two on-site industry and other uses within 2000 feet of the site; water supply wells are located within 1,000 feet of the former UST area. 2. Site maps, to scale, of area impacted showing locations of former and existing tank systems, One 300-gallon UST was excavation contours and sample locations, boring and monitoring well elevation contours, removed in 5/86. Site maps gradients, and nearby surface waters, buildings, streets, and subsurface utilities; are provided in the 3102 Investigation Report YE 3. Figures depicting lithology(cross section), treatment system diagrams; Site lithology consists of clayey silt and silty clay to 18 feet, the total depth investigated. FWJ 4. Stockpiled soil disposed off-site(quantity); The disposition of excavated soil was not presented. The solis were Likely returned to the tank pit excavations. rN_1 5. Monitoring wells remaining on-site, fate; Monitoring wells were not installed for the UST investigation. 6:Tabulated-results-of all-groundwaler elevations--and npthg-ta-wale,=Monitoring-wa is-were-not:installed-for-the-US.T-–—._ investigation. ", l 7. Tabulated results of all sampling and analyses: Soil samples collected below the former UST showed TPHg at Detection limits for confirmation sampling 3.9 mg/kg, total BTEX at 0.60 mg/kg,and lead at 15.7 mg/kg. Two soil samples from a single boring completed in 2102 were non-detect for all Lead analyses constituents including MtBE at acceptable detection limits. 0 Y 8. Concentration contours of contaminants found and those remaining in soil Soil contamination is limited to the former r and groundwater, both on-site and off-site: UST area. Soil samples collected at 10 and Y❑ Lateral and Y� Vertical extent of soil contamination 14 feet were non-detect for all constituents. ❑ Lateral and ❑ Vertical extent of groundwater contamination Groundwater was not encountered at a total vertical depth of 18 feet 9. Zone of influence calculated and assumptions used for subsurface Based on minor soil contamination at the N remediation system and the zone of capture attained for the soil and former UST area,site remediation was not groundwater remediation system; required.. 10.Reports/information 0 Unauthorized Release Form QMRs Y� Boring logs N❑ PAR N] FRP Y❑ investigation Report, 3/02 Y❑ 11.Best Available Technology(BAT) used or an explanation for not using BAT; The UST was removed. 12.Reasons why background warms Minor contamination remains in soil at the former UST area. The remaining unattainable using BAT,�� ._ . ,-- contamination does,nof.present asignificant tlireat:to:grflurdwater: - 13.Mass balance calculation of substance Based on the limited soil contamination identified at the former UST area,a treated versus that remaining; mass balance of remaining soil contamination was not required. 14.Assumptions,parameters, calculations and model used in risk Based on the limited soil contamination identified at the assessments, and fate and transport modeling, former UST area, a risk assessment was not required. 15. Rationale why conditions remaining at site will not adversely Minor contamination remains in soil at the former UST impact water quality,health, or other beneficial uses. area. The remaining contamination is limited in extent and does notpresent a significant threat to groundwater. By: Comments: The site is an active glass manufacturing facility. In May 1986, one 300-gallon gasoline UST was removed MH from the subject site, and one soil sample collected from the tank pit excavation identified low TPHg and BTEX constituents. In February 2002, two soil samples collected from an angle boring at 15 and 20 feet(10 and 14 vertical feet) were non-detect for all constituents including MtBE at acceptable detection limits. The Owens Brockway Company utilizes Date: holding ponds for process water, and five monitoring wells have been installed to monitor water quality and groundwater 613/02 flow direction relating to the holding ponds. The depth to water in these wells varies from 50 to 70 feet,and the calculated flow direction is to the northeast. Two on-site water supply wells are used for plant and fire protection water, and are approximately 1,000 feet cross gradient of the former UST area. Based on the limited soil contamination identified at this site, and the depth to first groundwater at 50 feet, Board staff concur with San Joaquin County's closure recommendation.