ARCHIVED REPORTS_PHASE II ENVIRONMENTAL SITE ASSESSMENT

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WGIK • Southwest, ]Inc. 5.4.10 Batteries and Quality Control Issues Although Learner's acceptance policy states they do not accept batteries, improper storage and labeling of damaged lead/sulfuric acid batteries was documented by the DTSC in May 2001 and October 2003 inspections. Learner reportedly conducts visual inspections of the contents of trucks as they enter the facility with loads of scrap. However, Learner records indicate materials which are not allowed do occasionally make their way past the check point and into the yard. Learner accepts 55-gallon drums into the facility that have been triple-rinsed and contain no residue, but it is left up to the discretion of the truck drivers to verify that this has been done. Additionally,the individual drivers rather than Learner employees are responsible for separating their loads and distributing materials to the proper storage areas. These are all considered potential sources of contamination and thus an REC. All samples were analyzed for lead, a CAM17 metal. 5.4.11 Automobile Debris on South Ditch Banks Visual observations reveal a large volume of rubber, metal and other automotive debris embedded in the surface soil along the eastern half of the south storm water drainage ditch adjacent to Learner (South Ditch). The debris that is currently exposed, as well as additional • debris that will be exposed due to erosion during the rainy season,has the potential to contribute contaminants to storm water runoff. Potential contaminants include copper, lead, zinc, nickel, aluminum, iron, automotive fluids, and sulfuric acid from batteries. Storm water percolating through the soil in this area will have an extended contact time with any debris present, potentially transporting contamination to the underlying groundwater. Due to the lack of data regarding the volume and content of debris at and below the surface, as well as the age of the debris, it is not possible to estimate the potential degree or extent of chemical impact from this material. The fact that rubber and other substances no longer accepted at the facility are readily observable in the soil shows that a wider variety of materials were accepted by Learner in the past. DTSC records document a possible automobile shredding operation on site in 1988, and a 1982 notation in the DTSC file indicates occasional fires break out on the site from "smashed autos". The abandoned shredder was observed on the Learner site during the Phase I investigation and had been dismantled and removed by the time of the Phase U fieldwork. The debris observed on the ditch banks is consistent with that produced by auto shredding operations. The unknown composition and age of the automotive debris and past practices on the site involving handling of automobiles and other vehicles constitutes an REC. Boring B-16 was located along the South • Ditch to investigate conditions in this area, and the exploratory excavations N-1 through N-7 704. PRI.05 12 July 21, 2008