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WGIK <br /> • Sounth west, Inc. <br /> 12.7 Improper Storage and Handling of Hazardous Materials and Petroleum <br /> Hydrocarbons <br /> Elevated concentrations of TPH-d, THP-mo, O&G, zinc and lead were detected near the <br /> hazardous materials storage area and associated sump and may be the result of improper <br /> storage and/or handling of substances commonly used on site. Violations by Learner relating <br /> to the storage of waste oil, absorbent material containing oil and grease and spent activated <br /> charcoal have been documented by the DTSC in the hazardous materials storage area. Soil <br /> concentrations of zinc are in excess of TTLC limits for classification as hazardous waste and <br /> may be related to documented on-site usage of an automotive transmission product known to <br /> contain zinc compounds. Further investigation of this area is recommended. <br /> 12.8 Batteries and Quality Control Issues <br /> Mishandling of lead-acid batteries has been documented on the Learner site. The Phase II <br /> ESA revealed lead concentrations exceeding the TTLC limit in five of the shallow soil <br /> samples. The presence and mishandling of batteries on the site is considered a potential <br /> source of the lead. The samples exhibiting high lead concentrations were collected from areas <br /> where stockpiling and processing has occurred and near the ASTs/former USTs where vehicle <br /> • fueling and maintenance has been conducted. Low concentrations of VOCs and SVOCs were <br /> detected in some of the soil and groundwater samples, and additional investigation is <br /> recommended to further characterize the nature and extent of these constituents on site. <br /> 12.9 Automobile Debris on South Ditch Banks <br /> The automotive debris appears to be largely restricted vertically to the upper six inches of soil <br /> along the South Ditch banks and access road, with localized zones up to two-feet thick. <br /> Laterally, the debris was determined to extend from the east Learner site boundary westward <br /> along the ditch for up to approximately 980 feet. Its composition appears consistent with that <br /> produced by automobile shredding operations. <br /> A zinc concentration above the TTLC limit for hazardous waste, as well as nickel, lead, <br /> copper, cadmium and chromium exceeding reference levels and O&G, TPH-mo and TPH-d <br /> were detected in the shallow soil of the South Ditch bank on the Learner site. Zinc and copper <br /> concentrations in two soil samples collected from the base of excavations made off site along <br /> the south bank are higher than reference levels, suggesting impact to underlying soil from the <br /> debris. Low concentrations of TPH-d and TPH-mo were also detected in these samples taken <br /> below the debris layer. Further investigation of the chemical constituents present in the <br /> • automotive debris and in the underlying soil is recommended. <br /> 704. PRI.05 32 July 21, 2008 <br />