COMPLIANCE INFO - Laserfiche WebLink

Home Browse Search

w_ '=MENTAL Background We understand that the California Department of Transportation (Caltrans) has acquired a portion of LKQ's Property as part of the State Route 4 Crosstown Freeway Extension Project (SR4 Project). The area of acquisition, located along the northern extent of the Property, is currently occupied by a surface water drainage basin and former outdoor automobile storage areas. Caltrans has conducted several limited site investigations at the Property, dating back to 2010. These investigations include a Preliminary Site Investigation (PSI) Report prepared by Geocon Consultants, Inc. in July 2010, and a Detailed Site Investigation (DSI) and Remedial Action Options Report prepared by Kleinfelder West, Inc. in June 2011. Both the PSI and DSI attempt to identify potential contaminants of concern (COCs) within the shallow soil and groundwater at the Property. In doing so, remedial actions have been suggested that could potentially affect the current land value of the proposed area of acquisition. The PSI and DSI reports, along with other supporting background information, were provided to Allwyn for review. Based on our recent Site reconnaissance,we propose the following scope of services to acquire additional data to support our understanding of the land acquisition by Caltrans. Drilling and Soil Sampling Allwyn,with the assistance of a drilling subcontractor(Vironex), proposes to drill a total of five (5) soil borings to approximately 10 feet below ground surface (bgs) within the area of acquisition using a direct push technology DPT rig (2.25" diameter). The borings will be continually sampled, and logged by a project geologist in accordance with Unified Soil Classification System (USCS).The soil will be screened using a PID, and samples will be collected at approximate depths of 2 feet and >_5 feet bgs from each boring. Cores of soil will be cut from the acetate sleeves at these approximate depths,the ends covered with Teflon, and then capped. The samples will be analyzed for Total Petroleum Hydrocarbons(TPH) by EPA Test Method 8015B, using a Silica Gel Cleanup to differentiate between naturally occurring and contaminant source carbon concentrations. Borings will be backfilled from depth (maximum 10' BGS) with neat cement, and inspected for completeness by a San Joaquin County inspector. Soil cuttings from drilling activities will be placed into a labeled container/drum at the Site.The waste will be properly disposed of by a licensed waste removal contractor following characterization results.