SR0084772 - Laserfiche WebLink

Home Browse Search

Mr. C. Dean Hubbard –Central Valley RWQCB Additional Soil Investigation Work Plan April 29, 2014 TAOC 6th Street Tracy Rail Yard Page 2 Site. Collectively these pipelines are referred to as the CEMC Historical Pipeline Portfolio-Bakersfield to Richmond (HPP-BTR). The Site was formerly a Southern Pacific Transportation Company railroad maintenance facility, which was decommissioned in the 1940s. The Site was later used as a welding facility. Operations had ceased and the majority of site features were removed in the 1980s. The Site is currently owned by Union Pacific Railroad (UPRR), with the exception of OU-3 and OU-4, which were sold to the City of Tracy in 2006.2 Several historical soil and groundwater investigations have been conducted at the Site since 2004 on behalf of UPRR, City of Tracy, and a prospective purchaser of the Site. HPP-BTR investigations were conducted between 2009 and 2011 by AMEC Geomatrix (AMEC) within areas OU-2, OU-3, OU-4, and OU-5. Historical analytical results for these investigations were included in the AMEC 2010 Investigation Report 3 and 2012 Site Investigation Report Addendum 4. SCOPE OF WORK The purpose of the investigation is to delineate the extent of PAHs in shallow soil detected in boring TRY-29 (located within OU-5) during the 2010 investigation. A site map depicting the location of TRY-29 is shown on Figure 3. Elevated PAH detections were noted in a sample from 5 feet below ground surface (bgs) in TRY-29. A sample from approximately 15.5 feet bgs did not contain elevated PAH concentrations. Leidos proposes to advance four primary soil borings and a minimum of four step-out locations to 5 feet bgs. Should hydrocarbon-affected soil be encountered at a location, the boring will be advanced until clean soil is encountered, or to a maximum of 10 feet bgs. The four primary soil borings will be advanced approximately 3 feet north, south, east, and west of TRY-29. Initial step-out locations will be advanced 6 feet north, south, east, and west of TRY-29, as shown on Figure 3. Samples will be collected at 5 feet bgs and submitted to a California-certified laboratory. If potential crude-oil affected soil is encountered, additional samples may be collected and submitted for fuel fingerprinting and waste profiling. Primary soil borings will be analyzed for PAHs using United States (U.S.) Environmental Protection Agency (EPA) Method 8270 by selected ion monitoring (SIM). Samples collected from step-out locations will be placed on hold at the laboratory, pending primary boring analytical results. The scope of work will be implemented in accordance with the following investigation activities: • Verify access agreements for the private property on which borings are proposed. 2. AMEC, 2013. Human Health and Ecological Screening Evaluation, TAOC 6th Street Tracy Rail Yeard, Tracy, California. September. 3. AMEC, 2010. Investigation Report, TAOC 6th Street Tracy Rail Yeard, Tracy, California. July. 4. AMEC, 2012. Site Investigation Report Addendum, TAOC 6th Street Tracy Rail Yeard, Tracy, California. July.