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U-Haul#709-50
<br /> Preliminary Site Conceptual Model Blaes Environmental
<br /> December 15,2006
<br /> Concentration contours and the approximate extent of TPHg, TPHd, Benzene and 1,2-DCA in
<br /> groundwater for the "B"horizon are presented in Figures 9, 10, 11, and 12, respectively Analytical results
<br /> are summarized in Table 6
<br /> Analytical results of groundwater samples collected from the lower "C" casing wells, screened between
<br /> approximately 60 and 100 feet bgs, revealed the highest concentration of hydrocarbons to be located
<br /> around well MW-4C (TPH), MW-6C (benzene), and MW-14C (1,2 DCA) Concentration contours and
<br /> the approximate extent of Benzene and 1,2-DCA in groundwater for the "C" horizon are presented in
<br /> Figures 9, 10, 11, and 12, respectively Analytical results are summarized in Table 6
<br /> The Iaboratory analysis of fuel additives MTBE, TBA, DIPE, ETBE, TAME, 1,1-DCA, 1,2-DCA
<br /> indicated concentrations above laboratory reporting limits in samples from wells MW-1B, MW-2C,
<br /> MW-3B, MW-3C, MW-4C, MW-6C, MW-7C, MW-8B, MW-8C, MW-9B, MW-1 IB, MW-1 IC, MW_
<br /> 14B, and MW-14C Refer to the analytical report included in Appendix L for details
<br /> Based on the third quarter 2006 analytical results, there appears to be limited communication between the
<br /> "B" and "C"horizons The light non-aqueous phase liquids (LNAPLs) such as TPH and BTEX, generally
<br /> exhibit higher concentrations in the "B" horizon while the heavier dense non-aqueous phase liquids
<br /> (DNAPLs) such as 1,2 DCA, have penetrated more extensively into the "C"horizon
<br /> 4.45 Investigative Derived Waste Disposal
<br /> Soil cuttings generated during soil boring drilling and well construction were temporarily stored in 22 DOT-
<br /> approved steel drums The drums were properly labeled and stored on-site pending proper profiling and
<br /> disposal at a Iicensed facility In addition,two DOT-approved steel drums of well development water, as well
<br /> as approximately 600-gallons of purged groundwater contained in a 1,000-gallon poly-AST, were properly
<br /> labeled and stored on-site pending proper profiling and disposal A composite soil sample was collected from
<br /> the drummed soil cuttings and subrrutted to Test America for TPHg and TPHd by Method EPA 8015, BTEX
<br /> by EPA Method 8021B, and Total Lead Integrated Wastestream Management (rVVM) of San Jose,
<br /> California transported 22 drums of soil, two drums of water, and 600-gallons of water from the site to Seaport
<br /> Refining & Environmental on April 27, 2006 as well as an additional 1,155-gallons of water on October 16,
<br /> 2006 Certificates of disposal for the soil and water as well as the laboratory analytical report for waste
<br /> . characterization analysis is included as Appendix M
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