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ARCADES Mr. McKinley Lewis, Jr. <br /> April 20, 2011 <br /> PEA Summary <br /> Forty-eight shallow soil borings were advanced at the Site in June 2010. Results of <br /> the sampling activities were provided to the DTSC in September 2010. Summary <br /> Tables 1 through 9 are included as Attachment 1. The Site Plan showing the sample <br /> locations and potential areas of concern identified in June 2010 is depicted on Figure <br /> 1 (Attachment 2). <br /> Soil samples were analyzed for multiple parameters, including: <br /> • total metals using U.S. Environmental Protection Agency(EPA) Method <br /> 6010B <br /> • chromium speciation using EPA Method 7196A, mercury using EPA Method <br /> 7474A, and soluble lead using EPA Method 6010B <br /> • organochlorine pesticides (OCPs)using EPA Method 8081 A <br /> • dioxins using EPA Method 8290 <br /> • semivolatile organic compounds(SVOCs)using EPA Method 8270C <br /> • polychlorinated biphenyls (PCBs) using EPA Method 8082 <br /> • pH using EPA Method 9045D <br /> • total petroleum hydrocarbons (TPH) using EPA Method 8015B <br /> • chlorinated herbicides using EPA Method 8151 <br /> • organophosphate pesticides using EPA Method 8141, and <br /> • volatile organic compounds(VOCs) using EPA Method 8260B <br /> A total of 25 soil samples were measured for pH. The measurements ranged from a <br /> minimum of 4.6 to a maximum of 6.8 standard units. Generally, the soil at the Site <br /> falls within the acidic pH range. The lowest pH levels were at the location of former <br /> fires on a sample from the ash in the silo and at the former foundation south of the <br /> shed (Figure 1, Attachment 2). <br /> Page: <br /> Final PEA Work Plan Addendum-AprI I-RV009808 doc 3/11 <br />