Laserfiche WebLink
CE � <br /> GENESIS ENGINEERING&REDEVELOPMENT <br /> 2.3 Geology and Hydrogeology <br /> The Site is located in the Great Valley Geomorphic Province of California. The Great Valley <br /> is an alluvial plain where sediments have been deposited for about 160 million years. Soil <br /> borings drilled during the Preliminary Endangerment Assessment encountered tan silty sand <br /> in the upper 5 feet below the ground surface ("bgs"). Depth to groundwater is approximately <br /> 28 feet bgs. <br /> 2.4 Site Characterization Activities <br /> A Preliminary Endangerment Assessment(PEA)was performed in 2010-2011 to <br /> characterize current conditions at the Site(Arcadis 2012). During June 2010, soil samples <br /> were collected from forty-eight locations up to depths of 2 feet bgs. During April 2011, an <br /> additional thirteen soil samples were collected up to depths of 1.5 feet bgs. An on-Site <br /> domestic water supply well was also sampled in 2011. In total, ninety-six samples(including <br /> ninety-four soil samples, one ash sample, and one groundwater sample)were collected. Soil <br /> and ash samples were analyzed by one or more of the following methods: <br /> • California Assessment Manual ("CAM") 17(Title 22)Metals using U.S. EPA <br /> Method 6010B <br /> • Hexavalent chromium using U.S. EPA Method 7196A, mercury using U.S. EPA <br /> Method 7474A, and soluble lead using U.S. EPA Method 6010B <br /> • Organochlorine pesticides ("OCP")using U.S. EPA Method 8081A <br /> • Dioxins using U.S. EPA Method 8290 <br /> • Semi-volatile organic compounds ("SVOC") using U.S. EPA Method 8270C <br /> • Polycyclic aromatic hydrocarbons("PAH") using U.S. EPA Method 8270C SIM <br /> • Polychlorinated biphenyls("PCB") using U.S. EPA Method 8082 <br /> • pH using U.S. EPA Method 9045D <br /> • Total petroleum hydrocarbons ("TPH") using U.S. EPA Method 8015B <br /> • Chlorinated herbicides using U.S. EPA Method 8151 <br /> • Organophosphate pesticides using U.S. EPA Method 8141 <br /> • Volatile organic compounds("VOC") using U.S. EPA Method 8260B <br /> The groundwater sample was analyzed for: <br /> • Metals by CAM 17 and EPA 6010B <br /> • Dissolved metals by CAM 17 and EPA 6010B <br /> Former Gordon Research Company Property 2 of 20 <br /> Removal Action Workplan <br /> June 2017 <br />