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Work Plan for Installation of Temporary Soil Gas Sampling Probes, <br />Soil Gas Sampling, and Laboratory Analyses <br />ELLIS SUBDIVISION <br />WKA No. 12002.03 <br />August 8, 2018 <br />Page 2 <br />As crude oil contains the raw structure for all petroleum hydrocarbon based products, our <br />laboratory analyses will include the following chemicals of potential concern (COPCs): <br />Volatile organic compounds (VOCs) <br />Total petroleum hydrocarbons (TPH) as gasoline <br />TPH-diesel range <br />Proposed Scope of Work <br />WKA will utilize the California Environmental Protection Agency, Department of Toxic <br />Substances Control, Los Angeles Regional Water Quality Control Board and San Francisco <br />Regional Water Quality Control Board, Advisory Active Soil Gas investigations, dated July 2015, <br />to guide the number of soil gas well installation and sampling methodology and protocol <br />selection of the number of soil gas sample locations and the potential contaminants appropriate <br />for evaluating soil gas at the Site. <br />In preparation for installing the temporary sampling probes and collecting soil gas samples, <br />WKA will: <br />Installation of Temporary Soil Gas Sampling Probes and Soil Gas Sampling Activities <br />WKA will utilize Global Information System (GIS) software to identify 24 temporary soil gas <br />sampling probes at the Site. The locations of the 24 temporary soil gas sampling probes <br />(Figure 2) will be loaded into a high precision global positioning system receiver (GPSr). <br />The high precision GPSr will be used to navigate to the soil gas sample probes in the field. <br />WKA will utilize the services of Teg Northern California (Teg), a C-57 licensed drilling <br />company to install the 24 temporary soil gas sampling probes. Twelve of the 24 soil gas <br />sampling probes will be installed to a depth of five feet below ground surface (bgs). The <br />remaining 12 soil gas sampling probes will be installed to a depth of 10 feet bgs. The <br />sampling probes will be installed using the post run tubing (PRT) drive point method and <br />installing Nylaflow tubing into each PRT (Figure 3). <br />Teg will perform a shut-in/leak test at each sampling probe (Total of 16 soil gas <br />samples). Each soil gas sampling probe will be purged and allowed to equilibrate; <br />Teg will collect a soil gas sample from each sampling probe using summa vacuum <br />canisters. The canisters will be labeled to indicate a unique sample identification. The <br />samples will be analyzed in the field using Teg's certified mobile analytical laboratory for <br />the chemicals listed below: