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Revised Remedial Action Plan Mc6illin Real Estate Investment Property 2154 South El Dorado Street,Stockton,California Page 8 Electrical SVstem Apex inquired with Pacific Gas & Electric (PG&E) as to permitting requirements for both electrical power and natural gas to operate the MPE system. Once the RAP has been approved, Apex will move forward with discussion with PG&E staff about permitting,costs, and scheduling. Well Permitting Apex will obtain permits for each of the MPE wells proposed under this revised RAP from the San Joaquin County Environmental Health Department(SJCEITD). After obtaining the permits, Apex staff will contact SJCEHD in accordance with permit conditions so that an inspector will have an opportunity to observe the construction and completion of the MPE wells. Copies of well completion reports for all newly completed MPE wells will be forwarded to SJCEIID to close out the permitting process. Multi-Phase Extraction Well Installation Apex proposes to retain the services of a California C-57 licensed contractor to install six(6)MPE wells(MPE-1 through MPE-6)at the Site. The proposed 4-inch diameter wells will be located and spaced within the hydrocarbon plume (Figure 3) The proposed MPE wells will be drilled to a total depth of 45 feet bgs. The top five (5)feet at each location will be hand augured as a further precaution to avoid conflict with buried utilities. The proposed construction detail for the MPE wells is shown on Figures 5A. In summary, each MPE well casings will be 4-inch diameter, Schedule 40 PVC, to a total depth (described above). The well screens will be 0.050-inch slotted screen and placed from 25 and 45 feet bgs. A Pea Gravel filter pack will be installed to one foot above the screened interval followed by a two-foot bentonite seal and neat Portland cement to the surface. Each of the MPE wells will be properly developed prior to collection of groundwater samples and system startup to prevent system fouling from silts and sediment. The attached Figure 5b depicts the existing VW-I through VW-3 and their proposed detail use as Multi-Phase Extraction Wells. All soil cuttings fiom the MPE well installation process will be retained onsite in Department of Transportation-approved 55-gallon steel drums, pending proper disposal at an off-site location under manifest. Soil Sampling Soil samples from wells MPE-I through MPE-6 will be collected at 5-foot intervals and at obvious lithologic changes. A minimum of two (2) soil samples from each boring will be submitted to a State-certified laboratory under chain-of-custody (COC) documentation for analysis as summarized in the table below. Soil lithology, visual,and olfactory observations will be recorded in the field. In addition, all soil samples will be field screened with the use of a photo ionization detector (PID). Soils encountered during the well installations will be logged according to the unified soil classification system, under the supervision of a State of California registered professional geologist.