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i <br /> Bioremediation pilot test study indicated that both oxygen and nutrient augmentation are feasible <br /> treatment technologies for the impacted soil and groundwater at this site Based on the pilot test <br /> I results, air sparge/soil vapor extraction was selected as the best treatment technology for the site <br /> However, enhanced bioremediation will also play a role, as oxygen augmentation to the <br /> subsurface will be supplied by the air sparge/soil vapor extraction wells <br /> IThe pilot test results indicated a sparge radius of approximately 10 feet and a soil venting radius <br /> of about 30 feet Using the pilot test well spacing data, the conceptual treatment system design <br /> would include approximately seventeen sparge wells and four soil venting wells (Figure 9) The <br /> wells will be aligned in a row extending downgradient from the former UST tankpit to the MW-3 <br /> monitor well cluster near the site property line The sparge wells will be connected to a <br /> compressor(s) in the treatment compound with flexible high pressure air hose The soil venting <br /> wells will be connected to a blower(s) in the treatment compound with schedule 40 PVC piping <br /> The wells and piping will be completed below grade Based on the pilot test off-gas analytical <br /> results, the air sparge/soil vent system exhaust will require treatment to meet air quality <br /> standards <br /> 4.5 Technology Implementation Workplan <br /> Following approval of the conceptual design of the recommended treatment technology by the <br /> fSan Joaquin County Public Health Services, Environmental Health Division, AES-RS will <br /> finalize the design in a Remedial Action Plan (RAPThis will include the following items <br />' 1 A summary of site assessment results <br /> 2 A statement of qualifications for the treatment system designed <br /> 3 Treatment system design, type of equipment and operation specifications <br />' 4 Treatment system flowchart and logic control diagram <br /> 5 Plot plan showing location and arrangement of the treatment system components <br /> 6 Plot plan showing soil and groundwater impacts in relation to the treatment system <br />' 7 Proposed treatment project schedule <br /> 8 Proposed treatment system monitoring schedule <br />' 9 Proposed treatment effectiveness evaluation <br /> 10 Verification sampling plan <br /> 11 Community Health and Safety Plan <br />' 12 Permitting and notification requirements <br /> After approval of the final treatment system design, AES-RS will implement installation of the <br />' system as follows <br /> 1 Notify all required parties, local, state, and/or federal, of treatment system <br />' implementation schedule <br /> 2 Obtain all construction and operating permits required for implementation of the <br /> treatment system <br />' 3 Locate and mark underground utilities prior to construction activities <br /> 4 Install air sparge/soil vapor extraction wells (note— soil disposal will be required) <br /> 5 Install treatment system compound and components <br />' '�Guj�o <br /> 14 ®� <br />' ACES <br />