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1 Rrestone Service Center 400 North El Dorado, Stockton, California 4 February 2, 1994 Soil Remediation Plan— 2072.01 Page 3 of 6 • Due to the difference in soil media between the wells, only one well will operate at a time Based on the limited extent of hydrocarbon impacts, the single well extraction system (per identified soil layer) is projected to have a sufficient radius of influence to reach the impacted areas. Since the maximum vertical extent of observed contamination is within 30-feet of the surface and groundwater has not been encountered at this site to a depth of 41 .5-feet, groundwater is presumed to be unimpacted by the release and should not be affected by proposed VES system operation 3.2 Vapor Extraction Equipment/System Connections The equipment for the vapor extraction process will include a skid-mounted unit consisting of an explosion-proof regenerative blower designed to operate at 60- standard cubic feet per minute (scfm) and 46-inches of water, a vapor entrapment canister which protects the blower from moisture, a flow meter and vacuum gauge, and a carbon canister for treatment of extracted vapor prior to discharge. It is projected that one carbon canister will be sufficient, however, system monitoring will verify the treatment requirements The carbon canister can be readily replaced as necessary . The vapor extraction wells will be connected to the system by PVC or HDPE pipe Pipe will be placed in a trench from the well head to the corner of the building within the city right-of-way. The trench will be backfilled with soil or gravel and resurfaced with concrete to meet the existing sidewalk grade Steel pipe may be utilized for the exposed section of pipe Isolation valves will be installed on the connection pipe for each well to facilitate well selection A single header pipe will be connected to the blower, housed outside of the building. The VES unit will be secured behind a locked fence and protected from weather. A plan view of the system is shown in Figure 3 During the site monitoring visits, necessary operation and maintenance tasks will be performed The equipment will be lubricated and filters will be checked The blower oil level and the liquid level in the moisture separator will be inspected System adjustments or repairs will be made accordingly 3.3 Monitoring Monitoring points will be utilized to evaluate the effectiveness of each extraction well and verify the radius of influence A combination of five monitoring points screened at a range of depths and distances from the extraction wells are proposed for data collection and system evaluation. The 2-inch diameter monitoring well, RYANM[JRPHY, ]WOORPORATIM Dehio Comfroction Los Angdo