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it <br /> — ATC Associates Inc. <br /> vi re <br /> A <br /> 1117 Lone Palm Avenue, Suite 201 <br /> Modesto, California 95351 <br /> 209-579-2221 <br /> Fur 209-579-2225 <br /> A S SO C I ATE S INC . <br /> The estimated GRO mass in soil should be considered an order of magnitude estimate and does <br /> not take into consideration hydrocarbon mass removed during the soil vapor extraction pilot <br /> testing conducted in 2008 . Refer to Table 4, which details the GRO soil mass calculations. <br /> 8.0 REMEDIATION APPROACH <br /> In October of 2008 ,, ATC conducted soil vapor extraction pilot testing to evaluate the feasibility <br /> of vapor extraction as a remedial option. The pilot testing results indicate soil vapor extraction <br /> would be an effective method for remediating petroleum impacted soil in the vadose zone <br /> beneath the site. Section 9. 1 summarizes these results. <br /> The site remediation strategy involves remediation of impacted vadose zone soils using vapor <br /> extraction and remediation of impacted groundwater via ozone injection. An ozone injection pilot <br /> test is pending and consequently, groundwater remediation details will be addressed in future <br /> submittals. Implementation of the soil vapor extraction system for remediation purposes will <br /> include the following activities : <br /> • Preparation of engineering plans and specifications; <br /> • Obtaining necessary permits; <br /> • trenching and installation of conveyance piping and plumbing; <br /> • Equipment procurement; and <br /> • Construction and installation of the treatment compound and setting the system equipment. <br /> The vapor extraction system will be monitored at least monthly or at the frequency specified by the <br /> San Joaquin Valley Air Pollution Control District (SJVAPCD). Soil vapor extraction has been <br /> demonstrated as an effective method to treat contaminant impacted soil above the groundwater and <br /> is expected to achieve site closure goals within a reasonable amount of time. Groundwater <br /> nnonitoring of selected monitoring wells will continue in accordance with the current monitoring <br /> schedule. <br /> 9.0 SOIL. VAPOR EXTRACTION SYSTEM DESIGN PARAMETERS <br /> 9A Pilot Testing <br /> Limited duration vapor extraction pilot testing was performed at the site in October of 2008 . The <br /> average radius of influence as measured during four single extraction well tests was <br /> approximately 37 feet at vacuum pressures in excess of six inches of mercury. Airflow rates were <br /> observed ranging from 22.49 to 200. 70 cubic feet per minute (efin) . Based on the laboratory <br /> analytical vapor data and field photo ionization detector (PID) measurements collected during the <br /> pilot test, VE2 appears to be the most impacted, and VEh appears to be the least impacted with <br /> SVE System Design Plan ATC Associates Inc <br /> Stockton City Taxi <br /> Page 8 <br />