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LjeoCogieal7ec(urics 7nc. Page 3 Pitot Test Report g COE-Arco Project No. 750,2 August 8,2000 3.0 RESULTS OF PILOT TEST t The analytical results and field observations are discussed below. Summary analytical data is included in Appendix A, laboratory data are included in Appendix B. A site map with soil boring and monitoring well locations is included as Figure 2. j 3.1 Pilot Test On June 12, 2000 a soil vapor pilot p p test was conducted to evaluate the feasibility for site remediation using soil vapor extraction technology. In preparation for conducting the pilot test, the San Joaquin Valley Unified Air Pollution Control District (SJVUAPCD) was forwarded a copy of the work plan for conducting the pilot test. On March 15, 2000, the City of Escalon received approval for conducting the pilot test from the SJVUAPCD. For this test, a large capacity blower was temporarily attached to one of the vapor extraction wells and activated. Vacuum pressure was monitored at the other vapor extraction wells and the three surrounding groundwater monitoring wells that had screened intervals exposed :above the water table (MW-1, MW-2 and MW-3). The wells had 4.5 to 5.5 feet of screen above the water table. 'The emissions were monitored with an organic vapor meter (OVM) and air samples were collected for laboratory analyses. The data obtained from the pilot test was used to evaluate the site's pneumatic conductivity. I '3.1.1 Equipment { ' 'Blower A positive displacement rotary blower with the potential of 100 SCFM was used to extract air .from each well. The blower was attached to the wells with a temporary manifold system that included sampling ports. The internal combustion engine used for emission control supplied the power to the blower motor. �< is : Emissions Control Because the San Joaquin Valley Unified Air Pollution Control District required an emissions control device, an internal combustion engine (IC) was used to abate emissions. The IC uses compressed propane as an auxiliary fuel source. The effluent vapor stream is directed into the IC and the hydrocarbons in the stream are burnt in the cylinders as part of the combustion process. Field Instrumentation :Vacuum pressure drawdown was measured using Dywer Magnahelic differential pressure gauges. Emissions were screened using a Thermodyne photoionization detector (model OVM-580A). Volumetric airflow in feet per minute was measured with a "hot-wire" _ anemometer.