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' Problem Assessment Report Page 10 Ranch Market,23569 South Santa Fe Road,Riverbank,CA November 8 2000 1 following parameters were monitored and recorded during the feasibility tests at the noted frequency ' • Applied vacuum and extraction flow rate at the extraction well head every 15 minutes, ' • Air sparging pressure and flow rate at the compressor discharge every 15 minutes, • DO and depth to water(DTW) in wells prior to initiation of SVE tests, prior to ' initiation of the AS test, at the end of SVE/AS test, and at the end of the SVE tests ' • Contaminant concentration readings in the extracted vapor stream using an FID and a LEL102 meter, + Oxygen concentration readings in the extracted vapor stream using a LEU02 ' meter, and, Influent vapor samples from vapor extraction wells V-1, V-2, V-5, and V-6 Influent vapor samples were also collected during the combined six well SVE ttest and during the six well S VE/AS test A total of seven air samples were collected in Tedlar bags and submitted to Kiff Analytical, a ' California-certified laboratory for analysis of BTEX, TPHg, and MTBE by EPA Methods 8260B ' 7.2 Feasibility Test Results 7.2.1 Vapor Extraction Results for Tests#1, #2, and #3 ' Prior to conducting the SVE test on October 2, 2000, the static depth to water and dissolved oxygen concentration was monitored in wells MW-1, MW-2, MW-3, MW-4 and AS-1 (Table 5) Depth to water and dissolved oxygen readings were also collected prior to termination of ' the SVE tests using well V-2, V-1, and V-5 Three separate SVE tests were conducted using wells V-1, V-2, and V-5 Vapor was ' extracted from each well for approximately 3 hours at flow rates ranging from 94 5 to 129 1 scfm in V-1, 18 6 to 38 1 scfm in V-2, and 95 5 to 1313 scfm in V-5 (Table 6) Applied ' vacuum rates ranged from 50 to 100 inches of water(in H2O) The applied vacuum reached 100 in H2O in V-2, but was reduced to 75 in H2O in V-1 and V-5 due to upwelling of groundwater within the vapor extraction wells The FID readings collected from the vapor ' extracted from wells V-1, V-2, and V-5 was 10,000 parts per million (ppm) through out the test (Table 6) During the three SVE tests no significant increase in dissolved oxygen was observed and groundwater rose Iess than 1 inch in the offsetting groundwater monitoring ' wells (Table 5) During Test#1 induced vacuum readings greater than 0 2 in H2O were reported in wells V-3 ' and V-4 located 15 feet and 10 feet away from extraction well V-2 Wells V-1, V-5, and V-6, located 23 to 42 feet away from the extraction well, had induced vacuums less than 0 13 in • H2O File PAR-rcport doe SHCOR International Incorporated r