ARCHIVED REPORTS XR0011331 - Laserfiche WebLink

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l ? ACTON • RECEIVED MICKELSON • van DAM, INC. N O V Q 9 ' i Consulting Scientists, Engineers,and Geologists November 4, 1994 RECEIVED NOV is 1994 Mr Kenneth Earnest ENVP�M r �E�{v PERTAL MIT/SERVICES Ultramar Inc 525 West Third Street Hanford, California 93230 19005 1317 Subject Third Quarter 1994 Remediation Status Report--Former Beacon Station #494 Located at 2185 East Fremont Street, Stockton, California Dear Mr Earnest Acton • Mickelson • van Dam, Inc. (AMV), prepared this letter to document remediation activity at the referenced site during the third quarter of 1994, specifically, the period from June 22 to September 22, 1994 Table 1 summarizes the performance of the vapor extraction system Figure 1 graphically presents hydrocarbon extraction rates versus time for the vapor extraction system The vapor extraction system ran a total of 77 days in the 92-day reporting period for an operating efficiency of 84 percent Following is a month-by-month summary of activity for both the vapor extraction system and ground water extraction system June 22 to July 20, 1994 The vapor extraction system ran continuously during the 28-day reporting period Over the 28-day operating period, the vapor extraction system extracted an estimated 437 pounds of hydrocarbons (based on field readings) Laboratory results for influent air bag samples collected on July 6 and 20, 1994, indicated the average benzene fraction was 0 15 percent The resulting estimated benzene extraction was 0 6 pound As of July 20, 1994, the cumulative totals for extraction amounts since start-up of the system were 12,093 pounds of hydrocarbons and 211 pounds of benzene During this reporting period, the ground water extraction system pumped continuously and extracted 8,633 gallons of water from monitoring well MW-3 As of July 20, 1994, the ground water extraction system extracted a cumulative total of 91,172 gallons from monitoring well MW-3 irpt151 mi 4511 Golden Foothill Parkway, Sults 1 (916) 939-7550 El Dorado Hills,Cahfornia 95762 Pax (916)939-7571}