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i RECEEIVED r AY 7 2 it,2 Ft B 192 ENVIRONMENT,%% IIF ALTI ! • VITECHNOLOGIES,INC P r 269 Mount Hermon Rd Suite 101 Scoffs Valley,CA 95066 (408)438 7511 FAX(408)438 7515 21 February 1992 Mr. Kenneth Earnest FAX (209) 583-3282 Ultramar Inc. 525 West Third Street Hanford, California 93230 Subject: ULTRAMAR STATION #695 Soil Vapor Extraction System Monitoring Data 500 SUM Catalytic Incinerator 900 South Cherokee Lane Lodi , California Dear for. Earnest: The vapor extraction system at the above site was monitored on 22 January and 7 February The results are presented in the attached tables for your review. Also attached are copies of the influent and effluent chromatograms and a site plan showing the layout of the vapor extraction system. On 22 January, a complete system monitoring, including wells, probes, and system totals, was undertaken. Extraction points VP-1, VP-4, MW-1, MW-4 and MW-22 were closed due to low concentrations. The two equally drawing ambient dilution valves were closed to the point where the vacuum pump drive motor was drawing 98% of its maximum amperage rating. At the conclusion of this monitoring, 10 of the system's 23 extraction points were left open and the system was extracting approximately 295 pounds of hydrocarbons per day. Extracted water continued to be a problem during January and was present in several extraction lines. As of 22 January, six extraction lines remained closed due to water clogging. The accumulator barrel was filling to capacity about once per week. On 31 January, the system was checked and serviced. The system could not be monitored because all the analytical instruments were stolen from our technician's van on this date. The system was initially down • upon arrival due to a lack of propane. The propane company was again contacted and reminded to check the propane tank two times per week. The propane company refilled the tank and the system was restarted.