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nra h r RAGEIVE JEG .1 AN 0 � 1992 Y ECHNOLOGIE$1NC 269 Mount Hermon Rd suite 101 Scotts Valley,CA 95M � (4M)(4W 75117515 E E FEB 2 7 1992 ENVI ROWMI '`;- 2 January 1992 pEEVII / �L � Mr. Kenneth Earnest FAX (209) 583-3282 Ultramar, Inc. 525 West Third Street Hanford, California 93230 SUBJECT: System Monitoring Hata Beacon Station #W 800 Highway 12 Lodi , California Dear Mr. Earnest: The system at the above site was monitored on 25 November and 11 December 23 December 1991. The results are presented in the attached tables for your review. Included are summaries of the gas chromatograph analyses of the influent and effluent air streams. The system did not operate between 8 and 25 November due to a full water accumulator and a faulty thermocouple in the temperature controller. The thermocouple had been on backorder from the manufacturer. On 25 November, the thermocouple was installed, the system was restarted and a complete system monitoring was undertaken. All extraction wells remained open on this date. The site was visited on 27 November to confirm system operation and to recheck concentrations at several high wells which remained at the same levels as tested on 25 November. The system did not operate between 28 November and 4 December 1991 due to a broken belt on the vacuum pump. The system was serviced and restarted on 4 December 1991, and ran continuously through 23 December. On 10 December, the pipes to the above-ground manifold were insulated with neoprene for wintertime protection. Excess knockout water was accumulated during December due to the high vacuum being applied and the wet soil conditions. Extra water storage drums were brought to the site to store the extracted water. It appears that the system needs to be operated at a vacuum less than about 4" Hg to minimize the rapid accumulation of water.