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r <br /> MM RECEIVED <br /> J U N 2 2 1992 <br /> TECHNOLOGIES,INC <br /> 289 Mount Herman Rd, Suite 1o1 <br /> (Scotts Wley, CA 95 6 40297511 aft A 't <br /> r3 <br /> TSI,X( 438-7515 <br /> AUG 0 3 9992 <br /> 19 June 1992 ENVIRONMENTAL HEALTH <br /> PERMIT/KRVIft- <br /> Mr. Kenneth Earnest FAX (209) 583-3282 <br /> Ultramar, Inc. <br /> 525 West Third Street <br /> Hanford, California 93230 <br /> SUBJECT: ULTRAMAR STATION #696 <br /> Soil Vapor Extraction System Monitoring Data <br /> 100 SCFM Catalytic Incinerator <br /> 800 Highway 12 <br /> Lodi , California <br /> Dear Mr. Earnest: <br /> The vapor extraction system at the above site was monitored on <br /> 19 May and 3 June 1992. The results are presented in the attached <br /> tables for your review. Also attached are copies of chromatograms of <br /> the influent and effluent air streams and a site plan showing the <br /> layout of the vapor extraction system. <br /> 19 May 1992 Monitoring: <br /> The system operated 4.2 days (per hours meter) from the previous <br /> monitoring on 6 May 1992. The outage was apparently caused by <br /> overamping or a power interruption. The system was restarted 18 May <br /> and purged 24 hours prior to monitoring on 19 May. A decline was <br /> observed in the concentrations at most of the extraction wells. The <br /> system vacuum declined slightly to 7.9" Hg with ambient dilution <br /> remaining completely closed. <br /> MW-19 remained the single "hot spot" on the system. While <br /> concentrations generally declined at most extraction wells (see Table <br /> I), MW--19 stubbornly remained the only well maintaining a four-digit <br /> concentration. On this date, the system was extracting approximately <br /> 14 pounds per day of hydrocarbons from the soil , largely from MW-19. <br /> 3 June 1992 Monitoring: <br /> The system operated continuously from the previous monitoring on <br /> 19 May. A "drive-by check" on the equipment was done on 28 May and the <br /> system was observed to be in normal operating order. On 3 June, a <br /> decline was observed in the concentrations at most of the extraction <br />