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3rd Quarter SVES Report - Beacon #492, Manteca 14 October 1992 <br /> On 26 June, the system was restarted by EVAX Technologies, Inc. The <br /> nearest neighbor indicated he was satisfied with the measures taken to <br /> control the sound and the operation proceeded without any noise <br /> complaints. All five extraction wells were left open on this date to <br /> Purge the soils at a vacuum of 4.0" Hg. <br /> A letter with a complete summary of the start-up monitoring results was i <br />�+ sent to the SJUVAPCD in early July. <br /> 30 June 1992 Monitoring: <br /> The first full monitoring was conducted on this date. The SVES had <br /> gone down temporarily on the morning of the 30th due to a power outage. <br /> The system was restarted and purged prior to monitoring. ; <br /> E <br /> Vapor extraction wells VW--4 and VW-5 indicated the highest <br /> concentrations at 1,500 and 900 ppm , respectively. Wells VW-6 and MW- <br /> 1 were closed due to low concentrations. <br /> Given the relatively low 1,000 ppm system influent concentration, <br /> ambient dilution was comp`1etely closed on this date with the intention <br /> of keeping it closed for the duration of the program. The closure of <br /> ambient dilution, coupled with the closure of the two vapor wells, <br /> raised the system vacuum to 6.0" Hg. <br /> E <br /> The SVES was removing a program high 28 lbs/day of hydrocarbons from <br /> the soil on this initial date of monitoring. <br /> 8 July Special 1992 S al Site Visit <br /> t <br /> A special site visit was undertaken on this date to restart the system <br /> following an apparent power outage reportedly occuring on 6 July, The <br /> SVES was restarted, purged and the wells monitored 9 <br /> Concentrations had declined at all well locations Well VW-7 was = <br /> closed due to low concentration rasing the system vacuum to a program <br /> high 8 1" Hg <br /> s <br /> 13 July 1992 Restart Visit <br /> The SVES was originally scheduled for monitoring on this date. <br /> However, upon arrival at the site, the system was found to inoperative i <br /> apparently due to another power interruption on 10 July. The system <br /> was restarted and rescheduled for monitoring on 17 July 1992. <br /> - 3 - <br />