Laserfiche WebLink
t 4 <br /> URS <br /> • i <br /> Mr. Robert McClellon <br /> January 31,2007 <br /> Page 5 <br /> To further enhance the effectiveness of the passive soil vapor extraction trench, we propose to install a <br /> solar vent system following your approval. The solar vent system will be installed within one or more of <br /> the vent pipes of the passive soil vapor extraction trench after removing the drilled portion of the PVC <br /> piping. Each solar vent system is capable of extracting 680 cubic feet per hour(cfh)up to a total of 2,760 <br /> cfh, if four vent systems are installed. The information on one type of a solar vent system is shown in <br /> Attachment 4. We plan to install either this system or an equivalent system. If you have any questions, <br /> please give me a call at(916)679-2081. <br /> Very truly yours, <br /> URS <br /> rJaKamine <br /> Engineer <br /> Enclosures: Table 1 —Field Measurement Results Summary <br /> Table 2—Volatile Organic Compounds in Groundwater Analytical Results Summary <br /> Table 3 —Dissolved Metals in Groundwater Analytical Results Summary <br /> Table 4—General Mineral in Groundwater Analytical Results and Field Measurement <br /> Results Summary <br /> Figure 1 —Site Plan <br /> Figure 2—Groundwater Elevation—December 2006 <br /> Figure 3 —Groundwater Elevation—June 2006 <br /> Figure 4—Groundwater Elevation—September 2006 <br /> Attachment 1 —Monitoring Well Sampling Logs <br /> Attachment 2—Tank Manifest and Destruction Certificate <br /> Attachment 3 —Analytical Report <br /> Attachment 4—Solar Vent Information <br /> cc: Judy McCampbell (RadioShack) <br /> John Macanas (CIWMB) <br /> Ross Atkinson(RWQCB) <br /> K:\Wprocess\25532\WorldEnterprise\Quarterly Rpt\4Q06\CovLtrRpt.doc <br />