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Mr. Nuel Henderson <br /> Page 4 of 4 <br /> groundwater sampling schedule described in Table 4 pending the possible transfer of sampling <br /> responsibility for several of the wells. <br /> Vapor Extraction System Operation <br /> The analytical data collected during the previous quarter indicate a fairly substantial rebound <br /> since the system was idled in 2002. An initial hydrocarbon extraction rate of at least 20 <br /> pounds per day could be anticipated if the system were in operation. By focusing on wells <br /> VW2, VW5 and VW6, this rate could quite likely be increased. Only by placing the system <br /> back in operation can it be determined how quickly vapor concentrations will decrease. We <br /> recommend placing the system back in operation as soon as repairs can be made. <br /> Work Proposed for First Quarter 2006 <br /> The next quarterly groundwater sampling event is scheduled for March 2006. We propose to <br /> conduct this concurrently with sampling at the Top Filling Station site (101 S. Wilson Way) <br /> and the ARCO site (130 S. Wilson Way). A Site Conceptual Model incorporating data from <br /> each of the three sites is in preparation and will be submitted to your office. Repairs to the <br /> thermal oxidizer will be made. Installation of proposed deep monitoring well MW17C is <br /> scheduled for the first quarter. <br /> If you have any questions or comments regarding this report, please contact us at your earliest <br /> convenience. <br /> Respectfully, <br /> Ground Zero Analysis, Inc. <br /> J, uooc, <br /> Joseph L. Vasquez, <br /> Staff Geologist cMP <br /> Jsrmt <br /> WSW �r <br /> Gregory P. Stahl, PG 5023 <br /> CA Certified Hydrogeologist No. 264 Of CA <br /> Attachments <br /> cc: Mr. Carl Knowles <br /> Mr. Pat Riddle, Esq., Law Offices of Patrick D. Riddle <br /> Mr. James L.L.Barton, RWQCB Sacramento <br /> Mr. Mohammed Asghar <br /> Mr. Jay Johnson, Stratus Environmental <br /> Mr. Tim Cuellar, Advanced GeoEnvironmental <br /> G:IG RO[JNDJEIROEKIQMR12005%q m2005.d oc <br />