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18 November 1991 <br /> (GeoAudit CV 43C4-1. 1) <br /> Page 2 of 2 <br /> Upon further decrease of OV to approximately 50 ppm as isobutylene, <br /> or 500 ppm as hexane, additional vapor extraction from MW-1 is <br /> planned. The contamination at this well is assumed to be restricted <br /> to the perforated casing and this well design appears to allow an <br /> effective venting from this well. Hydrocarbon laden vapor from this <br /> well is expected to increase the concentration of OV. <br /> In summary, the compiled data indicates a good venting progress of <br /> the contaminated soil. <br /> Please contact our office if you have any questions. <br /> Sincerely, a Ep�pc <br /> GEOLOGICAL AUDIT SERVICES, INC. <br /> c Moro <br /> w <br /> D DP CA�� <br /> Bob Marty Joshua Ong, Ph.D. <br /> Staff Geologist Senior Project Hyd geologist <br /> Registered Geologist No. 4725 <br /> Enclosures <br /> cc: Ms. Edna Rolleri <br /> Mrs. Donna Bruno <br /> • <br />