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Ms Rebecca Setliff { <br /> Page 4 of 4 <br /> i <br /> • EDB and 1,2-DCA appear to be associated with the onsite release, but are not laterally <br /> widespread The detection of 370 ppb 1,2-DCA in well MW14 indicates that the Top Filling <br /> plume also contains this compound <br /> VAPOR EXTRACTION SYSTEM ACTIVITIES <br /> VES Operation <br /> The soil vapor extraction system was not operated dunng the fourth quarter of 2001 pending <br /> direction from PHS/EHD regarding further operation of the system Confirmation borings <br /> sampled during the first quarter indicate that no significant vadose soil contamination remains <br /> RECOMMENDATIONS <br /> VES Operation <br /> As directed by PHS/EHD in a letter dated January 4, 2002, the vapor extraction system will be <br /> pulsed a few times during the next quarter The results will be evaluated to determine if <br /> additional operation of the system would have any appreciable benefit <br /> Quarterly Groundwater Monitoring and Sampling <br /> Groundwater monitoring and sampling for the first quarter will be conducted in February 2002 <br /> PHS/EHD will be notified 48 hours prior to conducting the quarterly fieldwork <br /> If you have any questions or comments regarding this quarterly monitoring and sampling report, <br /> please call at your convenience <br /> Respectfully, <br /> Grou Z Ana sis, Inc <br /> �S- - <br /> e Garvey, <br /> Sta eologist �-� <br /> /J GREGORY P. <br /> G� � STAHL <br /> ---, No 5023 <br /> Gregory P Stahl, RG 5023 <br /> CA Certified Hydrogeologist No 264 ATF OF CAUFO��� <br /> Attachments <br /> PC Mr Carl Knowles <br /> Mr Pat Riddle, Esq , Law Offices of Patrick D Riddle <br /> Mr Marty Hartzell, RWQCB Sacramento <br /> Mr Don Roek <br /> i <br /> roeklgmr14QM2001 <br />