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r <br /> i <br /> I i <br /> Mr Nuel Henderson <br /> ` g Page 4 of 4 <br /> • <br /> RECOMMENDATIONS <br /> Groundwater Monitoring and Sampling <br /> Reduce the sampling frequency for wells that are monitoring the plume of contamination <br /> originating from the onsite release Given the massive quantity of historical groundwater <br /> monitoring and chemical analysis data at this site, quarterly monitoring and sampling for this <br /> site is not warranted Transfer ownership or sampling responsibility for the wells that are <br /> affected by the offsite release(s) to the appropriate responsible parties <br /> Vapor Extraction System Operation <br /> We recommend removing the vapor extraction/thermal oxidizer equipment from the site, but <br /> retaining the vapor wells and associated conveyance piping for possible resumption of vapor <br /> extraction in the future should water levels decrease significantly <br /> Fourth quarter groundwater sampling is scheduled to be conducted in November 2003 EHD <br /> will be notified 48 hours prior to conducting the quarterly fieldwork <br /> If you have any questions or comments regarding this report, please contact us at your <br /> convenience <br /> Respectfully, <br /> Gro d r nalysis, Inc <br /> rve <br /> Staff Geologist GREGOR P. � <br /> STOOL <br /> No. 5023 ` <br /> Gregory P Stahl, RG 5023 <br /> CA Certified Hydrogeologist No 264 CAl1i�� <br /> i <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 Don Roek <br /> Mr Mohammed Asghar <br /> Mr Jay Johnson, Stratus Environmental <br /> Mr Tim Cuellar, Advanced GeoEnvironmental <br /> i <br /> 11GZA FSIVOL ]1DATAIGROUNDZEIROEKIQMR12003\3gm2003 doc <br />