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' 621 Engineering Inc. <br />Engineering for the 21st Century <br />Phone 303-991-6000 <br />Fax 303-991-6001 <br />2695 South Raritan Street <br />Englewood, Colorado 80110 <br />June 20, 2007 <br /> <br />NOV 2 0 2007 <br />Division of Reciamation, <br />Mining and Safety <br />Ms. Teresa Bennett <br />Hazardous Waste Corrective Action Unit, Compliance Program <br />Colorado Department of Public Health and Environment <br />4300 Cherry Creek Drive South <br />Denver, Colorado 80246-1530 <br />Subject: ADDENDUM TO THE INTEGRATED CORRECTIVE ACTION PLAN <br />Colorado Spill Incident No. 2006-1029 <br />Bayshore Pipeline Release <br />Firestone, Colorado <br />Dear Ms. Bennett: <br />Phone 888-628-1083 <br />Fax 888-628-1084 <br />E-21 Project No. 863 <br />On behalf of GeoCon / Environmental Barrier Company, E-21 Engineering, Inc. (E-21) is submitting this <br />Addendum to the Integrated Corrective Action Plan (ICAP) dated January 29, 2007 as requested in your <br />letter dated March 20, 2007. This addendum summarizes the results of soil excavation and disposal, <br />surface and groundwater characterization activities, remedial pilot testing results and proposed remedial <br />action plan along with other information requested in the above mentioned letter. <br />If you have any questions or require any additional information, please do not hesitate to call me on <br />my cell phone at 303-507-7484 at any hour or day or at my E-21 office at 303-991-6000. <br />Sincerely, <br />E-21 ENGINEERING, INC. <br />Sergius N. Hanson, P.G., P.E. <br />Senior Engineer and President <br />' attachments <br />41 J?? <br />Brian N. Woody, P.G. <br />Project Geologist