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Page 5 of 9 <br />E-21 Engineering, Inc. <br />2695 South Raritan Street <br />Englewood, Colorado 80110 <br />(303) 810-1002 cell <br />(303) 991-6000 office <br />(303) 991-6001 fax <br />brianwoodyl234@msn.com <br />-----Original Message----- <br />From: Sergius Hanson [mailto:serge@e-21engineering.com] <br />Sent: Thursday, January 11, 2007 4:23 PM <br />To: Warren Maierhofer -- Vertex; Chris Morley -- Vertex; Don D'Amato <br />Vertex; vinodjayaram@geocon.net; Brian Woody <br />Subject: FW: Bayshore Ponds Remediation <br />Gentlemen - <br />Here is the Colorado CDPHE e-mail approval of our proposed clean-up <br />for <br />the <br />Environmental Barrier near Firestone. This includes the status and <br />proposed <br />action summary e-mail sent to CDPHE by our environmental law <br />specialist, <br />Norm Higley. <br />Brian Woody will prepare a project status report e-mail to send to you <br />tomorrow along with an updated/ revised cost estimate for Task 4 for <br />your <br />comments, verbal approval and authorization to proceed. <br />Serge, E-21 <br />-----Original Message----- <br />' From: WALTER Avramenko [mailto:wavramen@cdphe.state.co.us] <br />Sent: Thursday, January 11, 2007 12:47 PM <br />To: Norm Higley <br />' Cc: 'Sergius Hanson' <br />Subject: Re: Benzene in <br />Dear Norm: <br />I'm comfortable allowing your client to proceed with the <br />implementation <br />' of this proposal in an effort to quickly stabilize and remove the <br />contaminated slurry. It appears as though the slurry and trench <br />sidewall mixture is no longer a hazardous waste (below the 20x TCLP <br />factor), the addition of the cement acting as a absorbent that makes <br />handling of the slurry easier during its removal. If testing confirms <br />that the stabilized mixture has benzene concentrations well below the <br />20x TCLP factor, further testing is not required. Please determine <br />6/9/2007