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John W. Hickenlooper, Governor <br />Christopher E. Urbina, MD, MPH <br />ExecOve Director and Chief Medical Officer <br />Dedicated to protecting and lrnprovhV the health and enviroMnent of the people of Colorado <br />4300 Cherry Crook Dr. S. <br />Denver, Colorado 8M46-1530 <br />Phone (303) 692-2000 <br />Located in GlorKlale, Colorado <br />hftvJN#ww.cdphe. state.co, us <br />February 4, 2013 <br />Laboratory Services DIvIs4n <br />8100 Lowry Blvd. <br />Denver, Colorado 80230-6M <br />(303) 692-3090 <br />Mr. Craig Tessmer <br />Enviromnental Analyst <br />Adams County Planning and <br />Development Department <br />4430 South Adams County Parkway <br />I st Floor, Suite W2000A <br />Brighton, CO 80601 <br />RE: Backfilling Debetz Pit With Pipeline Trench Excavation Spoils <br />Mr. Tessmer, <br />1-9=10"= <br />The Hazardous Materials and Waste Managelnent Division ("the Division "} of the Colorado Department <br />of Public Health and En-viromnent appreciateis the opportunity to review the PAR 1088.- Northern <br />Treatment Plant Program HAZ,4RDOUS I <br />ERIALS ASSESSMENT FOR PROGRAM PIPELINES <br />( "the Hazardous Materials Assessmenf') sub itted to the Division on November 19, 2012. The <br />Division performed a technical and regulatory review to determine the applicability of the Rules <br />Pertaining to Solid Waste Sites and Facilities 6 CCR 1007-2, Part 1 ("the Solid Waste Regulations") to <br />the reuse of spoils generated while excavatiq the trench for interceptor pipeline for the Northern <br />Wastewater Treatment Facility. <br />As stated in an Adams County email to the Division on November 19, 2012, "Metro Wastewater <br />Reclamation District will begin construction I pf their new Northern Wastewater Treatment Facility in <br />2013, which will include an interceptor pipeline running from 128d' and Riverdale Road to 168' and [the <br />South Platte] River. The pipeline excavation will generate approximately 70,000 cu yd of spoils." <br />Adams County requested to use these spoils to partially fill the Debetz Pit, which is a former gravel pit <br />operated by Adams County. The email sent #o from Adams County to the Division on November 19, <br />2012 included the Hazardous Materials Assessment.. <br />The Hazardous Materials Assessment included a Phase I and Phase 11 Environmental Assessment that <br />documented potential sources of contarninatibn that could have impacted the spoils and provided <br />analytical test results of areas most likely to exceed the Colorado Soil Evaluation Values for unrestricted <br />use. Based upon the review of the Hazardo Materials Assessment, the Division has determined that <br />the excess spoils generated during the trenc, excavation for the interceptor pipeline are not impacted by <br />contamination and will meet the Solid Wast Regulations' definition of "environmental media." <br />