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®r Applegate Group, Inc. Water Resource Advisors for the West April 7, 2015 Mr. Tyler O'Donnell Division of Reclamation, Mining and Safety 1313 Sherman Street, RM 215 Denver, CO 80203 ■ ECEIV ,CD QPr? 0 2015 DIVISION OF RECLAMATION, MINING FETY AND ,AFETY � RE: Brannan Sand & Gravel Company Pit 29, Permit No. M- 1980 -183, Response to Adequacy Review and First Amendment to AM -02 Dear Mr. O'Donnell: We are responding to you Preliminary Adequacy Review dated January 23, 2015. As we have explained in the past, the Einspahrs changed their mind about allowing Brannan to use their property for the French drain, which required us to re- configure the drain as described in our earlier submittal. That, together with our discussions with the landowner of Pit 29 and the landowner of the Stagecoach Pit, has resulted in a design that shifts the drain to the north on the Pit 29 property, followed by a crossing under Brighton Road and a continuation of the drain to the west along the northern boundary of the Stagecoach Pit property. The drain is designed to collect ground water on the east side of Brighton Road and release that ground water into the alluvium on the west side of Brighton Road. With this design change in mind, I will respond to the numbered items in your adequacy review in this letter. Attached is the First Amendment to AM -02. Where applicable, revisions requested in the Adequacy Review are part of the First Amendment and are noted. 1) The revised Application Form is attached. 2) The permit area north of 132nd Avenue has been added. See First Amendment. 3) See First Amendment. 4) Please see Exhibit E. As noted above, the drain is not designed to drain to the river. We believe it is sufficient, and preferable, to redirect the ground water back to the alluvium rather than discharge to the river. We propose to install a knockout in the event the drain, as designed, is not effective. 5) Plan and profile view of the French drain is shown on Exhibit E. 6) The flow in the pipe is calculated at 2.5 cfs. See attached output "Open Channel Pipe Flow ". 7) We propose to perform a TV survey once per 5 years. The need and type clean out will be based on the results of that survey. 7405 W. Highway 50, Suite 123 1490 W.12 V Avenue, Suite 100 118 W. 6`h Street, Suite 100 Salida, CO 81201 Denver, CO 80234 Glenwood Springs, CO 81601 303 -452 -6611 www.applegategroup.com