07/13/2016 P&Z Packet - Laserfiche WebLink

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Ms. Katie Larsen July 6, 2016 Page 3 extension RCWD is requiring a wetland sequencing plan for the roadway alignment all the way to Cedar. The applicant is to work through the process with the RCWD. ENVIRONMENTAL The AUAR review was completed and comments are provided within a memo to Katie Larson dated June 28, 2016, enclosed. The items to be addressed: • A conservation easement shall be included on the south side of Clearwater Creek that is 150 feet in width a majority of the creek length and reducing down near the drive isle (east end); and on the north side of the creek it shall be 50 feet measured from the Top of Bank. • The development area is within an area with high potential for archeological sites. The applicant will need to complete a Phase I Archeological Survey. • Clearwater Creek is designated as a Public Ditch and the applicant should apply to RCWD for impacts to this ditch. WATER SYSTEM The proposed hydrant spacing exceeds 300 foot and should be revised. Fire hydrants shall be added along 21" Avenue from the existing watermain every 300 feet. These shall be located behind the future trail. The City's Deputy Director of Fire should review the final spacing. 2. The watermain loop around the building shall be 8 inch diameter and shall have valves every 600 to 800 feet. SANITARY SEWER SYSTEM The sanitary sewer crossing at Clearwater Creek casing pipe shall be detailed on the plans with the type and elevations. 2. The sanitary service cleanout needs to be labeled on the plans. STORM SEWER SYSTEM Storm pipe not meeting minimum grade for flushing (3fps) are as follows: 12" pipe between CB 216 and CBMH 215, 12" pipe between CBMH 211 and CBMH 2O9. (Sheet C2.2) 2. Storm pipe material (RC) not identified on plans. (Sheet C2.2) 3. The arch pipe crossing the proposed roadway should be identified as 122-inch Span Arch Pipe (this is the appropriate 96-inch diameter equivalent). 122-inch span arch apron on either side will need to have sheet piled end section and trash guard. (Sheet C3.1) K:\02988-200Wdmin\PIw Review 06-20-16\20160706 Engineering Review #2 United Properdes.d—