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Storm Drainage NarrativeFebruary 28, 2013 STOR IT TEN MILE Storm Drainage Narrative F■■ eta ad rant Consulting, Inc. General Proiect Description: The Ten Mile Stor-It project proposes the development of the remaining phases of an existing storage unit site located at 355 N Ten Mile Road in Meridian, Idaho. The project will develop the remainder of a 15.7 acre parcel with additional covered storage units and parking areas. The site is bounded by Ten Mile Road on the east, UPRR on the north, Ten Mile Church on the south and Silver Oaks to the west. Ten Mile Church and Silver Oaks are both undeveloped next to this site. Ten Mile Drain bisects the site and has had a License Agreement with N.M.I.D. in place since 1999. (Inst. #99016371) This License Agreement was for the storage units on the east side of the Ten Mile Drain. Under this agreement discharge pipes to the drain were allowed for storm water after the initial 85% of the 1 inch storm event were retained in on site storage swales. After the development of the east side, the owner purchased the additional property on the west side of the drain. In 2004 Ada County required a bridge across the Ten Mile Drain so it could be connected to the property on the east side. An addendum to the previous License Agreement was entered into for the placement of the bridge across the drain. (Inst. #104062974) Site Layout: At project completion the site will be almost complexly surrounded by buildings. As part of City of Meridian's conditions of approval, they have required the owner to construct a 10 foot wide pathway along the west side of the drain in NMID's easement. In the proposed site layout one of the existing storm drain retention swales previously constructed for the east side is to be removed and replaced by a seepage bed under the drive isle. The design proposes to pass the storm water of a small area of 9,143 SF to the existing outlet of the drain. This area's storm runoff equals 4% of the area that previously went to the retention swale. During a one inch storm event flow to 10md would be reduced from the 15% that was previously approved for discharge to 4%. A net reduction of 11 % for that area. Historically the properly on the west side was a cultivated field that was irrigated from a ditch along the west bank of the drain, irrigation water was fed from siphons and flowed westerly across the site. Since no runoff from the west side fields entered the drain, other than feeder ditch overflow, the west side properly has been designed to retain all storm water on site in seepage beds. Storm water drainage will be piped to sediment/oil traps before being discharged to the infiltration beds where it will be allowed to filter through a ASTM C-33 sand absorption medium. Infiltration Design: The storm water system has been designed to handle the 1 inch per hour event using the Rational Method. The soils investigation pits were excavate on 3/11/2008 and piezometers were installed which identified seasonal high ground water levels at between 9 and 10 feet bgs. The depth of the seepage beds have been set to maintain 3 feet of separation from the gravel storage zone and seasonal high groundwater and provide 12" of ASTM C-33 sand filtration at the bottom of the infiltration beds. See appendix for drainage calculations. 1904 W. Overland Rd. • Boise, ID 83705 • Phone (208) 342-0091 - Fax (208) 342-0092 • Internet: www.guadrant.cc Civil Engineering • Surveying Ten Mile Stor It Storm Drainage Narrative February 28, 2013 Page 2 of 2 F0 WE Quadrant Consulting, Inc. System Ownership: The on-site storm drainage system will be will the responsibility of the land owner, currently Avast Limited Partnership, for future maintenance. An Operations and Maintenance manual will be provide for the owners use in maintaining this system. STORMNARRATIVE-10M. 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