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Correspondence (2) FILE COPY City of Tigard, Oregon • 13125 SW Hall Blvd. • Tigard, OR 97223 October 23, 2006 TI €;G�ASRD Jones Masonry Inc. 1861 NW 8 Street McMinnville, OR 97218 RE: STORM DRAIN FOR NEW SINGLE FAMILY DWELLING Project Information Building Permit: MST2006 -00181 Construction Type: VN Address: 15083 SW 79 Avenue Occupancy Type: R -3 Area: 3,402 Sq Ft Stories: 2 This letter is in response to your request of an alternate method of construction for the storm drainage system at 15083 SW 79 Avenue. Per section 301.2 of the Oregon Plumbing Specialty Code, the design to daylight the storm drain system into a ditch that flows to the street is approved as an alternate method of construction provided the piping material is a schedule 40 or better. See attached letter and site IS ,. as reference. Respect / _Brian B Eck, '. ' Plans xamination Supervisor Phone: 503.639.4171 • Fax: 503.684.7297 • www.tigard- or.gov • TTY Relay: 503.684.2772 Jones Masonry Inc. 1861 NW 8 St. McMinnville, OR 97128 To: Building Official of Tigard This letter is in reference to a single family dwelling our company is building at the site address of 15083 SW 79 Ave in Tigard. We are writing you with intentions of revising our storm drain system we first submitted in our site plans. We first submitted our site plans with the idea of bringing the storm drain down the side of the subject property then across the driveway and down the neighboring property to the street. This was the approved way on our site plan for the storm drainage. The project is currently at the point where we have trenched down the side of the subject property to lay our utilities and drainage. After reevaluating our storm drain path and speaking with Hap and a few of the engineers we believe we have come up with a better design for the drainage. The engineer's have been more than helpful by coming out to the site and working with us to find the best route for our storm drainage. We don't believe that by cutting across the driveway and running the storm down the other side will be the most effective route. Our proposal is to run our storm down the side of the subject property with a minimum of 1% fall 12 inches below grade to point x, which will be between 40 or 50 feet from the street, where it daylights to a shallow pan ditch, burlap lined with 2" clean rock. The ditch will become shallower to the existing grade as you get closer to the street. We do feel this is the most effective and best method because the neighboring property has their storm drain day lighting at the street and it has never caused any problems. So with day lighting our drain so far from the street we see no future problems. We hope to have a quick response due to the fact that we would like to close our trenches and get our subs paid and down the road. Thank you. Jones Masoy c, I Contact # 503.560.1395 "Not to scale" t Drive Way Subject Property -EN min. 1% fall Trees . A / ,, . i Shallow pan ditch burlap lined with 2' clean rock *., _ Berm v 15083 SW 79th ANT v.- Rleusch Partition av Becomes shallower to v enstrig grade at the street .9th AVE.