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Plans (227) 2c J -U -B ENGINEERS, Inc. (J • U • B , ENGINEERS • SURVEYORS • PLANNERS 2810 W. Clearwater Avenue, Suite 201 —/ Kennewick, WA 99336 509 - 783 -2144 FAX: 509- 736 -0790 January 28, 1999 Mr. Jim Bryan Sconzo /Hallstrom Architects 919 -124 Avenue NE, #101 Bellevue, WA 98005 RE: EAGLE HARDWARE AND GARDEN #425 - TIGARD, OR Dear Jim: We have reviewed and revised the on -site civil plans per City of Tigard comments dated December 4, 1999 from Jim Funk. The items that we addressed per Jim Funk's letter are as follows: SITEWORK I) '1(\Q v. Michael Robinson has talked to Jim Funk about providing a recorded document describing the site as one parcel. Per their conversation, this item is no longer applicable. v2. The total impervious area minus the existing impervious area is 289,238 square feet (6.64 acres). This includes roofs, sidewalks, and parking lots. Additional storm drainage calculations were provided to Brian Rager, City of Tigard, for his review. t /3. From our calculations, the amount of excavation for the site is 39,976 cubic yards and embankment is 130,623 cubic yards. This information is provided on sheet C5/9. a. Water Quality Facility observation notes have been added to sheet C1 /9. 1 ,-6. We have contacted and coordinated with Stewart Davis, Tualatin Valley Water District. We are currently in the process of determining the meter fees and system development charges. ofX + ►, N °. The on -site storm drainage piping calculations have been prepared and are enclosed for review. Bob • s, City of Tigard, stated that we do not need to submit two additional stamped plans for storm drainage piping review. The three sets of plans to be submitted for review shall be sufficient. V‘. On -site storm drainage calculations have already been provided to Brian R er, City of Tigard, for his review. Storm Drainage Manhole A has been changed to a 2" diamete flow control manhole. The detail is provided on sheet C9/9. Calculation control are included in the storm drainage calculations provided to Brian Rager. The outfall piping has been sized and the calculations are enclosed for review. "/7c. Retaining wall drainage has been addressed. The information is located on sheet C5- C6/9. A 4" diameter perforated pipe behind retaining walls was recommended by the geotechnical engineer and is stated in the geotechnical report. ,X3. Roof drain lines connecting to the storm drainage main are not over 100 feet in length, thus do not require a cleanout. The main storm drainage piping system uses manholes not more than 400 feet in length. The storm drainage pipe network can be easily accessed through the manholes for maintenance. , Per the United Sewerage Agency Design IX Standards, the maximum distance between storm drainage manholes is 500 feet. Lynch - type catch basins have been detailed on sheet C8/9. 12988-01/Bryan 1- 27- 99.doc �� --- r J -V-B 1 Mr.Bryan Engineers Surveyors Planners Page 2 t • I'10. The installation of the domestic water from the meter and the backflow prevention device to be installed, inspected, and tested in accordance with NFPA 13 has been noted on sheet C1/9. C91 . Fire flow testing for the proposed fire loop shall be tested using the fire flow test form provided by the City of Tigard. v1 b. The Fire Flow Work Sheet has been completed and is enclosed for review. ACCESSIBILITY . a) These detectable warnings have been provided on the architect's plans. /b. Handrails have been provided in these areas. - ) Accessible parking symbols /signage have been provided. . This is a future building pad and is not to be constructed at this time. 1 o 0 Accessible routes to the public way have been provided. • I FIRE AND LIFE SAFETY The FDC has been shown on sheet C4/9 and in more detail on the Fire Protection Plans esigned by TVA STRUCTURAL T 1 Further g otechnicat'in a tigations re being conducted at this time for design of the retaining walls along theSR2:17- -right -of way. Keystone calculations are currently being designed and will be submitted to the city in approximately two weeks. Same as above. All plans exce t for C9/9 have been stamped and dated by a State of Oregon licensed en ineer. heet C9/9 ll be stamped once the additional geotechnical study is _ 01 complete . Sincerely, J -U -B ENGINEERS, INC. Darral S. Moore, E.I.T. Assistant Engineer enc: Reproducible On -Site Civil Plans C1 -9 On -Site Pipe Sizing Calculations Fire Flow Work Sheet On -Site Concrete Retaining Wall Calculations . c:. Jim Bryan - Sconzo /Hallstrom Architects 12988 -01 /Bryan 1- 27- 99.doc