Report (16) Ls2 COs c 1 r \PNS -
r Black&Veatch Corporation
F4, BLACK&VEATCH 5885 Meadows Rd,Ste 700,Lake Oswego,OR 97035
P+1503 443-4467 E ClementsD2@bv.com
March 28,2018 gErFiVED
MAR 29 2.01b
Monica Bilodeau
iry
� ,#t,
City of Tigard
13125 SW Hall BlvdUULDiN' '`
Tigard,OR 97223
Dear Ms:Bilodeau:
This narrative serves to demonstrate that the Durham AWWTF Phase 5 Secondary Treatment
System Expansion project meets the City of Tigard's Development Code Chapter 18.630'Durham
Advanced Wastewater Treatment Facility PIan District'requirements.
This project is located wholly in the Operations Subdistrict,as defined in 18.630.020(B)(2)and
consists of a new aeration basin and secondary clarifier for wastewater treatment,a new electrical
building to house electrical gear for the new facilities,an extension of the plant's existing tunnel
system to provide below-grade maintenance access to process equipment,a new secondary effluent
channel for conveying treated wastewater,and other associated facilities.The facilities will
generally be constructed to the north and east of the existing treatment facilities. Refer to Exhibit A
This project extends the existing on-site sanitary sewer and stormwater infrastructure,with new
catch basins and inlets as required for new impervious areas.
The new facilities are all in the"Waste Related"and"Basic Utilities"Use Categories,which are
permitted uses within the Operations Subdistrict,under 18.630.030(B).
The project is not expected to produce any additional traffic,with the exception of temporary
construction traffic.
The following demonstrates how the project adheres to the specific requirements of 18.630:
18.630.040(A)(1) All above grade development is within the set back;meets requirements.
18.630.040(A)2) This project is not located in the Administrative Subdistrict.
18.630.040(A)(3) All development within set back is underground;meets requirements.
18.630.040(A)(4) No venting or odor control systems are located within the set back.
18.630.040(A)(5) None of the new facilities front a public road.
18.630.040(B)(1) This project is not located in the Administrative Subdistrict.
18.630.040(B)(2) Tallest structure is the Electrical Building at 18'—8"high. Meets
requirements.
18.630.040(B)(3) This project is not located in the Floodplain Subdistrict.
BUILDING A WORLD OF DIFFERENCE'
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March 28,2018 I Page 2
18.630.040(C) The project does not cover more than 75 percent of the Operations
Subdistrict.Accordingly,there is more than 25 percent landscaping. Refer to
Exhibit B.
18.630.040(D) There are no such structures in this project.
18.630.040(E) Signs shall meet requirements of the I-P Industrial Park Zoning District and
will be provided by CWS under separate permit;signs required during
construction will be posted by the contractor at the site.
18.630.040(F) This project meets the required minimum lot width.
18,630.050(A)(2) Existing landscape buffering will be restored under a separate project and
permit.
18.630.060(A) This project does not impact connectivity standards.
18.630.070(D) This project includes new noise-producing equipment,principally the odor
control fans.These fans will be provided with enclosures to limit their noise
to the levels outlined in Table 18.630.2
18,630.070(E) This project includes a new odor control system,which has been designed to
contain and treat potential odor sources arising from new development.
18.630.070(F) There are no components of this project that are expected to increase glare.
18.630.080 This project does not include any element that would require review under
18.740,Conditional Use.
Very truly yours,
Black&Veatch
Corpora ion
"kada'
Dave Clements,P.E.
Engineering Manager
dac
Enclosure(s)
cc: Sean Goris,P.E.,Black&Veatch
Dan Garbely,P.E.,Clean Water Services