My WebLink
|
Help
|
About
|
Sign Out
Home
Browse
Search
Item 4 - PH on MWMC Reg. SDCs
COE
>
City of Eugene
>
Council Agendas 2004
>
CCAgenda-06/14/04Mtg
>
Item 4 - PH on MWMC Reg. SDCs
Metadata
Thumbnails
Annotations
Entry Properties
Last modified
6/9/2010 1:10:03 PM
Creation date
6/10/2004 3:21:26 PM
Metadata
Fields
Template:
City Council
City_Council_Document_Type
Agenda Item Summary
CMO_Meeting_Date
6/14/2004
There are no annotations on this page.
Document management portal powered by Laserfiche WebLink 9 © 1998-2015
Laserfiche.
All rights reserved.
/
119
PDF
Print
Pages to print
Enter page numbers and/or page ranges separated by commas. For example, 1,3,5-12.
After downloading, print the document using a PDF reader (e.g. Adobe Reader).
View images
View plain text
SYSTEM DEVELOPMENT CHARGE METHODOLOGY <br /> <br />Collection System Pump Stations <br />The category collection system pump stations consist of pump stations that impart <br />additional head or pressure to the wastewater so that the flow is conveyed to the WPCF. An <br />example of such a facility is the Wilakenzie Pump Station. These regional pump stations <br />have the same functional and design criteria basis as the regional collection system <br />pipelines, and, therefore, the allocations are: <br /> <br />· Average Flow - 1/4 <br />· Peak Flow - 3/4 <br /> <br />Preliminary Treatment <br />Preliminary treatment facilities are located between the pump stations and primary <br />treatment, consisting of screenings and grit removal facilities. Minimal organic matter <br />(BOD) is removed during preliminary treatment. Also, solid materials removed during <br />preliminary treatment tend to be large and heavy in nature; these materials are not typically <br />considered a "suspended" material (or TSS). Consequently, the loading parameters of BOD <br />and TSS generally do not apply to preliminary treatment, and the unit process category is <br />entirely flow based. The functional and design criteria basis for preliminary treatment are <br />very similar to that of the collection system facilities, and, therefore, the allocation is <br />identical to the preceding categories. The split between average and peak flow is as follows: <br /> <br />· Average Flow - 1/4 <br />· Peak Flow - 3/4 <br /> <br />Primary Treatment <br />Primary treatment consists of the four, large, circular concrete basins (primary clarifiers) and <br />the associated equipment used to remove solids that settle to the bottom of the basins. The <br />purpose of primary treatment from a functional basis is to remove TSS and to a lesser <br />degree BOD. Typical percent removal across primary treatment for TSS and BOD are 60 and <br />30 percent, respectively. In other words, twice as much TSS is removed relative to BOD. <br /> <br /> For the design criteria basis, typical primary clarifiers sizing is governed by both average <br /> and peak flow, but for MWMC, where the parallel primary/secondary approach is <br /> proposed for peak flow management, the peak flow will be split between primary treatment <br /> and secondary treatment. Likewise, if the high-rate clarification peak flow management is <br /> ultimately implemented (because regulatory approval is not obtained for the parallel <br /> primary/secondary approach), the peak flow will be split between the primary treatment <br /> and the high-rate clarification. Therefore, only average flow is considered in the cost <br /> allocation. <br /> <br /> Combining the functional basis with the design criteria basis, the following allocation is for <br /> primary treatment: <br /> <br /> · Average Flow - 1/4 <br /> · BOD-1/4 <br /> · TSS- 1/2 <br /> <br /> SEA31003271388(DG).DOC/041040034 <br /> <br /> <br />
The URL can be used to link to this page
Your browser does not support the video tag.