Document ID: EPA-HQ-OW-2008-0667-3644
Agency: epa
Document Type: Supporting & Related Material
Title: 
Posted Date: 2014-08-15T04:00Z

316(b) RULE
                                 TELEPHONE LOG

Name of Caller: 	John Sunda, Tetra Tech
Date: 	May 24, 2012
Company Name: 	Ovivo (formerly Eimco)
Person Contacted:	Trent Gathright
Title:	Sales Manager		
Telephone #:	281-480-7955
Email:	trent.gathright@ovivowater.com
Called to inquire about the relative costs between conventional through flow traveling screens and similar screens with modified Ristroph features.  Ovivo (formerly Eimco) is an equipment vendor for traveling screens and other technologies.
Assuming that the mesh size is the same (e.g., 3/8 inch coarse mesh), then the difference in costs will be roughly 24% to 26% for screens where the original debris return trough is on the downstream (descending) side of the screen. If the original debris return trough is on the upstream (ascending) side, then a taller screen will be necessary and the difference in costs will be around 30%. Mr. Gathright said about 30% to 45% of existing screens have the debris trough on the upstream side. These costs apply to the traveling screen and adjacent fish return and debris troughs and do not include the combined fish return leading away from the screens or additional spray washwater pumps which are the responsibility of the owners.