
                                  MEMORANDUM


Tetra Tech, Inc.
10306 Eaton Place, Suite 340
Fairfax, VA 22030
phone	703-385-6000
fax	703-385-6007


DATE: 		December 5, 2008

TO:			Paul Shriner and Jan Matuszko, EPA
	
FROM:		John Sunda, SAIC and Kelly Meadows, Tetra Tech

SUBJECT:	Estimation of 316(b) Phase II Facility Intake Screen Type Usage

This memorandum summarizes the distribution of Phase II facilities by cooling water intake technology type and waterbody type.  It also provides a breakdown of the number of Phase II facilities with Ristroph and Ristroph-type traveling screens by EPA Region as well as a summary of the type of screen used by facilities located on the Mississippi and Missouri Rivers and associated tributaries.  This data is derived from both the short technical survey and the detailed technical survey. 

Table 1 presents the distribution of Phase II facilities using specific intake technologies by waterbody type. The number of facilities are estimated based on data provided in both the short technical survey and detailed technical survey which are then extrapolated to a total of 536 Phase II facilities using facility-specific sample-weighting factors.


Table 1. Distribution of Phase II Facilities by Intake Technology and Waterbody Type

Source: EPA 2000.



Data regarding the use of specific types of screening technology is only available for the 227 facilities that completed the detailed technical survey.  Since the survey was conducted, 7 of these facilities have ceased operation and therefore are not included in these data summaries.  Of the 220 currently operating Phase II facilities that completed the detailed questionnaire:

 7 facilities reported using wedgewire screens
 6 facilities specifically reported "Ristroph" traveling screens; 7 additional facilities may qualify as having "Ristroph-type" traveling screens
 22 facilities reported having "Fish Buckets, Baskets, or Trays"
 22 facilities have a through-screen screen velocity of <= 0.5 fps

The above facility counts include facilities with at least one intake that met the criteria described. Data may not apply to all intakes at a facility.
 
Table 2 presents a geographical distribution by state and EPA Region of the 13 facilities with Ristroph and Ristroph-type screens.

Table 2. Geographical Distribution of Facilities with Ristroph-Type Traveling Screens
EPA Region 
                                  Screen Type
                                     State
1




                                   Ristroph
                                      CT

                                 Ristroph-type
                                      CT

                                 Ristroph-type
                                      MA

                                 Ristroph-type
                                      MA

                                   Ristroph
                                      RI
2

                                   Ristroph
                                      NJ

                                 Ristroph-type
                                      NY
3
                                   Ristroph
                                      VA
6


                                 Ristroph-type
                                      LA

                                   Ristroph
                                      NM

                                 Ristroph-type
                                      TX
7
                                 Ristroph-type
                                      IA
9
                                   Ristroph
                                      HI
					Source: EPA 2000

Table 3 presents a summary of the type of screen technology used by facilities that withdraw water from the Mississippi River, Missouri River, and major tributaries that completed the detailed technical survey.  The list does not include intakes that use recirculating cooling systems.

Table 3. Summary of Screen Type Used by Facilities on the Mississippi and Missouri Rivers and Major Tributaries
                                     River
                            Screen Technology Type
                                       
                             Horizontal Traveling
                              Vertical Traveling
                                   Dual Flow
                                       
                                    Intakes
                                  Facilities
                                    Intakes
                                  Facilities
                                    Intakes
                                  Facilities
                                  Mississippi
                                      15
                                       6
                                       8
                                       6
                                       0
                                       0
                                   Missouri 
                                       1
                                       1
                                       8
                                       5
                                       1
                                       1
                                     Ohio
                                       0
                                       0
                                      16
                                       9
                                       0
                                       0
                                    Wabash
                                       0
                                       0
                                       2
                                       2
                                       0
                                       0
                                   Arkansas
                                       0
                                       0
                                       1
                                       1
                                       0
                                       0
                                   Illinois
                                       0
                                       0
                                       1
                                       1
                                       0
                                       0
                                     Total
                                      16
                                       7
                                      36
                                      24
                                       1
                                       1
Source: EPA 2000



References

U.S. Environmental Protection Agency (U.S. EPA). 2000. Section 316(b) Industry Survey. Detailed Industry Questionnaire: Phase II Cooling Water Intake Structures and Industry Short Technical Questionnaire: Phase II Cooling Water Intake Structures, January, 2000 (OMB Control Number 2040-0213). Industry Screener Questionnaire: Phase I Cooling Water Intake Structures, January, 1999 (OMB Control Number 2040-0203).

