Upload
others
View
1
Download
0
Embed Size (px)
Citation preview
March 23, 2020
Ms. Staci Orr Gardner
DWSRF Loan Program Administrator
100 North Senate Avenue
Room 1275
Indianapolis, Indiana 46204
Re: SRF Loan No. DW 17 07 16 03
Request for Waiver of American Iron & Steel Requirements for 6-inch Backflow
Preventer
Greensburg New Surface Water Treatment Plant
City of Greensburg, Indiana
Dear Ms. Gardner:
The City of Greensburg is requesting a product specific project waiver of American Iron &
Steel (AIS) requirements be issued for one (1) 6-inch backflow preventer (double check
valve) for the construction of the City of Greensburg New Surface Water Treatment Plant
Project. In accordance with the United States Environmental Protection Agency (USEPA)
memorandum, Implementation of American Iron and Steel provisions of P.L. 113-76,
Consolidated Appropriations Act, 2014, the information required for a waiver is included in
the following paragraphs and in the enclosed documents.
The project includes the installation of one (1) backflow preventer for cross contamination
protection. The backflow preventer will be installed where potable water piping is connected
to sludge draw-off lines for two solids-contact clarifiers. Potable water is used to flush the
draw-off lines and clarifier sumps back into the clarifier tanks to maintain proper operation of
the clarifiers.
General Information:
Description of materials: 6-inch double check valve backflow preventer made of foreign-
sourced materials including epoxy-coated cast iron valve bodies and stainless steel seats.
Unit of Measure: One (1) Each
Quantity: One (1)
Location of project: 1105 N Ireland Street, Greensburg, IN 47240
Name and address of supplier: Watts, 815 Chestnut Street, North Andover, MA 01845-6098
Justification: No AIS compliant double check valve backflow preventers are made.
Availability Waiver Request:
Supplier information: See General Information above.
Documentation of efforts: Contractor Wilhelm went directly to one of two specified
manufacturers. Please refer to page 2 of the enclosed documents for a letter from the
manufacturer. The City’s design engineer HNTB conducted limited research to find a
compliant product but was unable to find one. Additionally, HNTB’s research on EPA’s
website indicates that product specific project waivers have been granted in the past for this
type of product due to lack of availability.
Project schedule:
Backflow preventer review and approval: Immediately after waiver approval;
Product delivery: Approximately two (2) weeks after approved submittal;
Project completion: January 2022. Please refer to pages 3 through 12 of the enclosed
documents for the complete project schedule.
Relevant excerpts: Please refer to page 13 of the enclosed documents for relevant plan sheet
showing the quantity and quality of construction materials required.
Based on the above and the enclosed documents, the City of Greensburg requests a product
specific project waiver for the 6-inch backflow preventer. Should you have any questions or
comments pertaining to waiver request, please contact our consulting engineer HNTB
Corporation, Mr. Darren C. Burkhart, at (317) 636-4682. Thank you in advance for your
consideration of this matter.
Sincerely,
THE CITY OF GREENSBURG
Joshua Marsh
Mayor, City of Greensburg
JM/sal
Enclosure
cc: Mr. Rick Denney, Greensburg WTP Superintendent
Ms. Donna Lecher, Greensburg Water Office Manager
Mr. Darren Burkhart, HNTB Corporation
Mr. Derek Carlson, F.A. Wilhelm Construction
Page 2 of 2
FOUNDATION934.50'
HUB LEVEL936.92'
TOP OF WALL956.38'
B
3M2
SOLIDS CONTACTCLARIFIER MECHANISM1 SPEC. SEC. 46 43 53
EFFLUENT LAUNDERS
INFLUENT PIPE
EFFLUENT TROUGH
8" D.I. SLUDGEDRAWOFF LINE
E
3M3
14" D.I. POTABLEWATER LINE
FOUNDATION934.50'
HUB LEVEL936.92'
TOP OF WALL956.38'
RAPID MIX FLOOR930.80'
RAPID MIX TOP938.80'
C
3M2
MAX. EL. 954.88'
EFFLUENT LAUNDERS
INFLUENT PIPE
CONNECTION AND ELEVATION TO BE COORDINATED WITH EQUIPENT MANUFACTURER
ALUM. HANDRAIL (TYP.)
8" D.I. SLUDGEDRAWOFF LINE
GV-SCC1-1
18" D.I. CLARIFIERINFLUENT
SOLIDS CONTACTCLARIFIER MECHANISM1 SPEC. SEC. 46 43 53
EFFLUENT TROUGH BEYOND
18" D.I. CLARIFIER INFLUENTTO BE HEAT TRACED ANDINSULATED TO 3' BELOWGRADE
18" STATIC MIXER
1' - 0"
BY MANUFACTURER BY CONTRACTOR
CHEMICAL FEED LINE TO BE HEAT TRACED AND INSULATED TO 3' BELOW GRADE
1' - 0"
4
3M3●
GR
AD
E
2' -
0"
1" PVC SAMPLE LINE (x5)
TOP OF WALL956.38'
RAPID MIX TOP938.80'
18" D.I. CLARIFIEREFFLUENT TO BE HEATTRACED AND INSULATEDTO 3' BELOW GRADE
EFFLUENT TROUGH
C
3M2
8"x8"x6"TEE
PV-SCC1-2
6"x6"x6"TEE
PV-SCC2-2
8"x8"x6"TEE
8" D.I. SLUDGEDRAWOFF LINEFROM CLARIFIER 2
8" D.I. SLUDGEDRAWOFF LINEFROM CLARIFIER 1
PV-SCC2-1
PV-SCC1-1
6" D.I. POTABLEWATER LINE
6" BACKFLOW PREVENTER
24" D.I. RAW WATERLINE
GV-SCC-1
GV-SCC-2
9' -
0"
11' - 0"
8"x8"x8"TEE
SLOPE
SLO
PE
SLOPE FLOOR WITH GROUT. MAX. 3" THICKNESS
SCALE VERIFICATION
BAR IS ONE INCH LONG ONORIGINAL 22" X 34" DRAWING
IF NOT ONE INCH ONTHIS SHEET, ADJUST
SCALES ACCORDINGLY
DESIGNER
DRAFTING
PROJ. ENGR.
PROJ. MGR.
JOB NUMBER
DATE
SHEET NO.
DATE
BY HNTB CORPORATION
111 Monument Circle, Indianapolis, Indiana 46204-5178
PL
OT
DA
TE
:
CITY OF GREENSBURG, INDIANA
NEW SURFACE WATER TREATMENT PLANT
3/1/2019
HNTB
IND
W0
0\2
89P
RO
JE
CT
S\6
84
86
_G
ree
nsbu
rg_
WT
P\C
AD
D
6/1
3/2
019 1
2:0
5:1
9 P
M
N:\6
84
86_
Gre
en
sb
urg
_W
TP
\CA
DD
\Are
a 3
\Are
a 3
Gb
urg
HN
TB
201
8.2
_C
EN
TR
AL.r
vt
K. HOLZHAUSEN
K. HOLZHAUSEN68486-DS-001
S. LORD
D. BURKHART
CLARIFIER SECTIONS AND SLUDGE VAULT PLAN
M 2
3
3/1/2019
SCALE: 1/4" = 1'-0"
3M1
CSECTION
SCALE: 1/4" = 1'-0"
3M1
BSECTION
SCALE: 3/8" = 1'-0"ASECTION
SCALE: 3/8" = 1'-0"
SLUDGE VAULT PLAN
NOTE: HEAT TRACE AND INSULATION REQUITRE FOR PIPING OUTSIDE OF CLARIFIER WALLS.
SEE 2C6 FOR CONTINUATION
SYMBOL REVISION DESCRIPTION BY DATE APPROVED
1 ADDENDUM NO. 5 TKR 4/4/2019 SAL
BACKFLOW PREVENTER SHALL BE WATTS LF709, ZURN-WILKINS 350A, OR ENGINEER-APPROVED EQUAL.
1
39
CONFORMED SET