HomeMy Public PortalAbout333124Metropolitan
St. Louis Sewer
District
2350 Market Street
St. Louis, MO 63103-2555
(314) 768-6200
July 15, 2009
Mark B. Joersz
ADS/Hancor Inc.
4640 Trueman Blvd.
Hilliard, OH 43026
RE: Renewed Approval for the ADS Water Quality Unit
Dear Mr. Joersz,
This letter is to advise you the Metropolitan St. Louis Sewer District has renewed
the provisional use level approval to the ADS/Hancor Inc. — Water Quality Unit to
provide Pretreatment for other offline BMP's in accordance with District
requirements. This device will not be considered for pretreatment to online
applications such as ponds. This device is provisionally approved only, and for
all installations the project's design engineer must select the appropriate size unit
based on the attached table and be specific to the water quality flow rate for that
project.
The initial installation of the ADS/Hancor Inc. — Water Quality Unit, within MSD's
jurisdictional areas, shall include the following:
1) A manufacturer's or vendor's representative must be onsite during the
proprietary BMP installation to ensure the product's installation
requirements are met.
2) Shop drawings indicating elevations of flowlines, weirs, pipe inverts, etc.
will be required prior to installation.
3) The manufacturer or vendor must arrange for an as -built survey of the
proprietary BMP to be performed by a Missouri -registered Professional
Land Surveyor once the device has been installed, and prior to any testing
or monitoring.
4) The manufacturer or vendor must perform quarterly inspections of the
proprietary BMP during its' first year of operation, which will include visual
inspections and quantitative analysis of the service's sediment removal
efficiency, especially as compared to its design efficiency. MSD requests
to be invited to these inspections to further enhance familiarity and
understanding of the device.
5) Formal reports shall be submitted to MSD, including as-builts and at each
quarterly inspection. The reports shall include summaries, quantitative
analysis mentioned in item 4, photographs of the structure, inlet, internal
conditions of the structure, outfall conditions, etc. The reports shall also
evaluate the performance of the owner's adherence to the approved
maintenance program, and offer suggestions for any areas of
improvement.
Provisional use level approval is only granted for a period of one (1) year from
the date of this letter. MSD reserves the ability to withdraw or modify this
approval based on subsequent information, including information indicating that
this BMP does not satisfy MSD rules, requirements, or construction
specifications.
If you have any questions, please do not hesitate to contact me at (314) 768-
2772.
Sincerely,
Michael T. Buechter, PE
Principal Engineer
Engineering/ Design
pc: BMP Committee
Water Quality Product Numbers
Product
Number
Diameter
Length
Inlet
Size
Outlet
Size
Treated
Flow Rate
Sediment
Volume
Oil
Volume
Sieve
in
(mm)
ft
(mm)
in
(mm)
in
(mm)
cfs
(L/s)
ft3
(m3)
ft3
(m3)
Size
3620WQA
36
(900)
20
(6)
10
(250)
10
(250)
1.5
(42)
65
(1.8)
30
(0.8)
140
3640WQA
36
(900)
40
(12)
10
(250)
10
(250)
2.38
(67)
137
(3.9)
63
(1.8)
140
3620WQB
36
(900)
20
(6)
10
(250)
10
(350)
0.7
(20)
65
(1.8)
30
(0.8)
200
3640WQB
36
(900)
40
(12)
10
(250)
10
(250)
1.6
(45)
137
(3.9)
63
(1.8)
200
4220WQA
42
(1050)
20
(6)
12
(300)
12
(300)
1.75
(49)
83
(2.3)
38
(1.1)
140
4240WQA
42
(1050)
40
(12)
12
(300)
12
(300)
3.66
(104)
175
(5.0)
81
(2.3)
140
4220WQB
42
(1050)
20
(6)
12
(300)
12
(300)
0.86
(24)
83
(2.3)
38
(1.1)
200
4240WQB
42
(1050)
40
(12)
12
(300)
12
(300)
1.83
(52)
175
(5.0)
81
(2.3)
200
4820WQA
48
(1200)
20
(6)
12
(300)
12
(300)
2.26
(64)
116
(3.3)
55
(1.6)
140
4840WQA
48
(1200)
40
(12)
12
(300)
12
(300)
3.94
(112)
245
(6.9)
115
(3.3)
140
4820WQB
48
(1200)
20
(6)
12
(300)
12
(300)
1.13
(32)
116
(3.3)
55
(1.6)
200
4840WQB
48
(1200)
40
(12)
12
(300)
12
(300)
2.39
(68)
245
(6.9)
115
(3.3)
200
6020WQA
60
(1500)
20
(6)
15
(375)
15
(375)
2.95
(84)
183
(5.2)
87
(2.5)
140
6040WQA
60
(1500)
40
(12)
15
(375)
15
(375)
6.23
(176)
385
(10.9)
184
(5.2)
140
6020WQB
60
(1500)
20
(6)
15
(375)
15
(375)
1.47
(42)
183
(5.2)
87
(2.5)
200
6040WQB
60
(1500)
40
(12)
15
(375)
15
(375)
3.12
(88)
385
(10.9)
184
(5.2)
200
*140 sieve is equal to a particle size of 0.0042" (106 microns)
*200 sieve is equal to a particle size of 0.0030" ( 75 microns)