StormTech System.pdf
HiAll,
As requested, the following two concepts are being discussed with the City and ultimately with the contractor to see
which one is more in line with the project budget and can be accomplished in a timely matter. The attached concept
shows sheet piling being proposed which will be terminated at the designated height needed to achieve a 2’ freeboard
along the alignment highlighted in RED. -
The other concept which we discussed on the phone will entail using a light weight storm chamber (see attachment)
fastened to a 4x8 plywood sheeting, attached together, with a geotextile fabric along the back side to follow the same
alignment as the sheet piling option. It will be placed directly on the existing lime sludge in front of the disposal area for
separation. .
Please review, let me know if you have any questions and we can further discuss on Monday.
Thanks.
Samir F. Matta, pe
Sentor Project Manager
fn, & hogkuod, Andrews
Nowra &Newnam, Inc.
KCEO A OALY COMPANY.
2121 University Park Dr, Suite 100 » Okemos, MI 48864-6901
T 517.203.5437 517.203.5437 C 517.819.2367
www.lan-Inc.com «
[email protected]
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Flint WTP Improvements
Bray Road Lime Sludge Lagoon
MDEQ Comments
March 21,2014 -
The placement of the proposed liner and berm fails to establish
physical separation between the lime sludge collection area and
concrete fill area. For complete separation of these areas, the
berm needs to be constructed down to native soil.
As proposed, this appears to constitute the first step towards a
“cap-in-place” of the existing materials. If waste is left in place
within the berm, the city will be required to construct the berm to
meet Part 115 cap requirements. In addition, long term
groundwater monitoring, financial assurance, closure and post
closure plans will be required.
Please provide a residuals management plan for the lime sludge
collection area. In additional to removal of new lime sludge
produced, the plan must also include the gradual removal of
existing lime sludge: :
The working depth of the lime siudge collection area does not
appear to meet 10-States Standard’s minimum depth of 5 feet.
The available volume appears to be 60,000 cubic yards based on
2.6 feet of working depth. Please confirm this. What is the
surface area of the lagoon? Please provide a basis of design that
includes the amount of lime sludge produced at average day .
demand and the available days of storage at this production rate.
These parameters will need to be used towards developing the
residuals management plan. Finally, an acceptable residuals
management plan is needed for us to considera deviation from
the 10-State Standards guidelines.
An effluent sampling point needs to be provided for decant water.
n
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(3 MYA “as CACO, | : 4 mod ane, Biz
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LSB Jb Ae rray el BASIS OF DESIGN @ es
; * BRAY ROAD LIME SLUDGE DECANT WATER TREATMENT SYSTEM
/o Gheles T Attest IME U/ (be (4 KOA vasP CITY OF FLINT ; .
Te . ‘ ° 3
1, GENERAL DATA : ASSES p
Setey The City of Flint (City) proposes to use the existing lime sludge storage lagoon facility at Bray Road -
_ for the next 2.5 years on a continuous basis while the Karegnondi Water Authority (KWA) water
-7FAK WM 6D *% QeoG. homniveh _ SFA system is being constructed. After which, the facility will only be used should the Flint WTP have
Vero . to treat Flint River water on an emergency basis. In order to maximize storage volume of the
basa on SEF 4 eft . facility, the City proposes to construct a decant tower structure, pump station and forcemain to
. transport the decanted ‘water from the lagoon to a nearby sanitary sewer for final disposal. A CO,
feed system is also proposed to neutralize the high pH decant waste stream prior to pumping to the
(we hove ; 2-6 er cagA —_— | q A sanitary sewer.
The existing lime sludge storage lagoon facility at Bray Road does not have multiple cells; ; :
therefore, the sludge will be continuously weited and will only consolidate to approximately 25% i
solids. The lime sludge and decant waste stream flows are summarized in the table below: . i
Lime Sludge Quantities Summary
SA> 8 30,50 ey WTP Flow Sludge Produced’ Sludge Stored Decant Waste Decant Waste &. 1G Nor aL / Bb Ses
& te “
. [MGD] (3% Solids) < (25% Solids) to Sewer to Sewer ~
Isp). Icy/day] gpd (gpm <s a |
Ream : [Se VA ; Average Day : nse 92,000 : 5! a 80,700 56 |
J Current Max Day 8 165,000 eS 145,200 100 4
Prop. Max Day . 24 220,000 , 131 193,600 - 135 “a bere vt _ Go> DAS
“FAL 1069 K (SOx ‘ - v4 Oey — , /
al 2. CO, FEED SYSTEM fe tery “te hf, AS yb-t
. &* A4/ ate i
i
; 4 ; a. Process Description :
ears , A gaseous carbon dioxide feed system will be installed .on the Bray Road site near i
Lax :
the decant pump station. The system will include a liquid storage.tank, vaporizer, :
zg (> vapor heater, pressure regulator, pH control panel and a gas diffuser. Liquid CO, i
es [+ ‘\ t will be stored in a 6-ton tank and regulated through a vaporizer. The gaseous CO,
: pelt will be sent through diffuser piping and released into the decant tower through two
VALE gd: is > olin (2) 7” diameter disk ceramic diffusers. A pH probe will be located in the decant
= ° . tower to monitor pH downstream. of the CO, injection point. The pH probe will
‘ transmit the pH reading to the pH control panel, which will regulate the CO, feed ‘
@ 156 — sy (534 ay /D A/ 4 ; : rate for set point control of the pH in the decant water waste stream. i
13/ AND . eos
“ Ly mgd —S : b. Design Criteria
gste ! 157 geet : |
| Lag 7 * Max CO, feed — 200 mg/L . . ,
. ‘ ° Max decant flow rate — 140 gpm
[-25 f , / sp! \
@ tb ngd =— \
bowe yh = ABATE ak [ye
[at SE /DK/ AgL Saf & .
xxxEND_PAGE:deq09_b3_109_205_94
1
° CO, feed system capacity @ Max Day (140 gpm)
140gpm_ 8.341b
Fae ered * 200ppm C02 rn 336 lb/day
. CO, feed system capacity @ Average Day (60 gpm)
60 : b
San gH + 200ppm CO, * = 144 lb/day
94-4 GD
. CO, storage for minimum 30 days at Average Day per 10 States Standards
1442» 30 days = 4,320 lbs = 2.16 tons
day
é. Equipment
_e One (1) 6 ton capacity Liquid Carbon Dioxide storage tank system complete
with refrigeration unit (6 tor is minimum for CO, delivery by tanker truck)
One (1) 12 kW electric vaporizer
One (1) vapor heater |
One (1) First stage CO, pressure regulator
One (1) Carbon Dioxide pH control panel
One (1) Carbon Dioxide gas diffuser assembly i
One (1) pH Transducer : ‘
Two (2) 7” Diameter Ceramic Disk-type diffusers
3. DECANT TOWER
a. Process Description
The decant tower is a 6’x6’ precast manhole with three (3) 12”W x 36”H staggered
openings that will provide 9’ of total operating depth for decanting. Each opening
has an interior wall-mounted inverted slide gate with a manual operator and an
external stoplog channel to allow maintenance on the slide gate when necessary. ' i
An under-flow baffle wall will be installed to promote CO, transfer into the decant .
waste stream and prevent short circuiting. A pH probe will be installed just below
the invert of the 8” gravity pipe to the decant pump station.
b. Design Criteria . , 7
f |
:
‘e Average day flow rate = 60 gpm
. Peak day flow rate = 140 gpm
xxxEND_PAGE:deq09_b3_109_205_95
ee
Flint WTP
Phase Il, Segment II
Lime Residual Disposal
Flint Mt, 48505
4
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KR teo a DALY COMPANY,
Lockwood, Andrews|
i on &Newnam, Inc.
rlansane
ENGINEERING
ogre
peer
1311 South Linden Road, Suite B
i Flint, MI 49532
‘Vel 610-820-2682 Fax 810-820-2703
\ ROWE PROFESSIONAL
SERVICES COMPANY
Fina mast —
FREEBOARD ELEVATION: 744.6 We "
Pnorosep une EVO TNE KEY PLAN
= aa
SURFACE AREA OF LAGOON ( ~\ ‘
WITHIN PROPOSED LIME \ a
ELEVATION BOUNDARY, = LE-~™—\ J
830,000 SFT (19 ACRES) i" |FREEHOARO ELEVATIONS 7448
Py,
a ~~
f PROPOSED LINE ELEVATION: 738." y { i. REVISIONS
wv | a Cosa on
FREEBORAD ELEVATION: 74.8 2 fT
ire
DRAWINGS\,..
ay faa
a
ai
Ag p= q FILE LOG
FREEBOARD ELEVATION: 741.6“ dt
- - aw) ui heme [a
H om [|
i)
Fal = ™
Wie i awa aS
nH A
Ih
\ aaer
EXISTING CONCRETE ANO DEBRIS
FREEBOARD ELEVATION
PILING TO EXCEED FREEBOARD ELEVATION
Ss
PROPOSED LINE SLUDGE i
EXISTING
‘UME SLUDGE
Project No, 130-10701-001
Date: February 28, 2014
Drawings\gray Rood Lime Lagoon Drawings\Piling Concept.dug Plotted:3/25/2014 2:49 PM By:Kevin Janes
Ise: PW; \\LADPW.LADCO.INT: PROJECTWISE\OOCUMENTS \PROJECTS \130—10701—001 \4—0— PRODUCTION \4—01.
3-5 FE foun | . /
BUD ADALY Gomrpany 2014
xxxEND_PAGE:deq09_b3_109_205_96
Designed to meet the most stringent industry performahce
standards for superior structural integrity while providing
designers with a cost-effective method to save |
valuable land and protect water resources.
The StormTech system is designed primarily
to be used under parking lots thus
maximizing land usage for commercial
and municipal applications.
StormTech MC-3500 Chamber (not to scale) 7 StormTech MC-3500 End Cap (not to scale)
Nominal Chamber Specifications '. Nominal End Cap Specifications
Size {Lx Wx H) 90" (2286 mm) x 77" (1956 mm) x 45" (1143 mm). \ Size (Lx W XH) 26.5" (673 mm) x 71 (1803 mm) x 45.1' (1145 mm}
Chamber Storage 109.9 #? (3.14 m'} End Cap Storage 15.6 fi? (0.44 m°}
Min, installed Storage* 178.9 ft? (5.05 m') | ; Min. Installed storage! 46.9 ff (1.33 m?)
Weight 134 Ibs (60,8 kg) *) Weight 43 Ibs (19.5 kg)
“This assumes a-minimum of 42° (305 mm) of stone above, 9° (229 mm) of stone below +: *This assumes a minimum of 12* (305 mm) of stone above, 9" (229 mm) of stone below,
stone porosity.
chambers, 9° (229 mm) of stone between chambers/end caps and 40% stone porosity. t "6" (152 mm) of stone perimeter, 9* (229 mun) of stone betveen chambers/end caps and 40%
i
Shipping
15 chambers/pallet
16 end caps/pallet
7 pallets/track
22.6"
(574 mm)
INSTALLED
45.1"
(1145 mm)
26.1
(673 mm)
90,0" (2286 mm) L 71.0" (1803 mm)
[--——— 86.0" (2184 mm) INSTALLED
45,0"
(1143 mm)
77.0" (4856 mm)
Call StormTech at 888.892,2694 for technical and product information or visit www.stormtech.com 13
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