HomeMy WebLinkAboutContract 63134Date Received: 4/21/2025
Time Received: 8:02 a.m.
Permit No.: SWFMA-24-0123
City Secretary No.:
STORMWATER FACILITY
MAINTENANCE AGREEMENT
63134
THIS AGREEMENT, made and entered into this 2 day of A
2025, by and between Blue Mound Stone Partners. LP. acting by and through Matthew
MacConnell, its duly authorized Vice President, hereinafter referred to as "Landowner",
and the City of Fort Worth, hereinafter referred to as "City".
WITNESSETH
WHEREAS, the Landowner is the owner of certain real property described as Lot
1, Block 1 of Spencer Business Park, a subdivision in Tarrant County, Texas according to
the deed recorded in Document No. D222006701. Deed Records, Tarrant County, Texas,
hereinafter called the "Property";
WHEREAS, the Landowner is proceeding to build on and develop the Property
according to the Site Plan/Subdivision Plan known as Murphy USA #5623 hereinafter
called the "Plan", which is expressly made a part hereof, as approved or to be approved by
the City and the Landowner provides for management of storm water within the confines
of the Property; and;
WHEREAS, the City and the Landowner, and their successors and assigns, agree
that the health, safety and welfare of the residents of the City of Fort Worth, Texas require
that on -site Stormwater Management Facilities be constructed and maintained on a portion
of the Property; and
WHEREAS, the City requires that on -site Stormwater Management Facilities
("facility") as shown on the Plan be constructed and adequately maintained by the
Landowner, its successors and assigns, the location and dimensions of which is shown and
STORMWATER FACILITY MAINTENANCE AGREEMENT OFFICIAL RECORD
Rev. 0310112022 BN CITY SECRETARY
FT. WORTH, TX
more particularly described by metes and bounds in the attached Exhibit "A" ("Facility
Property"); and
NOW, THEREFORE, in consideration of the foregoing premises, the mutual
covenants contained herein, and the following terms and conditions, the parties hereto
agree as follows:
1. The Landowner, its successors and assigns, shall adequately construct and
maintain the on -site Stormwater Management Facility ("Facility") at no
expense to the City of Fort Worth in accordance with the design specifications
for the Facility, attached as Exhibit "B", and the current standards then in force
and effect in the City of Fort Worth and with the Operations and Maintenance
Plan attached to this Agreement as Exhibit "C". The Stormwater Facility
includes all pipes, -channels or other conveyances built to convey Stormwater
to the facility, as well as all structures, improvements, and vegetation provided
to control the quantity and quality of the Stormwater. Adequate maintenance is
herein defined as good working condition so that these facilities are performing
their design functions. The Stormwater Structural Control Maintenance
Checklists, attached to this Agreement as Exhibit "D", are to be used to
establish what good working condition is acceptable to the City.
2. The Landowner, its successors and assigns, shall inspect the Facility and
submit an inspection report to the City annually. The purpose of the inspection
is to assure safe and proper functioning of the Facility. The inspection shall
cover the entire Facility, berms, outlet structure, pond areas, access roads, etc.
Components of the Facility, which need maintenance or replacement to
perform their design function, shall be noted in the inspection report along with
the corrective actions to be taken.
3. The Landowner, its successors and assigns, hereby grant permission to the
City, its authorized agents and employees, to enter upon the Property and to
inspect the Facility Property whenever the City deems necessary. The purpose
of inspection is to follow-up on reported deficiencies and/or to respond to
STORMWATER FACILITY MAINTENANCE AGREEMENT 2
Rev. o31o1l2422 BN
citizen complaints. The City shall provide the Landowner, its successors and
assigns, copies of the inspection findings and a directive to commence with the
repairs if necessary.
4. In the event the Landowner, its successors and assigns, fail to maintain the
Facility in good working condition as specified herein, the City, its authorized
agents and employees, may enter upon the Facility Property and take whatever
steps necessary_ to correct deficiencies identified in the inspection report and to
charge the costs of such repairs to the Landowner, its successors and assigns.
It is expressly understood and agreed that the City is under no obligation
to routinely maintain or repair said Facility, and in no event shall this
Agreement be construed to impose any such obligation on the City, such
obligation is Landowner's.
5. The Landowner, its successors and assigns, will perform the work necessary to
keep the Facility in good working order as appropriate. In the event the City
pursuant to this Agreement, performs work of any nature, or expends any funds
in performance of said work for labor, use of equipment, supplies, materials,
and the like, the Landowner, its successors and assigns, shall reimburse the
City upon demand, within thirty (30) days of receipt thereof for all actual costs
incurred by the City hereunder. In the event that Landowner or its successors
or assigns fail to pay the City for the costs incurred under this section, the City
shall impress a lien .for the costs of such work upon other lots owned by the
Landowner. Such lien shall be perfected by filing in the office of the County
Cleric of Tarrant County, Texas an affidavit identifying the property to be
charged with such lien, stating the amount thereof, and making reference to
this Agreement.
6. This Agreement imposes no liability of any kind whatsoever on the City. THE
LANDOWNER AGREES TO HOLD THE CITY HARMLESS FROM
ANY LIABILITY IN THE EVENT THE FACILITY FAILS TO
OPERATE PROPERLY. LANDOWNER COVENANT AND AGREE
AND DOES HEREBY INDEMNIFY, HOLD HARMLESS AND DEFEND
THE CITY OF FORT WORTH, ITS AGENTS, SERVANTS AND
STORMWATER FACILITY MAINTENANCE AGREEMENT 3
Rev. 03/01/2022 BN
EMPLOYEES FROM AND AGAINST ALL COSTS, EXPENSES,
LOSSES, DAMAGES, CLAIMS OR CAUSES OF ACTION
WHATSOEVER ARISING, OR WHICH MIGHT ARISE, FROM THE
FAILURE OF LANDOWNER OR ANY FUTURE OWNERS OF THE
ABOVE FACILITY PROPERTY TO MAINTAIN THE FACILITY,
INCLUDING, BUT NOT LIMITED TO THE BED AND BANKS OF
THE DETENTION POND; ANY DAMAGES CAUSED TO PERSON OR
PROPERTY DUE TO (1) FLOODING OF THE POND AND ITS
BANKS, (2) SLOPE FAILURE OF THE BANKS OF THE POND, OR (3)
FAILURE OF THE POND OR ITS BANKS TO OPERATE IN A
MANNER CONSISTENT WITH CITY OF FORT WORTH CRITERIA
TO PERFORM ANY OTHER DUTIES OR OBLIGATIONS
HEREUNDER.
7. Landowner covenants and agrees that no habitable building shall be erected
within the boundaries of the Property in which the Facility is located as
outlined on Exhibit "A" but this paragraph shall not preclude construction of
other improvements within the boundaries of the Property in which the Facility
is located, which do not impede drainage. Landowner covenants and agrees
that no habitable building shall be erected on the above property abutting such
boundaries of the Property in which is Facility is located, which shall have a
finished floor at an elevation less than two feet above the 'maximum depth of
water in the detention pond which would occur during a 100-year frequency
flood.
8. This Agreement shall be recorded among the land records of Tarrant County,
Texas, shall constitute a covenant running with the land, and shall be binding
on the Landowner, its administrators, executors, assigns, heirs and any other
successors in interests, including any property owner's association.
STORMWATER FACILITY MAINTENANCE AGREEMENT 4
Rev. 03/01/2022 BN
Executed this 21st day of April 2025.
CITY OF FORT WORTH
LANDOWNER
Blue Mound Stone Partners, LP
a Texas limited partnership
C>�
By: MALOUF INTEREST, INC.
Jesica McEachern
a Texas corporation
Assistant City Manager
its general pa ner
City of Fort Worth
nn
Date: Apr 18, 2025
By: Matthew MacConnell
Its: Vice President
Approved as to Form and Legality:
Date:
Contract Compliance Manager:
Matthew Murray
Senior City Assistant Attorney
By signing, I acknowledge that I am the
City Attorney's Office
person responsible for the monitoring and
administration of this contract, including
Date: Apr 8, 2025
ensuring all performance and reporting
requirements.
p O��OR>q�pa
ATTEST: >,o°A Odd
lCan�frce Me��rcl�
Kandice Merrick (Apr 8, 202516:14 CDT)
as°moo 9'♦d
Kandice Merrick
Planning Manager
Jannette S. Goodall
Development Services
City Secretary
Date: p A r 8 2025
Date: Apr 21, 2025
OFFICIAL RECORD
CITY SECRETARY
FT. WORTH, TX
STORMWATER FACILITY MAINTENANCE AGREEMENT 5
Rev, 03/01/2022 BN
STATE OF TEXAS §
COUNTY OF TARRANT
This instrument was acknowledged before me on April 18th, 2025 by
Jesica Eachern; Assistant .City Manager of the City of Fort Worth, on behalf of the City of
Fort Worth.
------------
p0.�PUe KATHLEEN BRADFORD
a Notary Public
+®+ STATE OF TEXAS
Notary I.D. 1214
7197
9�oF' My Comm. Exp: Apr. 12, 2027
LANDOWNER
STATE OF Z'xe'S
COUNTY OF T2Ai <[ti.3
K a
Notary Public, -state of Texas
M
BEFORE ME, the undersigned .authority, a Notary Public in and for the State of
op this day personally appeared G avr�_ 1
(name), V: f .cam (title), known to .me to be the
person whose name is subscribed :to the foregoing instrument, and acknowledged to me
that he/she executed the same for the purposes and consideration therein expressed, as the
act and deed of A & i p 5 kors- �Gtr ► 5- 1-1' (entity), a
XI s ovfq� (entity type) and in the capacity therein
stated:
GIVEN UNDER MY HAND AND SEAL OF OFFICE this o day
of /���� , 20
--- Notary P'c, State of
JOSEPH ASKEW
'e My Notary ID # 130226940
Expires June 19, 2027
$TORMWATER FACILITY MAINTENANCE AGREEMENT 6
Rev. 03/01/2022 9N
EXHIBIT "A"
LEGAL DESCRIPTION
STORMWATER FACILITY MAINTENANCE AGREEMENT
Rev. 03/01/2022 BN
DRAINAGE EASEMENT
0.2205 OF AN ACRE TRACT
SITUATED IN THE JOSIAH WALKER SURVEY,
ABSTRACT NO. 1602
CITY OF FORT WORTH,
TARRANT COUNTY, TEXAS
A TRACT OR PARCEL CONTAINING 0.2205 OF AN ACRE OR 9,606 SQUARE FEET OF LAND SITUATED IN
THE JOSIAH WALKER SURVEY, ABSTRACT NUMBER NO. 1602, TARRANT COUNTY, TEXAS, BEING OUT OF
LOT 1 BLOCK 1, SPENCER BUSINESS PARK, AN ADDITION TO THE CITY OF FORT WORTH, ACCORDING TO
THE MAP OR PLAT THEREOF RECORDED IN CABINET A, SLIDE 5953, OFFICIAL PLAT RECORDS TARRANT
COUNTY, TEXAS, (O.P.R.T.C.T.) ALSO BEING A PORTION OF THAT TRACT OF LAND DESCRIBED TO BLUE
CENTER, LTD., IN SPECIAL WARRANTY DEED RECORDED IN DOCUMENT (DOC,) NO. D200138247,
O.P.R.T.C.T., WITH SAID 0.2202 OF AN ACRE TRACT BEING MORE PARTICULARLY DESCRIBED BY METES
AND BOUNDS AS FOLLOWS, WITH ALL BEARINGS BASED ON THE TEXAS COORDINATE SYSTEM OF 1983,
NORTH CENTRAL ZONE €NAD83):
COMMENCING, AT A 1/2 IRON ROD FOUND AT THE SOUTHWEST CORNER OF LOT 1, BLOCK A, BLUE
CENTER ADDTION, AS SHOWN IN THE PLAT RECORDED IN DOC. NO. D216158829, O.P.R.T.C.T., ALONG THE
NORTH RIGHT OF WAY OF WESTERN CENTER BOULEVARD, AS SHOWN IN THE PLAT RECORDED IN CABINET
A, SLIDE 5953, O.P.R.T.C.T.;
THENCE, OVER AND ACROSS SAID LOT 1 OF SPENCER BUSINESS PARK THE FOLLOWING COURSES AND
DISTANCES;
NORTH 89 DEG. 16 MIN. 28 SEC., ALONG THE NORTH RIGHT OF WAY OF WESTERN CENTER
BOULEVARD, A DISTANCE OF 107.96 FEET TO A POINT OF FOR CORNER;
NORTH 0 DEG. 43 MIN. 32 SEC. EAST, A DISTANCE OF 13.26 FEET TO POINT OF BEGINNING;
NORTH
89 DEG.
16
MIN.
29 SEC.
WEST,
A DISTANCE OF 64.13 FEET TO A POINT FOR CORNER;
NORTH
0 DEG.
43
MIN.
31 SEC.
EAST,
A DISTANCE OF 24.25 FEET TO A POINT FOR CORNER;
NORTH
89 DEG.
16
MIN.
29 SEC.
WEST,
A DISTANCE OF 20.26 FEET TO A POINT FOR CORNER;
SOUTH
0 DEG.
43
MIN.
31 SEC.
WEST,
A DISTANCE OF 9.99 FEET TO A POINT FOR CORNER;
NORTH
89 DEG.
15
MIN.
7 SEC.
WEST,
A DISTANCE OF 23.13 FEET TO A POINT FOR CORNER;
NORTH
0 DEG.
50
MIN.
23 SEC.
WEST,
A DISTANCE OF 136.44 FEET TO A POINT FOR CORNER;
NORTH
29 DEG.
9
MIN.
37 SEC.
EAST,
A DISTANCE OF 1.96 FEET TO A POINT FOR CORNER;
SOUTH
89 DEG.
16
MIN.
29 SEC.
EAST,
A DISTANCE OF 58.68 FEET TO A POINT FOR CORNER;
SOUTH
0 DEG.
43
MIN.
31 SEC.
WEST,
A DISTANCE OF 120.37 FEET TO A POINT FOR CORNER;
SOUTH
89 DEG.
16
MIN,
29 SEC.
EAST,
A DISTANCE OF 51.61 FEET TO A POINT FOR CORNER;
SOUTH
0 DEG.
41
MIN.
58 SEC.
WEST,
OVER AND ACROSS LOT 1, A DISTANCE OF 32 FEET TO
THE POINT OF BEGINNING
AND CONTAINING
0.2205 OF AN ACRE, OR 9,606 SQUARE FEET.
FIELDED BY: -
DRAWN BY: JL
CHECKED BY: SS
JOB NO. D56745
SHEET 1 OF 2
RPLS No. 6599
DATE: 10/31 /2024
REV: 12/02/2024 W I N D R O S E
REV:
REV: LAND SURVEYING I PLATTING
1760 S STEMMONS FREEWAY, SUITE 180 1 LEWISVILLE, TX 75067 1 214.217.2544
REV: FIRM REGISTRATION NO. 10194331 1 WINDROSESERVICES.COM
(!DNORTH
SCALE- 1• - 40'
40
0
40
1
LINE TABLE
LINE
BEARING
DISTANCE
L1
N 00'43'31"
E
24.25'
L2
N 89*16'29"
W
20.26'
L3
S 00"43'31"
W
9.99,
L4
N 89*15'07"
W
23.13'
L5
N 29"09'37"
E
1.96'
L6
S 00°41'58"
W
32.00'
RPLS No. 6599
DRAINAGE EASEMENT
0.2205 OF AN ACRE TRACT
SITUATED IN THE JOSIAH WALKER SURVEY
ABSTRACT NO. 1602
CITY OF FORT WORTH,
TARRANT COUNTY, TEXAS
h S 89'16'29" E 58.68'
M
3
i�
N
O
O
iA
GENERAL NOTES
1. SURVEYOR DID NOT ABSTRACT SUBJECT PROPERTY, THIS
SURVEY WAS PREPARED WITHOUT THE BENEFIT OF A
CURRENT TITLE REPORT OR ABSTRACTORS CERTIFICATE
AND WOULD BE SUBJECT TO ANY AND ALL CONDITIONS
OR RESTRICTIONS THAT A CURRENT TITLE REPORT OR
ABSTRACTORS CERTIFICATE MAY DISCLOSE.
2. BEARINGS WERE BASED ON THE TEXAS COORDINATE
SYSTEM OF 1983, NORTH CENTRAL ZONE. (NAD83)
3. THIS EXHIBIT DOES NOT IMPLY TO BE A LAND TITLE
SURVEY OF THE SUBJECT PROPERTY AND IS NOT
INTENDED TO BE USED FOR TITLE CONVEYANCE
PURPOSES.
LOT 1, BLOCK 1
SPENCER BUISNESS PARK
CAB. A, SLIDE 5953,
P.R.T.C.T.
BLUE MOUND STONE
M
PARTNERS, L.P.
Q
DOC. NO. D222006701
N
O.P.R. T.C. T.
3
M
o DRAINAGE EASEMENT
/ u) 0.2205 OF AN ACRE/ 9,606 SQ. FT.
/ S 89.16-29" E 51.61'
L2
L4
\ O.B. I
/�• N 00'4332" E P.O.C.
\ N 89'16'29" W 64.13' 1/2" REBAR 1/2" REBAR
(C.M.) C.M.)
WESTERN CENTER BLVD N 897628" W 107.96'
VARIABLE WIDTH
FIELDED BY: -
DRAWN BY: JL
CHECKED BY: SS
JOB NO. D56745
SHEET 2 OF 2
DATE: 10/31 /2024
REV: 12/02/2024 W I N D R O S E
REV:
REV: LAND SURVEYING I PLATTING
1760 S STEMMONS FREEWAY, SUITE 180 1 LEWISVILLE, TX 75067 1 214.217.2544
REV: FIRM REGISTRATION NO. 10194331 1 WIN DROSES ERVICES.COM
EXHIBIT "B"
DESIGN PLAN AND SPECIFICATIONS
STORMWATER FACILITY MAINTENANCE AGREEMENT
Rev. 03/01/2022 BN
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PROP, 1V SANITARY I WEO CENTER RDAO
ION
SEVER EASEMENi�—I OOC. N0. DTOJ]]2, P.R..RY OEEIGPER 220J
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BLUE OUND
DOC. NO. D222158605. D.R.T.C.T.
M
DOC N0. D22200622006]O1. PARTNERS, LP DNTCi SOMENT
353]'
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12.63' Nc is N SS i SPENCER , PARK
CABINET PG. 5953, P.R.T.0 T.
4600' moo
DP'NEFP D'--RG MOUND 1. D.RRs u=
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BY DEVELOPER - '
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WESTERN CENTER BOULEVARD
(VARIABLE WIDTH RIGHT-OF-WAY)
NOTE:
NO SAVED OR PROPOSED TREES ARE
WITHIN THE SWFMA BOUNDARY LIMITS.
PRE -CONSTRUCTION
IMPERVIOUS SITE RATIO (ISR)
AREA SQUARE FEET %
IMPERVIOUS (ROOF AND PAVING) 10,170 20
IANDSCAPE AREA 39,830 80
GROSS SITE 50,000 ,00
N
L
THESE DRAWINGS DO NOT INCLUDE
COMPONENTS FOR CONSTRUCTION SAFETY
CBK
11A1 AND PRE6ERNE
Y ANG ALL DNDERGAGDND DTILITIE6
CaAPHIOC SCA 10
�._. 2:0
1 INCHca
BUILDING SETBACKS:
STU1111 TONOFENGOM A$$EGTHE
ENTIRE WORK AREA, IRE DETAIL2P1
cONTaAOToa TO EISVIE THE IOHT P—R ANI
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THCUFAT.PRFLIGHTPOLEVEES_NE
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PROPOSED
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POST -CONSTRUCTION
IMPERVIOUS SITE RATIO (ISR)
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LANDSCAPE AREA 14,745 29
GROSS SITE SO,000 1O0
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GESCRIPm xc I RO EUREI
NGSRUEUTTATIIONON , S I RE,MR DNGERGANo1
PY AGCESSI9U TOTAL
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,N9,6E IRE MR DN a PY AG 1 TOTAL
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TIE CONTRACT- IS SPECIFICALLY CATTIONSO THAT THE LOCATION XNEEEHR F—HON
I.SSIT..L.,
Ty
EAS—ENT. TAKEN IN THE THE INFORMATION 1.
. BE
QE
RELIED ON AS BEING EXACT OR COMPLETE THE
IFLOCATEI
PROPOSEDI
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WESTERN CENTER BOULEVARD
(VARIABLE WIDTH RIGHT-OF-WAY)
NOTE:
NO SAVED OR PROPOSED TREES ARE
WITHIN THE SWFMA BOUNDARY LIMITS.
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SEE SHEET C-4.3 FOR BUILDING
ROOF AND CANOPY DRAINAGE
,
6BB83 _ -00K
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DUMPSTER ENCLOSURE DRAINAGE
THESE DRAWINGS DO NOT INCLUDE
COMPONENTS FOR CONSTRUCTION SAFETY
Z
BY IS FA TIRE TO 1-11 LGOATE AND PRESEROE
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SHEET
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FOR REFERENCE ONLY
(NOT TO SCALE)
GRA HIC SCALE
UlGE"
DRAINAGE AREA
AREA IN AS
�-FWW FOR DRANAGE AREA IN
I— —1—NAGE AREA BOUNDARI
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NOTES
FOR DPNNAGEARFAS =2 "PT`B=E MOUNDS—I'STORAGE
PREPARED BY COUUMBUS DESIGN.
Napo==,
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C_cO,AUTION—CTON NOTIlg,,�J� TFF �(V, IrJ J)J 1ATIll A"1111 IN IS. HESE =1.
OF EXISTING UT N
"T'S AS S."O'"Ll'" T..FANIFA AN., —PRE —AN— UTI TIG
RFG.'.B OF` POSSIBLE, MEASUREMENTS TAMN IN THE FIELD THE INFORNATION IS
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CAUTION NOTICE TO CONTRACTORS I 6 a. 10 0.38 1.U6 0.15 I. C.21 9.2G B.31 sheet news ED nrpbDsee vote 7nlete
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THEPERRTHECINTYNO SAVED OR PROPOSED TREES ARE I Taw: las x62
PROPOSED IMPRovEM ENrs sHowry ory rHESE PLArvs WITHIN THE SWFMA BOUNDARY LIMITS. •ihhs-i. Ls mr MldNldual-pn[sta[-wwa for each drainage arw. ^-4•3
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Lv 1
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AL
j� DOC. NO. D222158605. D.R.T.C.T.
D PRIA EASEMENT BLU OONDMSTONE PARTNERS, LP INt02`
BY DEVELOPERS N0. D222006T01. DRTCi 15 IT 2�WE,Z MENT
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WITHIN THE SWFMA BOUNDARY LIMITS.
1P.RUTC.T�O216158�
T
THESE DRAWINGS DO NOT INCLUDE
COMPONENTS FOR CONSTRUCTION SAFETY
Z
ALL CANOPY DRAINAGE TO BE
O
A MIN. OF 6" BELOW ALL
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PRESERVE
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18" RCP_
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0.21' NOTICE TO CONTRACTORS ��WNor.nm.e.a-an.n...aw ��' �'mp''rwA. rarxn,n�nrarpru..
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C-4.7
PROJECT SUMMARY
CALCULATION DETAILS
• LOADING = HS20/HS25
•APPROX. LINEAR FOOTAGE = 2,401 LF
STORAGE SUMMARY
• STORAGE VOLUME REQUIRED m 9,250 CF
• PIPE STORAGE VOLUME = 6.864 OF
• BACKFILL STORAGE VOLUME = 165 CF
• TOTAL STORAGE PROVIDED - 7,029 CF
• STONE VOID = 40%
PIPE DETAILS
• DIAMETER = 1T
• CORRUGATION = 2 2/3XI/2
GAGE = 16
• COATING = ALT2
• WALL TYPE=XFILTRATION
• BARREL SPACING =12'
BACKFILL DETAILS
• WIDTH AT ENDS =12"
-ABOVE PIPE = 0'
• WIDTH AT SIDE6 -IT
• BELOW PIPE = 0'
NOTES
-A L RISERAND STUB DIMENSIONS ARE TO
CENTERLINE. ALL ELEVATIONS, DIMENSIONS. AND
LOCATIONS OF RISERS AND INLETS, SHALL BE
VERIFIED BY THE ENGINEER OF RECORD PRIOR TO
„ RELEASING FOR FABRICATION
S • ALL FITTINGS AND REINFORCEMENT COMPLY WITH
ASTM A998.
• ALL RISERS AND STUBS ARE 223 zit CORRUGATION
AND 16 GAGE UNLESS OTHERWISE NOTED.
5 • RISERS TO BE FIELD TRIMMED TO GRADE.
• QUANTITY OF PIPE SHOWN DOES NOT PROVIDE
Y EXTRA PIPE FOR CONNECTING THE SYSTEM TO
H EXISTING PIPE OR DRAINAGE STRUCTURES. OUR
SYSTEMAS DETAILED PROVIDES NOMINAL INLET
AND/OR OUTLET PIPE STUB FOR CONNECTION TO
EXISTING DRAINAGE FACILITIES. IF ADDITIONAL PIPE
IS NEEDED IT IS THE RESPONSIBILITY OF THE
CONTRACTOR.
- • BAND TYPE TO BE DETERMINED UPON FINAL DESIGN.
• THE PROJECT SUMMARY IS REFLECTIVE OF THE
DYODS DESIGN, QUANTITIES ARE APPROX. AND
_ SHOULD BE VERIFIED UPON FINAL DESIGN AND
APPROVAL. FOR EXAMPLE, TOTAL EXCAVATION DOES
NOT CONSIDER ALL VARIABLES SUCH AS SHORING
ANDONLYACCOUNTS FOR MATERIAL WITHIN THE
ESTIMATED EXCAVATION FOOTPRINT.
• THESE DRAWINGSARE FOR CONCEPTUAL PURPOSES
ANDDONOT REFLECT ANY LOCAL PREFERENCESOR
REGULATIONS. PLEASE CONTACT YOUR LOCAL
6 CONTECH REP FOR MODIFICATIONS.
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TABLE I: J \\�.� INSTALLATION NOTE 3 A\j/\� 1. WHEN PLACING THE FIRST LIFTS OF BACKFILL IT IS
Ny' IMPORTANTTO MAKE SURE THAT THE BACKFILL IS PROPERLY 6
COMPACTED UNDER AND AROUND THE PIPE HAUNCHES. $
DIAMETER, D MIN. CORR. B �y ��� v
COVER PROFILE I y� - / 2. OTHER ALTERNATE BACKFILL CONDITIONS,
MAY BE ALLOWED
DEPENDINGER SITE SPECIFIC CONDITIONS, AS APPROVED BY
/ \\ /�� \\\\ /✓F /�/r SITE ENGINEER.
8'-10' 12' 121r7x1q'
72'd6' 12'
w 4 'CMP 3. IF SALTING AGENTS FOR SNOW AND ICE REMOVALARE USED
2/3'x V2' Ow�\� \ 0 \\ \V
pO / ,1 // ONORNEAR NDED PROJECT, AGER HALF FT BARRIER 13
RECOMMENDED OVER THEUPPERTO HEFTHEPIPE.THE T6PE FIRM REDsmAnaN
i \// \ / HAUNCH �I � / j� j / � / GEOMEMBRANE LINER IS INTENDED TO HELP PROTECT THE �
>96' D18 3 1'. 5'x 1' 8 \ ZONE / v � SYSTEM FROM THE POTENTIALADVERSE EFFECTS THAT MAY dptE.. °F..L,E3L11
/ RESULT FROM A CHANGE IN THE SURROUNDING +
• STRUCTURAL BACKFILL MUST EXTEND TO .. (�\/� • -• \�////�y ENVIRONMENT OVER APERIOD OF TIME PLEASE REFER TO
IA r/`
LIMITS OF THE TABLE \ /\/ - _�-�� THE CORRUGATED METAL PIPE DETENTION DESIGN GUIDE
• TOTAL HEIGHT OF COMPACTED COVER FOR /\ .• ABOVE DETAIL ISA FOR ADDITIONAL INFORMATION. a.
CONVENTIONAL HICOMPAC COMPACTED
\ ° / � H`_
MEASURED FROM TOP OF PIPE TO BOTTOM Rom._ RECOMMENDATION. CONSULT
Imes EV'nIA�WW¢�
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A/EMENFOR PROJECT BLE PAVEMENT OR TOP OF RIGID V� /y1/\\� \ �l�J\ \\ /�\1\ \ \/n\ \/\j \ T SPECFCB CKFEOL REQUREMENTS. '� < ''RNV✓'
TRENCH f `,�1 FILL/ENVELOPEE--'/1 EMBANKMENT 6
MINIMUM WIDTH DEPENDS ON SITE CONDITIONS AND ENGINEERING JUDGEMENT
TABLE 2: xFiltRoW,
XFILTRATION JOINT STANDARD BACKFILL SPECIFICATIONS
MATERLALLOCATION MATERIAL SPECIFICATION DESCRIPTION
MINIMUM TRENCH WIDTH MUSTALLOW ROOM FOR PROPER COMPACTION OF MINIMUM EMBANKMENT WIDTH (IN FEET) FOR INITIAL FILL ENVELOPE: °
HAUNCH MATERIALS UNDER THE PIPE. PIPE <24•: 3 OD
1 FILL ENVELOPE WIDTH PER ENGINEER OF RECORD THE SUGGESTED MINIMUM TRENCH WIDTH, OR FOR RECOMMENDATION: PIPE 24'- 144': D+4'0'
PIPE 5 1P': D+ 16'
PIPE > 12" 1 SD+ 12" PIPE> 144": D + URA"
�. PRIOR TO PLACING THE BEDDING, THE FOUNDATION MUST BE CONSTRUCTED TO A UNIFORM AND STABLE GRADE. IN THE EVENT THAT UNSUITABLE FOUNDATION MATERIALS ARE o FOUNDATION AASHT026.5.2-PER ENGINEER OF RECORD ENCOUNTERED DURING EXCAVATION, THEY SHALL BE REMOVED AND FOUNDATION BROUGHT BACK TO GRADE WITH A FILL MATERIALAPPROVED BY THE ENGINEER OF RECORD -
PIPE SHOULD BE PLACED ON THE FOUNDATION BOTTOM WITH A4"-6• MINIMUM STONE DEPTH ROUGHLY SHAPPED TO FIT THE BOTTOM OF THE PIPE. IF THE ENGINEER OF RECORD DETERMINES THAT
-3. BEDDING AASHTO M 43: 3,357, 4,467, 5, 56,57 STONE BEDDING IS NOT NEEDED, THE PIPE MAY BE PLACED ON THE TRENCH BOTTOM SEPERATED WITH A NON -WOVEN GEOTEXTILE PLACED AT TH E INVERT OF A RELATIVELY LOOSE MATERIAL THAT IS
ROUGHLY SHAPED TO FIT THE BOTTOM OF THE PIPE, 2• MIN DEPTH.
4 CORRUGATED METAL PIPE S S
HAUNCH ZONE MATERIAL SHALL BE HAND SHOVELED OR SHOVEL SLICED INTO PLACE TO ALLOW FOR PROPER COMPACTION WITHOUT SOFT SPOTS. BACKFILL SHALL BE PLACED IN B'+l- IS o
FREE -DRAINING, ANGULAR, NATURALLY LOOSE LIFTS AND COMPACTED TO 90% STANDARD PROCTOR PER AASHTO T 99. BACKFILL SHALL BE PLACED SUCH THAT THERE IS NO MORE THAN A TWO LIFT(16') DIFFERENTIAL BETWEEN a '
5 BACKFILL OCCURRING WASHED -STONE PER AASHTO ANYOF THE PIPESATANY TIME DURING THE BACKFILL PROCESS THE BACKFILL SHOULD BE ADVANCED ALONG THE LENGTH OF THE SYSTEM TOAVOID DIFFERENTIAL LOADING. WHERE
$ M 43: 3, 357, 4, 467, 5, 56, 57 OR CONVENTIONAL COMPACTION TESTING IS NOT PRACTICAL, THE MATERIAL SHALL BE MECHANICALLY COMPACTED UNTIL NO FURTHER YIELDING OF MATERIAL IS OBSERVED UNDER THE
APPROVED EQUALCOMPACTOR. "IN
n o
AREAS WITH HIGH WATER TABLE FLUCTUATIONS THAT INTERACT WITH THE PIPE ZONE, CONSIDER INSTALLING A GEOTEXTILE SEPARATION LAYER TO PREVENT SOIL MIGRATION. I �N
5 UP TO MIN. COVER-AASHTO M 145: A-1, A-2, A-3 ABOVE
g COVER MATERIAL MIN. COVER - PER ENGINEER OF RECORD COVER MATERIAL MAY INCLUDE NON -BITUMINOUS, GRANULAR ROADBASE MATERIAL WITHIN MIN COVER LIMITS
G
RIGID OR FLEXIBLE PAVEMENT (IF FLEXIBLE PAVEMENT SHOULD NOT BE COUNTED AS PART OF THE FILL HEIGHT OVER THE CMP. FINAL BACKFILL MATERIAL SELECTION AND COMPACTION REQUIREMENTS SMALL FOLLOW THE v
� T APPLICABLE) PER ENGINEER OF RECORD PROJECT PLANS AND SPECIFICATIONS PER THE ENGINEER OF RECORD.
A SIDE GEOTEXTILE NONE
GEOTEXTILE LAYER IS RECOMMENDED ON SIDES OF EXCAVATION TO PREVENT SOIL MIGRATION WHEN STONE BEDDING IS USED.
'p 1� IF NO STONE BEDDING IS USED, THEN SIDE GEOTEXTILE IS REQUIRED. ¢ _ _
B GEOTEXTILE BETWEEN LAYERS NONE IF SOIL TYPES DIFFERATANY POINTABOVE PIPE INVERT,A GEOTEXTILE LAYER IS RECOMMENDED TO BE PLACED BETWEEN THE LAYERS TO PREVENT SOIL MIGRATION.
NOTES:
- • FOR MULTIPLE BARREL INSTALLATIONS, THE RECOMMENDED STANDARD SPACING BETWEEN PARALLEL PIPE RUNS SHALL BE THE PIPE DIAMETER 12 BUT NO LESS THAN 12"FOR DIAMETERS <72' FOR 72'AND LARGER DIAMETERS, THE MINIMUM SPACING IS 36". CONTACT
YOUR CONTECH REPRESENTATIVE FOR NONSTANDARD SPACING,
APPROVED REGIONAL EQUIVALENTS FOR SECTION 5INCLUDE CA-7, MIDOT 6AA, 6A, OR 53, PROVIDED THEY MEET THE PARTICLE SIZES INDICATED. ❑
MANUFACTURER RECOMMENDED BACKFILL w
NOT TO SCALE a
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26'
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4'X4' _ #5 Q 12' OCEW 1,780
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aCMP RISER 36' 15' S' 38. #5Q 10'OCEW 1.89D
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HE
MEET
46" 50 Ims''?bxAi E
THE TOPOF THEPIPE CONSTRUCTION
EQUIPMENT
TNEC NECESSITATES
MINIMUM REQUIREMENTS PROTECTION
BELOW CONTRACTOR. SECTION VIEW ASSUMED SOILBE 6- CAPACITY "FIE<,FECLE.� •
eB - 11-TYP - t�ON e8' fi' #SQ9'OCEW 1,fi0D
THE USE OF HEAVY CONSTRUCTION EOUIPMEM NECESSITATES GREATER PROTECTION FOR THE PIPE THAN FINISHED ..,....
GRADE COVER MINIMUMS FOR NORMAL HIGHWAY TRAFFIC. � X6' #SQ8'OCEW 1,100
PIPE SPAN, AXLE LOADS (kips)g�///,/,/y/,'I/y,'1
INCHES 1850 50-75 75.110 110-150
a
MINIMUM COVER (FT) °o aA A -
1242 2.0 2.5 3.0 3 0 `
48-72 3.0 30 3.5 40 NDIAGONAL TRIM 1
#4 DIAGONAL TRIM " - BAR (1, 4 PLACES), -
78-120 3.0 35 4.0 40 BAR(TYP. 4 PLACES), SEENOTE7
126-144 3.5 4.0 4.5 4.5 SEE NOTE 7.
2-COVER
'MINIMUM COVER MAY VARY DEPENDING ON LOCAL CONDITIONS. THE CONTRACTOR MUST PROVIDE THE ADDITIONAL_ (TYP) `
COVER REQUIRED TO AVOID DAMAGE TO THE PIPE MINIMUM COVER IS MEASURED FROM THE TOP OF THE PIPE TO '\ '� ° m IS
THE TOP OF THE MAINTAINED CONSTRUCTION ROADWAY SURFACE o
CONSTRUCTION LOADING DIAGRAM k 2de�
SCALE: N.T.S.
OPENING IN
PROTECTION
/
SPECIFICATION FOR DESIGNED DETENTION SYSTEM: SLAB FOR CASTING ` PROTECTION
N
TIOION
SCOPE PIPE -`/ � / : - SLAB FOR
Y_ CASTING L
THIS SPECIFICATION COVERS THE MANUFACTURE AND INSTALLATION OF THE PIPE SHALL BE MANUFACTURED IN ACCORDANCE TO THE APPLICABLE
THE DESIGNED DETENTION SYSTEM DETAILED IN THE PROJECT PLANS. REQUIREMENTS LISTED BELOW: /� 5 3
"
MATERIAL ALUMINIZED TYPE 2' AASHTO M-360R ASTM A-760 INTERRUPTED BAR
THE MATERIAL SHALL CONFORM TO THE APPLICABLE REQUIREMENTS REPLACEMENT, SEE
LISTED BELOW: GALVANIZED: AASHTO M-36 OR ASTM A-760 NOTE 6
9 STANDARD STANDARD INTERRUPTED BAR
ALUMINIZED TYPE 2 STEEL COILS SHALL CONFORM TO THE AMMIO RMCOATED. AASHTO M-246 OR ASTM A-762 REINFORCING, REINFORCING, -, 'B ,
REQUIREMENTS OF AASHTO M-274 OR ASTM A-92. SEE TABLE SEE TABLE REPLACEMENT,
5 ALUMINUM: AASHTO M-196 ORASTM 8-745 SEE NOTE 6.
THE GALVANIZED STEEL COILS SHALL CONFORM TO THE APPLICABLE -
REQUIREMENTSOFAASHTOM-2180RASTMA-929. HANDLING AND ASSEMBLY ROUND OPTION PLAN VIEW SQUARE OPTION PLAN VIEW
SHALL BE IN ACCORDANCE WITH NCSPS (NATIONAL CORRUGATED STEEL v
THE POLYMER COATED STEEL COILS SHALL CONFORM TO THE ARRBEABSECIATION) FOR ALUMINIZED TYPE 2, GALVANIZED OR POLYMER NOTES:
�^ REQUIREMENTS OF AASHTO M-246 ORASTM A-742. COATED STEEL. SHALL BE IN ACCORDANCE WITH THE MANUFACTURER'S
RECOMMENDATIONS FOR ALUMINUM PIPE. 1 DESIGN IN ACCORDANCE WITH AASHTO, 17tN EDITION 7. TRIM OPENING WITH DIAGONAL BARS, EXTEND
THE ALUMINUM COILS SHALL CONFORM TO THE APPLICABLE REQUIREMENTS BARS A MINIMUM OF 12' BEYOND OPENING. BEND
OF AASHTO M-197 OR ASTM B-744. INSTALLATION 2. DESIGN LOAD HS25. BARS AS REQUIRED TO MAINTAIN BAR COVER.
SHALL BE IN ACCORDANCE WITH AASHTO STANDARD SPECIFICATIONS FOR
CONSTRUCTION LOADS HIGHWAY BRIDGES, SECTION 26, DIVISION II DIVISION II OR ASTM A-798(FOR 3. EARTH COVER =1'MAX. 8. PROTECTION SLAB AND ALL MATERIALS TO BE
CONSTRUCTION LOADS MAY BE HIGHER THAN FINAL LOADS. FOLLOW THE ALUMINIZED TYPE 2. GALVANIZED OR POLYMER COATED STEEL)OR ASTM PROVIDED AND INSTALLED BY CONTRACTOR.
MANUFACTURER'S OR NCSPA GUIDELINES. B-788(FOR ALUMINUM PIPE) AND IN CONFORMANCE WITH THE PROJECT 4. CONCRETE STRENGTH =3,500 psi
PLANS AND SPECIFICATIONS. IF THERE ARE ANY INCONSISTENCIES OR 9. DETAIL DESIGN BY DELTA ENGINEERING, BINGHAMTON, NY.
CONFLICTS THE CONTRACTOR SHOULD DISCUSSAND RESOLVE WITH THE 5. REINFORCING STEEL=ASTMA615, GRADE 60. J
SITE ENGINEER.
NOTE 6. PROVIDEADDITIONAL REINFORCING AROUND MANHOLE CAP DETAIL w
THESE DRAWINGSARE FOR CONCEPTUAL IT IS ALWAYS THE RESPONSIBILITY OF THE CONTRACTOR TO FOLLOW OSHA OPEN NOS EQUAL TO THE BARS INTERRUPTED,
PURPOSESANDDONOTREFLECTANYLDCAL GUIDELINES FOR SAFE PRACTICES. HALF EACH SIDE. ADDITIONAL BARS TO BE IN SCALE: N. T.S. z�
PREFERENCESOR REGUTATICNS PLEASE w >
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CAUTION NOTICE TO CONTRACTORS
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CMP DETENTION INSTALLATION GUIDE IN -SITU TRENCH WALL
PROPER INSTALLATION OF A FLEXIBLE UNDERGROUND DETENTION SYSTEM
IF EXCAVATION IS REQUIRED, THE TRENCH WALL NEEDS TO BE CAPABLE OF
WHEN FLOWABLE FILL IS USED, YOU MUST PREVENT PIPE FLOATATION
TYPICALLY SMALL LIFTS ARE PLACED BETWEEN THE PIPES AND THEN
WILL ENSURE LONG-TERM PERFORMANCE THE CONFIGURATION OF THESE
SUPPORTING THE LOAD THAT THE PIPE SHEDS AS THE SYSTEM IS LOADED. IF
ALLOWED TO SET-UP PRIOR TO THE PLACEMENT OF THE NEXT LIFT. THE
SYSTEMS OFTEN REQUIRES SPECIAL CONSTRUCTION PRACTICES THAT
SOILS ARE NOT CAPABLE OF SUPPORTING THESE LOADS, THE PIPE CAN DEFLECT
ALLOWABLE THICKNESS OF THE CLSM LIFT IS A FUNCTION OF A PROPER
DIFFER FROM CONVENTIONAL FLEXIBLE PIPE CONSTRUCTION. CONTECH
PERFORM A SIMPLE SOIL PRESSURE CHECK USING THE APPLIED LOADS TO
LNG
BALANCEF THEEENTHND HE
TFFECT OF OTHERTHE RESTRAINING
WEIGHT OF THE PIPE, AND THE EFFECT OTHER RESTRAINING
ENGINEERED SOLUTIONS STRONGLY SUGGESTS SCHEDULING
DETERMINE THE LIMITS OF EXCAVATION BEYOND THE SPRING LINE OF THE
ED
MEASURES THE PIPE CAN CARRY LIMITED FLUID PRESSURE WITHOUT
PRECONSTRUCTION MEETING WITH YOUR LOCAL SALES ENGINEER TO
OUTER MOST PIPES.
PIPE DISTORTION OR DISPLACEMENT, WHICH ALSOAFFECTS THE CLSM
DETERMINE IF ADDITIONAL MEASURES, NOT COVERED IN THIS GUIDE, ARE
IN MOST CASES THE REQUIREMENTS FOR A SAFE WORK ENVIRONMENT AND
LIFT THICKNESS. YOUR LOCAL CON TECH SALES ENGINEER CAN HELP
APPROPRIATE FOR YOUR SITE.
PROPER BACKFILL PLACEMENTAND COMPACTION TAKE CARE OF THIS CONCERN.
DETERMINE THE PROPER LIFT THICKNESS.
FOUNDATION
r , Lox uuANm srwLBe
CONSTRUCTA FOUNDATION THAT CAN SUPPORT THE DESIGN LOADING
oPrro SEACS
APPLIED BYTHE PIPEANDADJACENT BACKFILLWEIGHTAS WELLAS MAINTAIN
ITS INTEGRITY DURING CONSTRUCTION
IFSOFTOR UNSUITABLE SOILS ARE ENCOUNTERED, REMOVE THE POOR SOILS,
I
'� %� T ��
DOWN TOA SUITABLE DEPTH AND THEN BUILDUP TO THE APPROPRIATE
ELEVATION WITH ACOMPETENT BACKFILL MATERIAL. THE STRUCTURAL FILL
i i oRADsoBEEDS.eEDDlxe
eswwsucxANDsp
I
MATERIAL GRADATION SHOULD NOT ALLOW THE MIGRATION OF FINES, WHICH
D c
CAN CAUSE SETTLEMENT OF THE DETENTION SYSTEM OR PAVEMENTABOVE.
_ r`E
IFTHESTRUCTURAL FILL MATERIAL IS NOT COMPATIBLE WITH THE
UNDERLYING SOILS AN ENGINEERING FABRIC SHOULD BE USED ASA
SEPARATOR IN SOME CASES, USING A STIFF REINFORCING GEOGRID
BACKFILL PLACEMENT
roRmNnrRR,IwANF WaNNTs1
REDUCES OVER EXCAVATION AND REPLACEMENT FILL QUANTITIES.
MATERIAL SHALL BE WORKED INTO THE PIPE HAUNCHES BY MEANS OF
ot:
q�e MISELL LO"s"
SHOVEL -SLICING, RODDING, AIR TAMPER, VIBRATORY ROD, OR OTHER EFFECTIVE
OUtN3Eoio
nIEAN"DxroRDx rD wAsti,DSED
METHODS.
CONSTRUCTION LOADING
GRADE THE FOUNDATION SUBGRADE TO A UNIFORM OR SLIGHTLY SLOPING
GRADE. IF THE SUBGRADE IS CLAY OR RELATIVELY NON -POROUS AND THE
CONSTRUCTION SEQUENCE WILL LAST FORM EXTENDED PERIOD OF TIME,
IT IS BEST TO SLOPE THE GRADE TO ONE END OF THE SYSTEM. THIS WILL
ALLOW EXCESS WATER TO DRAIN QUICKLY, PREVENTING SATURATION OF THE
SUBGRADE.
GEOMEMBRANE BARRIER
> Erns uRRRox le7
THESE DRAWINGS DO NOT INCLUDE
COMPONENTS FOR CONSTRUCTION SAFETY
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CMP DETENTION SYSTEM INSPECTION AND
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UNDERGROUND STORMWATER DETENTION AND INFILTRATION SYSTEMS MUST
Q
BE INSPECTEDAND MAINTAINED AT REGULAR INTERVALS FOR PURPOSES OF
F l7
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PERFORMANCE AND LONGEVITY.
Fla N+
INSPECTION
INSPECTION IS THE KEY TO EFFECTIVE MAINTENANCE OF CMP DETENTION
SYSTEMS AND IS EASILY PERFORMED CONTECH RECOMMENDS ONGOING,
ANNUAL INSPECTIONS. SITES WITH HIGH TRASH LOAD OR SMALL OUTLET
CONTROL ORIFICES MAY NEED MORE FREQUENT INSPECTIONS. THE RATE AT
TEPE FIRM
WHICH THE SYSTEM COLLECTS POLLUTANTS WILL DEPEND MORE ON SITE
eECSTRATION
SPECIFIC ACTIVITIES RATHER THAN THE SIZE OR CONFIGURATION OF THE
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p1ptE' „!I!,iE`1sII
SYSTEM.
INSPECTIONS SHOULD BE PERFORMED MORE OFTEN IN EQUIPMENT
WAS -DOWN AREAS, IN CLIMATES WHERE SANDING ANDIOR SALTING
OPERATIONS TAKE PLACE, AND IN OTHER VARIOUS INSTANCES IN WHICH ONE
44 ryAL Ems=
WOULD EXPECT HIGHER ACCUMULATIONS OF SEDIMENT OR ABRASIVE!
CORROSIVE CONDITIONS. A RECORD OF EACH INSPECTION IS TO BE
MAINTAINED FOR THE LIFE OF THE SYSTEM
MAINTENANCE
CMP DETENTION SYSTEMS SHOULD BE CLEANED WHEN AN INSPECTION
REVEALS ACCUMULATED SEDIMENT OR TRASH IS CLOGGING THE DISCHARGE
-
ORIFICE.
..,
TYPICALLY, THE MINIMUM COVER SPECIFIED FOR A PROJECT ASSUMES H-20 ACCUMULATED SEDIMENT AND TRASH CAN TYPICALLY BE EVACUATED
THROUGH THE MANHOLE OVER THE OUTLET ORIFICE. IF MAINTENANCE IS NOT 9 0
LxAwxrcm LIVE LOAD. BECAUSE CONSTRUCTION LOADS OFTEN EXCEED DESIGN LIVE PERFORMED AS RECOMMENDED, SEDIMENT AND TRASH MAY ACCUMULATE IN _
LOADS, INCREASED TEMPORARY MINIMUM COVER REQUIREMENTS ARE FRONT OF THE OUTLET ORIFICE MANHOLE COVERS SHOULD BE SECURELY
NECESSARY SINCE CONSTRUCTION EQUIPMENT VARIES FROM JOB TO JOB, SEATEDFOLLOWING CLEANING ACTIVITIES. CONTECH SUGGESTS THATALL
IT IS BEST TO ADDRESS EQUIPMENT SPECIFIC MINIMUM COVER SYSTEMS BE DESIGNED WITH AN ACCESSIINSPECTION MANHOLE SITUATED AT
REQUIREMENTS WITH YOUR LOCAL CONTECH SALES ENGINEER DURING OR NEAR THE INLET AND THE OUTLET ORIFICE. SHOULD IT BE NECESSARY TO
GET INSIDE THE SYSTEM TO PERFORM MAINTENANCE ACTIVITIES, ALL
YOUR PRE -CONSTRUCTION MEETING. APPROPRIATE PRECAUTIONS REGARDING CONFINED SPACE ENTRYAND OSHA
REGULATIONS SHOULD BE FOLLOWED r
IF AASHTO TSS PROCEDURES ARE DETERMINED INFEASIBLE BY THE
GEOTECHNICAL ENGINEER OF RECORD, COMPACTION IS CONSIDERED
ADEQUATE WHEN NO FURTHER YIELDING OF THE MATERIAL IS OBSERVED
UNDER THE COMPACTOR. OR UNDER FOOT, AND THE GEOTECHNICAL
ENGINEER OF RECORD (OR REPRESENTATIVE THEREOF) IS SATISFIED WITH
THE LEVEL OF COMPACTION
THE RESISTIVITY OF A PROJECT SITE MAY CHANGEOVER TIME DUE TO THE USE FOR LARGE SYSTEMS, CONVEYOR SYSTEMS, BACKHOES WITH LONG
OF SALTING, DE-ICING, AND AGRICULTURALAGENTS APPLIED ON OR REACHE$OR DRAGLINES WITH STONE BUCKETS MAYBE USED TO PLACE
VARIOUS
NEAR THEAREA. TO MITIGATE THE POTENTIAL IMPACTOF THESEAGENTS,AN
BACKFILL ONCE MINIMUM COVER FOR CONSTRUCTION LOADING ACROSS
THE ENTIRE WIDTH OF THE SYSTEM IS REACHED, ADVANCE THE EQUIPMENT
HDPE MEMBRANE LINER WILL BE INSTALLED ON THE CROWN OF EACH PIPE,
TO THE END OF THE RECENTLY PLACED FILL. AND BEGIN THE SEQUENCE
v CREATING AN IMPERMEABLE BARRIER THIS MEASURE IS DESIGNED TO
AGAIN UNTIL THE SYSTEM IS COMPLETELY BACKFILLED. THIS TYPE OF
Y PROTECT THE SYSTEM FROM ENVIRONMENTAL CHANGESTHAT COULD LEAD TO
CONSTRUCTION SEQUENCE PROVIDES ROOM FOR STOCKPILED BACKFILL
G PRCLaATuwc CORROSION Auo RcouCC TIE OVERALL SERVICE ucc.
01RECTLY BEHIND THE BACKHOE, AS WELLAS THE MOVEMENT OF
CONSTRUCTION TRAFFIC. MATERIAL STOCKPILES ON TOP OF THE
BACKFILLED DETENTION SYSTEM SHOULD BE LIMITED TO & TO 10-FEET HIGH
F
AND MUST PROVIDE BALANCED LOADING ACROSS ALL BARRELS TO
DETERMINE THE PROPER COVER OVER THE PIPES TO ALLOW THE
MOVEMENT OF CONSTRUCTION EQUIPMENT SEE TABLE 1, OR CONTACT YOUR
LOCAL CONTECH SALES ENGINEER.
6�' w-
ADDITIONAL CONSIDERATIONS
BECAUSE MOST SYSTEMS ARE CONSTRUCTED BELOWGRADE. RAINFALL
CAN RAPIDLY FILL THE EXCAVATION; POTENTIALLY CAUSING FLOATATION
AND MOVEMENT OF THE PREVIOUSLY PLACED PIPES. TO HELP MITIGATE
POTENTIAL PROBLEMS, IT IS BEST TO START THE INSTALLATION AT THE
DOWNSTREAM END WITH THE OUTLETALREADY CONSTRUCTED TO ALLOW
A ROUTE FOR THE WATER TO ESCAPE TEMPORARY DIVERSION MEASURES
MAY BE REQUIRED FOR HIGH FLOWS DUE TO THE RESTRICTED NATURE OF
THE OUTLET PIPE.
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RINSED, INCLUDING ABOVE THE SPRING LINE SOON AFTER THE SPRING THAW
AS PART OF THE MAINTENANCE PROGRAM FOR THE SYSTEM.
MAINTAINING AN UNDERGROUND DETENTION OR INFILTRATION SYSTEM IS
EASIEST WHEN THERE IS NO FLOW ENTERING THE SYSTEM. FOR THIS
REASON, IT IS A GOOD IDEA TO SCHEDULE THE CLEANOUT DURING DRY
WEATHER.
THE FOREGOING INSPECTION AND MAINTENANCE EFFORTS HELP ENSURE
UNDERGROUND PIPE SYSTEMS USED FOR STORMWATER STORAGE CONTINUE
TO FUNCTION AS INTENDED BY IDENTIFYING RECOMMENDED REGULAR
INSPECTION AND MAINTENANCE PRACTICES. INSPECTION AND MAINTENANCE
RELATED TO THE STRUCTURAL INTEGRITY OF THE PIPE OR THE SOUNDNESS
OF PIPE JOINT GONNECTION515 BEYOND THE SCOPE OF THIS GUIDE.
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FABRICATION NOTES:
1. CONCRETE STRENGTH = 4,000 PSI
2. REINFORCING STEEL - ASTM A615, GRADE 60, OR EQUIVALENT WELDED WIRE FABRIC.
3. NICE LIGHT BROOM FINISH FOR UNITS W/ CAST -IN FRAME AND COVER
4. LIFTERS IN SIDE FOR UNITS W/ CAST -IN FRAME AND COVER AND LIFTERS IN TOP SLAB FOR
UNITS W/ SEPARATE COVER
GENERAL NOTES:
1. DESIGN LOAD HS20/HS25
2. EARTH COVER = 1' MAX
3. RISER CAP MUST BE ADEQUATELY SUPPORTED WITH PROPER BEDDING AND
BEARING PRESSURE OF 3350 PSF AS TO NOT TRANSFER LOADS ONTO RISER.
4. HEAVY PICK WEIGHT = 1,900 LBS
58" OD CMP RISER CAP
UP TO 36" RISERS
PRECASTER: SEALY, TX
DATE: 04/07/2021 1 SCALE: NONE I PROJECT No.: I SEQUENCE No.. I DRAWN: TJS
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CMP DETENTION INSTALLATION GUIDE
IN -SITU TRENCH WALL
PROPER INSTALLATION OF A FLEXIBLE UNDERGROUND DETENTION SYSTEM
IF EXCAVATION 15 REQUIRED, THE TRENCH WALL NEEDS TO BE CAPABLE OF
WHEN FLOWABLE FILL IS USED, YOU MUST PREVENT PIPE FLOATATION
WILL ENSURE LONG-TERM PERFORMANCE THE CONFIGURATION OF THESE
SUPPORTING THE LOAD THAT THE PIPE SHEDS AS THE SYSTEM IS LOADED IF
TYPICALLY, SMALL LIFTS ARE PLACED BETWEEN THE PIPES AND THEN
SYSTEMS OFTEN REQUIRES SPECIAL CONSTRUCTION PRACTICES THAT
SOILS ARE NOT CAPABLE OF SUPPORTING THESE LOADS. THE PIPE CAN
ALLOWED TO SET-UP PRIOR TO THE PLACEMENT OF THE NEXT LIFT THE
DIFFER FROM CONVENTIONAL FLEXIBLE PIPE CONSTRUCTION. CONTECH
DEFLECT. PERFORM A SIMPLE SOIL PRESSURE CHECK USING THE APPLIED
ALLOWABLE THICKNESS OF THE CLSM LIFT IS A FUNCTION OF A PROPER
ENGINEERED SOLUTIONS STRONGLY SUGGESTS SCHEDULING A
LOADS TO DETERMINE THE LIMITS OF EXCAVATION BEYOND THE SPRING LINE OF
BALANCE BETWEEN THE UPLIFT FORCE OF THE CLSM, THE OPPOSING
PRE -CONSTRUCTION MEETING WITH YOUR LOCAL SALES ENGINEER TO
THE OUTER MOST PIPES.
WEIGHT OF THE PIPE. AND THE EFFECT OF OTHER RESTRAINING
DETERMINE IF ADDITIONAL MEASURES, NOT COVERED IN THIS GUIDE, ARE
MEASURES THE PIPE CAN CARRY LIMITED FLUID PRESSURE WITHOUT
APPROPRIATE FOR YOUR SITE.
IN MOST CASES THE REQUIREMENTS FOR A SAFE WORK ENVIRONMENT AND
PROPER BACKFILL PLACEMENT AND COMPACTION TAKE CARE OF THIS CONCERN,
PIPE DISTORTION OR DISPLACEMENT, WHICH ALSO AFFECTS THE CLSM
LIFT THICKNESS YOUR LOCAL CONTECH SALES ENGINEER CAN HELP
DETERMINE THE PROPER LIFT THICKNESS
FOUNDATION
CONSTRUCT A FOUNDATION THAT CAN SUPPORT THE DESIGN LOADING
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APPLIEDTHE PIPE AND ADJACENT BACKFILL WEIGHT AS WELL AS MAINTAIN
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IS
ITS INTEGRITY DURING CONSTRUCTION
IF SOFT OR UNSUITABLE SOILS ARE ENCOUNTERED REMOVE THE POOR
SOILS DOWN TO A SUITABLE DEPTH AND THEN BUILD UP TO THE
as l— ESERoRA Tw
- 1 R,
APPROPRIATE ELEVATION WITH A COMPETENT BACKFILL MATERIAL THEuiD
STRUCTURAL FILL MATERIAL GRADATION SHOULD NOT ALLOW THE MIGRATION
SEEw
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OF FINES, WHICH CAN CAUSE SETTLEMENT OF THE DETENTION SYSTEM OR
PAVEMENTABOVE. IF THE STRUCTURAL FILL MATERIAL IS NOT COMPATIBLE
GIVNUARVID sNwER�
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WITH THE UNDERLYING SOILS AN ENGINEERING FABRIC SHOULD BE USED AS
weu.EDu �LE
ASEPARATOR IN SOME CASES, USING A STIFF REINFORCING GEOGRID
REDUCES OVER EXCAVATION AND REPLACEMENT FILL QUANTITIES
BACKFILL PLACEMENT
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GRADE THE FOUNDATION SUBGRADE TO A UNIFORM OR SLIGHTLY SLOPING
GRADE IF THE SUBGRADE IS CLAY OR RELATIVELY NONPOROUS AND THE
CONSTRUCTION SEQUENCE WILL LAST FORM EXTENDED PERIOD OF TIME,
IT IS BEST TO SLOPE THE GRADE TO ONE END OF THE SYSTEM THIS WILL
ALLOW EXCESS WATER TO DRAIN QUICKLY. PREVENTING SATURATION OF
THE SUBGRADE
MATERIAL SHALL BE WORKED INTO THE PIPE HAUNCHES BY MEANS OF
SHOVEL -SLICING, RODDING, MR TAMPER. VIBRATORY ROD. OR OTHER
EFFECTIVE METHODS.
IF AASHTO T99 PROCEDURES ARE DETERMINED INFEASIBLE BY THE
GEOFF CHNICAL ENGINEER OF RECORD. COMPACTION IS CONSIDERED
ADEQUATE WHEN NO FURTHER YIELDING OF THE MATERIAL IS OBSERVED
UNDER THE COMPACTOR, OR UNDER FOOT, AND THE GEOTECHNICAL
ENGINEER OF RECORD (OR REPRESENTATIVE THEREOF) IS SATISFIED WITH
THE LEVEL OF COMPACTION
GEOMEMBRANE BARRIER
ASITE'S RESISTIVITY MAY CHANGE OVER TIME WHEN VARIOUS TYPES OF
FOR LARGE SYSTEMS, CONVEYOR SYSTEMS, BACKHOES WITH LONG
SALTING AGENTS ARE USED, SUCH AS ROAD SALTS FOR DEICING AGENTS IF
9 SALTINGAGENTS ARE USED ON OR NEARTHE PROJECT SITE, A
REACHES OR DRAGLINES WITH STONE BUCKETS MAY BE USED TO PLACE
BACKFILL ONCE MINIMUM COVER FOR CONSTRUCTION LOADING ACROSS
GEOMEMBRANE BARRIER IS RECOMMENDED WITH THE SYSTEM THE
THE ENTIRE WIDTH OF THE SYSTEM I9 REACHED, ADVANCE THE EQUIPMENT
GEOMEMBRANE LINER IS INTENDED TO HELP PROTECT THE SYSTEM TO THE END OF THE RECENTLY PLACED FILL, AND BEGIN THE SEQUENCE
v POTENTIAL ADVERSE EFFECTS THAT MAY RESULT FROM THE USE OF SUCH
AGAIN UNTIL THE SYSTEM IS COMPLETELY BACKFILLED. THIS TYPE OF
AGENTS INCLUDING PREMATURE CORROSION AND REDUCED ACTUAL SERVICE
CONSTRUCTION SEQUENCE PROVIDES ROOM FOR STOCKPILED BACKFILL
LIFE
DIRECTLY BEHIND THE BACKHOE, AS WELL AS THE MOVEMENT OF
CONSTRUCTION TRAFFIC. MATERIAL STOCKPILES ON TOP OF THE
THE PROJECTS ENGINEER OF RECORD IS TO EVALUATE WHETHER SALTING
AGENTS WILL BE USED ON OR NEAR THE PROJECT SITE. AND USE HIS/HER
BACKFILLED DETENTION SYSTEM SHOULD BE LIMITED TO&TO 10-FEET HIGH
AND MUST PROVIDE BALANCED LOADING ACROSS ALL BARRELS. TO
BESTJUDGEMENTTO DETERMINE IF ANY ADDITIONAL PROTECTIVE
DETERMINE THE PROPER COVER OVER THE PIPES TO ALLOW THE
MEASURES ARE REQUIRED BELOW IS A TYPICAL DETAIL SHOWING THE
MOVEMENT OF CONSTRUCTION EQUIPMENT SEE TABLE 1. OR CONTACT
PLACEMENT OF A GEOMEMSRANE BARRIER FOR PROJECTS WHERE SALTING
YOUR LOCAL CONTECH SALES ENGINEER.
AGENTS ARE USED ON OR NEAR THE PROJECT SITE.
6
DATE
CAUTION NOTICE TO CONTRACTORS
P SSIBLE, MEASUREMENTS TASEN IN THE FIELD THE INFORMATION IS
N OF TO BE RELIED ON AS BEING EXACT OR COMPLETE THE
VATIO
QPROPOSEDI
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CMP DETENTION SYSTEM INSPECTION AND
MAINTENANCE
UNDERGROUND STORMWATER DETENTION AND WELL I RAI ION SYSTEMS MUST
BE INSPECTED AND MAINTAINED AT REGULAR INTERVALS FOR PURPOSES OF
PERFORMANCE AND LONGEVITY
INSPECTION
INSPECTION IS THE KEY TO EFFECTIVE MAINTENANCE OF CMP DETENTION
SYSTEMS AND 15 EASILY PERFORMED CONTECH RECOMMENDS ONGOING.
ANNUAL INSPECTIONS. SITES WITH HIGH TRASH LOAD OR SMALL OUTLET
CONTROL ORIFICES MAY NEED MORE FREQUENT INSPECTIONS, THE RATE AT
WHICH THE SYSTEM COLLECTS POLLUTANTS WILL DEPEND MORE ON SITE
SPECIFIC ACTIVITIES RATHER THAN THE SIZE OR CONFIGURATION OF THE
SYSTEM.
INSPECTIONS SHOULD BE PERFORMED MORE OFTEN IN EQUIPMENT
WASHDOWN AREAS. IN CLIMATES WHERE SANDING ANOIOR SALTING
OPERATIONS TAKE PLACE. AND IN OTHER VARIOUS INSTANCES IN WHICH ONE
WOULD EXPECT HIGHER ACCUMULATIONS OF SEDIMENT OR ABRASIVEI
CORROSIVE CONDITIONS. A RECORD OF EACH INSPECTION IS TO BE
MAINTAINED FOR THE LIFE OF THE SYSTEM
MAINTENANCE
CMP DETENTION SYSTEMS SHOULD BE CLEANED WHEN AN INSPECTION
REVEALS ACCUMULATED SEDIMENT OR TRASH IS CLOGGING THE DISCHARGE
ORIFICE
ACCUMULATED SEDIMENT AND TRASH CAN TYPICALLY BE EVACUATED
CONSTRUCTION LOADING THROUGH THE MANHOLE OVER THE OUTLET ORIFICE. IF MAINTENANCE IS NOT
TYPICALLY. THE MINIMUM COVER SPECIFIED FOR A PROJECT ASSUMES H-20 PERFORMED AS RECOMMENDED, SEDIMENT AND TRASH MAY ACCUMULATE IN
LIVE LOAD. BECAUSE CONSTRUCTION LOADS OFTEN EXCEED DESIGN LIVE FRONT OF THE OUTLET ORIFICE. MANHOLE COVERS SHOULD BE SECURELY
LOADS, INCREASED TEMPORARY MINIMUM COVER REQUIREMENTS ARE SEATEDFOLLOWING CLEANING ACTIVITIES. CONTECH SUGGESTS THAT ALL
NECESSARY SINCE CONSTRUCTION EQUIPMENT VARIES FROM JOB TO JOB, SYSTEMS BE DESIGNEDWITHAN ACCESS/INSPECTION MANHOLE SITUATED AT
IT IS BEST TO ADDRESS EQUIPMENT SPECIFIC MINIMUM COVER OR NEAR THE INLET NO THE OUTLET ORIFICE. SHOULD IT BE NECESSARY TO
REQUIREMENTS WITH YOUR LOCAL CONTECH SALES ENGINEER DURING GET INSIDE THE SYSTEMM TO PERFORM MAINTENANCE ACTIVITIES, ALL
APPROPRIATE PRECAUTIONS REGARDING CONFINED SPACE ENTRY AND,
YOUR PRE -CONSTRUCTION MEETING. OSHA REGULATIONS SHOVED BE FOLLOWED.
ADDITIONAL CONSIDERATIONS
BECAUSE MOST SYSTEMS ARE CONSTRUCTED BELOW -GRADE, RAINFALL
CAN RAPIDLY FILL THE EXCAVATION; POTENTIALLY CAUSING FLOATATION
AND MOVEMENT OF THE PREVIOUSLY PLACED PIPES TO HELP MITIGATE
POTENTIAL PROBLEMS, IT IS BEST TO START THE INSTALLATION AT THE
DOWNSTREAM END WITH THE OUTLET ALREADY CONSTRUCTED TO ALLOW
A ROUTE FOR THE WATER TO ESCAPE. TEMPORARY DIVERSION MEASURES
MAY BE REQUIRED FOR HIGH FLOWS DUE TO THE RESTRICTED NATURE OF
THE OUTLET PIPE.
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ANNUAL INSPECTIONS ARE BEST PRACTICE FOR ALL UNDERGROUND
SYSTEMS. DURING THIS INSPECTION, IF EVIDENCE OF SALTINGIDE-ICING
AGENTS IS OBSERVED WITHIN THE SYSTEM, IT IS BEST PRACTICE FOR THE
SYSTEM TO BE RINSED. INCLUDING ABOVE THE SPRING LINE SOON AFTER THE
SPRING THAW AS PART OF THE MAINTENANCE PROGRAM FOR THE SYSTEM.
MAINTAINING AN UNDERGROUND DETENTION OR INFILTRATION SYSTEM IS
EASIEST WHEN THERE IS NO FLOW ENTERING THE SYSTEM FOR THIS
REASON, IT IS A GOOD IDEA TO SCHEDULE THE CLEANOUT DURING DRY
WEATHER
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URBAN FORESTRY PLAN CALCULATIONS
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VICINITY MAP
CITY OF FORT WORTH URBAN FORESTRY NOTES
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CITY OF FORT WORTH URBAN FORESTRY NOTES
INSPECT oFOR.OMPLI=' LN L ,HE INS— Dry HAS FEE. lma
NO PERSON SHALL REMOVE OR DAMAGE ANY ,RRE EQU TO OR
ES(e�)DLAMETER AT BREZTHEIGHTWITCONILIANCE HOUTMURET' REM.— may:
OPMAGE COULD RESULT IN BOTH CIVIL AND CRIMINAL
TREE PROTECTION GENERAL NOTES
Inl TREEPERMR HAS NOT SEEN ISSUED AND SHALT ERECT SARIENS FOR THE MRO,eCrIOry OE THE
(,ILLOWING
R PRO
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(3) ARAN AREA AT OR GREATIR—N -O-IHIRDS OF THE DRIPLINE OF ALL OTHER
(B) NSCRE*1 TO ANY PROTECT' COULD PRONE HARMFUL TO THE PROTECTED TREI
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THEOUTSH.ETHEwN�DRIPLI. rOR allo HE NEARBY GRourvDOP,
TREESv HCH IS TO BE PRESERRED WITHIN THE OHTSIOE PERI ETER HE R N( ESPBYE)oFANVTR
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(F) PRIOR TO IS
SUNGA CERTIFICATE OFOccuPAN YORCOSTROYEDMPLInrvcEFORANYOEVELOPmENT.BU LDNGORS MC—E.—TREES
FEOIVALENTDMu RRAABREASTHEIGT,EEOC IERANDDFOTON,HESuae SPECIRER SPECFEC vo HE TY REORE
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SUCH THAT THEY ARE MADE SUSCEPTIBLE TO INSECT ATTACK PREV,3,TATIVE SPRAYING OF THESE TREES BY THE CONTRACTOR MAY BE
EVE uP SHEET
UFP-1
Exhibit "C"
CITY OF FORT WORTH STORMWATER FACILITY OPERATION AND
MAINTENANCE PLAN FOR UNDERGROUND FACILITIES
The only responsibility the City of Fort Worth has in the operation and maintenance of this
Facility is inspection.
General Maintenance Procedures
The structural and functional integrity of the Facility shall be maintained at all times by
removing and preventing drainage interference, obstructions, blockages, or other adverse
effects into, through, or out of the system.
Periodic silt removal shall occur when standing water conditions occur or the facilities
storage volume is reduced by more than 10%. Silt shall be removed and the facility returned
to original working condition of the lines and grades shown on the approved engineering
plans. In addition, corrective measures are required any time a facility does not drain
completely within 72 hours of cessation of inflow. NO STANDING WATER IS
ALLOWED in the underground facility designed for dry detention purposes.
Accumulated litter, sediment, and debris shall be removed every 6 months or as necessary
to maintain proper operation of the facility. Disposal shall be in accordance with federal,
state and local regulations.
To prevent debris from entering and clogging the downstream storm sewer system a wire
mesh screen or similar screening device shall be installed over the outlet until final
acceptance.
4. PREVENTIVE MAINTENANCE/INSPECTION
Visual inspections of all components will be conducted every 6 months.
A log shall be kept of maintenance actions, and inspections. The log should
document the condition of the detention system's primary components, silt, litter
and debris removal dates.
• Written maintenance and repair records shall be maintained by the party or
parties signing the attached Agreement and shall be provided to the City upon
request.
STORMWATER UNDERGROUND FACILITY MAINTENANCE AGREEMENT
Underground stormwater detention and infiltration systems must
be inspected and maintained at regular intervals for purposes of
performance and longevity.
Inspection
Inspection is the key to effective maintenance of CMP detention
systems and is easily performed. Contech recommends ongoing,
quarterly inspections. The rate at which the system collects pollutants
will depend more on site specific activities rather than the size or
configuration of the system.
Inspections should be performed more often in equipment washdown
areas, in climates where sanding and/or salting operations take
place, and in other various instances in which one would expect
higher accumulations of sediment or abrasive/corrosive conditions. A
record of each inspection is to be maintained for the life of the system.
NOTHING IN THIS CATALOG SHOULD BE CONSTRUED AS A WARRANTY. APPLICATIONS
SUGGESTED HEREIN ARE DESCRIBED ONLY TO HELP READERS MAKE THEIR OWN EVALUATIONS
AND DECISIONS, AND ARE NEITHER GUARANTEES NOR WARRANTIES OF SUITABILITY FOR ANY
APPLICATION. CONTECH MAKES NO WARRANTY WHATSOEVER, EXPRESS OR IMPLIED, RELATED
TO THE APPLICATIONS, MATERIALS, COATINGS, OR PRODUCTS DISCUSSED HEREIN. ALL IMPLIED
WARRANTIES OF MERCHANTABILITY AND ALL IMPLIED WARRANTIES OF FITNESS FOR ANY
PARTICULAR PURPOSE ARE DISCLAIMED BY CONTECH. SEE CONTECH'S CONDITIONS OF SALE
(AVAILABLE AT WWW.CONTECHES.COM/COS) FOR MORE INFORMATION
CMP MAINTENANCE GUIDE 2/17 PDF
Maintenance
CMP detention systems should be cleaned when an inspection reveals
accumulated sediment or trash is clogging the discharge orifice.
Accumulated sediment and trash can typically be evacuated through
the manhole over the outlet orifice. If maintenance is not performed
as recommended, sediment and trash may accumulate in front of the
outlet orifice. Manhole covers should be securely seated following
cleaning activities. Contech suggests that all systems be designed with
an access/inspection manhole situated at or near the inlet and the
outlet orifice. Should it be necessary to get inside the system to perform
maintenance activities, all appropriate precautions regarding confined
space entry and OSHA regulations should be followed.
Systems are to be rinsed, including above the spring line, annually
soon after the spring thaw, and after any additional use of salting
agents, as part of the maintenance program for all systems where
salting agents may accumulate inside the pipe.
Maintaining an underground detention or infiltration system is easiest
when there is no flow entering the system. For this reason, it is a good
idea to schedule the cleanout during dry weather.
The foregoing inspection and maintenance efforts help ensure
underground pipe systems used for stormwater storage continue to
function as intended by identifying recommended regular inspection
and maintenance practices. Inspection and maintenance related
to the structural integrity of the pipe or the soundness of pipe joint
connections is beyond the scope of this guide.
i �1►�i� � r� A
CMP DETENTION SYSTEMS
C=:I N T E C H'
ENGINEERED SOLUTIONS
NC$?A 02017 Contech Engineered Solutions LLC
All rights reserved. Printed in USA.
FORT WO RT H Fort Worth °CS
Stormwater
Management
" EXHIBIT D"
STORMWATER UNDERGROUND DETENTION FACILITY MAINTENANCE CHECKLIST
FREQUENT INSPECTION
Inspection Item: Date: Repairs Required: Repairs Made: Notes:
Remove: Trash and
Debris
Remove: Grass
Clippings, Leaves, Etc.
MINOR INSPECTION:
Inspection Item: Date: Repairs Required: Repairs Made: Notes:
Condition of
Underground Facility
Amount of Silt in
Facility
Amount of Ponded
Water in Facility
MAJOR INSPECTION:
Inspection Item: Date: Repairs Required: Repairs Made: Notes:
Type / Condition of
Outfall Structure
Size and Condition of
Outfall Pipe
Evidence of Roots
Infiltrating the Facility
Evidence of
subsidence around
facility