HomeMy WebLinkAboutOM ManualStormwater Infrastructure
Operations and Maintenance Manual
Carmel Clay Schools – Carmel High School
Performing Arts Addition and Renovations
520 E. Main Street
Carmel, Indiana
Owner:
Carmel Clay Schools
5201 E. Main Street
Carmel, Indiana 46033
TLF Project 2020-193
March 9, 2021
Revised: May 10, 2021
TLF#2020-193 9-March-2021
(Revised 10-May-2021)
TLF, Inc.
3901 West 86th Street
Indianapolis, IN 46268
Phone (317) 334-1500
Fax (317) 334-1552
TABLE OF CONTENTS
I. Owner Information
II. Site Information
III. BMP Owner Acknowledgement Agreement
IV. Storm Sewer Structure Maintenance
V. Storm Sewer Pipe Maintenance
VI. Cascade Separator (Hydrodynamic Separator) Maintenance
VII. Site Diagrams and Stormwater Details
VIII. Inspection and Maintenance Schedule
IX. Sample Inspection Checklists
a. Storm Sewer Structure Inspection Checklist
b. Storm Sewer Pipe Inspection Checklist
c. Cascade Separator (Hydrodynamic Separator) Inspection Checklist
TLF#2020-193 9-March-2021
(Revised 10-May-2021)
I - OWNER INFORMATION
BMP Owner Name: Carmel Clay Schools
5201 E. Main Street
Carmel, Indiana 46033
Contact: TBD
General Information
The purpose of water quality Best Management Practices (BMPs) is to filter the first flush of
rainwater before it enters the downstream lakes and streams. Through the use of these BMPs,
the sediment and pollutant load in stormwater runoff is reduced, and in many cases the
quantity of stormwater runoff generated is also reduced. The use of BMPs also helps to reduce
hydrocarbons, trash, and debris from entering waterways.
Owner Responsibility
The BMP Owner shall be responsible for all maintenance and costs associated with the
proposed BMPs. In addition, it is the owner’s responsibility to perform and/or pay for
inspections and maintenance as recommended below.
Right of Entry
City of Carmel representatives have the right to enter the property to inspect and, if required,
maintain the BMPs at any time.
Annual Inspection Reports
Annual inspection reports shall be submitted to the City of Carmel for each BMP. The first
report is due one year after construction is completed, with subsequent reports due each year
within the same month of the initial report. If there are any discrepancies found during the
inspection, these should be addressed. If the inspection report is not received within the
month it is due, if there are deficiencies which were not included in the report, or if any
deficiencies included in the report are not addressed in a timely manner, the BMP owner faces
enforcement action from the City of Carmel.
TLF#2020-193 9-March-2021
(Revised 10-May-2021)
II – SITE INFORMATION
The site contains a Best Management Practices (BMP) for the purpose of sediment removal.
The Mechanical BMP and Underground Detention System are located at the northern portion
of the project site.
City of Carmel will require annual inspection reports of the water quality BMPs.
LOCATION MAP
TLF#2020-193 9-March-2021
(Revised 10-May-2021)
III – BMP OWNER ACKNOWLEDGEMENT AGREEMENT
Owner Acknowledgement Agreement (“Agreement”)
For good and valuable consideration, the receipt and sufficiency of which are hereby
acknowledged, the undersigned owner (“Owner”) hereby submits this Operation and
Maintenance Manual (“Manual”) to the City of Carmel, Indiana (“City”) as a written
acknowledgement of Owner’s warranty and agreement to institute, maintain, and follow
the water quality Best Management Practices (“BMPs”) listed below, and to follow and
abide by the inspection schedule and maintenance activities listed in this Manual. The
Owner also hereby agrees to provide, at Owner’s cost, all additional maintenance, repair,
and/or replacement services reasonably necessary to maintain the function and longevity
of the BMPs from and including the date this Agreement is executed by Owner to and
including the date on which a new Agreement is filed with the City by another party who
assumes all of the obligations and responsibilities of Owner as set forth herein.
BMPs: ___________________________________________________
___________________________________________________
___________________________________________________
_______________________________ ________________________
Owner Signature Date
_______________________________ ______________________________
Printed Name Company
STATE OF INDIANA )
) SS:
COUNTY OF HAMILTON )
BEFORE ME, the undersigned, a Notary Public in and for said County and State,
personally appeared _________________________________ Owner subscribed and
sworn before this ____ day of __________________, ________.
______________________________ ______________________________
County of Residence Signature
______________________________
Commission Expiration Date
______________________________
Printed Name
Contech Cascade Model CS-5
TLF#2020-193 9-March-2021
(Revised 10-May-2021)
IV – STORM SEWER STRUCTURE MAINTENANCE
Storm structures are set at storm sewer pipe connections. Unless you have OSHA approved
training and equipment, never enter a manhole.
Inspection
All inlet castings should be inspected monthly and after each rainfall event. More frequent
inspections should be performed in areas where there is higher potential for trash or litter and
during the fall when leaves are present on the ground. Check the frame and lid for cracks and
wear, such as rocking lids or lids moved by traffic.
Storm structures and the surrounding areas should be inspected annually for pollutants such as
leaks from dumpsters, minor spills, and oil dumping. Take action to have the pollutant source
removed.
Cleaning
Clean structures when there is a blockage of a water flow path or when sediment depth
reaches 6”. Cleaning should be performed in a way that ensures removed sediment and water
is not discharged back into the storm sewer.
Safety
Work inside underground structures requires special OSHA-required confined space equipment
and procedures. The most practical option may be to contract with a sewer cleaning
contractor.
Materials Handling
Disposal of waste from maintenance of drainage facilities shall be conducted in accordance
with federal, state, and local regulations. Removed sediment must be disposed in the garbage
as a solid waste. Water should be disposed of in a sanitary sewer after oils are removed using
oil absorbent materials or other mechanical means. Used oil absorbents should be recycled or
disposed according to the manufacturer’s instructions.
Repairs
Repair all security and access features so they are fully functional. This includes locking lids,
covers, and ladder rungs. Replace broken parts or lids that rock or are moved by traffic.
TLF#2020-193 9-March-2021
(Revised 10-May-2021)
V – STORM SEWER PIPE MAINTENANCE
Storm sewer pipes convey stormwater. Pipes are built from many materials and are sometimes
perforated to allow stormwater to infiltrate into the ground. Storm pipes are cleaned to
remove sediment or blockages when problems are identified. Storm pipes must be clear of
obstructions and breaks to prevent localized flooding.
Inspection
Pipes are difficult to inspect requiring special equipment and training. Usually, if a problem
occurs, the owner needs to call a sewer or plumbing contractor to inspect, repair, or clean
pipes.
Cleaning
Clean pipes when sediment depth is greater than ¼ of the pipe diameter, with a maximum
sediment depth of 6”. When cleaning a pipe, minimize sediment and debris discharges from
pipes to the storm sewer. Install downstream debris traps (where applicable) before cleaning
and then remove material. Generally, use mechanical methods to remove root obstructions
from inside storm sewer pipes. Do not put root-dissolving chemicals in storm sewer pipes. If
there is a problem, remove the vegetation over the line.
Safety
Work inside underground structures requires special OSHA-required confined space equipment
and procedures. The most practical option may be to contract with a sewer cleaning
contractor.
Materials Handling
Disposal of waste from maintenance of drainage facilities shall be conducted in accordance
with federal, state, and local regulations. Removed sediment must be disposed in the garbage
as a solid waste. Water should be disposed of in a sanitary sewer after oils are removed using
oil absorbent materials or other mechanical means. Used oil absorbents should be recycled or
disposed according to the manufacturer’s instructions.
Repairs
Repair or replace pipes when a dent or break closes more than 20 percent of the pipe diameter.
Repair or replace pipes damaged by deterioration.
TLF#2020-193 9-March-2021
(Revised 10-May-2021)
VI – HYDRODYNAMIC SEPARATOR MAINTENANCE
This site contains one Cascade Separator BMP structure. Cascade Separators are designed to
remove sediment, debris, and free oil from entering the sewer system. After construction, the
Cascade Separator structure should be inspected every six months and cleaned as needed or
once a year regardless of whether it has reached full pollutant storage capacity. Disposal of all
sediment, in addition to local requirements, must be in accordance with all federal and state
requirements. See the attached manufacture O&M Manual for complete details of inspection
and cleaning.
Inspection
Inspect the unit every six months. The inspection should determine sediment depth,
accumulation of trash and litter, and the specific maintenance and repairs needed. Annually
check for cracks large enough to let soil enter the vault, broken or defective plates and baffles,
and crushed or damaged pipes.
Cleaning
Remove trash and litter from the vault, inlet, and piping when present. Remove sediment
when it accumulates to 7” or per the manufacturer’s maximum recommended depth. Cleaning
should be performed in a way that ensures removed sediment and water is not discharged back
into the storm sewer.
Safety
Work inside underground structures requires special OSHA-required confined space equipment
and procedures. The most practical option may be to contract with a sewer cleaning
contractor.
Materials Handling
Disposal of waste from maintenance of drainage facilities shall be conducted in accordance
with federal, state, and local regulations. Removed sediment must be disposed in the garbage
as a solid waste. Water should be disposed of in a sanitary sewer after oils are removed using
oil absorbent materials or other mechanical means. Used oil absorbents should be recycled or
disposed according to the manufacturer’s instructions.
Repairs
Repair any cracked or defective plates or baffles. Repair all security and access features so they
are fully functional. This includes locking lids, covers, and ladder rungs. Replace broken parts
or lids that rock or are moved by traff
TLF#2020-193 9-March-2021
(Revised 10-May-2021)
VII – SITE DIAGRAMS AND STORMWATER DETAILS
TBM#1 = 856.00
E MAIN STREET
LOT 1
LOT 48
PROPOSED BUILDING ADDITION
18,240 SFT.
FINISH FLOOR ELEV. = 851.55 (EAST)
FINISH FLOOR ELEV. = 852.89 (WEST)
FIRE LANE NO PARKING FIRE LANE NO PARKING FIRE LANE NO PARKINGSANSAN
SANST-202
ST-204 ST-206
ST-201
ST-209
ST-208
ST-207
ST-203
ST-205
4
3
5
555
36 L.F.
8
9 10
11
2
12
CONNECT TO EXISTING MANHOLE
@ INVERT ELEV. 845.61
5
5 1
1
4
3
5
4
3
5
11 L.F.
12 L.F.
22 L.F.
4 L.F.
19 L.F.
57 L.F.
27 L.F.
6
7
13
14
15 14
15
16
17
12
20 6002040
STORM WATER QUALITY UNIT (CONTECH
CASCADE MODEL CS-5)
FOR PIPE LOCATED IN AND
WITHIN 5' OF PAVED AREAS
FOR PIPE LOCATED
IN GRASSED AREAS
STORM SEWER (PVC & HDPE) TRENCH DETAIL
NO SCALE
NOTES:
1.ALL BEDDING & INITIAL BACKFILL
SHALL BE INSTALLED IN 6" TO 12"
BALANCED LIFTS.
2.A MIN. 9" CLEARANCE EACH SIDE
OR PIPE FOR 42" DIA. AND LESS.
Bc MIN.4"12"MIN. 1.25 O.D.+12"
MIN. 6" TOPSOIL
OUTSIDE PAVEMENT LIMITS
PAVEMENT SECTION
REGULAR BACKFILL -
GREATER THAN 5' FROM
EDGE OF PAVEMENT
COMPACTED 90%
REGULAR BACKFILL-
GREATER THAN 5' FROM
EDGE OF PAVEMENT
COMPACTED TO 90%
#8 CRUSHED STONE OR
EQUIVALENT CLASS 1
MATERIAL HAND TAMPED
OR WALKED INTO PLACE
"B" BORROW (INDOT SPEC.) OR
EQUIVALENT GRANULAR
MATERIAL COMPACTED TO 95%
STANDARD PROCTER DENSITY
20 L.F. (MIN,)20 L.F. (MIN,)20 L.F. (MIN,)2
0
L
.
F
.
(M
I
N
,
)2'-0"VARIES4" DIA. PERF.
PVC SDR-35 PIPE
1'-0"4"NON WOVEN
FILTER CLOTH
#8 WASHED
AGGREGATE
COMPACTED AGGREGATE BASE
PAVEMENT
CURB INLET
NOTES:
1.TAP STRUCTURES IN PAVEMENT AS SHOWN
OR AS DIRECTED ON THE PLAN SHEET
2.ADJUST UNDERDRAIN AS REQUIRED TO
AVOID SEWER LINES AND OTHER UTILITIES.
3.GROUT SOLID THE CONNECTION TO STORM
STRUCTURE
PAVEMENT UNDERDRAIN DETAIL
NONE
STORM SEWER / WATER LINE CROSSING DETAIL
NONE1/6 Bc3"
4"
6"
LEGEND
MATERIAL BELOW PIPE
d = DEPTH OF BEDDING
D = INSIDE DIAMETER
Bc = OUTSIDE DIAMETER
30" TO 60"
27" & SMALLER
66" & LARGER
D (d) MIN.
3/4" = 1'-0"
DEPTH OF BEDDING
MATERIAL BELOW PIPE
NOTES:
1.ALL BEDDING & INITIAL BACKFILL
SHALL BE INSTALLED IN 6" TO 12"
BALANCED LIFTS.
2.A MIN. 9" CLEARANCE EACH SIDE
OR PIPE FOR 42" DIA. AND LESS.
REGULAR BACKFILL -
GREATER THAN 5' FROM EDGE
OF PAVEMENT COMPACTED 90%
MIN. 1.25 O.D.+12"
FOR PIPE LOCATED IN AND
WITHIN 5' OF PAVED AREAS
FOR PIPE LOCATED
IN GRASSED AREAS
Bc
MIN. 6" TOPSOIL
IN NON-PAVED AREAS
PAVEMENT SECTION
"B" BORROW (INDOT SPEC.) OR
EQUIVALENET GRANULAR
MATERIAL COMPACTED TO 95%
STANDARD PROCTER DENSITY
"B" BORROW (INDOT SPEC.) OR
EQUIVALENET GRANULAR
MATERIAL COMPACTED TO 95%
STANDARD PROCTER DENSITY dSTORM SEWER (RCP) TRENCH DETAIL
SLOPE
MIN.
NOTE: CLEANOUTS IN PAVED AREAS TO BE ACCESSIBLE VIA YARD
BOXES OR EXTENDED FLUSH WITH THE PAVING. CO VER SHOULD BE
THREADED TYPE, WATER TIGHT AND CAPPED.
1/2" = 1'-0"
CLEANOUT DETAILVARIESFINISH GRADE
STORM OR SANITARY SEWER
(SIZE SHOWN ON PLANS)
SAME SIZE AS MAIN LINE
(MAX. 8" REQUIRED ON STORM SEWERS)
1'-0"1'-0"
MIN.6"1/2"HEAVY DUTY CLEANOUT
CASTING - JAY R. SMITH 4253
SERIES OR EQUAL
CONCRETE COLLAR
(CONCRETE SHALL NOT
BE IN CONTACT w/ PIPE)
30"
72"
60"
102"
108"
96"
6"
7"
9"
9"
SEE SCHEDULE
FOR CASTING TYPE
AND ELEVATIONFINISH
GRADE
STORM MANHOLE TYPE "J - N" DETAIL
1/2" = 1'-0"
24" DIA.
PRECAST CONCRETE
ADJUSTING RING
4" MIN. - 12" MAX.
SEE DETAIL
PLASTIC ENCAPSULATED
STEEL MANHOLE STEPS
48" DIA.
STANDARD PRECAST
MANHOLE CAP OR CONE
3" MIN.6'-0" MIN.9"8"MIN.3" MIN.16"TYP.5"5"
CONCRETE REDUCER CAP
1/2" PER FOOT SLOPE
BASE SET ON 6" OF
#8 OR #2 STONE
COMPACTED
SUBGRADE
DIA. "F"
"H""H"1'-0" MIN. OVER
HIGHEST PIPE
DIA. "
G"
ONE COMPLETE UNIT OF PRECAST
CONC. MANHOLE BASE AND RISER.
SEPARATE BASE IS OPTIONAL
NOTES:
MANHOLE CONFORMS TO ASTM C478.
JOINTS CONFORM TO ASTM C443.
NO BRICK OR BLOCK WILL BE
ALLOWED IN MANHOLE.
MANHOLE
TYPE
"J"
"K"
"L"
"M"
"N"
MANHOLE
DIA "F"
MAX. PIPE SIZE
@ 90° - DIA "G"
"H" - WALL
THICKNESS
36"
48"
60"
72"9"
MAX. PIPE SIZE
MAINLINE - DIA "G"
36"
48"
54"
72"
84"
TLF#2020-193 9-March-2021
(Revised 10-May-2021)
VIII – INSPECTION AND MAINTENANCE SCHEDULE
Structure/BMP Inspection Maintenance
Storm Structure Casting Monthly & after rain events 6” of sediment accumulation
Storm Structure Sump Annually & after heavy rain
events
6” of sediment accumulation
Storm Sewer Pipe When problems occur 6” of sediment accumulation
Hydrodynamic Separator Every 6 months 7” of sediment accumulation
TLF#2020-193 9-March-2021
(Revised 10-May-2021)
IX – SAMPLE INSPECTION CHECKLISTS
Storm Sewer Structure Operation, Maintenance, and Management Inspection Checklist for BMP Owners
Project: _________________________________Owner Change since last inspection? Y N
Owner Name, Address, Phone: ___________________________________________________________
Number: _____________________________________________________________________________
Location: _____________________________________________________________________________
Site Status _________________________________
Date: ________________________
Time: ________________________
Inspector: ____________________________________________________________________________
Maintenance Item Satisfactory/
Unsatisfactory
Comments
Storm Casting and Grate (Inspect monthly and after major storms)
1. Trash/Debris obstructing inflow
Affected Structures:
2. Silt/Sediment accumulation
Affected Pipes:
3. Other (describe)
Structure Sump (Inspect annually and after major storms)
1. Sediment/Debris in sump
Affected Structures:
2. Other (describe)
Headwall Structures (Inspect annually and after major storms)
1. Vegetation around headwall
2. Erosion around headwall
3. Animal burrows
4. Headwall clear of obstructions
5. Sediment Accumulation
Affected Structures:
6. Other (describe)
Additional Comments:
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
Actions to be taken:
Timeframe:
Storm Sewer Pipes Operation, Maintenance, and Management Inspection Checklist for BMP Owners
Project: _________________________________Owner Change since last inspection? Y N
Owner Name, Address, Phone: ___________________________________________________________
Number: _____________________________________________________________________________
Location: _____________________________________________________________________________
Site Status _________________________________
Date: ________________________
Time: ________________________
Inspector: ____________________________________________________________________________
Maintenance Item Satisfactory/
Unsatisfactory
Comments
Storm sewer pipes (Inspect annually and after major storms)
1. Trash/Debris obstructing inflow
Affected Pipes:
2. Silt/Sediment accumulation
Affected Pipes:
3. Other (describe)
Additional Comments:
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
Actions to be taken:
Timeframe:
Cascade Separator Water Quality Structure Operation, Maintenance, and Management Inspection
Checklist for BMP Owners
Project: _________________________________Owner Change since last inspection? Y N
Owner Name, Address, Phone: ___________________________________________________________
Number: _____________________________________________________________________________
Location: _____________________________________________________________________________
Site Status: _________________________________
Date: ________________________
Time: ________________________
Inspector: ____________________________________________________________________________
Maintenance Item Satisfactory/
Unsatisfactory
Comments
Cascade Separator (Inspect quarterly and after major storms)
1. Condition of Structure
2. Trash/Debris obstructing inflow
Affected Structures:
3. Silt/Sediment accumulation
Affected Pipes:
4. Other (describe)
Filtration Chamber (Cleaned annually at a minimum)
1. Condition of Chamber
2. Sediment/Debris in sediment chamber
pumped and unit is pressure washed
3. Other (describe)
Additional Comments:
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
Actions to be taken:
Timeframe: