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LAND DEVELOPMENT CONSULTANTS
DRAINAGE CONSULTANTS
CERTIFIED FLOODPLAIN MANAGER
14020 Mississinewa Drive Carmel, Indiana 46033 Phone: 317.324.8695 www.Fritz-Eng.com
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OPERATIONS & MAINTENANCE MANUAL
FOR POST CONSTRUCTION
STORMWATER MEASURES
LAKEFRONT COURT 2
Project Location:
SW CORNER OF LAKEFRONT COURT AND CARMEL DRIVE
LOT 2 CARMEL SCIENCE & TECHNOLOGY PARK
CARMEL, IN 46032
Prepared For:
DAVID RAUSCH STUDIO
170 S. Main Street
Zionsville, IN 46077
Date:
July 7, 2022
Last Revised:
TABLE OF CONTENTS
TABLE OF CONTENTS .................................................................................................. 2
SECTION 1 - OWNER INFORMATION ........................................................................... 3
BMP OWNER 3
SECTION 2 - SITE INFORMATION ................................................................................ 4
PROJECT DESCRIPTION 4
BMP TYPE 5
INFILTRATION BASIN Error! Bookmark not defined.
STORMWATER INLETS AND MANHOLES 5
FEMA MAP OVERVIEW 5
WATERSHED DESCRIPTION 5
SOILS OVERVIEW 5
TABLE 1 – PROJECT SOILS 5
ZONING INFORMATION 6
DEVELOPMENT STANDARDS 6
STORMWATER QUALITY CALCULATIONS 6
SECTION III - INLET MAINTENANCE ............................................................................ 8
SECTION IV - CONVEYANCES MAINTENANCE ........................................................... 8
SECTION V - INFILTRATION SYSTEM MAINTENANCE ............................................... 8
SECTION VI - WATER QUALITY SYSTEM MAINTENANCE ........................................ 10
BMP MAINTENANCE 10
APPENDIX A – BMP LOCATION MAP
APPENDIX B – INFILTRATION BASIN MAINTENANCE & DETAILS
APPENDIX C – INLET MAINTENANCE & DETAILS
APPENDIX D – CONVEYANCE MAINTENANCE & DETAILS
SECTION 1 - OWNER INFORMATION
BMP OWNER
RMBC Investments
Dr. Ron Miller & Dr. Burke Chegar
715 West Carmel, Drive
Carmel, IN 46032
317-844-6284
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: AquaSwirl XC-4
_______________________________ ________________________
Owner Signature Date
_______________________________ ______________________________
Printed Name Company
STATE OF INDIANA )
) SS:
COUNTY OF __________ )
Before me, the undersigned notary public, on this day of ,
20 personally appeared and being duly sworn,
acknowledged the execution of the above.
___________________________________
(Notary Public - Signature)
SEAL
___________________________________
(Notary Public - Printed)
My Commission Expires: ______________.
Residing in ___________________ County.
SECTION 2 - SITE INFORMATION
PROJECT DESCRIPTION
RMBC Investments is proposing a new commercial medical office facility at the on the
southwest corner of Carmel Drive and Lakefront Court, commonly known as Lot 2 of Block
11 Carmel Science & Technology Park in Carmel, Indiana. The facility will consist of a
new building of approximately 8,000 sf, single story, with associated parking and utility
service improvements. Access to the site will be provided from Lakefront Court along the
southwestern corner of the site.
For reference, the project site is located at approximately latitude 39°57’53''N and
longitude 86º08’35”W.
Stormwater runoff form the development will be collected and conveyed by new onsite
stormwater inlets and pipes through a stormwater BMP and connect to the existing
stormwater pipe network within Lakefront Court to the east of the site. From there, the
stormwater is conveyed south via existing storm sewer pipes, passes through an
additional existing mechanical stormwater BMP and discharges into the existing pond east
of Lakefront Court.
Urban stormwater runoff contains many types and forms of pollutants. When compared to
stormwater runoff under predevelopment conditions, higher concentrations and some
contaminants that are not naturally present in surface runoff from undeveloped local lands
are found. Runoff from undeveloped watersheds contains sediment particles, oxygen-
demanding compounds, nutrients, metals, bacteria, and other constituents. Once
developed, constituent loads increase because surface runoff volumes increase and the
sources of many of these pollutants both increase and have more direct runoff routes to
drainage systems. The use of some chemicals, such as fertilizers, increases the
availability of potential pollutants to stormwater runoff.
Runoff water quality in urban areas can be extremely detrimental to local aquatic and
riparian habitat. Paved surfaces and standing water bodies for stormwater management
control elevate the temperature of water entering streams. Chemicals in standing water
and ponds are oxidized, resulting in depressed levels of dissolved oxygen. Increased
runoff volumes and rates create scour and deposition damage to in-stream habitat.
Activities in urbanized areas, such as vehicular traffic, deposit pollutants such as heavy
metals and oil & grease on paved surfaces where they easily wash off into the streams.
All roadway construction and improvement projects that disturb more than ½ acre must
meet the requirements of this chapter.
Best management practices (BMPs), both structural and nonstructural, can reduce the
amount of pollutants in stormwater. This section of the manual establishes minimum
standards for the design, maintenance, application, and construction of structural water
quality BMPs.
BMP TYPE
Stormwater for the proposed development will be treated by a treatment train of new onsite
measures and existing downstream measures. As required, the treatment train will show
the City of Carmel requirement of 80% Total Suspended Solids (TSS) removal will be met.
The proposed measures are noted on the BMP Location map contained herein.
STORMWATER INLETS AND MANHOLES
The proposed development includes a series of onsite stormwater inlet/manhole
structures and interconnecting pipes. The inlets are located at designed low areas to
collect surface runoff and convey it to the proposed basin.
AQUASWIRL XC-4
A new AquaSwirl XC-4 mechanical separator will be installed between the new onsite
stormwater collection and conveyance system and the existing curb inlets to which it
connects in Lakefront Court. Aqua-Swirl® Stormwater Treatment System is a custom
engineered, post-construction flow-through water quality device designed to remove
coarse sediment, debris and free floating oil by utilizing hydrodynamic separation
technology. Aqua-Swirl® technology is a modular high flow rate treatment system that has
no moving parts and operates under gravity flow conditions within a single swirl chamber..
FEMA MAP OVERVIEW
The project site is located within the FEMA Community Panel Map #18057C0209G dated
November 19, 2014. Review of the map indicates the site is located within the Flood
Designation ‘Zone X’ (unshaded). Therefore, the site is not subject to Flood Control
Ordinance requirements.
WATERSHED DESCRIPTION
The project site is located within the ‘White River-Carmel Creek‘ watershed as provided
on the IndianaMap GIS system. The 14-digit Hydrologic Unit Codes (HUC) for this
watershed Is 05120201090040.
SOILS OVERVIEW
The project site contains the soils listed in the following Table. The Hydrologic Soil Group
(HSG) for each soil is also provided. The appropriate limits of each soil type are depicted
in the Soils Map provided in Appendix C.
TABLE 1 – PROJECT SOILS
Soil Symbol Soil Name, Description HSG
YshAH Shoals silt loam-Urban B/D
YbvA Brookston silty clay loam-Urban B/D
ZONING INFORMATION
The site is within the corporate limits of the City of Carmel. The underlying Zoning
Classification is M-3. The proposed use is permitted in the M-3 Zoning District.
DEVELOPMENT STANDARDS
The project site is located within the City of Carmel, Hamilton County, Indiana. Therefore,
the proposed drainage improvements are subject to the standards of design and
construction of the City of Carmel. Runoff and detention sizing will be modeled using
HydroCAD version 10.00-24 utilizing the Type II rainfall distribution and rainfall depths
from Table 201-3 of the Camel Stormwater Technical Standards Manual (Manual).
STORMWATER QUALITY CALCULATIONS
The proposed site was included in the master drainage analysis for the downstream
drainage system including Stormwater Quality. An AquaSwirl AS-6 was installed in the
master plan storm sewer system just east of the bend in Lakefront Court. However,
Carmel Stormwater Technical Standards have changed since the master plan approval
and now, Section 701.01 of the Manual requires that all stormwater leaving a site shall be
treated by a minimum of two different BMP’s. Therefore, onsite stormwater quality will be
provided in the form of an AquaSwirl XC-4. The XC-4 was designed based on the
contributing drainage area, CNwq=98.5 as outlined in Section 701.04 of the Manual and
a 1” , 24 hour rainfall with a SCS Type II distribution. The XC-4 is placed online and
therefore must be capable of passing the peak 10-year design rate as well. The City of
Indianapolis Stormwater Unit Selection Guide provides the following parameters as
compared to the calculated parameters:
Soil Symbol Soil Name, Description HSG
UcfA Urban land-Crosby silt loam C/D
TABLE 2 – WATER QUALITY UNIT SELECTION
Based on the above, the WQ flow rate is treated in accordance with the City of Carmel
Stormwater Manual. As noted previously, an existing AquaSwirl unit downstream and
offsite further treats the runoff before discharging into the existing pond to the east of the
site and Lakefront Court. Together, the two BMPs will provide considerably greater than
the 80% TSS required. As a result, additional stormwater quality is not required.
Area,
Ac. WQ CN
Time of
Concentration,
min.
Peak WQ
Flow, 1”,
SCS Type II,
24 hr rain
Peak 10-
year design
flow to unit
TOTAL TO WQ
UNIT 0.63 99 6 0.83 cfs 2.92 cfs
Indianapolis
Selection Guide
Parameters,
AquaSwirl XC-4
1.86 cfs 3.79 cfs
OK OK
SECTION III - INLET MAINTENANCE
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
(e.g. retail establishments) and during the fall when leaves are present on the ground.
Catch basins should also be inspected for sediment depth. A maximum depth of sediment
build up shall be the lessor of ¼ of the pipe outflow diameter or 6 inches. Upon reaching
of the maximum sediment depth, the sediment shall be removed and disposed of in
accordance with all appropriate local, state and federal regulations. Water and sediment
from cleaning procedures should NOT be dumped into a sanitary sewer.
SECTION IV - CONVEYANCES MAINTENANCE
Swales should be clear of high plant growth with a maximum height of 5 inches. Swales
should also be unobstructed by buildings, fences and have a uniform slope. Pipes shall
be inspected for sediment. If sediment reaches ¼ the pipe diameter or a 6 inches,
whichever is less, the pipe shall be cleaned and the removed sediment disposed of in
accordance with all appropriate local, state and federal regulations. Water and sediment
from cleaning procedures should NOT be dumped into a sanitary sewer.
SECTION V – AQUASWIRL XC-4 MAINTENANCE
AquaShield™ recommends that periodic system inspections be performed to determine
whether the disposal of captured material is needed to ensure proper operation of the
Aqua-Swirl® treatment system. It is important to keep in mind that all BMPs require some
degree of maintenance. Maintenance cycles are ultimately dependent on site-specific
pollutant loading conditions.
Upon installation and during construction, we recommend that an Aqua-Swirl® be
inspected every three months and cleaned as needed. An Inspection and Maintenance
Manual is furnished for each project installation for an end user(s) to track and document
system operations. A typical maintenance event for the cleaning of the swirl chamber can
be accomplished with a vacuum truck. The unit should be inspected and cleaned at the
end of construction regardless of whether it has reached its capacity for sediment or oil
storage.
During the first year post-construction, the unit should again be inspected every three
months and cleaned as needed. It is also recommended that the system be inspected and
cleaned once annually regardless of whether it has reached its sediment or floatable
pollutant storage capacity. For the second and subsequent years post-construction, the
Aqua-Swirl® can be inspected and cleaned once annually if the system did not reach full
sediment or floatable pollutant capacity in the first year post-construction. If the Aqua-
Swirl® reached full sediment or floatable pollutant capacity in less than 12 months in the
first year post-construction, the system should be inspected once every six months and
cleaned as needed. AquaShield™ further recommends that external bypass (diversion)
and convergence structures should be inspected and cleaned when feasible during
inspection and maintenance events.
Essential elements of a swirl chamber inspection include observing floating materials and
measuring the accumulated sediment at the base of the swirl chamber. These two
activities can be performed at the ground surface and there is no need to enter the device.
A typical maintenance event includes the vacuuming and disposal of floatable pollutants
and sediment from the swirl chamber. Proper health and safety protocols should be
followed during all inspection and maintenance events. AquaShield™ recommends that
all materials removed during the maintenance process be handled and disposed in
accordance with all applicable federal, state and local guidelines. Depending on the
influent pollutant characteristics of the system drainage area, it may be appropriate to
perform Toxicity Characteristics Leaching Procedure (TCLP) analyses on representative
samples of the removed material to ensure that the handling and disposition of materials
complies with applicable environmental regulations.
Inspection and maintenance activities are easily performed from the surface without the
need for confined space entry or special equipment. A vacuum truck is typically used to
clean the swirl chamber.
Refer to Appendix B for further inspection and maintenance guidelines and checklists.
SECTION VI - WATER QUALITY SYSTEM MAINTENANCE
BMP MAINTENANCE
• BMP owner is responsible for the maintenance of the onsite BMP and any costs
associated with maintaining the onsite BMP. BMP owner is required to perform any
maintenance tasks outlined in this text. Refer to the inspection and maintenance
guidelines for further clarification.
• City of Carmel Engineering Department has the right to enter the property to inspect
the BMP and maintain the BMP as necessary.
• BMP owner must routinely inspect BMPs to verify all BMP components are functioning
as designed and are not in danger of failing. All BMPs need maintenance to function
as water quality and quantity enhancements.
• Sediment that collects in the BMP shall be removed when the sediment adversely
affects the ability of the BMP to perform as a water quality control device.
• The proposed AquaSwirl XC-4 shall be maintained by the owner. Table of maintenance
tasks has been provided herein as a reference guide for the owner of the basin.
This Operation and Maintenance Manual is submitted with the intent to insure the longevity
and adequate functioning of the BMPs. The onsite post construction BMP is maintained
by the Owner. Owner is responsible for any additional maintenance and/or repair activities
to maintain the function and longevity of the BMP.
See the Appendix for additional maintenance requirements for the proposed BMPs.
APPENDIX A – BMP LOCATION MAP
PART OF
LOT 2
LOT 3First Financial Bank NALAKEFRONT COURT LAKEFRONT COURTCARM
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STORM TABLE
LOT 5
Carmel Drive Professional Partners LLC
LOT 4
Carmel Practice LLC REI Real Estate Services LLCMidwest Independent Trans
System Operator Inc
///////////////////////////////////////////////////////////////GAS
METER
PIV
ex4 ex5 EXISTING DETENTIONPONDPROJECT NO.
CHECK:DRAWN:
PLAN DATE:
DESIGN:
14020 Mississinewa Drive
Carmel, Indiana 46033
P: 317.324.8695 F: 317.324.8717
www.Fritz-Eng.com
Fritz Engineering
Services, LLC
PROJECT:
PROJECT LOCATION:
SECTION, TOWNSHIP, RANGE:
LAKEFRONT
COURT 2
5/18/2022
2204001
LAKEFRONT COURT
CARMEL, INDIANA 46032
HAMILTON COUNTY
S36, T18N, R3E
SHEET NAME
SHEET NO.
00 60'120'
SCALE: 1" = 60'
N
EXH-4
STORMWATER BMP MAP
AF AF KG
STORMWATER LEAVES THE SITE
AT CONNECTION TO EX. INLET
EX.
STORMWATER
PIPE
PROPOSED ONSITE
BMP, AQUASWIRL
20'X20'
BMP
EASEMENTPR.
STORMWATER
INLET
PR. STORM
PIPE
EX. OFFSITE BMP,
AQUASWIRL
APPENDIX B – AQUASWIRL MAINTENANCE & DETAILS
Site Name:Change in ownership since last inspection?Y N
Owner Name:
Owner Address:
Owner Phone Number:
Emergency Phone Number:
Location:
Date:
Time:
Inspector Name:
Floatable Debris and Oil
1. Remove manhole lid to expose liquid surface of Aqua-SwirlTM.
2. Remove floatable debris with basket or net if any is present.
3. If a hydrocarbon spill has occurred, (e.g. more than a sheen of oil or gas is present) the system should be cleaned immediately
(see "Cleaning" Figure 3).
Note: Water in an Aqua-SwirlTM can appear black like oil due to the dark body of the surrounding structure. Oil appears
darker than water in the system and is usually accompanied by debris (e.g. Styrofoam, etc.) with obvious signs of oil stains.
The depth of oil can be measured with an oil/water interface probe, a stadia rod with water phylic paste,
a coliwasa, or by simply collecting a representative sample with a jar attached to a rod.
4. If hydrocarbon absorbant floc or pads are used, these should be inspected to determine whether they are loaded with
hydrocarbons. This will be indicated by a dark colaration of the pad or floc. Pads and/or floc should be removed and
disposed of in accordance with City of Indianapolis and any applicable state and/or federal laws if they contain hydrocarbons.
Sediment Accumulation
Lower a dipstick tube equipped with a ball valve (e.g. Sludge Judge or similar device) into Aqua-SwirlTM through the service access provided.
Measure the depth of the sludge. The sludge should not exceed 6" depth before maintenance. See Figures 1 and 2.
6"
Figure 1 Figure 2
Aqua-Swirl TM XCelerator ®
Inspection
Maintenance Items
Operation, Maintenance, and Inspection Manual for BMP Owners
(Note: Attach certifications for local regulatory authority including any applicable fees.)
City of Indianapolis, Indiana
Site and Owner Information
Diversion Structures
If an external diversion structure is present on the site, this should be inspected for the following items.
1. Inspect weir or other structure for structural decay or damage. Weirs are more susceptible to damage than off-set piping and should
be checked to confirm that they are not crumbling or decaying.
2. Inspect diversion structure and by-pass piping for signs of structural damage or blockage from debris or sediment accumulation.
3. Measure elevations on diversion weir or piping to ensure it is consistent with site plan design.
4. Inspect downstream structure in diversion system for signs of blockage or structural failure.
Remove sediments, oils and other
floatable pollutants with a vactor. Dispose of all waste in
accordance with City of Indianapolis and any applicable state,
and/or federal requirements.
Oil should be pumped and removed with any liquids and
sediments that have been trapped in the system.
These liquids should be taken to an industrial waste water
treatment facility for treatment. Liquids and solids pumped from
the AquaSwirlTM should not be dumped back into the
stormwater system or into a sanitary sewer.
Figure 3
Note: The AquaSwirlTM is designed so that entry to the system is not necessary for inspection or maintenance. If, however,
you wish to enter the system, this is an OSHA confined space entry and OSHA confined space entry procedures should be followed
to enter the system.
During Construction
Inspect the AquaSwirlTM every three months (minimum) and clean the system as needed. The AquaSwirlTM should be inspected and
cleaned at the end of construction regardless of whether it has reached its sediment or oil storage capacity.
First Year Post-Construction
Inspect the AquaSwirlTM every six months and clean the system as needed.
Second and Subsequent Years Post-Construction
If the AquaSwirlTM did not reach full sediment or floatable pollutant capacity in the First Year Post-Construction,
the system can be inspected once annually and cleaned as needed or bi-annually at a minimum.
If the AquaSwirlTM reached full sediment or floatable pollutant capacity in less than 12 months in the First Year Post-Construction,
the system should be inspected at least once every six months and cleaned as needed. If site monitoring indicates that trapped sediment
hardens over time, the AquaSwirlTM should be cleaned prior to sediment hardening regardless of whether it has reached its sediment storage capacit
Bypass Structures
Bypass structures should be inspected whenever the AquaSwirlTM is inspected and maintained as needed.
Cleaning
Inspection (continued)
Maintenance Schedule
Company Name:
Street Address:
City, State, Zip:
Contact:
Office Phone:
Mobile Phone:
Pager:
Date of cleaning:(Next inspection should be 3 months from this date for the first year).
Time of cleaning:
Date of next inspection:
Floatable debris present (Y/N)?
Oil present (Y/N)?Oil depth (inches):
Any structural damage?Y N Where?
Any evidence of structural wear?Y N Where?
Odors present?Y N Describe:
Any plugging?Y N Describe:
Activity Log
Structural Conditions and Comments
Maintenance Company Information
Additional Comments and/or Actions to Be Taken Time Frame
NOTES:
1. Attach site plan showing Aqua-SwirlTM location.
2. Attach detail drawing showing Aqua-SwirlTM dimensions and model number.
3. If a diversion structure is used, attached details showing basic design and elevations.
NOTES
Date Construction Started:
Date Construction Ended:
Activity 1 2 3 4 5 6 7 8 9 10 11 12
Inspect and Clean as Needed X X X X
Inspect Bypass Structures X X X X
(if applicable) and Maintain
As Needed
Clean System*X*
* The AquaSwirlTM should be cleaned once a year regardless of whether it has reached full pollutant storage capacity during the construction
phase of the project.
Activity 1 2 3 4 5 6 7 8 9 10 11 12
Inspect and Clean as Needed X X
Inspect Bypass Structures X X
(if applicable) and Maintain
As Needed
Clean System*X*
* The AquaSwirlTM should be cleaned at the end of the first year post construction if it is at or near its pollutant storage capcacity.
Otherwise, the system can be cleaned at a later date depending on how quickly the sediment starts to harden.
Activity 1 2 3 4 5 6 7 8 9 10 11 12
Inspect and Clean as Needed*X X
Inspect Bypass Structures*X X
(if applicable) and Maintain
As Needed
Clean System*
*If the AquaSwirlTM did not reach full sediment or floatable pollutant capacity in the First Year Post-Construction, the system can be inspected
once annually. If the AquaSwirlTM reached full sediment or floatable pollutant capacity in less than 12 months in the First Year
Post-Construction, the system should be inspected as frequently as past history warrants and cleaned as needed.
Regardless of whether the AquaSwirlTM reaches full sediment or floatable storage capacity, it should be cleaned
frequently enough to prevent captured sediments from hardening. Normally, cleaning once every two to three years should be sufficient to
prevent sediments from hardening.
*The bypass system should be inspected with each AquaSwirlTM inspection and maintained as needed.
Second and Subsequent Years Post-Construction
Month
During Construction
Month
First Year Post-Construction
Month
Aqua-Swirl TM
TABULAR MAINTENANCE SCHEDULE
APPENDIX C – INLET MAINTENANCE & DETAILS
INLET OPERATION, MAINTENANCE, AND MANAGEMENT INSPECTION
CHECKLIST
Project: Lakefront Court 2
Location: Lakefront Court & Carmel Drive, Carmel, IN
Date: Time:
Inspector: Title:
Signature:
Maintenance Item Satisfactory/
Unsatisfactory
Comments
1. Debris Cleanout (Inspect monthly)
1. Inlet grates clean of debris
Litter (branches, etc.), sediment has been
removed when accumulates to ¼ pipe
diameter or 6 inches, whoever is less.
2. Structure (Inspect monthly)
1. Inspect structure for signs of infiltration.
2. Inspect structure for signs of structural
failure including cracks.
Additional Comments and Actions to be Taken:
STORM BOX STRUCTURE
STANDARD STORM MANHOLE
APPENDIX D – CONVEYANCE MAINTENANCE & DETAILS
CONVEYANCE OPERATION, MAINTENANCE, AND MANAGEMENT INSPECTION
CHECKLIST
Project: Lakefront Court 2
Location: Lakefront Court & Carmel Drive, Carmel, IN
Date: Time:
Inspector: Title:
Signature:
Maintenance Item Satisfactory/
Unsatisfactory
Comments
1. Debris Cleanout (Inspect monthly)
1. Inspect storm sewer pipes
Litter, sediment, debris has been removed
2. Swales (Inspect monthly)
1. Plant height less than 5 inches
2. Plant composition according to approved
plan
3. Grass height not more than 5 inches
4. No evidence of erosion.
Additional Comments and Actions to be Taken:
RCP BEDDING SECTION < 5' FROM
EDGE OF PAVEMENT