HomeMy WebLinkAboutENG 15-16 City 00 _-_
Report to
e I.M Executive Committee
Report Number: ENG 15-16
Date: June 20, 2016
From: Richard Holborn
Director, Engineering & Public Works
Subject: Professional Monitoring Services for Stormwater Management Facilities
Duffin Heights Neighbourhood
File: A-1440
Recommendation:
1. That Council approve the hiring of the Toronto and Region Conservation Authority
for the Professional Monitoring Services for Stormwater Management Facilities
Duffin Heights Neighbourhood in accordance with Purchasing Policy 10.03 (c), as
the assignment is above $50,000.00;
•
2. That the fee proposal submitted by the Toronto Region Conservation Authority for
the Professional Monitoring Services for Stormwater Management Facilities Duffin
Heights Neighbourhood in the amount of $75,346.14 (HST included) be accepted;
3. That the total gross project cost of$85,896.00 (HST included), including the fee
amount and other associated costs, and the total net project cost of $77,352.00
(net of HST rebate) for the Professional Monitoring Services for Stormwater
Management Facilities Duffin Heights Neighbourhood be approved;
4. That Council authorize the Division Head, Finance & Treasurer to finance the total
net project cost of$77,352.00 from the Developers Contribution; and
5. That the appropriate officials of the City of Pickering be authorized to take the
necessary actions as indicated in this report.
Executive Summary: The subdivision agreements for the Cougs (Tillings) Limited
and the Lebovic Enterprises Limited developments located within the Duffin Heights
Neighbourhood outline the Monitoring Program requirements for the stormwater
management facilities for each subdivision prior to the assumption by the City of
'Pickering. The purpose of the Monitoring Program is to confirm to the satisfaction of the
City of Pickering that the stormwater management facilities have been constructed and
are functioning to the specifications in the engineering design and the Ontario Ministry
of Environment (MOE) Certificate of Approval. Both developers have contributed
towards the cost of this requirement.
ENG 15-16 June 20, 2016
Subject: Professional Monitoring Services for Stormwater
Management Facilities Duffin Heights Neighbourhood Page 2
Engineering & Public Works staff requested a fee proposal from the Toronto Region
Conservation Authority (TRCA) for this assignment due to their knowledge, experience
and expertise in monitoring services.
In accordance with Purchasing Policy 10.03 (c) where the professional service
assignment is expected to be above $50,000.00 and the initiating Director intends to
acquire the services without going through a competitive process, a Report to Council
approval is required to obtain approval to engage a firm for a professional services
assignment.
Staff are recommending Council approval of the fee proposal submitted by the TRCA for
the Professional Monitoring Services for Stormwater Management Facilities Duffin
Heights Neighbourhood in the amount $75,346.14 (HST included) .
Financial Implications:
1. Quoted Amount
TRCA Fee Proposal $ 66,678.00
HST (13%) 8,668.14
Total Gross Quoted Amount $75,346.14
2. Estimated Project Cost Summary
TRCA Fee Proposal $66,678.00
Associated Cost
Contingency 9,336.00
Sub Total — Costs $76,014.00
HST (13%) 9,882.00
Total Gross Project Cost $85,896.00
HST Rebate (11.24%) (8,544.00)
Total Net Project Costs $77,352.00
CORP0227-07/01 revised
ENG 15-16 June 20, 2016
Subject: Professional Monitoring Services for Stormwater
Management Facilities Duffin Heights Neighbourhood Page 3
3. Source of Funds 2613.2392.0000
Source of Funds Budget Required
4455.0042.
Developers Contribution -
Lebovic Enterprises Limited Cougs (Tillings) 78 000.00 77 352.00
Limited
Total: $78,000.00 $77,352.00
In 2016, the Stormwater Management Facility Monitoring Program was budgeted for in
the Water Resources & Development Services Consulting and Professional account,
subject to funding by Developers.
In 2012, the City received approximately $78,000.00 from both Cougs (Tillings) Limited
and Lebovic Enterprises Limited for the completion of the Stormwater Management
Monitoring Program as part of the subdivision agreement. These funds will be directed
to pay for the full cost of the professional monitoring fees.
Discussion: The Duffin Heights Neighbourhood is a development in
the City of Pickering. The lands are located between Taunton Road and Rossland
Road, and are bounded by West Duffins Creek to the west, the Canadian Pacific
Railway to the north and boundary between the Town of Ajax and City of Pickering to
the east, and a Hydro corridor to the south.
The Cougs (Tillings) Limited and Lebovic Enterprises Limited subdivisions are located
along the west boundary of Duffin Heights Neighbourhood area, west of Tillings Road
(see location Map). Construction of these subdivisions began in 2012 and 2013
respectively. The subdivisions are now mostly completed as of 2016.The Stormwater
Management Facility was constructed to service an area of 27 ha, which includes the
Cougs(Tillings) Limited and Lebovic Enterprises Limited subdivisions and the lands
owned by the City of Pickering. The facility was designed to provide quality, quantity
and erosion control of stormwater runoff from these lands. Three infiltration systems
were built within the subdivisions to address the groundwater balance criteria through
infiltration.
The City of Pickering requires completion of the Stormwater Management Monitoring
Program for all stormwater management facilities prior subdivision assumption. The
purpose of the Monitoring Program is to confirm to the satisfaction of the City of
Pickering that the stormwater management facility and three infiltration systems have
been constructed and are functioning to the specifications in the engineering's design
and the MOE Certificate of Approval. Performance monitoring of the facility and
infiltration systems shall commence after 50% of the dwellings/lots have been
constructed, graded and sodded within the facilities' catchment area.
CORP0227-07/01 revised
ENG 15-16 June 20, 2016
Subject: Professional Monitoring Services for Stormwater
Management Facilities Duffin Heights Neighbourhood Page 4
The Stormwater Management Monitoring Program includes measures of water levels,
detention time and release rates to confirm stormwater quantity performance. The
program also includes collection of water samples at the inlet and outlet of the facility to
characterize the removal efficiency for Total Suspended Solids. The monitoring data will
be collected over 3 year period and will be reported in annual and final reports.
The Toronto Region Conservation Authority is recommended to complete the
Monitoring Program for the Stormwater Management Facilities
In accordance with Purchasing Policy 10.03 (c) where the professional service
assignment is expected to be above $50,000.00 and the initiating Director intends to
acquire the services without going through a competitive process a Report to Council
shall be submitted to obtain approval to engage a firm for a professional services
assignment.
The TRCA and its Environmental Monitoring and Data Management Section is
comprised of a multi-disciplinary team with more than two decades of experience in the
collection and analysis of aquatic and terrestrial natural heritage data using protocols
that.have become standardized in the province of Ontario. Within this team there are
individuals who are specialized in the collection and analysis of data related to surface
water quality and quantity, fluvial geomorphology, groundwater quality and quantity as
well as terrestrial and aquatic communities and their associated habitats.
The TRCA team is ideally suited for this assignment due to their knowledge, experience
and expertise in monitoring services. It will be more cost-effective to hire TRCA to
complete the Monitoring Program.
Staff are recommending Council approval of the fee proposal submitted by the TRCA
for Professional Monitoring Services for Stormwater Management Facilities Duffin
Heights Neighbourhood in the amount $75,346.14 (HST included). It also recommended
that the net project cost of$77,352.00 (net of HST rebate) be approved.
Attachments:
1. Location Map
2. The Toronto Region Conservation Authority Fee Proposal Letter
CORP0227-07/01 revised
ENG 15-16 June 20, 2016
Subject: Professional Monitoring Services for Stormwater
Management Facilities Duffin Heights Neighbourhood Page 5
Prepared By: Approved/Endorsed By:
Ii6V(00,4,Ve
Irina Marouchko, P.Eng. Richard Holborn, P.Eng.
Water Resources Engineer Director, Engineering & Public Works
Marilee Gadzovski, M.Sc. (Eng.), P.Eng. Stan Karwowski, MBA, CPA, CMA
Division Head, Water Resources & Division Head, Finance & Treasurer
Development Services
•
Caryn Kong, CPA, CGA
Senior Financial Analyst
Capital and Debt Management
IM:mjh
Recommended for the consideration
of Pickering City Council
6P/baoeld de/4.k 3, 20/6
Tony Prevedel, P.Eng.
Chief Administrative Officer
CORP0227-07/01 revised
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Location Map
- 3- TO REPORT#_.. h15�-4°.
pTTpC1iVENT#�---
0,11111"'"I " Toronto and Region
Conservation
May 10, 2016 for The Living City=
Ms. Irina Marouchko
Water Resources Engineer
• Engineering and Public Works Department
City of Pickering
One The Esplanade •
„ Pickering, ON L1V 6K7
CFN: XXXXX
Dear Ms. Marouchko:
Re: Confirmation of Scope of Work and Funding Agreement for Duffin •
• Heights Stormwater Facility Assumption Monitoring
I am pleased to present this proposal on behalf of the Toronto and Region
Conservation Authority, to assist the City of Pickering in the implementation of
the pre-assumption monitoring activities for the Lebovic West Lands
Stormwater Management facilities in the Duffin Heights Development.
Staff in our Environmental Monitoring and Data Management Section is able to
offer a wealth of technical expertise and experience in the application of the.
monitoring approaches required for this project. I feel that our combination of
technical expertise and dedication, along with our ability to offer you a great
deal of"consistency"throughout this long-term process would be
advantageous to the City. Further we have the ability to compile and manage
the datasets required for this project in order to objectively analyze and
interpret the information found.
The drawing attached as Schedule "A", defines the proposed physical limits of
the project.
BACKGROUND
The City of Pickering requires the completion of"pre-assumption" monitoring to
be carried out at the stormwater management facilities associated with the
Lebovic West lands on the west side of Tillings Road, Pickering. Facilities
include a completed stormwater management pond and 3 infiltration trenches
that have been installed as Low Impact Development(LID) measures within
this phase of the Duffin Heights Development project.
Tel. 416.661.6600,1.888.872.2344 I Fax.416.661.6898 I info @trca.on.ca I 5 Shoreham Drive,Downsview,ON M3N 1S4
•
Member of Conservation Ontario www.trca.on.ca
ATTACHMENT# l" TO REPORT#, CIVt7 15 10
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Monitoring of quality and quantity performance indicators will be measured using a
•
combination of automated sampling instruments and manual inspections/measurement-
throughout a three (3) year period, starting in July 2016.
OBJECTIVE
The purpose of the monitoring program is to confirm to the satisfaction of the City of
Pickering that the stormwater management facilities (SWM Pond and Infiltration
Trenches) have been constructed and are functioning to the specifications in the
engineer's design and the Ontario Ministry of the Environment and Climate Change
(OMOEC) Certificate of Approval.
PROJECT SCOPE
This project is limited to the SWM pond located west of Tillings Road on the Lebovic
West development lands (See attached Figure) and the infiltration trenches located
adjacent to Dusty Drive and Teak Mews in the same development.
The outcome of the project will be the provision of a report and accompanying data
analysis to assist the City of Pickering in decisions related to the assumption of the SWM
facilities associated with this development area, and/or identify deficiencies to be
addressed by the facility Owner prior to assumption by the City.
Methods and monitoring activities are based on the quality and quantity performance
monitoring requirements identified in Schedule E of the Subdivision Agreements for both.
the Lebovic Tillings and Cougs developments (attached).
Included in Scope
• Monthly inspection of the SWM pond in dry weather conditions and the provision of
monthly photo records and inspection report
• Collection and analysis of Total Suspended Solids (TSS) samples from inlet and outlet of
pond through eight(8) significant rainfall events (>25mm over 4 hours)
• Measurement of flows through the SWM Pond using automated flow loggers to assess
pond retention (water levels) and draw down (retention rates)
• • Installation of a tipping bucket rain gauge to collect rainfall data
• Measurement and calculation of sediment volume in main pond cell
• Measurement of volume and flow in each of 3 Infiltration trenches to document infiltration
and overflow volumes
• Annual summary/progress report
• Final report with data analysis-and recommendations related to the performance/function
of SWM facilities (pond and infiltration trenches)
• Installation of a metric staff gauge at the storm pond (inlet headwall) to facilitate manual
water level measurements during monthly inspections
• Decommissioning of equipment and return to City of Pickering
Excluded from Scope
• Installation of piezometers along length of Infiltration Trenches
• Liaison with SWM facility Owners regarding maintenance requirements or deficiencies
identified
Tel. 416.661.6600,1.888.872.2344 I Fax.416.661.6898 I info @trca.on.ca I 5 Shoreham Drive,Downsview,ON M3N 1S4
Member of Conservation Ontario www.trca.on.ca
ATTACHMENT# ' TR REPORT# EM 7 1 s-/(0
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• Any additional monitoring identified by the City of Pickering throughout the monitoring
period
• Baseline topographic survey of the facility (this is to be provided by the Owner)
• Removal of any sediment from the facility or assessment of sediment quality
• Confirmation of the (development) area connected to the Infiltration Trenches for the
year(s) monitored
BENEFITS
In addition to fulfilling the needs of the City of Pickering through the completion of this
work, the key benefits of TRCA undertaking these activities are as follows:
• Consistency in project delivery and data over course of a multi-year project-True"one-window"
approach.
• Data storage and management(including QA/QC).—existing databases for water quality,fish
community and hydrology. Data will be subject to same QA/QC process as data collected through
TRCA's Regional Watershed Monitoring Program including a semi-annual inter-lab water quality
comparison
• Ability to offer efficiencies and maximize"economy of scale"related to the collection of monitoring data
at the SWM site in conjunction with other TRCA monitoring activities within the Duffin Heights and
Seaton development areas.
• Shared interest in furthering"state-of-knowledge"on Stormwater Management issues and the
performance of designed management facilities.
• Shared desire for return on data—some data collected can add to additional datasets examining the
performance and benefit of Low Impact Development(LID) stormwater management techniques,e.g.
Infiltration trenches
• Reduced administration costs to the City of Pickering associated with competitive procurement
• process and managing external contractors
• Shared corporate objectives related to watershed protection and enhancement specifically within the
Duffins Creek watershed
ASSUMPTIONS
• Monitoring equipment for use in the project to be provided by the City of Pickering, (see
attached list of equipment available)
• Monitoring will continue until the later of: 3 years or 8 significant rainfalls (defined as
25mm of rain fallen within 4 hours)
• Some equipment including rain gauge and barologger to be installed at Pickering Works
Yard adjacent to the pond
RISKS
Schedule Risks
• Lost or vandalized Equipment may delay schedule
•
Tel. 416.661.6600,1.888.872.2344 I Fax.416.661.6898 I info @trca.on.ca I 5 Shoreham Drive,Downsview,ON M3N 154
Member of Conservation Ontario www.trca.on.ca
ATTACHMENT a TO REPORT# �'1 j s l(a
of
Cost Risks •
• None anticipated,
COST •
Total costs associated with the project have been estimated below. It is proposed that
payment for the activities described herein would be based on the provision of quarterly
invoices for services completed by TRCA.A purchase order will be requested from the
City of Pickering to cover the total cost of services to be provided.
Project Management
Staff Costs $7,870.00
Vehicle/Equipment/Materials $352.00
Equipment Prep and Installation
Staff Costs $2,464.00
Vehicle/Equipment/Materials $528.00
• Baseline Sediment Survey(1)
Staff Costs $180.00
Service Package $1,500.00
Vehicle/Equipment/Materials $1,296.00
Monthly Dry Samples(36)
Staff Costs $10,116.00
Vehicle/Equipment/Materials $6,732.00
Collection and Analysis of Wet Samples(8)
Staff Costs $7,776.00
Vehicle/Equipment/Materials $2,552.00
Infiltration Trench (3)
Staff Costs $3,710.00
Vehicle/Equipment/Materials $3,388.00
Data Analysis
Staff Costs $4,390.00
Reporting
Staff Costs $5,938.00
Vehicle/Equipment/Materials $176.00
Decommission Site and Equipment
Staff Costs $1,296.00
Vehicle/Equipment/Materials $352.00
Subtotal $60,616.00 •
Project Admin Surcharge(10%) $6,062.00
Grand Total $66,678.00 Plus HST
Tel. 416.661.6600,1.888.872.2344 I Fax.416.661.6898 I info @trca.on.ca I 5 Shoreham Drive,Downsview,ON M3N 1S4
Member of Conservation Ontario Www.trca.on.ca
•
ATTACHMENT# a' TO REPORT# L r r) 1
,S of
SCHEDULE
The proposed timeline for the project is as follows:
Start-up site meeting&Pick-up of Equipment June 30,2016
Installation of Monitoring Equipment July 4-15,2016
Initiate monthly Pond Inspections July 4,2016
Sediment Volume Survey Date TBD
Collect Water Quality Samples July 2016—June 2019
Collect Water Quantity Data • July 2016—June 2019
Decommission Equipment and Return August 2019
Final Data Analysis and Report August 2019
*Note this schedule will be dependent on weather, which may dictate a shorter or longer monitoring period.
E.g. monitoring to continue for the later of 3 years or the collection of data through 8 significant rainfall
events.
•
• Please review our proposal and feel free to contact me if you have any
additional questions or comments. I thank you for the opportunity to submit this
proposal and look forward to the opportunity to work with you on this project.
Yours truly,
Per:
Name: Scott Jarvie
Title: Associate Director, Environmental Monitoring and Data
Management
For good and valuable consideration, the receipt and sufficiency of which is
hereby acknowledged, the undersigned I hereby acknowledge, accept and
agree to the foregoing scope of work and funding agreement this day of
, Year.
•
Per:
Name:
Title:
Tel. 416.661.6600,1.888.872.2344 I Fax.416.661.6898 I info@trca.on.ca I 5 Shoreham Drive,Downsview,ON M3N 154
Member of conservation Ontario www.teca.on.ca
ATTACHMENT# - TOREPORT#,
Schedule E
Quality Performance Monitoring and
Quantity Performance Monitoring of
' Stormwater Management Facilities
1. General
(1) The purpose of the monitoring program is to confirm to the satisfaction of the City of
Pickering that the stormwater management SWM Pond and Infiltration Trench have
been constructed and are functioning to the specifications in the engineer's design and
the MOE Certificate of Approval.
(2) Performance monitoring of the SWM Pond and Infiltration Trench shall commence after
50%of the dwellings/lots have been constructed,graded and sodded within the facility's
catchment area. The facilities shall be monitored until the later of:
(a) 3 years or,
(b) the occurrence of 8 significant rainfall events(defined below).
(3) A"significant rainfall event"is defined as an event where greater than 25 mm of rain • .
has fallen in 4 hours.
(4) The Owner shall make a lump sum contribution to the City on account of the City
undertaking the monitoring programs for the SWM Pond and Infiltration Trench. Such
lump sum contribution by the Owner shall be$27,618.00 and shall be paid by the
Owner prior to the registration of this plan of subdivision. Once the Owner has
provided payment to the City,the City will,within 30 days of its receipt of such payment,
process a$100,000.00 reduction to the Owner's Performance Letter of Credit(being the
amount of the Letter of Credit previously posted on account of the said monitoring
program).
(5) The City agrees to provide the Owner with a list of deficiencies,if any,and related data
for the SWM Pond and Infiltration Trench following each year of monitoring.
(6) The final acceptance process for the SWM Pond and Infiltration Trench is detailed in
Section 18 of this Agreement.
(7) Other than as expressly provided In this Schedule E,any works deemed necessary by
the City to any of the SWM Pond and Infiltration Trench as a result of the monitoring
program are the responsibility of the City,financially and otherwise,and shall not be
used as a means to extend the maintenance period or delay the City's issuance of the
Final Acceptance Certificate.
(8) If the Owner is required to perform any remedial works in accordance with this Schedule
E,then the monitoring program described herein shall be extended,if necessary,until •
such time as the remedial works have been completed to the satisfaction of the City and
have functioned to the specifications in the engineer's design and the MOE Certificate
of Approval through three(3)additional significant rainfall events.
(9) Pending the outcome of the final design of the SWM Pond and adjacent western slope,
an additional monitoring requirement may be deemed necessary.
2. SWM Pond -
The intent of the monitoring program for the SWM Pond is to confirm to the satisfaction of the
City of Pickering that the pond has been constructed and is functioning to the specifications in
the engineer's design and the MOE Certificate of Approval with respect to the total suspended
solids(TSS)removal efficiency and hydraulic function with respect to detention time and
release rates.
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ATTACHMENT#, TOREPORT#, L'4 is- I CP
2- of= •
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Sediment Removal
(1) After grading of the facility is completed and,the SWM Pond liner has been installed,the
Owner shall complete a topographic survey of the facility to determine the elevations
prior to the facility being operational. The City requires that the survey work be
completed in a dry condition. The Owner shall submit a plan to the City comparing the
results of the topographic survey to the approved SWM Pond design. The results shall
verify that the facility has been constructed in accordance with the approved design;
otherwise the process may have to be repeated.
•
(2) The City shall monitor the forebay and main cell sediment levels until issuance of a
Final Acceptance Certificate by the City. The Owner shall remove the sediments from
the forebay on an annual basis,unless it has been demonstrated that the accumulated
sediment volume is less than 25%of the forebay permanent pool volume. The City
shall estimate the volume of forebay sediments using at least five uniformly distributed •
measurements of sediment depth taken within the forebay. The Owner shall remove
the sediments from the main cell when the accumulated sediment volume is greater
than 25%of the main cell permanent pool volume. The City shall estimate the volume
of main cell sediments using at least five measurements of sediment depth along a mid
section along the length of the facility. A secchi disk shall be used to estimate levels in
a wet condition if the water level Is too deep for a sediment rod to reach.
(3) Prior to issuance of a Final Acceptance Certificate by the City,the Owner shall
determine the sediment quality by taking samples of the sediment from both the forebay
and main cell and submit them to an accredited lab;the results of these lab tests will
indicate the disposal method and shall be submitted to the City. The Owner shall drain
the facility and remove all sediments from the forebay and main cell in accordance with
the Environmental Protection Act and MOE guidelines as determined by the test results.
The Owner shall complete a second topographic survey after all the sediment has been
removed..Thls topographic survey shall be submitted to the City,along with a
comparative analysis to the survey taken after substantial completion and the approved
SWM Pond design. The results shall verify that all sediments have been removed from
the facility;otherwise the process may have to be repeated.
Water Quality Performance Monitoring
(4) The City shall install water quality samplers at the inlet and outlet of the SWM Pond to
characterize the facility's removal efficiency for TSS. Throughout the monitoring period,
the City shall collect water samples from the samplers at the inlet and outlet of the
facility after significant rainfall events and submit the samples to an accredited
laboratory to test for TSS.
(5) Water samples shall be taken for the period from substantial completion to the date on
which a Final Acceptance Certificate Is issued by the City. If it is found that the TSS
• removal efficiency is not meeting the SWM Pond's design objectives as per the MOE
•
Certificate of Approval then the City may require the Owner to undertake remedial
works to the SWM Pond to ensure the facility is operating as designed,to the
satisfaction of the City.
•
Water Quantity Performance Monitoring
(6) The City shall install a metric staff gauge adjacent to the storm sewer inlet headwall so
that the zero reading is set at the permanent pool elevation. The City shall inspect the
outlet structures on a monthly basis to ensure that perforated riser inlets are not
blocked due to sediments or debris. The monthly inspection shall be undertaken In dry
weather conditions,at least 120 hours after any rainfall event,as that is the expected
drawdown time for the extended detention storage for this SWM Pond. The monthly
reports shall include a time-stamped picture of the staff gauge and a reading to
determine any fluctuations in the permanent pool elevation.
(7) The City shall install flow measurement equipment at all inlets and outlets in addition to
a water level sensor for the SWM Pond. Measurements from the monitoring equipment
shall be made at 5 minute intervals. The water level sensor shall be referenced to a
geodetic benchmark.
33
ATTiACHMEN)# v2' T�PORI#_
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(8) The City shall install a tipping-bucket rain gauge in a suitable location in the SWM Pond
block(refer to guidance from meteorological organizations)which records rainfall data
at 5 minute intervals.The rain gauge will need to be calibrated every spring during the
monitoring period.
(9) The City shall review the data from the rain gauge in conjunction with rainfall data from
TRCA Rain Gauge 130(if any issues use rainfall data from TRCA Rain Gauge 84 or
106)for 8 significant events.The resulting data shall be analyzed to assess the
following in comparison to the approved engineering design and the MOE Certificate of
Approval:permanent pool or normal water level;fluctuation In water levels in response
to rainfall events;and facility drain down time for a range of rainfall event sizes.
(10) If it is found that the SWM Pond is not meeting the design objectives stated above in 2
(9)as per the MOE Certificate of Approval then the Owner-shall undertake remedial
works,to the satisfaction of the City. •
3. Infiltration Trench—Quantity Performance Monitoring
(1) The City shall confirm with the Owner the area connected to the Infiltration Trench for
the year in question,as it will change from year-to-year as the subdivision builds out
and it may affect the quantity of runoff entering the system.
(2) The intent of the monitoring program is to determine the performance of the Infiltration
Trench through completing a mass balance on the flow from the clean water collector
into MH 4C and the overflow into MH 57. The difference between these two •
measurements represents the volume of water that has infiltrated.Furthermore,the
water level In the trench is being monitored to ensure that it drains within 72 hours and •
that the entire length of trench is being used for infiltration.
(3) The City shall Install flow measurement equipment at MH 4C to measure the inflow
from the clean water collector,in addition to a pressure transducer to measure the
water level within MH 4C to measure the overflow into the storm sewer system.The •
water level from within MH 4C can be used to determine the flow by creating a rating
curve for the overflow Into the storm sewer. A series of piezometers may be installed
along the length of the infiltration trench to monitor the water level and the infiltration
rate and drawn down time of the facility.The elevation of the pressure transducer and
piezometers shall be referenced to a geodetic benchmark.The monitoring equipment
shall be installed immediately after completion of lot grading.
(4) The data shall be reviewed in conjunction with rainfall data from the rain gauge. The -
rainfall and water level data for 8 significant events shall be processed In a graphical
format to display the fluctuation in water levels over time.
(5) The resulting data shall be analyzed by the City to assess the following in comparison
to the approved engineering design:fluctuation in water levels In response to rainfall
events throughout the entire trench length(to ensure the entire trench is being used
• prior to overflow);facility drain down time after rainfall events to ensure the facility has
drained within the maximum length of time(72 hours);and number of overflows.
• (6) If the time to fully drain exceeds 72 hours,the Owner will be required to drain via
pumping and clean out the perforated underdrain. If slow drainage persists,then the
Owner shall undertake remedial works(consisting of removal and replacement of
granular material and/or geotextile fabric),to the satisfaction of the City.
•
•
34
ATTACHMENT# �' TOREPORT#, iVC-j
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Item
Snap Link
Pipe strap, Tapcon
Tapcon
Strap
Tapcon ConDrive 500 Tool
Cobalt Jobber Drillbit
Concrete Drillbit
9"cutter, GaIv strap, 3"pipe
Milwaukee M18 Hammer Drill Kit
Tapcons
White nylon cord
USB Communication Cable
Battery Charger.
Graduated Cylinder
Scissor Ring 50-54
Scissor Ring 16 to 36
2 ISCO 6712C
2 ISCO 750 Flow Module
2 Prohanger
2 Suspension Harness
3 ISCO 2150
Flowlink 5.1 Software
2 AV Sensor Carrier
USB Cable 2100
2 DTS-12 Turbidity Sensors
• Cable
End Cap Fixed Connection
ISCO to DTS Connector
Sonde Holder
4 Levelogger Edge
1 Barologger Edge
Software
4 Wellcaps
Optical Reader
TB3 Rain Gauge
TB 344 Mounting Bracket
TB 333 Bird Guard
FCD Field Calibration Device
ML-1-FL Logger
Wincomlog Software
Interogation Cable
Deep Cycle Batteries
Chestwaders
Batteries, Drill bit, cable ties etc.
Batteries
4"perforated pipe
3"perforated pipe and hacksaw
Battery
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