HomeMy WebLinkAboutOrdinances - 21-31 - 06/07/2021 - SSA 12, Authentix CITY OF MCHENRY
MCHENRY COUNTY
STATE OF ILLINOIS
Ordinance 21-31
AN ORDINANCE PROPOSING THE ESTABLISHMENT OF A BACKUP
SPECIAL SERVICE AREA#12 IN THE CITY OF MCHENRY, MCHENRY
COUNTY, ILLINOIS,AND TO LEVY TAXES FOR THE PURPOSE OF PAYING
THE COST OF PROVIDING SPECIAL SERVICES IN AND FOR SUCH AREA
IF THE PROPERTY OWNERS FAIL TO PROVIDE SAID SERVICES
Passed by the
Mayor and City Council
Of the
City of McHenry
McHenry County
State of Illinois
June 7, 2021
Published in pamphlet form by authority of the Mayor and City Council of the City
of McHenry, McHenry County, Illinois this 8t' day of June, 2021.
ORDINANCE NO 21-31
AN ORDINANCE PROPOSING THE ESTABLISHMENT OF A BACKUP SPECIAL SERVICE AREA#12
IN THE CITY OF MCHENRY, MCHENRY COUNTY, ILLINOIS,AND TO LEVY TAXES FOR THE
PURPOSE OF PAYING THE COST OF PROVIDING SPECIAL SERVICES IN AND FOR SUCH AREA IF
THE PROPERTY OWNERS FAIL TO PROVIDE SAID SERVICES.
WHEREAS, the City of McHenry, McHenry County, Illinois, is a home rule municipality as
contemplated under Article VII, Section 6, of the Constitution of the State of Illinois, and the
passage of this Ordinance constitutes an exercise of the City's home rule powers and functions
as granted in the Constitution of the State of Illinois; and
WHEREAS, the constitutional authority for home rule powers is set forth in Article VII,
Section 6, of the Constitution of the State of Illinois in force July 1, 1971, which provides in
relevant part as follows:
§6. Powers of Home Rule Units.
Except as limited by this Section, a home rule unit may exercise any power and perform
any function pertaining to its government affairs including, but not limited to, the power
to regulate for the protection of the public health, safety, morals and welfare;to license;
to tax; and to incur debt.
WHEREAS, special space areas are established pursuant to the provisions of the "Special
Service Area Tax Law", 351LCS 200/27-35, as amended, and pursuant to the Revenue Act of 1939
of the State of Illinois, as amended; and
WHEREAS, it is in the public interest that the establishment of the area hereinafter
described as a backup special service area for the purpose set forth herein be considered (the
"Areal; and
WHEREAS, the Area is compact and contiguous and is totally within the corporate limits
of the City of McHenry, McHenry County, Illinois (the "City"); and
WHEREAS, Continental 601 Fund LLC. (the "Contract Purchaser") is under contract to
purchase the property known as Lot 1 of the Final Plat of Subdivision of Authentix at McHenry,
which has been annexed to the City, which said property is located on the property legally
described in "EXHIBIT A", attached hereto and incorporated by reference; and
WHEREAS, Vantage McHenry Holdings, LLC. (the "Owner") or its successors and assigns
may develop land known as Lot 2 of the Final Plat of Subdivision of Authentix at McHenry legally
described in EXHIBIT A; and
WHEREAS, the Contract Purchaser is proposing to construct a storm water detention
basin ("Stormwater Facilities") located at the north end of said Lot 1 which shall also service said
Lot 2 for future development, as identified in the Stormwater Management Report (the
"Stormwater Report") dated March 25, 2021 by V3 Company attached hereto as "EXHIBIT B";
and
WHEREAS, maintenance of the Stormwater Facilities by the City are special services which
may lawfully be paid from additional taxes upon the Area; and
WHEREAS, the City intends that the Stormwater Facilities be maintained in good working
order, subject to availability of sufficient funds from the Taxes (as hereinafter defined); and
WHEREAS, the City intends that the Taxes (as hereinafter defined) be set aside as a
reserve fund as a backup method of financing for the purpose of reconstructing, replacing,
rehabilitating, reconfiguring, and improving the Stormwater Facilities in the event that the
Contract Purchaser and the Owner or their successors and assigns fail to maintain said
Stormwater Facilities and thirty (30) days' notice has been given to the property owner(s); and
WHEREAS, the Area will benefit specifically from the special services to be provided (the
"Services") and the Services are unique and in addition to municipal services provided to the City
as a whole, and it is,therefore, in the best interests of the City that the establishment of the Area
be considered; and
WHEREAS, it is in the public interest that taxes be levied by the City at a rate or amount
of tax sufficient to provide revenues required for the purpose of paying the cost of provided the
Services (the "Taxes"); and
WHEREAS,an annual tax shall be levied upon all taxable property with the Area from time
to time, as determined by the Mayor and City Council, in an amount to be determined of the
value as equalized or assessed by the McHenry County Assessor's Office of all taxable property
in the Area, which shall not exceed 0.25% of the equalized or assessed value of the Area, in
addition to all other taxes permitted by law. Said Taxes shall not exceed more than $10,000.00
for the initial year for which Taxes would be levied.
NOW,THEREFORE, BE IT ORDAINED BY THE MAYOR AND CITY COUNCIL OF THE CITY OF
MCHENRY, MCHENRY COUNTY, ILLINOIS,AS FOLLOWS:
SECTION 1: That the preambles of this ordinance are hereby incorporated into this text
as if set out herein in full.
SECTION 2: That a Public Hearing shall be held at 7:00 p.m. on 2021,
at the McHenry Municipal Building, 333 South Green Street, McHenry, Illinois (the "Hearing") to
consider the establishment of the Area in the territory, and for the purpose of providing the
Services, as full described in the Notice of Public Hearing set forth in Section 4 hereof (the
"Notice"), and to consider the tax levy described in the Notice.
SECTION 3: That notice of the Hearing shall be given by publication and mailing. Notice
by publication shall be given by publication at least once not less than thirty (30) days prior to
the Hearing on , 2021 in the Northwest Heard,the same being a newspaper having
a general circulation within the City. Notice by mailing shall be given by depositing the Notice in
the United States mail addressed to the person or persons in whose name the general taxes for
the last preceding year were paid on each lot, block,tract, or parcel of land lying within the Area.
The Notice shall be mailed not less than ten (10) days prior to the time set for the Hearing. In the
even taxes for the last preceding year were not paid, the Notice shall be sent to the person last
listed on the tax rolls prior to that year as the owner of said property.
SECTION 4:That the Notice shall be in substantial conformance with the following form:
Notice of Public Hearing
City of McHenry, McHenry County, Illinois
Special Service Area #12
NOTICE IS HEREBY GIVEN that at 7:00 p.m., 2021, at the McHenry
Municipal Building, 333 South Green Street, McHenry, Illinois, a hearing (the "Hearing") will be
held by the City Council of the City of McHenry, McHenry County, Illinois (the "City"),to consider
the establishment of Special Service Area #12 of the City consisting of the following described
territory (the "Area"):
PART OF THE SOUTHEAST QUARTER OF SECTION 23,TOWNSHIP 45 NORTH, RANGE 8 EAST OF THE THIRD
PRINCIPAL MERIDIAN, DESCRIBED AS FOLLOWS: COMMENCING AT THE SOUTHWEST CORNER OF SAID
SECTION;THENCE NORTH 89 DEGREES 35 MINUTES 18 SECONDS EAST ALONG THE SOUTH LINE THEREOF,
42.72 FEET(DEED= NORTH 89 DEGREES 28 MINUTES 57 SECONDS EAST,40.0 FEET),TO THE EAST RIGHT-
OF-WAY LINE OF ILLINOIS ROUTE 31 SAID LINE BEING 40.0 FEET EAST OF AND PARALLEL TO SAID
CENTERLINE;THENCE NORTH 00 DEGREES 04 MINUTES 57 SECONDS WEST ALONG SAID LINE 507.0 FEET
(DEED = NORTH 0 DEGREES 12 MINUTES 35 SECONDS WEST 507.0 FEET), TO THE SOUTHWEST CORNER
OF THE PROPERTY DESCRIBED IN DOCUMENT NO. 2000110060046; THENCE NORTH 89 DEGREES 35
MINUTES 18 SECONDS EAST (DEED = NORTH 89 DEGREES 28 MINUTES 57 SECONDS EAST), ALONG THE
SOUTH LINE THEREOF, 405.18 FEET TO THE NORTHWEST CORNER OF THE PROPERTY DESCRIBED IN
DOCUMENT NO.98R00052114 FOR THE POINTOF BEGINNING;THENCE CONTINUING NORTH 89 DEGREES
35 MINUTES 18 SECONDS EAST(DEED=NORTH 89 DEGREES 28 MINUTES 57 SECONDS EAST),ALONG SAID
LINE, 528.84 FEET TO THE SOUTHEAST CORNER OF SAID PROPERTY DESCRIBED IN DOCUMENT
NO.2000R0060046; THENCE NORTH 0 DEGREES 06 MINUTES 19 SECONDS WEST ALONG THE EAST LINE
THEREOF, 100.30 FEET(DEED=NORTH 0 DEGREES 12 MINUTES 40 SECONDS WEST 100.30 FEET);THENCE
NORTH 0 DEGREES 06 MINUTES 14 SECONDS WEST ALONG THE EAST LINE THEREOF, 302.77 FEET(DEED
= NORTH 0 DEGREES 12 MINUTES 35 SECONDS WEST, 302.77 FEET); THENCE SOUTH 89 DEGREES 53
MINUTES 39 SECONDS EAST ALONG THE SOUTH LINE THEREOF, 198.02 FEET(DEED=SOUTH 90 DEGREES
00 MINUTES 00 SECONDS EAST, 198.02 FEET);THENCE NORTH 0 DEGREES 06 MINUTES 39 SECONDS WEST
ALONG THE EAST LINE THEREOF,574.15 FEET(DEED=NORTH 0 DEGREES 13 MINUTES 00 SECONDS WEST,
574.15 FEET) TO THE SOUTHERLY RIGHT-OF-WAY LINE OF F.A. ROUTE 201 AS DESCRIBED IN CIRCUIT
COURT CASE 73-3756; THENCE SOUTH 57 DEGREES 19 MINUTES 14 SECONDS EAST ALONG SAID RIGHT-
OF-WAY LINE, 296.12 FEET; THENCE SOUTH 65 DEGREES 39 MINUTES 38 SECONDS EAST ALONG SAID
RIGHT-OF-WAY LINE, 400.78 FEET; THENCE SOUTH 62 DEGREES 05 MINUTES 03 SECONDS EAST, 132.39
FEETTO THE WEST LINE OF THE EAST 755.70 FEET OF SAID SOUTHEAST QUARTER,SAID LINE ALSO BEING
THE WEST LINE OF THE OAKS OF MCHENRY PHASE 2,BEING A SUBDIVISION OF PART OF SAID SOUTHEAST
QUARTER, ACCORDING TO THE PLAT THEREOF, RECORDED APRIL 28, 1999 AS DOCUMENT NO.
1999R0031334; THENCE SOUTH 0 DEGREES 04 MINUTES 30 SECONDS EAST ALONG SAID WEST LINE,
1090.14 FEET TO THE SOUTH LINE OF SAID SOUTHEAST QUARTER; THENCE SOUTH 89 DEGREES 35
MINUTES 18 SECONDS WESTALONG SAID SOUTH LINE, 1458.85 FEETTO THE SOUTHEASTCORNER OF LOT
2 IN COLOMER SUBDIVISION, BEING A SUBDIVISION OF PART OF SAID SOUTHEAST QUARTER ACCORDING
TO THE PLAT THEREOF, RECORDED JUNE 1, 1998 AS DOCUMENT NO. 981100033676; THENCE NORTH 0
DEGREES 06 MINUTES 45 SECONDS EAST ALONG THE EAST LINE OF SAID LOT 2 AND THE EAST LINE OF
THE PROPERTY DESCRIBED IN SAID DOCUMENT NO. 981100052114, A DISTANCE OF 507.00 FEET TO THE
PLACE OF BEGINNING, IN MCHENRY COUNTY, ILLINOIS.
An accurate map of said territory is on file in the Office of the City Clerk of said City and is
available for public inspection.
The permanent tax index numbers of each parcel located within the proposed special
service area are 09-23-400-004 and 09-23-400-031 and the property consists of Lots 1 and 2 of
the Authentix at McHenry subdivision. The proposed special service area is located east of Route
31 and east, north and south of Blake Boulevard.
The purpose of the establishment of said Special Service Area #12 is to provide a backup
method of financing special services to said Special Service Area, including all costs of operation,
upkeep, maintenance, repair, replacement, alteration, safekeeping and improvement of the
Stormwater Facilities, in the event the property owner(s) or their successors and assigns fail to
maintain said Stormwater Facilities within 30 days of a written request by the City to undertake
and complete such operation, upkeep, maintenance, repair, replacement, alteration,
safekeeping and improvement of the Stormwater Facilities (the "special services"), as the case
may be, in the City's sole discretion without the obligation to do so. Time is of the essence.
The City shall provide written notice to the owner(s) of record within the Area of any
failures or deficiencies associated with the Stormwater Facilities and such owner(s) shall have a
30-day period for undertaking such operational changes, upkeep, maintain, repair, replaces or
alter or improve the Stormwater Facilities as set forth in the City's notice. Unless emergency
circumstances exist,the City shall wait 30 days' time from the date of its notice before the City
undertakes such corrective action.
The nature of the proposed special services within the proposed special service area is for
new construction and maintenance. Funds received from the proposed special service area by
the City may be used by the City or its designated contractor to pay for the special services.
At the hearing,there will be considered a special service area tax levy from time to time,
as determined by the Mayor and City Council, and an annual tax for providing such special
services in Special Service Area #12, in an amount to not to exceed 0.25% of the assessed value
of the Area—per annum. The maximum rate of taxes to be extended within the proposed special
service area in any year would not exceed 0.25% of the assessed value of the taxable real
property within the Area and the term of the proposed special service area would be perpetual,
with no maximum term or number of years, if the proposed special service area is established.
The proposed amount of the tax levy for special services for the initial year for which taxes would
be levied would be no more than $10,000.
All interested persons affected by the establishment of said Special Service Area#12 and
the levy of said tax, including all owners of real estate located within said Special Service Area,
will be given an opportunity to be heard at said hearing regarding the proposed establishment of
said backup Special Service Area and the levy of said tax and an opportunity to file objections to
the proposed establishment of said backup Special Service Area and the levy of said tax and the
amount thereof.
At said public hearing, any interested persons affected by said proposed back up Special
Service Area may file with the City Clerk of said City written objections to and may be heard orally
in respect to any issues embodied in this notice.The Mayor and City Council of said City shall hear
and determine all protests and objections at said hearing, and said hearing may be adjourned to
another date without further notice other than a motion to be entered upon the minutes fixing
the time and place of its adjournment.
If a petition signed by at least 51%of the electors residing within said Special Service Area
#12 and by at least 51% of the owners of record of the land included within the boundaries of
said Special Service Area #12 is filed with the City Clerk of said City within 60 days following the
final adjournment of said public hearing objecting to the creation of said Special Service Area
#12, the levy or imposition of a tax for the provision of special services to said Special Service
Area#12, or to a proposed increase in the tax rate, no such backup Special Service Area #12 may
be created, or tax may be levied or imposed nor rate increased.
By order of the Mayor and City Council of the City of McHenry, McHenry County, Illinois.
Dated this day of , 2021.
/signed/
Trisha Ramel, City Clerk
City of McHenry
McHenry County, Illinois
SECTION 5: That all ordinances, orders and resolutions and parts thereof in conflict
herewith be and the same are hereby superseded, and this ordinance shall be in full force and
effect forthwith upon its adoption and approval.
Passed this 7th day of June, 2021.
Ayes Nays Absent Abstain
Alderman Devine X
Alderman Glab 1'
Alderman Harding
Alderman Strach
Alderwoman Miller
Alderman Santi ly
Alderman McCla chey k
Wayne/ett, ay Trisha Ramel, City Clerk Dt��y C4 kk
Exhibit A
Legal Description of the Subject Property
PART OF THE SOUTHEAST QUARTER OF SECTION 23, TOWNSHIP 45 NORTH, RANGE 8 EAST OF THE THIRD
PRINCIPAL MERIDIAN, DESCRIBED AS FOLLOWS:COMMENCING AT THE SOUTHWEST CORNER OF SAID SECTION;
THENCE NORTH 89 DEGREES 35 MINUTES 18 SECONDS EAST ALONG THE SOUTH LINE THEREOF, 42.72 FEET
(DEED = NORTH 89 DEGREES 28 MINUTES 57 SECONDS EAST, 40.0 FEET),TO THE EAST RIGHT-OF-WAY LINE OF
ILLINOIS ROUTE 31 SAID LINE BEING 40.0 FEET EAST OF AND PARALLEL TO SAID CENTERLINE; THENCE NORTH
00 DEGREES 04 MINUTES 57 SECONDS WEST ALONG SAID LINE 507.0 FEET (DEED = NORTH 0 DEGREES 12
MINUTES 35 SECONDS WEST 507.0 FEET), TO THE SOUTHWEST CORNER OF THE PROPERTY DESCRIBED IN
DOCUMENT NO. 2000R0060046; THENCE NORTH 89 DEGREES 35 MINUTES 18 SECONDS EAST (DEED = NORTH
89 DEGREES 28 MINUTES 57 SECONDS EAST), ALONG THE SOUTH LINE THEREOF, 405.18 FEET TO THE
NORTHWEST CORNER OF THE PROPERTY DESCRIBED IN DOCUMENT NO. 98R00052114 FOR THE POINT OF
BEGINNING; THENCE CONTINUING NORTH 89 DEGREES 35 MINUTES 18 SECONDS EAST (DEED = NORTH 89
DEGREES 28 MINUTES 57 SECONDS EAST),ALONG SAID LINE, 528.84 FEETTO THE SOUTHEAST CORNER OF SAID
PROPERTY DESCRIBED IN DOCUMENT NO.2000R0060046;THENCE NORTH 0 DEGREES 06 MINUTES 19 SECONDS
WEST ALONG THE EAST LINE THEREOF, 100.30 FEET(DEED= NORTH 0 DEGREES 12 MINUTES 40 SECONDS WEST
100.30 FEET); THENCE NORTH 0 DEGREES 06 MINUTES 14 SECONDS WEST ALONG THE EAST LINE THEREOF,
302.77 FEET (DEED = NORTH 0 DEGREES 12 MINUTES 35 SECONDS WEST, 302.77 FEET); THENCE SOUTH 89
DEGREES 53 MINUTES 39 SECONDS EAST ALONG THE SOUTH LINE THEREOF, 198.02 FEET (DEED = SOUTH 90
DEGREES 00 MINUTES 00 SECONDS EAST, 198.02 FEET); THENCE NORTH 0 DEGREES 06 MINUTES 39 SECONDS
WEST ALONG THE EAST LINE THEREOF,574.15 FEET(DEED= NORTH 0 DEGREES 13 MINUTES 00 SECONDS WEST,
574.15 FEET) TO THE SOUTHERLY RIGHT-OF-WAY LINE OF F.A. ROUTE 201 AS DESCRIBED IN CIRCUIT COURT
CASE 73-3756; THENCE SOUTH 57 DEGREES 19 MINUTES 14 SECONDS EAST ALONG SAID RIGHT-OF-WAY LINE,
296.12 FEET; THENCE SOUTH 65 DEGREES 39 MINUTES 38 SECONDS EAST ALONG SAID RIGHT-OF-WAY LINE,
400.78 FEET; THENCE SOUTH 62 DEGREES 05 MINUTES 03 SECONDS EAST, 132.39 FEET TO THE WEST LINE OF
THE EAST 755.70 FEET OF SAID SOUTHEAST QUARTER, SAID LINE ALSO BEING THE WEST LINE OF THE OAKS OF
MCHENRY PHASE 2, BEING A SUBDIVISION OF PART OF SAID SOUTHEAST QUARTER, ACCORDING TO THE PLAT
THEREOF, RECORDED APRIL 28, 1999 AS DOCUMENT NO. 1999R0031334; THENCE SOUTH 0 DEGREES 04
MINUTES 30 SECONDS EAST ALONG SAID WEST LINE, 1090.14 FEET TO THE SOUTH LINE OF SAID SOUTHEAST
QUARTER;THENCE SOUTH 89 DEGREES 35 MINUTES 18 SECONDS WEST ALONG SAID SOUTH LINE, 1458.85 FEET
TO THE SOUTHEAST CORNER OF LOT 2 IN COLOMER SUBDIVISION, BEING A SUBDIVISION OF PART OF SAID
SOUTHEAST QUARTER ACCORDING TO THE PLAT THEREOF, RECORDED JUNE 1, 1998 AS DOCUMENT NO.
98R00033676; THENCE NORTH 0 DEGREES 06 MINUTES 45 SECONDS EAST ALONG THE EAST LINE OF SAID LOT
2 AND THE EAST LINE OF THE PROPERTY DESCRIBED IN SAID DOCUMENT NO. 98R00052114, A DISTANCE OF
507.00 FEET TO THE PLACE OF BEGINNING, IN MCHENRY COUNTY, ILLINOIS.
27
Exhibit B
Stormwater Management Report dated March 25, 2021 by V3 Company
28
FINAL
STORMWATER
V
MANAGEMENT REPORT
PROJECT SITE:
MCHENRY-AUTHENTIX
EAST OF RICHMOND ROAD AND BLAKE ROAD
CITY OF MCHENRY, MCHENRY COUNTY, ILLINOIS
PREPARED FOR:
CONTINENTAL 523 FUND LLC
W134 N8675 EXECUTIVE PARKWAY
MENOMONEE FALLS, WISCONSIN 53051
PREPARED BY:
V3 COMPANIES
7325 JANES AVENUE
WOODRIDGE, ILLINOIS 60517
630.724.9200
MARCH 25,2021
V3 Companies Project No. 20776
TABLE OF CONTENTS
Section 1- Storm Water Management Narrative
Section 2- Storm Water Management Calculations
- Existing Curve Number
- Existing Time of Concentration
- Existing Win TR-20 Output(Drainage to the West)
- Proposed Runoff Coefficient
- Proposed Time of Concentration
- Proposed Curve Number
- Proposed Stage Storage Discharge
- Proposed Stage Storage Table
- Proposed Win TR-20 Output
Section 3- Storm Water Exhibits
- Existing Tributary Area Exhibit
- Proposed Tributary Area Exhibit
- Proposed Pervious Area Exhibit
- ALTA/NSPS Land Title and Topographic Survey
Section 4- General Exhibits
- Project Location Map
- Aerial Map
- USGS Topographic Map
- USGS Hydrologic Atlas
- FEMA FIRM
- Flood Zones of McHenry County, Illinois, Map
- National Wetland Inventory Map
- Soil Survey of McHenry County
Stormwater Management Report
for
McHenry - Authentix
East of Richmond Drive and Blake Road
City of McHenry, McHenry County, Illinois
OVERVIEW:
The proposed McHenry—Authentix development is located east of the intersection of Richmond Drive
and Blake Road, in the City of McHenry. The existing 20.60 +/- acre site is undeveloped farm land, with
limited foliage. The proposed site will provide stormwater detention for all onsite drainage, and also for
the future developed condition for the 7.58 +/- acres of farmland to the south. Under existing
conditions, the site generally drains from west to east, then sheet flowing across the residential
properties to the east.The property is located within the Upper Fox River watershed.
PROPOSED STORMWATER MANAGEMENT SYSTEM:
Continental Properties is proposing to develop the property with an apartment complex containing 12 2-
story apartment buildings, a clubhouse with pool, at-grade parking including garages, and associated
utility infrastructure.The project will also include a proposed detention basin located at the north end of
the site.
The existing 20.60-acre site is undeveloped farmland that drains via sheet flow from the west to the
east. The 7.58-acre parcel south of the project site not currently being developed also sheet flows from
west to east. Overall, the entirety of the property sheet drains across the residential properties on the
west side of Hazelwood Drive. An Existing Tributary Area Exhibit can be found in Section 3 of this report.
The proposed 20.60-acre project site is designed to drain into storm sewers that will convey stormwater
into the proposed detention pond to the north before being released to the northeast through a
restrictor structure. Overland overflow routes will also be provided to safely convey larger storm events
through the project site and to the detention basin. Based on discussions with the adjacent property
owner and the Village, the proposed detention basin has been designed to provide the required
detention volume for the 20.60 acre proposed development in addition to the roughly 7.58-acre
property to the south. Multiple storm sewer stubs have been provided at the south property line to
allow for the future connection of that property to the detention basin when the 7.58 acres to the south
is developed.
As reflected on the Proposed Pervious Area Exhibit in Section 3, the proposed development is 38.1%
pervious resulting in a proposed CN of 91. The detention basin was also designed based on the offsite
property to the south having a future development CN of 91. According to the McHenry County
Stormwater Management Ordinance the release rate requirements are 0.04 CFS/acre for the 2-year
storm event, and 0.15 CFS/acre for the 100-year storm event. With a total tributary area of 28.18 +/-
acres, the allowable detention basin release rate for the 2-year event is 1.13 cfs (28.18 * 0.04 = 1.13),
and the allowable release rate for the 100-year event is 4.23 cfs (28.18 * 0.15 = 4.23). The required
storage volume and release rates were analyzed with WIN-TR20 and those results can be found in
Section 2 of this report. The restrictor orifices were sized per the required release rates, resulting in a
two-stage restrictor structure to meet each release requirement. A 5.75" restrictor is provided at
elevation 786.00 for the 2-year 24-hour event, and a 7" restrictor is provided at elevation 788.00 for the
100-year 24-hour event. The resulting actual release rates are less than the allowable release rates as
summarized in the table below and the total storage capacity of the basin is 14.17 acre-ft.
Existing Allowable Actual Release Design HWL Actual HWL
Release Rate Release Rate Rate
2-Year Storm 7.03 cfs 1.13 cfs 1.08 cfs 788.00 787.78
100-Year Storm 20.75 cfs 4.23 cfs 4.02 cfs 791.00 790.92
STORM SEWER DESIGN:
Proposed storm sewer will be designed for the 10-year 24-hour rainfall event as required by the
McHenry County Stormwater Management Ordinance.
EXISTING SOIL CHARACTERISTICS:
The soils on the project are predominantly 570A Martinsville Silt Loam, and 327B Fox Silt Loam with a
small area of 198A Elburn Silt Loam at the Northwest corner of the property per the Soil Survey of Cook
County.
EROSION CONTROL MEASURES:
A stabilized construction entrance will be installed at the west entrance location on Blake Road. Silt
fence will be installed along the perimeter of the proposed grading operations on the site and sediment
traps will be placed in all the existing and proposed storm manholes in and around the site that are
tributary to construction activities. The erosion control measures are reflected on the Erosion Control
Plans within the Engineering Plans. In addition, a Stormwater Pollution Prevention Plan (SWPPP)will be
prepared as required by the IEPA for NPDES SWPPP permitting.
CONCLUSION:
It is our opinion that the proposed stormwater management design conforms to the requirements of
McHenry County Stormwater Management Ordinance. The proposed improvements do not impact the
downstream storm water system or increase stormwater release from the project site.
V3 Companies•2
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PROJECT NO.: CLIENT. TITLE:
7325 Janes Avenue 20776 Continental 523 Fund LLC SOIL SURVEY OF MCHENRY COUNTY
GV
CREATED BY: enom N86nee F Executive Parkway
Woodridge, IL60517 Menomonee Falls,Wisconsin53051 ILLINOIS
630.724.9200 phone MSG
www.v3co.com DATE BASE LAYER: SITE EXHIBIT
03/25/2021 Authentix - Mchenry
Visio,Vertere,Virtute... SCALE: AERIAL IMAGERY(2019) McHenry Illinois
"The Vision To Transform with Excellence" See Scale Bat
N:\2020\20776\DrawingsWrcGIS\LD\Rasters\EX8_SOIL SURVEY_20776.mxd