Conservation Commission Regular Meeting Materials (linked)

PHONE: 860-442-0553
www.waterfordct.org
FIFTEEN ROPE FERRY ROAD
WATERFORD, CT 06385-2886
Date: August 9, 2021
To: Waterford Conservation Commission
Re: Application #C-2 1-08: 908 Hartford Turnpike
Multi-Unit Residential Development
Application Materials Review Comments
Proposed Regulated Activity:
The application is for the construction of a 40 unit multi-family residential complex on an 16.6 acre parcel
located along the southerly side of Rte. 85, Hartford Turnpike. The development envelope is
approximately 2.7 acres on the northern portion of the property and will include 1.5 acres of impervious
roof area, parking surface and driveway walkways surfaces. The site presently supports a residential
structure and outbuildings in the area of proposed development.
Regulated activities associated with this application include:
clearing, excavation and grading adjacent to inland wetlands,
discharge of stormwater run-off to inland wetlands and a perennial watercourse.
Wetland Description:
1. Perennial Tributary to Jordan Brook (JCT-2)
The property contains an approximately 1,100 ft. reach of an un-named tributary to Jordan Brook,
identified in the watershed management plan as JCT-2. This stream is perennial and the wetland is ranked
as a high quality wetland in the watershed, possessing high ecological integrity and high fish and wildlife
resource value. The management plan identifies JCT-2 as a wetland of special significance and sensitive
to water quality impacts.
Measures to protect water quality, maintain groundwater base flows and pre-development peak discharge
rates, and to treat stormwater discharges to achieve no net increase in pollutant loading compared to
existing conditions are recommended for development along this tributary. The management plan also
recommends the designation of an upland protection zone of undisturbed vegetation along the wetland
boundary to protect wetlands of special significance.
2. Jordan Brook Mainstem (JCM-1)
An approximate 500 ft. length of the central mainstem of Jordan Brook (JCM-1) flows through the
southwest portion of the property. Jordan Brook is a perennial trout stream and this reach is identified as
a very high quality wetland resource and a wetland of special significance in the Jordan Brook Watershed
Management Plan. No activity is proposed in the southern portion of the property as part of this
application. The nearest clearing activity is 600 ft. upgradient of the Jordan Brook main stream channel.
The majority of the property consists of forested upland. Refer to attached aerial photo and watershed
wetland summary information.

Stormwater Controls:
The proposed project includes an infiltration basin designed to capture the water quality volume from the
developed site. Riser pipes in the basin direct excess flow to a sub-surface ADS stormwater detention
system constructed under the eastern parking area. Discharge from the detention system is directed to the
un-named tributary. A Stormwater Management Design report has been submitted as part of the
application. A site operation and maintenance plan is included in appendix E.
The design meets the recommendation of the watershed management plan of no increase in peak
discharge over existing conditions.
Information should be provided on the anticipated effectiveness of the stormwater management system in
meeting the recommended “no net increase” in pollutant loading.
Plan Review Comments:
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8)
The application should address how the upland vegetated slopes adjacent to the wetland resource
are proposed to be protected from disturbance during and after construction. This natural
vegetated buffer is an important element of the riparian corridor and serves to protect the wetland
soils, vegetation and stream hydrology and habitat. The management plan recommends a
minimum of 50 ft. vegetated upland protection area and 100 ft. protection area adjacent to
perennial stream channels. The adjacent development at Target store maintained a 50 ft. wide
conservation easement along this watercourse.
The limits of clearing proximal to the stream channel can be located further from the resource
boundary and closer to the edge of grading in order to preserve natural vegetated buffer area
between the development and the stream corridor.
Options to increase the buffer between the stormwater outlet and the stream channel embankment
should be evaluated to increase natural vegetated buffer in this area.
The location of the infiltration basin should not be used as a temporary sediment trap or
stormwater run-off control swale during construction. Temporary measures to deter machinery,
stockpiling and compaction of the soils in this area should be identified in the construction plans.
The CTDEEP Stormwater Manual recommends pre-treatment of 25% of the water quality volume
in a forebay area or by other component to capture coarse particulates, floatables and oil & grease
prior to infiltration. The capacity of the catch basin trap proposed at the inlet to this basin should
be explained. A designated forebay may be needed at the basin inlet.
The in-situ soils within the infiltration basin should be tested for permeability. A minimum of
two (2) field permeability tests should be conducted by the design engineer prior to submittal of
final construction plans to verify the basin infiltration rates and identify if any amendments to the
basin soils are necessary to achieve performance as a stormwater infiltration component.
Stormwater run-off should not be discharged to the infiltration basin until exposed soil surfaces
are stabilized with vegetative cover to prevent clogging of the filter media.
The geotechnical borings and test probes identify seasonal high water levels in the area of the
proposed subsurface detention system. The potential impact of seasonal water table on the
performance and capacity of the system should be explained.

9) The application should include the level of stormwater treatment and anticipated pollutant
removal efficiency of the stormwater treatment system and maintenance plan.
10) A checklist for inspection and maintenance of the stormwater treatment structures and the best
management practices to control pollutant discharge should be developed for this project. The
maintenance plan should include inspection and cleaning requirements for the catch basins, the
infiltration basin and the sub-surface detention system, and the outlet area. The plan should also
address what measures are required to restore the treatment capacity of the infiltration basin
should standing water occur for a period longer than 3-5 days after a storm event.
11) The application should identify what activity(s) and surface treatment is proposed along the foot
trail leading across the tributary stream channel. This the pathway of an old cartway that has
become overgrown, but the path does not lead much further than the adjacent property of Target.
* * *
Respectfully,
2 hifthl?
Maureen FitzGerald
Environmental Planner

JCT-2 un-named tributary eae
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Scale: 1"=200 ft.
2016 Aerial Photo

Town of Waterford
WETLANDS SUMMARY
WETLAND VALUES
VERY HIGH
(Gl HIGH
Wl AVERAGE
(iy LOW
/\/ MAJOR ROADWAYS
SCALE: 1 INCH = 4000 FT
4000 0 4000 Feet
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O) FUSS & ONEILL INC. rs uitne tuys
GIS\931 S4\PROJECTS\SPECIALWET APR
Fog Plain Road
Miner Lane
\— Great Neck Road

Fuss & O'Neill Inc.
TABLE 6
INLAND WETLANDS SUMMARY
JORDAN BROOK WATERSHED MANAGEMENT PLAN
TOWN OF WATERFORD
FEBRUARY 2000
Mean Mean | Mean | Subjective | Final Water Special
Wetland Area | Conductivity | FVI WVU Opinion | Wetland | Quality | Signif
(acres) | (umhos/em) | (Score) | (Score) (Score) Value Sensitive
[Lower Jordan Brook
JLM1 37.4 80 0,66 24.67 . 3 High I Xx
JLM2 2.0 72 0.68 1.35 4 Very High P x
JLM3 17.1 60 0.66 11.25 2 High P
JLT1 18.9 94 0.50 9,51 2 Average I
JLS1 93.9 0.62 58.61 3 High Xx
JLP1 3.0 98 0.49 1.48 2 Average I
JLP2 2.1 71 0.64 1.34 3 High
JLP3 3.4 74 0.69 2.35 4 Very High P X
Central Jordan Brook
JCMI1 60.1 82 0.75 44.78 3 Very High P Xx
JCM2 31.4 83 0.57 17.99 2 Average I
JCT1 16.3 51 0,46 7.48 2 Low
JCT2 47.0 56 0,68 31.86 3 High P x
JCT3 22.7 0.48 10.97 2 Low
JCT4 7.0 0.49 3,43 2 Low
JCTS 12.4 0.55 6.85 1 Low
JCT6 40.4 154 0.62 25.24 4 High P x
JCS1 27.1 0.74 20.17 4 Very High x
JCS2 26.6 0.47 12,53 2 Low I
JCP1 6.0 0.56 3.34 yA Average if
Upper Jordan Brook
JUM1 45,5 38 0.72 32.96 4 Very High P x
JUT1 95 0.59 5.56 2 Average
JUSI 3.6 0.48 173 1 Low
JUP1 2:2 0.50 1.11 2 Average I
JUP2 2.8 56 0.59 1.65 3 High
Nevins Brook
INM1 30.3 97 0.56 16.99 2 Average I
INM2 16.3 102 0.71 11.56 3 Very High P 4
NTI 26.8 110 0.74 19.82 4 Very High P x
INT2 6.5 253 0.50 3,25 3 High I
INT3 7A 84 0.65 4.64 3 High
NS1 13.9 0.60 8.35 4 High
INS2 14.4 62 0.58 8.34 2 Average I
NP1 2.5, 33 0.67 1.67 4 Very High P Xx
NP2 3.7 102 0.57 2.09 2 Average I
P93/93154/A2/TABLE3.WB2