Conservation Commission Meeting Agenda/Materials 109R and 131 Clark Lane Exhibit List (linked)

jv HALLORAN | reg 212023
SAG E | Planning & Development
Town of Waterford, CT i
MEMORANDUM
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To: Waterford Conservation Commission 1O9R & 131 CLARK LANE
PUBLIC HEARING 01-26-23
From: Mark Branse, Attorney for Kingstown Properties, LLC EXHIBIT #58
Date: February 20, 2023 Bim nce
Re: Clark Lane Affordable Housing Proposal — Application #22-14
Our File No. 28327.0001
The applicant, Kingstown Properties, LLC, hereby consents to the following conditions
or modification of its Application #22-14. By offering these conditions and modifications,
the applicant is not conceding that they are desirable from an inlands wetlands
protection perspective, but is willing to incorporate them into its plans if the Commission
so desires. Circles are provided so that the Commission can select which, if any, of
these it wishes to incorporate into a motion for approval.
o Per the recommendation of Carya Ecological Services, LLC, the plan shall be
modified to utilize Alternative #3 as submitted by the Applicant. The final design
details shall be subject to the approval of the Environmental Planner in
consultation with the Commission’s consulting engineer, SLR Associates.
o Per the recommendation of Carya Ecological Services, LLC, the plan shall be
modified to include woody plantings in the large detention basin. Species
selection shall be subject to the approval of the Environmental Planner.
o Per the recommendation of Carya Ecological Services, LLC, the plan shall be
modified to include Erosion Control Matting on all slopes steeper than 3:1.
o Per the recommendation of Carya Ecological Services, LLC, the plan shall be
modified to include a condition of approval that if any incipient channels
downgradient of the level spreader are detected, they shall be promptly repaired
under the supervision of the Environmental Planner.
o Per the recommendation of Carya Ecological Services, LLC, the plan shall be
modified to remove Bittersweet vines where found on the Applicant’s property.
o Per the recommendation of Carya Ecological Services, LLC, the plan shall be
modified to include a forebay in the bio-retention basin. The final design details
shall be subject to the approval of the Environmental Planner in consultation with
the Commission’s consulting engineer, SLR Associates.
o Per the recommendation of SLR Associates, the proposed walking trail around
the bio-retention basin shall be extended to connect with the adjacent Bates
Woods Park with the consent of the City of New London. The precise location of
such connection shall be determined in the field by the Environmental Planner.
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Per the recommendation of SLR Associates, the Applicant shall erect permanent
markers to indicate the location of inland wetlands on the site. The location and
type of marker shall be determined in the field by the Environmental Planner.
No later than October 1 of each calendar year, the Town of Waterford shall notify
the owner of record of this development if it intends to utilize salt or other de-icing
chemicals on Clark Lane or the Clark Lane Middle School driveways and parking
lots during the upcoming winter. If the Town indicates that it shall not use such
chemicals that season, then the Applicant shall also not use them.
Per the recommendation of the Environmental Planner, the Applicant shall
monitor water elevation within basins with standpipes during construction and
selecting basin plantings to match. Final planting scheduled should be submitted
to the Commission's agent for approval prior to basin planting.
Per the recommendation of the Environmental Planner, The Clark Lane
municipal stormwater drainage connection to the proposed private system will be
granted to the Town as determined by the Town Attorney.
Per the recommendation of the Environmental Planner, construction of the
subsurface infiltration systems and the infiltration basins should be inspected by
the design engineer during construction to verify the type, depths, and
permeability of the specified fill materials are consistent with the approved plans.
The bioretention basin soil mixture and subsoil permeability require specific
material testing, permeability testing and material components per the detail.
Verification of those properties will need to be provided to the Town.
Per the recommendation of the Environmental Planner, prior to the issuance of a
certificate of occupancy an as-built plan and inspection report will be required
with a written verification that the stormwater treatment and infiltration systems
were constructed in accordance with the approved plans and the design
infiltration rate.
Per the recommendation of the Environmental Planner, performance of the
bioretention basin in pollutant removal including nitrogen, phosphorus, metals,
and bacteria generated from the site development should be monitored at
intervals of 2 times per year (semi-annually) by a qualified third party following
completion of the site construction to demonstrate pollutant removal functions of
the biofiltration/detention basin system and monitor potential impacts to stream
quality from the site development.
Samples are to be collected where the stormwater enters the biofiltration basin
and exits the detention basin. Parameters to be tested include: total suspended
solids, total phosphorus, nitrate-N, total copper, total lead, and total zinc.
Samples are to be collected during storm events of 0.5 inch or greater during a
24-hour period during the early (April-May) and late (September-October)
growing season. A year-end monitoring report will be required to be submitted to
the Commission's agent by December 15th of the monitoring year. Stormwater
discharge quality monitoring and reporting should continue for a minimum of 3
years following completion of site development.
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o Per the recommendation of the Environmental Planner, post construction
monitoring of the stormwater basin vegetation and stabilization should be
conducted by a wetland scientist or other qualified professional for a period of
three (3) years following completion of the stormwater basins to document
vegetation establishment/success and functioning of the stormwater basins.
Monitoring should be conducted 2 times per year during the early and latter part
of the growing season and include, vegetation establishment, depth of ponding
and draw-down interval, sideslope and substrate stabilization, and outlet
stabilization. Invasive plant species shall be removed from the basins. Total
herbaceous coverage of the basin is to equal or exceed 75% at the end of the
second monitoring year. A monitoring report will be required to be submitted to
the Conservation Commission by the end of each monitoring year. The
Commission may require corrective actions to maintain or repair the stormwater
basins.
o Per the recommendation of the Environmental Planner, the proposed
conservation easement restrictive document should note that the land includes
uplands as well as wetlands.
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One Goodwin Square, 225 Asylum Street, Hartford, CT 06103 860 522-6103 Fax 860 548-0006 www.halloransage.com
Hartford / Danbury / Middletown / New Haven / New London / Westport / Washington, D.C.