Conservation Commission - 102 (08/11/2022)

July 27, 2022 
 
Maureen FitzGerald 
Town of Waterford 
15 Rope Ferry Road 
Waterford, CT  06385 
 
 
Environmental Planner 
 
1. Tidal wetlands occur along Oil Mill Road and inland wetlands along Gurley Road 
adjacent to the proposed utility installations in roadways. Appropriate ESC measures 
should be included on plans and in narrative for the protection of these resource areas. 
 
Silt fence has been added to along tidal and inland wetlands along Gurley and Oil 
Mill Rd 
 
2. Extent of AE flood hazard area should be shown on the plan sheets. The sewer extension 
is partly within this flood hazard area. 
 
The flood hazard area has been added to the plans 
 
3. Dewatering is anticipated to be required for utility trench work. Where will de-watering 
discharge be treated and by what means to avoid sediment impacts to the Niantic River 
and Oil Mill Brook? 
 
A detail sheet has been added to the plan outlining a dewatering plan. The intent of 
the plan is to provide a clear water discharge for trench dewatering activities, as 
necessary for the completion of the project. The means and methods are based on 
section 5-13 of the 2002 Connecticut Guidelines for Soil Erosion and Sedimentation 
Control. Any unforeseen problems that arise during construction should be solved 
based on these guidelines as well. 
 
4. Proposal involves regulated inland wetland activity, an inland wetlands and watercourse 
permit is required. 
 
Wetlands application will be submitted 
 
 
 
 
CLA Engineers, Inc. 
Civil 
  Structural 
Survey    
317 MAIN STREET 
NORWICH, CT 06360 
(860) 886-1966 
(860) 886-9165 FAX 

  
5. The project area lies within the Niantic River drainage area. Measures to minimize 
impervious surface area and mitigate stormwater impacts to the receiving water are 
required. 
 
All extra parking spaces have been removed from the plan to minimize impervious 
cover.  
 
6. Parking spaces exceed the required number by 25. 
 
The amount of parking spaces has been reduced to the required number of spaces. 
 
7. Site plan and site operation protocols should include controls for the outdoor storage and 
use of / disposal of pollutants to ground surface or drainage system components. 
 
There will be no outdoor storage of materials on this site. See note on sheet 2 of site 
plan 
 
8. Tidal wetlands along Oil Mill Road and inland wetland along Gurley Road adjacent to 
proposed utility installations in roadways. Appropriate ESC measures should be included 
on plans and in narrative for the protection of these resource areas. 
 
Silt fence has been added to along tidal and inland wetlands along Gurley and Oil 
Mill Rd 
 
9. Construction sequence needed to address conversion of temporary sediment traps to 
permanent stormwater treatment basins and stabilization of stormwater basin soils to 
prevent erosion until adequate vegetative cover is established. Phased construction is 
recommended to allow completion of basins and stabilization of soils as buildings are 
completed. Minimum size requirements for temporary sediment traps should be 
provided. 
 
Construction sequence has been added 
 
10. There is a concern the discharge from basin #2 may short-circuit the linear storage and 
discharge from the forebay. 
 
The basin outlet has been moved to ensure a larger detention time.  
 
11. Site grading needs to provide access to the basin forebays and outlets for maintenance 
purposes. Review for each basin. 
 
Basins have been graded to allow for easy access of maintenance equipment  
 
12. Stormwater narrative should also address inspection and maintenance of rain gardens and 
subsurface infiltration units 
 
Drainage narrative has been updated to reflect this.  

  
 
13. Seeding notes, sheet 11 need to be revised to reflect proposed planting plan for project. 
 
Seeding note has been revised 
 
14. Application should describe type of stormwater basins proposed and anticipated pollutant 
removal efficiencies. Discharge from this development is directly connected to the 
Niantic River. As previously requested, a narrative addressing how this proposed design 
meets the goals of the Niantic River Watershed Protection plan should be submitted. 
 
This information has been added to both the wetlands letter and the drainage report 
 
15. Page H-11 of the hydrology report refers to “two permanent water quality basins”. Please 
review and revise where necessary 
 
The error was corrected 
 
 
 
Please feel free to call our office or email me at ebartlett@claengineers.com with any 
questions or comments.  
 
Very truly yours, 
Ellen Bartlett, PE