Engineering comments
North Country Office
100 Glen Street, Glens Falls, NY 12801
P: (518) 812-0513 F: (518) 824-8391
www.chazencompanies.com
Hudson Valley Office (845) 454-3980
Engineers
Environmental Professionals Capital District Office (518) 273-0055
Land Surveyors
Landscape Architects
Planners
April 3, 2012
Mr. Craig Brown
Zoning Administrator and Code Compliance Officer
Town of Queensbury
742 Bay Road
Queensbury New York 12804
Delivered via email only: CraigB@queensbury.net
Re: Ben Aronson Site Plan Review
Town of Queensbury, Warren County, New York
Chazen Project # 91204.08
Queensbury Ref No: Site Plan 21-2012
Dear Mr. Brown:
The Chazen Companies (Chazen) received a submission package from
for the above referenced project. Submitted information includes the following:
Plans entitled, Double A Provisions Parking Relocation, prepared by Jarrett Engineers, PLLC;
A Stormwater Pollution Prevention Plan, prepared by Jarrett Engi
A site plan application with supporting documentation.
Your office has requested that we limit our review to the design
and sediment control items as it relates to compliance to local,
Based on our review of the information provided, Chazen offers the foll
consideration:
Stormwater Management & Erosion and Sediment Control:
1.The proposed site improvements disturb less than 1 acre of land
NYSDEC Phase II Stormwater Regulations. However, Section 179-6-080 of the Town Code states
that stormwater drainage plans shall analyze the impacts of a pr-year
return interval storm for commercial projects. The Applicant hassubmitted the required
calculations.
2.According to Section 6.3.1 Design Guidance of the NYS SMDM, the drainage area to dry wells
should include roof runoff only. As such, the Applicant shall consider alternate means of collection
and treatment for the proposed parking areas. Further, it is noted that Drywell A may meet the
Town of Queensbury
Site Plan 21-2012 Ben Aronson
April 3, 2012
Page 2
classification of a Class V injection well as defined by the US EPA, and therefore may be subject
to the requirements of 40 CFR 144. As such, it is recommended that the applicant revisit the
design of Drywell A .
3.According to Section 5.3.7 Feasibility/Limitations of the NYS SMDM, rain gardens cannot be
to treat parking lot or roadway runoff, unless the practice is modified to include the ele
bioretention facility. As such, the Applicant shall either modify the practice or consider alternate
means of collection and treatment for the proposed parking areas
4.The plans and SWPPP indicate that the rain gardens are intended to be a pretreatment practice,
which will convey runoff to the drywells, in a manner similar to swales. However, the
rain garden details incorporate a stone reservoir of either 1-ft or 3-ft depth and note that this
layer is required for additional storage. As designed, these practices to not meet the design
intent outlined in the NYS SMDM for either a rain garden or a ve
stone reservoir will act similar to an infiltration trench, instead of providing a means of filtering
and conveyance. The Applicant shall revise the design to provide
method.
5.It appears that the Applicant has completed two percolation testt # 11056-
111227-01. The results varied from 26 sec to 2 min 08 sec per inch. However, in the HydroCAD
modeling the Applicant has used an exfiltration rate of 60 in/hrhe Applicant shall
use the slower value found during testing, instead of the average rate of 1 min/inch , in the design
calculations to provide a conservative evaluation.
6.The Applicant shall specifically indicate in the test results if
encountered in test pits 02 or 03.
7.The time of concentration flow path for subcatchment S2 includes an additional length of paved
shallow concentrated flow after the runoff has entered the rain
entered the stormwater management area it will be infiltrated. T Tc
flow path appropriately.
8.The Environmental Control Plan shall be revised to include inlet
basin located at the entrance to the new parking area.
9.The notes depicted on the Environmental Control Details drawing revised to incorporate
only those measures that are applicable to the project site. Spe
ditch or slope stabilization are relevant.
10.The Applicant shall provide clarification regarding construction, the
eastern stormwater practices and landscaping are associated with
and parking area. The Applicant shall specify which stormwater/l
constructed under the current proposal and which, if any, will be constructed at the time of the
future improvements.
11.In addition to the currently proposed parking area, the project plans indicate a 2,600SF potential
future commercial building adjacent to Main Street, as well as an additional future parking area. It
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Town of Queensbury
Site Plan 21-2012 Ben Aronson
April 3, 2012
Page 3
appears that the stormwater management practices have been sized
handle these future improvements, with respect to the 50-year design storm. However, it shall be
noted that any changes made to the current plan, with respect toonstruction of these future
facilities, will be subject to additional site plan review. More specificall
affecting site hydrology must be re-evaluated for the 50-year return interval storm.
12.The plans indicate that a light pole will be installed within the limits of rain garden A, with a 4-ft
deep buried concrete foundation. Based upon the rain garden deta
to a 4-ft depth along the length of the practice. As such, it can be assumed that the stone reservoir
will become saturated under large storm events, creating the potcompromise the pole
foundation. The Applicant should consider relocating this light pole or shall provide appropriate
protection measures.
In addition, there is a call out on the Parking Plan that indicates Lighting and points to a location
within rain garden B. However, it does not appear that a light
Applicant shall clarify.
Conclusions and Recommendations
It is our opinion that the applicant should provide clarification for the above items and incorporate the
changes in subsequent plan submissions.
If you have any questions regarding the above, please do not hes-1926.
Sincerely,
Sean M. Doty, P.E., LEED AP
Senior Project Engineer
cc: Pam Whiting, Town Planning Office Administrator (via email)
Keith Oborne, Town Planner (via email)
Joel Bianchi, P.E., Senior Director - Municipal Engineering (via email)
File
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