Engineering comments THE.
ChaNorth Country Office
K,L 375 Bay Road, Queensbury, NY 12804
P: (518) 812-0513 F: (518) 812-2205
COMPAN (E fx" www.chazencompanies.com
Prood M be P"mployee 0woe
Engineers Hudson Valley Office (845)454-3980
Land Surveyors Capital District Office (518) 273-0055
Planners
Environmental Professionals
Landscape Architects
August 10, 2016
Mr. Craig Brown
Zoning Administrator and Code Compliance Officer
Town of Queensbury
742 Bay Road
Queensbury, New York 12804
Delivered via email only: Craig@�ueensbury.net
Re: Dale Baldwin
Town of Queensbury, Warren County, New York
Chazen Project#91600.40
Queensbury Ref#PZ201-2016
Dear Mr. Brown:
The Chazen Companies (Chazen) has received a submission package from your office for the above
referenced project. The applicant intends to construct a 2,800 square feet car-hop style restaurant,
2,500 square feet fruit/vegetable stand building, and associated utilities. Submitted information
includes the following:
• Site Plans and Details prepared by Hutchins Engineering, dated July 15, 2016;
• Architectural Plans prepared by Robert F. Niedermeyer, dated April 20, 2016;
• Survey plan prepared by Van Dusen &Steves Land surveyors, dated May 4, 2016;
• Stormwater Report and SWPPP prepared by Hutchins Engineering, dated July 12, 2016; and,
• Site Plan Review Application and project narrative.
Your office has requested that we limit our review to the design of stormwater system as it relates to
compliance to local, state or relevant codes and regulations. Based upon our review, Chazen offers the
following comments for the Town's consideration:
Stormwater Management& Erosion and Sediment Control:
1. The project proposes to disturb an area of 3.8 acres and requires the preparation of a
Stormwater Pollution Prevention Plan (SWPPP) in accordance with GP-0-15-002 that includes
erosion and sediment controls as well as post construction stormwater management practices.
A Stormwater Report has been provided. Comments relating to the Stormwater Management
Report are offered below.
Chazen Engineering, Land Surveying&Landscape Architecture Co., D.P.C.
Chazen Environmental Services, Inc.
The Chazen Companies, Inc.
Town of Queensbury
Dale Baldwin
August 10,2016
Page 2
2. The SWPPP does not appear to contain the inspection requirements in accordance with Part IV
of the General Permit 0-15-002. The Applicant to revise the SWPPP to include the inspection
requirements per GP 0-15-002.
3. It does not appear that Section 14.0 Operation and Maintenance Plan of the SWPPP includes the
subsurface infiltration unit maintenance/operation procedures. The Applicant to revise the
SWPPP to include the subsurface unit manufacturer's operation and maintenance procedures.
4. In accordance with Part I.F.8 of the SPDES General Permit concerning construction activities that
may affect historic property, the Applicant is sending an inquiry to NYSOPRHP. The Applicant
shall provide the Town with any document regarding the above determination and incorporate
the same into the SWPPP pursuant to Part I.F.8 of the SPDES General Permit.
5. This project falls within the Lake George watershed and will be subject to the requirements of
Section 147-11 of the Town code, for Projects within the Lake George Park, and is considered a
major project.
6. Both of the site entrances appear to be within the NYS Route 149 and 9L right-of-way. Since
NYS Route 149 and 9L are both NYSDOT Roads, highway work permits will be required to
construct the entrances.
7. Section 6.3.1 of the NYSDEC SMDM states that geotechnical testing must be performed within
the limits of each infiltration facility to determine the infiltration rate as well as confirm
adequate separate distance from seasonally high groundwater and bedrock (minimum 3-feet). It
does not appear that the testing was performed to a depth to conform the 3-feet of separation;
test pit #3 was performed to a depth of 404' and the bottom of the subsurface infiltration
facility is at 403'. As such, additional testing must be performed to confirm adequate separation
from seasonally high groundwater (minimum 3-feet) at these locations. Chazen would not take
exception to testing being performed at the start of construction; as long as the town does not
take exception. However, it shall be noted that if any design changes occur because of
discovered inconsistency in soil conditions, the project may be subject to additional site plan
review. The Applicant shall notify the Town prior to advancing the soil testing; such that the
Town can witness the testing, if they so choose.
8. The existing condition time of concentration flow path does not appear to be the most hydraulic
remote point in the watershed; the Applicant to revise. The existing condition HydroCAD model
for subcatchment 1S shows 100 feet of sheet flow on smooth surfaces, which does not appear
to be correct based on the watershed map; the Applicant to revise. The existing condition time
of concentration flow path for shallow concentrated flow is modeled as 3% slope, however the
Tc line on the watershed map appears to be along a slope of 1.2%; the Applicant to revise.
9. The HydroCAD model lists the primary and secondary outlets for pretreatment area 2P as a
3"x3" horizontal/orifice grate and a 12'x8' broad crested rectangular weir; however it appears
on the site plan that the outlet is 2-12" culverts. The Applicant to revise the HydroCAD model or
site plan accordingly.
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Town of Queensbury
Dale Baldwin
August 10,2016
Page 3
10. The stone envelope in Pond 3AP in the HydroCAD model (15' wide by 100' long) appears to be
slightly smaller than the site plan (22' wide by 150' long) depicts the stone envelope; the
Applicant to revise either the site plan or HydroCAD accordingly.
11. The test pit results on sheet S2 do not appear to show infiltration tests to verify the 10
inches/hour infiltration in the HydroCAD model. The Applicant to clarify if infiltration tests were
performed during the test pits and provide the results. Infiltration tests are required for
infiltration devices in accordance with Appendix D of the NYS SMDM.
12. The proposed condition HydroCAD model shall be revised to match the site plan. It appears that
pretreatment area 3P flows to two separate areas (an infiltration basin and an infiltration
basin/subsurface units); the HydroCAD model does not depict the two separate areas. It appears
that the HydroCAD model does not include the catch basin inlet to the subsurface units. The
Applicant to revise accordingly.
13. The subcatchment inputs (percent impervious cover and areas) on the Water Quality volume
sheet do not appear to match the HydroCAD model. The Applicant to revise the Water Quality
volume calculations accordingly. A full review of the WQv, RRv, and pretreatment calculations
will be performed once the WQv calculations are revised.
14. The Applicant should depict the time of concentration flow paths on the post development
watershed map.
15. It is unclear where the emergency overflow swale terminates. The swale is proposed to leave
the basin and run southerly to a wooded area, however the existing topographic information
does not extend to the proposed terminus of the swale. It is unclear if the terminus is higher
than the swale itself.The Applicant to clarify.
16. It is noted that the proposed stormwater management plan includes a subsurface infiltration
system (chambers) under the bottom of an infiltration basin. It is requested that the Applicant
provide information regarding design intent for this configuration.
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Town of Queensbury
Dale Baldwin
August 10,2016
Page 4
In the event the Planning Board or Town staff have any questions or require additional information,
please do not hesitate to contact me at (518) 824-1926.
Sincerely,
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Sean M. Doty, P.E., LEED AP
Principal
Manager, Municipal Engineering Services
cc: Sunny Sweet,Town Planning Office Administrator(via email)
Laura Moore,Town Land Use Planner(via e-mail)
File
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