HomeMy WebLinkAbout20191216 Louden Road subdivision Engineers comments 6-26-20 THE CAPITAL DISTRICT OFFICE
Ghazn Civil Engineers
Land Surveyors 547 River Street
Planners Troy, NY 12180
COM PAN I ES° Environmental&Safety Professionals
Landscape Architects P: 518.273.0055 or 888.539.9073
Proud to be Employee Owned Transportation Planners&Engineers www.chazencompanies.com
June 26, 2020
Ms. Susan Barden,AICP
Principal Planner
City of Saratoga Springs Planning Office
474 Broadway
Saratoga Springs, NY 12866
Delivered via email: susan.barden@saratoga-springs.org
Re: City Designated Engineer Services for Subdivision application—1St Submittal
Kaydeross Ave East Conservation Subdivision
227 Kaydeross Avenue East, City of Saratoga Springs, Saratoga County, New York
City Project No. PB# 17.006.1
Chazen Project No. 32004.03
Dear Susan:
The Chazen Companies (Chazen) have completed our review of the following materials received:
• Subdivision application package containing:
o Application for Subdivision Review dated 03/16/2020
o Preliminary/Final Subdivision Approval Required Submittal Checklist, prepared by The LA
Group, PC, dated 03/16/2020.
o Complete Streets Checklist dated 03/16/2020.
o New Water Service Agreement&Application Form dated 03/16/2020.
o SEQRA Full Environmental Assessment Form, prepared by The LA Group, PC,dated 03/16/2020.
o Stormwater Pollution Prevention Plan, prepared by The LA Group, dated 04/08/2020.
• Site drawings entitled "Kaydeross Avenue East Conservation Subdivision", dated 04/08/2020, prepared
by The LA Group, unless noted otherwise, consisting of the following sheets:
o Cover Sheet
o S-1 Subdivision Map
o S-2 Subdivision Map
o L-1.0 Existing Conditions
o L-2.0 Conservation Analysis
o L-3.0, 3.1, 3.2 Site Clearing, Erosion &Sediment Control Plan
o L-4.0,4.1, 4.2 Site Layout Plan
o L-5.0, 5.1, 5.2 Site Grading and Drainage Plan
o L-7.0 Road/Utility Profile& Sections
o L-8.0, 8.3, 8.4, 8.5 Site Utility Details
Hudson Valley• Capital District• North Country•Westchester
Nashville• Chattanooga Portland
Chazen Engineering, Land Surveying& Landscape Architecture Co. DPC(NY) • Chazen Engineering Consultants, LLC(TN/OR)
Kaydeross Avenue East Conservation Subdivision—P617.006.1-15t Submittal Review
June 26,2020
Page 2 of 5
Following are our observations/comments:
General:
1. It should be noted that an estimate of construction costs and a project narrative was not provided with
this submission.
2. The Management Plan indicates that the open space lands will be owned by the owners of Lot 1 and
Lot 15, and are proposed to be managed by the City of Saratoga Springs. A maintenance agreement
between the City and the property owners will need to be established if the City is willing to accept
management responsibilities
Subdivision Plans
3. The Subdivision Plat must be signed/sealed by the licensed land surveyor.
4. Please provide a boundary and topographic survey map signed and sealed by the licensed land
surveyor.
5. Please label on the Subdivision Plat the minimum permeable area required as well as the maximum
impermeable area allowed for each lot.
6. In accordance with City subdivision requirements (City Code Chapter 241, Appendix H—General
Requirements and Subdivision Design Standards, Section 2-R), all applicants for proposed subdivisions
are to offer the City 10%Class A Type Usable Land, or an acceptable alternative defined in the City
Code.The plans do not indicate any land that has been offered to the City. Please identify how the
code requirement will be met.
7. In accordance with City Code Chapter 241, Article IV, Section 1, Paragraph C.3,the Subdivision Plat
shall identify the location, use, ownership, management, methods of preservation, and rights of the
owners and the public to the open space land subject to the deed restriction. Please add appropriate
notations.
8. It appears that the existing and proposed contours are missing from sheet L-5.2 Site Grading and
Drainage Plan.
9. Please detail the proposed septic system layout on the plans, showing the laterals, septic tank and
distribution box locations for each lot with dimensions.
10. Indicate the proposed invert elevations of all septic system components along with top of concrete
and the finished grades over each component.
11. Certification and tightness testing requirements for the septic system, in accordance with NYSDOH
standards, shall be indicated on the plans.
12. Indicate the locations of existing and proposed utilities (gas, electric, cable, etc.) on the Utility Plans.
Kaydeross Avenue East Conservation Subdivision—PB17.006.1—15t Submittal Review
June 26,2020
Page 3 of 5
13. Inverts and pipe sizes of proposed driveway culverts shall be indicated on the plans to ensure
sufficient cover over the pipes.
14. Proposed road geometry shall be designed such that the turn around radius of a fire truck can be
accommodated. Please verify.
15. Based upon the City Subdivision regulations,this road could be classified as a Rural Road which
requires a pavement width of 24-feet with a 55-ft ROW.The road section provided depicts a
pavement width of 22-ft. Please revise the plans and update the SWPPP accordingly.
16. In accordance with the NYSDOH Appendix 75-A Wastewater Treatment Standards and the New York
State Design Standards for Intermediate Sized Wastewater Treatment Systems (Design Standards),
Section B.4.b,two percolations tests should be performed within the limits of each proposed sewage
treatment system. Additional percolation tests should be performed in accordance with these
standards.
17. In accordance with Section E.2 of the Design Standards, conventional soil-based treatment systems
should be avoided if the percolation rate is slower than 60 mpi.The soil tests provided indicate a
percolation rate of"greater than 60 mpi". Please indicate the actual percolation rates on the plans to
clarify if the percolation rate is slower or faster than 60 mpi. If the percolation rate is slower than 60
mpi, a conventional soil-based treatment system would not be suitable. Provide design calculations
providing appropriate application rates based on soil testing to justify the size of each septic system
for on each lot. It appears that the septic system areas shown accommodate seven (7)60-ft laterals at
6-ft on center.
18. Test pit results indicate seasonally high water between 16 inches and 42 inches. Please show
proposed finished grade at each septic system location to ensure the required separation to
groundwater is satisfied, and that the proposed mound system can fit on the site while maintaining
required property line setbacks.
19. In accordance with NYSDOH standards, septic systems shall not be located where existing grades
exceed a 15%slope. It appears lots 12 and 13 appear to exceed 15%slopes. Please review existing
slopes on these sites to ensure the systems are not located on slopes steeper than 15%.
20. Watertight frames and covers shall be provided on all underground structures.
21. As previously noted,test pits indicated seasonally high ground water between 16 and 42 inches deep.
Underground structures do not appear to include any anti-flotation measures. Please provide
buoyancy calculations for underground structures.
22. Construction details for proposed stormwater pocket ponds and wet swales shall be provided,
meeting the requirements indicated in the New York State Stormwater Management Design Manual
(NYSSMDM).
Kaydeross Avenue East Conservation Subdivision—P617.006.1-15t Submittal Review
June 26,2020
Page 4 of 5
23. Water mains in cul-de-sacs and dead-end streets shall be installed at a depth of six feet, per City Code
Chapter 241 Subdivision Regulations. It does not appear that the proposed water main meets this
requirement. Please confirm and revise the profiles accordingly.
24. Proposed utilities (gas, electric,telephone) services shall be placed within the right-of-way.The final
plat shall include statements that the appropriate company or agency shall approve the design for all
utilities.
25. Due to seasonally high groundwater conditions throughout the site, a geotechnical investigation shall
be performed to evaluate whether the standard pavement section is suitable for these conditions or if
a greater than standard pavement section is required.
26. Based on the profile, it appears that portions of the proposed road will be cutting into the seasonally
high groundwater elevations. As such, dewatering provisions for constructing roadways and utilities in
these conditions shall be detailed on the plans. In order to minimize deterioration of the road due to
freeze/thaw conditions, additional provisions such as perimeter drains will need to be installed.
Engineering Report
27. The water distribution system shall meet both domestic and fire flow requirements. Please provide a
discussion in the report indicating the required demands are capable of being provided.
SWPPP
28. The SWPPP indicates that rooftop disconnect is being applied for proposed houses to treat roof
runoff. According to Chapter 5 of the NYSSMDM, runoff from disconnected rooftop must be directed
to a designated area that is graded for storage and infiltration of the runoff. Please indicate these
areas on the plans to ensure treatment requirements (ie. length, slope, etc.) are satisfied.
29. It appears that subcatchments 2e1 and 3b,which are each directed to a proposed pocket pond,
include the roofs of the proposed houses.The roofs are noted as being treated via roof top
disconnection. Please clarify whether the roofs are being treated in the proposed pocket ponds, or
treated via rooftop disconnection. If roofs are to be treated by the pocket ponds, please show the
grading that ensures the roof will drain to pocket ponds.
30. Additional design details shall be provided for the proposed stormwater systems (pocket ponds and
wet swales)to ensure the required design standards are in accordance with the design manual.
31. The proposed pocket ponds do not show the required aquatic bench with plantings. Please revise the
design accordingly.
32. There is an inconsistency between the size of the vertical orifice of OCS-1 indicated in the hydrocad
model vs detail 8 on sheet L8.1. Please clarify.
Kaydeross Avenue East Conservation Subdivision—P617.006.1-15t Submittal Review
June 26,2020
Page 5 of 5
33. City Code Chapter 242 requires long-term maintenance of the stormwater management practices.The
following notes need to be added to the SWPPP under Post-Construction Operation and Maintenance
of Stormwater Control Devices:
a. "All post-construction stormwater management facilities must be inspected annually by a
qualified professional, a report prepared and submitted to the City Engineer documenting the
inspections as well as the maintenance activities that were completed during the prior year."
b. "The City of Saratoga Springs shall approve a formal maintenance and inspection agreement in
accordance with City Code Chapter 242 for stormwater management facilities to ensure the
practices will be properly operated and maintained in accordance with the long-term
operation and maintenance plans. This agreement shall be binding on all subsequent
landowners and recorded in the office of the County Clerk as a deed restriction on the
property." A draft maintenance agreement should be provided and shall be reviewed by the
City and City's counsel.
In order to expedite and simplify the review of revised materials we would appreciate if the next submission
be accompanied by a response letter that describes the revised materials and how our comments were/were
not integrated.
If you have any comments, questions or need additional information, please do not hesitate to contact this
office at 518-273-0055.
Sincerely,
•.\ lis
Jessica Brown, P.E.
Project Engineer
cc: James J. Connors, P.E. Chazen
Jennifer Nechamen, P.E. Chazen
File
Z:\projects\32000-32099\32004.xx C Saratoga Springs Master\32004-03_KayderossAveEastConserv_sub_PB-20200205\lst submittal\sent\32004-03_KayderossAveEastConserv_sub
PB20200205 Submittal-1.docx