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Home My WebLink AboutNYS DEC Rye Brook Estate Dam Rehabilitation Design 2021-9-10 NET YORK STATE DEPARTMENT OF ENMRON MIENTAL C 0NSER VAT 10N Division of Envirunmvnkal Pvrrni Ngian 3 NEW Vole[ Department of 21 Sav4h Putt Corners Road,New PaIM NY 12�61-1620 STATE Of P:te45)256-3064 1 F:(845)25�4 59 OPPOMNITr` Environmental w clec-ny,9cv Conservation September 10, 2021 Wendell R. Buckman, P.E. Barton and Loguidice 443 Electronics Parkway Liverpool NY 13088 Re: Rye Brook Estates Dam Rehabilitation Design DEC ID: 3-5548-00086/00003 Article 15 Protection of Waters — Dam Safety Village of Rye Brook, Westchester County Third Notice of Incomplete Application Dear Wendell Buckman, The New York State Department of Environmental Conservation (Department or DEC) has reviewed the resubmission materials above referenced project, received on June 8, 2021 and submitted on behalf of the Hidden Falls at Rye Brook HOA. The applicant proposes to rehabilitate the Rye Brook Estates Dam [ID# 232-4333, Class B], a 140- foot-long concrete and stone masonry dam on Tributaries of Blind Brook [Water Index No. LIS 11-9 & P1098B, Class C]. The rehabilitation of the dam will include pouring new concrete cheek walls along the adjacent banks of the dam to raise the height of the structural portion and contain flow within the spillway. Based on our review of the submitted resubmission materials, Department staff have determined that the application is incomplete. Please submit the following items for the Department to continue its review: Article 15 Protection of Waters — Dam Safety To continue the processing of this application, please see the attached memo, dated September 1, 2021 , and provide the requested information. All technical questions should be addressed to John Smith by phone at (518) 408-0338, or by email at iohn.smith(o-)_dec.ny.gov. Your application will remain as incomplete until all information requested is received, as Uniform Procedures Act (UPA) provisions § 621.6(e) allow. Please provide two hard copies and an electronic copy of all resubmission materials. Please reference DEC ID# 3-5548-00086/00003. If you have any questions regarding the above request, please contact me via email at Alysse.Devi ne(a-)-dec.ny.gov. Page 1 of 2 Sincerely, Alysse Devine Division of Environmental Permits Enc: Dam Safety Memo dated September 1, 2021 Ecc: Steven Mintz, Hidden Falls at Rye Brook HOA John Smith, NYSDEC Village of Rye Brook Page 2of2 NEW YOFtK STATE DEPARTMENT OF ENVIRONMENTAL CONSERVATION Gmoon of Water.Burtilu of Flood Pralvcflon wnd Dom Safety 625 EBroadway-A4bany,New York 12233-3504 P:[518i 402-8t85 IF:i51%402-9029 wwV'J,'doc 11y,V$M MEMORANDUM TO: Alysse R. Devine, Region 3, Environmental Permits FROM: John Smith, P".E., Dam Safety Central Office C. Manju Cherian, Regional Water Engineer - Berhanu Confa, P.E., White Plains Office Alert Deminitz. P.E,. Dam Safety Section Chief Josh Johnsen, E,LT._ assistant Environmental Engineer SUBJECT: Rye Brook Estates Gam DEC Application ID#_ 3-5548-00086100003 DEC Darn ID#; 232-433 Village of lye Brook, Westchester County DATE: September 1, 2021 1 have completed my review of the resubmitted dam permit application materials for the above referenced dam, which included the following materials- * May 25, 2021 letter (2021 Letter) by ' ertdell R. Buckman, N S P-E-# 084063, from Barton & Loguifte (13K), with responses to the Department's May 5, 2021 letter. stamped and signed, received June 8, 2021 via email with attachments to the email- * November 23, 2020 letter (2020 letter) by Wendell R. Buckman. NYS P.E.4 084003, from Barton & Loguidice, with responses to the Department's June 24. 2020 letter. unstamped and signed, received December ber 2., 2020 vie email with attachments to the email. Is Annual Certification for the 2021 calendar year- s Emergency Action Flan (EAP), * Inspection & Maintenance {I&M) Plan, received December 2, 2020. ■ Revised Supplement D-1, received December 2, 2020. * Drawing Sheets OP-1 and DP-2 dated May 2021 , unstamlped and unsigned, received June 8, 2021 . + N SDOT Concrete Specification, received December 2. 2020. * Updated Stability Analysis (2011 Stability Analysis), last revised May 23, 2021 and received June 8, 2021. HEC-HMS (version 4.3) ,Models, received vie email December 2, 2020- Joint Application POrm, received April 15, 2020 NSW TRRFSDepiftment of srArr c Envfertnmental �ans�rw+atJ�rl • Location Map, received April 15, 2020. • FHWA HY8 input model, received June 8, 2021 . • Tailwater analysis, received June 8, 2021 . • Time of Concentration calculation worksheet with an included topographical segment map, received June 8, 2021. • Schedule of Construction Inspection Activities, as included in the revised exhibit 2, received via email December 2, 2020. 1 consider the application to be complete. The below comments, however, must be resolved before I am ready to recommend issuance of a dam safety permit. Comments Miscellaneous 1. Please provide a cover letter with each of the below comments and a narrative response indicating what changes, additional documentation, etc. have been provided to respond to the comment. 2. Please provide a report, as stamped by an engineer licensed to practice in NYS, which includes the last version of the documents submitted so far for this permit, including, but not limited to, the below listed items. The EAP, Engineering Assessment, Inspection & Maintenance Plan, and Annual Certification do not need to be resubmitted unless there are changes. i. Supplement D-1 Form. ii. Joint Application Form. iii. Location Map. iv. Calculations. V. Drawings. vi. Schedule of Construction Inspection Activities. vii. Project Description. viii. Specifications. Drawings 3. The updated drawings have not been signed or stamped. Please have the drawings stamped and signed by an engineer licensed to practice in NYS. Structural Stability 4. 2011 Stability Analysis, Case 3, Spillway Design Flood Loading Case (SDFLC). The employed uplift force is the same as the one used in the Normal Loading Case (NLC) despite the pressures at the heel and toe being higher in the SDFLC. Please explain why the employed uplift force used in the SDFLF is conservative in this situation. 5. The force caused by the upstream silt has not been considered in any the loading cases. Was the presence and extent of silt in the upstream face confirmed? 6. 2021 Stability Analysis, Case 3, Spillway Design Flood Loading Case (SDFLC). Please provide the basis for the 4-foot saturated overburden used in this loading scenario. 7. 2021 Stability Analysis, SDFLC, Sliding Stability, Factor of Safety Formula. The horizontal downstream tailwater force, which appears to have been calculated as 1 .16, has been placed in the numerator of the formula whereas Equation 4-3 in USACE EM 1110-2-2200 "Gravity Dam Design" (USACE Manual) requires that this term be placed in the denominator. Please explain why this deviation from the USACE Manual is conservative in this situation. 8. You correctly find the location of the resultant force for the Normal Loading Condition. Please include calculations to prove that the resultant force lands within the appropriate portion of the dam for the other three cases, as directed in section 10.7.2 of the NYS Guidelines for Design of Dams. Hydrologic & Hydraulic 9. The Lag time used within the HEC-HMS model is longer, and less conservative, when compared to the Lag Time correlated to the provided calculation for time of concentration. Please explain this apparent contradiction or revise your H&H models, gravity analysis and Supplement D-1 form. 10.Please provide the spreadsheet file used in the Tailwater Analysis. If you have any questions, please feel free to contact me by phone at 518- 4080338, or by e-mail at iohn.smith(a�dec.ny.gov.