https://sleepyhollow.localarchives.org/files/original/012a0a8d5fec976d9ec98bc74280e70f.pdf 9f0596ee383d909b95477fc40a7cc5d1 PDF Text Text * PLANNING BOARD meeting - July 31, 1986 Present: James Galgano, Chairman Robert P e i r c e , Council James Margotta, Building I n s p e c t o r Raymond Dool John 0 1 Leary Ray Windas Prank Rey The Planning Board met on J u l y 31 to f u r t h e r discuss the s i t e plan of Tarry town Realty Corp. (Mr. George Kahn). (The following notes were taken by the Clerk beginning a t approximately 8:00 p.m.) There was a general discussion r e g a r d i n g Tarrytown Realty Corp. ' s proposed s i t e plan. John O'Leary made a motion to contact Mr. Kahn and ask him to resubmit h i s s i t e plan a p p l i c a t i o n to t h i s board and t h a t he w i l l i n c o r p o r a t e in the s i t e plan the 5 proposals t h a t he submitted in h i s June 2 l e t t e r as amended and in accordance with s e c t i o n 62-30, paragraph c of the v i l l a g e code, t h a t as a condition of the passage of the s i t e p l a n , landscaping and greening s h a l l be maintained and continued maintenance of the use to which they a r e appurtenant. Prank Rey seconded the motion; a l l voted in favor. After a general discussion regarding business a c t i v i t i e s on Route 9, i t was moved by John O'Leary t h a t Whereas, numerous e n t e r p r i s e s l o c a t e d on Route 9 in the V i l l a g e of North Tarrytown deal with automotive r e l a t e d a c t i v i t i e s , and, Whereas, the Planning Board of the Village of North Tarrytown views the number of these businesses as excessive and, Whereas, the excessive number of these b u s i n e s s e s adds to the v i l l a g e ' s t r a f f i c problems and i n c r e a s e s the p u b l i c perception of t h i s section as a "Gasoline Alley", t h e r e f o r e be i t Resolved, t h a t the Planning Board of the Village of North Tarrytown go on record supporting a reduction in the number of these e n t e r p r i s e s by a t t r i t i o n , and be i t F u r t h e r resolved, t h a t 'this Board r e q u e s t s t h a t the Mayor and the Board of Trustees determine a s a t i s f a c t o r y number of these automotive e n t e r p r i s e s and enact a p p r o p r i a t e l e g i s l a t i o n which w i l l e f f e c t i v e l y accomplish the goal of fewer of b u s i n e s s e s d e a l i n g in t h i s industry l o c a t e d on the Route 9 s e c t i o n of the Village. Seconded by Raymond Dool; a l l voted in favor. �After discussion, it was moved by John O'Leary that **" Whereas, urban county "block grant money is available to local municipalities for sidewalk and lighting renovations and, Whereas, some municipalities who have taken advantage of these monies-e.g. Hastings and Tarrytown-have dramatically improved their downtown areas aiding their merchants in attracting new business, Therefore, be it resolved that the Planning Board of the Village of North Tarrytown go on record in support of this program for our village and be it Further resolved, that a copy of this resolution be forwarded to the Mayor and the Board of Trustees with'the request that they investigate this program and take the steps necessary to implement it. Seconded by Raymond Dool; all voted in favor. Meeting adjourned at 9: 10 p.m. Respectfully submitted, Lynn Murray 8/5/86 • �IMVENTOtY AKD IVALQATIOfl 1EQPKSTED BY: R. Thomas Homan, Administrator Village of North Tarrytown LOCATION; Hunter Avenue - Farrington Avenue Storm Drain System ASSISTED BY; James B. Cropper, District Conservationist DATE: September 8, 1986 SITUATION; A recent rainstorm of 5.32 inches in 9 hours on August 7 caused localized flooding in the area between Farrington Avenue and Hunter Avenue and in the backyard of a new home being built at the southeast corner lot of Bellwood and Farrington Avenue. The storm drain system serving this area must handle approximately 30 acres of watershed. Between Kelburne Avenue and Bellwood Avenue along North Broadway, some street water from North Broadway could also drain into this area under particularly severe storm events if catch basins along the west gutter could not handle all inflow due to debris build-up at their inlets or a flow rate above their capacity to accept. On August 14, 1986, at your request, 1 investigated the storm drain system beginning at Farrington and Bellwood down to the outlet north of Hunter Avenue. At Farrington and Bellwood there is an 18-inch diameter reinforced concrete pipe main storm drain that runs down the east side of Bellwood. This line terminates at a low spot in Bellwood between Farrington and Hunter Avenues. It runs across and underneath Bellwood Avenue in a box culvert 2 feet by 20 inches. This section of box culvert continues approximately 12 feet into the residential property west of Bellwood before going, into an 18inch culvert that descends down the hill to a manhole at the back of 144 Hunter Avenue. The box culvert section west of Bellwood was partially obstructed by tree roots and by a crossing pipe of unknown origin or usage. Inlet capacity at the catch basin over this box culvert would be an estimated 14-cubic feet per second. This is a maximum value calculated by using orifice control conditions at the entrance of the box culvert below the west catch basin on Bellwood. This is a maximum value that would occur before the Bellwood west curb is overtopped. Overtopping of this curb occurred during the most recent severe storm as evidenced by soil erosion on the hillside descending down toward 144 Hunter Avenue. The neighboring residence east of 144 Hunter Avenue has erected a barrier of flagstone along his back fence to divert water from his yard and make it run down to an 18inch diameter storm drain inlet at the back of 144 Hunter Avenue. Although the storm event of August 7 was a 25-year frequency rainfall event for that storm duration, it is obvious from a hydrologic and hydraulic analysis that a 2-year frequency event could give this storm drain system more water than it can handle because of restrictive inlet conditions. Given too the fact that a resident would build a makeshift water diversion also indicates rather frequent overtopping of the curb at the low spot on Bellwood. A 2year frequency rainfall event has a 50-50 chance of occurring every year. A 25-year event has only a 4 percent chance of occurring yearly. I I" �Inventory and Evaluation R. Thomas Homan, Administrator Village of North Tarrytown September 8, 1986 Page 2 SITUATION: (continued) At Bellwood and Farrington another set of catch basins receive water flowing down Be11wood from the west curb of Be11wood south of Farrington and a short section of Farrington west of the intersection of the two streets. Unfortunately, this is a very small portion of the 30-acre watershed draining down Be 11 wood. Most of the watershed lies east of Be 11 wood. The northwest catch basin at Be11wood and Farrington is situated over a 4' x 5' box culvert. This box culvert angles across the intersection ending at the Jacobsen residence being completed. This box culvert has a restricted outlet, a 2-foot diameter culvert. This culvert outlets into an open stream channel which flows to the 18-inch culvert inlet at the back property line of 144 Hunter Avenue. The purpose of such a large box culvert is unknown. It does carry some spring water flow and is sunk 10.5 feet below the northwest catch basin rim elevation. The 18-inch culvert inlet at the back of 144 Hunter Avenue has a wall built over it to force more water into it and prevent water from flowing onto 144 Hunter Avenue. The maximum amount of water this inlet can handle would be only 22-cubic feet per second. With this inlet and the west catch basin at the low spot at Bellwood working properly with no obstructions, the two inlets could handle the 5 year frequency rainfall event without flooding 144 Hunter Avenue. A 5-year frequency rainfall event has a 20 percent chance of occurring yearly. The 36-inch pipe these two 18-inch storm drain into can handle 55 cubic feet per second at the hydraulic grade determined using the catch basin inlet rim at Hunter Avenue and the manhole rim elevation at the start of the 36-inch pipe. The nominal pipe grade is .041 while the hydraulic grade line is only .023. Capacity was probably calculated based on the pipe grade, which is almost double the hydraulic grade. In this instance, though, under full flow conditions this is not likely to occur because the outlet of the 36-inch storm drain north of Hunter Avenue will undergo some backwater conditions restricting its outflow to 70-cublc feet per second and another 51 acres of watershed from Munroe Avenue must enter this storm drain after it runs down Hunter Avenue from the west. A combined watershed of 81 acres must exit this area through a 36-inch corrugated metal pipe storm drain or drain across the residential lot north of Hunter Avenue which the storm drain traverses through. This storm drain can handle up to a maximum 5-year frequency rainfall event before street flooding would occur. At the Jacobsen residence, an old storm drain was relocated so that a house could be built there. An existing 12-inch smooth pipe storm drain was rerouted for a total distance of 173 feet. Unfortunately, the 77 foot section running between the two manholes in the sideyard was laid too flat. Corrugated metal pipe was used instead of smooth pipe. Given those two changes the storm drain section between the two manholes could only discharge 2.3 cubic feet per second. Meanwhile, the 12-inch pipe coming in �Inventory and Evaluation R. Thomas Homan, Administrator Village of North Tarrytown Septeaber 8, 1986 Page 3 8ITOATI0W: (continued) from Harwood Avenue can discharge up to 8-cubic feet per second. This caused the manhole near the southeast corner of the house to blow-off and sent water running down the unfinished yard washing sediment out into Be11wood and Farrington. The original proposed grade between the two manholes in the yard was to be 32. It actually is only 1.3Z. The Invert of the storm drain at the upper manhole is a foot lower than originally planned. The steepest grade available for the entire 173 feet of new storm drain can only be 2Z. You asked for recommendations on steps to be taken to alleviate flooding in the area between Farrington and Hunter Avenue. RECOHHBNDATIOHS: Often times, the design of storm drain systems predates the construction homes below them or alongside of them. Most generally, storm drains to handle street water will only be designed to handle up to a 5-year frequency storm to keep roads free of water that can cause hydroplaning and possible car accidents and stalled vehicles. However, in this instance, the street drains must be capable of handling more infrequent but heavier rainfall events because their failure can cause flood damage to homes below Bell wood and Farrington. From the Westchester County Best Management Practice Manuals for Stormwater Runoff Control and the Contruction Related Activities, 100-year frequency storm protection is used as the design storm to protect homes from flooding. See copies of the storm sewer standard and lined waterway or outlet standard. For the above standard to be satisfied, a A' x 4' box culvert would have to be installed from the back lot line of 144 Hunter Avenue to the stream outlet north of Hunter Avenue. This would entail replacement of 370 feet of existing storm drain. Its inlet at the wall behind 144 Hunter Avenue would have to have its invert elevation 1.4 feet lower than the present 18-inch inlet is. To keep the stream channel at its present grade would require a small drop box inlet as Illustrated in figure 6-15 in a rural road setting. The west catch basin at Bellwood below Farrington should be rebuilt so that it has a deeper catch basin with an 18-inch storm drain replacing the present 2" x 20" box culvert. This 18-inch culvert should have Its invert 4.75 below the top of the curb. This 18-inch culvert set this deep could connect the existing 18-inch storm drain section below it and avoid the crossover pipe that presently goes through a 2* x 20" box culvert. This catch basin should be inset as in figure 6-16, type F. �Inventory and Evaluation R. Thomas Roman, Administrator Village of North Tarrytown September 8, 1986 Page 4 IJCOhMKMDATIOmS; (continued) The 18-inch storm drain coming down the east side of Bellwood from south of Farrlngton should drop Into the 4' x 5" box culvert that exists under the intersection of Bellwood and Farrlngton. It also would be worthwhile to reset the remaining stub of this 18-inch drain that runs to the southeast catch basin at Bellwood and Farrlngton back towards this 4" x 5~ box culvert. You may also want to put in an extra catch basin in over the top of the 4' x 5' culvert where it Intersects the east curb of Bellwood. This catch basin should be inset. See figure 6-16, type F. The 2 foot culvert that forms the outlet of this 4' x 5' box culvert should be upgraded to a 30"-diameter reinforced concrete pipe or a 36"-diameter corrugated metal pipe. With this system in place, flooding should cease other than in the area along the open stream channel. Oversized catch basins should be placed over the 4' x 4' box culvert at Hunter Avenue at both curbs to take excess street water into the box culvert readily. A stop gap measure would be to delete the 4' x 4' box culvert and just replace the 18-inch storm drain between the wall and the manhole at 144 Hunter Avenue. All the other recommendations would still have to be followed, but it would only provide up to 10-year frequency storm level protection. At the Jacobsen residence, the present corrugated metal pipe should be replaced with a 15-inch diameter PVC pipe reset to a grade of 2X. This will mean resetting the first manhole upstream of the Bellwood and Farrlngton catch basin. It would have to be set 0.6" deeper. This new pipe would handle approximately 7-cubic feet per second at its inlet and up to 11-cubic feet per second in its line. Thl6 would prevent blow-off of the manhole under all but the most severe rainfall conditions. �WESTCHESTER COUNTY CLERK 110 GROVE STREET WHITE PLAINS, N. Y. # 10601 (914) 285-3080 ANDREW J. SPANO COUNTY CLERK CLERK OF THE SUPREME COURT AND COUNTY COURT BRENDA RESNICK FIRST DEPUTY October 28, 1986 LAND RECORDS MICHAEL HOLOWIAK SECOND DEPUTY JOSEPH D'ALBORA DEPUTY RECORDS AND ARCHIVES ORIAL A. REDD SECOND DEPUTY Planning Board Village of North Tarrytown Village Hall 28 Beekman Avenue North Tarrytown, New York 10591 Dear Chairperson: EUGENE S. PAGE DEPUTY DAVID W. CARMICHEAL ARCHIVIST LEGAL DIVISION ANTHONY R. MARASCO SECOND DEPUTY DIANE G. COLLINS DEPUTY Please be advised that there was filed in this office on the 15th day of October, 1986, by the Number 22479, a map entitled SUBDIVISION MAP PREPARED FOR ARMANDO GALELLA, in the Village of North Tarrytown, prepared by Surveyor Charles Riley. Very truly yours, JOHN J. MONGERO DEPUTY CECILIA G. BIKKAL LEGAL ADVISOR Mrs. Laura G. Laibowltz Map Coordinator �AGOSTINO G. PAESE, P. E. N.Y.S. Lie. No. 40011 r Consulting Engineer 7 1 Lakeville Drive, Ossining, N.Y. 10562 (914) 762-22 J 4 SITE PLAN REVIEW AND FIELD INSPECTION OF FORMER PICKWICK POST BUILDING Field inspection of the former Pickvick Post Restaurant site conducted on Tuesday, 11-5-85. Site Plan, sheet SP-1 examined for accuracy and Drainage System reviewed for adequacy. The Village of North Tarry town paved Gordon Ave. and performed certain drainage improvements during 1881. The Village storm water drainage system is adequate to handle the proposed site improvements. Municipal water and sewer system is adequate to service this site. There are no major engineering impediments to site plan .approval. Constructive Comments: Developers engineer (in the interest of his client) should have submitted a topo of the entire site showing the steep topography at rear of lots 299, 298, 297, 286, 295, & 294. With residential structures at the top of the slope (60' h), it would appear that the densely green and steep slope will be with us for a long time. Economic factors preclude any massive walls at the rear of the previously mentioned lots for any further improvements. The use of the lower portion of said lots as a parking site, as is currently being used, is about the best that can be realized. 100^ of 299 & 298 is unusable, 50£ of 297 is unusable, 40$ of 296 is unusable, 30£ of 295 is unusable, and 15$ of 294 is unusable. A total of 7,500 s.f. is unusable land. The Buffer Area requirements (Art. 5, Par. 62-9.C) at the side and rear lines abutting residence district properties could be easily met by the existing green steep slope. Railroad tie wall in disrepair. A concrte crib wall (stone filled), 5' high, would certainly be in order at this location. Storm drainage flows from slope and back of wall could then be connected to the proposed interior catch basin. Existing catch basin at side of existing building should be cleaned and reset for proper and efficient us^e. *—^ Respectfully submitted, // J. FELLOW. AMERICAN SOCIETY OF CIYIL^NGHNEERS MEMBER. NATIONAL SOCIETY OF P R O F E S S I O ^ / L ENGINEERS / ( j^) Q _ '*'"' � Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Planning Board Minutes & Resolutions-1986 Text A resource consisting primarily of words for reading. Examples include books, letters, dissertations, poems, newspapers, articles, archives of mailing lists. Note that facsimiles or images of texts are still of the genre Text. Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource MINS_PLAN_1986-07-31 Subject The topic of the resource Planning Board Minutes & Resolutions-1986 Date A point or period of time associated with an event in the lifecycle of the resource 1986