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06-062 Wetlands and Drainage-Beaver Brook Estates
Common D lassachusetts of Fisheries & Wildlife MassWi/d/ife July 11, 2005 Patrick J. Melnik Esq. Attorney at Law 110 King Street Northampton, MA 01060 Project Name: Beaver Brook Estates — John J. Hanley, Trustee Location: Evergreen Road, Northampton NHESP File # 01 -9552 Dear Attorney Melnik, Wayne F. MacCallum, Director The Natural Heritage & Endangered Species Program (NHESP) of the MA Division of Fisheries & Wildlife has reviewed your letter, draft Conservation Restriction (received 5/20/05) and revised project plans (dated 4/11/05 & 4/13/05) that were submitted to our office for review under the Massachusetts Endangered Species Act (M.G.L. c.13IA) for this site. This project site is located within Estimated and Priority Habitats for the Jefferson Salamander (Arnbystorna jeffersonianum) and Wood Turtle (Clemmys insculpta). These rare wildlife species are state-protected as species of "Special Concern" pursuant to the Massachusetts Endangered Species Act (MESA). During previous meetings with project representatives we discussed the permitting requirements for this gered Species Act (MESA) and its implemenn project under the Massachusetts Endantig regulations (321 CMR 10.00). The NHESP has determined that the proposed work and development of the uplands on this site constitutes a probable "take ", as defined in 321 CMR 10.02. Under MESA, both upland and wetland habitats are protected from "take" which includes "to ... disrupt the nesting, breeding, feeding, or migratory activity." The taking of a species on the state list may be permitted under MESA only if the applicant has avoided, minim z s a long-term i net to the conservation of the local populations of the practicable and provided impacted species. su ortive of the most recent plans submitted for review and has only a few The NHESP is enerall concerns that still remain to be addressed. Our understanding is that area depicted as "No Disturbance n ot clearly protected from clearing or alteration. Portions of the No Disturbance Zone" on the plan are n Zone depicted in Lots 20 -26 that are not necessary for lawns around the houses need to be added to the ons. These forested areas are important upland rare Conservation Restriction (CR) for the following reas wildlife habitat that provide feeding, shelter, and overwintering areas for Jefferson Salamanders as well as providing a migration corridor between habitat features and vernal on the site for both rare wildlife l pools species. The MESA Regulations require that every reasonable effort is made to minimize and mitigate development impacts to rare species habitat on the site and by adding these areas to the CR the limits of work will not change and long -term protection of these habitats will be provided. tivtivw. masstivil Division of Fisheries and Wildlife Field Headquarters, One Rabbit Hill Road, Westborough, MA 01581 (508)792-727 0 Fax (508) 792 -7275 An Agency of the Deportment of Fisheries, Wildlife & Environmental Low Enforcement • The Conservation Restriction language requires some revisions in order to be acceptable as net benefit for the impacts proposed. In our meeting with representatives of the applicant on March 21, 2003 we stated that forest management or harvesting of trees is not acceptable or appropriate within this Conservation Restriction, due to the sensitive resources, rare species, and small size of the site. We suggest that either the Conservation Commission or a local land trust be approached to hold the CR. The NHESP will only permit new trails on this site provided that these trails are no greater than 4 feet in width and that they are not located within any resource areas (including Riverfront Area) or within any 100 foot buffer zone of a wetland or certified vernal pool. The CR shall be written to allow staff of the NHESP to inspect the protected land within the CR during reasonable hours. Any improvements or alterations that are necessary within the CR must be reviewed and approved by the NHESP in addition to the Grantee. In our letter of July 11, 2003 for this project the NHESP commented that the proposed drainage system shall be designed to maintain the existing hydrology of all vernal pools and wetlands on and adjacent to the site. Please submit details of the proposed stormwater management system and supporting documentation to prove that the existing hydrology will be maintained after construction. The last outstanding issue relevant to this permitting process is compliance with the Massachusetts Environmental Policy Act (MEPA) regulations. Due to the need for a Conservation and Management Permit under MESA for proposed development of this site, filing under the MEPA regulations was required. The MEPA certificate issued on July 24, 2003 for a previous design of this development stated that "this project requires the preparation of an Environmental Impact Report (EIR) ". The NHESP is unable to issue a MESA permit for this project until the MEPA process has been completed. If you have any questions regarding this letter please call Nancy Putnam at ext. 306. Sincerely, Uv- 7.1 AThomasW. French, Ph.D. Assistant Director CC: Northampton Planning Board and Conser'v'ation Commission MEPA Director, Executive Office of Environmental Affairs ■ I L —il Massachusetts 3artment of Environmental Prot*n Bureau of Resource Protection - Wetlands WPA Form 2 — Determination of Applicabilit Massachusetts Wetlands Protection Act M.G.L. c. 131, §40 A. General Information Important: When filling out forms on the computer, use only the tab key to move your cursor - do not use the return key. �I From: Northampton Conservation Commission To: Applicant John Hanley and Patrick Melnik Name 110 King Street Mailing Address Northampton MA 01060 City/Town State Zlp Code Property Owner (if different from applicant): Name Mailing Address State Zip Code City/Town Build Out and Open Space Plan for Beaver Brook Estates Title Multi family Development Plan for Parcel 24 Title Title and Date (or Revised Date if applicable) of Final Plans and Other Documents: Title 2. Date Request Filed: 04/15/2005 B. Determination 04/13/20055 Date 07/27/2005 Date Date Pursuant to the authority of M.G.L. c. 131, § 40, the Conservation Commission considered your Request for Determination of Applicability, with its supporting documentation, and made the following Determination. Project Description (if applicable): Construction of: two multi -unit buildings off of Route 9 as a stand alone cluster, six houses with frontage on Route 9 with common driveways, a 19 unit cluster and utilities, two storm detention basins, two common driveways, a bikepath connector, and removal of a building located at 28 Evergreen Road Project Location: Route 9 and Grove Avenue Street Address 005/006/011 A Assessors Map /Plat Number Northampton City/Town 6,7,12/ 19,20,21,58,61/ 003 Parcel /Lot Number wpaform2.doc • rev. 3/1/05 Page t of 5 ILA Massachusetts partment of Environmental ProtJ&n Bureau of Resource Protection - Wetlands WPA Form 2 — Determination of Applicability Massachusetts Wetlands Protection Act M.G.L. c. 131, §40 B. Determination (cont.) The following Determination (s) is /are applicable to the proposed site and /or project relative to the Wetlands Protection Act and regulations: Positive Determination Note: No work within the jurisdiction of the Wetlands Protection Act may proceed until a final Order of Conditions (issued following submittal of a Notice of Intent or Abbreviated Notice of Intent) or Order of Resource Area Delineation (issued following submittal of Simplified Review ANRAD) has been received from the issuing authority (i.e., Conservation Commission or the Department of Environmental Protection). ❑ 1. The area described on the referenced plan(s) is an area subject to protection under the Act. Removing, filling, dredging, or altering of the area requires the filing of a Notice of Intent. ❑ 2a. The boundary delineations of the following resource areas described on the referenced plan(s) are confirmed as accurate. Therefore, the resource area boundaries confirmed in this Determination are binding as to all decisions rendered pursuant to the Wetlands Protection Act and its regulations regarding such boundaries for as long as this Determination is valid. ❑ 2b. The boundaries of resource areas listed below are not confirmed by this Determination, regardless of whether such boundaries are contained on the plans attached to this Determination or to the Request for Determination. ❑ 3. The work described on referenced plan(s) and document(s) is within an area subject to protection under the Act and will remove, fill, dredge, or alter that area. Therefore, said work requires the filing of a Notice of Intent. ❑ 4. The work described on referenced plan(s) and document(s) is within the Buffer Zone and will alter an Area subject to protection under the Act. Therefore, said work requires the filing of a Notice of Intent or ANRAD Simplified Review (if work is limited to the Buffer Zone). ❑ 5. The area and /or work described on referenced plan(s) and document(s) is subject to review and approval by: Name of Municipality Pursuant to the following municipal wetland ordinance or bylaw: Name Ordinance or Bylaw Citation wpaform2.doc • rev. 3/1/05 Page 2 of 5 ?'Massachusetts partment of Environmental Prot *n Bureau of Resource Protection - Wetlands WPA Form 2 — Determination of Applicability Massachusetts Wetlands Protection Act M.G.L. c. 131, §40 B. Determination (cont.) ❑ 6. The following area and /or work, if any, is subject to a municipal ordinance or bylaw but not subject to the Massachusetts Wetlands Protection Act: ❑ 7. If a Notice of Intent is filed for the work in the Riverfront Area described on referenced plan(s) and document(s), which includes all or part of the work described in the Request, the applicant must consider the following alternatives. (Refer to the wetland regulations at 10.58(4)c. for more information about the scope of alternatives requirements): ❑ Alternatives limited to the lot on which the project is located. ❑ Alternatives limited to the lot on which the project is located, the subdivided lots, and any adjacent lots formerly or presently owned by the same owner. ❑ Alternatives limited to the original parcel on which the project is located, the subdivided parcels, any adjacent parcels, and any other land which can reasonably be obtained within the municipality. ❑ Alternatives extend to any sites which can reasonably be obtained within the appropriate region of the state. Negative Determination Note: No further action under the Wetlands Protection Act is required by the applicant. However, if the Department is requested to issue a Superseding Determination of Applicability, work may not proceed on this project unless the Department fails to act on such request within 35 days of the date the request is post- marked for certified mail or hand delivered to the Department. Work may then proceed at the owner's risk only upon notice to the Department and to the Conservation Commission. Requirements for requests for Superseding Determinations are listed at the end of this document. ® 1. The area described in the Request is not an area subject to protection under the Act or the Buffer Zone. ❑ 2. The work described in the Request is within an area subject to protection under the Act, but will not remove, fiil, dredge, or alter that area. Therefore, said work does not require the filing of a, Notice of Intent. ❑ 3. The work described in the Request is within the Buffer Zone, as defined in the regulations, but will not alter an Area subject to protection under the Act. Therefore, said work does not require the filing of a Notice of Intent, subject to the following conditions (if any). ❑ 4. The work described in the Request is not within an Area subject to protection under the Act (including the Buffer Zone). Therefore, said work does not require the filing of a Notice of Intent, unless and until said work alters an Area subject to protection under the Act. wpaform2.doc • rev. 311/05 Page 3 of 5 fassachusetts jpartment of Environmental Proton Bureau of Resource Protection - Wetlands WPA Form 2 — Determination of Applicability Massachusetts Wetlands Protection Act M.G.L. c. 131, §40 B. Determination (cont.) ❑ 5. The area described in the Request is subject to protection under the Act. Since the work described therein meets the requirements for the following exemption, as specified in the Act and the regulations, no Notice of Intent is required: Exempt Activity (site applicable statuatory/regulatory provisions) ❑ 6. The area and /or work described in the Request is not subject to review and approval by: Name of Municipality Pursuant to a municipal wetlands ordinance or bylaw. A 140MA Di6Rl 1k1 M dR D! + 45 Name I Ordinan ce or Bylaw Citation C. Authorization This Determination is issued to the applicant and delivered as follows: ❑ by hand delivery on 8 by certified mail, return receipt requested on 41 Ay6ugT aods - Date Date This Determination is valid for three years from the date of issuance (except Determinations for Vegetation Management Plans which are valid for the duration of the Plan). This Determination does not relieve the applicant from complying with all other applicable federal, state, or local statutes, ordinances, bylaws, or regulations. This Determination must be signed by a majority of the Conservation Commission. A copy must be sent to the appropriate DEP Regional Office (see Attachment) and the property owner (if different from the applicant). wpaform2.doc • rev. 3/1/05 Page 4 of 5 a.5` U6 5` Date 32 E. Center St. Leeds, MA 01053 February 20, 2006 Secretary Stephen R. Pritchard EOEA, Attn: MEPA Office William Gage, EOEA #13057 100 Cambridge Street, Suite 900 Boston, Ma. 02114 Dear Secretary Pritchard, This letter is in regard to the Notice of Project Change filed for the Beaver Brook Estates Project (EOEA #13057). Atty. Melnick requests "that the Secretary's Certificate issued on July 24, 2003 be rescinded with a new finding made that the project does not require the preparation of an EIR." His request is based on a prediction that because of the project changes, "the Secretary's findings that the area of the site proposed to be developed will have an adverse impact on rare species habitat will be superceded by the Conservation Permit to be issued by Natural Heritage." The proposed changes to the project in fact do not address many of the NHESP concerns, and Atty. Melnick has not complied with NHESP conditions. In fact, one of the NHESP conditions Atty. Melnick has not met is the very one he is trying to have rescinded by MEPA: the preparation of an EIR. Therefore, it is unlikely that NHESP will issue a Conservation Permit, and Atty. Melnick's request should have no claim on your attention. The July 11, 2005 NHESP letter to Attorney Melnick concerning his April 13, 2005 plans required that four conditions be met to complete their permitting process. Atty. Melnick has made the following progress on these conditions: 1. "Portions of the No Disturbance Zone depicted in Lots 20-26 that are not necessary for lawns around the houses need to be added to the Conservation Restriction." For Lots 20, 21, and 22, portions of the No Disturbance Zone have been added to the Conservation Restriction (which now totals 40.40 acres rather than 38.28 acres), as required. However, the houses themselves have been moved farther into the upland habitat, and are now directly in between vernal pools #2018 and 2020. For Lots 23 -26, the current plan is ambiguous, but it appears that less, not more, area around the houses is now under Conservation Restriction, than in the prior plan. 2. "We suggest that either the Conservation Commission or a local land trust be approached to hold the CR." Atty. Melnick states that 16.504 acres (not the 40.40 acres of the Conservation Restriction) is proposed to be conveyed to the City of Northampton. • 3. "Submit details of the proposed stormwater management system and provide supporting documentation to prove that the existing hydrology will be maintained after construction." _ e The Dec. 29, 2005 letter from Mark P. Rod, Director o ��ing and drainage deslgriwill Inc. to NHESP merely states that Thep p project maintain the current hydrology of the existing i.e 1 vegetat or hydrology) around as proposed will not affect the existing conditions or within the certified vernal pools located on the property." No supporting documentation is provided. Further, Mr. Reed is identified only as Director of Engineering and no credentials supporting his qualifications for making such a judgment are provided. 4. "Compliance with the Massachusetts Environmental Policy Act (MEPA) regulations ... (i.e) "the preparation of an Environmental Impact Report (EIR) wildlife study to be Atty. Melnick states that "Natural Heritage is not requiring ll Alan Richmond PhD done beyond the work already done on the site y Y Hale and who have done independent sites studies k the these studies because they don't Salamander." However, Atty. Me exist. He has not completed an EIR. Further, Atty. Mel nick has provided insufficient documentation that the proposed plan area changes mitigate the disturbance to the wetland resource 200 Secretary's the upland rt f of the site. Please deny Atty. Melnick s request that t July requiring the preparation of an EIR be rescinded. Sincerely, Lora siWT iusen Cc: N to Plannin n ere Board and Cons CommilOon � _.-. g pecies Pro am Natural Heritage an En a • PROJECT CHANGE DESCRIPTION The original project, as presented in the original ENF filing in 2003, proposed to construct 24 new single family homes with a cul de sac off of Evergreen Road in the Leeds section of Northampton and a separate 6 unit condominium building to be built off of Route 9 with a curb cut onto Route 9. Access to three of the proposed single family homes was to be via a connecting driveway from Grove Avenue to be utilized as a common driveway. 36 acres of the site were proposed to dedicated to permanent conservation protection with a 6.92 acre parcel to be conveyed to the City of Northampton as permanent open space. Since the filing of the original ENF, and the issuance of the Secretary's certificate on July 24, 2006, there have been several changes to the project. A 4 %2 acre site abutting Route 9 has been sold by John Hanley and is being proposed as a stand alone project of 2 building with 3 units each. An application for a cluster permit from Northampton Planning has been filed for this project and a negative determination of applicability of the Wetlands Protection Act has been issued by the Northampton Conservation Commission. A separate ENF is being filed in connection with this stand alone project. The remaining project has been redesigned to eliminate the proposed access driveway from Grove Avenue to three of the 25 proposed house sites. All access now is proposed to be via the cul de sac from Evergreen Road, if this redesign is approved by Northampton Planning. If the redesign is not approved the plans will be modified to go back to the original driveway from Grove Avenue. The proposed detention basin located on Evergreen Road, and the detention Basin located to the west of vernal pool number 2019, have been eliminated. All drainage will now be channeled into a single detention basin that will not impact the hydrology or water quality of the 4 vernal pools on the site. The City of Northampton took a right of way for a proposed expansion of the bike path now located in the City by the process of eminent domain. The project has been designed to link the proposed development to the new bike path. The area proposed for permanent conservation protection has been increased to 40.40 acres and the parcel of land proposed to be conveyed to the City of Northampton for public open space is increased to 16.504 acres. The Northampton Conservation Commission has reviewed the revised plan and has • issued a negative determination of applicability of the Wetlands Protection Act for the entire proposed development. NHESP has reviewed the proposed changes to the project has indicated that it will act favorably to approve a Conservation Permit with some modifications to the proposed Conservation Restriction. The applicant has submitted the additional informational material requested by Natural Heritage and has changed the configuration of the proposed Conservation Restriction Area as requested by Natural Heritage. Any further requests for changes by Natural Heritage will be incorporated into the plans. Copies of the Negative Determination of Applicability, the letter from Natural Heritage and the drainage analysis from the applicant's engineer has been submitted with the revised plans. All roadways , building development and house sites have been pulled back to be at least 300 feet away fiom the Mill River and 600 feet from Beaver Brook to meet Natural Heritage guidelines for protection of the Wood Turtle. Although no Wood Turtle has ever been identified to be located on this site, the site has been determined to be Wood Turtle habitat by Natural Heritage. The changes to the plans eliminate any potential impact to Wood Turtle habitat. There is a dedicated continuous wildlife corridor to insure that migratory patterns for breeding Jefferson Salamander is unaffected by the development and there will be continuous opportunity for cross breeding between the two vernal pools where Jefferson Salamanders have been located. The applicant is requesting that the Secretary's Certificate issued on July 24, 2003 be rescinded with a new finding made that the project does not require the preparation of an EIR. The Secretary's previous finding that the project will require a "Superceding Order of Conditions" is no longer applicable to the project. There is no need for any filing under the Wetland Protection Act. Further, the Secretary's findings that the area of the site proposed to be developed will have an adverse impact on rare species habitat will be superceded by the Conservation Permit to be issued by Natural Heritage. Natural Heritage will not issue the Conservation Permit until they are satisfied that there is a net long term benefit to the species. Natural Heritage is not requiring a further wildlife habitat study to be done beyond the work already done on the site by Molly Hale and Alan Richmond Ph.D. who have done independent site studies of the breeding patterns of the Jefferson Salamander. Therefore, the applicant would request that the Secretary's Certificate be revised to eliminate the need for further wildlife study if the Certificate is not rescinded entirely. • ATTACHMENTS & SIGNATURES Attachments: 1. Secretary's most recent Certificate on this project 2. Plan showing most recent previously - reviewed proposed build condition 3. Plan showing currently proposed build condition 4. Original U.S.G.S. map or good quality color copy (8 -1/2 x 11 inches or larger) indicating the project location and boundaries 5. List of all agencies and persons to whom the proponent circulated the NPC, in accordance with 301 CMR 11.10(7) Sign es: �� 12/22/20 5 12/22/2005 Date Signature of Responsible Officer Date sYghature of person preparing or Proponent NPC (if different from above) John J. Hanley Patrick J. Melnik Esq. Name (print or type) Name (print or type) Attorney Firm /Agency Firm /Agency 180 Riverside Blvd Apt 29E 110 King St. Street Street N Y NY 10069 Northampton, Ma. 01060 Municipality /State /Zip Municipality /State /Zip 212 - 787 -5158 413- 584 -6750 Phone Phone 4 • Commonwealth of Massachusetts Executive Office of Environmental Affairs ■ MEPA Office NPC Notice of Project Change For Office Use Only Executive Office of Environmental Affairs MEPA Analyst: Phone: 617 -626- The information requested on this form must be completed to begin MEPA Review of a NPC in accordance with the provisions of the Massachusetts Environmental Policy Act and its � .,... +;-- rp, til�thnc igpp 3n1 CMR 11.10011. Project Name:Beaver Brook Estates EOEA #:13057 Street: Evergreen Road and Haydenville Road Municipality: Northampton Watershed: Mill River Universal Tranverse Mercator Coordinates: Latitude: 42- 22 -01 -1 N Longitude: 72- 42 -00 -4 W Status of project construction: 0 °i ncomplete Proponent: John Hanle Street: 180 Riverside Blvd Apt 29E Municipality: New York City State: NY Zip Code: 10069 Name of Contact Person From Whom Copies of this NPC May Be Obtained: Patrick J. Melnik Es q. Firm/Ag Patrick J. Melnik Attorney Street: 110 Kin St. Municipality: Northampton State: Ma P�� 60 Phone: 413- 584 -6750 Fax: 413 -584 -6789 ail: melnik verizon.net In 25 words or less, what is the project change? The project change involves ... Relocation of houses, relocation of detention basin and increase in size of open space parcel. One access roadway has been eliminated. Impact on Rare species is avoided. See full project change description beginning on page 3. Date of ENF filing or publication in the Environmental Monitor June 24, 2003 Was an EIR required? ®Yes ❑No; if yes, was a Draft EIR filed? ❑Yes (Date: ) ®No was a Final EIR filed? ❑Yes (Date: ) ©No was a Single EIR filed? ❑Yes (Date: ) RNo Have other NPCs been filed? ❑Yes (Date(s): ) Nlo If this is a NPC solely for lapse of time (see 301 CMR 11.10(2)) proceed directly to "ATTACHMENTS & SIGNATURES" on page 4. May 2001 • PERMITS / FINANCIAL ASSISTANCE / LAND TRANSFER List or describe all new or modified Act date mnnation August 29, 2005.44 transfers Acre 6 unit p reviously reviewed: Negative We condominium site on Route 9 conveyed to Patrick J. Melnik. Are you requesting a finding that this project change is insignificant? (see 301 CMR 11.10(6)) ❑Yes (XNo; if yes, attach justification. Are you requesting that a Scope in a previously issued Certificate be rescinded? Totes ❑No; if yes, attach he Are you requesting a change to a Scope in a previously issued Certificate? JKYes ❑No; if yes, attach Certificate and describe the change you are requesting: Previously Net Change Currently Summary of Project Size reviewed Proposed & Environmental Impacts LAND 915 59.915 Total site acreage 59. 6 91 Acres of land altered 6.91 3 1.7 Acres of impervious area 2 0 -. 0 Square feet of bordering vegetated 0 wetlands alteration 0 Square feet of other wetland alteration 0 Acres of non -water dependent use of 0 tidelands or waterways 0 STRUCTURES Gross square footage 62,000 62,000 31 Number of housing units 31 35 Maximum height (in feet) 35 TRANSPORTATION Vehicle trips per day 274 274 Parking spaces WATERNVASTEWATER Gallons /day (GPD) of water use 15,000 15,000 15,000 GPD water withdrawal 15,000 13,640 GPD wastewater generation/ treatment 13 ,640 1 Length of water /sewe mains (in miles) .2 - 1 2 • Does the project change involve any new or modified 1. conversion of public parkland or other Article 97 public natural resources to any purpose not in accordance with Article 97? ❑Yes [ZNo 2. release of any conservation restriction, preservation restriction, agricultural preservation restriction, or watershed preservation restriction? FlYes ®No 3. impacts on Estimated Habitat of Rare Species, Vernal Pools, Priority Sites of Rare Species, or Exemplary Natural Communities? MYes ❑No 4. impact on any structure, site or district listed in the State Register of Historic Place or the inventory of Historic and Archaeological Assets of the Commonwealth? FlYes "No; if yes, does the project involve any demolition or destruction of any listed or inventoried historic or archaeological resources? ❑Yes ❑No 5. impact upon an Area of Critical Environmental Concern? ❑Yes [ZNo If you answered `Yes' to any of these 5 questions, explain below: PROJECT CHANGE DESCRIPTION (attach additional pages as necessary). The project change description should include: (a) a brief description of the project as most recently reviewed (b) a description of material changes to the project as previously reviewed, (c) the significance of the proposed changes, with specific reference to the factors listed 301 CMR 11.10(6), and (d) measures that the project is taking to avoid damage to the environment or to minimize and mitigate unavoidable environmental impacts. If the change will involve modification of any previously issued Section 61 Finding, include a proposed modification of the Section 61 Finding (or it will be required in a Supplemental EIR). City of Northampton Department of Public Works STORMWATER MANAGEMENT PERMIT WAIVER APPLICATION DECISION Project / Site Name: Beaver Brook Condo / Multifamily Dev elopment for Parcel 24 Project Street or Location / Assessor ID: Haydenville Rd Leeds MA / Map 06 Parcel 62 Applicant Naine: Patrick J. Melnik Applicant Address /Phone: 311 Chesterfield Rd., Leeds, MA / 584 -6750 Application Submission Date: 3/21/2006 Total Lot Size (ft) : 244,398 Estimated Area to be Disturbed (ft) : 25,600 THE FOLLOWING DECISION BY THE NORTHAMPTON DEPARTMENT OF PUBLIC WORKS HAS BEEN MADE ON THIS WAIVER APPLICATION BASED ON INFORMATION PRESENTED: X Disapproval of the Stormwater Management Permit Waiver Application based upon a determination that the proposed project shall require an approved Stormwater Management Permit as specified in the Northampton Stormwater Management Ordinance (Chapter 22 Article 5). Approval of the Stormwater Management Permit Waiver Application subject to any conditions required by the Northampton Department of Public Works (see conditions below). The Northampton DPW has determined that the project described above is exempt from meeting the stormwater performance standards as outlined in the Northampton Stormwater Management Ordinance (Chapter 22 Article 5) for the following reason: Signature of City Engineer Date cc. ,Planning Board c/o Office of Planning and Development Building Department Conservation Commission c/o Office of Planning and Development EAStonnwater Pennits \Stonn.water Pennits \Waiver Decisions \HaydenviIle Rd. Waiver Decision.doc Page 1 of 1 City of Northampton Department of Public Works STORMWATER MANAGEMENT PERMIT APPLICATION DECISION Project / Site Name: Beaver Brook Estates — Multifamily Development Plan for Parcel 24 Project Street / Location: Haydenville Road.— Route 9 Applicant Name: Patrick J. Melnik, Esq. Applicant Address /Phone: 111 King Street, Northampton MA / 584 -6750 Application Submission Date: 4/4/2006 THE FOLLOWING ACTION BY THE NORTHAMPTON DEPARTMENT OF PUBLIC WORKS HAS BEEN TAKEN ON THIS APPLICATION BASED ON INFORMATION PRESENTED: X Disapproval of the Stormwater Management Permit Application based on a determination within seven days of the receipt of the application that the application is administratively incomplete (see attached documentation). Approval of the Stormwater Management Permit Application. Approval of the Stormwater Management Permit Application subject to any conditions, modifications or restrictions required by the Department of Public Works. Disapproval of the Stormwater Management Permit Application based upon a determination that the proposed plan, as submitted, does not meet the purposes set forth in the Northampton Stormwater Management. Ae54W-f ZgKK -////A/1 Signature of City En ineer Date cc. Planning Board c/o Office of Planning and Development Building Department Conservation Commission c/o Office of Planning and Development i NORTHAMPTON DEPARTMENT OF PUBLIC WORKS NOTICE OF INCOMPLETE APPLICATION STORMWATER MANAGEMENT PERMIT Project / Site Name: Beaver Brook Estates — Multifamily Development Plan for Parcel 24 Project Street / Location: Haydenville Road — Route 9 Applicant Name: Patrick - J. Melnik, Esq. .Applicant Address /Phone: 111 King Street, Northampton, IVIA / 584 -6750 Application Submission Date: 4/4/2006 The Northampton Department of Public Works (DPW) is in receipt of the application for a Stormwater Management Permit for the above referenced project. The application has been found to be incomplete. The timeline for application review and final action by the Northampton DPW will begin once a complete application has been submitted. The application is incomplete for the following reason(s): X The Stormwater Management Permit Application is not complete and /or signed. X The Permit Review and Inspection Fee is not paid. The Operation, Maintenance, and Inspection Agreement was not submitted and /or is not complete. The Stormwater Management Plan and Erosion and Sediment Control Plan are not complete. The following information has not been submitted and /or is not complete: Identif all operators for the project site and the potions over which each operator has control. All plans submitted have been prepared and stamped by a professional engineer licensed by the Commonwealth of Massachusetts The applicant has certified on the drawings that all clearing, grading, drainage, construction, and development shall be conducted in strict accordance with the plan Locus map The existing zoning, and land use at the site The proposed land use The location of existing and proposed easements The location of existing and proposed utilities The site's existing & proposed topography with contours at 2 foot intervals Soils investigation (by a Certified Soil Evaluator or Certified Professional Soil Scientist) including borings or test pits, to a depth greater than 4 ft. below estimated seasonal ground `eater for areas where construction of infiltration practices will occur. Estiunated seasonal high groundwater elevation (November to April) in areas to be used for storm water retention, detention, or infiltration (by a Certified Soil Evaluator or Certified Professional Soil Scientist). A description & delineation of existing stormwater conveyances, impoundments, and wetlands on or adjacent to the site or into which storm water flows. A delineation of 100 -year flood plains, if applicable. The existing and proposed vegetation and ground surfaces with runoff coefficient for each. A drainage area map showing pre and post construction watershed boundaries, drainage area, storm water flow paths, and receiving water. A description and drawings of all components of the proposed drainage system including: 1) the structural details for all components of the proposed drainage systems and storm water management facilities (including size, inverts, and grade); 2) all measures for the detention, retention or infiltration of water; 3) all measures for the protection of water quality; 4) notes on drawings specifying materials to be used, construction specifications, and typicals; 5) the existing and proposed site hydrology with supporting drainage calculations (including the 1,2,10, and 100 year NRCS design storms); 6) proposed improvements including location of buildings or other structures, impervious surfaces, and drainage facilities, if applicable; 7) location, cross sections, and profiles of all potentially impacted brooks, streams, drainage swales and their method of stabilization; and 8) proposed ownership of drainage system structures. Estimate of the total area expected to be disturbed by excavation, grading or other construction activities. A description and location of all measures (i.e., Best Management Practices) that will be implemented as part of the construction activity to control pollutants in storm water discharges. A description of when each control measure will be implemented in the construction schedule, which operator is responsible for the implementation of each control measure and a maintenance and inspection schedule for each control measure during construction. A description of construction and waste materials expected to be stored on -site, and a description of controls to reduce pollutants from these materials including storage practices to minimize exposure of the materials to storm water, and spill prevention and response. Timing, schedules, and sequence of development including clearing, stripping, rough grading, construction, final grading, and vegetative stabilization. Please subunit the necessary items to the Northampton Department of Public Works as soon as possible to start the application review process. For additional information contact Doug McDonald at 413 - 587 -1582 x308 or e -mail at dmcdonald @nohodp�,v.org. DRAINAGE CALCULATIONS MULTIFAMILY DEVELOPMENT FOR PARCEL 24 HAYDENVILLE ROAD NORTHAMPTON, MA Prepared for: John J. Hanley, Trustee The Beaver Brook Nominee Trust 150 West 56"' Street, Apt. 5905 New York, New York 10019 Prepared by: hal, S , INC. Professic? ry e r id Engineers College Hig & Clark Street Post O fice Box 1 Southampton,lA 01073 (413) 527 -3600 HSI No: 3923 - 980831 September 29, 2005 ,IT The drainage report was prepared using the computer program HydroCAD version 7.0 by Applied Microcomputer Systems. The report is broken into three sections. The first section of the drainage calculations (pages 1 -7) are for the 2 year storm event and the next two sections are numbered the same (pages 1 -7) for the 10 and 100 year storm events for the Pre Construction (Existing Conditions) and Post Construction (Post Development). Each section gives a schematic diagram and description of structures used in the analysis. The drainage areas are defined as subcatchments, the detention basin is defined as a pond. A summary for each subcatchment, pond and reach are given for each storm event. The combined peak discharge from the subcatchments and ponds are summed in an undescribed structure (total post construction discharge) called a reach. The drainage analysis is based on soil information obtained from the "Soil survey of Hampshire County, Massachusetts Central part from the U.S. Department of Agriculture, Soil Conservation Service in cooperation with Massachusetts Agricultural Experiment Station", issued 198 Ion Sheet Number 9. The soil groups shown on parcel 24 belong to Hydrologic Soil Group C, Ridgeburg (ReA), Woodbridge (PaB, PbB), Paxton. No infiltration was accounted for within the drainage calculations for the proposed detention basin. There is a decrease in peak runoff from the existing conditions to the post construction condition for the 2, 10 & 100 year stormevents. Table 1: Pre & Post Drainage Calculations 2, 10, 100 Year Storms YEAR PRE- POST- DIFFERENCE STORM CONSTRUCTION CONSTRUCTION IN PEAK DW Ail "11 rusurr. PE DISC HARGE DISCHARGE STORM EVENT y L 0.48 CFS vv 0.44 CFS ELEVATION 2YR SUBCATCHMENT IES REACH #1PR -0.04 CFS 10 YEAR (TOTAL SITE DRAINAGE) (TOTAL SITE DRAINAGE 100 YEAR 1.27 CFS 1.01 CFS 10YR SUBCATCHMENT IES REACH #1PR -0.26 CFS TOTAL SITE DRAINAGE TOTAL SITE DRAINAGE) 2.50 CFS 2.13 CFS 100YR SUBCATCHMENT IES REACH #lPR -0.37 CFS TOTAL SITE DRAINAGE) (TOTAL SITE DRAINAGE) STORM EVENT BASIN #1 PEAK ELEVATION 2 YEAR 403.30 (1.3 FEET) STORM EVENT 10 YEAR 403.53 (1.53 FEET) STORM EVENT 100 YEAR 403.65 (1.65 FEET) STORM EVENT BOTTOM = 402- TOP = 404 1ES EXISTING DRAINAGE AREA PROPO ED BASIN PROPOSED 6 UNIT DEVELOPMENT DRAINAGE TO BASIN 1 PR 2PS�� d� TOTAL POST CONSTRUCTION DISCHARGE PROPOSED 6 UNIT DEVELOPMENT LAWN TO WETLAND Subca Reach, on Link Drainage Diagram for 3923 meinik 6 units Prepared by Heritage Surveys, Inc. 9/28/2005 HydroCAD® 7.00 s/n 000860 ©1986 -2003 Applied Microcomputer Systems 3923 meinik 6 units Type Ill 24 -hr 2 YEAR S EVENT Rainfall= 3.00" Prepared by Heritage Surve *16-2003 ic. Page 2 HydroCADO 7.00 s/n 000860 © Applied Microcomputer Systems 9/28/2005 Time span =0.00 -20.00 hrs, dt =0.05 hrs, 401 points Runoff by SCS TR -20 method, UH =SCS Reach routing by Stor- Ind +Trans method - Pond routing by Stor -Ind method Subcatchment 1 ES: EXISTING DRAINAGE AREA Runoff Area = 35,292 sf Runoff Depth = 0.64" Flow Length=170' Tc =11.7 min CN =70 Runoff =0.48 cfs 0.043 of Subcatchment 1PS: PROPOSED 6 UNIT DEVELOPMENT DRA Runoff Area = 13,613 sf Runoff Depth= 2.04" Tc =5.0 min CN =92 Runoff =0.78 cfs 0.053 of Subcatchment 2PS: PROPOSED 6 UNIT DEVELOPMENT LAW Runoff Area = 19,078 sf Runoff Depth = 0.83" Tc =5.0 min CN =74 Runoff=0.44 cfs 0.030 of Reach 1PR: TOTAL POST CONSTRUCTION DISCHARGE Inflow =0.44 cfs 0.030 of Outflow =0.44 cfs 0.030 of Pond 1PP: PROPOSED BASIN Peak Elev= 403.30' Storage =2,310 cf Inflow =0.78 cfs 0.053 of Outflow =0.00 cfs 0.000 of Total Runoff Area= 1.561 ac Runoff Volume= 0.126 of Average Runoff Depth= 0.97" suns meinlK b units Prepared by Heritage HydroCAD® 7.00 s/n 001 Type I// 24 -hr 2 YEAR STORM EVENT Rainfall nc. Page 3 3-2003 Applied Microcomputer Systems 9/28/2005 Subcatchment 1 ES: EXISTING DRAINAGE AREA Runoff = 0.48 cfs @ 12.19 hrs, Volume= 0.043 af, Depth= 0.64" Runoff by SCS TR -20 method, UH =SCS, Time Span= 0.00 -20.00 hrs, dt= 0.05 hrs Type III 24 -hr 2 YEAR STORM EVENT Rainfall = 3.00" Area (sf) CN Description 35,292 70 Brush, Fair, HSG C Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 9.7 50 0.0400 0.1 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 3.00" 2.0 120 0.0417 1.0 Shallow Concentrated Flow, Woodland Kv= 5.0 fDs 11.7 170 Total Subcatchment 1 ES: EXISTING DRAINAGE AREA Hydrograph 0.5 0.48 Cfs Type 11124 -hr 2 YEAR STORM EVENT 0.45 Rainfali =3.00" Runoff Area= 35,292 sf 0.4 Runoff Volume =0.043 of Runoff Depth = 0.64" 0.35. Flow Length =170' vi Tc =11.7 min 0.3-- cN =70 c - 0.25 U- 0.2 0.15 0.1 0.05 0. 0 1 2 3 4 5 6 7 8 9 1011121314151617181920 Time (hours) ■ Runoff 3923 meinik 6 units Prepared by Heritage Su HvdroCAD® 7.00 s/n 000861 Type Ill 24 -hr 2 YEAR STORM EVENT Rainfall= 3.00" Page 4 Subcatchment 1 PS: PROPOSED 6 UNIT DEVELOPMENT DRAINAGE TO BASIN Runoff = 0.78 cfs @ 12.07 hrs, Volume= 0.053 af, Depth= 2.04" Runoff by SCS TR -20 method, UH =SCS, Time Span= 0.00 -20.00 hrs, dt= 0.05 hrs Type III 24 -hr 2 YEAR STORM EVENT Rainfall =3.W' Area (sf) CN Description 5,414 98 Building 5,017 98 Pavement _ 3,182 74 >75% Grass cover, Good, HSG C 13,613 92 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Subcatchment 1 PS: PROPOSED 6 UNIT DEVELOPMENT DRAINAGE TO BASIN Hydrograph Id 1 0. c 0. 0. 0 N ■ Runoff 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 3923 melnik 6 units Type I// 24-hr 2 YEAR FTORM EVENT Rainfall= 3.00" Prepared by Heritage Surve Page 5 HydroCADO 7.00 s/n 000860 © Applied Microcomputer Systems 9/28/2005 Subcatchment 2PS: PROPOSED 6 UNIT DEVELOPMENT LAWN TO WETLAND Runoff = 0.44 cfs @ 12.09 hrs, Volume= 0.030 af, Depth= 0.83" Runoff by SCS TR -20 method, UH =SCS, Time Span= 0.00 -20.00 hrs, dt= 0.05 hrs Type III 24 -hr 2 YEAR STORM EVENT Rainfall = 100" Area (sf) CN Description 19,078 74 >75% Grass cover, Good, HSG C Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, w Subcatchment 2PS: PROPOSED 6 UNIT DEVELOPMENT LAWN TO WETLAND Hydrograph 0.45 0.4 0.35 0.3 w 3 0.25 0.2 0.15 0.1 0.05 0 0 1 2 3 4 5 6 7 8 9 1011121314151617181920 Time (hours) 3923 melnik 6 units Type 11124 -hr 2 YEAR NORM EVENT Rainfall = 3.00" Prepared by Heritage Surve nc. Page 6 HydroCADO 7.00 s/n 000860 © 6 -2003 Applied Microcomputer Systems 9/28/2005 Reach 1 PR: TOTAL POST CONSTRUCTION DISCHARGE Inflow Area = 0.750 ac, Inflow Depth = 0.48" for 2 YEAR STORM EVENT event Inflow = 0.44 cfs @ 12.09 hrs, Volume= 0.030 of Outflow = 0.44 cfs @ 12.09 hrs, Volume= 0.030 af, Atten= 0 %, Lag= 0.0 min Routing by Stor- Ind +Trans method, Time Span= 0.00 -20.00 hrs, dt= 0.05 hrs Reach 1 PR: TOTAL POST CONSTRUCTION DISCHARGE Hydrograph 1 1, N V 3 0 0 M ■ Inflow ■ Outflow 01 2 34567 8 9 101112 1314151617 181920 Time (hours) 3923 melnik 6 units Prepared by Heritage Su HydroCADO 7.00 s/n 000861 Type 11124 -hr 2 YEAR NORM EVENT Rainfall = 3.00" Page 7 Pond 1 PP: PROPOSED BASIN Inflow Area = 0.313 ac, Inflow Depth = 2.04" for 2 YEAR STORM EVENT event Inflow = 0.78 cfs @ 12.07 hrs, Volume= 0.053 of Outflow = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af, Atten= 100 %, Lag= 0.0 min Primary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of Routing by Stor -Ind method, Time Span= 0.00 -20.00 hrs, dt= 0.05 hrs Peak Elev= 403.30' @ 20.00 hrs Surf.Area= 2,148 sf Storage= 2,310 cf Plug -Flow detention time= (not calculated) Center -of -Mass det. time= (not calculated) # Invert Avail.Storage Storage Description 1 402.00' 3,915 cf Custom Stage Data (Prismatic) Listed below Elevation Surf.Area Inc.Store Cum.Store (feet) (sq -ft) (cubic -feet) (cubic -feet) a 402.00 1,315 0 0 403.00 1,957 1,636 1,636 404.00 2,601 2,279 3,915 # Routing Invert Outlet Devices 1 Primary 403.50' 6.0' long x 0.5' breadth Broad - Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 Coef. (English) 2.80 2.92 3.08 3.30 3.32 Primary OutFlow Max =0.00 cfs @ 0.00 hrs HW= 402.00' (Free Discharge) 't--1 =Broad-Crested Rectangular Weir ( Controls 0.00 cfs) Pond 1 PP: PROPOSED BASIN Hydrograph 0.8 Inflow Area =0.313 ac 0.7 Peak Elev= 403.30' 0.61 S torage =2,310 cf 0.61 0.5 c 0.4 U_ 0.3 W 0.78 cfs ■ Inflow ■ Primary 0.00 cfs o 0 1 2 3 4 5 6 7 8 9 10 111213141516 17181920 Time (hours) • 1ES EXISTING DRAINAGE AREA A � 1PS PROPO ED BASIN PROPOSED 6 UNIT DEVELOPMENT DRAINAGE TO BASIN w 1 PR 2PS L TOTAL POST CONSTRUCTION DISCHARGE on Link PROPOSED 6 UNIT DEVELOPMENT LAWN TO WETLAND Drainage Diagram for 3923 melnik 6 units Prepared by Heritage Surveys, Inc. 9/28/2005 HydroCAD® 7.00 s/n 000860 ® 1 9 8 6 -2003 Applied Microcomputer Systems 3923 melnik 6 units Type 11124 -hr 90 YEAR STORM EVENT Rainfall= 4.50" Prepared by Heritage Surveic. Page 2 HydroCADO 7.00 s/n 000860 © 6 -2003 Applied Microcomputer Systems 9/28/2005 Time span =0.00 -20.00 hrs, dt =0.05 hrs, 401 points Runoff by SCS TR -20 method, UH =SCS Reach routing by Stor- Ind +Trans method - Pond routing by Stor -Ind method Subcatchment 1 ES: EXISTING DRAINAGE AREA Runoff Area = 35,292 sf Runoff Depth= 1.53" Flow Length =170' Tc =11.7 min CN =70 Runoff =1.27 cfs 0.103 of Subcatchment 1 PS: PROPOSED 6 UNIT DEVELOPMENT DRA Runoff Area = 13,613 sf Runoff Depth= 3.41" Tc =5.0 min CN =92 Runoff =1.27 cfs 0.089 of Subcatchment 2PS: PROPOSED 6 UNIT DEVELOPMENT LAW Runoff Area = 19,078 sf Runoff Depth = 1.82" Tc =5.0 min CN =74 Runoff =1.01 cfs 0.067 of Reach 1 PR: TOTAL POST CONSTRUCTION DISCHARGE Inflow =1.01 cfs 0.091 of Outflow =1.01 cfs 0.091 of Pond 1 PP: PROPOSED BASIN Peak Elev= 403.53' Storage =2,843 cf Inflow =1.27 cfs 0.089 of Outflow =0.09 cfs 0.025 of Total Runoff Area =1.561 ac Runoff Volume = 0.259 of Average Runoff Depth =1.99" 3923 meinik 6 units Type 11124 -hr 10 YEW TORM EVENT Rainfall= 4.50" Prepared by Heritage Sury Inc. Page 3 HvdroCAD® 7.00 s/n 000860 86 -2003 Applied Microcomputer Systems _ 9/28/2005 Subcatchment 1 ES: EXISTING DRAINAGE AREA Runoff = 1.27 cfs @ 12.17 hrs, Volume= 0.103 af, Depth= 1.53" Runoff by SCS TR -20 method, UH =SCS, Time Span= 0.00 -20.00 hrs, dt= 0.05 hrs Type III 24 -hr 10 YEAR STORM EVENT Rainfall= 4.50" Area (sf) CN Description 35,292 70 Brush, Fair, HSG C Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 9.7 50 0.0400 0.1 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 3.00" 2.0 120 0.0417 1.0 Shallow Concentrated Flow, Woodland Kv= 5.0 fps 11.7 170 Total Subcatchment 1 ES: EXISTING DRAINAGE AREA Hydrograph ® Runoff 1 N V 3 0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 3923 meinik 6 units Type/// 24 -hr 10 YEA! TORM EVENT Rainfall= 4.50" Prepared by Heritage Surv086-2003 Inc. Page 4 HvdrnCADO 7.00 s/n 000860 Applied Microcomputer Sy stems 9/28/2005 Subcatchment 1PS: PROPOSED 6 UNIT DEVELOPMENT DRAINAGE TO BASIN Runoff = 1.27 cfs @ 12.07 hrs, Volume= 0.089 af, Depth= 3.41" Runoff by SCS TR -20 method, UH =SCS, Time Span= 0.00 -20.00 hrs, dt= 0.05 hrs Type III 24 -hr 10 YEAR STORM EVENT Rainfall= 4.50" Area (sf) CN Description 5,414 98 Building 5,017 98 Pavement 3,182 74 >75% Grass cover, Good, HSG C 13,613 92 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Subcatchment 1 PS: PROPOSED 6 UNIT DEVELOPMENT DRAINAGE TO BASIN Hydrograph 1.27 cfs I N 3 o Type III 24 -hr 10 YEAR STORM EVENT Rainfall= 4.50" Runoff Area= 13,613 sf Runoff Volume -0.069 of Runoff Depth =3A1" Tc =5.0 min CN =92 ® Runoff 0 8 9 1011121314151617181920 0 1 2 3 4 5 6 7 Time (hours) 3923 melnik 6 units Type 11124 -hr 10 YEAS TORM EVENT Rainfall = 4.50" Prepared by Heritage Sur` #, Inc. Page 5 HvdmCAD® 7.00 s/n 000860 986 -2003 Applied Microcomputer Systems 9/28/2005 Subcatchment 2PS: PROPOSED 6 UNIT DEVELOPMENT LAWN TO WETLAND Runoff = 1.01 cfs @ 12.08 hrs, Volume= 0.067 af, Depth= 1.82" ®- Runoff by SCS TR -20 method, UH =SCS, Time Span= 0.00 -20.00 hrs, dt= 0.05 hrs Type III 24 -hr 10 YEAR STORM EVENT Rainfall= 4.50" Area (sf) CN Description 19,078 74 >75% Grass cover, Good, HSG C Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct En", Subcatchment 2PS: PROPOSED 6 UNIT DEVELOPMENT LAWN TO WETLAND Hydrograph ® Runoff 1 H V 3 0 0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 3923 melnik 6 units Type 11124 -hr 10 YEAI TORM EVENT Rainfall= 4.50" ® Prepared by Heritage Survo Inc. Page 6 HvdroCAD ®7 00 sin 000860 86 -2003 Applied Microcomputer Systems 9/28/2005 Reach 1 PR: TOTAL POST CONSTRUCTION DISCHARGE Inflow Area = 0.750 ac, Inflow Depth = 1.46" for 10 YEAR STORM EVENT event Inflow = 1.01 cfs @ 12.08 hrs, Volume= 0.091 of Outflow = 1.01 cfs @ 12.08 hrs, Volume= 0.091 af, Atten= 0 %, Lag= 0.0 min Routing by Stor- Ind +Trans method, Time Span= 0.00 -20.00 hrs, dt= 0.05 hrs Reach 1 PR: TOTAL POST CONSTRUCTION DISCHARGE Hydrograph ■ Inflow ■ Outflow 1 N V 3 O LL 0 1 2 3 4 5 6 7 8 9 1011121314151617181920 Time (hours) 3923 melnik 6 units Prepared by Heritage Sury Inc. HvdroCAD® 7.00 s/n 000860 Type/// 24 -hr 10 YEAf TORM EVENT Rainfall Page 7 Pond 1PP: PROPOSED BASIN Inflow Area = 0.313 ac, Inflow Depth = 3.41" for 10 YEAR STORM EVENT event Inflow = 1.27 cfs @ 12.07 hrs, Volume= 0.089 of Outflow = 0.09 cfs @ 13.39 hrs, Volume= 0.025 af, Atten= 93 %, Lag= 78.8 min Primary = 0.09 cfs @ 13.39 hrs, Volume= 0.025 of Routing by Stor -Ind method, Time Span= 0.00 -20.00 hrs, dt= 0.05 hrs Peak Elev= 403.53' @ 13.39 hrs Surf.Area= 2,298 sf Storage= 2,843 cf Plug -Flow detention time= 305.4 min calculated for 0.025 of (28% of inflow) Center -of -Mass det. time= 175.0 min ( 930.6 - 755.5 ) # Invert Avail.Storage Storage Description 1 402.00' 3,915 cf Custom Stage Data (Prismatic) Listed below Elevation Surf.Area Inc.Store Cum.Store (feet) (sq -ft) (cubic -feet) (cubic -feet) - 402.00 1,315 0 0 403.00 1,957 1,636 1,636 404.00 2,601 2,279 3,915 # Routing Invert Outlet Devices 1 Primary 403.50' 6.0' long x 0.5' breadth Broad - Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 Coef. (English) 2.80 2.92 3.08 3.30 3.32 Primary OutFlow Max =0.09 cfs @ 13.39 hrs HW= 403.53' (Free Discharge) t-1= Broad - Crested Rectangular Weir (Weir Controls 0.09 cfs @ 0.5 fps) Pond 1 PP: PROPOSED BASIN Hydrograph ■ Inflow ■ Primary 1 N V 3 0 PC 01 2 345 6 7891011121314151617181920 Time (hours) • 1 E EXISTING DRAINAGE AREA PROPO ED BASIN PROPOSED 6 UNIT DEVELOPMENT DRAINAGE TO BASIN �r y 1PRq �2PS TOTAL POST CONSTRUCTION DISCHARGE PROPOSED 6 UNIT DEVELOPMENT LAWN TO WETLAND � Subcet / ' teach on Link Drainage Diagram for 3923 melnik 6 units Prepared by Heritage Surveys, Inc. 9/28/2005 HydroCADS 7.00 s/n 000860 ©19 -2003 Applied Microco mputer Systems 3923 meinik 6 units Prepared by Heritage Surv 086-2( Inc. HvdmCAD® 7.00 s/n 000860 Type/// 24 -hr 100 YEAf rORM EVENT Rainfall= 6.50" Page 2 Time span =0.00 -20.00 hrs, dt =0.05 hrs, 401 points Runoff by SCS TR -20 method, UH =SCS Reach routing by Stor- Ind +Trans method - Pond routing by Stor -Ind method Subcatchment 1ES• EXISTING DRAINAGE AREA Runoff Area = 35,292 sf Runoff Depth= 2.97" Flow Length =170' Tc =11.7 min CN =70 Runoff =2.50 cfs 0.201 of Subcatchment 1PS: PROPOSED 6 UNIT DEVELOPMENT DRA Runoff Area = 13,613 sf Runoff Depth = 5.28" Tc =5.0 min CN =92 Runoff =1.91 cfs 0.138 of Subcatchment 2PS: PROPOSED 6 UNIT DEVELOPMENT LAW Runoff Area = 19,078 sf Runoff Depth= 3.37" Tc =5.0 min CN =74 Runoff =1.85 cfs 0.123 of Reach 1PR: TOTAL POST CONSTRUCTION DISCHARGE Inflow =2.13 cfs 0.196 of Outflow =2.13 cfs 0.196 of Pond 1PP: PROPOSED BASIN Peak Elev= 403.65' Storage =3,121 cf Inflow =1.91 cfs 0.138 of Outflow =0.99 cfs 0.073 of Total Runoff Area= 1.561 ac Runoff Volume= 0.461 of Average Runoff Depth = 3.54" 3923 meinik 6 units Prepared by Heritage Sury Inc. HvdrnCAD® 7.00 s/n 000860 86 -2( Type 11124 -hr 100 YEAf TORM EVENT Rainfall = 6.50" Page 3 Subcatchment 1ES: EXISTING DRAINAGE AREA Runoff = 2.50 cfs @ 12.17 hrs, Volume= 0.201 af, Depth= 2.97' Runoff by SCS TR -20 method, UH =SCS, Time Span= 0.00 -20.00 hrs, dt= 0.05 hrs Type III 24 -hr 100 YEAR STORM EVENT Rainfall= 6.50" Area (sf) CN Description 35,292 70 Brush, Fair, HSG C Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 9.7 50 0.0400 0.1 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 3.00" 2.0 120 0.0417 1.0 Shallow Concentrated Flow, Woodland Kv= 5.0 fps 11.7 170 Total Subcatchment 1 ES: EXISTING DRAINAGE AREA Hydrograph ■ Runoff 2 N V 3 _o U 1 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 3923 melnik 6 units Type/// 24 -hr 900 YEA[ TORM EVENT Rainfall= 6.50" z - Prepared by Heritage Sury Inc. Page 4 086-2003 HydroCADO 7.00 s/n 000860 Applied Microco Systems 9/28/2005 Subcatchment 9 PS: PROPOSED 6 UNIT DEVELOPMENT DRAINAGE TO BASIN Runoff = 1.91 cfs @ 12.07 hrs, Volume= 0.138 af, Depth= 5.28" — Runoff by SCS TR -20 method, UH =SCS, Time Span= 0.00 -20.00 hrs, dt= 0.05 hrs Type III 24 -hr 100 YEAR STORM EVENT Rainfall= 6.50" Area (sf) CN Description 5,414 98 Building 5,017 98 Pavement 3,182 74 >75% Grass cover, Good, HSG C 13,613 92 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Subcatchment 1 PS: PROPOSED 6 UNIT DEVELOPMENT DRAINAGE TO BASIN Hydrograph 2 H V 0 1 M ■ Runoff 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 3923 melnik 6 units Type M24-hr 100 YEAF ORM EVENT Rainfall=6.50" Prepared by Heritage Sunt Inc. Page 5 HydroCADO 7.00 s/n 000860 *86-2003 Applied Microcomputer Systems 9/28/2005 Subcatchment 2PS: PROPOSED 6 UNIT DEVELOPMENT LAWN TO WETLAND Runoff = 1.85 cfs @ 12.08 hrs, Volume= 0.123af, Depth= 3.37" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 100 YEAR STORM EVENT Rainfall=6.50' Area (sf) CN Description 19,078 74 >75% Grass cover, Good, HSG C Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Subcatchment 2PS: PROPOSED 6 UNIT DEVELOPMENT LAWN TO WETLAND Hydrograph 04 0 0 0 1 2 3 4 5 6 7 8 9 1011121314151617181920 Time (hours) 10 Runoffj 3yz;s melnik 6 units Type M24-hr 900 YEAF ORM EVENT Rainfall = 6.50" Prepared by Heritage Sury Inc. Page 6 HydroCADO 7.00 s/n 000860 6 -2003 Applied Microcomputer Systems 9/28/2005 Reach 1 PR: TOTAL POST CONSTRUCTION DISCHARGE Inflow Area = 0.750 ac, Inflow Depth = 3.14" for 100 YEAR STORM EVENT event Inflow = 2.13 cfs @ 12.15 hrs, Volume= 0.196 of Outflow = 2.13 cfs @ 12.15 hrs, Volume= 0.196 af, Atten= 0 %, Lag= 0.0 min Routing by Stor- Ind +Trans method, Time Span= 0.00 -20.00 hrs, dt= 0.05 hrs Reach 1 PR: TOTAL POST CONSTRUCTION DISCHARGE Hydrograph ■ Inflow ■ Outflow v 3 U . 0 1 2 3 4 5 6 7 8 9 1011 1213 1415 1617 1819 20 Time (hours) 3923 melnik 6 units Prepared by Heritage Sury Inc. *86 HvdroCAD® 7.00 s/n 000860 Type 11124-hr 900 YEAF ORM EVENT Rainfall Page 7 Pond 1 PP: PROPOSED BASIN Inflow Area = 0.313 ac, Inflow Depth = 5.28" for 100 YEAR STORM EVENT event Inflow = 1.91 cfs @ 12.07 hrs, Volume= 0.138 of Outflow = 0.99 cfs @ 12.22 hrs, Volume= 0.073 af, Atten= 48 %, Lag= 8.7 min Primary = 0.99 cfs @ 12.22 hrs, Volume= 0.073 of Routing by Stor -Ind method, Time Span= 0.00 -20.00 hrs, dt= 0.05 hrs Peak Elev= 403.65'@ 12.22 hrs Surf.Area= 2,377 sf Storage= 3,121 cf Plug -Flow detention time= 178.2 min calculated for 0.073 of (53% of inflow) Center -of -Mass det. time= 91.9 min ( 837.2 - 745.3 ) # Invert Avail Storage Storage Description 1 402.00' 3,915 cf Custom Stage Data (Prismatic) Listed below Elevation Surf.Area Inc.Store Cum.Store (feet) (sq -ft) (cubic -feet) (cubic -feet) - 402.00 1,315 0 0 403.00 1,957 1,636 1,636 404.00 2,601 2,279 3,915 # Routing Invert Outlet Devices 1 Primary 403.50' 6.0' long x 0.5' breadth Broad - Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 Coef. (English) 2.80 2.92 3.08 3.30 3.32 Primary OutFlow Max =0.96 cfs @ 12.22 hrs HW= 403.65' (Free Discharge) L1 = Broad- Crested Rectangular Weir (Weir Controls 0.96 cfs @ 1.1 fps) Pond 1 PP: PROPOSED BASIN Hydr ograph 1.91 cfs 2 Inflow Area =0.313 ac Peak Elev= 403.65' Storage =3,121 cf v 0.99 cfs 0 1 LL ■ Inflow ■ Primary 0 01 2 345 6 7891011121314151617181920 Time (hours)