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GOLOTOV SUB LT 1 - ZCP 8/24/2018Print Form Submit by Email Kodiak Island Borough - -- - - b. Community Development Department III IIIIIIIIIIIIIIIIIII 710 Mill Bay Rd. Rm 205 II Kodiak AK 99615 Ph. (907) 486 - 9363 Fax (907) 486 - 9396 24536 http://www.kodiakak.us Zoning Compliance Permit Permit No. BZ2019-014 The following information is to be supplied by the Applicant: Property Owner/ Applicant: SWELL, LLC/ SR Bales Construction Mailing Address: 1113 W FIREWEED LANE #202, Anchorage, AK 99503 Phone Number: Swell LLC: Glenn Gellert (907) 748-6157 Other Contact email, etc.: SR Bales Construction dylan@srbcak.com 907-727-3947 Legal Description: Subdv: Golotov Subdivision Block: Lot: 1 Street Address: 529 Carol Way Use & Size of Existing Structures: Undeveloped Land Description of Proposed Action: Build 30 unit multifamily complex Site Plan to include: Lot boundaries and existing easements, existing buildings, proposed location of new construction, access points, and vehicular parking areas. Staff Compliance Review: Lot Area: 67,889 SF Front Yard: 25 ' Current Zoning: R3 Lot Width: 145' Rear Yard: 10' KIBC 17.85 PROP—ID 24536 Bld'g Height: 35 ' Side Yard: 5 ' Prk'g Plan Rvw? Yes # of Req'd Spaces: 45 Staff Compliance Review Notes: Plat / Subdivision Requirements? 30 units requiring 1.5 spaces per unit = 45 spaces. Spaces in garages are permitted per similar use determination in case 17-031. KIB E/F has approved the drainage plan for the site. Subd Case No. S18-013 Plat No. 2018-8 Bld'g Permit No. TBD Bldg Dept Does the project involve YES an EPA defined facility? *Commercial buildings, installations (military bases), institutions (schools, hospitals) and residences with more than four (4) dwelling units. Driveway Permit? Septic Plan Approval: Fire Marshall: TBD KIB E/F N/A TBD Bldg Dept Proof of EPA notification provided (if required)? NO *Required for all demolitions, for renovations disturbing at least 160 square feet 260 linear feet or 35 cubic feet of Regulated Asbestos Containing Material (RACM), and for renovations that remove a load -supporting structural member. No permit will be issued for such projects without proof of EPA notification Applicant Certification: 1 hereby certify that) will comply with the provisions of the Kodiak Island Borough Code and that I have the authority to certify this as the property owner, or as a representative of the property owner. 1 agree to have identifiable corner markers in place for verification of building setback (yard) requirements. Attachments? Site Plan List Other: Digitally signed by Glenn Gellert Date: Aug 21, 2018 Signature: Glenn G e I I e r# DN: cn=Glenn Gellert, o, ou, gmail=alenn.aellertn-amail .com. c=US Date: 2018.08.21 17:35:16 -08'00' This permit is only for the proposed project as described by the applicant. If there are any changes to the proposed project, including its intended use, prior to or during its siting, construction, or operation, contact this office immediately to determine if further review and approval of the revised project is necessary. THIS FORM DOES NOTA UTHORIZE CONSTRUCTION WHEN A BUILDING PERMIT IS REQUIRED. "EXPIRATION.- Any zoning compliance permit issued is subject to the same expiration, suspension, and revocation provisions as a building permit issued for the same construction permit.** CDD Staff Certification Date: Aug 21, 2018 CDD Staff: Payment Verification Zoning Compliance Permit Fee Payable in Cashier's Office Room # 104 - Main floor of Borough Building After -the -Fact 2X the published amount Not Applicable $0.00 $0.00 Less than 1.75 acres: $30.0 $60.00 1.76 to 5.00 acres: $60.00 ` El $120.00 5.01 to 40.00 acres: $90.00 [—] $180.00 ((d 61 40.01 acres or more: E] $120.00 E] $240.00 -PAID' 0 AUS 24 2016 K0B1AK1.SW1uudU"UUGh LttltnniPer;^incntT PAYMENT DATE 08/24/2018 COLLECTION STATION CASHIER RECEIVED FROM SWELL, LLC/ SR BALES CONSTRUCTION DESCRIPTION 529 CAROL WAY Kodiak Island Borough 710 Mill Bay Rd. Kodiak, AK 99615 Zoning Compl Zoning Compliance Permit BZ 2019 014 Payments: Type Detail Amount Check 166 $30.00 Total Amount: Customer Copy BATCH NO. 2019-00000084 RECEIPT NO. 2019-00000233 CASHIER Teresa Medina $30.00 $30.00 Printed hv: Tereca Medina Pane 1 of 1 OR/241201R 03.13:09 PM Spruce Cape Garage Parking Policy 1.) All motor vehicles parked on the premises must be in running condition capable of operating legally on the street, properly licensed and insured. All vehicles must be parked in designated spaces. Illegally parked vehicles, non -motorized vehicles, and any other vehicle not complying with these standards will be subject to being towed at the Resident's expense. Unless the Resident obtains prior written permission from the Property Manager, any vehicle that has not been moved within any 14 day period will be considered abandoned and will be subject to being towed at the resident's expense. Speed limit in the parking lot is 5 miles per hour. 2.) All Resident vehicles must be registered with the Property Manager. Car registration information must be included on the lease agreement, which can be amended as needed. The registration information must include the make, model, color and license number of each Resident's vehicle. 3.) Residents with one car must park the car in the Resident's assigned garage. This requirement does not pertain to the Resident occupying the designated ADA unit. This unit does not have a garage. 4.) Residents with 2 cars must park one car in the Resident's assigned garage and the second car in front of the Resident's garage. 5.) Personal items may be stored in garages but must not inhibit car parking in the garage. 6.) Guest vehicles must be parked in areas designated by management. Permanent residents are not permitted to use guest parking. 7.) After one warning regarding misuse of designated parking spaces, the Property Manager will fine the offending Resident $50. A second offense constitutes a $150 fine. After the third infraction, the Property Manager reserves the right to evict Residents who continually violate the parking rules. AML A *-AIATM Document A1 01 -2017 Standard Form of Agreement Between Owner and Contractor where the basis of payment is a Stipulated Sum AGREEMENT made as of the 15th day of May in the year 2018 (In words, indicate day, month and year.) This document has important BETWEEN the Owner: legal consequences. (Name, legal status, address and other information) Consultation with an attorney is Spruce Cape Homes, LLC encouraged with respect to its completion or modification. 1113 Fireweed Lane, Suite 202 Anchorage, AK 99503 The parties should complete Al 01 Tm-2017, Exhibit A, Insurance and Bonds, contemporaneously with this and the Contractor: Agreement. ('Vame, legal status, address and other information) AIA Document A201 T^'-2017, SR Bales Construction, Inc. General Conditions of the 1200 East 76th Avenue Suite 1223 Contract for Construction, is Anchorage, AK 99518 adopted in this document by reference. Do not use with other general conditions unless this document is modified. for the following Project: (lame, location and detailed description) Spruce Cape Townhomes Kodiak, Alaska The Architect: (Name, legal status, address and other information) Carel Nagata PO Box 100263 Anchorage, AK 99503 The Owner and Contractor agree as follows. Init. AIA Document A101 TO —2017. Copyright ® 1915. 1918,1925,1937, 1951. 1958, 1961, 1963,1967' 1974. 1977,1987, 1991, 1997, 2007 and 2017 by The American Institute of Architects. All rights reserved. WARNING: This AIA! Document Is protected y U.S. Copyright Law and international Treaties. Unauthorized reproduction or distribution of this AIA! Document, or any portion of It, may result in severe civil and criminal penalties, and will be l prosecuted to the maximum extent possible under the law. This document was created on 05/09/2018 16:2209 under the terms of AIA Documents on Demand! Order No. 2009924393 , and is not for resale. This documents licensed by The American Institute of Architects for one-time use only, and may not be reproduced prior to its completion. Supplementary and other Conditions of the Contract: Document Me Date Pages Other documents, if any, listed below: (List here any additional documents that are intended to form part of the Contract Documents. AM Document A10ITM-2017provides that the advertisement or invitation to bio:4 Instructions to Bidders, sample forms, the Contractor's bid or proposal, portions ofAddenda relating to bidding or proposal requirements, and other information furnished by the Owner in anticipation of receiving bids or proposals, are not part of the Contract Documents unless enumerated in this Agreement. Any such documents should be listed here only if intended to be part of the Contract Documents.) This Agreement entered into as ofth day and year first written above. //�p OWN (Signature) COMWIACTOR (Signature) Glenn Gellert Dylan Bales, Vice President (Printed name and title) (Printed name and title) AIA DocumentA101TM — 2017. Copyright O ISIS, 1918, 1925,1937,1951,1958,1961,1963,1967,1974,1977,1987,1991, 1997, 2007 and 2017 by The Init. American lnbb1hft ol`Amhitects. All rights reserved. WARNING: This AIA! Document is protected by U.S. Copyright Law and Marnational Traatiea. Unauttroriiced reproduction or distribution of this AIA! Doet mant, or any portion of It, may result in severe oMl and ariminsi penalties, and will be 10 / prosecuted to tta rnaudmum extent possible under the law. This document was created on 05!09/201816:22:09 under the tern of AIA Documents on Demand! order No. 2009924393 , and is not for resale. This document Is licensed by The American Institute of Architects for wo-time use only, and may not be reproduced prior to its completion. Spruce Cape Garage Parking Policy 1.) All motor vehicles parked on the premises must be in running condition capable of operating legally on the street, properly licensed and insured. All vehicles must be parked in designated spaces. Illegally parked vehicles, non -motorized vehicles, and any other vehicle not complying with these standards will be subject to being towed at the Resident's expense. Unless the Resident obtains prior written permission from the Property Manager, any vehicle that has not been moved within any 14 day period will be considered abandoned and will be subject to being towed at the resident's expense. Speed limit in the parking lot is 5 miles per hour. 2.) All Resident vehicles must be registered with the Property Manager. Car registration information must be included on the lease agreement, which can be amended as needed. The registration information must include the make, model, color and license number of each Resident's vehicle. 3.) Residents with one car must park the car in the Resident's assigned garage. This requirement does not pertain to the Resident occupying the designated ADA unit. This unit does not have a garage. 4.) Residents with 2 cars must park one car in the Resident's assigned garage and the second car in front of the Resident's garage. 5.) Personal items may be stored in garages but must not inhibit car parking in the garage. 6.) Guest vehicles must be parked in areas designated by management. Permanent residents are not permitted to use guest parking. 7.) After one warning regarding misuse of designated parking spaces, the Property Manager will fine the offending Resident $50. A second offense constitutes a $150 fine. After the third infraction, the Property Manager reserves the right to evict Residents who continually violate the parking rules. July 25, 2018 Kodiak Island Borough Community Development Department 710 Mill Bay Road Kodiak, Alaska 99615 Phone (907) 486-9363 Fax (907) 486-9396 www.kodiak.ak.us Swell, LLC Mr. Glenn Gellert 1113 West Fireweed Lane, Suite 202 Anchorage, AK 99503 Re: Case 18-018. Request a Site Plan Review, per KIBC 17.130.020, to review the design of a proposed multi -family residential development consisting of 30 townhouse style dwelling units on Lot 1, Block 3, Kadiak Subdivision, First Addition (3382 Sharatin Road). Dear Mr. Gellert: The Kodiak Island Borough Planning and Zoning Commission at their regular meeting on July 18, 2018, granted approval on the case referenced above subject to the following conditions of approval. CONDITIONS OF APPROVAL 1. An engineered drainage plan, approved by the Kodiak Island Borough Engineering and Facilities Department Director, shall be provided prior to issuance of zoning compliance for the proposed development 2. All improvements required by the approved engineered drainage plan shall be completed prior to issuance of a certificate of occupancy for any structure associated with the proposed development. The Planning & Zoning Commission adopted these "Findings of Fact' in support of their decision. FINDINGS OF FACT 1. Multifamily residential buildings are listed as a permitted use in the R3 -Multifamily Residential district. 2. The conditions of approval will ensure that the site plan for this case meets all standards as required by Kodiak Island Borough code. 3. Approving this site plan will further implement certain Land Use & Ownership and Housing goals, policies, and implementation actions of the 2008 Comprehensive Pian. If you have any questions regarding the Commission's actions, please contact the Community Development Department at 496-9363. Sincerely, Ql� Q101 Q60 Sheila Smith, Secretary Community Development Department CC: Nova Javier, Borough Clerk Planning and Zoning Commission July 25, 2018 Kodiak Island Borough Community Development Department 710 Mill Bay Road Kodiak, Alaska 99615 Phone (907) 486-9363 Fax (907) 486-9396 w,,vw.kodiak.ak.us Swell, LLC Mr. Glenn Gellert 1113 West Fireweed Lane, Suite 202 Anchorage, AK 99503 Re: Case 18-018. Request a Site Plan Review, per KIBC 17.130.020, to review the design of a proposed multi -family residential development consisting of 30 townhouse style dwelling units on Lot 1, Block 3, Kadiak Subdivision, First Addition (3382 Sharatin Road). Dear Mr. Gellert: The Kodiak Island Borough Planning and Zoning Commission at their regular meeting on July 18, 2018, granted approval on the case referenced above subject to the following conditions of approval. CONDITIONS OF APPROVAL 1. An engineered drainage plan, approved by the Kodiak Island Borough Engineering and Facilities Department Director, shall be provided prior to issuance of zoning compliance for the proposed development 2. All improvements required by the approved engineered drainage plan shall be completed prior to issuance of a certificate of occupancy for any structure associated with the proposed development. The Planning & Zoning Commission adopted these "Findings of Fact" in support of their decision. FINDINGS OF FACT 1. Multifamily residential buildings are listed as a permitted use in the R3 -Multifamily Residential district. 2. The conditions of approval will ensure that the site plan for this case meets all standards as required by Kodiak Island Borough code. 3. Approving this site plan will further implement certain Land Use & Ownership and Housing goals, policies, and implementation actions of the 2008 Comprehensive Plan. If you have any questions regarding the Commission's actions, please contact the Community Development Department at 496-9363. Sincerely, Sheila Smith, Secretary Community Development Department CC: Nova Javier, Borough Clerk Planning and Zoning Commission June 28, 2017 Swell LLC 1113 Fireweed Lane #202 Anchorage, AK 99503 Mr. Trevor Edmondson The Petersen Group, Inc. 3820 Lake Otis Parkway Anchorage, AK 99508 Kodiak Island Borough Community Development Department 710 Mill Bay Road Kodiak, Alaska 99615 Phone (907) 486-9363 Fax (907) 486-9396 www.kodiakak.us Re: Case 17-031. Request a Similar Use Determination that the use of tandem parking spaces and spaces within attached garages to meet the off-street parking requirements for multi -family dwellings is similar to allowing the use of such spaces to meet the off-street parking requirements for one and two-family dwellings (KIBC 17.175.070.H and 17.15.090.A). Dear Mr. Edmondson: The Planning & Zoning Commission, at their regular meeting on June 21, 2017, determined that the request referenced above was similar in use to and granted approval subject to one Condition of Approval. CONDITION OF APPROVAL 1. The rental agreement for this multi -family residential development shall include language that required tenants to utilize the off-street parking spaces within their respective dwelling unit's garage for the parking of operable licensed and registered passenger vehicles. A copy of the rental agreement shall be provided to the Community Development Department prior to issuance of zoning compliance. The commission also adopted the following findings of fact in support of their decision: FINDINGS OF FACT 1. Lot size constraints require that this multi -family housing development use tandem parking spaces and spaces within garages to provide the required number of off- street parking spaces and to meet the maneuvering area requirements of KIBC 17.175.080.G and fire apparatus access and turnaround requirements of the adopted fire code. 2. The intended purpose of tandem off-street parking spaces and spaces within garages for multi -family dwellings is identical to the intended purpose of such spaces for one- and two-family dwellings.' 3. The KIBC 17.175.080.G requirement for multi -family dwellings to provide onsite parking maneuvering areas eliminates the potential for local traffic disruptions that can be associated with the use of tandem spaces for one- and two-family dwellings. Accordingly, tandem parking spaces are better suited for multi -family dwelling use than for one- and two-family dwelling use. 4. The condition of approval, combined with a lack of available on -street parking near the site, will greatly reduce the potential for the off-street parking spaces within the garages to be used for any purpose other than the parking. 5. Off-street parking spaces within the garages of one and two-family dwellings are commonly used for purposes other than parking. The condition of approval greatly reduces this potential by requiring such spaces to be used exclusively for parking. Accordingly, such spaces are better suited to meet the off-street parking requirements for these multi -family dwellings than for one and two-family dwellings. An appeal of this decision may be initiated by; 1) the applicant, or 2) any person who was sent a written notice or submitted timely written comments, by filing a written notice of appeal to the Borough Clerk within ten (10) working days of the date of this decision. The notice of appeal must state the specific grounds for the appeal and the relief sought by the appellant, and accompanied by the $350 appeal fee. Therefore, the decision will not be final and effective until ten (10) working days following the decision. For more information on the appeal process please contact the Borough Clerk's Office at 486- 9310. Should have any questions regarding the determination please feel free to contact me at 486-9363 if you. Sincerely, Sheila Smith, Secretary Community Development Department CC: Nova Javier, Borough Clerk Planning & Zoning Commission From: Jack Maker To: Glenn Gellert (glenn.gellert(Marnail.coml Cc: Daniel Mckenna-Foster Subject: FW: Spruce Cape Townhomes Case 18-018 - Drainage Impact Analysis: APPROVED Date: Wednesday, August 15, 2018 11:40:45 AM Attachments: Spruce Cape Townhomes DIA 8 3.18.odf Spruce Site ARproval.pdf imaae002.pna imaae003,ona Importance: High Good morning Glenn, Per the below email, our Engineering and Facilities Department Director has approved the drainage plan for you project. A copy of the approval has been placed in the property file. Please feel free to contact me with any questions or concerns. Thank you, Jack L. Maker Associate Planner, Acting Director Community Development Dept. 710 Mill Bay Road Kodiak, AK 99615 (907) 486-9362 (907) 539-1475 (cell) (907) 486-9396 (fax) imaker(@kodiakak.us htto://www.kadiakak.us From: Phil Kovacs Sent: Tuesday, August 14, 2018 8:21 PM To: Jack Maker <jmaker@kodiakak.us> Cc: Martha Barnett <mbarnett@kodiakak.us>; Dave Conrad <dconrad@kodiakak.us> Subject: Spruce Cape Townhomes Case 18-018 - Drainage Impact Analysis: APPROVED Importance: High Jack, The Kodiak Island Borough (KIB) Engineering and Facilities Department approves the Spruce Cape Townhomes Drainage Impact Analysis prepared by Triad Engineering, LLC for Swell, LLC. Regards, Phillip Kovacs, PE, MEng, MSc, CESCL Director of Engineering/ Facilities Kodiak Island Borough 710 Mill Bay Road, Room 225 Kodiak, AK 99615 Office: (907) 486-9357 Cell: (503) 409-3346 bkovacs akodiakak.us From: Jack Maker Sent: Monday, August 6, 2018 8:15 AM To: Phil Kovacs <pkovacsl@kodiakak.us> Subject: FW: Spruce Cape Townhomes Case 18-018 - Drainage Impact Analysis Importance: High Hi Phil, Attached is the drainage plan for spruce cape townhomes at 3382 Sharatin Road. One of the conditions of approval for both the site plan review and the subdivision is that an engineered drainage plan be submitted and approved by you. Accordingly, I would appreciate it if you could review it and let me know if you approve (an email will suffice). Please feel free to give me a shout if you have any questions or concerns. Thanks! Jack From: Brandon Marcott <brandonmarcottPtriadak.com> Sent: Friday, August 3, 2018 2:26 PM To: Jack Maker <imaker(@kodiakak.us> Cc: Hansen, Ted <thansen(@city.kodiak.ak.us>; Carel Nagata <carelnagata(@gmail.com>; Clark Yerrington <cyerrington(@frame-ak.com>; Glenn Gellert <glenn.gellert(@gmail.com>; John McGrew <iohn.j.mcgrew(@gmail.com>; Dave Grenier <davegrenier(@triadak.com> Subject: Spruce Cape Townhomes Case 18-018 - Drainage Impact Analysis Good afternoon Jack, Per the conditions of approval for Case 18-018 (Spruce Cape Townhomes) please find the attached drainage impact analysis for the proposed improvements within the development. Please note that this is a site specific analysis as discussed during the Planning and Zoning Commission hearing. The analysis indicates that the proposed storm drain infrastructure, as shown in the submitted civil plans, is more than adequate to convey the 25 year, 24 hour storm event. No additional changes or revisions are proposed to the civil plans that have been submitted for your review. Please review and let me know if there are any questions regarding the attached. Thanks and have a great weekend. Brandon ENGINEERING, LLC Brandon Marcott, P.E. / Principal Engineer Office: 907.344.3114 / Mobile: 907.227.0905 / brandonmarcottptriadak.com Physical: 1300 E. 68th Ave., Suite 210, Anchorage, AK 99518 Mailing: P.O. Box 111989, Anchorage, AK 99511 Website: www.triadak.com Site Planning / Civil Engineering Design / Project Management Spruce Cape Townhomes Drainage Impact Analysis Owner/Developer: Swell, LLC 113 Fireweed Lane, Suite 202 Anchorage, AK 99503 Prepared By: 4.11 am Box 111989 Anchorage, Alaska 99511 (907) 561-6537 v••a. •u �E OFA... 49 it! �. BRANDON J.MARCOTT ;0' CE 12601�� f ��i�iF�PROFESS10l1P`����,= August 2018 Table of Contents 1. Project Description a. Location b. Project Description c. Category Determination 2. Basin Characterization a. Pre -development conditions b. Post -development conditions c. Contributing off-site drainage d. Floodways, floodplains, and wetlands e. Pre -development runoff analysis 1) Watershed area 2) Time of concentration 3) Precipitation model 4) Rainfall loss method 5) Runoff model 6) Summary of pre -development runoff f. Post -development Runoff Analysis 1) Watershed area 2) Time of concentration 3) Precipitation model 4) Rainfall loss method 5) Runoff model 6) Summary of post -development runoff 3. Stormwater Conveyance Design a. Storm sewer b. Culverts c. Open channel flow d. Hydraulic model e. Operations and Maintenance 4. References 5. Appendix 1 1 2 2 3 3 4 4 5 5 5 5 5 5 5 6 6 6 6 6 7 7 7 7 7 8 8 9 9 9 10 1. Project Description a. Location The Spruce Cape Townhomes development is located at the southeast corner of Sharatin Road and Carroll Way in Kodiak Alaska. The parcel is currently a 2.47 acre site of undeveloped land that is two hundred thirty feet by four hundred seventy feet (230 x 470) and slopes downward from Sharatin Road towards Spruce Cape Road and the water. The lot drops approximately twenty-eight (28) feet vertically across a horizontal distance of two hundred thirty (230) feet which is twelve (12) percent slope. The property is zoned R3 and has the potential to fit fifty (50) units when fully developed. This phase of development proposes to construct thirty (30) townhouse style rental units. The legal description is Lot 1, Block 3, First Addition, Kadiak Subdivision. See Figure 1 and 2 for the project location. Fort Abercrombie se asteu. State Historic Park 3382 Sharatin Road Kodiak Parks & Recreation Department 9 Kodiak Near Island Alekseshkina Figure 1: Project Location 1 1�` On the Cape Vacation Rentak; T Pr `ect Locion �m �.p 4a dy G �a Figure 2: Street Location b. Project Description Phase 1 of the Spruce Cape Townhomes project intends to develop 1.55 acres of the existing 2.47 acre parcel by preparing the site for construction of 30 townhouse style dwelling units along with a central shared access driveway that is twenty-four feet wide and enters from Carroll Way. The shared driveway will be paved including sidewalks and parking areas. The driveway also contains a fire truck turning area as well as storm drain, water and sewer mains and associated services. Both Sheratin Road and Carroll way are publicly dedicated roads maintained by Road Service Area No 1. c. Category Determination The project scope includes the construction of an internal storm sewer collection system which will direct concentrated runoff from this development into the existing road side ditch along Carroll Way. Carroll Way then connects into the drainage ditch along Spruce Cape Road (a secondary highway). Per Appendix A of Chapter 7 of the Alaska Highway Drainage Manual, the 25 year, 24 hour storm was selected as the design storm for "Channel Changes along less important Secondary Highways." 2 2. Basin Characterization a. Pre -development conditions Currently the site is undeveloped and well -vegetated with mature trees, underbrush and sloping topography. The only storm drain facilities in the immediate area are the grassed drainage ditches along Sharatin Road and Carroll Way. A soils investigation of the site, completed in August of 2017 by Northern Geotechnical Engineering, indicates 1 foot of volcanic ash underlain by 1-2.5 feet of silty sand with organics. The silty sand is underlain by a thin layer of poorly graded gravel above shallow bedrock ranging from 2.0 to 5.5 feet below the ground surface. The existing drainage pattern for the lot is in a south-easterly direction with approximately 30 feet of vertical relief across the project site. A land use description of "Woods" in "Good Condition" was used for the parcel. An existing 24" culvert directs runoff from the westerly ditch of Carroll Way, across the road, and outfalls generally near the proposed access to the site. The lack of an established ditch on the easterly side of Carroll Way allows the concentrated runoff to be directed into the subject property. This runoff combines with the internal pre - development runoff and generally flows east and south into the neighboring properties. See Figure 3 below for the existing condition of the property. See the Appendix VI map for a boundary and topographic survey of the current site conditions and drainage patterns. Figure 3: Predevelopment Condition 3 b. Post -development conditions After the construction of the buildings, private street, sidewalks and associated parking areas, post -development conditions will result in an increase of impervious area of approximately 1.13 acres for Phase 1, a 73% increase. The private street is designed with grades less than 4%. A 15" storm drain system is proposed within the private road to collect surface runoff as well as roof and footing drain runoff. Multiple top inlet manholes are provided within the private street such that any singular manhole will not be accepting more than 25% of the surface runoff. Once collected, storm runoff is directed towards the easterly road side ditch along Carroll Way. Note that the proposed grading plan re-establishes the easterly ditch along Carroll Way which will also re-establish the drainage pattern within the ROW. The proposed grading plan and storm drain design showing the proposed improvements is provided in Appendix VII. See Figure 4 below for a post development layout. �1------------------- --- Ki-� � Iii' � '� i�l � If ',_o Figure 4: Post development Condition c. Contributing off-site drainage Off site drainage from existing developments to the north is contributed to the project site via the road side ditches along Sheratin Road and Carroll Way. As noted in the pre -development conditions, an existing cross culvert within Carroll Way, as well as a lack of ditch on the east side of the road, allows concentrated runoff to be directed into the project where it eventually flows to the properties further south. This runoff quantity was not included in the analysis as the proposed grading plan and new culverts re-establish these flows back into the Carroll Way ROW. 4 It is anticipated that the upslope portion of the property that is not part of Phase 1 will be cleared of the mature trees and stabilized in preparation for future development. This area was included in the analysis and modeled as "Grass" in "Good Condition." A grassed swale will be installed on the Lot 1/Lot 2 property boundary to collect runoff from Lot 2 and direct it to the ditch along Carroll Way. See the proposed grading plan in Appendix VII. d. Floodways, floodplains, and wetlands There are no floodways, floodplains or wetlands associated with this project. e. Pre -development runoff analysis 1) Watershed area The project area consists of sloping topography with underbrush and mature trees. One, 2.5 acre drainage basin exists on site which drains to the adjacent properties southeast of the project. A predevelopment watershed map is shown in Appendix I. 2) Time of concentration SCS TR -55 was used to calculate time of concentration (TOC) values with a minimum allowable TOC of 5 minutes. The time of concentration for the pre - development condition is approximately 19 minutes. The time is based on an undeveloped site with mature vegetation. The calculations are provided in Appendix II. 3) Precipitation model SCS Type 1A Cumulative Dimensionless 24-hour Rainfall Distribution in 6 minute increments was used for the precipitation model. Rainfall depths for the 25 year storm event for Kodiak were taken from NOAA data which is included in Appendix V. 4) Rainfall loss method Not applied to this analysis. 5) Runoff model SCS TR -55 was used to model the rainfall runoff. 5 6) Summary of pre -development runoff Totals provided are the summation of peak inflow, in cfs, for the pre - development basins that contribute to off-site runoff. 25-vea r. 24-hour Outfall Ncde IO Flow Average Peek Frequency Flow Inflow (%) c=s c=9 _________________________.______________________ OUTFA L c'3_73 0.25 0.94 ----------------------------------------------- System E3_73 0.25 0-94 Pre -development analysis calculations are located in Appendix II. f. Post -development Runoff Analysis 1) Watershed area The total watershed area does not change with the proposed development, however the number of sub -basins increases to seven. Runoff generated within Phase 1 is illustrated by five sub -basins that direct runoff to the interior storm drain system. Runoff generated uphill within Phase 2 is illustrated by two sub -basins which drain downhill to a swale located between Phase 1 and 2. This swale directs runoff south towards the Carroll Way ROW. A post -development watershed map is located in Appendix III. 2) Time of concentration SCS TR -55 was used to calculate time of concentration (TOC) values with a minimum allowable TOC of 5 minutes. Due to the increased impervious areas and the reduced drainage paths a time of concentration of 5 minutes was used for all sub -basins. 3) Precipitation model SCS Type 1A Cumulative Dimensionless 24-hour Rainfall Distribution in 6 minute increments was used for the precipitation model. Rainfall depths for the 25 year storm event for Kodiak were taken from NOAA data which is included in Appendix V. 0 4) Rainfall loss method Not applied to this analysis. 5) Runoff model SCS TR -55 was used to model rainfall runoff. 6) Summary of post -development runoff Totals provided are the summation of peak inflow, in cfs, for all post - development sub -basins that contribute to runoff that leaves the site. 25-vea r. 24-hour Outfall Ncde IO Flow Average Peak Frequency Flow Inflow (%) cis cfa _______________________________.________________ OUT = ----------------------------------------------- 92_12 0.30 1.77 System 92-12 0.30 1.77 Post -development analysis results are located in Appendix IV. The post - development analysis assumes no contributing offsite drainage. All post development runoff from the project site (Phases 1 and 2) is directed to the drainage ditch along Carroll Way. 3. Stormwater Conveyance Design a. Storm sewer Approximately 395 lineal feet of 15" diameter polypropylene storm drain pipe and four top inlet storm manholes are proposed to collect Phase 1 runoff. Pipe grades range from 0.5% to 0.8% and were modeled with a Manning's roughness of 0.013. Design flow capacity of the 15" storm main at 0.5% is approximately 4.0 cfs. Peak flows of 1.3 cfs are encountered during the 25 year storm. In summary, the peak flows of the 25 -year, 24-hour event require approximately 30% of the system's conveyance capacity. No surcharging occurs during the analysis of the 25 year event. See Figure 5 below for a profile plot of the system and maximum hydraulic gradient (HGL) during the 25 year storm event. 7 Main St St", Sewn 1965.. S .. .. �.e. xs 985.. .... ... -... _... u.n a- ........ .... .. .... y. ... ... .. ... am u ww G x a Figure 5: Maximum HGL during 25 yr -24 hr Storm Event b. Culverts Two 24" polypropylene culverts are proposed along the easterly drainage ditch for Carroll Way. One culvert is located at the project entrance and the second is located across the downhill neighbor's driveway (Lot 11A). Both culverts have a slope of 5%, a capacity of 50.5 cfs, and were modeled with a Manning's roughness of 0.013. Runoff from Phase 2 of the site contributes a peak flow of 0.49 cfs during the 25 - year event, which is less than 1% of the entrance culvert's capacity. The majority of the runoff from the proposed development is discharged to the ditch on the downstream side of this culvert. The second culvert, located at the downhill neighbor's driveway experiences a peak flow of 1.80 cfs which is roughly 4% of the design capacity of the pipe. c. Open channel flow Runoff from Lot 2 (Phase 2), upslope of the project, is collected by a grassed drainage swale located between Phase 1 and Phase 2 and then directed to the grassed drainage ditch along Carroll Way. The proposed grassed Swale is 1.5 feet deep with a top width of 6 feet, and 2:1 side slopes. It was modeled with a Manning's roughness value of 0.032. Approximately 0.25 cfs is directed to this ditch from runoff generated from the stabilized portion of Phase 2. Max velocity attained during the 25 year event is roughly 0.78 ft/sec which is below the 2.0 ft/sec velocity generally considered acceptable for unlined channels. The proposed drainage ditch along the east side of Carrol Way is approximately 2 to 3 feet deep with a side slope of 2:1, and a longitudinal slope of 9%+, resulting in a H. mu u e _ 97 965 96 / lertyl'd190tt 95.5... .nue ...... '. .... .. ... . L.DL 414 .. ... SbFe CACB9Ntl. .. .. 'm .. ... , .. ienf/h 1162/X LPVLi Y7f Lmph 017Sll M1 Sil Dn krvM 9^49tl 99.5 �+ �..Lu*DLiY1.26. L 92NIt Gm 115fl $bpe 9995U N1t LI, trvM 6219tt 936 --. �'.. i 'SN Sbpe 9.9993 Anw. Lp1 giQtt 5bpe099591V11 9,mft UAvrveiC91798 9n tv+ert 91 BI. R. - ......... .... 925-- 91 905 . . .. SO 695.. t+99 1+]11 t+n9 1+M 1+P9 ]+fill NP 9 5W.-00 —11 ,,4n 3+H1 1+ P9 a.M 3+29 nH9 4.M 6.P11 5+M Figure 5: Maximum HGL during 25 yr -24 hr Storm Event b. Culverts Two 24" polypropylene culverts are proposed along the easterly drainage ditch for Carroll Way. One culvert is located at the project entrance and the second is located across the downhill neighbor's driveway (Lot 11A). Both culverts have a slope of 5%, a capacity of 50.5 cfs, and were modeled with a Manning's roughness of 0.013. Runoff from Phase 2 of the site contributes a peak flow of 0.49 cfs during the 25 - year event, which is less than 1% of the entrance culvert's capacity. The majority of the runoff from the proposed development is discharged to the ditch on the downstream side of this culvert. The second culvert, located at the downhill neighbor's driveway experiences a peak flow of 1.80 cfs which is roughly 4% of the design capacity of the pipe. c. Open channel flow Runoff from Lot 2 (Phase 2), upslope of the project, is collected by a grassed drainage swale located between Phase 1 and Phase 2 and then directed to the grassed drainage ditch along Carroll Way. The proposed grassed Swale is 1.5 feet deep with a top width of 6 feet, and 2:1 side slopes. It was modeled with a Manning's roughness value of 0.032. Approximately 0.25 cfs is directed to this ditch from runoff generated from the stabilized portion of Phase 2. Max velocity attained during the 25 year event is roughly 0.78 ft/sec which is below the 2.0 ft/sec velocity generally considered acceptable for unlined channels. The proposed drainage ditch along the east side of Carrol Way is approximately 2 to 3 feet deep with a side slope of 2:1, and a longitudinal slope of 9%+, resulting in a H. capacity of roughly 190 cfs when flowing full. A Manning's roughness value of 0.032 was used for the drainage ditches. The proposed development contributes 1.77 cfs peak flow during the 25 -year event, which is less than 1% of the total ditch capacity. See Figure 6 below for a profile plot illustrating the maximum hydraulic grade line of the ditch and culvert along Carroll Way. Figure 6: Maximum HGL of Ditch & Culverts for Carroll Way d. Hydraulic model This project was analyzed using SCS TR -55 methodology and the storm water modeling program, Autodesk Storm & Sanitary Analysis 2015, version 9.1.140.1. e. Operations and Maintenance The drainage ditches and culvert at the project entrance should be checked annually and kept clear of litter and debris. The onsite driveway and parking area should be swept bi-annually to ensure that dirt and debris does not accumulate and prevent proper drainage function. 4. References 1. NOAA https://hdsc.nws.noaa.gov/hdsc/pfds/pfds map al<.html 2. Alaska Department of Transportation, June, 1995: Alaska Highway Drainage Manual; Chapter 7. Hydrology W Men Shed Slam S— ews 171 170 ......_.. '........ .:........:. ... ... ... .., ..,....... .... . ............ ,....._. .. ... .... ....., ....... 109 . ....:.......... ......... . ....:......... ..................... ......................... ....................... .. .... _.. .. .. .. .... ........ lai11D W-22 __. .. 199 ....i._ ...._... .. .... ................... ............... ........ L--_..... _.. ....—'— ..... _.. ...._,. ,�------ .. 1117 107 _ i. _ _. . _ _ .. . _. _. .. L 8 9bppm9 Jm C „ 10261 109 ......;... ........ .....,.. .1 ....... ......... _�........;..... n .... V .�. _. ... _! W _...._ 109 ......:.........q..........,..........,.... ,------..,........,...... _. ,....... ..... o _ lIe wl 1w _..;.. .._.,...__._,. ._.._,....._ ,......._; ........... ..... y.V lw ism n _ 103 ................................... .... .. 102 :..........«......... i ........... ...... .. .........: ....len�h a200R _ 2501L. Slpp OOSQQJIJI! ....I wlwa196001t 101 ........_'--- . -...... _..... ..L" i .......Ola Sb0a0.1119" Q „... 0 rrnerf 9970'�fl 100 .. ... �. .. __;. W ... ....:. .. --------- § .;..__ d.Mbe9100n 2 9e ;...a t els m.W , o.,S ulk oLrk-m �" M.. 92.. -l�1;an.oafl. o.m D. 4AO II 91 x°s 2. u. ... Sl7 'A.%+n. .. . _ . , - :.._IIri BiveR 65'00 X.. ....].so 1.00 1,10 1.20 1.30 1.40 1.50 1.60 1.70 1.00 1,90 2,00 ZNn 2.20 2.30 2— 2„A 2,60 2.]0 slanan(nl Figure 6: Maximum HGL of Ditch & Culverts for Carroll Way d. Hydraulic model This project was analyzed using SCS TR -55 methodology and the storm water modeling program, Autodesk Storm & Sanitary Analysis 2015, version 9.1.140.1. e. Operations and Maintenance The drainage ditches and culvert at the project entrance should be checked annually and kept clear of litter and debris. The onsite driveway and parking area should be swept bi-annually to ensure that dirt and debris does not accumulate and prevent proper drainage function. 4. References 1. NOAA https://hdsc.nws.noaa.gov/hdsc/pfds/pfds map al<.html 2. Alaska Department of Transportation, June, 1995: Alaska Highway Drainage Manual; Chapter 7. Hydrology W 5. Appendix I. Pre -development Watershed Map II. Pre -development Results & Calculations 25 year, 24 hour III. Post -development Watershed Map IV. Post -development Results & Calculations 25 year, 24 hour V. NOAA Kodiak Rainfall Data VI. Boundary & Topo Survey for Lot 1, Block 3, First Addition Kadiak Alaska Subdivision VII. Grading Plan & Storm Design 10 Predevelopment Watershed Map II. Predevelopment Results & Calculations 25 year 24 hour Storm Project Description File Name ................. Pred— 7.31.1S.SPF Analysis options Flow units ................ ofs Subbasin Hydrograph Method. SCS TR -55 Time of Concentration...... SCS TR -55 Link Routing Method ....... Hydrodynamic Storage Node Exfiltration.. Constant rate, free surface area Starting Date ............. APR -11-2016 00:00:00 Ending Date ............... APR -12-2016 06:00:00 Report Time Step .......... 00:05:00 Element +Count Number*of+rain gages ...... 1 Number of subbasin: ....... 1 Numberof node: ........... 2 Number of links ........... 1 ++++++++++++++++ Raingage summary ++++++++++++++++ Gage Data Data Recording ID Source Type Interval ____________________________________________________________ Rain Gage 25 -yr CUMULATIVE 6.00 ++++++++++++++++ Subbasin Summary ++++++++++++++++ ubbasin Total S Area ID acre: SUS -1 2.50 Node Summary Node Element Invert Maximum Ponds d External ID Type ElevationElev. Area Inflow ft £t ft' ______________________________________________________________________________ Jun -20 JUNCTION 90.00 93.00 0.00 OUTFALL OUTFALL 89.50 92.00 0.00 Link Summary Link From Node To Node ID __________________________________________ Link -25 Jun -20 OUTFALL Cress Section Summary Link Shape Depth/ ID Diameter ft __________________________________________ Link -25 TRIANGULAR 2.50 Volume Runoff Quantity Continuity acre -ft To, Precipitation ...... 1.002 Surface Runoff ........... 0.040 Continuity Error (B) ..... 0.000 •••••++• ••••••••• Volume Flow+Routing Continuity acre -ft External Inflow .......... 0000 External Outflow ......... 0.,397 Initial Stored Volume .... 0.000 Final Stored Volume ...... 0.000 Continuity Error (B) ..... 0.000 Composite Curve Number Computations Report Subbasin SUB -1 Element Length Slope Mannings Type ft B Roughness ---------------------- CHANNEL 10.0 5.0000 0.0320 Width No. of Cross Full Flow Harrel. sectional Hydraulic Area Radius £t ft' ft ---------------------------------------------- 10.00 1 12.50 1.12 Depth inches 4.809 0.191 Volume Mgallon: 0.000 0.129 0.000 0.000 Area soil Soil/Surface Description (acre:) Group CN ______________________________________________________________________ Wood., Good 2.50 C 70.00 Composite Area 6 Weighted CN 2.50 70.00 SCSTR-55 Time of Concentration Computation: Report Sheet Flow Equation Design Flow Capacity efe 139.82 To = (0.007 a ((n a Lf)'D.B)) / ((P^0.5) a (Sf-0.4)) Where. To = Time of Concentration (hra) n - Mannings Roughness Lf = Flow Length (ft) P - 2 yr, 24 hr Rainfall (inches) Sf = Slope (ft/ft) Shallow Concentrated Flow Equation V - 16.1345 a (Sf-0.5) (unpaved surface) V = 20.3282 a (Sf-0.5) (paved surface) V = 15.0 + (Sf-0.5) (grassed waterway surface) V - 10.0 a (Sf-0.5) (nearly bare c untilled surface) V 9.0 • (Sf-0.5) (cultivated straight rows surface V = 7.0 • (Sf-0.5) (short grass pasture surface) V 5.0 * (Sf-0.5) (woodland surface) V 2.5 + (WO.5) (forest w/heavy litter surface) To (Lf / V) / (3600 sec /hr) Where To Time of Concentration (bra) Lf = Flow Length (ft) V Velocity (ft/sec) Sf Slope (ft/ft) Channel Flow Equation V - (1.49 + (R"(2/3)) a (Sf^0.5)) / R - Aq / Wp To = (Lf / V) / (3600 see /hr) Where. To Time of Concentration (bra) Lf Flow Length (ft) R Hydraulic Radius (ft) Aq = Flow Area (ft') Wp Wetted Perimeter (ft) V = Velocity (ft/see) of = Slope (ft/ft) n = Manning's Rough.... Subbasin SUR -1 Sheet Flow Computations shallow Concentrated Flow Computations Subarea R Subarea A Mannings Roughness: 0.40 Flow Length (ft): 85.00 Slope (8): 16.00 2 yr, 24 hr Rainfall (in): 2.90 Velocity (ft/sec): 0.16 Computed Flow Time (minutes): 8.62 shallow Concentrated Flow Computations Subarea R Subarea C 0.40 0.00 65.00 0.00 10.00 0.00 2.90 0.00 0.13 0.00 8.40 0.00 Subarea A Subarea B Subarea C Flow Length (ft): 100.00 0.00 0.00 slope (%): 4.00 0.00 0.00 Surface Type: Woodland Unpaved Unpaved Velocity (ft/sec): 1.00 0.00 0.00 Computed Flow Time (minutes): 1.67 0.00 0.00 Total TOC (minutes): 18.68 +a+++aaa Subbasin Runoff Summary aaa•:masa+:++++++++masa ------------------------------------ Subbasin Total Total ID Precip Runoff in in ------------------------------------ SUN-1 4.82 1.90 aaaaaaaaaaarra::+♦ Node Depth Summary Peak Weighted Time of Runoff Curve Concentration efs Number day. hh:-i s. ---------------------------------- 0.94 70.000 0 00:18:40 Node Average Maximum Maximum Time of Max Total Total Retention ID Depth Depth NOL Occurrence Flooded Time Time Attained Attained Attained Volume Flooded ft ft ft days hh:sm acre -in minutes hh: mm:as ----------------------------------------------------------------------------------------- Jun-20 0.15 0.41 90.41 0 08:10 0 0 0:00:00 OUTFALL D.15 0.38 89.88 0 08:11 0 0 0:00:00 Node #Flow Summary Node Eleeent Maximum Peak Time of Maximum Timeof Peak ID Type Lateral Inflow Peak Inflow Flooding Flooding Inflow Occurrence Overflow Occurrence cfs cfs day. hh:mm e£s days hh:mm ------------------------------------------------------------------------------------ Jun-20 JUNCTION 0.94 0.94 0 08:10 0.00 OUTFALL OUTFALL 0.00 0.94 0 08:11 0.00 .aaaa•a++aaaaa+aa+++++. Outfall Loading Summary ++••.a..aaaiaaaaa+a+a.. ----------------------------------------------- Outfall Node ID Flow Average Peak Frequency Flow Inflow M of. cfe ----------------------------------------------- OUTFALL 63.73 0.25 0.94 ----------------------------------------------- Sy.tem 63.73 0.25 0.94 +iris+•+++iiia+•• Link Flow Summary --------------------------------------------------------------------------------------------------------------------- Link ID Element Time of Maximum Length Peak Flow Design Ratio of Ratio of Total Reported Type Peak Flow Velocity Factor during Flow Maximum Maximum Time Condition Occurrence Attained Analysis Capacity /Design Flow Surcharged days hh:mm ft/see cfs cfs Flow Depth minute. ---------------------------------------------------------------------------------------------------------------------- Link-25 CHANNEL 0 08:11 3.02 52.59 0.94 139.82 0.01 0.16 0 Calculated a++++.•+++a#i##+++..a..•a••ai.+• Highest Flow Instability Indexes All link. are stable. Analysis began on: Ned Aug 01 09:36:13 2018 Analysis ended on: Red Aug 01 09:36:14 2018 Total elapsed time: 00:00:01 Postdevelopment Watershed Map IV. Postdevelopment Results & Calculations 25 year 24 hour Storm Project Description File Name ................. Postdev 7.31.18.SPF ++++++++++++++++ Malysis options Flow Units ................ ofs S=asin Hydrograph Method. SCS TR -55 Time of Concentration...... SCS TR -55 Link Routing Method ....... Hydrodynamic Storage Node Exfiltration.. Constant rate, free surface area Starting Date ............. APR -11-2016 00:00:00 Ending Date ............... APR -12-2016 06:00:00 Report Time Step .......... 00:05:00 a Element Count Numberofrain gages ...... 1 Number of subbasins ....... 7 Number of nodes ........... 11 Number of links ........... 10 aaaaraaaaaraaaaa Raingage Summary araaraaraaraarar Gage Data Data ID Source Type Rain Gage 25 -yr rrrrrarrrr:rr rar Subbasin Summary Subbasin Total Area ID acres SUB -1 0.50 SUB -2 0.50 SUB -3 0.25 SUB -4 0.30 SUB -5 0.36 SUB -6 0.27 SUB -7 0.07 NodeSummary Node Element ID Type ____________________________ CBMH-A JUNCTION CBMH-B JUNCTION CBMH-C JUNCTION Jun -20 JUNCTION Jun -21 JUNCTION Jun -22 JUNCTION Jun -23 JUNCTION Jun -24 JUNCTION Jun -25 JUNCTION SDCB-D JUNCTION Out -08 OUTFALL LinkSummary (B) ..... Linkaaaaaaar From Node ID ---------------------------- Link-19 SDCB-D Link -20 CBMH-C Link -21 CBMH-B Link -22 Jun -21 Link -23 Jun -22 Link -24 Jun -23 Link -25 Jun -20 Link -26 CBMH-A Link -27 Jun -24 Link -28 Jun -25 rrrr rr rrrr rr rrr Cross Section rrrrirr rr rrrrr rrr rrr Summary rrrr rrr Link Shape ID Link -19 CIRCULAR Link -20 CIRCULAR Link -21 CIRCULAR Link -22 TRIANGULAR Link -23 CIRCULAR Link -24 TRIANGULAR Link -25 TRIANGULAR Link -26 CIRCULAR Link -27 TRIANGULAR Link -28 CIRCULAR aaaaaaaaaa rrrsasae Runoff Quantity as sa aaaaaaaraaa aaaaaaa as aaaaaa Continuity sa as Total Precipitation ...... Surface Runoff ........... Continuity Error (B) ..... CUMULATIVE Recording Interval 6.00 Invert Maximum Panded External Elevation El- Area Inflow ft ft ft' ----------------------------------------- 89.90 97.75 0.00 90.31 96.43 0.00 90.90 97.32 0.00 91.00 93.50 0.00 102.51 105.01 0.00 98.00 101.00 0.00 95.70 98.70 0.00 103.00 105.00 0.00 87.00 89.50 0.00 91.69 98.18 0.00 85.00 87.00 0.00 To Node CBHH-C CBMH-B CBMH-A Jun -22 Jun -23 Sun -20 Jun -25 Sun -20 Jun -21 Out -OB Depth/ Diameter ft 1.25 1.25 1.25 2.50 2.00 2.50 2.50 1.25 1.50 2.00 Volume acre -ft 0.902 0.061 0.000 Element Type CONDUIT CONDUIT CONDUIT CHANNEL CONDUIT CHANNEL CHANNEL CONDUIT CHANNEL CONDUIT Width ft 1.25 1.25 1.25 10.00 2.00 10.00 10.00 1.25 6.00 2.00 Depth inches 4.809 0.328 Length Slope Manning's ft 8 Roughness 99.0 0.7980 0.0130 118.2 0.4991 0.0130 81.8 0.5015 0.0150 50.0 9.0200 0.0320 46.0 5.0000 0.0130 42.0 11.1905 0.0320 10.0 40.0000 0.0320 92.1 0.4344 0.0130 230.0 0.2130 0.0320 40.0 5.0000 0.0130 No. of Cross Full Flow Barrels Sectional Hydraulic Area Radius ft' ft --------------------------------- 1 1.23 0.31 1 1.23 0.31 1 1.23 0.31 1 12.50 1.12 1 3.14 0.50 1 12.50 1.12 1 12.50 1.12 1 1.23 0.31 1 4.50 0.67 1 3.14 0.50 Design Flow Capacity cfs 5.77 4.56 3.96 187.80 50.59 209.17 395.47 4.26 7.39 50.59 +++ Volume Volume Flow Routing ContinuitySer r rrrrr:rrrrr:rrrrrrr:rrrr• a -£t Mgallone External Inflow .......... _________ 0.000 --------- 0.000 External Outflow ......... 0.615 0.200 Initial Stored Volume .... 0.000 0.000 Final Stored Velums ...... 0.000 0.000 Continuity Error (6) ..... 0.000 _________________ Subbasin SUB -3 _________________ Composite Curve Number Computations Report rrr+rr♦aarrrr rraraaar: raarrr::ara:rrrrraaa Subbasin SUB -1 _________________ Area Soil/Surface Description -------------------------------------------------------------- (acres) > 756 grass .- r, Good 0.50 Composite Area L Weighted CN 0.50 _________________ Subbasin SUB -2 _________________ Area sail/Surface Description ______________________________________________________________ (acres) > 756 grass c ove r, Good 0.50 Composite Area s Weighted CN 0.50 _________________ Subbasin SUB -3 _________________ Are Soil/Surface Description (aor es) r _____________________________________________________________ Paved parking 6 ,oafs 0.23 > 756 grass cover, Good 0.02 Composite Area s Weighted CN 0.25 _________________ Subbasin SUB -4 _________________ Area sail/Surface Description __________________________________________________________ (ae ea) Paved parking c roofs 0.28 > 756 graaa cover, Good 0.02 Composite Area c Weighted CN 0.30 _________________ Subbaein SUB -5 _________________ Area Soil/Surface Description (acres) ______________________________________________________________ Paved parking s roofe 0.33 > 756 graaa cover, Good 0.03 Composite Area c Weighted CN 0.36 _________________ Subbasin SUB -6 _________________ Area Soil/Surface Description (acres) ______________________________________________________________ Paved parking 6 roofs 0.25 > 756 graaa cover, Good 0.02 Composite Area 6 Weighted CN 0.27 _________________ Subba.in SUB -7 _________________ Area Soil/surface Description _________________________________________________________ (ac ea) Paved parking S roof, 0.02 > 756 gra aa cover, Good 0.05 Composite Area 6 Weighted IN 0.07 ::rrrr r♦:r:r::r:r r:rrrrrrrrrr rrr:r::rr:rrar:::rrrar SCS TA -55 Time oP Concentration Computations Report :rrr:rrr:::rr:r:rr:rrrrrrrrrrr+rrr:r:r rrrar::rrr rr+ Sheet Flow Equation ___________________ Tc - (0.007 + ((n + Lf)^0.8)) / ((P^0.5) • (Sf^0.4)) Where. To = Time of Concentration (hrs) n Nanning'. Roughness Lf = Flow Length (ft) P : 2 yr, 24 hr Rainfall (inches) Sf Slope (ft/ft) Shallow Concentrated Flow Equation soil Group CN ----------------- C 74.00 74.00 Soil Group IN C 74.00 74.00 Soil Group CN B 98.00 B 61.00 95.04 Soil Group IN B 98.00 B 61.00 95.53 Soil Group IN B 98.00 B 61.00 94.92 Soil Group CN ----------------- B 98.00 B 61.00 95.26 Soil Group CN H 98.00 B 61.00 71.57 V = 16.1345 + (Sf^0.5)(unpaved surface) V = 20.3282 * (sf^0.5) (paved surface) V = 15.0 * (Sf^0.5) (grassed waterway surface) V = 10.0 * (Sf^0. 5) (nearly bare 6 un tilled surface) V = 9.0 * (Sf^0.5) (cultivated straight rows surface) V = 7.0 *(Sf^0.5) (short grass pasture surface) V = 5.0 * (Sf^0.5) (woodland surface) V = 2.5 + (Sf^0.5) (forest w/heavy litter surface) To = (Lf / V) / (3600 sec/hr) Where. Te = Time of Concentration (hrs) Lf = Flow Length(ft) V = Velocity (ft/sec) Sf = Slope (ft/ft) Channel Flow Equation --------------------- V = (1.49 * (R^(2/3)) * (sf^0.5)) / n R = Aq / Wp To = (Lf / V) / (3600 sec/hr) Where: To = Time of Concentration (hrs) Lf = Flow Length (ft) R = Hydraulic Radius (ft) Aq = Flow Area (ft') Wp = Wetted Perimeter (ft) V = Velocity (ft/see) Sf = Slope (ft/ft) n = Manning s Roughness ----------------- Subbasin SUB -1 ----------------- User-Defined TOC override (minutes): 5.00 ----------------- Subbasan SUB -2 ----------------- User-Defined TOC override (minutes): 5.00 ----------------- Subbasin SUB -3 ----------------- User-Defined TOC override (minutes): 5.00 ----------------- Subbasin SUB -4 ----------------- User-Defined TOC override (minutes): 5.00 ----------------- Subbasin SUB -5 User -Defined TOC override (minutes): 5.00 ----------------- Subbasin SUB -6 ----------------- User-Defined TOC override (minutes): 5.00 ----------------- Subbasin SUB -7 User -Defined TOC override (minutes): 5.00 *********************** Subbasin Runoff Summary Subbasin Total Total Peak Weighted Time of ID Precip Runoff Runoff Curve Concentration in in cfe Number days hh:mm:ss -------------------------------------------------------------------------- SUB-1 4.82 222 0.25 74.000 0 00:05:00 SUB -2 4.82 2.22 0.25 74.000 0 00:05:00 SUB -3 4.82 4..25 027 95.040 0 00:05:00 SUB -4 4.82 4.30 0.33 95.530 0 00:05:00 SUB -5 4.82 4.23 0..39 94.920 0 00:05:00 SUB -6 4.82 4.27 0.30 95.260 0 00:05:00 SUB -7 4.82 2.02 0.03 71.570 0 00:05:00 Node Depth Suvm�ary Node Average Maximum Maximum Time of Max Total Total Retention ID Depth Depth HGL Occurrence Flooded Time Time V. VI. VII. ................. Node Flow Summary .......+++++...a. Node Attained Attained Attained Time of Maximum Time of Peak ID Volume Flooded Inflow Peak ft ft Flooding ft days hh:msa Inflow acre -in minutes hh: mm:ss ----------------------------------------------------------------------------------------- CBMH-A 1.65 2.00 91.90 0 08:00 hh:- 0 0 0:00:00 CBMH-B 1.63 1.95 92.26 0 07:59 Link -21 0 0 0:00:00 CBMH-C 1.59 1.81 92.71 0 07:57 JUNCTION 0 0 0:00:00 Jun -20 0.14 0.36 91.36 0 08:04 1.80 0 0 0:00:00 Jun -21 0.11 0.31 102.82 0 08:05 08:04 0 0 0:00:00 Jun -22 0.04 0.14 98.14 0 08:06 1.00 0 0 0:00:00 Jun -23 0.10 0.27 95.97 0 08:07 JUNCTION 0 0 0:00:00 Jun -24 0.18 0.49 103.49 0 08:05 1.80 0 0 0:00:00 Jun -25 0.09 0.29 87.29 0 08:06 07:55 0 0 0:00:00 SDCB-D 1.56 1.69 93.38 0 07:56 0 0 0:00:00 Out -08 0.08 0.26 85.26 0 08:06 0 0 0:00:00 ................. Node Flow Summary .......+++++...a. Node Element Maximum Peak Time of Maximum Time of Peak ID Type Lateral Inflow Peak Inflow Flooding Flooding Occurrence Attained Inflow Analysis Occurrence Overflow Occurrence ------------------------------------------------------------------------------------ cfs cfs days hh:- cfa days hh:mm CBMH-A JUNCTION 0.30 1.30 0 07:59 0.00 Link -21 CBMH-B JUNCTION 0.39 1.00 0 07:57 0.00 0 08:05 CBMH-C JUNCTION 0.33 0.61 0 07:56 0.00 15.73 Jun -20 JUNCTION 0.00 1.80 0 08:03 0.00 Link_ 25 Jun -21 JUNCTION 0.25 0.51 0 08:04 0.00 0 08:00 Jun -22 JUNCTION 0.00 0.51 0 08:05 0.00 1.00 Jun -23 JUNCTION 0.03 0.53 0 08:05 0.00 Jun -24 JUNCTION 0.25 0.25 0 08:00 0.00 Jun -25 JUNCTION 0.00 1.80 0 08:05 0.00 SDCB-D JUNCTION 0.27 0.27 0 07:55 0.00 Out -08 OUTFALL 0.00 1.80 0 08:06 0.00 ....................... outfall Loading 5ummary outfall Node ID Flow Average Peak Frequency Flow Inflow (8) ef. cfs Out -08 82.12 0.30 1.BO ----------------------------------------------- system -------------------------------' -system 82.12 0.30 1.80 Link Flow Sunmury Link ID Element Time of Maximum Length Peak Flow Type Peak Flow Velocity Factor during Occurrence Attained Analysis days hh:mm ft/sec cfa ------------------------------------------------------------ Link-19 CONDUIT 0 07:56 1.60 3.35 0.27 Link -20 CONDUIT 0 07:58 1.93 2.55 0.61 Link -21 CONDUIT 0 07:59 2.32 3.51 1.00 Link _22 CHANNEL 0 08:05 5.02 12.82 0.51 Link -23 CONDUIT 0 08:06 3.02 15.73 0.50 Link -24 CHANNEL 0 08:07 2.76 16.48 0.53 Link_ 25 CHANNEL 0 08:05 8.51 113.95 1.80 Link_ 26 CONDUIT 0 08:00 3.45 3.20 1.30 Link -27 CHANNEL 0 08:05 0.78 1.00 0.25 Link_ 28 CONDUIT 0 08:06 6.96 18.10 1.80 a..a....aa.aaa.....♦+...aaaaa... Highest Flow Instability Indexes +..+a+..+..r..... sett..a.aaaa.es All links are stable. DesignRatio of Ratio of Total Reported Flow Maximum Maximum Time Condition Capacity /Design Flow Surcharged cfs Flow Depth minutes ---------------------------------------------------- 5.77 0.05 0.20 0 Calculated 4.56 0.13 0.30 0 Calculated 3.96 0.25 0.38 0 Calculated 187.80 0.00 0.09 0 Calculated 50.59 0.01 0.10 0 Calculated 209.17 0.00 0.13 0 Calculated 395.47 0.00 0.13 0 Calculated 4.26 0.30 0.35 0 Calculated 7.39 0.03 0.27 0 Calculated 50.59 0.04 0.14 0 Calculated WARNING 002 Max/rim elevation (depth) increased to a unt for c ::ting conduit height dimensions for Node Jun -20. WARNING 002 Max/rim elevation (depth) i sed to a unt for connecting conduit height dimensions for Node Jun -21. WARNING 002 Max/rim elevation (depth) increased to account for connecting conduit height dimensions for Node Sun -25. Analysis began o . Fri Aug 03 08:19:55 2018 Analysis ended on: Fri Aug 03 08:19:56 2018 Total elapsed time: 00:00:01 NOAA Kodiak Rainfall Data (Attached) Boundary & Topo Survey for Lot 1, Block 3, First Addition Kadiak Alaska Subdivision (Attached) Grading Plan & Storm Design (Attached) NOAA Atlas 14, Volume 7, Version 2 Location name: Kodiak, Alaska, USA* Latitude: 57.7852°, Longitude: -152.3478° Elevation: -1000000 ft** ; ? source: ESRI Maps "source: USGS POINT PRECIPITATION FREQUENCY ESTIMATES Sanja Perica, Douglas Kane, Sarah Dietz, Kazungu Maitaria, Deborah Martin, Sandra Pavlovic, Ishani Roy, Svetlana Stuefer, Amy Tidwell, Cad Trypaluk, Dale Unruh, Michael Yekta, Erica Betts, Geoffrey Bonnin, Sarah Heim, Lillian Hiner, Elizabeth Lilly, Jayashree Narayanan, Fenglin Yen, Tan Zhao NOAH, National Weather Service, Silver Spring, Maryland and University of Alaska Fairbanks, Water and Environmental Research Center PF tabular I PF graphical I Maps & aerials PF tabular PDS -based point precipitation frequency estimates with 90% confidence intervals (in inches)' Average recurrence interval (years) Duration 1 2 5 10 ������� 25 50 100 200 500 1000 0.114 0.13 -47F --0.-16-67F-0.191 0.227 0.255 0.282 0.320 0.368 0.405 5 -min (0.089-0.149) (0.103-0.178) (0.124-0.227) (0.139-0.267) (0.161-0.328) (0.176-0.376) (0.191-0.426) (0.212-0.494) (0.237-0.584) (0.255-0.656) 0.153 0.180 0.222 0.257 0.305 0.342 0.379 0.429 0.494 0.544 10 -min (0.119-0.200)(0.138-0.240) (0.165-0.304) (0.187-0.360) (0.216-0.440) (0.237-0.505) (0.256-0.572) (0.284-0.662) (0.318-0.784) (0.343-0.881) 0.179 0.211 0.260 0.301 0.357 0.400 0.444 -O.-SO2--]F-O.-57-97F-O.-63-77 15-min (0.140-0.234) (0.162-0.281) (0.194-0.356) (0.219-0.422) (0.253-0.515) (0.277-0.590) (0.300-0.670) (0.332-0.774) (0.373-0.919) (0.401-1.03) 0.237 0.280 0.345 0.399 0.474 0.531 0.589 0.666 0.768 0.845 30 -min (0.185-0.310) (0.215-0.373) (0.257-0.472) (0.291-0.559) (0.335-0.684) (0.367-0.784) (0.398-0.889) (0.441-1.03) (0.494-1.22) (0.533-1.37) 0.325 0.383 0.473 0.547 0.649 0.728 0.807 0.913 1.05 1.16 60 -min (0.253-0.425) (0.294-0.510) (0.353-0.648) (0.399-0.766) (0.459-0.937) (0.503-1.08) (0.546-1.22) (0.604-1.41) (0.677-1.67) (0.730-1.88) 0.515 0.607 0.750 0.868 1.03 1.16 1.28 1.45 -I.-67--]F-1.-83-7 2 -hr (0.402-0.674) (0.465-0.808) (0.559-1.03) (0.633-1.22) (0.729-1.49) (0.799-1.71) 1(0.865-1.93)11(0.956-2.23) 1 (1.07-2.65) (1.16-2.97) 0.703 0.828 1.02 1.19 1.41 1.58 1.74 1.97 2.27 2.50 3 -hr 1(0.548-0.920)1(0.635-1.10) (0.763-1.40) (0.864-1.66) (0.995-2.03) 1 (1.09-2.33) 1 (1.18-2.63) 1 (1.31-3.04) 1 (1.46-3.61) (1.58-4.05) 1.16 1.37 1.69 -'-.9-6--]F--2.-32-7F-2.-60-]F-2.-88- 3.26 -3.-76--]F-4.-14 6 -hr (0.907-1.52)1 (1.05-1.83) 1 (1.26-2.31) 1 (1.43-2.74) 1 (1.64-3.35) 1 (1.80-3.84) 1 (1.95-4.35) 1 (2.16-5.03) 1 (2.42-5.97) 1 (2.61-6.70) 1.74 2.05 2.51 2.89 3.43 3.87 4.32 4.90 5.66 6.23 12 -hr (1.36-2.27) (1.57-2.73) (1.87-3.43) (2.11-4.05) (2.43-4.96) (2.68-5.71) (2.93-6.52) ( 3.24-7.55) ( 3.64-8.98) ( 3.93-10.1) F--2.-47-7F--2.-9O-7F--3--54-7F-4.-06- 4.82 5.44 6.11 6.91 7.97 8.77 24 -hr (2.25-2.73) (2.62-3.26) (3.12-4.06) (3.52-4.74) (4.08-5.76) (4.53-6.62) (4.99-7.57) (5.55-8.71) 5.55-8.71) ( 6.26-10.3) ( 6.77-11.5) 3.87 4.70 5.37 6.31 7.07 7.86 8.75 9.93 10.8 2-day3.27 (2.98-3.62) (3.48-4.34) (4.14-5.39) (4.65-6.27) (5.34-7.54) (5.88-8.60) (6.42-9.73) ( 7.03-11.0) ( 7.80-12.8) ( 8.35-14.2) -4-.52--]F-5.-50-7F--6.-26-7F--7.-32- 8.15 9.00 9.92 11.1 12.1 3-day3.81 (3.48-4.22) (4.07-5.08) (4.85-6.31) (5.43-7.31) (6.19-8.74) (6.77-9.91) (7.35-11.1) (7.96-12.5) ( 8.74-14.3) ( 9.31-15.8) F-4.-25-IF-S.-04--]F-6-.I-l--]F-6.-9-3--]F--8.-O6-7F-8.-93- 9.81 10.8 12.0 12.9 4 -da (3.88-4.71) (4.54-5.66) (5.38-7.00) (6.01-8.09) (6.82-9.62) (7.42-10.9) (8.02-12.1) ( 8.63-13.5) ( 9.42-15.5) ( 9.99-16.9) 5.37 6.27 7.49 8.41 9.66 7F 10.6 11.612.6 13.9 14.9 7 -da (4.90-5.95) (5.65-7.04) (6.60-8.59) (7.29-9.82 (8.18-11.5) (8.83-12.9) (9.46-14.3) (10.1-15.6) (10.9-17.9) ( 11.5-19.5) 6.24 7.22 8.53 9.52 10.8 11.9 12.9 13.9 15.3 16.3 10 -day (5.69-6.91) 1 (6.50-8.11) 1 (7.52-9.78) 1 (8.25-11.1) 1 (9.18-13.0) 1 (9.86-14.4) 1 (10.5-15.9) 1 (11.2-17.5) 1 (12.0-19.6) 1 (12.6-21.3) 8.95 10.3 11.9 13.2 14.8 16.0 17.1 18.2 19.7 20.9 20 -day (8.17-9.91) (9.23-11.5) (10.5-13.7) (11.4-15.4) (12.5-17.6) (13.3-19.4) (14.0-21.2) (14.6-23.0) (15.5-25.4) (16.1-27.3) 11.5 13.1 15.1 16.6 18.5 19.8 21.1 22.3 23.9 25.2 30 -day (10.5-12.7) (11.8-14.7) (13.3-17.3) (14.4-19.4) (15.6-22.0) (16.5-24.1) (17.2-26.1) (17.9-28.1) (18.8-30.8) (19.4-32.9) 14.7 16.8 19.3 21.1 23.3 24.8 26.3 27.6 29.3 30.7 45 -day (13.5-16.3) 1 (15.1-18.9) 1 (17.0-22.2) 1 (18.3-24.6) 1 (19.7-27.8) 1 (20.6-30.2) 11 (21.5-32.5) 1 (22.2-34.7) 1 (23.0-37.8) 1 (23.7-40.1) 17.0 19.5 22.5 24.5 26.9 28.6 30.1 31.4 33.2 34.5 60 -day (15.5-18.9) (17.6-21.9) (19.8-25.8) (21.2-28.6) (22.8-32.1) (23.8-34.8) (24.6-37.2) (25.2-39.6) (26.1-42.8) (26.7-45.2) 1 Precipitation frequency (PF) estimates in this table are based on frequency analysis of partial duration series (PDS). Numbers in parenthesis are PF estimates at lower and upper bounds of the 90% confidence interval. The probability that precipitation frequency estimates (for a given duration and average recurrence interval) will be greater than the upper bound (or less than the lower bound) is 5%. Estimates at upper bounds are not checked against probable maximum precipitation (PMP) estimates and may be higher than currently valid PMP values. 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SO STA! 43+94.881 < O � .18 +O �5--SW-INV-9-3-19-Ou!t------ i--- --- i--._--;.- ------+-------+-$1368-DI rn � X ISI O 'O -i •• T I i I i o O r I i i I ! II Ln F______.}._ -____*______y___ aj- s}..____r______r______r.______�______.y i I i 1 I i I II n LT D I i i I I I I I Ln O - r- m 00 00 to Ll+ O Ln O to Ln 00 Ln O CP N O X D_ Z 0 O O Z rn m 0 S D ;o r\ r 0 0 r v N �m DESICHED I DRAWN aM TAM FM SPRUCE CAPE TOM STORM CHECKED DATE REVISIONS BY KDJ SPRUCE CAPE TOWNHOMES�R=�r STORM IMPROVEMENTS ( S 8 � R y a. 9 �a��$ $3y SenE1 ;=�"g ? 8 g > I m '�'"• � ° 2 � � asw 'aa ;goo v A 4 >o .o Ao A c y 1 Z O D%* ENGINEERING,LLC-.�. P.D. Dox 1119x9 Aneh(907 61-6 99517 (907) 561-653] w.trioduk.com r'yEOrq(q�,I /) \\ham DAG HONES ,D. HD. CASE 16-133 N A DATE: AAB: 21118 NOMZt PARES sDALE. 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