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Serenity Ridge Subdivision Plat,,~~ ~ „ti. ~„ _ City of Dubuque j''"`~~ ~ ~- Planning Services Department ~-~+` ~.-~ ~~ ~ Dubuque IA 52001-4864 Phone: 563-589-4210 ~l,~°' "'A~'- "'''~` Fax: 563-589-4221 PLANNING APPLICATION FORM Variance Rezoning Simple Site Plan Annexation Conditional Use Permit Planned District Minor Site Plan Temporary Use Permit Appeal Preliminary Plat X Major Site Plan Certificate of Appropriateness Special Exception Minor Final Plat Major Final Plat Certificate of Economic Hardship Limited Setback Waiver Text Amendment Simple Subdivision Other: $505.00 (Ph 1) PLEASE TYPE OR PRINT LEGIBLY IN INK Property Owner(s): John W. Herrin Phone: 563-556-1421 Address: 13668 Surrey Lane City: Dubuque State: Iowa Zip: 52001 Fax Number: Mobile/Cellular Number: Applicant/Agent: Buesin~ & Associates Phone: 563-556-4389 Address: 1212 Locust Street City: Dubuque State: Iowa Zip: 52001 Fax Number: 563-556-6717 Mobile/Cellular Number: Site location/address: Derbv Grange Road Existing zoning: C-3/R-2 _ Proposed zoning: C-3/R-2 Historic district: Landmark: Legal description (Bidwell Parcel ID number or lot number/block number/subdivision): #1008351001, #1008376005,#1008451005,#1008451003 Total property (lot) area (square feet or acres)0120.07 Ac.) Phase 1 - 27.90 Net Ac. Number of lots: 62 Total (5 Commercial Lots & 57 Residential Lots) Describe proposal and reason necessary (attach a letter of explanation, if needed): Proposed commercial and residential development CERTIFICATION: I/we, the undersigned, do hereby certify that: The information submitted herein is true and correct to the best of my/our knowledge and upon submittal becomes public record; Fees are not refundable nd pay ent does n guarantee approval; and All additional require ritten graphic rr serials are attached. Property Owner(s): Applicant/Agent: _ Date; Date: FOR OFFICE USE O LY - AP CAT_ ION SUBMITTAL CHECKLIST Fee:~,~~ BOO, Oo Received by: ' /, Date: 7 ' Z ' ~ 7 Docket: Site/sketch plan Conceptual development plan Photo Plat Improvement plans Design review project description Floor Plan Other: IJ CP (4w JAYI tbr. C]Anr :.XI7-]•x41 PRELIMINARY PLAT -MAJOR SITE PLAN SERENITY RIDGE SUBDIVISION, DUBUQUE, IOWA Comprsfld oL• The 5W1/4 SWi/a, Section 8, T89N, R2E; Lot ! 3 Lot 3 of Elutlers Hdl Second AddItKM: and Lot 14 of the SW 1/4 SE 1/4. Section 8. T89N, R2E, 1II located in Dubuque County, Iowa LOr I2 a ORIEErRIp .U31PN N 1 Oel A IIDtp I*511 DIIIE(Op11W 1O :.UH10:le, N 5AD] vARCEI / 1001]0]001 tnV COMER •'OIINO EC CGYSERYANCY iWl// SWIH 3EC 1. T11N. RX LURUOIIE LIYI/M A 1 I~ / ~/ i" ~~ ~. OF :oT71 aoaleRr(e!1 L'IQp(L A RNtl6S 'unxREralNpetip ~YIeW111.N5L002 i 'MClL 1100g0]OOt Yv101'C '. ~. 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'• 0 n0 ,IC1101 .: Q•Y nf..1• Ik I:IA f.R ~ >•I~ J !• ~ 1 ^ .~ ~ ,~ r ., ,:.rant <w a •,.. .• __.,t i ~i vn,,UIfN L.I ~ W ~ VI17 ! ~/~1J ( ~ ~L/ y'~~..I ~•, _........_ ~ , ' J~ i I: I ~ I:nxwle ,. • ,. own• rrura ow• o onn f I 1 r~1 ^ n ,••nlr onrY -.FTEJnGK FC..::~ES:'..'YTS i a ; } 7.•7 Y1A ,Y•p I wnl In M.~.~ . ~•1• a wwrwr v,:ao•, ~~ __ _ r.u aowr.• •r Inln rap I er J I ~ Prepared .or: ~~ Preliminar Pia - Il ~ ~ •• -~"' ~]' •~~_.....-.:-~= ^n xa:.. ~ ,c~^ .~ coo-. ~~- ~ Pif Srl~i~/ I ~/ t '~a~ln' Slt© Pli:i I :~ ~ ~ r. ~°,,;/ ~ Or•.~ ~' Y, i .. nl ~ _ =. Jahn W. Jo Her•ig ,..:.tf, `"'d'~ !e1ri,IGNS "a A5SOCIATES INC. L.E: '.`, NI,lIN ~ '~ 1 ^658 Surrey Lane, Dubuque, Iowa ~ (tea h\ ,, r.•vr.;,vE•I:.rS .!„n .,•rlrvernrts _....._~.. ___ _.... _. _ ~ ~ r / Granne Read, Duu++ry_ u~, Icf/a ~ . I, ..'I~,~ ' _: ,:, i i;'aawrl i,Y_rr,D WLUI,'.M,1 rl',;M.•113[~11na~,M1 L•~~,,.l Al•':O'1/.^I7y' PRELIMINARY PLAT -MAJOR SITE PLAN SERENITY RIDGE SUBDIVISION, DUBUQUE, IOWA I III 101 teq 6MfN11RNNe11S'ry IOI t4ry 0fllIIA1Nl'll '- ~- e1FVF G ItfBCIMA4r ~ I I . li iJ191 DFRel'OMNGI RIt ... _ _. .. Dueu0ut.N520o' NN'coMIR G LIFT STATION N4 ' i I ~ PAnL:[~uron2eoe: efL si~ileoN a~ i ^ H - DfRRYGHANGf ROAp r _ (BY DEVELOPER ,, ' 11, itrwG pa Aowculurl IN PHASE III ~II IA Id alp' _ - fY1S1OK,Hrwe,rc tccaimmaanu,., 1019 - '.I 1 . '~... '~i eTIMM WARfl -~ W117 t1flWTKni A181 1011'• ~ I 1011~i Q tO1M i~ 1014 .1018 LO77 ,COTE _ LO1S 1 "1O1i ~' [OIJ _ f0l 117 - ~ [[~~ A \ VINIrv tl i6eW 81 '~ 4. 11eW 5' IIeOG ~~ I ~~ l0 + ~ ~ 1JIU 51 ' , - ~.. w 97168. 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P101 q'ON.u' i m"P'uc J 6 UfT STATION N7 i I ~ I j I BY CITY OF DUBUOUC Ina p ApA1P Iucwull,m~ .. ~ I , I 1 _r.F'1[N __ LFfiAi DESCR7PIION QY71~ __~~__. ADDIICS!: -__.. PARLt' ':IYNIa'..- ZP::I.r I I A LU IB Or IIOOOW)OR EOIATES TN1RD ADOI110N TRnI a LE INmL a JAGLM N. LOMILY e00U lWN vAr-I ~t w DU6UDUl. lA D7GD: iW7O 1001 000 Cit P-_- P LOt 10 Or MOOOIIDOR feTA7E9 TTIIRO AODITI01; JFFFRFr C. 6 -AVLr. J. OOCRIN)*F[N 1141 NIIIAINO11fl0 UN OlIRUOUI'., SA D9007 1007177IgJ 000 CTY R 2 I L l0T 17 OF ROOOIIOOR IeTATFB TNIRO ADDITI011 KEVIN R. a C. RFNFF /O-Pr IIIR7 IIOOOIIDOR OR OUM10Ul, IA D?009 /007/77001 ORO CTY R D l0T 10 0/ IIOOOYOOR f81ATE8 7NIRU A001 T10N Jf 7FRCY D. a RAf.NFI M. KLl1GP 11117 ^00011DOR OR 01MIW'JC, JA 0.^00: 10071770[15 000 CTY K.7 F 101 /? Or 11O00110M1 EBTAlCS TNIRU A0011ION eloooNOON CORPORAr)(r, 11700 RTMR -A45 UIIOllOUC, IA 6900: 10071770(14 000 CTY R-9 I LOi tU Or Md10000R E8TATES TNIRD ADDITION KOOONOON CMiPOPA+10'. 11700 11MN PAS! OUe110U1, IA 0100: 100//77011 000 L1Y P 1 G LO1 ? Or t11! N1/! tlNt/1, Bt L. 0, TBNN R:: J[NM a. l 6Al.l ': JU I:: irll, ii I: T,C 6URRfv L': RMW1N, 1 IA S90n" IOfN'J9000'• CI7Y Or 000 R 7 ; i N I::• 7 OI U„ N:. t; .t 9. 11 ~, BFL. D, 7e4N P9f OA wlr 14 AMOtt /' 4 GAr'AU. iJIR4 Or KMY ORAN01 AU DUWgi:l, fA D1W:' 100//07001 ORO LTY A I +_. __ _ t y, RVA . y. 11• J7Pr Y, -J1 I.h - .,. 1 ,•. .. .r e'slr' a:. x'... - 6uex lnura eN.w- ~..,,~ .. I'LA7l~ [ fil~T T YF'Ir AI f C' I'd. . n' L r STRFC 7 Il'HIC,nL Sr C7;<)y 3r 8f?C ro no- r era: ,,: ~. ,~, , ._. I., Ka; ~ [1 c :.-51;< iJ i Preparedtrr' ~ Pf:Jlll711'iAi Y ~,'i r "l~OF .;1:, I~I1'tl I ~~ ~ '~a~;~ '{ A 24.Y.A7 r CfiOT~ ~' I Johl1 W. 8L Sally Jo Hcrri~ '-' z ~~ „; N i - ~ _._..___~.___._ ~~ ASSOCIATES INC. 13663 Surrey pane. Uubuglae, lain/.a ~`~_ ~ ~ - - I e•.~'ctat1.kN n.n'n sriRVernn..t --~- ~- (._____ ._..._ ._,._...__.__. _...._.._. __._. ._ __DerbyG~~,~ne Ro~1c , Dubu~~~:.1 Iowa I . 1 :1 111 . , r __ ~_. cL~ .`.. _TCO _ K COIIMI II eWIN SL IN - 6fCe, te1N R:I : THE CITY OF DUB JE Masterpiece on the Mississippi Vicinity Map Applicant: John Herrig Location: South of Derby Grange Road Description: Preliminary Plat Serenity Ridge Subdivision Legend City Zoning Boundary Proposed Area to be Platted 0 City of Asbury Planning ServicesNicinity Maps\ZAC\Preliminary Plat Serenity Ridge (Herrig) 04_25_07 SUBDIVISION STAFF REPORT Zoning Agenda: May 2, 2007 Project Name: Preliminary Plat Serenity Ridge Subdivision Property Owner: John W. Herrig Applicant: Buesing & Associates Number of Lots: 142 Acreage in R.O.W: 10 acres Total Area: 112 acres In City: Yes In 2-Mile Area: N/A Flood Plain: Yes Density Allowed: 1 per 5,000 Commonly owned lots: None Sanitary Sewer: Yes Water: Yes Storm Sewer: No Existing Street Access: Yes Proposed Land Use: Residential Proposed Zoning: AG/R-2/C-3 Existing Land Use: Vacant Existing Zoning: AG/R-2/C-3 Adjacent Land Use: North -Residential Adjacent Zoning: North - A-1 Agricultural East -Agricultural East - A-1 Agricultural South - Vacant/Agricultural South -Planned Commercial/A1 West -Residential West - R-2 Single-Family Physical Characteristics: The subject property is located in the northwest corner of the City of Dubuque. The property generally drains to the southeast and will be served by the proposed extension of Plaza Drive that will connect to Derby Grange Road. Proposed Phasing: Two phases are proposed-Phase 1 includes 62 total lots. Previous Conditions of Zoning or Plats: None. Dedication of Open Space or Public Amenities: The applicant is proposing to dedicate Lot F as a public park. The property is comprised of 9,187 square feet and is included in Phase 2 of the subdivision. Proposed Streets and Grades: Plaza Drive-2.9% to 8%; Serenity Drive-3% to 11 %; Tranquility Drive-8%; Serendipity Drive - 2.8% to 8%; Trinity Drive-1.5% to 8%. Recommended Motion: Motion to table the Preliminary Plat of Serenity Ridge Subdivision as the proposed Plaza Drive intersection with Derby Grange Road does not meet AASHTO standards for site distance based on roadway speeds. Conformance with Comprehensive Plan: The 2030 Future Land Use Map designates this property for single-family residential and commercial land uses. This proposal implements the Comprehensive Plan Land Use Elements: 1.2, 1.5, 4.3, 7.1 and 7.2. Subdivision Staff Report -Preliminary Plat Serenity Ridge Subdivision Page 2 Impact of Request on: Utilities: City water is being extended to the site through Asbury Plaza Business Park which is being developed by Motor City LLC. The water main will be extended along Plaza Drive from the south. City sanitary sewer service is being provided as part of the Asbury Plaza Area Wastewater Pumping Facilities 2007 project. This project will provide the necessary infrastructure to serve both the Serenity Ridge Subdivision as well as Asbury Plaza Business Park. Traffic Patterns: The subject subdivision will be served by an extension of Plaza Drive, a collector street, that currently intersects with the Northwest Arterial near Red Robin Restaurant and Premier Bank. There are no traffic counts available for Plaza Drive. The subdivision also will be served by the intersection of Plaza Drive and Derby Grange Road. Based on 2005 IDOT traffic counts, there are approximately 610 vehicle trips per day on Derby Grange Road. Public Services: Existing public services are adequate to serve the subdivision. Environment: Staff does not anticipate any significant adverse impacts to the environment provided adequate erosion control is provided during all phases of grading and development of the subdivision. Prior to grading, permits from both the State of Iowa and City of Dubuque are required. In addition, a city inspector will inspect the property for compliance with erosion control requirements. Adjacent Properties: The most likely impact to adjacent property will be an increase in vehicle trips on Derby Grange Road and Plaza Drive as well as a change in the ambient light level as the subdivision is built out with new single- family homes. Recommended Conditions on Plat: None. Staff Analysis: The submitted Preliminary Plat of Serenity Ridge Subdivision is located in the northwest quadrant of the City of Dubuque. The proposed subdivision will be served by an extension of Plaza Drive that will intersect with Derby Grange Road west of the Derby Grange Recreation Center. The total property involved in this subdivision is 112 acres, approximately 65 of the acres will be subdivided into residential and commercial lots divided into two phases. Phase 1 is comprised of 57 lots zoned R-2 Two-Family Residential District and 5 lots zoned C-3 General Commercial District. Four of the five commercial lots are located on the east side of the proposed extension of Plaza Drive and one lot is located at the southwest comer of Plaza Drive and Derby Grange Road. The subdivision will be served by four new public streets built to the City's residential street standard of 31 feet of paving within a 50 foot right-of--way and an extension of Plaza Drive built to the City's collector street standard of 37 feet of paving within a 60 Subdivision Staff Report -Preliminary Plat Serenity Ridge Subdivision Page 3 foot right-of--way. Plaza Drive is proposed to be expanded to 41 feet of paving from Serenity Drive north to Derby Grange Road to allow for an additional turn lane in the future. The extension of Plaza Drive and its intersection with Derby Grange Road will provide two ways to get to the subdivision from either Derby Grange Road or the Northwest Arterial; however, within the subdivision itself, there are 80 lots served by a single access-Serenity Drive. Planning Staff requested that the applicant investigate obtaining a secondary access to Derby Grange Road from Serenity Drive, however, the applicant indicated that was not feasible because of the ownership situation. The other unresolved street issue is that the proposed intersection of Plaza Drive and Derby Grange Road does not meet site distance requirements for the actual speed of travel on Derby Grange Road. The speed limit posted near the proposed intersection of Plaza Drive and Derby Grange Road is 35 miles per hour; however, a recent speed study conducted by the City Engineering Department indicated that the 85 percentile speed on Derby Grange Road was closer to 52 miles per hour. Based on AASHTO standards, 540 feet of site visibility should be provided where only 370 feet is available. Alternatives discussed between Engineering and the applicant include lowering the height of Derby Grange Road, installing an additional through lane, creating athree- way stop sign controlled intersection and relocating the Plaza Drive/Derby Grange Road intersection to the east or west. The City Engineering Department will provide a memorandum outlining their concerns to the Zoning Advisory Commission but will mail it separately from the meeting packet. The applicant believes the required improvements are outside the scope of his proposed development. The applicant also has indicated that he does not have control over the speed of travel on Derby Grange Road and that there is a very low volume of traffic on the roadway. The subject subdivision will be served by City sanitary sewer facilities as well as City water. City water will be extended along Plaza Drive through Asbury Plaza Business Park to a point that the developer can extend into his proposed subdivision. Sanitary sewer service will be provided to the proposed subdivision as part of the Asbury Plaza Area Wastewater Pumping Facilities 2007 project. This project entails the construction of up to four lift stations and force mains to serve both the proposed Serenity Ridge Subdivision as well as the Asbury Plaza Business Park. The developer is proposing to donate amini-park to the City as part of Phase 2 that would encompass approximately 9,000 square feet. The Leisure Services Department will review the proposed donation of land to see if there is sufficient area to accommodate the City's typical play area for amini-park. The subdivision also includes two lots, Lots 8 and 9, Block 3, in Phase 1 that will likely need setback variances in order to build residential structures on them. The size and shape of the lots are partially dictated by the topography of the site. Subdivision Staff Report -Preliminary Plat Serenity Ridge Subdivision Page 4 As part of Phase 1, Lot A is platted specifically to provide access to the 8 acre Butler parcel in the middle of the subdivision. This access can be upgraded to a City street if the Butlers, or future owners of the parcel, wish to further subdivide the property into building lots. The 50 foot width of the lot provides sufficient right-of--way for the extension of a future City street. Because of the lack of site visibility at the intersection of Plaza Drive and Derby Grange Road and based on the recommendation by the City Engineering Department, Planning Services staff recommends that the Zoning Advisory Commission table the submitted preliminary plat with the applicant's concurrence to a future meeting to allow more time to work out the intersection issues associated with this subdivision. The commission will not meet again before the 60-day time limit for reviewing preliminary plats expires. If the Commission does not make a recommendation before the 60 day time limit expires, the plat is automatically approved. Prepared by: / Reviewed: rl,19 Date: yZ6 'D7 Attachments F:\USERSVCmunson\WP16oards-Commissions\ZAC1Staff ReportslFinal Plat Serenity Ridge Subdivision (Herrig).doc THE CITY OF DuB E MEMORANDUM ~-~-~ April 27, 2007 TO: Laura Carstens, City Planner FROM: Gus Psihoyos, City Engineer SUBJECT: Serenity Ridge Subdivision INTRODUCTION This memo is in regard to the proposed intersection of Derby Grange Road with the extension of Plaza Dr. BACKGROUND The City Engineering Department has reviewed the Ridge dated March 26, 2007 as proposed by Engineering requested the developer to provide order to evaluate the design. DISCUSSION Preliminary Plat for Serenity the developer John Herrig. side distance information in A speed study was done by ECIA this April on Derby Grange Road near the proposed intersection which determined the 85th percentile speeds to be between 52 and 55 mph. The posted speed limit is 35 mph at the proposed intersection. Based on a survey by Buesing and Associates, the existing stopping sight distance is 370 feet. According to the American Association of Highway and Transportation Officials (AASHTO) guidelines the recommended sight distance for 50 mph is 555 feet. County Engineer, Mike Felderman has indicated that the former owner of the property applied for a driveway permit for this proposed area and it was denied because it did not meet the county's sight distance and access requirement. According to a 28E agreement with the County, they have jurisdiction for Derby Grange Road. The County Engineer requested that the consultant verify that the intersection meets the county's requirement prior to them approving the plan. RECOMMENDATION The Engineering Department recommends that the developer's Engineer re- evaluate this intersection -location and geometric design to meet the AASHTO standards. Ron Turner, PLS Jon Dienst, PE Kyle Kritz, Assistant Planner Bill Schlickman Planning Services Department City Hall 50 West 13~ Street Dubuque, IA 52001-4864 (563) 589-4210 phone (563) 589-4221 fax (563) 690-6678 TDD planningecityof dubuque. orQ THE CITY OF DUB E Masterpiece on the Mississippi June 18, 2007 The Honorable Mayor and City Council Members City of Dubuque City Hall - 50 W. 13th Street Dubuque IA 52001 Applicant: John Herrig Location: Derby Grange Road Description: Preliminary Plat of Serenity Ridge Subdivision Dear Mayor and City Council Members: The City of Dubuque Zoning Advisory Commission has reviewed the above-cited request. The application, staff report and related materials are attached for your review. Discussion The applicant spoke in favor of the request reviewing traffic and roadway issues, reducing the speed limit on Derby Grange Road and traffic study conducted by Business and Associates. Ken Buesing, Buesing 8~ Associates, representing John Herrig, discussed his firm's traffic study and information submitted by HDR, Inc. Staff reviewed traffic analyses regarding Derby Grange Road, and the attached information submitted by Gus Psihoyos, City Engineer, regarding the proposed intersection of Derby Grange Road and Plaza Dive, and information supplied by HDR, Inc. on behalf of the City of Dubuque. There were no public comments. The Zoning Advisory Commission discussed the request, reviewing issues with the proposed intersection of Derby Grange Road and Plaza Drive, whether a second access needs to be provided to Phase II of Serenity Ridge Subdivision, and the provision of a park in Phase I in addition to the park proposed in Phase II. Recommendation By a vote of 5 to 0 the Zoning Advisory Commission approved the preliminary plat subject to the following conditions: Approval is contingent upon resolution of the intersection improvements for Plaza Drive and Derby Grange Road; 2. That the Zoning Advisory Commission review the final plat for Phase 1 of the subdivision; 3. That a second access be provided for Phase 2 of the subdivision and the final plat for Phase 2 be submitted to the Zoning Advisory Commission; and Service People Integrity Responsibility Innovation Preliminary Plat of Serenity Ridge Subdivision Page 2 4. That dedicated park area of similar size to the park area proposed in Phase 2 be provided in Phase 1. A simple majority vote is needed for the City Council to approve the request. Respectfully submitted, ~. Eugene Bird Jr., Chairperson Zoning Advisory Commission Attachments cc: Gus Psihoyos, City Engineer Gil Spence, Leisure Services Manager F:\USERS1Kmunson\WP\City CounCillCC 07_02_071Herrig Preliminary Plat of Serenity Ridge\Plat of Serenity Ridge (Herrig) cc Itr.doc THE CITY OF DUB E MEMORANDUM Masterpiece on the Mississippi DATE: May 31, 2007 TO: Zoning Advisory Commission FROM: Kyle L. Kritz, Associate Planner ,~ ~ x RE: Preliminary Plat of Serenity Ridge Subdivision Background The Zoning Advisory Commission tabled the proposed Preliminary Plat of Serenity Ridge Subdivision from its May 2, 2007 meeting to its June 6, 2007 commission meeting. The applicant, John Herrig, requested that the Commission table his request based on concerns raised by City staff regarding the intersection of Plaza Drive and Derby Grange Road. Discussion The Zoning Advisory Commission agreed to table the proposed Preliminary Plat of Serenity Ridge Subdivision to allow more time for the applicant and City staff to discuss alternatives for providing a safe intersection where Plaza Drive is proposed to intersect Derby Grange Road. Subsequent to the May 2, 2007 Zoning Advisory Commission meeting, Buesing ~ Associates evaluated the proposed intersection of Plaza Drive and Derby Grange Road in terms of alternatives to increase the site distance available to motorists. City Engineer, Gus Psihoyos, also contacted HDR Engineering Inc. to review the proposed intersection of Plaza Drive and Derby Grange Road. Based on the analysis provided by Buesing & Associates and HDR Engineering Inc., Gus Psihoyos, City Engineer, has provided the attached memorandum that outlines the City Engineering Department's position on the proposed intersection of Plaza Drive and Derby Grange Road. Recommendation Planning staff recommends that the Zoning Advisory Commission review the attached information. Planning staff cannot recommend approval of the Preliminary Plat of Serenity Ridge until the issues associated with the intersection of Plaza Drive and Derby Grange Road is resolved. Attachment F:\USERSUCmunsonlVVP\Boards-CommissionslZAC\Staff Reports\Preliminary Plat of Serenity Ridge Sub 05_30_07.doc THE CITY OF ~~~,. DU-...,,8 ~\,,, E Masterpiece on ttze Missrssi~~i MEMORANDUM May 31, 2007 TO: Kyle Kritz, Associate Planner FROM: Gus Psihoyos, City Engineer SUBJECT: Serenity Ridge -Plaza Drive Intersection BACKGROUND This is a follow-up to discussions with Buesing and Associates and HDR regarding the design criteria for the proposed intersection of the extension of Plaza Drive with Derby Grange Road just west of Herod Lane as shown on the preliminary plat of Serenity Ridge. The posted speed limit at the proposed intersection is 35 mph. The 85th percentile speed is between 52 and 55 mph. DISCUSSION Buesing and Associates evaluated the existing vertical alignment of Derby Grange Road and determined the roadway would have to be lowered up to 6.5 feet to meet the design requirements for an intersection in a 45 mph zone. The grading for this design was estimated at over 8000 cubic yards with 1500 feet of roadway to be rebuilt. Another option of adding a left turn lane at the proposed intersection was not warranted by existing traffic counts and would not sufficiently increase safety if the sight distance issue was not resolved. Buesing and Associates recommended traffic calming devices such as flashing beacons, etc. to lower the 85th percentile speed. Since City Engineering was not comfortable with Buesing and Associates recommendations, we forwarded the Buesing and Associates plans and profile to HDR for further review. HDR agreed the roadway should be designed for 45 mph and recommended two options. One option was to lower the roadway to meet sight distance requirements for the proposed intersection. The other option was to relocate the intersection across from Herod Lane. (Relocating the intersection involves a third party not associated with the proposed development). RECOMMENDATION Based on the above analysis by Buesing and Associates and HDR, City Engineering recommends that a design speed of 45 mph be established for intersection sight distance for this portion of Derby Grange Road. This will involve the regrading of the roadway or relocation of the intersection to meet the sight distance requirements. 1C?'~ I ONE COMPANY J[ZII.` Msny Sol~tioni'" Memo to: Gus Psihoyos, P.E. City of Dubuque From: Chris Malmberg, P.E. Project: William Sharp, P.E. cc: Date: 5/29/07 dob No: RE: Derby Grange Road /Plaza Drive Intersection Per request from the City, an independent review was conducted for the proposed intersection at Derby Grange Road and Plaza Drive. The City provided background information, including a memorandum from Buesing & Associates (dated May 18, 2007), with several attachments including the existing plan and profile of Derby Grange Road. The City noted concerns with intersection sight distance of the proposed intersection, considering the observed 85~' percentile speed on Derby Grange Road of 53 MPH to 54 MPH. HDR reestablished the existing vertical geometry provided by the City to evaluate the sight distance that would be provided assuming no vertical improvements on Derby Grange Road. The existing sight distances are noted below. Existing Conditions at the Proposed Plaza Drive Intersection with Derby Grange Road - • Derby Grange Road Stopping Sight Distance - 370' • Plaza Drive Intersection Sight Distance - 420' • Derby Grange Road Decision Sight Distance - 370' (note -Buesing & Associates Memo reported 422' for decision sight distance. Per the 2004, AASHTO Green Book, the eye height is 3.5' and the object height is 2.0' for stopping and decision sight distance.) Based on the existing Derby Grange Road horizontal and vertical alignment information provided, it appears that the existing design provides a 45 mph design speed. Traffic Projections As part of this review, we were not provided the opportunity to review the proposed traffic projections for this development. One thing that should be considered is that the proposed Plaza Drive intersection on Derby Grange Road has the high potential to change the traffic patterns on Derby Grange Road. Plaza Drive will create acut-through location for Derby Grange Road traffic from the west that want to access the Northwest Arterial. This potential cut-though traffic should be considered in the capacity analysis. Speed Limit Considering the large difference between the posted speed limit and the design speed, we would suggest follow-up with the Dubuque County Engineer. The posted speed limit is puzzling given the horizontal and vertical geometry provided on Derby Grange Road and given that this is a rural undeveloped area. The actual 85 percentile speed is well above the design speed of Derby Grange Road, and enhanced enforcement or traffic calming measures should be considered in this area. Proposed Intersection Location - No Derby Grange Road Improvements The proposed location of the Plaza Drive intersection is west of a substantial crest vertical curve, with an instantaneous grade of 7.4% on Derby Grange Road. Due to the location of the intersection relative to the vertical curve, a reduced design speed is provided unless the vertical alignment on Derby Grange Road is improved. The available intersection sight distance is nearly adequate for 40 mph (15' less than criteria) and the decision sight distance (for a stop on a rural road) for the proposed location provides a design speed of 40 mph. Considering this will be a public street intersection, HDR is concerned about the intersection and decision sight distance provided at the proposed intersection location. Our opinion is that the existing design speed on HDR Engineering, Inc. 8404 Indian Hills Drive Phone (402) 399-1000 I Page 1 of 2 Omaha, NE 68114-4098 Fax (402) 399-0979 www.hdrinc.com Derby Grange Road of 45 mph should be required for intersection sight distance at this new intersection. Additionally, the intersection would be located on a 7.4% grade, effecting acceleration /deceleration and wintertime operations. Noted below are several design options that can be considered to mitigate some or all these concerns. Design Option 1 -Derby Grange Road Vertical Alignment Improvements As noted in the Buesing & Associates Memo, an option was investigated to improve the intersection and decision sight distance on Derby Grange Road by increasing the vertical curve length from 900' to 1320'. This design option would meet a 45 mph design speed for intersection and stopping sight distance, and flatten the grade at this intersection. In our opinion, this would be a viable option because it provides fora 45 mph design speed. Design Option 2 -Provide the Proposed Plaza Drive Intersection at Herod Lane This option would provide a proposed intersection opposite Herod Lane. This location is near the crest of the existing Derby Grange Road vertical curve, improving visibility for all legs of the intersection. This location would provide a 45 mph intersection sight distance without modifications to the existing geometry, and would eliminate the 500' offset intersections in Design Option 1. We understand the developer does not own the property south of Herod Lane. With this option, we would recommend the developer build a portion of Plaza Drive that would be compatible with a future connection across from Herod Drive. This connection would be planned in the future as the area to the east develops. With this option, no access to Derby Grange Road would be provided with the proposed development. Design Option 3 -Addition of a Derby Grange Road Left-Turn /Bypass Lane As noted in the Buesing & Associates Memo, an option was also investigated to provide alert-turn lane and bypass lane on Derby Grange Road. As noted by Buesing & Associates, the projected left-turn volume at this intersection would not warrant alert-turn lane (per AASHTO Exhibit 9-75). Our opinion is that the left-turn lane would help mitigate the lack of decision sight distance for westbound traffic. However, this option would not mitigate the substandard intersection sight distance for northbound Plaza Drive traffic turning left onto Derby Grange Road. Summary In summary, it is our opinion that the intersection sight distance provided for the proposed intersection should provide for a design speed of 45 mph (similar to existing conditions). Design Options 1 and 2 would fully meet this criteria. HDR Engineering, Inc. 8404 Indian Hills Drive Phone (402) 399-1000 Page 2 of 2 Omaha, NE 68114-4098 Fax (402) 399-4979 www.hdrinc.com Buesing & Associates 1212 Locust Street Dutwque, lA 52001 Phone 556-4389 Fax 556-6717 Memorandum Project nlo. 0711 s Ta Gus Psihoyos, Ron Tumer, -Bob Schierl, Kyle Kritz, Mike Fekierman 8 John Hemg Frw~ Tom Olthafer . CG Ken Buesing Defuse Tuesday, May 18, 2007 R~ Plaza Drive/Derby Grange Intersection ECIA conducted a traffic count/speed study on portions of Derby G .range Road at three locations. Concern for a safe intersection (maintaining the existing >~raffic speed) has prompted a discussion of geometric design improvemerrts to Derby] Grange Road. Adherence to a selected improvement has, up to this time, been a prerequisite to the approval of John Herrig's preliminary plat of Serenity Ridge Subdivision and the extension of Plaza Drive. The following is a summary of the traffic speed stu~y. Location near JFK EB near JFK WB near future Plaza Drive EB near future Plaza Drive WB r~r Hales MiN Rd EB near ales Mill Rd AADT 573 628 361 410 28B 363 Peak Volume 13 15 5 5 4 4 A .S 47 50 44 45 42 46 Posted Limit 45 45 35 35 35 35 o Exceeding Pasted S 64.2 77.0 83.7 83.2 87.3 95.6 Exoeedilg 55 m 11.1 21.8 8.94 12.60 2.05 6.74 P 53.87 57.96 52.72 54.43 48.43 52.00 °k Cars 98.80 98.40 98.10 97.60 98.30 97.60 % SmaY Tnx:ks 1.00 120 1.90 1.20 1.40 1.90 % Tn~lcs/Busses 0.20 0.30 0.00 0.70 0.00 0.30 Two design options were identified in a meeting on Motxiay, May 7, 2007; • 1) Re-grading the vertical curve on Derby Grange to increase the sight distance and, • 2) Construct a left turn lanelpassing lane for the entrance onto Plaza Drive. The existing conditions of Derby Grange Road, when classif~d as a rural road, meet the design requirements of a 40 mph design speed. The intersection sight distance is deficit by 13 feet More design criteria become non-compliant when a 45 mph design speed is considered. G:~07\118~doc407118-02memo.doc Project Memorandum, Page 2 Existing Conditions: Grades 10.10% & 4.39% K = 63.48 Vertical curve length = 920 feet Stopping sight distance = 370 feet Intersection sight distance = 422 feet Decision sight distance = 422 feet Design Speed, Conditions: 40 mph 8 % max 44 (determine 305/336* 445 363*/660* 45 mph 6 % max 61 :d by K value) 360/396* 500 435*R43* "adjusted for approach grade Decision sight distance A/C Avoidance maneuver A: stop on rural road Avoidance maneuver C: speed/path direction change on rural road Intersection sight distance is not adjustied for grade per AASI-~TO,.Exhibit 9-55. Design Intersection Sight Distance -Case 61- Left Tum fronh Stop. i Prior to proceeding with an in-depth: study of the options, a preliminary profile was evaluated to approximate the cut necessary to achieve the design goals of a 45mph design speed. To achieve an intersection. sight distance of 500 feet, Derby Grange would require inc;neasing the present 920 foot vertical curve to 1,300 feet and cuts up to 7 feet. The grade at Herod Lane would need to be lowered almost 4 feet and the grade at the Plaza Drive intersection would lower over 6 feet Additional grading of Herod Lane would be requirexl to achieve an acceptable approach grade. Without doing any further design, it became obvious that this option would be extremely cost ineffective. Plan and profile sheets. showing existing and potential curves are attadied. Widening of Derby Grange at the Plaza Drive intersection for a left tum lane ~s also an ineffective solution. Existing traffic volumes do not warrant a left tum lane. -See AASHTO Exhibit 9-75.Guide for Left Tum Lanes on Two-Lane Highways. An alternative to a left turn lane is a Tee Intersection Bypass Lane typically used by the W~sc;ortsin DOT. The bypass lane allows a through vehicle to bypass a ieft~uming vehicle that is stopped in the traffic lane. An intersection that redirects the through traffic brings in-to-play additional avoidance maneuvers that n~uire increased sight distance. In-effect, a turn lane or a bypass lane would also require re-grading the vertical curve mentioned above. Acxording to SUDAS urban design criteria, Derby Grange Road cxauld be classified as a two lane minor arterial or a major collector (granting a variance for grades). Design criteria does not warrant geometric improvemerrts to the roadway. The advanced traffic speed of the 85~' percentile is not an indicator to increase the design speed, but rather an indicator of the necessity of su'dable traffic control devices to achieve a safe vehicle speed. Designing a segment of the roadway with a greater design speed will only promote increased traffic speed and a greater danger at other points abng Derby Grange. Project Memorandum, Page 3 Traffic volumes, vertical gradients, horizontal and vertical curves, one-lane bridges, and density of access points all dictate the need for a slower traffic speed and solutions that are economically feasible. Summary: • A traffic study that reports an 85~' percentile traffic speed of over 50 mph on a roadway presently posted at 35 mph has prompted the consideration of measures that would provide a safer intersection. • Regrading the vertical curare on Derby. Grange-Road to achieve a 500 foot sight distance would lower the Plaza Drive intersection about 6.$' and the Herod Lane intersection about 4,0'. Excavation of over 8,000 cubic yard of earth, and 1,500 linear feet of pavement would be cost prohibitive. • Construction of a left tum lane or a tee intersection bypass lane is; o Not warranted by existing traffic volumes o Would not incxease safety unless sight distance was also increased • Geometric improvements to meet the requirements of faster design speed at the Plaza Drive Intersection increases the danger at other cor~ict points on Derby Grange Road. • Traffic calming and .control devices would increase the safety at all points on -Derby Grange Road. __ Recommendations: • Serious consideration should be given to the use. of suitable traffic control devices to lower the 85~' peroentile traffic speed. • The dty of Dubuque and Dubuque Coun#y develop a cooperative agreement to initiate and implement a unifom~ traffic control policy. • Traffic control devices could indude: o high visibility advanced warring signs o flashing beacons (such as those used in school zones) o Speed Zone Ahead and/or Reduced Speed Ahead signs o Intersection signs in combination with name of side road o Radar operated speed displays (mobile or mounted) o Converging d~evron pavement marking -- ---------References: SUDAS Chapter 5: Roadway Design AASHTO Chapter 3, Decision Sight Distance, Exhibit 3-3 AASHTO Chapter 9, Intersection Control, Exhibit 9-55, Exhibit 9-75 ATSSA: Low Cost Local Road Safety Solutions w 0 O t0 a C! THROUGH HCHNAY THROUGH HCFIWAY - - - - - 0- - - - - - - - - ~~- --• ~- ~~-~ 2NX7 fITYPE B21 ~ -"I b~ w.- ~ * ~ H)0' R2 i3 3' I ~ K%1 TAPER THS CONTROL LNE IS ESTABLISHED BY A 10:1 TAPER EXTENDED FROM TIE BACK OF THE CURB END LOCATED FARTHEST FROM THE THiOI%IH HfAIWAY, TYPE "Bt" AND "B2" GENERAL NOTES DESIGNS NAY BE USED WTERCHANCEABLY IN COM611ATpN OR SEPARATELY FOR ANY ONE COMW~LETE NTERSECTN)N DEPENDING UPON NTERSECTION ANGLE AND SURFACNIG OF EACH APPROACH ROADWAY. SIDE ROAD SIXiFApNO NOTE WHEN THE SqE ROAD IS NOT PRESENTLY PAYED, PAVEMENT SHALL ~ PLACED TO THE LANTS SHOWN UNLESS OTHERWISE PROVgED Ri TIE CONTRACT. WHERE THE CONSTRUCTION LIMITS ARE BEYOND THE PAVNIG LWATS, CRUSHED AGGREGATE SURFACING SHALL BE PLACED BETWEEN TIE PAVING lAWTS AND CONSTRUCTION LAWTS. WHEN THE SqE ROAD IS PRESENTLY PAVED, NEW PAVEMENT SHALL BE PLACED TO THE LAl1T5 OF DESN21 AS SHOWN AND BEYOND, E NECESSARY, TO MEET EXISTING PAVEMENT. NHEN THE SqE ROAD IS THE CONSTRUCTION PROJECT, iIE NTERSECTION SURFACING SHALL BE THE SAME AS FOA THE PROJECT, ®EXISTNG SURFACE 15w -~ ., *CONCRETE CURB A GUTTER 36'. TAPER CURB FEIGHT N = $IN1UlDER WX1TH R2~ ~~ 0` i0 6' d1 10'•0' LENGTH AT ENDS OF CURB 6 CUTTER OR 5• MAr, 1 SECTNINS. WIEN SPECIFIED ELSEWHERE Xi THE CONTRACT, PROVDE CURB OPENXiC AND FLIAE. Ql b' TYPICAL pADI DMENSN)NS FOR TYPES '8t, -82', 'C' AND -D' NTERSECTIONS t0:1 TAPER Q2 D?' (TYPE BU Ir ITTPE 821E%CEPi ON RESIAN'ACNiG PROJECTS MERE A b' WIDTH MIRY BE USED MNEN SPECIFEO N THE CONTRACT OR DIRECTED BY THE ENCIEER. 0 Ri Rp 65-TO 35 10 71-BO ~0 10 81-90 ~0 60 91-F?0 50 55 N)I.1HI 60 ~5 € THtOUCH t HCHNAY 12'~ P SHOULDER WIDTH BLARES r IT PAYE01 PAYED WpTH SECTION A-A ISHOWWiG BYPASS LAZE AND SHOLlDER1 THIS CONTROL LXE H ESTABLISHED BY A 10:1 TAPER EXTENDED FROM TIE P,C.LOCATED FARTHEST FROM THE TIINOI%iH HgHWAY. w _ ---- Is' ,~ ~•-low 3' 15' ~ I I I I ~ I ia~ TYPE "C" - - - - - - - - - - - - - - - - - - - - - - - - - - - - - THTOUGH HOHNAY ---------_.__ W N _ ~' ~-- qw ~w --I ~, i * 1 N =SHOULDER NDTN R2 O OR 5' IAN. I NOTE: 10:1 TAPER I TYPE 'D' INTERSECTION IS i I A TYPE 'C' INTEASECTNXI LATH CURB d GUTTER THIS CONTROL LME HCONTROL ESTABLISHED 1 BY A Xk1 TAPER EXTENDED FROM THE BACK OF THE CURB ENO LOCATED FARTHEST FROM THE THROUGH HgHNAY, A ~ TYPE "D" 32s~ roo' ~, 3 r L50' 21r ~- _1_ LANE WgTH _ _ THROUGH HGHNAY _ _ _ _ _ _ _ _ _ _ _ _ _ LANE WgTH _` I '_ A BYPASS LANE ~ ' J/ O THS DAENSKXIIS H-FOOT OF PC CONCRETE PAVEMENT 1`I I I~ WHEN MAHiWE IS PC CONCRETE PAVEMENT. SEE SDD 13 C Xi-1 i FOR PC CONCRETE CONSTRUCTION JOINT LOCATNIN, 0 THS DAENSION IS 13-FOOT OF PC CONCRETE PAVEMENT ¢° WHEN MAWILIE IS PC CONCRETE PAVEMENT. ~i TEE INTERSECTION BYPASS LANE DETAIL ~_ 6 v AT-GRADE SIDE ROAD ~ INTERSECTION TYPES 'Br,'82','C' .. AND 'D' AND TEE INTERSECTION a BYPASS LANE v+ STATE OF AiSCON5N1 ~ DEPARTMENT OF TRANSPORTATION G N G \OB\013\Drq EP\RCD02100.d.q Tus. 15 Yav 2007 - 4: 37PM __ AREA ROADS AND SPEED LIMITS (CLOSEST PROXIMITY ROADS TO DERBY GRANGE RD) DERBY GRANGE RD.-OFF JFK -FIRST I/2 MILE 45MPH THEN DROPS TO 35 MPH 1. JOHN F. KENNEDY RD/NW ARTERIAL DOWN TO HWY 52 - 30 AND 35 MPH 2. CLAY HILL RD - 35 MPH 3. RUPP HOLLOW RD.- 35 MPH 4. BURTON FURNACE RD - 35 DOWN TO 30 MPH 5. HALES MILL RD TO ASBURY RD- 35 MPH 6. LORE MOUND RD - 35 MPH 7. SEIPPEL RD - 35 MPH 8. HEACOCK RD - 35 MPH 9. MIDDLE RD - 35 MPH 10. RADFORD RD - 35 MPH e g I~ ~.~ I' X31 ~i ~~` is L.. T ~ $'O r p: d ~ .: OrOwl YorRh n ~ ~ Trenh ~ 9 m Radford as oP Rd ,;n .Ci.. ; Rosemont N St calf Li ~ G ° ;f y~ ~ ~o Vlzalcaa Dr ~ Sharon Hansel O Rd + Inset 2 on paga 2' wnlinuationwest .' 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