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CR 96-146 Interlachen Street Improvements• September 16, 1996 Proposed Action. PROPOSED 1997 INTERLACHEN STREET IMPROVEMENTS PUBLIC INPUT PROCESS Council Report: 96 -146 Staff recommends adoption of the following motion: "Move that Council approve Interlachen street design public input process as recommended by staff." Overview. The condition of several blocks of streets in the Interlachen neighborhood warrant some level of reconstruction - see attached pavement condition analyses and report. Current City policy calls for concrete curb and gutter whenever an existing street is reconstructed. The exception being if a petition of 55% of the affected property owners prefer a raised asphalt edge. Interlachen neighborhood is a very 1 distinct unique Hopkins area. Staff would like to ensure consistent policy on all future street improvements to maintain uniform street design and neighborhood character. Therefore, prior to proceeding with a proposed 1997 street improvement project, neighborhood -wide public input is needed in determining an Interlachen street design. Staff proposes this be accomplished through a neighborhood public information meeting in early October. A proposed letter and enclosures are attached to this report. Primary Issues to Consider o Project Schedule In order to proceed with a 1997 Interlachen street project, a feasibility study must be ordered at the October 15th Council meeting. This would allow sufficient time for additional public information meetings, design, public hearings, bidding and construction. o Staff Recommendation Staff recommends proceeding with the October 2nd public information meeting. The results of the meeting, a possible subsequent petition, and additional staff input would be used to determine Interlachen street design. Supporting Information o Pavement Eval tion Report o oposed I .t r'achen Neighborhood letter Steven J. Stadler, Public Works Director BRAUN INTERTEC August 29, 1996 Mr. Steve Stadler Public Works Director City of Hopkins 1010 First Street South Hopkins, MN 55343 Re: Evaluation of Hopkins City Streets Dear Mr. Stadler: The streets you requested reviewed were surveyed August 22, 1996 by experienced personnel from our office. At that time the existing distresses were quantified and the results utilized to calculate 1996 Pavement Condition Index (PCI) values. The calculation summaries for all sections are attached to this letter. Following are notes made during our field survey regarding the condition and possible rehabilitation recommendations for all sections. 1st Street North from 12th Avenue North to 10th Avenue North These two sections are very similar in that they both contain 100 percent high - severity block cracking. However, this is masked somewhat by a chipseal which appears to have a high oil content, therefore, the block cracking must be rated at a lower severity. It is our opinion that if not for the chipseal masking distresses the PCI would be substantially lower. There appears to be multiple overlays of the sections resulting in a diminishing curb with no curb in some areas. There are multiple "throw and go" temporary patches, possibly filling areas of potholes or removed chipseal. It is difficult to determine the condition of the underlying asphalt. It is likely this is a thick asphalt section with the sublayer asphalt possibly in poor condition. A recommended rehabilitation for this section would be to conduct milling of much of the existing asphalt. At that time the remaining asphalt should be assessed for structural condition and, if intact, an overlay placed. If the underlying asphalt is found to be in poor condition the remaining asphalt should be removed, the aggregate reworked and the section paved. For long term maintenance of this road it is recommended curb and gutter be installed. Braun Intertec Corporation 6875 Washington Avenue South P.O. Box 39108 Minneapolis, Minnesota 55439-0108 612 -941 -5600 Fax: 942 -4844 Engineers and Scientists Serving the Built and Natural Environments® City of Hopkins DBNX 96 -970 August 29, 1996 Page 3 removed, the base reworked, and overlay placed with the additional recommendation of curb being placed. If this is a thick mat of 3 or more inches, it is recommended 1 1/2 inches of the surface be milled, the existing Load- related distresses repaired and a thick overlay be placed with the addition of curb being recommended as well. Several of the sections surveyed have a substantial increase in block cracking since last surveyed in 1994. This may be due to the excessively cold winter experienced this past year. The extreme cold may Lead to increased weather - related cracking of many pavements. Additionally if the sections were seal - coated one or two years prior to the previous PCI rating some distress may have been masked during that survey. Information typically used to make rehabilitation decisions would include present surface condition, traffic loading projections, and pavement composition including layer type, thickness, and condition plus subgrade type and strength. For this report only the surface condition of the pavements is considered; therefore, the recommendations given are preliminary. On the sections where milling is recommended, it will be possible to evaluate the visual condition of the asphalt, however, a structural thickness of an overlay cannot be determined. We recommend that the streets be cored to obtain thickness information and allow a visual examination of the condition of the asphalt intended to be left in place, and the aggregate base and subgrade can be sampled and identified through the core holes. Dynamic Cone Penetrometer (DCP) tests can be conducted on the base and subgrade prior to aggregate sampling to determine their strength. This information would enable more precise decisions to be made in advance of any rehabilitation, resulting in less risk that poor materials may be left in -place possibly shortening the service life of the rehabilitation. General Use of Report This report is for the exclusive use of the addressee to use to design the proposed structure and prepare construction documents. In the absence of our written approval, we make no representation and assume no responsibility to other parties regarding this report. The data, analyses and recommendations may not be appropriate for other structures or purposes. We recommend that parties contemplating other structures or purposes contact us. Level of Care Services performed by Braun Intertec Corporation personnel for this project have been conducted with that level of care and skill ordinarily exercised by members of the profession currently practicing in this area under similar budget and time restraints. No warranty, •reet Name : Ashley Road Report Date: - 8/22/96 Low Med High Low Med High Low Med High `�IF�ed High Low Med High Low Med High SurfaceLength 310 City of Hopkins PCI Condition Report For Asphalt Pavements From : Boyce Street To : Preston Lane SurfaceWidth 30 Area 9,300 PCI 36 Date 9/26/94 Alligator Block Cracking Cold Joint Corrugation Depression Edge Cracking Flus 2,325 hing Heave Longitudinal Cr. 60 4,650 75 Patch SurfaceLennth Patch Patch Pothole Pothole Pothole 310 SurfaceLennth 180 Raveling Reflect Cr. Rutting SurfaceWidth Raveling Reflect Cr 30 SurfaceWidth 30 Raveling Reflect Cr. Rutting Rutting Area Area Shoving Slippage Transverse Cr 2 1 'Street Name : Ashley Road From : Boyce Street To : Preston Lane 9,300 Polished Arc: Temp Patch: 15 Skin Patch: PCI 3 Date 8/22/96 Alligator Block Clacking Cold Joint Corrugation Depression Edge Cracking Flushing Heave Longitudinal Cr. 475 2,532 310 5,908 Shoving Slippage Transverse Cr S treet Name : Ashley Road From : Preston Lane To : Excelsior 5,400 Polished Any: Temp Patch: 74 Shin Patch: PCI 29 Date 9/26/94 Alligator BlockCracking Cold Joint Corrugation Depression Edge Cracking Flushing Heave Longitudinal Cr. 100 200 60 15 1 40 3 2 2 30 30 Shoving Slippage transverse Cr Polished Asa: Temp Patch: Skin Patch: Report Date: - 8/22/96 /reet Name : Preston Lane Low Med High Low Med High Low Med High Red High Low Med High Low Med High SnrfaceLensth 951 Patch SurfaceLength Patch Patch Pothole Pothole Pothole 951 From : Ashley Road SurfaceWidth 30 Raveling Reflect Cr. SurfaceWidth 30 SurfaceLenpth 330 SurfaceWidth City of Hopkins PCI Condition Report For Asphalt Pavements 30 To : Interlachen Road Area 28,530 PCI 52 Date 9/26/94 Alligator Block Cracking Cold Joint Corrugation Depression Edge Cracking Flushing Heave Longitudinal Cr. 30 440 5 270 420 120 140 10 30 10 Rutting Shoving Slippage Transverse Cr 15 40 240 90 30 Street Name : Preston Lane From : Ashley Road To : Interlachen Road Area 28,530 160 510 75 Raveling Reflect Cr. Rutting Shoving Slippage Transverse Cr 120 80 690 Area 9,900 Raveling Reflect Cr. Rutting Shoving Sli ppage Transverse Cr 180 Polished Apo: Temp Patch: Skin Patch: PCI 12 Date 8/22/96 Alligator Block Cracking Cold Joint Corrugation Depression Edge Cracking Flushing Heave Longitudinal Cr. 170 125 150 1,490 2,000 445 3,050 80 Polished Aop: Temp Patch: Skin Patch: I treet Name : Preston Lane From : Interlachen Road To : Maple Hill Road PCI 92 D ets 9/26/94 Alligator Block Cracking Cold Joint Corrugation Depression Edge Cracking Flushing Heave Longitudinal Cr. 900 300 Polished App Temp Patch: Skin Patch: Sept 13, 1996 Dear Interlachen Neighborhood Resident The City of Hopkins is considering 1997 street improvements for several blocks of Interlachen streets. Those streets are Preston Lane from Ashley Road to Homedale Road, Ashley Road from Boyce Street to Excelsior Blvd and Holly Road from Goodrich Street to the dead end. City staff believes that the condition of these roads dictate improvement beyond a thin asphalt overlay and/or sealcoating. The appearance and function of these street improvements will, most likely, set the standard for all future Interlachen street improvements. New streets have a pronounced influence on the environment and character of a neighborhood. For this reason, City staff would like your input on the design of the proposed 1997 street improvements. City staff will present street design alternatives at a public meeting in the City Hall City Council Chambers at 630 p m on Wednesday, October 2n Current City policy calls for new streets to be constructed with some type of concrete curb and gutter. This is because concrete curb and gutter has been proven to be cost - effective in extending the life of a street by improving drainage, edge control, and maintainability. The policy doesn't dictate the type of curb and gutter as there are several different styles available and varying appearances can be achieved. Hopkins has used different designs on past street projects with great results. However, the policy also states that the neighborhood can request a raised asphalt edge if they present a petition signed by no less than 55% of the affected property owners. For reasons mentioned above, City staff believes that all Interlachen neighborhood residents are affected by a decision on the proposed 1997 street improvements. City staff feels the public meeting presentation and discus will be helpful in ensuring neighborhood residents are fully informed. 1010 First Street South Hopkins, Minnesota 55343 Phone: 612-935-8474 Fax: 612-935-1834 An Equal Opportunity Employer Staff would like to request City Council approval to proceed with a preliminary design study on October 15 City staff would need to know the desires of the majority of lnterlachen residents prior to that date. Please review the attached information and attend the meeting, if possible. If you have any questions or comments prior to the meeting, please call me at 939 -1338. Sincerely, Steven taller Director of Public Works enc. Page LPM - 5 Policy #8 -B EXCERPT — ROADWAY IMPROVEMENT PQLICY 8. LOCAL STREETS 8.01 Local Streets are generally streets which service a small area and do not typically involve a movement of traffic between areas. Local streets typically connect two collector streets or county roads. Streets of this type include local streets, cul -de -sacs, and service roads. Local streets within the City of Hopkins are constructed with a minimum capacity of 7 tons per axle. The primary source of funding of local streets is special assessments. 8.02 New local streets shall be constructed with curb and gutter. When reconstructing streets concrete curb and gutter shall be installed where currently in use, and in other areas unless the neighborhood presents a petition of not less than fifty -five percent (55 %) of the affected property owners requesting raised asphalt edge. Raised asphalt edge shall be installed wherever concrete curb and gutter is not used. Design modifications shall be established as appropriate to address drainage and maintenance concerns. 8.03 New local street minimum unobstructed street width, (face -face of curb) is 30 feet. The standard unobstructed street width for reconstructed streets shall oe 26 feet. Streets which do not meet this requirement shall be reconstructed at current width (unless a wider street is desired by the affected residents) but not less than twenty feet (20') unless the Council fords that: A twenty foot (20') width would adversely affect trees or other significant or desirable physical features: and A reduced width would not constitute a distinct hazard to life or property. Factors to be considered shall include, but not be limited to, safe access of emergency vehicles, snow storage requirements, availability of parking, and aesthetics. 8.04 Streets which are twenty-six feet (26') or more in width will have parking allowed on both sides. Streets less than twenty-six feet (26') in width may be subject to parking restrictions on an "as needed" basis. Parking restrictions could be established at the time of street projects or at any future date based upon general City parking requirements. Factors to be considered shall include, but not be limited to, staff report regarding safety and emergency vehicles access and neighborhood input. Where streets are less than twenty-six feet (26') in width, the staff shall assist the neighborhood in identifying areas where existing street width can be increased to provide additional parking. 9. ALLEYS 9.01 Alleys are minor roadways which service parcels of property along the rear property line. The primary source of funding of alleys is special assessments. 9.02 All alleys shall be concrete construction. Alley width is generally 10 feet in residential areas and 12 feet in commercial ares. • PAVEMENT DESIGN Asphalt with rolled asphalt edge and edge drains Asphalt with surmountable concrete curb & gutter Asphalt with 6" vertical concrete curb & gutter PAVEMENT DESIGN ALTERNATIVES EST COST EST COST EST DESIGN PER FOOT* PER 300' BLOCK LIFE (YRS) $50 $60 $15,000 - $18,000 20 - 30 $56 - $70 $16,800 - $21,000 30 - 40 -- slightly more than surmountable -- 30 - 40 *costs vary based on the amount of underlying base course work required to achieve desired pavement strength -4 X B618 Concrete Cu. Yds. L/F Per Per L/F Cu. Yd. 0.0582 17.2 • 6" CONCRETE CURB DETAIL (t o' a w 5 r• r• 0 ro G r m rn G ri v Cr r• ft) FL rt 0) 0 0 r 0i 0 in m t41, I el 0 O T - 4 N T V V r0 0 n r 01 0 0 0 io y 111 0 0 N T —I 0 1 A z A N V Mountable Concrete Cu. Yds. L/F per per L/F Cu. Yd. 0.0540 18.5 MOUNTABLE CONCRETE CURB DETAIL --- - - - - -- 3/4' • s 28" e SLOPE 1/4" ' 12 16' PER FOOT \ \ \ 4 .R =12' \ e 4 \ 4" 6 -1/2" t b01/2"