Loading...
HomeMy WebLinkAboutCOW 2004-07-12 Item 5A - Budget - South 180th Street Grade Separation Drainage Repair w‘ :,ii COUNCIL AGENDA SYNOPSIS ,'o rt•� s Initials ITEM No. A i �,t b ?Oi I Meeting Date I Prepared by 1 Mayor's review I Council review I 1 07 -12 -04 1 B4: P G I 1,,,v,v' 1 fir. 1 1 Li I I 1 O` isos I I I 1 1 I CAS NUMBER: 04-098 I ORIGINAL AGENDA DATE: JULY 12, 2004 (AGENDA ITEM TITLE South 180 Street Grade Separation Drainage Repair CATEGOR X Discussion Motion Resolution Ordinance Bid Award❑ Public Other MtgDate MtgDate MtgDate MtgDate MtgDate gItglat MtgDate SPONSOR Council Mayor Adm DCD Finance Fire' Legal P&R Police X PW SPONSOR'S A minor storm drainage repair will be constructed this year under the 2004 Annual SUMMARY Drainage Program, but charged to the Annual Overlay and Repair budget. REVIEWED BY COW Mtg. CA &P Cmte F&S Cmte X Transportation Cmte. Utilities Cmte Arts Comm. Parks Comm. Planning Comm. DATE: June 28, 2004 RECOMMENDATIONS: SPONSOR /ADMIN. Forward to COW for information COMMITTEE Same as sponsor i{� ail"' Itwt, W xotlO _1 ESTIMATED EXPENDITURE REQUIRED AMOUNT BUDGETED APPROPRIATION REQUIRED S86,440.00 Fund Source: 104.02.595...85 Comments: Expenditure is estimated. Actual cost to be determined at time of bid award. av- r p r e -r rv' z I I f i +a� i® r3.+`3e.,'£,''_ t"STi `.ttr ,a ti atti LTV. kcag'zu ro,rs 22 07 -12 -04 I Memorandum from James Morrow dated June 24, 2004 I Minutes Transportation Committee June 28, 2004 INFORMATION MEMO To: Mayor Mullet From: Public Works Directo~(~ Date: June 24, 2004 Subject: S 1804 St Grade Seuaration Drainage Repair ISSUE Since the reopening of S 180~ St in May 2003, it has become apparent that the "wet spot" near the bottom of the underpass is not going to dry up and go away. BACKGROUND The design of the underpass allowed up to 50 gallons per minute (gpm) of leakage and infiltration through the Cement Deep Soil Mix (CDSM) seal slab and the interlocking secant pile wall (primary and secondary shaft wall). After final excavation of the underpass, the leakage test resulted in only about 13 gpm. So, the underpass contractor can not be held responsible for the current drainage situation. Currently, there is aa underdrain system that runs under all of the curb and gutter in the underpass with 2 transverse underdrain lines that connect from curb to curb and are 120 feet apart. Also, we think the gravel base supporting the asphalt is not sufficiently permeable to allow free drainage to the curb such that the path of least resistance is straight up through the pavement. The proposed solution is to install 14 new transverse underdrain lines from curb to curb capped with a more permeable gravel, capped off with a construction geotextile for underground drainage. The cost estimate for this solution is $86,440.00. RECOMMENDATION Move forward with adding this drainage repair work to the 2004 Small Drainage project and charge the work to the 2004 Overlay Program. The 2004 Overlay Program bid award was $727,940 and extra work was added under Change. Order 1 for $108,000, for a current contract total of 835,940.00. The budget for the Overlay Program is $1,000,000, so this leaves $77,620 for contingency in the 2004 Overlay and this drainage repair. attachments South 180th Street grade Separation South 180th Street Grade Separation Drainage Repair Engineer's Estimate of Probable Construction Costs Quantity Unit Item Unit Cost Total 1 LS Mobilization $5,000.00 $5,000.00 300 Hr Traffic Control Labor $40.00 $12,000.00 I LS Temporary Traffic Corit'rol Devices $15,000.00 $15,000.00 500 Hr Sequential Arrow Sign $5.00 $2,500.00 I LS iSurvey $2,000.00 $2,000.00 850 SY Removing Asphalt Concrete Pavement $10.00 $8,500.00 136 CY Removing CSBC $15.0'0 $2,040.00 1000 LF Trench Excavation $3.00 $3,000.00 1000 SY Geotextile $2.00 $2,000.00 1000 LF Underdrain Pipe $7.00 $7,000.00 4 Ea Connection to Drainage Structure $500.0C $2,000.00 80 CY Washed CSBC $50.0(~ . $4,000.00 70 CY CSBC from Stockpile $20.0C $1,400.00 300 Ton Asphalt Concrete Pavemer~t Cl. B $60.0C $18,000.00 1 LS Pavement Markers $2,000.00! $2,000.00 TOTAL $86,440.00 South 180ta Street Grade Separation Drainage Repair Specifications General Ail material and workmanship shall be in accordance with the requirements of the 2004 WSDOT/APWA Standard Specifications, except that Asphalt Concrete Pavement Cl. B shall be per the requirements of the 2002 Standard Specifications. Inspection of CDSM by Owner and Owner's Consultants The Contractor shall notify the Owner at east 24 hours prior to the time that the top surface of the CDSM will be exposed. After the top surface has been exposed and has been free of external water (rain, hosing off, etc.) for at least 12 hours, the Contractor shall allow 24 hours for the Owner and the Owner's consultants to inspect the exposed CDSM to determine if pressure grouting or any other out of scope work is needed. The Contractor shall build this 24 hour downtime into his bid, although the survey described below shall be done during this 24 hour period. If the Owner extends the downtime beyond 24 hours, it will be considered a changed condition. If any other work besides the work shown in the plans is required, that shall also be a changed condition. This process shall apply to each half of the repair area as it is exposed. Survey The Contractor shall prepare two scale survey drawings, with all dimensions called out, of the repair area indicating the areas that are wet due to leakage from below. These surveys shall only be done after the surface has been free of external water and any traffic for 12 hours. The first survey shall be done of the pavement surface prior to beginning pavement removal and the second shall be of the exposed.top of CDSM after removal of all the existing crashed surfacing base course. To the degree possible, the w~t areas shall be designated as areas where there are active leaks or as areas that are wet due to the flow of water across the surface. The method of survey can be by cloth tape or tape measure using the east end of the concrete pavement and the Pavement Markings After the new asphalt is placed and .before each half is reopened to traffic, the Contractor shall install new raised pavement markers to match the existing ones. T~affic Control In the lump sum bid for this work, allow for two (2) flaggers for fifteen (15) working days with ten (10) hour days. Also allow for two (2) sequential arrow signs for fifteen (15) working days and two (2) portable changeable message signs (PCMS) for twenty-eight (28) calendar days at the locations shown on 5 of 5. The PCMS shall be installed one (1) week prior to setting up the traffic control and shall read "ROAD WORK; mo/day TO mo/day; EXPECT DELAYS. South 180th Street Drainage Repair South 180th Street Drainage Repair South 180th Street Drainage Repair South 180th Street Drainage Repair Transportation Comnlittee June 28, 2004 Present: Joan Hernandez, Joe Duffle, Pam Carter Jim Morrow, Frank Iriarte, Pat Brodin, Bob Giberson, Cyndy Knighton, Lucy Lanterbach; citizens Joyce Mathison, Jim Mulryan 1. Speeding Traffic on 50th Place South Joyce and Jim explained the problem of vehicles speeding down the S. 129th bridge from Skyway into Allentown. Speeds are of'ten 45-55 mph in a 25 mph zone. Joyce's daughter and Jim's friend were both hit backing out of their 50th Place driveways even though they had looked before backing. Joyce said she knew the City had no extra money, but hoped someone could (1) do a traffic study of the area and make a suggestion about what could be done (2) provide more police enforcement on a regular basis (3) use the mobile traffic speed detector reader board and (4) repair the broken curbing. Jim M said he had already talked to Keith about enfomement there, and the Chief had agreed to focus some patrols there. He said each traffic problem requires a different solution. Cyndy said they could put out counters that tally both traffic volumes and speeds. Though there is limited space for the mobile speed sign, both Joyce and Jim said it could be put on their property. Cyndy explained they were in the process of developing a program to identify the neighborhood traffic problem areas in the City, and would go from there to look at potential solutions tO alleviate the problems. However, they may not be able to completely resolve them. Joyce and jim also'talked about the curbing that gives pedestrians some protection. It has been hit often and is chipped and broken in areas, and needs a coat of paint. With Codiga Farm Side Channel Park'being developed just across the road from them, people will be walking there, and it is a very dangerous area because of the high speeds and the curve that prevents visibility to and from the hill bridge. Joyce also reported the rendering plant has incoming trucks that are not covered, and that have large animal carcasses sticking out the tops of the trucks. It is only late at night the uncovered trucks come, and they have a powerful smell that's unpleasant. Report b~/ck to Committee. 2 S. 180th Street Grade Separation Drainage Repair There is a wet spot on the pavement on S. 180t~, and it is making some drivers unhappy, as it splashes on their clean cars in dry weather. Staffhas viewed the wet spots, and has seen them migrate but not go away. Their conclusion was that more direct drains are needed in the whole wet area under the road. Unfortunately, they can't make the contractor do the work, as the wetness is within tolerances. Bob explained it's in an area that deep soil mixing was needed but not done extensively because it was under power lines and couldn't be reached by the big machinery that mixed the other areas. To tear up the roadway, install more drainage, and repair the road will cost about $86,000. It will be put into the small drainage program to be done, but the funds will come from the overlay and repair budget. Forward to COW for information only.