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CR 96-116 Change Order - Residential Utility ImprovementsJuly 11, 1996 Proposed Action. Supporting Information • Change Order No. 1 • MSA letter, July 9, 1996 ¥ 4tO P K k APPROVE CHANGE ORDER #1 1996 RESIDENTIAL UTILITY AND STREET IMPROVEMENTS Staff recommends adoption of the following motion: Move that Council authorize Change Order No. 1 as it relates to 1996 Residential Utility and Street Improvements, Proiect #95 -17. Overview. Reconstruction of 8 Street South is underway. Reconstruction work included installation of new 18" and 24" storm sewer pipe and manholes. Due to poor subgrade soil conditions and storm sewer trench bottom instability, new support fill for pipe bedding was required. Additionally, a future change order is expected to cover costs of additional subgrade excavation and granular subbase backfill on the south ends of 8 Avenue and 7 Avenue. Primary Issues to Consider. • What is the justification for a change order? • What are the costs? • What is the nature and estimated costs of the future change order? • Staff recommendation Steven J. Stadler, Public Works Director Council Report 96 -116 Council Report 96 -116 Page 2 Analysis of Issues • What is the justification for the change order? Correction of the unstable trench bottom was necessary to help ensure minimum settlement or movement of the storm sewer pipe. Work included over - excavating 18" below the pipe and installing a bedding of fabric - wrapped coarse aggregate. One manhole had to be reset, additional 3' excavation, and installation of lightweight fill. • What are the costs? The total amount of the change order is $6,718.80. The additional work was extensive. City staff viewed some of the additional work and the City's consultant resident inspector oversaw all work - the additional costs are fair and reasonable. • What is the nature and estimated amount of the expected future change order? The future change order is to pay the contractor for additional excavation and granular backfill on the south ends of 7 and 8 Avenues. The presence of unsuitable, organic subgrade soils extended further than expected up 7 and 8 Avenues. Accordingly, these soils must be removed to a depth of 3' and replaced with granular material similar to what was designed and constructed under 8 Street South. The estimated cost is $30,000.00. • Staff Recommendation Staff concurs with MSA Consulting Engineers' recommendation to approve change order no. 1. Staff recommends Council authorize change order no. 1. CHANGE ORDER (Instructions on reverse side) No. I PROJECT: 1996 Residential Street Improvements OWNER: City of Hopkins (Name, 1010 First Street South Address) Hopkins, MN 55343 CONTRACTOR :Hardrives, Inc. 14475 Quiram Drive Rogers, MN 55374 CONTRACT FOR:1996 Residential Street Improve. DATE OF ISSUANCE: July 3, 1996 OWNER's Project No. 95 -16 & 95 -17 ENGINEER: MSA, Consulting Engineers 1326 Energy Park Drive St. Paul, MN 55108 -5202 ENGINEER's Project No. 158 - 006 -10 You are directed to make the following changes in the Contract Documents. Description: See attached schedule. Purpose of Change Order: Storm sewer extras associated 8th Street South Improvements Attachments' (List documents supporting change) Change Order No. 1 CHANGE IN CONTRACT PRICE: Original Contract Price $ 581.329.80 CHANGE IN CONTRACT TIME: Original Contract Time August 5. 1996 days at daze Previous Change Orders No. — to No. — Net change from previous Change Orders 0 $ 0.00 days Contract Price prior to this Change Order $ 581 129.80 Contract Time Prior to this Change Order pnpnst 5 1996 dap or dale Net Increase Net Increase (Decrease) of this Change Order -0- (D .. ) of this Change Order $ 6 718 80 days Contract Price with all approved Change Orders $ 588 048 60 Contract Time with all approved Change Orders purist 5 1996 days or due RECOMMENDED: APPROVED: APPROVED: By by b�: %i /.�����l.il:� /I' y MSA, Consulting Engineers City of Hopkins ,f.. ves, Inc. EICDC No. 1910-8 -8 (1983 Edition) ' n: \ clerical \158 \wordperf(co# 1- 158.006 158-006 -30 CHANGE ORDER NO. 1 1996 RESIDENTIAL STREET IMPROVEMENTS CITY OF HOPRINS, MINNESOTA 158- 006-30 SrHEDTR F, 14.0 8171 STREET STORM SEWER EXTRAS 1 EXTRA WORK & MAT. ASSOC. / MH 7 LS 1 2 EXTRA WORK & MAT. ASSOC./ STORM SEWER LE 866 3 F &I8 - WYE EA 2 C 06.XLS SCHEDULE 14.0 8TH STREET STORM SEWER EXTRAS -TOTAL PAGE 1 2.820.40 4.4 44 2,820.40 3,810.40 88.00 6,718.80 JUL -10 -1996 17 :10 ll i • IONSIDI(6E16UFEIlS July 9. 1996 1326 E nergy poi 0rn File : - 158.006 -30 $t Paul, MN 55108 612 - 6444359 1.800.888.2923 Fox 612.64946 Cvt£NGNSING Emt4CNMENZAt 'A:Ni iat r1ANNMG SGUO WASTE SS:uCVRAL . RVEYING "UPC I ZANSPCCATICN OFrICEs IN: MINNEAPCUS INF PRICR LAKE Sr. ?AUL WASECA Mr. Steve Stadler Public Works Director City of Hopkins 1010 First Street South Hopkins. MN 55343 RE: 1996 RESIDENTIAL STREET IMPROVEMENTS Dear Mr. Stadler: An Equal Opportunity Ennloyur P. Attached for your review and consideration is a letter from the Contractor, Hardrives, Inc., indicating that poor subgrade conditions have created scheduling delays associated with 8th Street South storm sewer improvements. At this time, the Contractor has not formally requested a time extension to the contract documents, but has verbally indicated that the established completion date may be difficult to meet. We expect the Contractor, upon completing 8th Street South improvements, to re- evaluate this proposed schedule and submit a request for contract time extension by change order. I have discussed this possibility, with our on -site inspettor, Mr. Tom Lindabl, to get his position on an acceptable contract time extension. Considering subgrade difficulties encountered to date. we would suggest that a 10-day contract extension be adequate. In addition to construction delays associated with 8th Street South storm sewer improvements, the Contactor has also encountered similar subgrade conditions under 8th Avenue and 7th Avenue South. near the intersection of 8th Street South. Existing subgrade materials primarily consist of fibrous black peat with high compressibility characteristics, and must be removed and replaced with a granular borrow material in the - upper three feet of the road subgrade. The contract documents did provide for some minor subtnade correction work in these areas as necessary to provide a 10 :1 transition, but did not account for major corrective work which is now obviously required. We have taken the liberty of evaluating construction costs associated with this correction work and estimate these additional costs at approximately 330,000. We would like to make one final comment with respect to utility and street construction operations associated with the 8th Street, 8th Avenue, and 7th Avenue areas. As you are well aware, poor subgrade conditions under 8th Street South have dictated that additional • JUL -10 -1996 17:11 Mr. Steve Stadler July 9, 1996 Page Two corrective measures be utilized to stabilize new storm sewer installations. Geotextile fabric. granular foundation materials. and wood chip materials have been utilized. when required. to provide structural support for new pipe and manhole installations. As previously discussed. these additional construction measures are not intended to eliminate all possible settlements, but are intended to reduce and minimize them. Should you have any questions, please feel free to call me at 6444389. Sincerely, MSA, CONSULTING ENGINEERS '4R Kirk R. Roessler, P.E. KRR:tw 006-0906.1ul P. i JUL -10 -1996 17:11 HARDRIVES, INC. • July 3, 1996 Kirk Rossler, P.E. NSA Consulting Engineers 1326 Energy Park Drive St. Paul, MN 55108 RE; 1996 Residential Street Improvements Hopkins, MN Hardrives, Inc. Job No. 310.96 Dear Kirk: Ronald A- Hall Vice President HARDRIVES, INC. RAH /erw Enc. 1447E Cuwram Drive • Rm•e MN • =r:774.04F1 . 1' 158- 05 10- 30 As per our discussion, enclosed please find the letter from Jerry Stepaniak regarding the changes in the pipe work on the above referenced project. Please note Jerry's concern, and also our concern with the change in construction on the storm sewer along 8th Avenue. After removal of the Laplace materials, it was decided to utilize 18 inches of rock and fabric under the pipe as directed by Jeff Voyea of American Engineering and Testing. Kirk, we ask that you keep in mind these and the additional changes involved in this project when looking at the completion date. Hardrives, Inc. and our subcontractors are committed to complete this project as efficiently as possible, and as timely as weather permits. Thank you for your assistance in this matter. om In. 0111_ h/'....J •.. _CMM Pt C.70% TOTAL P.04