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Home My WebLink AboutGranite Construction - Santa Teresa Blvd. Widening Project - Change Order No. 02 035 qcitp of ~ilrop Planning Division Engineering Division Building, Life & Environmental Safety Division Housing & Community Development COMMUNITY DEVELOPMENT DEPARTMENT 7351 Rosanna Street, Gilroy, CA 95020 (408) 846-0440 FAX: (408) 846-0429 (408) 846-0450 FAX: (408) 846-0429 (408) 846-0430 FAX: (408) 846-0429 (408) 846-0290 FAX: (408) 846-0429 CHANGE ORDER NO.2 To contract for: Santa Teresa Boulevard Widening Project Project No. 04-CDD-128 Contractor: Granite Construction Company Contract Date: 5/17/04 This order shall become effective when it has been signed by the City Administrator, City Engineer, Project Engineer, and Contractor. All copies forwarded to Contractor for signature shall be returned to the City of Gilroy properly filled out. Upon acceptance by the City, the Contractor's copy will be returned to him as his authority to proceed with the work. Description ofW ork: Construct alternate pavement section consisting of 6" AC over 6" Class 2 AB over 15" lime-treated subgrade (4% Quicklime Plus) per attached letter dated July 23,2004. Work shall be performed in accordance with Section 24 of the Caltrans Standard Specifications. Section 24-1.04 and 24-1.09 are modified as follows: 24-1.04 PREPARING MATERIAL Unless otherwise ordered or approved by the Engineer, the material to be stabilized shall be placed to the lines, grades and dimensions shown on the plans before lime is added. The surface of the material to be stabilized shall not vary more than 25 mm (0.08-foot) above or below the grade established by the Engineer, before lime is added. 24-1.09 CURING Curing by water will be permitted. Curing period shall be 4 days, with 3 daily applications of water. The contract bid items are adjusted as follows: Unit Orig. Revised Item Description Unit Price Quantity Ouantity Savings 21 Roadway Excavation (F) CY $3.00 39,000 14,850 . $72,450 52 Asphalt Concrete Ton $53.00 23,246 20,862 $126,352 53 Aggregate Base (F) Ton $6.00 66,400 32,171 $205,374 54 Filter Fabric SY $1. 00 60,000 0 $60.000 $464,176 Page 1 of2 "First In Service to the Community" The following additional costs are included in this change: Description Unit Amount Lime Treatment Contractor's Share of Savings LS LS $ 368,125 $2 L 051 $389,176 Net Decrease = $75,000 All requirements of the original Contract Documents shall apply to the above work except as specifically modified by this Change Order. The contract time shall not extend unless expressly provided for in this Change Order. I (We) agree to make the above change subject to the terms of this Change Order for the NET DECREASE of $75,000. 6~\1t ~~ilo"'; tor4'~ By' It ClJr // ~ Date: 11/l7Ia! Original Contract Price: $7,448,458.00 Previous Change Orders: 18,280.00 TOTAL TO DATE: $7,466,738.00 (75,000.00) lIDs Change Order: Revised Contract Price: $7,391,738.00 ".--..... f) (~:...<<. ..')~\~..9- ) ACCEPTED' ,..:::::......".:'"':..:~--."",........ ....... --..::;;;r ( c;i~ A'.. ''''~'''' Page 2 of2 Charlie Krueger Ghiradelli Associates City of Gilroy 7351 Rosanna Street Gilroy, CA 95020 RECEIVED JUL 2 3 2004 ENGINEERING IIiRAnlTE COnSTRUCTiOn romPAny sl~SE July 23, 2004 Reference: Santa Teresa Boulevard Widening Project Project Number: 04-CDD-128 GCCO Job Number: 201-737 Subject: Lime Treatment Cost Proposal Charlie, As previously discussed, please find below Granite Construction Company's proposal for an alternate pavement section for the Santa Teresa Boulevard Widening Project. The structural section recommended by Consolidated Engineering Laboratories (see attached letter) is as follows: The alternate structural section would result in a cost savings as outlined below: 21 ROADWAY EXCAVATION N/ALlME TREATMENT 52 ASPHALT CONCRETE 53AGGREGATE BASE 54 FILTER FABRIC -24,150 CY $3.00 1 LS $368,125.00 -2,384 TON $53.00 -34,229 TON $6.00 -60,000 SY $1.00 TOTAL CONTRACT REDUCTION -$72,450 $368,125 -$126,352 -$205,374 -$60,000 -$96,051 Weare planning to reclaim the asphalt concrete and aggregate base from the existing Santa Teresa Boulevard for use in constructing the new structural section. As a condition to this proposal we are requesting that item number 53 "Aggregate Base" be treated as a final pay quantity calculated based on the reduced quantity of 32,171 tons at the bid unit price of $6/ton. Monterey Bay Branch P.O. Box 720 Watsonville, CA 95077 (831) 763-6100 FAX (831) 763-6121 As outlined in the attached letter from Consolidated Engineering Laboratories the lime treated subgrade would provide the following benefits: 1. Increased structural strength of the subgrade soil. 2. Stabilization of unstable soil, reducing potential extra work. 3. Minimize the shrink/swell potential of the clayey material. 4. Reduce the effects of water intrusion into the sub grade soil. 5. Reduce the amount of imported and exported material, thus reducing the impacts of truck traffic on existing city streets. In the spirit of partnering we are requesting to share in the savings proposed due to the reduced quantities of material required to construct the project. If accepted, the alternate pavement section would provide the City of Gilroy with an improved structural section with the added benefit of an overall cost savings. Thank you for your consideration of this cost proposal. If there are any questions or concerns, representatives from Granite Construction Company, Griffin Soil Stabilization (Lime Treat Contractor), and Consolidated Engineering Laboratories are available to discuss this issue in further detail. If you have any questions with regards to this matter please call 831-763-5539. Thank You, GRANITE CONSTRUCTION COMPANY ~ JhtV Steve Walter Project Manager ~7!22/2004 23:05 9258522254 l:lt-::lI-I-IN ~UIL r-H\;ll:. tJL #2'~... .i.dl ~ CONSOLIDATED ENGINEERING' LABORATORIes July 23, 2004 Griffin Soil Stabilization and Asphalt 7060 KolI Center Parkway, Suite 324 Pleasanton, California 94566 Attention: Richard Haro Subjec.t: Alternate p:lvcment RQcommendation~ Santa Teresa Boulevard Widening Project Gilroy, California eEL Proposal No. 81-01540 References: 1) Alternative:: povement Sections, ESCNC, August 27,2001 2) Soil Engineering Study Update, ESCNC, February 28, 2001 3) Soil Engineering Study, ESCNC, October 18, 1994 Dear Mr. Haro: Consolidated Engineering Laboratories (GEL) Geotechnical Division has been requested to provide pavement recommendations for the subject project. We have reviewed the referenced documents, and concur with the recommendations contained in these reports. However, we are providing alternative pavement sections for your consideration to provide, in our opinion, a higher quality pavemenllhat most likely will be more economic. The recommended alternative pavement section is: 8 9 5 6 6 6 15 15 26 27 The subgrade soil would be treated with 4 to 5 percent Quicklime Plus based on a soil unit weight of 100 pct. The treatment of the subgrade will provide the following benefits: . Treatment with a stabilization reagent, such as quicklime or cement, would enhance the structural strength of the subyrClde soil, thereby increasing the existing R V31ue 5 material to an R-Value of over 60, This increased R-Value would significantly reduce the overall pavemp-nt section. . It is our understanding that the subgrade soil may be unstable and pump under vehicle loading, and may need to be stabilized. Soil treatmtmL would stabilize the subgrede soil. . Treetmcnt of the 6ubgradQ soil will minimize thP. !';hrink/swell potential of the onsite clayey soils. Some of the soil reported in the referenced reports is highly expansive. 7060 Koll Center Parkway, SUite 300. Pleasanton, CA 94566.3108. Tel, 925 485-5000. FAX 925485-5018 '07/22/2004 23:05 '32:,l:lbLL2b4 ~I'<:H'r-.l.I'i :::lU.l.1... c, GEL Project No. 81-01540 June 23,2004 CONSOLlDA i t:U ENGINEERING I-ABORATOHIES . Tre3ted soil is less permeablp. than the onsite soil. and would reduce the effects of water intrusion into the subgrade soil, which is one of the main causes of pavement failure. As a result, it will prolong the future life of the pavement. . Creates a pavement foundation that meets the Strategic Highway Research Program (SHRr) requirement for Long-Term PavemAnt Performance (L TPP). Perpetual Pavement Design requires the need for a stable working platform and a consistent roadbed which are essential to the idea of precluding distress that originate deep in the pavement structure, . Decreased pavement section would significantly reduce the amount of exported subgrade soli and impur led baserock to the sitc, which would reduce the amount of traffic on the streets leading into the project. It would also reduce the stress on the existing roadways, causing less damage and repairs. . Treatment will reduce the amount of grading required at the site, since native material will be utIlIzed more efficiently; thu~ i'eplacing imported matcriol with native material . Treatment would Clcr:~lp.rate the construction schedule by reducing the amount of grading. . Current treatment process utilizes specialized equipment and procedures that ensures quality control throughout the process. We hope this provides the necessary information for the client to decide on the appropriate pavement options for this project. If you have any questions, please contact the undersigned at (925) 485-5000. Sincerely, CONSOLIDATED ENGINEERING LABORATORIES William R. Stevens, PE43010, GE2339 Principal Geotechnical Engineer DistritJuliun. 3 to AddrelSsee (925/485-55404 Fox 6030) L:\Users\Geotech\RepPleasanton\81-01540-Sanla Teresa\81-0 1540-ST eresaPaveRecs.doc 2