Purchasing Division 2101 O Neil Ave., Room 309 Cheyenne, WY /

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1 Purchasing Division 2101 O Neil Ave., Room 309 Cheyenne, WY / Addendum No. 4 BID NO. S To: From: Bidders responding to Bid #S Civic Center Commons Park. Sara Vasquez, Purchasing Manager Date: May 9, 2018 Subject: Addendum #4 Bid #S is amended as follows: 1. There are no bid items for the Signs, Striping and Performed Thermo Plastic Markings. These items are subsidiary to other bid items. 2. Bid items item s No. 91 and No. 110 are the same. Item 110 should not be used. 3. New form for Part 3 is attached. ( ed on ) 4. Q&A listed below. a. According to Addendum #1 the City will be responsible for Soil Screening and analysis above 2 feet and the contractor all soil below 2 feet. Does the city plan to require the contractor to phase the excavation in such a way as to remove the top 2 feet before performing any deeper excavation? Yes, that was my understanding. Also, the contract documents call for sampling every 500cy, but the Cheyenne landfill would require every 200cy. Will the testing the City is doing be at the 200cy or 500cy frequency; i.e. if the contractor wants to dispose of the soil free of charge, will they have to have additional testing on the top 2 feet done at their expense? Please use the landfill s required sampling frequency. b. The Phase II soil data shows arsenic concentrations within typical background concentrations for Wyoming soil (Fact Sheet #12, Tech Support Memo #2). What is the arsenic concentration WDEQ-VRP is going to be considering restricted that requires segregation and approved disposal for this project? Migration to groundwater This becomes an issue since all of Phase II ESA soil borings exceeded residential soil cleanup levels (restricted levels) for arsenic, which per the project specification are supposed to be removed from the site. This scenario will likely equate to the whole excavation and is much more than the 3,600 Tons of restricted/non-haz soil disposal described in the bid tab sheet. Since no clear source was identified for the arsenic impacts, the impacts were assumed to be more localized than the data indicated. On-site screening of the soil using the XRF is intended to identify impacts and minimize the amount classified as restricted. However, the 3600 tons is only an estimate.

2 c. Section (A) calls for soil screening using a XRF. Without any interference from lead concentrations, an Olympus XRF detection limit for arsenic is 9 mg/kg in soil which is higher than any of the soil sample results found during the 2014 Phase II ESA. Additionally, no soil sampled below 2 feet showed high concentrations of lead. Due to this reason, the XRF seems excessive/inappropriate for field screening required by the contractor on this project based on available data. Is the XRF required for field screening? No. We were not notified by our XRF vendor of the detection limit you mention. If you feel that XRF is not appropriate, please propose an alternate field screening method for metals. d. No soil staining or PID readings were encountered in the Phase II ESA. What frequency of field screening (i.e. visual, PID headspace readings, or XRF) is required during the excavation or is field screening primarily triggered by visual signs of contamination and atmospheric PID readings? No screening frequency was recommended as I intended visible color or lithologic changes as the primary driver of screening. PID screening is recommended due to potential volatiles in the groundwater so screening frequency may need to be adjusted as the excavation depth increases. e. Section 1600 Part 2.01 (A). States 40-mil plastic sheeting must be used if soils are stockpiled on an uncontaminated surface to provide an impermeable barrier. As an alternative, can the 5-point composite soil samples be collected from the excavation area prior to excavation at a minimum of every 500 CY? If you can prevent crosscontamination of soils, then an alternate prevention/storage method is acceptable. Then when the soil results are available the soils can be excavated and loaded into haul trucks directly for disposal/reuse without stockpiling. f. Just to confirm the new bid tabs, the contractor will be responsible for the HASP and Waste management plan, but not the waste profiling investigation to be completed beforehand? Yes. g. This statement leads me to believe all personnel excavating/grading/backfill/hauling in the pond area need HAZWOPPER training and have insurance to do that type of work (HASP.3. Any of the Contractor s personnel that will come into contact with soil or groundwater through removing or managing non-hazardous waste or hazardous waste shall have documented 40 hours of initial training per 29 CFR 1910 (HAZWOPPER) and current 8-hour annual HAZWOPPER refresher training). Please clarify? As for the comment in the attachment (Scanned from Xerox.PDF), I feel like the screening personnel should be 40-hour HAZWOPER trained. The excavating personnel don t need to be assuming that the screening does not indicate the material is hazardous. Any field indication of a change in the material classification (i.e. PID reading increases in soils below the water table) would trigger a re-evaluation. h. Does all material going to the City Landfill have to be tested every 200 CY? My understanding is yes. i. Clarify Response No. 45. How is this paid? Still need sub-ex item and what is included in item? I don t see a Comment Response #45 in the attachment. I believe the reference is to the Addendum 1 responses. I don t have a recommendation on payment. We don t expect significant sub-excavation due to the dewatering. If sub-ex is required, payment can be requested using the force account. j. Clarify Response No. 46. How is it paid? I don t see a Comment Response #46 in the attachment. I believe the reference is to the Addendum 1 responses. A structural fill bid item was added. We don t expect significant sub-excavation due to the dewatering. k. Soil type is not specified? City of Cheyenne does not have specification for Imported Soils? According to the geo-tech report, native soils are approved for re-use assuming

3 proper compaction and that they are not classified as restricted or hazardous. Imported materials should meet the grading G specification and be approved by the structural engineer. l. How is this (Subsurface Drainage for Retaining Walls) paid? BME This is subsidiary to the retaining walls. m. Is this (Backfill for Retaining Walls) structural fill? The geo-tech report recommends WYDOT Grading W structural backfill. n. In the specs it says a waste disposal investigation must be done but there is no bid item for this. How is this paid for? This line item was removed as it was included in the City s direct-contract oversight work scope for the removal of the top 2 feet of soil. Bidders are required to acknowledge receipt of this addendum on Page III.2 of their Bid Proposals

4 PART III CITY OF CHEYENNE, WYOMING PROPOSAL FORMS CITY OF CHEYENNE BID PROPOSAL FORM BID NO. S OPEN DATE: May, 2018 TIME: 2:00 PM PROJECT: Civic Center Commons Park TO: GOVERNING BODY CITY OF CHEYENNE (Submit bids to the City Purchasing 2101 O NEIL AVENUE Division, Room 309, Municipal Bldg. CHEYENNE, WY at 2101 O Neil Avenue) 1. Pursuant to and in full compliance with all Bidding Documents, the undersigned Bidder hereby proposes to furnish all the labor and materials and to perform all the work required for the complete and prompt execution of everything described or shown in or reasonably implied by the Bidding Documents, including the Drawings and Specifications, for the work above indicated for the monies stated herein, which includes all State, County and local taxes normally payable in respect to such work when done for an entity not entitled to any exemption from such taxes. The amounts stated include all allowances for profit and overhead, taxes, fees and permits, transportation, services, tools and equipment, labor and materials and other incidental costs. 2. The Bidder has carefully examined the Bidding Documents, including the Drawings and Specifications and the work site, and has fully apprised him/her -self of the conditions affecting the work to be executed, and hereby proposes to construct and complete the above-referenced project, all in accordance with the Bidding Documents, at and for the following sum, as reflected in the total on the attached itemized bid sheets: Base Bid: Alternate A: Alternate B: Dollars ($ ). ($ ) ($ ) Alternate C: ($ ) III.1

5 3. This Bid Proposal is accompanied by the required Bid Guarantee of five percent (5%) based upon the total cost of all items required to be bid. The City of Cheyenne is authorized to hold said Bid Guarantee for a period of not more than sixty (60) calendar days after the opening of the bids for the purpose of evaluating bids prior to award. If awarded the contract for this work, the undersigned Bidder agrees to execute the Agreement and furnish the required Bonds and Insurance Certificates within thirty (30) calendar days from the date of Notice of Award. 4. Attached hereto is an affidavit in proof that the undersigned has not entered into a collusive agreement with any person in respect to this bid or any other bid or the submitting of bids for which this bid is submitted. Dated this day of, (Month) (Year) FIRM NAME: Bidder s Legal Stature: Corporation Partnership Individual Sole Proprietorship L.L.C. Other: State of Incorporation: Bidder s Address: _ Telephone Number: Address: By: (Bidder s Signature) Title: Witness The Bidder acknowledges receipt of the following addenda to the Bid Documents (if none, so state):. Addendum No. Dated III.2