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JOSEPH W.SCHULKE.P.E. SCHULKE, BITTLE & STODDARD, L.L.C. 10DAH B.BITTLE.P.E. WILLIAM P.STODDARD.Ph.D.,P.E. CIVIL & STRUCTURAL ENGINEERING • LAND PLANNING a ENVIRONMENTAL PERMITTING March 2, 2016 Arjuna Weragoda, P.E. Capital Projects Manager Indian River County Department of Utility Services 1801 27th Street Vero Beach, FL 32960 Re: Central Wastewater Treatment Facility Bid Recommendation Dear Mr. Weragoda: Please accept this summary evaluation of the bids for the Central Wastewater Treatment Facility and recommendation to award the contract. Generally, the bids came in significantly higher than the initial estimate for the work. The initial estimate was $151,735:00; while.the lowest-adjusted (see below-explanation) base-bid for the Central Wastewater Treatment Facility (CWWTF) was $300,116.00. The initial estimate was based on the unit prices for the South Regional Wastewater Treatment Facility (SWWTF), which had a similar rehabilitation work completed in 2012/ 2013 The cost per SF of the rehabilitation work to the concrete surfaces of the headworks for the previous SWWTF project was $20.25 per sf, and the recent low bid for the CWWTP project came in at approximately $27.00 per sf or 33% higher. However, a contingency was added to the initial estimate to account for discrepancies due to inflation and other factors. Therefore, the bid price for that portion of the work for the CWWTF came in close to what was initially estimated. The discrepancy in costs is due to the replacement costs for the screw gates. The initial preliminary estimate was prepared with limited knowledge and without an evaluation by this consultant of the condition of the plant. The estimate assumed that only the two (2) screw gates leading to the two main channels of the headworks would need to be replaced. However, it was apparent during the engineering evaluation and design of the rehabilitation project that all eight (8) screw gates would have to be replaced with slide gates. Further, while there are less expensive gate options, the IRCDUS operations staff requested during the design of the project that only CoPlastix slide gates were to be specified in the bid — as these have been incorporated in other recent IRCDUS rehabilitation projects, and staff had found these to be reliable, trouble-free systems. In addition, incorporating these gates on all projects going forward .provides compatibility of materials / components_on all IRCDUS VW T facilities, so parts will be interchangeable. Unit prices between CoPlastix gates and other alternative gates differ by as much as $10;000 per gate (from $20,000 per gate for CoPlastix to $10,000 per gate for other types). The change in the gate quantity and manufacturer accounts for approximately $150,000 in additional costs (including additional costs for mobilization and bonding, which costs are dependent on the total contract amount). Below is my review of the bids for the Central Wastewater Treatment Facility(CWWTF). It should be noted that two bidders submitted exceptions to the plan specifications and submitted bids with alternate materials; however, only one of these two bidders - Florida Design Drilling Corp. - submitted a relatively competitive bid. Also, the bid form included two add alternates for minor surface repairs and re-painting of the exterior of the structure. IRC will have to decide if it wants to include these additional costs for this work, which was not included in the original scope or 1717 INDIAN RIVER BLVD.,SUITE 201.VERO BEACH.FLORIDA 32960 TEL 772/770-9622 Fax 772/770-9496 EMAIL info@sbsengineers.com Certification of Authorization No:00008668 60