Okaloosa County BOCC — June 16, 2015 — Award Recommendation - Consultant

POLYENGINEERING, INC, ARCHITECTURE. ENGINEERING. SOLUTIONS. May 26, 2015 Mr. Jeff Littrell, Director Okaloosa County Water and Sewer Department 1804 Lewis Turner Boulevard, Suite 300 Fort Walton Beach, FL 32547 Subject: Engineers Recommendation of Award Camp Rudder Pump Station Project Okaloosa County Bid No. RFB WS 29-15 Dear Mr. Littrell, Equipment only bids were received and opened for the Camp Rudder Pump Station project at 2:15 p.m. on May 20, 2015. The Board of County Commissioners received three (3) bids for the project. The project was bid with a Total Base Bid and two (2) optional bid items. The Base Bid was for a complete fiberglass wetwell, two submersible wastewater pumps, guiderails, ductile iron discharge piping, control panel and backup level monitoring devices. The optional bid items were as follows: Alternate Bid Item No. 1 — Upgrade to 316 stainless steel discharge piping Alternate Bid Item No. 2 — Add 5-year extended warranty to soft starts Okaloosa County Water & Sewer is under contract with the Federal Government to transmit wastewater from Auxiliary Field No. 6 (Camp Rudder) to the County’s Arbennie Pritchett Water Reclamation Facility (APWRF). The remote location, extremely long forcemain (approximately 18 miles) and the high head/low flow pumping condition makes this a very unique and difficult pumping scenario with a very limited selection of pumps capable of suitable performance. As a result, no bids were received based around pumps on the Okaloosa County Water and Sewer pre-approved pump list. According to the project specifications (Section 11145, 2.1-E.2.a), the Okaloosa County Water & Sewer Engineering Department is tasked with making the final determination of whether the submitted pump is to be considered an approved equal. To assist in that determination, Polyengineering offers the following analysis of the submitted pumps. Pumps submitted by the three vendors are as follows: Pump & Process Equipment, Inc. proposed a Fairbanks-Morse Pump Gilbert Pump & Mechanical, Inc. proposed a Grundfos Pump Jim House & Associates, Inc. proposed a Flygt Pump PHONE 850-609-1 100 Fax 850-609-1 101 PosT OFFICE Box 84 | FL AA COO 1543 |02 SUNSET LANE CIvIL, MECHANICAL, ELECTRICAL, ENVIRONMENTAL ENGINEERING WWW .POLYENGINEERING . COM SHALIMAR, FLORIDA 32579 ARCHITECTURE * ENVIRONMENTAL CONSULTING AND LAB TESTING ® PLANNING Due to the complexities of the pumping condition, the remoteness of the pump station and the fact that all three pumps would be operating to the far left limits of their pump curves, it is important to analyze the pumping characteristics of each pump throughout a range of conditions. The following table displays the shutoff head info for each pump. If the pressure in the line at the pump station reaches shutoff head, the pumps will cease to pump at all. As the data shows, the Fairbanks-Morse pump has the least amount of safety factor in this area and the Flygt has the most room to handle intermittent increases in pipeline head. Such intermittent increases could be caused by a buildup of air from malfunctioning air release valves (31 total in forcemain) or foreign objects in the line. Proposed Fairbanks | Proposed Grundfos | Proposed Flygt Shutoff Head (ft) 187 198 206 Normal Operating Head (ft) 168 175 180 Normal Operating Flow (gpm) 321 332 343 Allowable Head Increase in Line Before Flow = 0 GPM (ft) 19 23 26 Due to the long forcemain, large number of air release valves and the remote location of the pump station, it is prudent, reasonable, most advantageous and in the best interest of the County to select the pump with the largest range between operating head and shutoff head (Flygt) to allow County Staff more time to identify problems in the line and remedy them before any sewage backup occurs at Camp Rudder. Based on the analysis set forth above, Polyengineering, Inc. finds that Jim House and Associates is the lowest, most responsive bidder and recommends that the Bo