Okaloosa County BOCC — April 15, 2014 — Action Item Printout

BOARD OF COUNTY COMMISSIONERS AGENDA REQUEST DATE: April 15, 2014 TO: Honorable Chairman and Members of the Board FROM: Jeff Littrell SUBJECT: Layne Christensen Company Change Order #3 for Del Cerro II Well DEPARTMENT: Water and Sewer BCC DISTRICT: 1 STATEMENT OF ISSUE: Approve Change Order #3 of Layne Christensen Company, Inc.’s Contract # C13-2026-WS, which would add additional scope of work to the construction of the Del Cerro II Public Water Supply Well. BACKGROUND: Okaloosa County entered into contract with Layne Christensen Co., Inc. on April 3, 2013 for the construction of the Del Cerro II Public Water Supply Well in the amount of $934,895. During the test well construction and testing, it was observed that the water bearing formation exhibited low yield and sand. Additional pumping and analysis was performed and a determination was made to continue with the development of the permanent well despite these obstacles in hopes that despite the low yield, a satisfactory well could be obtained though there was a real possibility that a gravel pack (filter) and screen or other measures might be required to abate the sand. The full diameter well has now been completed and test pumping has showed an improved yield, though the formation still produces sand. Change Orders #1 and #2 have been executed, for $20,640 and $10,740, respectively. The change orders are for the extended pumping and unforeseen circumstances with the surface casing. To remedy the high sand concentration and allow the well to be developed to produce water of such quality required by a public water supply well, a gravel pack (filter) and screen is required and has been recommended by the Contractor with concurrence by the project’s engineer. In addition to this requirement, realizing the well hydraulic losses that will be caused by the filter and screen, it is recommended that the capacity of the well be decreased from a minimum of 1,000 gpm to 750 gpm. 750 gpm is a satisfactory capacity for the needs of our system. Further, because much of the sizing and procurement of the electrical equipment is dependent on the measured hydraulics of the well which has been delayed due to the unforeseen problems, an increase in overall project time is requested by the Contractor and concurred by the project’s engineer. The above items will be accomplished via Change Order #3, which would add an additional $99,530 in scope of work. The resulting new contract price would then be $1,065,805. OPTIONS: Approve or deny. RECOMMENDATION: OCWS requests BCC approval to authorize the Chairman to execute Change Order #3 with Layne Christensen Company on Contract #C13-2026-WS for the Del Cerro II Public Water Supply Well, which authorizes the gravel pack and screen at a cost of $99,530, increases the total new contract price to $1,065,805, revises the minimum capacity of the well from 1,000 gpm to 750 gpm, and revises the contract time by adding 153 days to Substantial Completion and 122 days for Final Completion. RECOMMENDED BY: APPROVED BY: Ernie Padgett, County Administrator