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Under the current contract agreement with AES, sixteen (16) 6 -inch Butterfly control yak .es were slated for replacement in the overall project under bid item Number 1. Each RO treatment train is constructed with 16 control valves, for a total of 64 valves for the four RO treatment trains (4 x 16 = 64) As stated, the project called for 16 of the valves to be replaced and for 48 of the current 64 control valves to be refurbished and reused. Upon further inspection of the 43 control valves set for refurbishment an additional 16 are in.. need of replacement. This brings the total number of control valves to be replaced to 32 for the entire project. The additional cost for the 16 additional valves is S16,480.00. (See attached Exhibit A for breakdown.) Staff has also determined that 9 (nine) -conductivity sensors and 1 (one) pH sensor are obsolete and are in need of replacement as pan of this project. These sensors were not included as part of the original bid. The sensors are part of the overall monitoring and control system for the 4 RO treatment trains. The additional cost for replacement of the ten sensors is 35,943.75 (See attached Exhibit B for breakdown.) RO treatment trains #1 and #2 currently are fitted with 2 -inch concentrate reject valves. RO treatment trains #3 and #4 are fitted with 3 -inch concentrate reject valves. The concentrate reject valve directs the RO concentrate from the treatment train into the concentrate treatment and disposal system. It is staff's desire to standardize all four treatment trains with 3 -inch concentrate reject valves. This conversion was not part of the original bid. The additional cost for converting the 2 -inch valves on trains #1 and #2 is 32400.00. (See attached Exhibit C ) As part of the overall approved 51,034,822.00 contract for the replacement of the RO Membranes and ancillary equipment, bit item # 11 provided for a project contingency of 525,000.00. Staff has reviewed this amount of contingency and is requesting Board approval to increase the project contingency from 2.5% to 5%. This would increase the project contingency from 325,000.00 to 550,000.00. The following is a summary of Change Order Number 1: Original Contract Price Desert tion Purchase of 16 (sixteen) additional 6 (six) inch Butterfly control valves Purchase of 10 (ten) monitoring, and control sensors Coni ersion of two 2 -inch re ect valves to 3 -inch Continuenc increase 4mended Contract Price as a result of Chancre Order Number 1 RECOMMENDATION Amount 31,034,822.00 316,480.00 $5,943.75 32400.00 525,000.00 51,084,645.75 It is the recommendation of the Staff of the Department of Utility Services that the Board of County Commissioners approve Change Order Number 1, for an amended contract price of S1,084,645.75. FUNDING SOURCE 471-000-169-377.00 — Renewal and Replacement ( R&R) FEBRUARY 5, 2002 -94- 1