DATE: August 19, 2026
TO: Honorable Mayor and City Councilmembers
FROM: Water Utilities Department
TITLE: CHANGE ORDER NO. 1 FOR PUBLIC WORKS AGREEMENT FOR SIMPSON MECHANICAL FOR THE PURE WATER OCEANSIDE ADVANCED WATER PURIFICATION FACILITY CHEMICAL PIPING
RECOMMENDATION
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Staff recommends that the City Council approve Change Order No. 1 to the Public Works Agreement with Simpson Mechanical, in the amount of $108,413, for a total contract amount of $302,395, for construction of the Pure Water Oceanside (PWO) Advanced Water Purification Facility (AWPF) Chemical Piping and authorize the City Engineer to execute the change order.
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BACKGROUND AND ANALYSIS
Pure Water Oceanside is a 4.5 million-gallon-per-day (MGD) Advanced Water Purification Facility that treats recycled water from the San Luis Rey Water Reclamation Facility through ultrafiltration, reverse osmosis, and ultraviolet light advanced oxidation. It was the first operating advanced water purification facility in San Diego County, reaching operation in December 2021. Purified water is conveyed to injection wells and recharges the Mission Basin, where it blends with native groundwater before extraction and additional treatment at the City's Mission Basin Groundwater Purification Facility for distribution to customers.
The AWPF is now in regular production, continuously injecting purified water into the Mission Basin. Reliable operation of the plant's chemical feed systems is required to maintain the water quality parameters necessary for injection and to avoid interruptions to plant operations.
On April 20, 2026, an informal notice to bidders was submitted and closed on July 2, 2026. The work included chemical piping repair consisting of three components: (1) general chemical piping repairs throughout the AWPF, excluding abatement, which is being procured separately by the City under a separate contract; (2) replacement and relocation of the sulfuric acid metering pump skid and repair o...
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