FROM: Robert Thompson, General Manager
Originator: Kathy Millea, Director of Engineering
SUBJECT:
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CHEMICAL SYSTEMS REHABILITATION AT PLANT NO. 2, PROJECT NO. P2-135
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GENERAL MANAGER'S RECOMMENDATION
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RECOMMENDATION:
A. Find that Chemical Systems Rehabilitation at Plant No. 2, Project No. P2-135 is exempt from CEQA under the Class 1 categorical exemptions set forth in California Code of Regulations Section 15301 and authorize staff to file a Notice of Exemption with the OC Clerk-Recorder;
B. Approve a Professional Design Services Agreement with Lee & Ro, Inc. to provide engineering services for Chemical Systems Rehabilitation at Plant No. 2, Project No. P2-135, for an amount not to exceed $862,328; and
C. Approve a contingency of $86,233 (10%).
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BACKGROUND
Orange County Sanitation District (OC San) stores and uses many chemicals for on-going operations. At Plant No. 2, the Sodium Bisulfite Station was designed for continuous use when OC San regularly disinfected the effluent. From 2000 to 2015, OC San disinfected all effluent, which was sent to the ocean outfall, as required to meet the National Pollutant Discharge Elimination System (NPDES) Permit bacteriological standards. The disinfection process included adding sodium hypochlorite to the effluent to destroy fecal coliform and other disease-carrying microorganisms, and then added sodium bisulfite to dechlorinate the effluent to reduce the impact of sodium hypochlorite on the ocean.
In 2015, OC San received approval from the United Stated Environmental Protection Agency (USEPA) and Santa Ana Regional Water Quality Control Board to stop disinfection. Since 2015, disinfection is now only required for abnormal operational conditions. The NPDES permit still requires OC San to disinfect when using the 78-inch one-mile short outfall, which occurs when the 120-inch five-mile outfall is scheduled for maintenance, or OC San experiences an extreme high...
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