FROM: James D. Herberg, General Manager
Originator: Kathy Millea, Director of Engineering
SUBJECT:
title
ACTIVATED SLUDGE-1 AND SECONDARY CLARIFIER REHABILITATION, PROJECT NO. P1-140
end
GENERAL MANAGER'S RECOMMENDATION
recommendation
RECOMMENDATION:
A. Approve a Professional Design Services Agreement with HDR Engineering, Inc., to provide engineering services for Activated Sludge-1 and Secondary Clarifier Rehabilitation, Project No. P1-140, for an amount not to exceed $18,462,443;
B. Approve a contingency of $1,846,244 (10%); and
C. Find that Activated Sludge-1 and Secondary Clarifier Rehabilitation, Project No. P1-140 is exempt from CEQA under the Class 1 categorical exemptions set forth in California Code of Regulations Section 15301 authorize staff to file a Notice of Exemption with the OC Clerk-Recorder.
body
BACKGROUND
The Orange County Sanitation District (OC San) has three biological secondary treatment facilities at Plant No. 1, one of which is the Activated Sludge-1 (AS-1) Facility. This process removes suspended and dissolved organic material using microorganisms, enabling OC San to meet ocean discharge permit limits and the required influent quality for the Groundwater Replenishment System (GWRS). The facility consists of a blower building, aeration basins, secondary clarifiers, a return activated sludge (RAS) pump station, and various utilities. This critical facility was built in 1973, expanded in 1999, and partially rehabilitated in 2008.
RELEVANT STANDARDS
* 24/7/365 treatment plant reliability
* Comply with California Government Code Section 4256 to engage the best qualified firm "on the basis of demonstrated competence and qualifications" and negotiate fair and reasonable fees"
* Meet volume and water quality needs for the GWRS
PROBLEM
Multiple components of the AS-1 Facility are nearing the end of useful life and require replacement or rehabilitation. Major mechanical equipment in the blower buil...
Click here for full text