Agenda - 06-02-2004-9d - Laserfiche WebLink

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Executive Summary -Innovative Design, Inc.. and its consultant Landis, Tnc. have conducted an evaluation ofthe wastewater alternatives for the Northern Services Center. A preliminary site plan has been developed by Innovative Design that will allow for both expansion of the parking and the continued use of the existing wastewater nitrification fields at the center. The wastewater flow data and water flow data for the Northern Services Center was provided to Landis by the Orange County Health Department, Landis has determined that the existing wastewater problem is primarily due to unusually high peals flow rates. Landis has also determined that the existing wastewater nitrification fields may be more than sufficient for the proposed use of the facility if the peak flow rates can be controlled. The consultants have made the following technical findings: • Tlne existing wastewater pernnit is based upon an average daily flow of 2,400 gallons per day (GPD). • The wastewater flow records from March 1999 through .January 2004 indicate that the average flow rate for the facility has been 1,324 gallons per day (GPD). • New commodes and urinals are proposed to be included in the improvements to the center and they will reduce the average flow rate from the facility by about 30 %, • The facility has had a problem of peak wastewater flows that have reached approximately 3,800 gallons per day (GPD), • The proposed expansion in uses in the center should increase the average flow rate for the facility to about 2,062 gallons per' day (GPD). • The proposed expansion in uses in the center should increase the peak flow for the facility to about 5,980 gallons per day (GPD). The State On-Site Wastewater regulations allow for the use of actual wastewater flows in lieu of the general flow rates for various types of uses in the regulations. The actual wastewater flow from the facility is the preferred method to plan improvements and expansion to an existing facility. hn addition to the wastewater flow analysis, the architects have evaluated the building to determine the maximum allowable number of people, types of use, and estimated wastewater flow with water conservation features,. This architectural analysis is based upon the maximum use of the building under the State Building Code and projected uses from information given the architects from the future building occupants, The results indicated that the maxinnmr use of the building should on average generate wastewater flows of about 3,000 gallons per day (GPD), All of the above analysis has led to the recommendation that improvements to the wastewater system be based upon logical steps as they become necessary over time. The first two of the steps are based upon the most cost effective means to solving the existing problems and needs for the facility, Based upon the wastewater flow data and the architectural analysis, it does not