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

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Innovative Design and its engineering/sail scientist subcontractor (Landis, Inc.) submitted a preliminary design report/proposal to County staff containing three design "Steps". These Steps (or design alternatives) are summarized below: • Step 1 -Provides flow equalization to 6000 gpd for four consecutive days only, uses existing septic tank primary treatment components and existing front lawn nitrification field • Step 2 -Provides 3000 gpd "Living Machine"-type secondary treatment technology and flow equalization to 6000 gpd for four consecutive days, uses existing septic tank primary treatment components and existing front lawn nitrification field Step 3 -Provides 6000 gpd septic tank primary treatment, 6000 gpd "Living Machine"- type secondary treatment technology, flow equalization to allow up to 12,000 gpd for four consecutive days, and subsurface disposal capacity of 6000 gpd on the Vincent property Steps 1 and 2 would use the existing treatment system components buried in the front lawn of the NHSC and Step 3 would use the Vincent property. The consultant ultimately recommended that the County implement Step 2 and cited the reasons below: • the probable maximum average daily flow from the facility (after retrofitting the facility with low flaw plumbing fixtures) should not exceed 3000 gpd • peak flows have historically exceeded the existing system design flows by approximately 50% and average daily flows by nearly 300% • peak flows are projected to be +/- 6000 gpd at maximum building use with reduced flow plumbing fixtures • provides a treatment capacity and a subsurface discharge capacity of 3000 gpd to address average flows of up to 3000 gpd and will address peak flows of up to 6000 gpd for four continuous/consecutive days • provides the least cast initial investment using advanced treatment technology (and would allow the potential for additional subsurface discharge capacity by expanding to Vincent tract as necessary). Attachment A is the complete report from the Consultant including their proiected timeline. Orange County Environmental Health and Engineering staff evaluated the consultant's proposed Steps (design alternatives) in light of state and local permitting requirements and taking into account existing conditions and proposed uses at the NHSC. Environmental Health staff determined that Steps 1 and 2 were insufficient to meet local or state regulatory (permitting) requirements associated with expanded building use for the following reasons: