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.J <br />vicinity of U.S.#1/Riverside Avenue to pumping station N2. <br />In order to establish estimated sewage flows for the system <br />conception design, the area of each subshed was determined in <br />acres and a value of 1000 gallons per day per acre (GPDPA) <br />was used. The areas considered are gross which include <br />roads, environmental lands, etc, and it is estimated that a <br />density of (3) housing units per acre or (6) mobile home <br />units per acre is fair. At 300 GPD per housing unit and/or <br />150 GPD per mobile home unit, the resultant design sewage <br />flow per acre would be 900 GPD. In the case of commercial <br />use, it is estimated that 25% of the site will be covered by <br />building and a sewage flow value of 0.10 GPD per square foot <br />will result in a design sewage flow of 1089 GPD per acre. <br />Based on these examples and assumptions, it is our <br />professional opinion that the design value of 1000 GPD per <br />acre is reasonable and acccuate for the purposes of this <br />report. <br />The seven (7) exhibits show the proposed arterial "core" <br />sewage conveyance system which primarily consists of pumping <br />stations and force mains. The system sizing and layout is <br />based on the results of a computer analysis to balance <br />various force main sizes with sewage flows, head conditions <br />and pump motor horse powers. A copy of the North County Sub - <br />regional Sewer Project preliminary pipe sizing calculations <br />-15- <br />