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The total amount of revenue required from rates is allocated between amounts to be recovered from the billable parameters of flow, BOD, SS and accounts/units. Allocation is accomplished by the development of percentage allocations among the four parameters. The four parameters and the allocations are based on principles and methodology found in the State of California Revenue Program Guidelines. The use of these industry standard principles and methods ensures that revenue requirements are equitably recovered from classes of customers in proportion to the cost of serving those customers. The general cost of service process includes the following steps: 1. Identification of annual revenue requirements; 2. Allocation of annual revenue requirements to billable parameters; 3. Development of unit costs of service for each billable parameter; and 4. Distribution of costs to customer classes. Annual revenues required from rates were identified in Section 3. Development of unit costs of service and distribution of costs to customer classes is presented in this section. The billable parameters are flow, BOD, SS and accounts/units. Each of the billable parameters is described below. Flow. Flow is the rate at which wastewater is discharged to the sanitary sewer. Units of measure include gallons per day (gpd), million gallons per day (mgd). Flow is often expressed in terms of volume. Volume units of measure include hundred cubic feet (hcf) and million gallons. The two terms are used interchangeably with their corresponding unit of measure. For example, average monthly wastewater discharge for a customer could be expressed as a volume of 6 hcf or a flow of 148 gpd. BOD. BOD is an acronym for Biochemical Oxygen Demand. BOD is one of the two primary contaminants removed during the treatment process. SS. SS is an acronym for Suspended Solids. SS is one of the two primary contaminants removed during the treatment process. Account/Billing Unit. The source of the wastewater discharge with a connection (direct or indirect) to the sanitary sewer. Dwelling units in multiple family dwellings are connected to the sanitary sewer through an account with a direct connection to the sanitary sewer. Account/Dwelling Unit charges are based on costs of serving every account regardless of the flow or strength (BOD and SS levels) of wastewater discharge. 4-1 11'H'1 I Nji iu vicYY 111, ,^ a ^:. ci'd/ VIsc c4 ;oi'du I'd ci'i V h " -Ih eV Is-11h'ju; ; Nj, Yhc III IIIGfl ci'cs -po,iiia ,I a Y hc a r�G c4 Y his ulorolIIiiu;�i^d,