ARCHIVED REPORTS_DRAFT ENVIRONMENTAL IMPACT REPORT

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Impacts on Monthly Residential Sewer Rates Table 50: Potential Environmental Impacts Associated with Microfiltration/Reverse Osmosis Treatment of Wastewater The current analysis of monthly sewer rate increases that would be associated with the �� construction and operation of the two alternative control measures is focused on increases to Potential MF/RO Environmental Impacts current City residential ratepayers. An analysis of fee increases to current non-residential6 Ultimate disposal of brine and residuals requiring the energy intensive processes of evaporation, ratepayers and all future ratepayers is outside the scope of the current effort;however,socio- crystallization,and off-site transport. economic impacts to all current and future ratepayer categories are considered in the following Potential need for additional treatment of brine waste to remove heavy metals and other contaminants section(Modeling of Economic Impacts on the Community). Limiting the current discussion to from the aqueous phase prior to crystallization and disposal of waste. increases in residential ratepayer fees follows the common practice of estimating the economic Increases in air emissions due to the substantial power requirements of MF/RO. impact of a project on the average household within a community. The effluent-to-land disposal Increases in air emissions from truck and rail traffic to dispose of crystallized brine waste. and MF/RO project costs presented in Table 47 and Table 49,respectively,can be used to (t)Metcalf and Eddy,2003. estimate a monthly sewer rate increase that would be assessed to each existing City residential ratepayer was an alternative to be implemented today,as shown in Table 51. Based on the current monthly residential sewer feel of$31.40(as of March 2007),customers in this rate Compliance with Laws and Regulations category would pay monthly fees of$37.96 or$52.53,respectively,if an effluent-to-land State and Federal water quality laws require that discharges not result in an exceedance of water disposal or MF/RO control measure was implemented today. It is important to note that these quality standards. The portion of WQCF effluent that would undergo MF/RO treatment is estimated monthly fee increases represent only the portion of an alternative's cost assessed to expected to meet all relevant water quality objectives and standards,with the possible exception current residential ratepayers to pay for approximately 22 percent of the construction and of Thermal Plan objectives. Any near-field thermal issues would be mitigated as necessary(e.g., operation/maintenance costs of an alternative control measure(see Table 46). This percentage is implementation of a cooling tower to lower effluent temperature prior to its discharge into the calculated from the 9.87 MGD(ADWF)share of the total 27 MGD(ADWF)capacity of the San Joaquin River)as part of the WQCF's overall compliance with the Thermal Plan. The WQCF at build-out to be paid for by current ratepayers,and then multiplied by the 60 percent of MF/RO treatment alternative is not expected to result in far-field exceedances of applicable WQCF capacity allocated to residential users(9.87/27 x 60%=21.93%). water quality objectives or standards. Table 51: Estimated Monthly and Annual Residential Sewer Rate Increases assessed to Current SOCIO-ECONOMIC IMPACTS OF ALTERNATIVES FOR MAINTAINING EXISTING Ratepayers to provide Debt Service for Alternative Control Measures WATER QUALITY Current Residential Estimated Current Residential As described in the previous section,the analysis of costs,benefits,and potential impacts of Ratepayer Share of Ratepayer Increases maintaining existing surface water quality in the San Joaquin River by maintaining WQCF Total Annual effluent mass loading to the river at the currently permitted 9.87 MGD(ADWF)level as WQCF Alternative Control Measure Project Cost Monthly Increase Annual Increase discharge capacity increases to 27 MGD(ADWF)is based on two potential alternatives: Effluent-to-Land Disposal $1,700,000 $6.56 $78.72 effluent-to-land disposal and MF/RO. Both of these alternative control measures will result in a Microfiltration/Reverse Osmosis $5,500,000 $21.13 $253.56 substantial increase in monthly sewer service fees paid by users of the City's treatment facilities. Furthermore,the annual costs of each alternative,and their associated monthly sewer rate increases,can be translated into a set of economic indicators that describe revenue and The monthly sewer rate increases shown in Table 51 that would be assessed to current employment losses in the WQCF service area as a means of modeling the overall socio- residential ratepayers was an alternative control measure to be implemented would provide debt economic cost of implementing and operating either alternative control measure. As a means of service for only 22 percent of the total cost of an alternative. The remaining 78 percent of an limiting the number of projections made in the course of estimating alternative control measure alternative's cost would be borne by existing non-residential and future residential and non- project costs and impacts to ratepayers in the WQCF service area,a decision was made to residential ratepayers as shown in Table 52. In the case of current non-residential ratepayers, estimate all costs and impacts in present worth dollars(as of March 2007)and apply them to the their monthly sewer fees would also increase;however,a detailed accounting and projection of City's most recent population estimate(65,0765 residents as of January 1,2007). This section monthly rate increases for existing City commercial,industrial,and septage users,as well as discusses the impacts of each alternative in terms of monthly sewer rate increases and overall customers in the City of Lathrop and Raymus village is outside the scope of the current effort. socio-economic impacts to the WQCF service area. Debt service for approximately 63 percent of an alternative's cost(see Table 46)will come from 6 Non-residential ratepayers include City of Manteca commercial,industrial,and septage users,as well as customers in the City of Lathrop and Raymus Village. 5 City of Manteca Economic Development Division. 'Current sewer fees cover the cost of Phase III improvements and treatment capacity of 9.87 MGD. City of Manteca Antidegradation Analysis 105 June 2007 City of Manteca Antidegradation Analysis 106 June 2007