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Section 1 0 • Introduction and Background <br /> degradation may occur up to the groundwater limitations,provided that best practical treatment <br /> and control measures are being implemented, assuring the highest practical quality of effluent is <br /> achieved. If background groundwater quality exceeds the WQGs,then background becomes the <br /> groundwater limitation. In this case, it is generally assumed that no assimilative capacity of the <br /> groundwater exists unless it can be demonstrated that certain beneficial uses of the water are not <br /> or will not potentially be degraded at or in the vicinity of the site. For comparison,the <br /> conservative WQGs for common groundwater monitoring parameters at sites where effluent is <br /> disposed of to land are presented in Table 1-1. <br /> Table 1-1 <br /> Conservative Water Quality Goals <br /> Parameter Water Quality Goal <br /> pH 6.5—8.4(b) <br /> Specific Conductance(µS/cm) 700(b) <br /> Nitrate+Nitrite as N(mg/L) 10(c) <br /> Total Dissolved Solids(mg/L) 450(b) <br /> Total Coliform Organisms(MPN/100ml) 2.2(a) <br /> Barium(mg/L) 1 (c) <br /> Boron(mg/L) 0.7(b) <br /> Iron(mg/L) 0.3 (d) <br /> Manganese(mg/L) 0.05 (d) <br /> Sodium(mg/L) 69(b) <br /> Chloride(mg/L) 106(b) <br /> Sulfate(mg/L) 250(d) <br /> a. Region 5 Basin Plan objective. c. Primary Maximum Contaminant Limit. <br /> b. Agricultural water quality goal. d. Secondary Maximum Contaminant Limit. <br /> In addition to the Antidegradation Policy, the City's WWTF is regulated by the Regional <br /> Board's WDRs Order No. 94-236. These WDRs contains narrative and numerical groundwater <br /> limits for wastewater discharge. These limits state that the discharge shall not cause underlying <br /> groundwater to: <br /> 1. Contain waste constituents in concentrations statistically greater than background water <br /> quality; <br /> 2. Contain chemicals, heavy metals, or trace elements in concentrations that adversely affect <br /> beneficial uses or exceed maximum contaminant levels specified in 22 CCR Division 4, <br /> Chapter 15; <br /> 3. Exceed a most probable number of total coliform organisms of 2.2/100m1 over any seven- <br /> day period; <br /> 4. Exceed concentrations of radionuclides specified in 22 CCR, Division 4, Chapter 15; <br /> 5. Contain taste or odor-producing substances in concentrations that cause nuisance or <br /> adversely affect beneficial uses; and, <br /> 6. Contain concentrations of chemical constituents in amounts that aversely affect <br /> agricultural use; <br /> April 2007 City of Ripon Wastewater Treatment Facility <br /> 1-3 Groundwater Monitoring Well Installation Workplan <br />