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Pirondini,Tony,2006. Personal communication regarding 2004-2005 Central Valley Clean Appendix A: Diffuser Temperature Increment Water Agency Mercury Study with City of Vacaville Water Quality Laboratory Supervisor,November 2006. Analysis Quinn N.W.T.and A.T.Tulloch,2002. San Joaquin River diversion data assimilation,drainage Using the mass(energy)balance equation,the difference between discharge and ambient river estimation and installation of diversion monitoring stations. Final report. CALFED Bay- temperatures can be calculated to achieve desired temperature differences between plume and Delta Program,Sacramento,California. 211 pp. ambient river. Resource Management Associates(RMA),2006. Near and Far Field Dilution Analysis of the Manteca Wastewater Discharge,October 2006. T =Te + (TeMuent-Te )=Te + —-T, g plume p S D D S S Tchobanoglous,G.and E.D.Schroeder,1985. Water Quality,Addison-Wesley Publishing Where Tpi,nne,Tup,Teffluent,and S are the in-plume,ambient river,and effluent temperatures;and Company,Reading,MA. in-plume dilution,respectively. U.S.Environmental Protection Agency(USEPA),2002. National Recommended Water Quality T...--TeD=S (T...-T D Criteria:2002. Office of Water,Office of Science and Technology,EPA-822-R-02-047, November 2002. Where Tpi.,-T„p is the desired difference between in-plume and ambient river. U.S.Geological Survey(USGS),1995. Groundwater Atlas of the United States:California, For a temperature differential between the plume and ambient river to be less than 1.0°F the Nevada Chapter HA 730-13,1995. differential between the effluent and ambient river temperatures in degrees Fahrenheit should be less than the calculated minimum dilution of the fully developed plume(RMA,2006). For example,if the minimum in-plume dilution is calculated to be 5,the effluent temperature would have to be within 5.0°F of the ambient river temperature for the in-plume temperature to be within 1.0°F of the ambient river temperature. Likewise,a similar calculation can be made to determine the increment between the discharge and ambient river temperatures to obtain a 4°F temperature differential in the fully developed plume. If the difference between the discharge and ambient river temperatures in degrees Fahrenheit is within four times the in-plume dilution, the temperatures within the plume will be within 4°F of the the ambient river temperature. By knowing where objectives should be met and the available dilution at that point,the allowable temperature differential between the effluent and the ambient river may be calculated. Using the relation that the dilution,S,equals the dilution ratio,D,plus one,the relationships are presented as the following: Tea-Tupsnesm=S=D+1 is the location of the 1°F temperature differential Tea-Tupsne—=4•S=4(D+1)is the location of the 4°F temperature differential The minimum dilution from the diffuser occurs a short distance downstream of the outfall due to the tidal effects and timed discharge of effluent. If the allowable effluent temperature is limited so that the differential between the effluent and ambient temperatures in degrees Fahrenheit is less than the minimum dilution,then there will be less than a 1°F temperature differential between the centerline of the plume and the ambient river for the river transect where the dilution is at the minimum. . The results for the diffuser scenario are for the fully developed plume and the analysis assumes complete mixing through the water column at the point of discharge. As the effluent leaves the individual ports of the diffuser and the initial momentum driven mixing occurs,the temperatures will be higher than the analysis would indicate,but the area is much smaller because the plume has not yet fully formed. The plume area starts at the diffuser as the area of the ports and increases to the area of the fully formed plume,typically over a distance equal to five river depths. City of Manteca Antidegradation Analysis 125 June 2007 City of Manteca Antidegradation Analysis 126 June 2007