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../ MONITORING AND REPORTING PROGRAM -3- CITY OF STOCKTON REGIONAL WATER QUALITY CONTROL PLANT SAN JOAQUIN COUNTY RECEIVING WATER MONITORING All receiving water samples shall be grab samples, collected at mid-depth, in the mid-stream of the river. Receiving water sampling may be postponed or eliminated if hazardous water conditions prevent safe access to the sampling locations. Receiving water monitoring shall include at least the following: Station Description R-1 San Joaquin River @ Bowman Road, 8.0 miles south of discharge R-2 San Joaquin River @ Highway 4, 0.5 miles south of discharge R-3 San Joaquin River @ Deep Water Channel, 2.0 miles north of discharge R-4 Light 45, 2.5 miles north of discharge R-5 Light 41, 3.5 miles north of discharge R-6 Light 36, 5.0 miles north of discharge R-7 Light 24, 7.3 miles north of discharge R-8 Light 18, 9.0 miles north of discharge Sampling Constituents Uaiu Station Frequency Dissolved Oxygen mg/l R-1 thru R-8 pH Number R-1 thru R-8 Turbidity NTU R-1 thru R-8 Temperature OF R-1 thru R-8 Electrical Conductivity @25°C µmhos/cm R-1 thru R-8 Ammonia mg/l R-1 thru R-8 Un-ionized Ammonia as N (calculated) mg/l R-1 thru R-8 Hardness mg/l R-1 thru R-8 Monthly' Alkalinity mg/l R-1 thru R-8 Monthly' During the portionof the year from 1 June through 30 November or when dissolved oxygen is less than 5 mg/1, Stations R-1 through R-8 shall be sampled weekly at low slack tide, when practical (between 8:00 and 11:00 a.m. for dissolved oxygen and temperature) . During the portion of the year from l December through 31 May, receiving water Stations R-2 through R-5 shall be monitored at least monthly at low slack tide, when practical (between 8:00 and 11:00 a.m. for dissolved oxygen and temperature). Temperature and pH shall be determined at the time of sample collection for the calculation of Un-ionized Ammonia. Report as both total and unionized ammonia.