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MONITORING AND REPORTING PROGRAM -3- CITY OF STOCKTON AUSTIN ROAD LANDFILL GROUND WATER TREATMENT SYSTEM AND STORM WATER DISCHARGE SAN JOAQUIN COUNTY emanating or passing through the ground water treatment plant site or the landfill . Storm water monitoring shall include the following: Sampling Constituents Units Type of Sample Frequency pH pH units Grab Quarterly Suspended Solids mg/l Grab Quarterly Specific Conductance ymhos/cm Grab Quarterly Total Organic Carbon mg/l Grab Quarterly RECEIVING WATER MONITORING All receiving water (Littlejohns Creek) samples shall be grab samples. Samples should be representative of the volume and flow in the receiving water. If there is no flow in the receiving water at Station R-1, then the Discharger is not required to sample at Station R-2. Receiving water samples shall be taken from the following: Station Description R-1 Upstream and out of the influence of the discharge to Littlejohns Creek R-2 500 feet downstream of the discharge to Littlejohns Creek Sampling Constituents Units Station Frequency pH pH units R-1, R-2 Weekly Turbidity Turbidity units R-1, R-2 Weekly Specific pmhos/cm R-1, R-2 Weekly Conductivity Temperature OF, OC R-1, R-2 Weekly Dissolved Oxygen mg/1 R-1, R-2 Weekly" EPA Method 601 /"g/l R-1, R-2 Monthl yl,2.3 1) Analyses shall be conducted weekly for four consecutive weeks following initial discharge to the storm drain from the treatment system. 2) After the first four consecutive samples, all other constituents shall be sampled monthly. 3) If any sample shows detectable volatile organics, the Discharger shall immediately resample and reanalyze the effluent for the detected constituent(s) , and shall continue sampling the effluent on a weekly basis until the constituent(s) concentrations are below detection.