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INFORMATION SHEET -2- <br /> CITY OF STOCKTON <br /> AUSTIN ROAD LANDFILL <br /> GROUND WATER TREATMENT SYSTEM AND STORM WATER DISCHARGE <br /> SAN JOAQUIN COUNTY <br /> need continue to be tested during compliance monitoring, if clearly identified <br /> in previous testing. <br /> Twenty-four hour composite sampling for the chronic effluent toxicity monitoring <br /> is recommended for this discharge because no significant short-term variation is <br /> expected for this effluent discharge and this will reduced the number of tests <br /> required by the Discharger. If effluent toxicity monitoring data indicates <br /> little or no operational or seasonal variation exist in the effluent discharge, <br /> the Discharger may propose to change from composite sampling to grab sampling <br /> The Discharger proposes to sample two hours after the initial startup; once per <br /> day thereafter for four days; weekly thereafter for three weeks; and monthly <br /> thereafter. The proposed frequency of routine monitoring is daily for pH and <br /> specific conductivity and monthly for Biological Oxygen Demand (BOD) , suspended <br /> solids, and volatile organics. It is recommended that the Discharger install an <br /> automated sampling system for the treatment plant in order to facilitate <br /> collecting composite as well as grab samples. <br /> The purpose of this routine monitoring is to insure that the ground water <br /> treatment plant discharge does not adversely impact downstream biota in <br /> Littlejohns Creek. If routine monitoring show detectable concentrations of <br /> volatile organics, the frequency of monitoring will be increased to weekly until <br /> the constituent(s) concentrations are below detection. <br />