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Page 3.5 SECTION 3-ENVIRONMENTAL MONMORING <br /> RECEIVING WATER AT BOTH UPSTREAM AND DOWNSTREAM LOCATIONS <br /> i <br /> Sampling <br /> Constituents Units Station Frequency <br /> I <br /> I <br /> pH pH units Grab Weekly <br /> Turbidity Turbidity units R-1,R-2 Weekly <br /> Specific Conductivity gmhos/cm R-1,R-2 Weekly <br /> Temperature of°C R-1,R-2 Weekly <br /> Dissolved Oxygen mg/I R-1,R-2 Weekly'-2 <br /> EPA Method 601 µg/I R-1,R-2 Monthly'2-3 <br /> i 'Analyses with a monthly sampling frequency shall be conducted weekly for four consecutive <br /> weeks following initial discharge to the storm drain from the treatment system. <br /> • 2After the first four consecutive samples, all other constituents shall be sampled monthly. <br /> 3 I any sample shows detectable volatile organics,the Discharger shall immediately resample and <br /> reanalyze the effluent for the detected constituent(s), and shall continue sampling the effluent on a <br /> weekly basis until the constituent(s) concentrations are below detection. <br /> i 3.5 LEAK DETECTION SYSTEM <br /> The recommended design includes a leak detection system of collection lysimeters running below <br /> the liner barrier layer parallel to the leachate collection pipe network. Collection lysimeters will <br /> i drain to a low point beneath the low point of the landfill liner to a leak detection standpipe <br /> (sampling station). A portable pump will be used for sampling the leak detection standpipe. <br /> Sampling stations will be monitored monthly. The inspector will measure the quantity of any liquid <br /> present. The rate of leakage, if any, will be calculated in gallons per acre per day (gpad) by <br /> calculating the changes in liquid volume between monitoring events. The purpose of this leak <br /> j detection monitoring also serves the purpose of monitoring the vadose zone and leachate. <br /> I 3.6 LANDFILL GAS MONITORING <br /> Gas Control is defined under Section 17705 of the California Code of Regulations, Title 14, <br /> Chapter 3, Article 7.6. Specifically, it states that 'Where the Enforcement Agency, the local fire <br /> control authority, or the Board has cause to believe a hazard or nuisance may be created by <br /> landfill decomposition gases, they shall so notify the owner. Thereafter, the site owner shall <br /> cause the site to be monitored for presence and movement of gases, and shall take necessary <br /> action to control such gases ... The monitoring program shall be developed pursuant to the <br /> ° specifications of the above agencies ... The agency may waive this requirement if satisfactory <br /> c evidence is presented indicating that adjacent properties are safe from hazard or nuisance caused <br /> by methane gas movement." <br /> Discussions with personnel from the California Integrated Waste Management Board, the Local <br /> Enforcement Agency, and the City of Stockton have indicated that there have not been gas <br /> migration problems associated with the landfill. Combustible Gas Indicator readings taken by <br /> personnel from the California Integrated Waste Management Board have shown that there have <br /> r <br /> I <br /> R.W.Beck and Asses <br /> City of Stockton 1811.002 <br />