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Mr. Joseph Lipka April 10, 2017 • Page 2 Gas monitoring well testing procedures are as follows: • Connect sample tubing, open test valve; observe pressure and record data. • For probes 20 feet deep or less, turn on sample pump, observe and record methane, oxygen, and carbon dioxide gas concentrations, when readings have stabilized for 30 seconds. • For probes more than 20 feet deep, turn on sample pump, extract a minimum of one probe volume, observed and record methane, oxygen, and carbon dioxide gas concentrations, when readings have stabilized for 30 seconds. • Close test valve, disconnect sample instruments and secure sample location. SCS monitored structures by testing random selected locations where methane gas would most likely accumulate(e.g., electric outlets and junction boxes, conduits,drains, cabinets and closets). Other required monitoring documentation(e.g., sampling personnel,date, time and meteorological conditions) is shown on the attached testing data tables. GAS MONITORING PROBE TESTING iIn accordance with the approved testing schedule, all perimeter compliance GP probes are to be tested at a minimum, on a quarterly basis. On March 1, 3 and 22, 2017, all accessible perimeter Gas Monitoring Probes defined as GP-01 through GP-28R were tested for the presence of LFG. Test results (Table 1) indicated that all GP probes tested exhibited methane gas concentrations below the LEL(5 percent by volume)or no methane gas was detected. These results indicated that as of the date of this report, the subject site perimeter probes are in compliance with the requirements of Title 27 CCR Article 6. SCS is scheduled to perform second quarterly monitoring of 2017 (April through June) of the GP probes by the end of the month of June 2017, or more frequently as directed by RSI. ON -SITE INTERIOR STRUCTURE TESTING In accordance with the approved testing schedule, the interiors of on-site structures are to be tested at a minimum, on a quarterly basis. On March 31, 2017, on-site structures (i.e., landfill office, portable office, scale house, locker room and supply room) were tested for the presence of methane gas. In each structure, random selected locations (i.e., electrical outlets and junction boxes, conduits, drains, floor cracks, etc.)were tested. Test results (Table 2) indicated no methane gas was detected at any accessible location tested. •