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1 <br />is it examined in the manner required under §75 Subpart D. <br />' The above notwithstanding, the following actions will be taken to <br />sample for, and rectify any problems if found, with respect to <br />' explosivity of the atmosphere remaining in the disposal area: <br />' 1. Explosive oases other than methane. The requirements of <br />§75.301-5 through §75.301-8 will be adhered to in the course <br />' of backfilling the disposal area. Sampling of the atmosphere <br />in the disposal void will be made from the two bleeder holes <br />' described above, on a monthly basis. The samples will be <br />analysed for carbon monoxide, hydrogen, hydrogen sulfide, <br />acetylene, propane, and methyl acetylene-propylene-propodiene <br />' (MAPP) as required in §75.301-5. In the event that the <br />standards for these compounds are not met in a test, the gas <br />' will be retested. If the failure is confirmed, the voidspace <br />in the disposal area will be purged with air or other <br />appropriate gas using the disposal pipe network, until <br />conformance with the requirements of §75.301-5 is obtained. <br />' 2. Methane at the seals. Pursuant to the requirements of §75.305 <br />and §75.306, tests of the methane content of the air adjacent <br />' to the disposal bulkhead seals will be made by a qualified <br />person weekly, with appropriate recordkeeping and reporting. <br />3. Methane in the disposal area. The methane concentration in <br />' the disposal area will be sampled on a monthly basis at the <br />bleeder vents at ground surface. If the methane content of <br />' the air in the void exceeds 1.0 per centum of methane, then <br />the air in the void will be purged using the disposal line as <br />described above. <br />lJ <br />' Adrian Brown Consultants -20- 1145/900820 <br />1 <br />