COMPLIANCE INFO_1968-2006 - Laserfiche WebLink

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SA 1 SANITARY LAND FILLS , 115 )mpo- considerable study, it was found that there was sufficient methane in the air (e gas in these apartments to produce the symptoms noted. 4. form Gas can be controlled by proper design. First, vents can be installed in Some the fill to bleed away the gases when slight pressures develop. These are nothing more than perforated pipes driven into the fill and open to the at- ,d be- mosphere. During the installation of vent pipes in one fill, the workmen would ' is re- touch matches to the"escaping gas in order to heat their lunch-time coffee. trical Structures designed for sanitary fills must be constructed with gas-tight tween membranes beneath the ground floor slab. Ordinarily, a well-constructed earch polyethylene membrane preferably in two layers and laid on a clean sand .orro- fill, will be sufficient. The porous sand fill should be properly vented to is ohms remove the gas that accumulates in it. Unfortunately, in many cases a gravel most fill has been used instead of sand which,although it vents the gas more effec- ement tively, is more likely to puncture the membrane during construction. The igning design should eliminate any pockets, depressions, or unvented dead areas nitary beneath and around the structure where gas might accumulate. With these ere is precautions, gas need not be a hazard, r s . steel Ant of .nhibit CONSTRUCTION PROBLEMS 3 does Soil to �,•. , Construction in old sanitary land fills presents problems which must be A V ` velop- considered in planning the work. Excavation in most sanitary land fills leaves apidly irregular, ragged holes because of the interbedding of the coarser waste t of this materials. There are numerous obstructions from the larger masses such some t•. -, as automobile bodies, tires, stumps, and refrigerators. These may prevent cause the use of continuous excavating machines such as trenchers for laying es. Y gpiP .it, the Deep excavations in the fill cannot be made with the usual scraper m will p type of earthmoving equipment. Instead, the more rugged digging equipment, such as, shovels, draglines, and clamshells and backholes, must be employed and the Is and sizes necessary are somewhat larger than would be utilized for similar ex- ed for cavations in ordinary soil. 'd with A major objection to excavating insanitary landfills is the odors produced. { unless As soon as the fill is open to the atmosphere, fast decomposition is reacti- luately vated and the odors spread rapidly. In a number of such cases, the surround- ncrete ing property owners have obtained injunctions against further construction. A' ; An excavation in one city prompted an investigation by the city council which and, in had repercussions all the way to the state health department. In excavation ormed Work in another sanity land fill the odors were so objectionable that man orogen �' ' j Y �,,• . _ of the workmen became ill. nature In one case, workmen in a pipe trench were asphyxiated by hydrogen sul- tie soil strut- fide in the fill. In• another instance the workmen were made ill by both sthydrogen sulfide and methane. The hydrogen sulfide in the first case was so f ! plosion strong that silver coins in the pockets of the workmen turned black. dscape Foundation construction through sanitary land fills is difficult because of ase. In obstructions such as building debris, stumps, and large metal. If the founds- ' placed tion is driven piling, such obstructions can frequently stop the penetration In one ! t altogether. There are no alternatives other thanto break the obstruction by K,4 ling on � After bL.Aing or to abandon the foundation and try to avoid the obstruction by mov- ing slightly. When a deep foundation is constructed by excavation, such as ` h,