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n <br />I <br />• Strip recorder - Model 142. Span: 1 mV, 10 mV, 100 mV, <br />1 V, and 10 V. Chart speed: 10 speed metric - 0.5, 1, 2, <br />10 cm/min; 0.5, 2, 5, 10 cm/hr. Linear Instruments Corpo- <br />ration. <br />• Gastech - Model GX-3N. Wheatstone bridge detector analyzes <br />for the presence of combustible gas. Calibrated with <br />methane. <br />Gas Stream Characterization <br />Gas stream characterization involves both landfill gas testing and <br />integrated surface sampling. Equipment and sampling procedures for <br />these activities are discussed below. <br />Landfill Gas Testing <br />Equipment. Tedlar bags are the only items required. <br />PJI 9390301 10 <br />I I <br />Well Installation and Sampling. <br />The well borings will be 4 inches in <br />diameter and drilled <br />or hand angered to an appropriate depth <br />(approximately 8 feet). <br />The boring will then be backfilled with <br />1/2 foot of 3/8 -inch or <br />1/4 -inch pea gravel. The well assembly (see <br />Figure 3) will be inserted <br />and the boring will be backfilled with pea <br />gravel to a level of 2 feet <br />above the assembly foot. A bentonite/soil <br />mixture of 1:4 will be <br />added to complete the backfill of the hole; <br />boring cuttings can be used if the clay content is moderately high. To <br />protect the assembly, a <br />plastic 10 -inch vault box is placed on top of <br />the well boring and soil <br />to drainage <br />is mounded to approximately 3 inches above the <br />from the The be <br />grade promote <br />away, probe. well casings will <br />capped immediately after <br />installation. A nipple will be placed in the <br />cap to allow samples to be taken without allowing air to infiltrate the <br />well. <br />PJI 9390301 10 <br />I I <br />