Laserfiche WebLink
n <br />0 <br />n <br />0 <br />n <br />Iii <br />u <br />u <br />u <br />0 <br />L <br />n <br />L <br />l -_- <br />Ci <br />0 <br />Integrated Surface Sampling <br />Equipment. The integrated surface sampler is a portable self-contained <br />unit with an internal power source (see Figure 6 for detail of pump <br />unit). The integrated sampler consists of the following: <br />• Power source <br />• Funnel (collection probe) <br />• Diaphragm pump <br />• Tedlar bag <br />• Air flow control orifice flow meter <br />A wind utility system and a dual recorder are also necessary. <br />Sampling Procedures. The Corral Hollow Sanitary Landfill has been <br />surveyed to determine locations of potential gas seepage through the <br />landfill cover. This survey was used to determine the 50,000 -square - <br />foot grid to be sampled. Figure 5 illustrates a typical walking pattern <br />for collecting a sample from such a grid. <br />The 10 -minute -average wind speed suitable for this sampling procedure is <br />less than 5 mph. Surface samples will be retaken if the average wind <br />speed exceeds 5 mph or if the instantaneous wind speed exceeds 10 mph. <br />Surface sampling will only be performed when the site is dry or after <br />there has been no rain for 72 hours. <br />An integrated surface sampler will be used to collect the surface air <br />sample. During sampling, the probe will be held within 3 inches of the <br />landfill surface to collect a sample of approximately 8 liters. The <br />sample collection flow rate will be set at approximately 333 cubic <br />centimeters per minute; however, the actual flow rate will be <br />recorded. A technician will walk the grid following a course of <br />approximately 2,600 linear feet over a continuous 25 -minute period. The <br />PJI 9390301 11 <br />