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3.0 AMBIENT AIR QUALITY <br />3.1 SAMPLING LOCATIONS <br />Ambient air was sampled from February 23 through 26, 1988 according to <br />the workplan and protocol presented in the ASWAT proposal (see Appen- <br />dix A). Two 24-hour ambient air sampling devices were placed on the <br />perimeter of the site; one upwind on the northern part of the western <br />side of the site and one downwind on the southeast corner of the site. <br />These locations (see Figure 1) were selected based on the site topog- <br />raphy, meteorological data, and the land use pattern. In addition, a <br />wind directionally controlled ambient air sampler was placed immedi- <br />ately adjacent to each 24-hour sampler. <br />3.2 SAMPLING EQUIPMENT <br />The equipment used to monitor ambient air quality is described in the <br />ASWAT proposal (see Appendix A). <br />3.3 SAMPLING AND ANALYSIS PROCEDURES <br />Ambient air samples were collected over three 24-hour periods from <br />February 23 through 26, 1988. Each sample was collected 9 feet above <br />the ground in a 10 -liter Tedlar bag following the protocol specified <br />in the Guidelines. <br />While the ambient air samples were being collected, wind speed and <br />direction were continuously measured and recorded at the meteorologi- <br />cal station. The location of the meteorological station was moved <br />closer to the center of the landfill because the proposed location was <br />adjacent to the fill disposal area. Wind data are summarized in <br />Appendix G. Immediately after each 24-hour period, the samples were <br />removed from the samplers. Within 72 hours after collection, each <br />sample was analyzed by Central Coast for the 10 VOCs specified in <br />Guidelines. Analytical procedures are included in Appendix D. <br />PJ9 9390405.000 3-1 <br />Rev. 0 09/07/88 <br />Emcon Associates <br />