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The Corral Hollow Sanitary Landfill is located on Corral Hollow <br />Road approximately five miles south of Tracy, California (Figure <br />1). The site is a Class III landfill which will stop accepting <br />waste in May 1995. In accordance with closure regulations, a <br />network of perimeter gas monitoring wells is being installed by <br />SCS Engineers. In December 1994, SCS Engineers installed GW -3, <br />GW -4, GW -5, and GW -6. The seven scheduled well locations are <br />shown on Figure 2. Due to the rupture of the Texaco oil pipeline <br />during drilling, installation of GW -1, GW -2, and GW -7 was <br />delayed. Alternative locations for GW -1 and GW -7 were proposed <br />in a letter to the California Integrated Waste Management Board, <br />dated January 13, 1995. These wells are scheduled to be <br />completed as soon as we receive approval of the alternate well <br />locations and field conditions improve. The wells are to be <br />monitored quarterly for methane. <br />For the quarterly gas monitoring in January 1995, the four <br />completed wells were tested. In addition, the previous method of <br />testing a two -foot -deep hole was used at the proposed locations <br />for GW -1, GW -2, and GW -7. The following table shows the results <br />of the monitoring for January 30, 1995. <br />