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0 <br /> PHASE 2 INVESTIGATION OF EXTENT OF CLOSURE CAP <br /> AND HEALTH AND SAFETY PLAN <br /> CORRAL HOLLOW SANITARY LANDFILL <br /> PURPOSE <br /> The purpose of Phase 2 investigation is to determine where closure cap must be extended to ensure <br /> that all refuse along the eastern side of the Corral Hollow Landfill is beneath closure cap. Phase 2 <br /> investigation will also confirm the results of the Phase 1 investigation with regards to the apparent <br /> lack of refuse east of the access road on the east side of the landfill. The extent of refuse and <br /> closure cap will define the areas over which the closure cap will be extended. <br /> BACKGROUND <br /> Phase 1 investigation was conducted on September 2005 to investigate whether refuse and/or <br /> closure cap was present beneath the drainage ditch on the eastern side of the Corral Hollow <br /> Landfill. Five excavations were dug on both sides of the access road (Figures 1 and 2). The <br /> excavations east of the access road (away from the landfill)were dug between 8 feet and 12 feet <br /> deep, with the exception of Excavation No. 1 which was dug to four feet. The excavations west of <br /> the access road (toward the landfill)were dug to a depth between 6 and 14 feet. <br /> No refuse was found east of the access road; however, refuse was found beneath the drainage ditch <br /> where no closure cap was present. At the excavations where refuse was found,the soil cover was <br /> not more than 2.5 feet deep. <br /> PHASE 2 INVESTIGATION AREA <br /> In this Phase 2 investigation, additional areas along the eastern portion of the landfill will be <br /> excavated to determine the horizontal extent of the closure barrier and refuse if the refuse extends <br /> beyond the closure cap. The lack of refuse east of the access road, as determined in Phase 1 <br /> investigation, will also be confirmed. <br /> The areas that will be investigated for the extent of refuse in Phase 2 are (Figure 2): <br /> 1. North-eastern corner, extending west from the access road and excavation No 1. <br /> 2. South-western corner of the eastern side of the landfill. Excavations will extend both <br /> south-east and south-west, north of the retention pond. <br /> 3. Eastern edge of the access road. Trenches will be dug every 100 feet along the eastern side <br /> of the access road. <br /> 4. Phase 1 Excavation No 1 near the north-western corner of the road will be re-excavated to <br /> a depth of 12 feet as requested by Water Board staff. <br /> Phase 2 Investigation Solid Waste/Public Works <br /> Corral Hollow Sanitary Landfill Page 1 of 5 San Joaquin County—January 12,2006 <br />