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0 <br />SAMPLING METHOD <br />C_ J <br />A rectangular area of the fabrics approximately 6 ft x 5 ft will be exposed to allow the collection of <br />a section approximately 3 ft x 4 ft in area. This exposure area will provide approximately one foot <br />of undisturbed fabric around the sampled fabric. Site safety protocol will be followed during the <br />sampling. <br />The depth of the fabric will be determined by careful hand -digging at several locations within the <br />sampling area prior to removing significant portions of the operations soil layer. At this time, it is <br />anticipated that the operations soil layer will be removed by manual labor using shovels and <br />brooms. The soil from the sampling area will be stockpiled adjacent to the sampling area. <br />Once the fabric is exposed, the sample of the geo-net and the non -woven geotextile fabric will be <br />removed using metal snips or equivalent. The exposed HDPE will then be inspected for damage. <br />If the HDPE is intact, it will be covered with a single piece of GCL overlapping minimum of six <br />inches around all edges of the rectangular sampling area (Figure 3). The purpose of the GCL is <br />to prevent rainwater from carrying soil into the geonet drain layer as the rain percolates through <br />the operations layer. After the HDPE liner is covered with GCL, the operations layer soil will be <br />replaced. <br />Sampling of the fabric and restoring the operations layer is expected to be completed in one day, <br />which will be selected to ensure no rain during the procedure. Under no circumstances will the <br />HDPE liner be left exposed overnight. <br />This work will be in the presence of an engineer licensed in the State of California, who will <br />document the removal of the sample and certify the condition of the HDPE liner beneath the <br />fabrics until the liner is again covered. <br />SAMPLING AREA REPAIR CONTINGENCY <br />If, in spite of precautions, the HDPE liner is damaged during the collection of the fabrics samples, <br />the area will be secured with protective fabrics and repair scheduled. The HDPE liner will be <br />repaired by seam welding or welding a cap of compatible HDPE liner material over the damaged <br />area according the damage being repaired. Repair will be completed and tested, and certified by <br />a third -party CQA firm, such as Vector Engineering, in accordance with the repair procedures <br />used during the installation of Module 4. Documentation of this repair will be submitted to the <br />LEA and the Regional Water Quality Control Board with certification by that firm. <br />N:\1 North County\Airspace\Work Plan -Fabric Samp-NC-3-25-07.doc <br />Work Plan -Fabric Sampling at Module 3 Solid Waste/Public Works <br />North County Sanitary Landfill Page 2 of 2 San Joaquin County — March 28, 2007 <br />