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�F. r ^€. a' Page 13 July 12, 1991 Job No.400511-El 7.0 DRILLING AND SAMPLING PROCEDURES Boreholes for the monitoring well installations will be drilled following the general procedures outlined in the Standard Operating Procedures (SOP) shown in Appendix A. SOP 5200 details hollow-stem auger techniques. No fluids will be added to the boreholes during the drilling operations. The boreholes will be advanced to approximately 100 feet for monitoring wells. Lithologic logging for all boreholes will follow ASTM D 2488 for visual classification of soils using the United Sails Classification System(USCS)and will be performed by a DERS field geologist under the supervision of a Registered Geologist or Certified Engineering Geologist, The procedures are outlined in SOP 6100, All lithologic logs will be signed by the field geologist and by a Registered Geologist or Certified Engineering Geologist. Soil samples will be collected at 5-foot depth intervals from the monitoring wells beginning at a depth of five feet. One sample in every 10-foot interval will be submitted for .analysis. Soil samples for analytical testing and use in lithologic logging%t i': be obtained using a split-barrel sampler. SOP 1403 presents the procedures that will be followed when using the split-barrel sampler. Proper packaging and shipping procedures for soil samples are provided in SOP 8001. All drilling equipment will be decontaminated between ground-water monitoring well boreholes. Sampling;equipment will also be decontaminated between uses to prevent cross-contamination. SOP 7001 provides proper decontamination procedures. The boreholes for the vapor wells will be advanced to approximately 40 feet,65 feet, and 90 feet for each well cluster. The deepest boring in every other cluster will be sampled at 5-foot intervals. A minimum of two (2) samples per each screened interval in the cluster will be submitted for analysis. These samples will include the sample with the highest field organic vapor reading in each screened interval and the deepest sample in the boring. A boring log will be made as described above for the deep boring in each cluster. This information will be used to determine the screen interval for wells in the cluster. 8.o WASTE DISPOSAL PLAN This section provides guidelines for the handling of wastes generated from the field activities. All soils brought to the surface will be screened with an instrument capable of analyzing volatile organic vapors by photoionization detection (PID) methods. See SOP 9002 for the proper operating procedures for a PID: Soils with instrumental analysis readings of less than 100 ppm TPHg will be stockpiled on-site for later chemical analysis and municipal disposal. Soils with instrumental analysis readings greater than