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MW-10 (Shallow) <br /> This well will be located approximately 500 feet north of MW-1RD. It will <br /> be drilled to assess the lateral extent of the COCs in the groundwater. <br /> MSN-11 (Deep) <br /> This well will be located just east of MW-2 and MW-5. MW-11 (deep) will <br /> be completed in the second alluvial aquifer between the first and second clay <br /> layers. Any piezometric level differences between this deep well and shallow <br /> wells MW-2 and MW-5 would indicate vertical gradients existing between the <br /> first alluvial aquifer and the deep aquifer. <br /> 4.1.2 Monitor Well Design and Installation <br /> The logging, supervision of drilling, and completion of all borings and <br /> monitoring wells will be performed under the supervision of registered <br /> geologist or engineer. <br /> The shallow monitoring well (MW-10) boring will be drilled using hollow <br /> stem auger (HSA). In the shallow boring, soil samples will be collected every <br /> five feet, or when geologic material changes, to the depth of the first clay <br /> layer, and two foot into the first clay layer. Boring logs will be prepared <br /> based on observation and description of the soil samples using the Unified <br /> Soil Classification System (USCS). <br /> Z:TROP-PRA 1999%1524-p\de1ivb1e\rpt-1524.Ldm <br /> 8 <br />