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Libbev Owens Ford Co. Product Rnao m Svnem InsWianon lune 23, 1997 Page-7- 4.0 PROPOSED MONITOR WELL INSTALLATION Condor proposes to install three (3) monitor wells at the site. Prior to-the monitor well installation, monitor well drilling permits will be obtained from the PHS/EHD. Underground utilities within the work area will be delineated by LOF personnel. The PHS/EHD will be notified of the fieldwork schedule at least 48 hours in advance. 4.1 Drilling Procedures The monitor wells (WI, W2, and W3) will be drilled by Spectrum Exploration of Stockton, California (C57 license 9512268). A Condor geologist will be on site to supervise the drilling, soil sampling, and well installation. The proposed monitor well locations are shown on Figure 6, Appendix A. Prior to commencement of fieldwork, a tailgate safety meeting will be held and a site- specific Health and Safety Plan will be discussed with, and presented to, all crew members for their signatures. A copy of the Health and Safery Plan is contained in the Appendix of this document. The monitor well boreholes will be drilled using 6-inch O.D., continuous-flight, hollow-stem augers to a depth of approximately 20 feet below the ground surface (bgs). The depth to groundwater at the site was approximately I1 feet bgs during the Geoprobe investigation in December, 1996. The augers will be steam cleaned before each borehole is drilled. The soil sampling equipment (i.e., split- spoon) will be cleaned prior to collecting each sample. The cleaning procedures will consist of washing the sampling spoon in a solution of laboratory-grade, non-phosphate detergent and hydrocarbon-free water, and double-rinsing with hydrocarbon-free water. Soil samples will be collected at five-foot intervals using a California-modified, split-spoon sampler fitted with three clean, brass liners. During the sampling, the split-spoon sampler will be driven ahead of the auger. The uppermost liner will be discarded. One sample liner will be used for geological logging and for field screening using an organic vapor analyzer (photoionization detector - PID) and the bottommost liner will be prepared. as described below, for possible shipment to the laboratory. The soil samples will be logged according to the Unified Soil Classification System. Drilling logs will be prepared and will contain field observations including soil type, estimated moisture content. presence of staining or odor, and field PID measurements. L� CONDOR