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---- - — --- -- k" KEEfNFEL-E}ER <br /> 4 MONITORING WELL INSTALLATION WORKPLAN <br /> This workplan describes a scope of work for the installation of three monitoring wells in <br /> the vicinity of the wastewater ponds, to address monitoring well installation associated <br /> with the groundwater monitoring requirements included in the of the RWQCB Revised <br /> Monitoring and Reporting Program No. 93-112. <br /> 4.1 PERMITTING AND PRE-FIELD ACTIVITIES <br /> The San Joaquin County Environmental Health Department (EHD) requires completion <br /> of a well permit, and payment fees prior to installation of monitoring wells. Kleinfelder <br /> will prepare drilling permit application for submittal to EHD along with the required fees <br /> and this workplan. The permits must be approved prior to drilling activities and <br /> sampling. EHD usually requires up to approximately two weeks issuing the permits. <br /> Kleinfelder will contact Underground Service Alert 48 hours prior to conducting fieldwork <br /> to notify local utilities of the proposed subsurface assessment. <br /> 4.2 MONITORING WELL INSTALLATION <br /> Three (3) monitoring wells will be installed at the proposed locations shown on Plates 2 <br /> and 3. The proposed well locations have been selected to assess groundwater <br /> conditions in the vicinity of the evaporation and percolation ponds south of the facility and <br /> to estimate groundwater gradient direction during the time of sampling. The locations <br /> were chosen based on an anticipated groundwater flow direction to the north in the <br /> vicinity of the ponds and on reasonable access. <br /> The soil borings will be drilled with a truck mounted drill rig equipped with 8-inch hollow <br /> stem augers to a total depth of approximately 60-feet bgs. During advancement of the <br /> soil borings, soil samples will be collected at 5-foot intervals for lithologic classification. <br /> Lithologic classification will be based on the Unified Soil Classification System (USCS). <br /> Equipment used in the drilling and installation procedures will be cleaned and/or <br /> decontaminated as described in Appendix A. Kleinfelder does not propose to perform <br /> laboratory analyses on any soil samples at this time. <br /> Based upon available information, we anticipate groundwater in the vicinity of the project <br /> site to be present at a depth of approximately 50 feet below the ground surface, with a <br /> groundwater flow direction to the north. <br /> 67451.WP1/ST06R295/FB:ly Page 5 of 14 <br /> ©2006 Kleinfelder, Inc. March 31,2006 <br />