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KLEINFELDER 4 FIELD ACTIVITIES Tasks 4.1 through 4.4 will be conducted to gather information for the baseline groundwater evaluation for the site. 4.1. PERMITTING AND PREFIELD ACTIVITIES The San Joaquin County Department of Environmental Health Department (EHD) requires completion of a well permit, and payment fees prior to installation of monitoring wells. Meinfelder will prepare drillingiboring permit applications for submittal to EHD along with the required fees. The permits must be approved prior to drilling activities and sampling. EHD usually requires up to approximately two weeks to issue the permits. The drilling subcontractor will contact Underground Service Alert 48 hours prior to conducting fieldwork to notify local utilities of our proposed subsurface assessment. 4.2. MONITORING WELL INSTALLATION Three (3) groundwater monitoring wells will be installed at the proposed locations shown on Plate 2. The wells will be installed to assess groundwater quality, groundwater flow direction and gradient during the time of sampling. The proposed locations are based on estimated groundwater flow towards the west and the current locations of the sprayfield and retention ponds. One well is proposed to be installed in an estimated upgradient location of the sprayfield and retention ponds. Two wells will be located in estimated down-gradient locations of the sprayfield and retention ponds. Please refer to Plate 2 for the proposed monitoring well locations. Please note the proposed monitoring locations are based on groundwater flow directions noted in the vicinity of the existing sprayfield and retention ponds. Actual groundwater flow direction at the site however, may not necessarily be the same. Groundwater flow directions may significantly fluctuate due to groundwater pumping, rainfall, groundwater recharge, etc. Therefore, the RWQCB may require installation of additional wells if the groundwater gradient is found to vary from the initial estimated groundwater flow direction. The well borings will be drilled with a truck mounted drill rig equipped with 8-inch hollow stem augers. During advancement of the soil borings, soil samples will be collected at five-foot intervals for lithologic classification. Lithologic classification will be based on the Unified Soil Classification System (USCS) and logged under the direct supervision of a California registered professional geologist or civil engineer. All downhole equipment used in the drilling and installation procedures will be cleaned and/or decontaminated as described in Appendix A. 50890.E01/ST05R358/JDZ:ly Page 4 of 12 2005,Kleinfelder,Inc. April 29,2005