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4.0 PROPOSED FIELD INVESTIGATION ACTIVITIES/PROCEDURES <br /> The following sections outline the field procedures and protocols to be <br /> used to implement the scope of work. The objective of these activities is to <br /> further characterize of the impacted soil and groundwater by drilling <br /> additional soil borings, installing monitoring wells within the borings, and <br /> collecting soil samples from the full vertical profile for geophysical soil <br /> properties. Installing monitoring wells at the Site will allow groundwater <br /> samples to be collected that are more representative of Site conditions and <br /> during multiple monitoring events from the same location. Additionally, <br /> the wells will provide information that will aid in the evaluation of <br /> potential additional remediation options. <br /> LESCO proposes to install four monitoring wells at the Site to determine <br /> current soil conditions and evaluate groundwater characteristics and <br /> conditions at the Site (Figure 4). The locations on Figure 4 are <br /> approximate and may be slightly altered to adjust to Site conditions such <br /> as traffic patterns and location usage. Currently,negotiations between <br /> ERM and the Port of Stockton are taking place to access offsite wells for <br /> monitoring water quality and groundwater elevation measurement. If <br /> access to these wells is unable to be obtained, LESCO proposes to <br /> construct an offsite well to aid the investigation. <br /> 4.1 PRE-FIELDWORK ACTIVITIES <br /> Prior to initiating field activities,necessary permits will be obtained from <br /> San Joaquin County Environmental Health Department (SJCEHD). This <br /> Workplan, a master file record information form,Site mitigation fees,and <br /> well permit applications will be submitted to SJCEHD prior to conducting <br /> drilling activities. Additionally, Underground Service Alert subscribing <br /> companies will be notified and a utility locator will be employed to <br /> confirm locations of underground utilities prior to intrusive activities. <br /> Upon completion of the investigation,soil and groundwater results will <br /> be submitted to SJCEHD and RWQCB for review. The RWQCB will <br /> review the data and provide their recommendations for any future <br /> actions. <br /> 4.2 SOIL CHARACTERIZATION <br /> For the purpose of monitoring well construction,soil borings will be <br /> drilled using a truck-mounted drill rig equipped with 6-or 8-inch <br /> ERM 7 LESCO,INC/0067373.01-N..ba 2007 <br />