Laserfiche WebLink
i <br /> I <br /> Geosyntec O <br /> consultants <br /> 5. WORK PLAN FOR CPT-13 AREA INVESTIGATION <br /> The objective of the CPT-13 area investigation is to delineate, laterally and vertically, <br /> the extent of toluene in soil and groundwater. <br /> 5.1 Scope of Work <br /> The investigation of the CPT-13 area will' consist of soil and groundwater sampling <br /> with an adaptive approach. Proposed initial .locations, shown in Figure 3, are <br /> approximately 10 feet from CPT-13 .in all directions. Soil samples will be collected at <br /> various depths between 15 and 40 ft bgs and analyzed onsite by a mobile laboratory. <br /> Deeper samples will be collected if necessary.to delineate the vertical extent of toluene <br /> impact. Step-out borings will be completed as needed to delineate the lateral extent of <br /> toluene in soil. Potential step-out locations are shown in Figure 3 but are subject to <br /> change based on field conditions. <br /> 5.2 Pre-Investigation Activities <br /> Prior to the start of field activities, Geosyntec will perform the following: <br /> • Update the Site Health and Safety Plan (HASP), as needed, in accordance with <br /> local, state, and federal requirements; <br /> • Obtain boring permits from. the San Joaquin County Environmental Health <br /> Department; <br /> • Notify Underground Service Alert a minimum of two business days prior to the <br /> commencement of any subsurface work and conduct a utility clearance using a <br /> private utility locator to identify subsurface utilities and other potential <br /> obstructions.. Proposed investigation locations will be adjusted based upon the <br /> USA and private utility clearance. <br /> 5.3 Investigation Activities <br /> Soil borings will be advanced by a licensed California C-57 drilling contractor. <br /> Geosyntec personnel will provide oversight of the drilling operations and will log soil <br /> cores according to the UnifiedSoil Classification System (USCS). Soil samples will be <br /> collected at various depths between 15 and 40 ft bgs. The samples will be analyzed for <br /> VOCs by a California Department of Health Services certified mobile analytical <br /> laboratory using EPA Method 8260. Soil cuttings will be contained in 55-gallon drums <br /> pending analysis and disposal. <br /> Monitoring Well Installation Report 8 21 January 2013 <br />