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- i <br /> Work PlanofAdditional Site Assessment <br /> 1022 Frontage Road, Ripon, California <br /> C A M B R 1 A ��`�g 2 July 25, 2006, <br /> 5.3 Depth Discrete Groundwater Sampling Using CPT � <br /> Each CPT boring will be advanced to a depth of approximately 80 ft bgs,and if necessary,the borings <br /> may be advanced deeper to vertically delineate petroleum hydrocarbons in groundwater. During <br /> drilling,tip resistance,sleeve friction,and dynamic pore pressure will be electronically recorded on a <br /> continuous log from which the subsurface lithology and stratigraphy will be inferred. Using output <br /> from the electronic log,an adjacent CPT boring will be advanced to and depth-discrete groundwater <br /> samples will -be collected to delineate the vertical extent of dissolved-phase hydrocarbons. <br /> Groundwater sampling will be attempted at depths of approximately 60 and 75'feet bgs using the <br /> Hydropuncho sampling system. The actual_.sample depths.may change based on the stratigraphic <br /> interpretations of the electronic log. Upon reaching the desired sampling depth, the rods will be S i <br /> retracted and screen casing will be exposed to allow groundwater to infiltrate hydrostatically from the s� <br /> formation.After collecting the first groundwater sample,the sampler will be retrieved to the surface, <br /> decontaminated, and prepared for the next Hydropunch°groundwater sample. Upon collecting the <br /> final sample, the borehole will be tremie grouted with neat cement and completed at the surface to <br /> match the existing grade. Cambria's standard field procedures for CPT sampling are presented as <br /> Attachment C. <br /> 5.4 Soil Boring Survey <br /> Upon completing the drilling activities, Cambria will retain the services of a licensed surveyor to <br /> survey the coordinates and elevations of the soil boring. Survey data will be tied to a local benchmark. <br /> 5.5 Chemical Analysis <br /> Soil and grab groundwater samples collected during the site assessment activities will be analyzed for <br /> TPHg by modified EPA Method 8015C, TPHd by modified EPA Method 8015C, TPHmo by <br /> modified EPA Method 8015C, BTEX compounds by EPA method 8021B, and MTBE by EPAt3 <br /> Method 8260B. Samples will be analyzed by a California-certified analytical laboratory. <br /> 5.6 Investigation Derived Waste (IDW) <br /> Investigation derived waste(IDW)generated during the site assessment activities will be temporarily <br /> stored onsite in Department of Transportation-approved 55-gallon drums. Following review of <br /> analytical results.and disposal profiling, the IDW will be transported.to an appropriate facility for <br /> disposal/recycling. ` <br /> 8 <br /> I <br /> r <br />