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ARCADIS BBL Mr. Gray <br /> September 1, 2007 <br /> Prior to conducting subsurface activities,the site must be identified using white paint <br /> and an Underground Service Alert(USA)ticket for the site must be obtained by <br /> calling USA at least 48 hours prior to drilling activities. Additionally, a private third- <br /> party utility locator will screen all proposed boring locations to determine the location <br /> of nearby underground utilities. <br /> Soil Boring Installation <br /> All subsurface activities will be conducted in the presence of a licensed PG&E <br /> electrician. All soil boring locations will be hand cleared to 5 feet below ground <br /> surface with an air-knife/vacuum truck or hand auger prior to drilling.The use of an <br /> air-knife is recommended for areas with a high density of underground conduits in <br /> the investigation area. <br /> Following hand clearance, each boring will be advanced using hydraulic direct push <br /> equipment provided by the subcontracting drilling company. Soil boring installation <br /> may also be completed using hollow-stem auger drilling methods if required by site <br /> lithology.All drilling equipment will be connected to the substation grounding grid <br /> using a grounding cable connected by PG&E personnel. Direct-push drilling will <br /> produce continuous, relatively undisturbed soil samples. If hollow-stem auger <br /> methods are used, soil samples should be collected every five feet using a stainless <br /> steel split-spoon sampler. Soil samples will be logged for lithologic properties <br /> (including soil type, color, moisture content, etc.) using the Unified Soil Classification <br /> System (USCS)as outlined in ASTM D-2487. In addition, observations will be noted <br /> regarding odor, staining, and relative volatile organic compound concentrations as <br /> measured with a photoionization detector(PID)from soil head space. All soil <br /> samples will be logged by experienced field personnel, under the supervision of a <br /> California Professional Geologist. <br /> Prior to use, all non-disposable field sampling equipment will be decontaminated in <br /> the following manner: <br /> o Non-phosphate detergent and distilled water wash (removing large <br /> particulates with brush) <br /> o Distilled water rinse <br /> o Solvent rinse(acetone) <br /> o Double-distilled water rinse <br /> Page: <br /> 3/5 <br />