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i. Valley Water Treatment L./ Page 3 <br /> Work Plan-Monitoring Well Construction <br /> GPE Project No.480.2 <br /> June 16,2005 <br /> 4.2 Soil Boring Installation <br /> A hollow stem auger drilling rig, owned and operated by C-57 licensed water <br /> well contractor will be used to drill four, 8-inch diameter soil borings <br /> (designated MW-1, through MW-4) to a total depth of 20 feet. During drilling <br /> soil samples will be collected at 5-foot intervals. <br /> All soil cuttings will be placed in drums and temporarily stored, pending <br /> profiling and determination of proper disposal methods. <br /> %. <br /> 4.3 Soil Sampling and Analyses <br /> The soil borings will sampled at 5-foot intervals for geological and possible <br /> �- analytical evaluation using a 2.0-inch diameter by 1.5-foot long (i.d.) hammer <br /> driven California Split Spoon sampling device fitted with three 2 by 6 inch <br /> brass or stainless steel liners. The soil sample collection procedure will be as <br /> '^ follows: The end of each sample tube removed from the split spoon will be <br /> sealed with aluminum foil, capped with plastic end caps, secured with tape, <br /> labeled and placed in a cooler at 4° Celsius for transport to the laboratory <br /> using Chain of Custody protocol. Chain of Custody (CofQ forms are <br /> documents used to track the handling of samples. All dates, times, persons <br /> and companies handling the samples will be listed from the time the sample <br /> is collected to its ultimate disposal. All soil sampling equipment will be <br /> decontaminated between uses by washing using a steam cleaner. Nitrile <br /> gloves will be worn during sample collection and changed between collection <br /> of each sample. <br /> L. A detailed log will be made of each boring. The information to be noted <br /> include such data as sample depths, blow counts from hammer driven <br /> sampling devices, horizons of detectable contamination (detected by field <br /> '— methods), soil classification utilizing the Unified Soil Classification System <br /> and sediment description (color, texture, composition, hardness, moisture <br /> content, and post-depositional changes that have occurred in the sediments). <br /> At least three soil samples from each boring will be submitted to Argon <br /> L. Laboratories of Ceres (State Certified Laboratory #2359) and tested for the <br /> presence of benzene, toluene, ethylbenzene and xylene (BTEX by method <br /> EPA 8020), and gasoline range total petroleum hydrocarbons analyses (TPH- <br /> G) by EPA method 8015m- <br /> LN <br /> 015m-v 2937 Veneman Ave.,#B240 Geo-Phase Environmental Inc. Phone(209)569-0293 <br /> Modesto,CA 95356 Fax(209) 569-0295 <br />