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1 <br /> The following measures will be taken by Geo-Phase Environmental Inc to ensure that a high quality study is <br /> conducted and that cross contamination does not occur <br />' 21 Equipment <br /> Soil borings will be drilled with hollow stem auger drilling equipment, owned and operated by V&W Drilling <br />' and under the supervision of a registered geologist Soil samples will be collected using a 2 inch (i d} <br /> sampling device, lined with 2 x 6 inch brass sample tubes <br /> 1 <br /> 22 Boring Logs <br /> A detailed log will be made of each boring The information to be noted includes sample depths, blow counts if <br /> continuous coring device is not used, horizons of detectable contamination (detected by field methods), soil <br />' classification utilizing the Unified Soil Classification System and sediment description (color, texture, <br /> composition,hardness, moisture content, and post-depositional changes that have occurred in the sediments) <br />' 23 Cross Contamination Prevention <br /> All sample equipment(coring sampler, brass tubes etc) and auger(drilling rod, drilling bits, & auger, etc) will <br /> be thoroughly cleaned before being used and between uses Wash water may be containerized in DOT approved <br />' 55 gallon drums, labeled, and stored on site until disposition can be arranged Plastic gloves will be worn <br /> during sample collection and changed between all samples <br />' 24 Chain of Custody <br /> Chain of Custody (CofQ forms are legal documents used to track the handling of samples All dates, times, <br /> persons and companies handling the samples will be listed from the time the sample is collected to its ultimate <br /> disposal A CofC form will be filled out for all samples collected <br /> 25 Sample Analysis <br />' Samples will be analyzed for benzene, toluene, ethyl benzene and total xylenes (BTEX), using EPA method <br /> 8020, and for total petroleum hydrocarbons as gasoline and gasoline and as diesel, using EPA method <br /> 5030/8015m and 3540/8015m The analyses will be performed by Sherwood laboratories of Hilmar , <br />' California State Certification#1400 <br /> 26 Soil Boring Installation <br />' The soil borings will be drilled using hollow stem auger drilling equipment Soil cuttings will either be <br /> containerized in DOT approved 55 gallon drums and labeled, or lain on and covered by plastic sheeting, and <br /> 1 stored on site until their proper disposition can be arranged Soil samples will be collected for geological and <br /> analytical evaluation at five foot intervals Soil samples will be collected in 6 0 inch brass liners using a 2 0 inch <br /> modified California split spoon sampler All soil samples will be sealed with aluminum foil, capped, labeled <br /> and placed in a cooler at 4°Celsius for transport to the laboratory following Chain of Custody protocol <br />' Because every soil sample collected will not be submitted for laboratory analysis, a screening process will be <br /> used to gather additional information through field observation noting sediment type, especially grain size, clay <br />' content, moisture content, and visible evidence of contamination, i e , color change due to reduction of iron or <br /> discoloration from hydrocarbons and other pollutants <br /> The soil borings will be closed as follows after the last soil sample has been collected the augers removed from <br /> the boring and 25 pounds of bentonite will be poured into the boring and hydrated with clean tap water The <br /> remaining borehole will be closed by pouring a neat cement grout through the annulus up to grade <br /> 2937 Veneman Ave,#B240 Geo-Phase Environmental Inc Phone (209) 569-0293 <br /> Modesto, CA 95356 Fax(209) 569-0295 <br />