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METHODS AND PROCEDURES <br />The following defines those methods and procedures for sampling. <br />Soil Borings and Soil Sampling <br />The proposed soil borings will be drilled using hollow stem auger techniques. It <br />is anticipated that 8 -inch outside diameter hollow stem augers will be used to drill <br />shallow borings; however, the exact auger size may vary due to driller availa- <br />bility. The maximum depth of the borings is expected to be approximately 10 feet. <br />Soil samples will be obtained for chemical analysis at the 2 foot 6 inch, 5 foot, and <br />10 foot depths. Soil samples will be obtained using a California modified split - <br />barrel drive sampler containing 4 clean brass liners. The drive sampler will be <br />driven ahead of the borehole to attain an undisturbed soil sample. Upon removal <br />of the sampler from the borehole, the ends of each brass tube containing the soil <br />samples will be covered with Teflon sheets and capped with plastic caps. The <br />plastic caps will then be taped shut to form an airtight seal. A sample label which <br />includes a unique sample identification number, the sample depth, and the time <br />and date when the sample was obtained will be attached to the brass liner. The <br />soil samples will then be placed on ice in coolers for transport to a California <br />Approved Laboratory. <br />IM • <br />Field documentation will include the completion of boring logs which will note <br />lithology changes indicated by soil sampling results within each borehole, soil <br />sampling intervals, water at the time of drilling and after recharge, and <br />backfilling procedures, where appropriate. Chain -of -Custody forms will also be <br />completed to document each sample obtained. Chain -of -Custody forms will be <br />signed by the engineer or hydrogeologist relinquishing the samples and placed <br />with the samples for transportation to the laboratory. <br />The laboratory selected for sample analysis will be certified by the California <br />Department of Health Services for analysis of Volatile Organic Compounds in <br />both water and hazardous waste samples. Certifications by the California <br />Department of Health Services indicates approval of the on-going system of <br />laboratory, and quality control of the laboratory certified. The laboratory chosen <br />will be asked to submit documentation of protocols used for quality control. <br />Eauipment Decontamination <br />Prior to their initial use and after each subsequent use in other boreholes, all <br />hollow stem augers, drill rods and sampling tools will be steam cleaned to avoid <br />cross contamination. In addition, the California modified soil sampler will be <br />washed in TSP solution and double -rinsed in clean tap water between each <br />sampling interval to avoid potential cross contamination within each borehole. <br />nt. Ae" D. $d4rd P.6. <br />