ARCHIVED REPORTS XR0000090 - Laserfiche WebLink

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shipment to a California Department of Health Services (DHS)-approved laboratory At the time of sampling, each sample was logged on a Chain-of-Custody record that accompanied the sample to the laboratory Soil samples selected for analysis had the request for analysis ' noted on the Chain-of-Custody form The remaining soil samples were sent to the laboratory on a hold-for-analysis basis Before use at each borehole, the soil sampling equipment was steam cleaned washed in an P g , ' AlconoxTM solution, and rinsed in distilled water The two-inch-diameter liners, to be placed in the split-spoon samplers for soil sample collection will have previously been steam-cleaned ' Drill cuttings were drummed, or stockpiled, and temporarily stored on site Each drum was labeled with the soil borehole number and depth from which the soils were extracted DECONTAMINATION AND QUALITY ASSURANCE PROCEDURES 1 Proper decontamination and cleansing of all equipment was performed to prevent cross- contamination between wells and sampling locations The two methods of decontamination used at the site were steam cleaning and detergent washing followed by tap water and distilled ' water rinses During field work, all equipment that was placed in the borehole or wells, or that came in contact with groundwater was decontaminated as follows Equipment Decontamination Procedure Drill Rig Steam cleaned prior to amving on site ' Augers Steam cleaned prior to drilling each borehole ' Drill Tools Steam cleaned prior to drilling each borehole Split-Spoon Sampler Steam cleaned between each borehole, then ' Alconox washed, and tap water and distilled water rinsed between each sampling interval ' PVC Casing Steam cleaned before installation in well Well Development Equipment Alconox washed and steam cleaned between each use ' Water Level Sensor Alconox washed, tap water and distilled water rinsed between each use 04/18/94/1213821125997/DRILDONE DOC