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i City of Stockton `t TL# 394-0192-01 �i September 16, 1994 h Page 14 f { Prior to use the tubes will be examined to insure the shelf life' expiration date has not expired and the tube has not been opened or damaged. Tubes will only be use for o ne° test. The Drager® Gas Detector Pump will be used with Drager tubes; to insure accuracy. { Prior to use the pump will be examined to insure it is in proper operating condition. ' The tube will be opened and inserted into the pump just prior to use. The pump will be stroked the number hof times required by the specific tube in use (i.e. 2 strokes for the petrol-hydrocarbon tube) . After each stroke the pump will be allowed to open to the ' full extent of the arrestor chain (10 to 20 seconds) . If the analyte is present in the sample, llthe �material within the tube will discolor. The extent of the discolored material corresponds to the concentration of the analyte present. Readings from the tube will be recorded based upon 'the 'amount of discolored material read from the calibrated markings on the tube. In the event the discoloration should extend beyond one marking but not to the next, this will be recorded as "greater ;than (>) " the lower value. (i.e. if the discoloration extends beyond 300 ppm but does not reach 500 ppm, this would be recorded kas >300 ppm) . The exception to this is when the discoloration ;reads less than the lowest value, this would be recorded as "Bess ;than (<) " the lowest value on the tube. I After use tubes will be disposed of as hazardous material because the contents are corrosive and the broken glass tip is a cut hazard. ' D for Pell A-9 Standard,. Operating ern• •,'•..•,Q_Procedures_.....--••---.._..- rforming Head_Space Analysis: Head space analysis will be perforined using a photoionization detector (PID) or a drager tube. The soil sample will be placed in a sealed glass container or plastic bag, agitated, and placed in a warm atmosphere!, After approximately 15 minutes, which is generally sufficient foi� some of the volatiles to escape from the soil, the PID probe or tip of the drager tube will be inserted into the container and the gas will be sampled. The highest concentration of organic vapors recorded by the PID or the drager tube reading will be recorded on the boring log. A-30 Decontamination Rinsate, Monitoring Aell.� Purge Water, and soil Cuttings Disposal: The soil'( cuttings generated by drilling operations will be retained on site, and either covered by plastic sheeting or containerized in Department of Transportation- approved drums. The drilling equipment will ;ibe steam-cleaned on ` racks, and the rinsate will be retained inli a steel trough, and then '4 transferred to drums. Water purged from monitoring wells will be containerized in drums if contamination I is •known or suspected. Drums containing soil, rinsate, and purged water will be sealed and temporarily stored on site at a location remote to the public. i ij ! � it