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i City of Stockton TL 394-0074-01 May 4, 1994 Page 14 recorded as >300 ppm). The exception to this is when the discoloration reads less than the lowest value, this would be recorded as "less than (<)" the lowest value on the tube. After use tubes will be disposed of as hazardous material because the contents are corrosive and the broken glass tip is a cut hazard. A-9 Standard Operating Procedures for Performing Head Space Analysis: Head space analysis will be performed 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 for 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-10 Decontamination Rinsate,Monitoring Well Purge Wates 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 be steam-cleaned on racks, and the rinsate will be retained in a steel trough, and then transferred to drums. Water purged from monitoring wells will be containerized in drums if contamination 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. Each drum will be labelled to identify its contents. Disposal of these wastes will be the responsibility of the client. The client will be informed that the wastes must be disposed in accordance with applicable Federal, State, and local regulations.