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CSE GENESIS ENGINEERING & REDEVELOPMENT 2. Equipment shall be thoroughly rinsed with potable water. This decontamination procedure shall be performed before equipment is used and between each boring location. 3. Drilling shall be performed from the "least"to"most" contaminated area. when practical. 2.4.2 Sampling Equipment Decontamination The following procedures will be used to decontaminate soil sampling equipment(i.e., split- barrel samplers): 1. New disposable gloves will be used for each decontamination procedure to prevent cross-contamination of equipment. 2. Equipment will be scrubbed with brushes using a solution of AlconoxTM and potable water. Equipment will be triple rinsed with potable water. 3. If the sampling device is not going to be used immediately, it will be wrapped in oil free aluminum foil with the shiny side out. Sampling equipment used to collect samples for organic analyses will not be allowed to come into direct contact with plastic. 4. Sampling equipment that is not readily decontaminated will be discarded after each use. Discarded decontamination solutions, will be accumulated and containerized in U.S. DOT IA2-rated drums, or equivalent, for further characterization and disposal. 2.4.3 Field Instrument Decontamination The following procedure will be used to decontaminate groundwater sampling equipment: 1. Equipment, or portions of equipment,which are water resistant will be scrubbed with a solution of AlconoxTM and distilled water. Equipment will be rinsed with potable water followed by a rinse with distilled water. 2. Equipment, or portions of equipment, which are not water resistant will be repeatedly wiped with a paper towel moistened with a solution of AlconoxTM and distilled water until clean. Ripon Farm Services,Inc. 7 of 1$ Sampling and Analysis Plan July 2009