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GEC STANDARD OPERATING PROCEDURES FOR HYDROPUNCHTM GROUNDWATER SAMPLING All environmental groundwater sampling will be done under a site-specific Health and Safety Plan for the protection of GEC's employees. The designated Health Safety Officer (HSO) shall be notified of any unusual conditions encountered at the site. HydropunchTM samples will be obtained from boreholes through the drilling equipment. See the GEC SOP for the drilling method used. All permits should be obtained prior to drilling, especially the appropriate well permit. This SOP covers GEC's typical procedures used during HydropunchTM groundwater sampling for environmental purposes. These procedures, in addition to any modifications noted in the site- specific workplan, will be followed by GEC field personnel. All field personnel are required to review these procedures, the site-specific workplan or proposal, and the Health and Safety Plan prior to mobilization to the site. • Prior to mobilization to the site, the field a/g/s will check all necessary field equipment and tools. All equipment will be charged, calibrated, and checked for proper operation prior to the field work. All sampling equipment will be decontaminated prior to leaving the office/shop. See the field equipment and sampling supplies checklist for a list of typical items for this type of work. The drilling subcontractor should also decontaminate the HydropunchTM tools prior to mobilization to the site. • Prior to the start of drilling activities, and between boreholes, down-hole drilling equipment will be steam-cleaned in a pre-designated area to minimise the potential for cross- contamination. Decontamination fluids will be containerized on the site in 55-gallon drums or a storage tank pending characterization and disposal. • HydropunchTM sampling is typically performed through hollow stem augers or drill casing used to drill the borehole. The boring will be advanced to a point immediately above the suspected groundwater surface. • Prior to each drive sampling attempt, the HydropunchTM sampling device will be decontaminated by washing in a solution of AlconoxTM and tap water, rinsing with tap water, rinsing with a dilute (1%) solution of nitric acid, rinsing with deionized water, rinsing with hexane, double rinsing with deionized water, and allowing to air dry. Excess hexane will be allowed to evaporate. • The decontaminated HydropunchTM sampling device will be attached to the drill rods by GEC's on-site field a/g/s. The sampling device will be 4.75 feet long and will have a 4-foot long screened interval. • Once fitted to the drill rods, the sampling device will be lowered into theoftcenter of the auger until the bottom of the borehole is encountered. The advanced 4.5 feet (or until refusal) into the undisturbed subsurface soils hcally or us the sampling hammer. APR 16 1998 ® GEC Standard Operating Procedure ENVIRONMENTAL HEALTH Last Revision December 1997 PERMIUSERVICE1