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I i• I September 30,2005 NOA Project Number: E05120B I 4.1.2 Logging Methods A geologist or engineer will log the subsurface soil and ground water conditions encountered at each ground water boring. The soil materials encountered will be logged consistent with the Unified Soils Classification System. Representative soil samples may be collected and placed into sealed ►. containers for further analysis as necessary. 4.1.3 Depth to Ground Water Measurement Procedures The depth to first ground water will be measured and recorded when it has stabilized. Water levels will be measured using an electric-line well sounder. The well sounder will be decontaminated by washing with a solution of potable water and Liquid-Nox solution or equivalent prior to each measurement event. The depth to the ground water table will be measured with a tolerance of 0.01 feet. V 4.L4 Boring Abandonment 6. of borings will be sealed and abandoned in accordance with EHD requirements. A representative of the EHD will be present to approve all grouting activities. 4.2 Ground Water Sampling Procedures 4.2.1 QA/QCProcedures QA/QC procedures will be used to minimize the potential for contamination of ground water samples taken from the borings. The QA/QC procedures may include decontamination of drilling and sampling equipment with a solution of potable water and Liquid-Nox solution or equivalent 6.. between borings,use of one duplicate sample per day,changing latex protective gloves after each sample,and recording sample information on chain-of-custody forms. 4.2.2 Water Sample Collection Grab ground water samples will be collected from each of the boxings. If favorable aquifer conditions exist,a Hydropunch sampler may be pushed to the appropriate interval,then retracted to expose the screened section of the sampler. If water readily enters the screened section,then a sample may be collected either using a small diameter bailer or polyethylene tubing with a wattera or ` peristaltic pump. If ground water is slow to flow into a boring,a one-inch diameter PVC casing with slots at its lower section will be inserted into the boring,and groundwater will be allowed to stabilize for a time prior to sample collection. r `� 5