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containers with specific preservative and post collection preservation methods should be used as described in Table I of the Groundwater Monitoring Plan. The filled sample containers should be immediately placed in a chilled cooler awaiting delivery to the analytical laboratory. All samples should be handled according to Chain of Custody SOP. All samples will be delivered to the laboratory as soon as possible. If possible, samples will be shipped on the same day as they.are collected. If samples must be retained due.to weekend sampling(Friday through Sunday), the lab shall be notified as to the time sensitive nature of the samples. Filtering of samples for dissolved metals analysis will be conducted in the field using a disposable 0.45 micron (µm)in-line filters. Field filtering will be conducted by either: Sampling by pump: • Screwing the disposable 0.45 pm filter into the discharge sampling line and sampling directly for the filter after two filter volumes have been run through it. Sampling by bailer: • Using a Teflon7m connector to attach the in-line filter to the bottom-emptying device of the bailer,allow gravity to feed the water through the filter. Sampling will begin after two filter volumes have passed through the filter. r PRECAUTIONS • Refer to the HSP for appropriate PPE. • Sampling wells in order of increasing chemical concentrations (known or anticipated)is preferred. REFERENCES • Gass,Tylor E.;Barker,James F.;Dickhout,R.;Fyfe,J.S.; 1991,Test Results of the Grundfos Ground-water Sampling Pump,From: "Proceedings of the Fifth National Symposium on Aquifer Restoration and Ground Water Monitoring" • M°Alary,T.A. and Barker,J.F.; 1987,Volatilization Losses of Organics During Ground Water Sampling From Low Permeability Materials In "Ground Water Monitoring Review"Fall 1987. • Nielsen,David M., 1991. Practical Handbook of Groundwater Monitoring,Lewis Publishers. Chelsea,MI. gw sampling.SOP Page 4 Of 5 February 2005