2011-08-09_REVISION - M1981185 (56)

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BOP NUMBER 0.0 Page 6 of 14 Monitor Well Groundwater Sampling bailer unless a submersible pump is used to sample- the well. The first water retrieved from the bailer; if used, should be discarded before collecting samples for chemical analyses. The following sampling procedure is to be used at each well sampled using a bailer: • Following purging, measure and record depth of static water level per SOP No. * . If the Well casing does not have a reference point (usually a V- cut or indelible mark in the well casing), make one. Note that the reference point should be surveyed for correction of ground water elevations to the mean geodesic datum (MSL). • Use a decontaminated teflon or stainless steel bailer and new nylon rope or twine. • Use new gloves. • Lower the bailer to the same depth in the well each time, within the screened interval taking care t� avoid hitting the bottom of the well and stirring up particulate matter. • Retrieve the bailer and empty the water into laboratory containers. All sample containers should be filled with minimal turbulence by allowing the ground water to flow from the tubing gently down the inside of the container. Fill sample bottles completely when possible, but collect at least a sufficient volume for laboratory analysis. Sample bottles for volatile organic analysis (VOCs) will be collected first, filled with minimal agitation to the water, and filled so there is not headspace after sample is capped. o Label and place samples on ice in a cooler. • Record time of sampling and record sample identification in field logbook. • Replace and lock well cap. • Complete field documentation. The following sampling procedure is to be used at each well sampled using a submersible pump: 1. Decontaminate depth to water meter, submersible pump, and tubing according to SOP No. "". Unless using dedicated equipment decontamination is only done where necessary (e.g., depth to water meter). 2. Set the pump in the middle of the screened interval. 3. Use new gloves. 4. After purging of the well, measure and record depth of static water level per SOP No. ''X 5. Fill sample bottles from the pump discharge line completely when possible, but collect at least a sufficient volume for laboratory analysis. All sample containers should be filled with minimal turbulence by allowing the ground water to flow from the tubing gently clown the inside of the container. Sample bottles for volatile organic analysis (VOCs) will be collected first, filled with minimal agitation to the water, and filled so there is not headspace after sample is capped. 0 -G