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AwNGER$ ESGNEFS+CONSLtINAS sleeves. All samples will be screened in the field using a photoaonazataon detector (PID). If ' floating product is present within the hollow stem auger, an attempt will be made to remove the product by bailing or absorbing it prior to sampling One soil sample collected below the water table and two soil samples collected above the water table will be submitted for laboratory ianalysis Samples submitted for analysis will be chosen based on PID, visual, and olfactory observations. ' The brass liners containing samples for chemical analysis will be capped with Teflon''" sheeting L and plastic caps The samples will be placed in plastic bags and stored on ice at a temperature of approximately 4°C for transport to an analytical laboratory A thermometer will be kept in the cooler to confirm the temperature of the samples The remaining soil will be described ' following the Unified Soil Classification System (USCS) under the direction of a California Registered Geologist ' A grab groundwater sample will be collected with a Hydropunch''' or equivalent system at ' approximately 55 ft bgs A clean stainless steel bailer will be used to collect the samples. The grab groundwater water sample will be placed in the appropriate sample container (see Section 3 3 1). Care will be taken to prevent air bubbles from forming an the 40 ml sample containers for volatile analysis The sample will be sealed an a plastic bag and stored on ice at temperature of approximately 4°C for transport to the analytical laboratory After the soil boring is completed the borehole will be backfilled with pea gravel or sand from 45 ft to 60 ft bgs to prevent grout from intruding the aquifer and disrupting monitor well MW- 2A If pea gravel as used, approximately 3 feet of sand will be placed on top of the pea gravel to minimize the potential for bentonite to enter the gravel Approximately 5 feet of bentonite pellets or chips will be placed on top of the sand After the bentonite has hydrated, the borehole will be backfilled to the surface with a bentonite/cement grout The concrete sidewalk will be patched with concrete 2.4 QUARTERLY GROUNDWATER MONITORINQ SAMPLING PROCEDURES Groundwater monitor wells will be sampled quarterly according to the schedule contained in Section 1 2. Prior to each sampling event a complete round of water levels will be collected. Each well to be sampled will be purged of three to five casing volumes with either a Teflon' Ibailer or a submersible pump During purging, the pH, temperature, and electrical conductivity of the groundwater will be measured Groundwater samples will be collected using a clean nylon line and Teflon' bailer The groundwater water sample will be placed in the appropriate LIPROJECCszANJoQWSAWP 6