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��Claytori ` Ms.Devra Lewis Page 6 RWQCB Clayton Project 70-03759.00 July 31, 2004 r released from the soil sample and collect in the headspace of the bag. Field observations .� will be entered into a field notebook or on a boring log. Clayton will evaluate field observations, OVA readings, and olfactory odors to select specific sample to be submitted for laboratory analysis. In soil borings with evidence of petroleum hydrocarbon impact,soil samples will be chosen for analyses with the goal of providing, to the extent possible,the vertical extent of petroleum impact in that boring. Clayton proposes to collect soil samples only along the alignment during this preliminary investigation, and if areas of potential petroleum hydrocarbon impact are identified,then additional sampling may be proposed in select areas. 3.4.4 Grab-Groundwater Sampling A grab-groundwater sample will be collected from each of the deeper boreholes that are advanced to below the groundwater table. 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 a peristaltic pump. If groundwater is slow to flow into a borehole, a one-inch diameter polyvinyl chloride (PVC)casing with a slotted lower section will be installed in the borehole and the borehole will be allowed to stabilize for a time to allow groundwater to flow into the casing. Prior to sampling, Clayton will measure the depth to groundwater and visually check for separate phase hydrocarbons (SPH). Following the evaluation of SPH, grab- gtoundwater samples at each well-point location will be collected. The PVC casing will not remain in the borehole overnight. It should be noted that Clayton proposes to collect grab-groundwater samples only along the alignment during this preliminary investigation, and if areas of potential petroleum hydrocarbon impact to groundwater are identified, then additional sampling may be proposed in select areas to further determine the vertical and horizontal extent of the petroleum hydrocarbons. The grab-groundwater samples will be transferred directly into appropriate sample containers provided by the analytical laboratory. The samples will be sealed, labeled and placed into a pre-chilled cooler with ice for delivery to the analytical laboratory. COC records will be completed and accompany the sample shipments to the laboratory. 3.4.5 Soil Boring Abandonment All soil borings will be sealed and abandoned in accordance with SJCEHD requirements. A representative of the SJCEHD will be present to approve all grouting operations.