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11/10/98 TUE 09:56 FAX 916 364 1389 SECOR-SACRAMENTO fd009 2. Selected soil samples collected at various depths will be retained in the sample liners (the sample liner containing the desired sample will be cut into a 12 -inch or shorter length with a clean knife blade or clean hacksaw blade_), and the ends eovtred with TeflondD sheers and plastic end caps. 3.2 Borehole Abandonment Procedures After the soil samples have been collected from each soil boring, the boreholes will be grouted to the surface using neat cement. The cement will be pumped or tremied into the borehole. Co GROUNDWATER SAMPLING 4,1 Groundwater Grab Sampling Procedures Groundwater grab samples will be collected from boreholes by lowering I -inch diameter PVC screen and casing to the total depth of the borehole. The proper lengths of screen and blank casing will be cleaned and threaded above the ground prior to lowering inside the borehole- The well screen will be 5 to 10 It in length and will extend across the water table surface. The bottom of the screened interval will be fitted with an end plug. Samples of the groundwater will be collected from each temporary well using a Teflon* bailer or a pump wbich has be washed in a solution of Atconox or non -phosphate TSP followed by several rinses with potable water, or by using a disposable bailer which was removed from its factory protective cover immediately prior to sampling the well. The groundwater samples collected from each well will be decanted into the appropriate sample containers for each analyte. Care will be taken when transferring the water from a bailer to the sample containers to avoid turbulence and all VOA vials will be filled above the top of the opening to form a positive meniscus so that no headspace will be. present. 4.2 Monitoring Well Sampling Procedures Each groundwater monitoring well will be purged using a low flow peristaltic pump prior to collecting groundwater samples for chemical analyses- During the purging process, approximately three well volumes of groundwater will be discharged from the well using either a pump or bailer. The well will be properly purged when the physical parameters of the groundwater (Le, pH, temperature, and conductivity) have stabilised If the well is evacuated prior to the removal of three to fine well volumes, a sample of the groundwater will be collected when the water level is sufficient to provide a representative sample (i.e., retum to 80% or more of the static water level). Samples of the groundwater will be collected from each monitoring wel I [sing the peristaltic pump for inorganic and non-volatile organic canstiments and a bailer for the volatile organic constituents. The bailer used for sampling may be a Teflon' or stainless steel bailer which has been washed in a solution of Alconox followed by several rinses with potable or deioniz d water, or a disposable bailer which was removed from its factory protective cover immediately prior to sampling the well_ The groundwater samples collected from each well will be decanted into the appropriate sample containers