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Mr. Jim Walsh 0• 0• ' July 15, 1988 Page 2 unable to accommodate runoff from industries in this area . This probably ' explains why pond overflow has historically discharged into the drainage ditch. ' SAMPLING AND ANALYSIS PLAN This section presents the proposed sampling and analysis objectives , sam- ' pling locations and depths, sampling procedures, analytical parameters and procedures, and report preparation. ' Sampling and Analysis Objectives The Sampling and Analysis Plan is designed to ( 1 ) determine if the storm- water collection pond and drainage ditch are contaminated, (2) determine the ' contaminant parameters , and (3) assess the vertical and lateral extent of contaminants . ' Sample Locations and Depths Figure 2 presents the proposed pond sampling locations . The sampling strategy is based on differentiating the visible discoloration around the ' perimeter of the pond, which was probably caused by floating motor oil . The oil may have been concentrated along the pond perimeter by wind action . The largest area of discoloration is at the northwest corner, near the pond ' pump. All sampling locations beginning with S1 are within this area . The remaining portions of the pond perimeter constitute the next four sampling zones (sample locations beginning with S2, S3, S4, and S5) . The pond bottom has been divided into western , middle , and eastern sample zones (sample locations beginning with S6, S7, and S8) to effectively characterize this area. The bottom could have been impacted by oil during dry seasons when the pond water evaporated, or possibly from water-soluble contaminants. 1 Pond soil samples will be collected at the surface and 2 and 3 feet below the surface. Table 1 presents a summary of the sampling plan. ' Soil samples will also be collected at 10 locations along the drainage ditch , at the surface and 2 feet below the surface . The soil will be ' sampled at the point of discharge from the pond , at the end of the dis- coloration at the edge of the driveway, and at four additional equally spaced locations at intervals of approximately 36 feet (see Drawing 1) . Soil samples will also be collected at the beginning and end of the ditch between ' the driveway and Navy Drive, and at two equally spaced locations between these points . Sampling Procedures Soil samples will be collected with either a hand auger or a core sampler in t accordance with the procedures listed in 9 . 2. 2 .4 of Evaluating Solid Waste: Physical/Chemical Methods , U.S. EPA SW-846, November