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3 METHODS <br /> Soil and water samples were collected by PG&E's Technical and Ecological Services Department, <br /> Environmental Chemistry Unit personnel. A field logbook was maintained by sampling personnel in <br /> order to document the sampling scheme and the number and identification of samples collected, <br /> analyzed, and retained. Chain-of-custody procedures were applied to all samples shipped to the testing <br /> laboratory. All samples were placed in cooler(chilled to 4°C), and transported to a certified laboratory <br /> for analyses. <br /> All containers used were pre-cleaned to EPA standards. Sample identification varied for each sampling <br /> period. Each sample container was labeled with the date,time, sampler's initials, and sample <br /> identification. Sampling of the soil and water followed, where applicable, those guidelines addressed in <br /> Section 1060 of Standard Methods for the Examination of Water and Waste Water, 17th Edition, 1989, <br /> Chapter 9 of Test Methods for Evaluating Solid Wastes,EPA SW-846, 3rd Edition, 1989,and Section <br /> 66261,Title 22, California Code of Regulations. <br /> The two State certified laboratories used to analyze the samples were Chromalab, Inc. and Clayton <br /> Environmental Consultants of Pleasanton, CA. <br /> 4 FIELD SCREENING <br /> Initial sample locations for April 22 and 25, 1997 were screened for Total Petroleum Hydrocarbons <br /> (TPH)as motor oil using the Hanby Environmental Screening method SW846,Method 4030. This <br /> method utilizes a colorimetric indicator to signify the level of hydrocarbons present in the soil. Based on <br /> field screening, samples were collected at the locations in the leak area. <br /> 5 SAMPLING AND ANALYTICAL RESULTS DISCUSSION <br /> Sampling at twelve locations on April 14, 1997, show results for hydrocarbons as Diesel ranging from 77 <br /> mg/kg to 7700 mg/kg and hydrocarbons as motor oil ranging from 670 to 57,000 mg/kg. The area was <br /> excavated to a depth of 6 to 18 inches(Figure 1)and additional samples were collected on April 22, 1997 <br /> and tested for diesel,motor oil, and hydraulic oil. Results indicated that diesel and motor oil was not <br /> detected,but hydraulic oil was detected ranging from 110 mg/kg to 35,000 mg/kg. Results of soil <br /> • samples collected on April 14, 1997 and April 22, 1997 are listed in Table 1. <br /> 562 1-98 100.doc 3 <br />