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16 <br /> 1 INTRODUCTION <br /> The purpose of this report is to document soil sampling results for petroleum hydrocarbons in soil <br /> associated with a leak of hydraulic oil at Well 18-west located at PG&E's McDonald Island Gas Storage <br /> Facility between the period of April 14, 1997 to August 18, 1998. <br /> The affected area was impacted by approximately 100 gallons of hydraulic fluid. The hydraulic fluid <br /> was released as a result of a leaking fuse plug on a hydraulic line which services the fire suppression <br /> system at the wellhead. The source was isolated and hydraulic fluid observed on the surrounding soil <br /> surface was contained with absorbent material. Following isolation of the leak and surface cleanup, <br /> approximately fifteen yards of impacted soil was removed and placed on visqueen. The excavated soil <br /> was placed in bins, and manifested accordingly from the analytical results of the surface samples. <br /> Following the initial cleanup,additional samples were taken over a period of several months to meet the <br /> cleanup levels. The affected area was approximately 7 feet in circumference by 17 feet deep. This <br /> report presents a description of the field methods used for sampling the soil and water along with results <br /> of the tests. <br /> 2 SAMPLE EVENTS <br /> Analytical results and sample locations are presented in Tables 1-5 and Figures 1-3 in chronological <br /> _ order. <br /> April 14, 1997 <br /> Soil was sampled following a leak of hydraulic oil at Well 18-west and analyzed for Total Extractable <br /> Petroleum Hydrocarbons(TEPH)for Diesel and Motor Oil by EPA Method 8015 modified. <br /> April 22, 1997 <br /> Soil was sampled at 6 to 18 inches below the ground surface and analyzed for TEPH as Diesel,Motor <br /> Oil,and Hydraulic Oil. <br /> April 25, 1997 <br /> Soil was sampled at 12 to 42 inches below the ground surface and analyzed for hydraulic oil by EPA <br /> Method 8015M. <br /> • <br /> 562 1-98 100.doc 1 <br />