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Soil Sampling Work Plan <br /> Cargill,Port Road No.8, <br /> Stockton,California <br /> Sierra-Pacific Project No.95-128.01 <br /> 2.0 PURPOSE OF SOIL INVESTIGATION <br /> The objective of this investigation is to map the lateral and vertical distribution of nitrogen <br /> compounds at the facility. To achieve this objective, Sierra-Pacific will conduct a soil <br /> investigation to determine if soluble nitrogen compounds, especially ammonium and nitrate, <br /> --a have migrated from the surface to the saturated zone. Nitrate attenuation with depth, and the <br /> nature of any potential ground-water quality problems at the Cargill site will be largely <br /> understood after sampling and testing soils to a depth of twelve (12) feet bgs. <br /> `J 3.0 SCOPE OF PROPOSED WORK <br /> Six soil borings will be advanced at the Cargill site to depths of 12-feet bgs. Field work will be <br /> staged so that nitrate field tests can be used to direct the sampling program and avoid the <br /> necessity of returning to the site for additional data. Sierra-Pacific will use Bobcat-mounted <br /> auger and hand-augers to collect soil samples. Twelve soil samples will be sent to a California- <br /> certified laboratory for nitrate and Total Kjeldahl Nitrogen (TKN) analysis. <br /> 3.1 Task 1 - Field Preparation Activities <br /> A Bobcat tractor, auger, and extensions will be rented from a local agency. It may be necessary <br /> to rent a concrete hole saw. A soil boring permit will be obtained from San Joaquin County <br /> prior to sampling. Utility Services Alert (USA) will be contacted prior to initiating work, and <br /> a private utility finder will be hired to examine proposed sample locations for buried structures <br /> and pipes. Sierra-Pacific will request Cargill management's assistance in identifying <br /> underground utilities and piping. <br /> ..J <br /> 3.2 Task 2 - Bobcat Drilling, Hand Augering, and Sample Collection <br /> Soil borings will be advanced at locations shown on Figure 3, and soil samples will be recovered <br /> from various depth intervals depending on the results of nitrate field testing. Below is a <br /> Sierra-Pacific Groundwater Consultants, Inc. 2 <br />