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WORK PLAN <br /> SOIL INVESTIGATION <br /> KOPPEL STOCKTON TERMINAL <br /> STOCKTON, CALIFORNIA <br /> 1.0 INTRODUCTION <br /> This work plan has been prepared by WESTON on behalf of Munco, Inc. The work is proposed <br /> to evaluate the presence of a potential nitrogen source area at the Koppel Stockton Terminal <br /> Facility, 2025 West Hazelton Avenue, Stockton, California. <br /> Previously, WESTON staff collected split samples during the Regional Water Quality Control <br /> Board (the Board) sampling event at the Koppel Stockton Terminal on March 6, 1995. One <br /> water and eight soil samples were collected from between 0 and 8 inches depth. Analytical <br /> results indicated total nitrogen concentrations in excess of 250 mg/kg in five of the eight soil <br /> samples, however, results were vastly different between split samples analyzed by the Board and <br /> by WESTON. Five soil samples were collected from surface crusts and surface soils along the <br /> west side of the main terminal building. No subsurface (deeper than 8 inches) samples were <br /> collected from the site. <br /> The objective of the additional work proposed in this workplan is to evaluate the vertical extent <br /> of the surface concentrations of total nitrogen at three of the five locations. <br /> 2.0 PROPOSED FIELD ACTIVITIES <br /> The proposed field activities will consist of hand angering three borings to 6 feet below grade. <br /> Soil samples will be collected from minimum depths of 3 and 6 feet below grade from each <br /> boring. The boring locations are shown on Figure 1. A breaker bar will be used along with <br /> a hand auger to penetrate the hard-packed surface soil that was encountered during the March 6 <br /> sampling at the site. Prior to field mobilization, WESTON will acquire the necessary boring <br /> permit required by the San Joaquin County Environmental Health Division. <br /> Samples will be collected by initially hand augering to the appropriate sampling depth using a <br /> 3.5-inch diameter hand auger. The hand auger will then be decontaminated using an Alconox <br /> detergent and a deionized water rinse, replaced in the hole, and the soil sample will be collected <br /> by augering. The sample will be transferred into a laboratory supplied glass container <br /> appropriate for each analysis. The sample containers will be labeled and placed in a chilled <br /> cooler with ice and transported, along with a chain-of-custody documents, to Sequoia Analytical <br /> Laboratory in Sacramento, California, a laboratory certified by the State of California to perform <br /> the required analysis. <br /> During hand augering, soil samples will be collected at 2 foot intervals for lithologic description <br /> of soil. The samples will be described using the Unified Soil Classification System (USCS) and <br /> a lithologic log of each boring will be produced. <br /> An equipment rinse sample will be collected in the field to check decontamination procedures <br /> NCA I LW%OIFCISWtM \W0W?L%lX0f 1 WTM <br />