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' SOUL INVESTIGATION KOPPEL STOCKTON TERNUNAL STOCKTON, CALIFORNIA 1.0 INTRODUCTION On 6 July 1995, the Regional Water Quality Control Board (the Board) accompanied Roy F. Weston, Inc. (WESTON(&) to the Koppel Terminal, Port of Stockton, California to evaluate the potential presence of nitrate and ammonia in subsurface soil at the terminal. WESTON collected ' split samples on behalf of Munco, Inc. Personnel on-site included Wendy Wyels (the Board), and David Marks (WESTON). Work was performed in accordance with the WESTON Work Plan dated 17 April 1995, which had been approved by the Board. ' Previous work at the site was performed on 6 March 1995 when WESTON staff collected split samples during the Board's initial sampling event at the Koppel Stockton Terminal. One water ' and eight soil samples were collected from between 0 and 8 inches depth. The 6 March samples were analyzed for nitrate as nitrogen (N) and ammonia as N, however, they were not extracted by the Toxicity Concentration Leaching Procedure (TCLP) as were the 6 July samples. ' Analytical results indicated total nitrogen concentrations in excess of 250 mg/kg in five of the eight soil samples. However, results were vastly different between split samples analyzed by ' the Board and by WESTON. The soil samples in excess of 250 mg/kg were collected from surface crusts and surface soils along the west side of the main terminal building. No subsurface (deeper than 8 inches) samples were collected from the site during the March sampling. The objective of the work completed during the 6 July sampling event was to evaluate the vertical extent of the surface concentrations of total leachable nitrogen at three of the five ' locations sampled in March. Groundwater in the vicinity of the site has been estimated at 10 to 12 feet below ground surface (bgs). ' 2.0 FIELD ACTIVITIES Prior to starting work, WESTON acquired the necessary boring permit required by the San Joaquin County Environmental Health Division. A breaker bar was used along with a hand auger to penetrate the hard-packed surface soil that was previously encountered during the 6 March sampling at the site. 1 The field activities consisted of hand augering three borings to 6 feet below grade. Soil samples were collected from depths of 3 and 6 feet below grade from each boring, composited, and split ' with the Board. The Board also collected a 0 to 6 inch sample from each boring. The boring locations are shown on Figure 1. Boring SBI was located at the 6 March sample location for "KOP-IM and KOP-3M." SB2 was located at the "KOP-4M" sample location and SB3 was located at the "KOP-5M" sample area. Samples were collected by initially hand augering to the appropriate sampling depth using a 3.5- inch diameter hand auger. The hand auger was then decontaminated using an Alconox detergent ' LWROIEMIVL :MZLSSMR I 0&1895