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03.3011995 14= 32 FROM MUNCO�. TO 1916444 - -- -� F. 05 ATTACHMENT A PRELIMINARY FIELD INVESTIGATION KOPPEL TERMINAL PORT OF STOCKTON A'1 STOCKTON9 CALIFORNIA y � rtil,, , �g95 i•0 IIVTTtODUCTION On March 6, 1995, Roy F. Weston, Inc. (WESTONQ accompanied the Regional Water Quality Control Board (RWQCB) to the Koppel Terminal, Port of Stockton, California to evaluate the potential presence of nitrate in soil at the terminal_ WESTON collected split samples on behalf of Munco, Inc. Personnel onsite included Wendy Wyels (RWQCB), Gail Wiggea (RWQCB), and David Marks (WESTON). The goal of this project is to develop independent data to evaluate the quality and representative- ncss of the data developed by the Regional Board's sampling effort. WESTON split all primary samples and used the same sample ID as the RWQCB except added "-M" to denote a Munco split sample. All samples were analyzed for the same analytical suite using the same EPA methods as specified by the RWQCB for their samples. 2.0 FIELD ACTS Eight soil samples were collected from seven locations using a hand auger and stainless steel trowel (Figure. — I ). Sampling equipment was decontaminated prior to each use using a TSP/water wash and a deionized (DI) water spray rinse. The equipment was not brushed during the decontamination procedure. No equipment decontamination blanks were collected. Four of the eight samples were composited by placing approximately equal volumesof soil in small brown paper bags and shaking the bag prior to placing it in a sample jar. WES0 noted that so RWQCB personnel gcaerdly did not use surgical latex gloves while collecting approximately half of the samples. One water sample was collected using a Teflon dipper to transfer surface water from a puddle into laboratory supplied bottles with preservative soil at the site was saturated and several Puddles of standing water were visible. Many of the puddles, particularly along the not rtheaser a Pune green color. Many of corner of the terminal, contained enough algae to tint the wat the soil samples (including KOP-4M and KOP-S ) were taken from saturated holes which eventually contained standing water. This would indicate that the analytical results for these samples are not likely to be representative of true concentration in soil. The following discussions briefly describe the collection of each sample. KOP-1M was compusited from 4-6 inches below grade surface (bgs) using a hand auger and trowel. The soil sample was saturated and there were puddles of standing water on both sides of the sample location, The sample was ta)er) from beneath a former loading hopper for rail cars attached to the building. M1`C'A �:'Yili,tiGTS7.1i1N(Yly(niRF1.1�✓ 1