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14 July 1991 Page 1 of 6 Groundwater Monitoring Report - (Second Ouarter 1991) i " " t Stockton Soil Treatment Facility ` u M1 •. -� J U L 2 3 '"^1 Introduction ENVIRONMENTAL HEALTH PERMIT/SERVICES This quarterly report summarizes the results of groundwater sampling and analysis conducted at the Stockton Soil Treatment Facility (Figure 1). A groundwater monitoring program was implemented to meet the requirements set forth in the California Administrative Code (C.A.C.) Title 23, Subchapter 15, relative to water quality monitoring for classified waste management units. In accordance with the groundwater monitoring plan, which as submitted with the Report of Waste Discharge dated May 1990, supplemental information submitted in July 1990, and C.A.C. title 23, Chapter 15 requirements, this report presents the results of the groundwater sampling for the second quarter of 1991. Background The existing contaminated soil stockpile at the site was constructed in October 1988 as part of the former Tillie Lewis Foods Cannery Site Remediation. The stockpile was previously used for storage of soil contaminated with N6 fuel oil from the former Tillie Lewis site remediation project. Three groundwater monitoring wells have been installed at the facility (see Figure 2), and the results of previous samplings have been reported. No petroleum hydrocarbons were detected in any soil or groundwater samples collected during installation of the wells or during previous sampling. SamplinL, and Analvsis Sampling of the three groundwater monitoring wells was performed on 17 April 1991. Prior to sampling, water levels were recorded, and no floating product or odors were observed in the groundwater. Stagnant water was removed from the wells by purging a minimum of three casing volumes. To ensure collection of representative samples, field measured pH, conductivity, and temperature were allowed to stabilize prior to sample collection. Copies of the sampling records are attached to this report. Purging of the wells and collection of the samples was performed with a Teflon bailer. Before and after the sampling of each well, all of the sampling equipment was cleaned with Alconox followed by three successive rinses with organic-free deionized water. Samples of equipment rinse water (equipment rinsate blanks) were collected after decontamination of the bailer and prior to collection of each well sample. Groundwater samples were properly sealed and placed in a cooler with ice prior to transportation to Roy F. Weston, Inc. (formerly Canonie). Proper sample handling and chain-of-custody documentation were maintained during all phases of this study.