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December 15, 1993 LF-2963 <br /> REPORT ON <br /> GROUND-WATER SAMPLING AND <br /> ANALYSIS AT THE UNION ICE COMPANY FACILITY <br /> WEST WEBER AVENUE, STOCKTON, CALIFORNIA <br /> INTRODUCTION <br /> This report describes Levine•Fricke's recent ground-water sampling and analysis to <br /> further characterize a suspected brine release at the Union Ice Company Facility, 1320 <br /> West Weber Avenue, Stockton, California (the Site, Figure 1). <br /> Background <br /> Union Ice Company has been making ice and providing cold storage services at the Site <br /> for decades. To prevent freeze damage, a brine solution is piped through the slab floor <br /> of the plant (westernmost building on Figure 2). The brine solution that was used prior <br /> to 1988 contained chromic acid as a corrosion inhibitor, and Union Ice Company has <br /> reason to suspect that a brine release may have occurred during the time when this old <br /> brine solution was used. (The current brine solution used by Union Ice Company <br /> contains a non-toxic corrosion inhibitor.) <br /> Union Ice Company notified the RWQCB of the suspected release, and the RWQCB <br /> requested that a self-directed investigation be conducted at the Site, with reports of the <br /> findings submitted to Ms. Wendy Cohen of the Central Valley Regional Water Quality <br /> Control Board (RWQCB). <br /> In response to the RWQCB request, WHF Environmental Consultants (WHF) conducted <br /> a Phase I investigation during February and March of 1993, and submitted their Phase I <br /> investigation report to Ms. Wendy Cohen of the RWQCB. Three ground-water <br /> monitoring wells were installed downgradient of the suspected release area, and ground- <br /> water samples collected from those wells were analyzed for total chromium content. The <br /> chromium concentrations in those samples ranged from 0.278 to 0.335 mg/L. Although <br /> these reported concentrations exceed the current state and federal drinking water <br /> standards (state MCL = 0.050 mg/L; federal MCL = 0.10 mg/L), the ground-water <br /> samples collected during WHF's investigation were not field filtered, in accordance with <br /> accepted practice for dissolved total chrome analyses. As a result, the analytical results <br /> 1 <br />