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Union Ice Company 1320 West Weber Street, Stockton, California Phase IInvestigation Report Brine Release 1.0 Site History The Union Ice Company has been operating at this site for decades. The operations include ice making as well as cold storage for various clients. A Brine solution is piped through the slab floor of the plant to avoid freezing. Union Ice company recently became aware that there may have been releases from the pipes that run through the slab floor. Until five years ago the solution contained chromic acid (Cr6) as a corrosion inhibitor. The brine solution containing chrome was removed approximately five years ago. The solution was treated on-site with a mobile TTU and the filter cake disposed of at a Class I landfill. The work was performed under permit from the California Department of Health Services. The current brine solution contains a non-tonic rust inhibitor. Union Ire Company notified the California Regional Water Quality Control Board (RWQCB) and the Local Health Department of a suspected release by telephone to Mr. Gordon Boggs of the RWQCB. and followed up in a letter to the RWQCB. The RWQCB requested an investigation and requested that a report of the findings be forwarded to Ms. Wendy Cohen of the RWQCB. Ms. Cohen also sent a letter to WHF stating the R1-1QCB would not provide project supervision at this time and that the investigation should proceed on a self-directed basis. On January 26,1993 WHF submitted a work plan to the San Joaquin County Environmental Health Department to install three groundwater monitoring wells at the site. WHF also submitted a well permit with the appropriate fees for the proposed work. 2.0 Scope of Work WHF proposed to install three groundwater monitoring wells down-gradient from the warehouse. Three wells should be sufficient to detect any release originating at the warehouse. The groundwater hydraulic gradient at the site is known, and has been consistent over the last few years, as monitored during an ongoing hydrocarbon investigation at the site. A, recent groundwater gradient map is included in the figures section of this report.