SITE INFORMATION AND CORRESPONDENCE_CASE 2

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CEMEX Tracy Facility Page 2 of 3 30350 South Tracy Blvd. April 2, 2014 Tracy, California 95376 To move this site to closure, the EHD directs that a conceptual site model be prepared that adequately addresses the assessment, remediation and, ultimately, final closure requirements for this site. Please include the following to facilitate closure consideration: • Sensitive receptor survey that includes surface water bodies, schools, hospitals, daycares, etc., as well as domestic, municipal, industrial and other wells within a 2,000- foot radius of this site. Contact the Department of Water Resources, municipal water suppliers, and nearby industries for well information and submit any known construction details of the wells. Perform a physical search of the area, including this site, to identify all wells, including on-site domestic and monitoring wells MW-1, MW-2, MW-3, and show the location of all on- and off-site wells on a map, relative to the site map; • Cross sections, or references to reports with cross sections, that show correlated soil lithologies, contaminant concentrations (including soil analytical results from soil borings DP-3 through DP-7 and C13-1 through CB-7-SO), lateral and vertical extents of impacted soil and groundwater, and contaminant migration pathways; • Cross sections of the recent over-excavation of Area 2 showing the lateral and vertical extent of the over-excavation, the technical justification for removing the soil, and submittal of the manifests associated with the soil removal; • Tables of current and historical soil and groundwater data, including naphthalene results for soil samples DP-3 through DP-7, CB-1 through C13-4, CB-5-SO through CB-7-SO, and groundwater samples collected on 28 February and 24 September 2013; • Calculations showing estimates of the residual adsorbed total TPH-d contaminant masses; • Fate and transport model that includes an estimate of the future impact to groundwater from adsorbed contaminants; and • Technical reason for the single detection of TPH-d in groundwater in February 2013. In the November 2013 groundwater monitoring report, SOMA reported that monitoring well MW-4 had been severely compromised and could not be sampled. The EHD directs that MW-4 be destroyed immediately. Submit a work plan to the EHD by 8 May 2014 to destroy MW-4 and upon approval of the work plan, submit a well destruction permit application, Master File Record form, permit/inspection fees and complete the destruction of MW-4 by 29 May 2014. During the process of submitting the requested information listed in the bullets above, if it can be demonstrated that this site meets the Low-threat Closure Policy criteria, submit a closure srummary rennrt to the EHD.