STATE OF MAINE Department of Environmental Protection (MEDEP) Bureau of Remediation and Waste NIanaQement 1VEEMORA1vDUiVI TO: Carla Hopkins, Project Manager, Division of Solid Waste FROM: Richard Heath, Senior Geologist, Division of Technical Services DATE: Tune 14, 2004 Review of Water Quality Results Dragon Products Company Thomaston, ME Cement Manufacturing Facility General Comments Water Quality Data In reviewing water quality results for the Dragon Products, Inc. facility I graphically represented data of major ions and indicator parameters on time-series plots for: • Groundwater monitoring locations associated with the CKD pile (attached Figure 1); Groundwater monitoring locations associated with the Clinker pile (attached Fijure 2); • Leachate for both the CKD (DQl) and Clinker piles (CD I) (attached Figure 3); and • Surface water monitoring locations (attached Figure 4) I visually inspected these time-series and performed statistical trend analysis using the Mann-Kendall test. A tabular summary of water quality at these locations is provided in Table 1. Results of upward and downward trend analyses are included in Tables 2A and 2B, respectively. A summary of exceedances of MCL and MEGs is provided in Table 3. The leachate sampling locations (DQ1 and CD1) continue to show erroneously low specific conductance (SpC) readings. The most likely reason for this discrepancy is the improper reading of the gain function on the field conductivity meter. Field personnel should be instructed in the proper reading of the instrument. The following paragraphs provide a general assessment of water quality. Figure 1 - CKD Pile Groundwater Monitoring Results The most apparent impact to groundwater quality associated wifh the CKD pile has occurred at monitoring well B2; which is screened in bedrock approximately 46 to 50 feet

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