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. I~ð c. Specific Conductance will be measured during sampling. d. The Texas Natural Resource Conservation Commission will analyze split samples in June 1994 for PCBs and if detected, again in December 1994. If PCBs are detected in June 1994 and confirmed in December 1994, subsequent quarterly sampies will be analyzed for PCBs by the City of San Marcos. 9. Perform sampling according to the following schedule: i a. June and December 1994. b. March, June, September, and December 1995. 10. The estimated cost of sampling is $21,000, which includes the private well. The cost of sampling wells is estimated to be $3,500 per sampling event. The costs of four sampling events will be equally divided among the Potentially Responsible Parties. The Corps of Engineers will pay the cost of two of the 1995 sampling events (estimated at $7,000). The estimated cost for the carbon whole-house filters is $1,000 per unit with a total cost of $7,000. The cost will be equally divided among the Potentially Responsible Parties. Th@ City of San Marcos will pay the estimated cost of $60,000 for regrading the surface of the landfill site. The City of San Marcos will remove the monitoring wells. The Corps of Engineers will reimburse the City of San Marcos for actual cost up to $7,500. The Corps of Engineers will install up to three wells at an estimated cost of $2,500 per well. The City of San Marcos and the Department of Labor's other obligations are reflected in the agreed resolutions. , 11. Upon completion of sampling, but not later than April 30, 1996, Texas Natural Resource Conservation Commission will meet with the other parties and make a determination whether Phase I was effective in solving migration of contamination, and if further action is necessary. The determination will be based on 1993 MCLs and will consider trends in values of chemical constituents and their relationships to risk to human health. 12. If Phase I is effective, then monitoring will be terminated and monitoring wells will be removed by the City of San Marcos. 3