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Mr. Michael T. Goldstein <br /> January 6 , 1986 <br /> Page 2 <br /> Task 4 <br /> Perform another computer run of the Random-Walk program to determine <br /> if the model has accurately predicted chloroform concentrations in <br /> the downgradient wells. Following confirmation of the model , it will <br /> be used to predict the location of the 100 part per billion <br /> chloroform concentration in June 1986 , and January and June 1987 . <br /> Task 5 <br /> Evaluate the results of the above to determine if the lateral and <br /> vertical extent of the plume has been defined and if additional wells <br /> are necessary to define the chloroform plume. <br /> Task 6 <br /> Install a monitoring well to a depth between 100 and 150 feet in the <br /> vicinity of BC12 and BC13. This well will be developed, slug-tested, <br /> and sampled for chloroform. Water level data will be obtained for <br /> use in accomplishing Task 2. The well will be monitored during <br /> performance of Task 3. Data from the well will be used in <br /> performance of Tasks 4 and 5. <br /> Brown and Caldwell is prepared to begin well installation immediately <br /> following approval of this plan and well locations by all of the <br /> concerned agencies . To facilitate well installation, we will file <br /> well permit applications with the San Joaquin Local Health District <br /> and notify our drilling subcontractors of this upcoming work by <br /> January 10, 1986. <br /> We appreciate providing this service to you. If you have any <br /> questions, please contact me. <br /> Very truly yours, <br /> BROWN AND CCALDWELL <br /> n <br /> Thomas K. Wheeler <br /> Project Manager <br /> GMW: lah <br /> Enclosure <br /> cc : Mr. Renaldo Crooks , San Joaquin Local Health District, Stockton <br /> Mr. Doug Dutton, Georgia-Pacific Corporation, Atlanta <br /> Mr. Mike Locke, City of Tracy <br /> Mr. Ivan Shaffer, Georgia-Pacific Corporation, Tracy <br /> Mr. Dan Ward, Regional Water Quality Control Board <br /> BROWN AND CALDWELL <br /> �. P09OYRnAS WAINI IT rP"K CA R4SRR.1PPn• 414 CI17.M+n TF1 FY]1-RARn•OFF ICF AT 9ARn RUSK IRK AVFNI IF PI.FAS ANT RI I I P45PI <br />