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i <br /> ARCO <br /> Page 2 of 2 <br /> The report of this work should include a cross section diagram which shows the <br /> contamination plume, based on data obtained during all the investigations of this site. It <br /> should also include a three-dimensional diagram of the plume and the associated <br /> lithoiogy. A rose gradient diagram depicting historical ground water gradient directions <br /> should be prepared and updated with each quarterly monitoring event. <br /> The need for additional monitoring wells will be evaluated after this investigation. <br /> Continue quarterly sampling and reporting; analyze for the five oxygenates discussed <br /> during the February 18, 1998 meeting, using method 8260. If you have any questions <br /> contact Carol Oz at (249)468-3440. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> Carol Oz, Senior REHS Margaret ago o, S <br /> Site Mitigation Unit ' Supervisor <br /> cc: RWQCB, Central Valley Region-Pat Anderson <br /> EMCON-Jay Johnson, Joel Coffman <br />