SITE INFORMATION AND CORRESPONDENCE

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Antonia K. J. Vorster _2_ 13 June 1988 discharge requirements appear unnecessary at this time. A monitoring and reporting program should be adopted for the facility so that the effectiveness of the treatment system can be evaluated and the need for WDR or further action can be assessed. Ground Water Investigation Work Plan The work proposed in this work plan is a preliminary assessment of the source of the ground water contamination discovered in the area last year by AB 1803 staff. It is very possible that more investigative work on Triple E's part may be necessary to define the extend of the problem and to implement remedial actions. The plan calls for the construction of three monitoring wells as an initial step in investigating the presence and source of chloroform and for evaluating the ground water gradient. As proposed, this plan will not accomplish the above mentioned goals. The following discussion is a summary of the inadequate aspects of this report which should be addressed in an addendum to the Work Plan before work begins. Well Siting The main concern with this plan is the proposed siting of the two down gradient wells. The two wells, as proposed will be about 500 feet north of the suspected source and will be spaced relatively close together. Locating the downgradient wells as proposed, without more knowledge of the area will not produce useful initial investigation information and will make it difficult to verify the source. Not enough is known about the local hydrogeologic conditions to conclude anything about the source of pollution from wells this far away. Undetected conditions such as perched ground water may lead to false conclusions about the presence or absence of chloroform. Triple E should consider placing these wells closer to the suspect disposal pond. An added advantage to this placement would be the use of these wells for extraction purposes if necessary. The areal alignment of the three wells should be reconsidered also. The proposed alignment may make hydraulic gradient calculations difficult especially if the gradient is as flat as other gradients in the general vicinity. The locations of the wells should be modified sc that the source can be confirmed and the local gradient monitored.