SITE INFORMATION AND CORRESPONDENCE

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i f Ragu Foods, Inc. 1 400 WATERLOO ROAD, P. O. BOX 9200 STOCKTON , CA 95208 December 9, 1987 e Mr. Dan Moe Environmental Health Division( ,, �� San Joaquin Local Health District V �'\ P� 1601 East Hazelton Avenue 'k P. 0. Box 2009 �c;S Stockton, California 95201 �J , 4 Dear Mr. Moe: �� 4`R\\1 We apologize for our delay in responding to your telephone discussion with Larry Hall on June 3, 1987, relating to the further subsurface investigation of diesel residues at the Ragu Foods, Inc. , 1400 Waterloo Road, Stockton, Ca. Prior to that conversation, the results of the previous investigation and recommendations had been submitted to the County by a letter from Larry Hall dated April 28, 1987. We understand you had indicated that the County would want three (3) monitoring wells installed instead of the one proposed. This letter is to confirm our under- standing of the monitoring program that the County desires to be implemented. The County has concern about the determination of the ground water quality and the direction of ground water flow, in particular for the purposes of the determination of the direction of ground water flow it is necessary to install three (3) ground water monitoring wells. These wells need not be immediately adjacent to the former tank site, but should be located relatively close to the site. The wells should be screened from 10 feet above the water table to 20 feet below the top of the water table. The 20 foot depth of well screen below the water table may be reduced if an underlying clay of greater than 5 'feet thick is encountered. Once the wells are installed water samples will be collected and analyzed for benzene, xylene, toulene, and total fuel hydrocarbon content. Additionally , the wells will be checked for the presence of floating product. In general, there is no particular objection to the installation of the above program, provided that the setting of the well screens can be tailored to meet the sites geology. There is no desire to penetrate through confining layers, thus creating the potential for the inadvertent contamination of underlying aquifers. We have selected three sites for the installation of monitoring wells, as shown on the attached drawing. The orientation of the wells at 120 degrees apart is ideally suited to the determination of the direction of ground water flow. The wells will be located about 60 feet from the tank site in areas that should provide some security from heavy truck traffic. s u 8 S 1 o1A R r OF