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AWAkLM <br /> . Working To Restore Nature <br /> 1710 Main Street <br /> Escalon, CA 95320 <br /> Phone: (209) 838-3507 <br /> FAX: (209) 838-3509 <br /> July 2 , 1994 <br /> Ms. Beth Thayer <br /> Central Valley Regional Water Quality Control Board <br /> 3443 Routier Road, Suite A <br /> Sacramento, CA 95827-3098 <br /> RE: Nor-Cal Beverage, 1800 E. Fremont St. , Stockton, CA <br /> Dear Ms. Thayer, <br /> I am writing to discuss several technical aspects of the <br /> underground tank case at the above mentioned site and to address <br /> comments made in the January 1, 1994 letter from the San Joaquin <br /> County Environmental Health Division to Mr. Peter Ruhkala <br /> (attached) . I have spoken to Mr. Steve Sasson of the County and <br /> he suggested these comments be addressed to you since they focus <br /> exclusively on closure issues. <br /> • In the September 22 , 1993 letter from Mr. Braunstein of your office <br /> to Mr. Ruhkula it was indicated that the San Joaquin County EHD had <br /> requested your concurrence in closure of this site, however, <br /> additional information was needed to consider closure. <br /> Specifically, Mr. Braunstein asked for a survey of water supply <br /> wells within one mile of the site and an explanation of the method <br /> for determining the groundwater gradient. He also stated concerns <br /> regarding gradient fluctuations at a nearby site (2185 East <br /> Fremont) . Mr. Ruhkula then contracted for additional work to <br /> address these concerns. This work is summarized in the December <br /> 20, 1993 letter from RESNA to Ms. Diane Hinson of SJEHD (copy <br /> attached) . The conclusion of this letter is that the hydropunch <br /> sample located north-northwest of the tank site was appropriately <br /> located to evaluate downgradient movement of contaminants <br /> associated with the former release. Therefore, closure was again <br /> requested. Although a response has not been received from your <br /> office, SJEHD did respond with two specific concerns as listed <br /> below: <br /> 1. Levels of TEX detected in MW-1 must be cleaned up to less than <br /> 0. 5 ppb in order to be in compliance with SWRCB Resolution x'92-49 . <br /> 2 . Although all of the site files in the vicinity of Nor-Cal <br /> Beverage (which were requested of and provided by SJEHD) were <br /> consistent with a northerly gradient at Nor-Cal, a site which was <br /> not provided to RESNA in response to our request and which is in <br /> close proximity to Nor-Cal has shown a east-southeast gradient. <br />