SITE INFORMATION AND CORRESPONDENCE

Home Browse Search

i v San Joaquin County Environmental Health Department 600 East Main Street Stockton, California 95202-3029 Website; www.sjgov.org/ehd Phone: (209) 468-3420 Fax: (209) 464-0138 March 21, 2012 Mr. Donald Helsel Earthgrains Baking Companies, Inc. 2651 South Airport Way Stockton, California 95206 Mr. Christopher Wolfe Earthgrains Baking Companies, Inc. 249 North 11th Street Sunbury, Pennsylvania 17801 DIRECTOR Donna Heran, REHS PROGRAM COORDINATORS Robert McClellon, REHS Jeff Carruesco, REHS, RDI Kasey Foley, REHS Linda Turkatte, REHS Anheuser-Busch Companies One Busch Place St. Louis, Missouri 63118 Ms. Kacey Fung Earthgrains Baking Companies, Inc. 3500 Lacey Road Downers Grove, Illinois 60515-5424 Subject: Earthgrains Baking Companies, Inc. (Former Rainbo Baking Company) 2651 South Airport Way Stockton, California 95206 The San Joaquin County Environmental Health Department (EHD) has reviewed Well Destruction Work Plan, dated 20 February 2012, prepared by your consulting firm, PSC Industrial Outsourcing, LP (PSC) for the above -referenced site. The work plan was submitted in response to the EHD letter dated 26 January 2012 directing the submittal of a scope of work proposal to destroy the twenty-three wells at this site. In the work plan, PSG proposes to destroy the wells by over-drilling the well boreholes to total depth and removing the well casing. Please note that the EHD expects all the contents of the well, including the filter pack and grout sealant, as well as the well casing, to be removed when destroying the wells by over-drilling. PSC proposes to first destroy the wells with no contaminants of concern present in the groundwater, followed by the wells with known petroleum contaminants in the groundwater. Based on this approach, the EHD suggests that monitoring well MW -8 and air sparing well SP -5 be included in the later group since low concentrations of contaminants of concern were detected in groundwater when last these wells were sampled. Also, PSC proposes to grout the borehole under pressure by placing a tremie rod inside the hollow -stem augers, and once the boreholes have been grouted to thirty feet below ground surface (bgs), grout the remaining borehole by gravity feed. Please note that if groundwater is present in the borehole above thirty feet bgs, the grout must be inserted with a tremie pipe or equivalent, and not gravity fed. The EHD approves the work plan with these conditions. Please note that EHD records indicate that vapor well VW -1 was Installed to forty feet bgs using ten -inch augers; sparge well SP -A was installed to 73 feet bgs using eight -inch augers: and the total depths for monitoring wells MW -4 and MW -5 are 55 feet bgs.