SITE INFORMATION AND CORRESPONDENCE_FILE 2

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a ' UniFirst Corporation page 2 819 N. Hunter St, Stockton Since the UST contamination was discovered, SJCEHD has commented on the required investigation to determine the extent of the contamination from the UST. SJCEHD discussed with the CVRWQCB that there were separate areas of contamination at the site. Therefore, SJCEHD could refer the site to the CVRWQCB for oversight now or SJCEHD could maintain oversight on the UST contamination and refer oversight later. It was decided that since ground water is shallow, a ground water investigation for the UST are would be required. In order to determine if the chemicals detected in the shallow soil around the UST have migrated laterally or vertically, you will be required to submit a work plan for additional soil and a ground water investigation. The work plan should include soil sample collection thru the UST pit area down to and thru the first ground water beneath the site. Soil and ground water samples should be collected in adequate numbers to support conclusions for migration limits or potential. As an 'unknown' UST, required investigations include soil and ground water sample collection and laboratory analyses contained within the Tri-Regional Board Staff Recommendations for Preliminary Investigation and Evaluation of Underground storage Tanks Sites —April 16, 2004. Selected soil and all ground water samples should be analyzed for the following: • Gasoline by 8015m or 8260B • Diesel by 8015m • Volatile Organic Compounds (VOC) by 8260B • Semi-VOCs by 8270C • Oil & Grease by 1664A • PCBs by 8082 • Title 22 Metals SJCEHD requires monitoring wells be placed onsite. One of the monitoring wells is to be placed in the former UST pit area and an adequate number of monitoring wells should be installed around the site to provide for gradient and water quality data collection points. The work plan should be submitted to SJCEHD within 45- days. SJCEHD will review the work plan and comment in writing. Once approved, a boring permit application and $89 fee should be submitted to SJCEHD within 30- days. Permit application forms are available on our website, www.sigov.org/ehd. Follow directions under Forms and Well Permit Application (LOP) listings.