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October 18, 2013 <br /> San Joaquin County <br /> Environmental Health Department <br /> 1868 East Hazelton Avenue <br /> Stockton, California 95205-6232 <br /> Subject: Work Plan for Well and Boring Permit Application <br /> 16101 Schulte Road <br /> Tracy, California <br /> Versar Project No. 110712.0003.001 <br /> To Whom It May Concern: <br /> On September 6, 2013 five geotechnical borings were drilled along the southern boundary of <br /> 16101 Schulte Road, APN 209-22-04. A gasoline odor was noted in depth intervals of two <br /> borings at 15, 35 and 50 feet below ground surface (bgs). Because the purpose of these <br /> borings was geotechnical, field personnel were not prepared to provide proper environmental <br /> characterization of the samples. <br /> Versar proposes to advance two soil borings adjacent to the location of the two borings where <br /> the gasoline odor was detected; one to 50 feet and one to 40 feet. The 50-foot boring will be <br /> continuously cored from 40 to 50 feet bgs. The 40-foot boring will be continuously cored from <br /> 10 to 20 feet and from 25 to 35 feet bgs. The purpose of the work is to assess if nearby <br /> petroleum pipelines have leaked. Two soil samples from each boring will be collected within <br /> the depth interval where odors were previously encountered and analyzed for total petroleum <br /> hydrocarbons in the gasoline through oil ranges by EPA Method 8260/8021 and 8015. Each <br /> boring will also be sampled at 5 and 10 feet bgs to document the source was not from surface <br /> spillage. Groundwater is not anticipated to be encountered; however, if encountered Versar <br /> will collect a grab-groundwater sample if enough water is present. <br /> Per San Joaquin County Environmental Health Department requirements, each boring will be <br /> backfilled with grout using a tremie pipe to 5 feet bgs and finished to match the surrounding <br /> surface (dirt). <br /> If you wish to discuss or have any questions pertaining to the information presented in this <br /> letter, please contact me at(916) 863-9323 and beroer@versar.com. <br /> Sincerely, <br /> Tim Berger, P.G., R.E.A. <br /> Program Manager <br /> Southwest Division <br /> i <br /> 5330 Primrose Drive,Suite 147 <br /> Fair Oaks,CA 95628 j <br /> 916.962.1612 <br /> LV E R 'S A R www.versar.com <br />