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'27282 Lone Tree Road <br /> San Joaquin County -2- 30 July 2013 <br /> Comments <br /> After our review of the Work Plan, we conditionally concur with the Work Plan subject to the following <br /> comments: <br /> 1. The Work Plan proposes to collect a minimum of three sail samples from four direct push <br /> borings. Apex needs to collect multiple soil samples from each of the borings B-1 through B-4. At a <br /> minimum,Apex needs to collect a sample from(1)just below the excavation depth (approximately 20 <br /> feet below ground surface, bgs); (2) near the capillary fringe(approximately 65-70 feet bgs); (3)the <br /> portion of each boring with the highest PID reading. <br /> 2. The Work Plan proposes to collect one down-gradient groundwater sample. Apex needs to <br /> collect a groundwater sample from the spill incident area to ensure that groundwater has not been <br /> impacted in the incident area. Locations B-1, B-2, and B-3 from the Proposed Soil Boring Location Map <br /> are the most preferable points from which to collect the additional groundwater sample. <br /> Please notify us at least 72 hours prior to sample collection so that we may have the opportunity to <br /> observe the work. Please submit a report of findings documenting the sample results by 18 October <br /> 2013. Feel free to contact me with any questions or concerns regarding this letter at 916. 464.4682 or <br /> roberto.cervantes@waterboards.ca.gov. <br /> Roberto Cervantes, Pr- <br /> Private Sites Cleanup Unit <br />