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Jeff Granberry Page 2 <br /> Fugro proposes to submit the two deepest soil samples from each boring to a state certified <br /> analytical laboratory for analysis. PHS/EHD recommends that samples submitted for analysis, <br /> to obtain data for vertical definition of the soil contamination, should be the shallowest samples <br /> which appear to be free of contamination, based upon field screening. <br /> PHS/EHD recommends that if contamination is encountered during the initial GeoProbing, that <br /> additional GeoProbe borings be completed, so that the lateral extent of the contamination is <br /> defined during this phase of work. <br /> With the information obtained during this phase of work, a mass balance of total petroleum <br /> hydrocarbons remaining in place at this site should be calculated. The proper placement of soil. <br /> borings, as well as deciding which samples to analyze, is crucial to accurately calculating this <br /> mass balance. <br /> In order for this workplan to remain in compliance with Article 11, Chapter 16, Division 3, <br /> Title 23 of the California Code of Regulations the Corrective Action Regulations, PHS/EHD <br /> requires that an addendum to the workplan be submitted by November 30, 1995. <br /> In order to reduce costs in this investigation, PHS/EHD recommends that the data required to <br /> adequately characterize the contamination at this site, be obtained in one mobilization. <br /> For further information, please contact Steven Sasson at (209) 468-3459. <br /> i <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> Steven Sasson, Senior REHS Diane M. Hinson, REHS <br /> Site Mitigation Unit Supervisor <br /> SS <br /> cc: SWRCB - Underground Storage Tank Section - Lori Casias <br /> cc: RWQCB - Elizabeth Thayer <br /> cc: Fugro West - Steve Osborne <br /> 4 <br /> E <br />