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Mr. Don O. Culbertson -2- 18 October 1,994 <br /> i <br /> Page 8 of-the work plan then states, "Soil samples will be collected for chemical analysis at a depth <br /> Of seven feet at each location, because previous data indicate that maximum concentrations of TPH <br /> were detected at an approximate depth of seven feet." However, to determine the potential effect on <br /> water quality, the entire vertical extent of soil contamination needs to be defined, not just at seven <br /> feet. <br /> Water Quality Evaluation <br /> Apart from the SHRA, a water quality model should be developed, using existing data, to identify <br /> the potential for hydrocarbons in the soil to migrate into the ground water if the soil is left in place. <br /> t e entire site database should be used in this evaluation, including all available data from test pits, <br /> trenches, soil borings, momtonr�g wells, ktockpiles anci drums:-• i ce-r ode shvuid-cons�Icr relevant <br /> factors such as constituent concentration levels, precipitation leaching, soil permeability, depth to <br /> ground water, seasonal ground water elevation changes, and constituent migration by leaching, <br /> gravity flow, and diffusion. <br /> We have received the summary of all soil and ground water data collected at the site, prepared by <br /> Geomatrix Consultants. We will review that submittal and send you a draft monitoring and <br /> reporting program for your review. <br /> By 14 November 1994, please respond to these comments and submit a sampling plan for the <br /> stockpiled soils and trenches. If you have any questions, you may call me at (916) 255-3141. <br /> D. MOODY <br /> Project Engineer <br /> JDM:jdm\lsb <br /> cc: Mr. Mike Infurna, San Joaquin County Public Health Services, Stockton <br /> Ms. Karen Lew, Texaco Trading & Transportation Inc., Bakersfield <br /> Ms. Dawn Zemo, Geomatrix Consultants Inc., San Francisco <br />