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PUBLIC HEALTH SERVICES <br /> OPO.0 IN C <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION r. <br /> Ernest M. Fujimoto, M. D., M.P.H., Acting Health Officer <br /> 304 E. Weber Ave., Third Floor • P. O. Box 388 • Stockton, CA 95201-0388 • °q ;Foa� " <br /> 209/468-3420 <br /> JEFF GRANBERRY 00 ` V, <br /> SHELL OIL CO MAILED NOV 14199c <br /> P O BOX 4023 <br /> CONCORD CA 94524 <br /> RE: VICTOR ROAD SHELL SITE CODE: 1746 <br /> 880 VICTOR ROAD <br /> CONCORD CA 94542 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) has <br /> reviewed the September 13, 1995 Site Investigation Workplan prepared by Fugro West, Inc. of <br /> Roseville California for the above referenced site. <br /> The workplan was prepared in response to the PHS/EHD letter dated August 14, 1995 which <br /> requests that the extent of contamination in two sample locations be defined. In the letter <br /> PHS/EHD requests additional information from the area of sample 2NSW/17 and TP 1/21. Of <br /> the three areas of proposed investigation indicated in the Fugro workplan only one is in a <br /> location which would provide the necessary information to define the extent of contamination <br /> where that information is not already available. This is the boring located in the area of <br /> 2NSW/17. <br /> The area of TPI/21 has not been addressed in this workplan. This sample location is now <br /> beneath the eastern newly installed 15,000 gallon UST. In order to obtain a sample from this <br /> location it may be necessary to use an angle boring. <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 proposed GeoProbe work <br /> additional soil borings be completed so that the lateral extent of contamination is defined during <br /> 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 soil samples to analyze are crucial to accurately calculating <br /> this mass balance. <br /> A Division of San Joaquin County Health Care Services <br />