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1, <br /> PUBLIC HEALTH SERV CES <br /> SAN JOAQUIN COUNTY " <br /> ENVIROINMENTAL HEALTH DIVISION ` <br /> Ernest M. Fujimoto, M.D., M.P.H., Acting Health Officer ... <br /> 4� FpRN <br /> 445 N. San Joaquin Street • P.O. Box 388 0 Stockton, CA 95201-0388 <br /> (209) 468-3420 <br /> ED ENDICH <br /> KEN ENDICH <br /> TOP FILLING STATION <br /> 101 S WILSON WAY <br /> STOCKTON CA 95205 <br /> 041994 <br /> RE: TOP FILLING STATION SITE CODE: 1294 <br /> 101 S WILSON WAY <br /> STOCKTON CA <br /> San Joaquin County Public Health Services, Environmental Health <br /> Division (PHS/EHD) has completed the review of the "Limited Soil <br /> and Groundwater Assessment" proposal dated June 24 , 1994 , <br /> submitted by Kleinfelder, and has the following comments for your <br /> consideration. <br /> The proposed two soil borings, one in the center of each former <br /> tank pit cavity, are not sufficient to investigate the full <br /> lateral extent of the contamination documented at the site. In <br /> addition to the proposed vertical investigative soil borings, <br /> additional soil borings must be proposed to investigate any <br /> potential lateral migration of hydrocarbons. <br /> Furthermore, analysis of only two soil samples from each boring <br /> is not sufficient to fully characterize the distribution and <br /> concentration of hydrocarbons in the soil. Preferably, every <br /> five foot soil sample should be submitted to the laboratory for <br /> analysis. In some cases the number of soil samples to be <br /> analyzed in the laboratory can be reduced based on measurements <br /> and observations noted during the field work. However, <br /> sufficient samples must be submitted for analysis so that an <br /> effective evaluation of the data can be made. Future <br /> investigative or remedial work at the site is determined almost <br /> exclusively from actual physical data. Measurements and <br /> observations made in the field can be used to help define a plume <br /> but only when supported with substantial physical data. <br /> A i)i,i,ion of San Joaquin Count} Health Care Services <br />