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i <br /> '1 <br /> PUBLIC ��IEALTH SERVICES a�,N <br /> SAN JOAQUIN COUNTY Q &-, <br /> Z�ENVIRONMENTAL HEALTH DIVISIONErnest M. Fujimoto, M. D., M.P.H., Acting Health Officer304 E. Weber Ave., Third Floor • P. O. Box 388 • Stockton, CA 95201-0388 q,-�F4a <br /> 209/468-3420 <br /> JOHN AND MARGARET MARCI <br /> MARCIS DIESEL SERVICE <br /> 2973 LOOMIS ROAD <br /> STOCKTON CA 95205 <br /> RE: 2969 LOOMIS ROAD SITE CODE: 2015 <br /> STOCKTON CA <br /> San Joaquin County Public Health Services, Environmental Health Division <br /> (PHS-EHD) has completed the review of the "Interim Investigation Report" dated <br /> August 17, 1996 and offers the following comments. <br /> Although the site map in the report shows the soil boring location to be outside of <br /> the former tank pit area, PHS-EHD field staff notes and the text of the report <br /> place the location down through the former tank pit area. As such, the full extent <br /> of the soil plume configuration can be reasonably inferred from the data from soil <br /> boring #1 and monitoring well #1. <br /> Although soil boring #1 revealed elevated levels of total petroleum hydrocarbons <br /> as diesel, the groundwater historically has not shown correspondingly elevated <br /> levels, generally supporting the conclusion in the report that the plume migration <br /> is limited by the low soil permeability. However, it is unfortunate that soil <br /> samples were not analyzed for the physical parameters typically used in fate and <br /> transport models, as requested in the November 30, 1995 letter to you from <br /> PHS-EHD. The use of fate and transport calculations or computer models lends <br /> a higher degree of confidence of the fate of a plume in the future, especially in <br /> situations where a substantial soil plume is proposed to be left in place. <br /> However, based on the historic low and nondetectable levels in groundwater <br /> over the past four years, PHS-EHD concurs with the recommendations of your <br /> consultant, William Hunter, to gather current groundwater quality data. However, <br /> only M/\/#1 should be sampled, as the other two wells would not provide any <br /> beneficial data for the cost. <br /> A Division of San Joaquin County Health Care Services <br />