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PUBLIOr" 1EALTH SERVICES <br /> a�dN <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Ernest M. Fujimoto, M. D., M.P.H., Acting Health Officer <br /> 304 E. Weber Ave., Third Floor • R O. Box 388 • Stockton, CA 95201-0388 <br /> 2091468-3420 <br /> U <br /> GEORGE TAKEMORI C (a <br /> A TEICHERT AND SONS INC SEP 2 6 ISS <br /> P O BOX 15002 <br /> SACRAMENTO CA 95851 <br /> RE: 103 N E STREET SITE CODE: 1555 <br /> STOCKTON CA <br /> San Joaquin County Public Health Services, Environmental Health Division <br /> (PHS-EHD) has completed the review of the "Second Quarter 1996 Status and <br /> Site Closure Report" dated August 15, 1996 and offers the following comments <br /> for your consideration. <br /> The report presented an estimate of the mass of hydrocarbons prior to and after <br /> the remediation at the site, a list and a map of nearby wells, and a request for <br /> closure based on the opinion that natural biodegradation will further reduce the <br /> residual and dissolved petroleum hydrocarbons at the site. These items alone <br /> are not sufficient to support a closure for this site at this time. <br /> Although the mass estimates may be adequate, these data should be presented <br /> in lithological cross sections as well. The cross sections should show the nature <br /> and extent of the soil and groundwater plumes at the site and the impact of these <br /> plumes on the groundwater system. Therefore, the mass of hydrocarbons at and <br /> below the water table must also be considered. It may be necessary to obtain <br /> confirmation soil samples in recently remediated areas and in areas of data gaps <br /> to effectively present this information. <br /> The fate of the contaminant mass was not discussed in the report and is <br /> essential to the closure decision malting process. To achieve a closure at this <br /> site the current and future beneficial uses of the groundwater and the affect of <br /> the contaminant mass on these uses, now and in the future, must be presented <br /> and discussed. To understand the future potential affect of the contaminant <br /> mass on groundwater uses, the future fate of the plume must be discussed and <br /> supported, by representative groundwater sampling data and/or modeling. The <br /> groundwater data collected from this site may not by itself be sufficient to support <br /> w the opinion of plume stability or future fate estimates due to the fluctuations in <br /> the water table over time and the variations in the screened interval of the <br /> A Division of San Joaquin County Health Care Services <br />