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PUBLIC HEALTH SERVICES oPa�tN <br /> SAN JOAQUIN COUNTY <br /> m <br /> ENVIRONMENTAL HEALTH DIVISION T < <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 `'< FoaNsP <br /> 209/468-3420 <br /> I 24-119Y <br /> CRICHARD CALLISTRO ML <br /> SAN JOAQUIN COUNTY CAPITAL PROJECTS <br /> 222 E WEBER AVE RM 678 <br /> STOCKTON CA 95202 <br /> RE: San Joaquin County Human Services Building SITE CODE: 1257 <br /> 145 South Sutter Street <br /> Stockton CA 95202 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) staff <br /> attended a meeting with you and Ellen Aquaro of Capital Projects and Karla Brasaemle of <br /> Weston on January 12, 1996 . PHS/EHD has the prepared the following summary for your <br /> information. <br /> Groundwater Sampling <br /> The frequency of sampling some monitoring wells were reduced to annually for MW5 and <br /> semi-annually for MW4, MW6 and MW7, since groundwater contamination has not been <br /> detected in those wells since October 1993. Sampling of MW2A will continue on a quarterly <br /> basis. Monitoring wells, MW1 and MW3, have been destroyed and MW2 has been dry for <br /> several years. Sampling of MW8 will be temporarily suspended until potential offsite sources <br /> have been investigated. <br /> Residual Soil Contamination <br /> It was agreed that additional soil investigation was necessary to determine the southern and <br /> eastern vertical extent of residual soil contamination so that the potential threat which may be <br /> posed to groundwater can be evaluated. PHS/EHD agreed that, based on available <br /> information, soil boring BH5 provides data to suggest that the western extent of soil <br /> contamination has been defined. <br /> PHS/EHD agreed that sufficient notification was not provided to the consultant at the time of <br /> drilling so that soil samples would be collected beneath the water table. Technical issues <br /> associated with sampling beneath free product were discussed; however resolution was not <br /> achieved. PHS/EHD indicated that sampling beneath the groundwater may be required in the <br /> future and that should free product be observed, the analytical results obtained from samples <br /> collected, will be evaluated with consideration given to actual site conditions. <br /> Groundwater Contamination <br /> It was agreed that additional groundwater investigation was necessary to determine the <br /> southern extent of groundwater contamination. PHS/EHD was informed that the collection of <br /> a groundwater grab sample from a proposed soil boring would be evaluated and possibly <br /> included in the work plan that will be submitted. <br /> A Division of San Joaquin Counts Health Care Services <br />