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PUBLIC -!- EALTH SERNPICES <br /> PgUlp <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 • P. O. Box 388 • Stockton, CA 95 c n <br /> n 0 • "q<' .o.RN P <br /> 209/468-3420 <br /> DAVID CAMILLE MAILED �`�`�IJ==/JUNIU2 44 1996 <br /> UNOCAL CORPORATION <br /> PO BOX 5155 <br /> SAN RAMON CA 94583 <br /> RE: Unocal Service Station #6981 SITE CODE: 1217-123 <br /> 4707 Pacific Avenue <br /> Stockton CA <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) has <br /> completed review of the MPDS "Quarterly Data Report" dated May 29, 1996. PHS/EHD <br /> has prepared the following comments for your consideration. <br /> The average groundwater depth, as monitored on April 25, 1996, was approximately 37 <br /> feet below ground surface, representing an approximate 5 feet rise, since the prior <br /> monitoring event on January 24, 1996. The seasonal high groundwater measurement for <br /> the area where the site is located, was reported in 1986 by San Joaquin County Flood <br /> Control District, at approximately 30-35 feet below ground surface. <br /> As PHS/EHD stated in correspondence dated March 27, 1996, additional monitoring wells <br /> will be required to characterize the groundwater contamination, because the screened <br /> intervals of the existing monitoring wells were then approximately 10 feet lower than the <br /> depth that groundwater was first encountered. <br /> A work plan to install the additional monitoring wells necessary to characterize the <br /> groundwater beneath the site must be submitted by July 30, 1996. Along with the work <br /> plan, please submit a permit application and $89 permit fee. <br /> If you have any questions, please contact me at (209) 468-0337. <br /> Donna Heran, REHS, Director <br /> �Environmental Health Division p <br /> Mary Meays, Senior REHS Margaret aC gorio, REHSU <br /> Site Mitigation Unit Lead Senior <br /> MM\4707PAC <br /> cc: Elizabeth Thayer, CVRWQCB <br /> cc: Greg Gurss, GeoStrategies <br /> A Division of San Joaquin County Health Care Services <br />