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PUBLIC r IEALTH SERV10ES 'o 0U!/V <br /> SAN JOAQUIN COUNTY 2i <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Ernest M. Fujimoto, M. D., M.P.H., Acting Health Officer <br /> c <br /> 304 E. Weber Ave., Third Floor • P. O. Box 388 • Stockton, CA 95201-0 " cF <br /> 209/468-34207 <br /> �211� <br /> ELLEN AQUARO MAILED APR 111996 <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) has <br /> completed review of the Weston "Work Plan for Phase IV Site Investigation and Quarterly <br /> Groundwater Sampling" dated February 1996. PHS/EHD has the following comments for <br /> your consideration. <br /> Work Plan <br /> The work plan proposed to install an additional monitoring well (MW) south of MW2A and to <br /> drill and sample borehole (BH) BH13. <br /> It was agreed during the January 12, 1996 meeting that additional soil investigation was <br /> necessary to determine the southern and eastern vertical extent of residual soil contamination <br /> so that the potential threat which may be posed to groundwater can be evaluated. It is likely <br /> that an additional soil boring will be necessary between BH8 and BH9. <br /> The work plan indicated that BH13 would be drilled to 60 feet below grade and filled with <br /> sand or pea gravel to the groundwater level, then grouted. Please note that instead of using <br /> sand or pea gravel, bentonite pellets should be used to fill the void between the total depth of <br /> the borehole and the depth to groundwater. <br /> Please contact PHS/EHD to discuss sample submittal for laboratory analysis following the <br /> drilling activities. Sufficient soil samples should be submitted to define the vertical and <br /> horizontal extent of soil contamination. <br /> Permitting <br /> PHS/EHD has received correspondence indicating that Weston had initiated permitting <br /> through the City of Stockton Department of Public Works, presumably for BH13. <br /> PHS/EHD did indicate during the January 12, 1996 meeting, that should it be necessary, <br /> PHS/EHD would provide assistance with working with Caltrans to obtain an encroachment <br /> permit. Please note, that PHS/EHD did not suggest that permission from Caltrans to install <br /> MW9 would be obtained through PHS/EHD. Please contact Bill D. LaMascus, Caltrans <br /> Regional Permit Engineer, at (209) 948-3656 for information regarding encroachment <br /> permitting. <br /> A Division of San Joayum County Health Care Services <br />