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PUBLIC EALTH SERY C S <br /> o�Q....N...� <br /> SAN JOAQUIN COUNTY <br /> S <br /> gr -4 <br /> ENVIRONMENTAL HEALTH DIVISION .X <br /> Ernest M. Fujimoto, M. D., M.P.H., Acting Health Officer <br /> 304 E. Weber Ave., Third Floor * P. O. Box 388 o Stockton, CA 95201-0388 <br /> 209/468-3420 <br /> JOHN STROH A 5!E-P 11 8Q6 <br /> SAN JOAQUIN MOSQUITO ABATEMENT DISTRICT;; <br /> 7759 SOUTH AIRPORT WAY <br /> STOCKTON CA 95206 <br /> Re: San Joaquin Mosquito Abatement District Site Code: 1849 <br /> 200 North Beckman <br /> Lodi CA 95240 <br /> iii <br /> San Joaquin County Public Health Services, Environmental',Health Division <br /> (PHS/EHD) has completed review of the "Work Plan for Site Investigation and <br /> Groundwater Sampling" dated August 1996 and prepared by Weston. PHS/EHD has <br /> the following comments for your consideration. <br /> li <br /> The work plan proposed the installation of an additional monitoring well, MW5, to <br /> replace the destroyed MW2 and MW3 to ascertain groundikater gradient and to <br /> 11 <br /> further investigate residual soil contamination evidenced in 1 soil samples BH31 and <br /> S132. The work plan indicated that only two soil samples would be submitted for <br /> :' ifted for analysis since <br /> laboratory analysis. Additional soil samples should be submitted <br /> sidewall samples were not collected during the 1986 excavation and soil <br /> contamination was detected at 20 and 50 feet (not atJ55') in the soil samples <br /> submitted from SB2. This soil boring/monitoring well ,will serve several purposes; <br /> therefore, it is essential that sufficient information is obtain el'd to assess the residual <br /> soil contamination and groundwater quality. As resid6al soil il contamination exists, an <br /> evaluation of the threat to groundwater that the contamination poses is necessary. <br /> Please consider analysis to establish site specific lith6logical information that can be <br /> used to evaluate the environmental fate of the residua" I contamination. <br /> Groundwater samples have not been obtained from MW1 since August 1992. MW1 <br /> is constructed with the screened interval from 30 to 55 <br /> 5 feet below ground surface. <br /> Groundwater samples have not been obtained from MW4 since January 1993. MW4 <br /> is constructed with the screened interval from 50 to 76 feet below ground surface. As <br /> you know the groundwater table has risen in the last�couple of years and it is likely <br /> that MW1 contains sufficient groundwater to sample. 11I <br /> Enclosed is permit #010429 issued to Woodward Drilling. Please contact me at least <br /> two working days prior to implementing the work planj so that site inspections can be <br /> scheduled. Also, following the completion of the investigation, you must contact me <br /> to discuss which soil samples will be submitted for laboratory analysis. <br /> A Division of San Joaquin Countv Health Care Services <br />