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PUBLIC hEALTH SERVICES <br /> PQUIry <br /> SAN JOAQUIN COUNTY <br /> r. <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 95201-0388 c"4:/a6R' P <br /> 209/468-3420 <br /> v U <br /> RICHARD CALLISTRO <br /> SAN JOAQUIN COUNTY CAPITAL PROJECTS MAILED NOV 14199F <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) <br /> has completed review of the "Phase III Site Investigation Report" dated August 1995 and <br /> prepared by Weston. PHS/EHD has the following comments for your consideration. <br /> The report included the results of the July 1995 soil and groundwater investigation. Two <br /> replacement wells were installed, MW2A and MW3A, since both MW2 and MW3 have <br /> been dry for several years. However, only MW3 was destroyed because PHS/EHD <br /> requested that MW2 be retained for possible use during a further remediation effort. <br /> Figure 2 indicated that monitoring wells, MW1, MW2, and MW3 were destroyed. Please <br /> correct this figure and submit a revised Figure 2. <br /> The report also included correspondence from Nolte and Associates indicating the <br /> elevations of wells MW2A and MW3A, but failed to include a site map or reference points <br /> which are usually submitted with licensed surveyor's reports. <br /> Soil Investigation <br /> Soil contamination was observed during the installation of monitoring wells, MW2A and <br /> MW3A. Analytical results obtained from the samples submitted evidenced soil <br /> contamination in MW2A from 30 - 45 feet below ground surface. PHS/EHD staff <br /> requested that the soil samples obtained from below groundwater level be submitted for <br /> analysis, so that the mass of contamination could be estimated; since contamination <br /> adsorbed to soil and below the groundwater level will continue to leach into the <br /> groundwater. Samples were not collected below the groundwater level for laboratory <br /> analysis as requested. <br /> Table 2 contained incorrect information according to the Sequoia Analytical's lab report. <br /> Please note that 0.0091 mg/kg toluene was detected in the soil sample collected from <br /> MW2A at 45 feet and also it should be noted that this same sample's TPH-d analysis <br /> contained a footnote indicating that the 1.2 mg/kg was an unidentified hydrocarbon of <br /> <C13. A revision of Table 2 should be submitted. <br /> A Division of San Joaquin County Health Care Services <br />