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1 <br /> LIC HL`'ALTH SERVICES <br /> PT 2: r-t2a <br /> h: <br /> SAN JOAQUIN COUNTY , <br /> ENVIRONMENTAL HEALTH DIVISION <br /> IISIOFoa'P <br /> Karen Furst, M.D., M.P.H., Ce A 95201EE Co <br /> 304 East Weber Avenue, ThirdFloor <br /> • Stockton, C <br /> SEP 131999 <br /> PARMACEAST <br /> STEVEN RONZONE W, SIMMONS <br /> DEL MONTE FOODS C/O SIDNEY RUDY ESQ <br /> PO BOX 193575 333 MARKET STE 2300 <br /> SAN FRANCISCO CA 94119-3575 SAN FRANCISCO CA 94105 <br /> RE: COMPLIANCE AND SITE CHARACTERIZATION <br /> SITE CODE: 2498 <br /> DEL MONTE/DISCO SITE <br /> 110 FILBERT STREET <br /> STOCKTON CA <br /> San Joaquin County Public Health Services Environmental Health Division (PHS/EHD) <br /> has completed a review of the most recent workplan (August 17, 1999) submitted by <br /> CH2M HILL on behalf of Del Monte. PHS/EHD provides the following comments and <br /> directives. <br /> Through corrective action directives PHS/EHD has documented a laterally and vertically <br /> extensive soil and groundwater plume at the above referenced site. <br /> The August 17, 1999 CH2M HILL workplan fails to include reliable representative soil <br /> sampling and analyses in the vadose and saturated zones. The sampling frequency <br /> proposed at 40, 80 and 120' bgs would collect three 12" soil cores for a total of three feet <br /> of soil from each 120' tall soil column representing less than three percent of the <br /> borehole height (97% unknown). Typical soil collection frequency is once every five foot <br /> vertically. PHS/EHD now directs the responsible parties to include soil sampling and <br /> analyses in the vadose and saturated zone in each borehole installed. The frequency and <br /> distribution of sample collection and analyses shall be controlled by site specific <br /> hydrogeologic features. Upon completion of the approved continuous core boreholes by <br /> cone penetration testing, soil and groundwater samples shall be collected from each <br /> significantly different lithologic unit encountered vertically. The data collected shall be <br /> utilized in determining contaminant mass, receptor risk and remediation system design. <br /> The August 17, 1999 CH2M HILL workplan provides rationale for sampling which <br /> trends toward fate and transport input parameter data collection. Consistent with <br /> previous correspondence PHS/EHD strongly recommends the responsible parties collect <br /> complete chemical and geophysical data sets in order to prepare for remediation efforts <br /> recognizing the documented laterally and vertically extensive soil and groundwater <br /> plume at the above referenced site. At a minimum data collection should include <br /> laboratory derived permeability, porosity, dry bulk density, soil moisture, organic carbon <br /> 1 <br /> A Division of San Joaquin County Health Care Services <br />