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' Diamond Lumber-Lodi Quarterly Groundwater Monitoring Page 1 <br /> 1.0 INTRODUCTION <br /> Steffen Robertson and Kirsten (U.S.) Inc., (SRK) has been retained by the 650 Management <br /> Corporation (current management of Diamond Lumber, Inc.) to perform the quarterly groundwater <br /> monitoring of three monitoring wells installed by SRK at the former Diamond Lumber facility located <br /> at 151 South Main Street, Manteca, California. The Scope of Work includes sampling three <br /> groundwater monitoring wells to investigate the potential for groundwater contaminant migration from <br /> a former underground storage tank location from which a tank or tanks were removed in 1985. Three <br /> groundwater monitoring wells were installed by SRK in November, 1991, under the direct guidance of <br /> Ms. Margaret Lagorio, Senior REHS, San Joaquin County Public Health Services/Environmental <br /> Health Division (PHS/EHD). Specific information regarding subsurface soil conditions and monitoring <br /> well construction details is presented in SRK's Phase H Environmental Audit Report for this site dated <br /> December 1991. <br /> This report addresses work activities completed on February 4, 1993, and represents the fourth <br /> monitoring event at this facility. The quarterly groundwater sampling activities were performed by fully <br /> qualified SRK professionals under the technical guidance and direct supervision of Rob D. Gwilym, <br /> an Environmental Geoscientist and registered Environmental Professional (NAEP 1792)also registered <br /> as an Environmental Geoscientist and registered as an Environmental Assessor in California (0035), <br /> and certified by the American Institute of Professional Geologists (4529). Geologic and hydrogeologic <br /> aspects were completed under supervision and guidance of Greg W. Knell, California Registered <br /> Geologist 4692. t ?^ <br /> GREGORY IN.KNELL <br /> � 0.4692 <br /> �FOF CAO�� <br /> of cNuF <br /> 2A SCOPE OF SERVICES <br /> The scope of work for the Quarterly Groundwater Monitoring includes: <br /> • Measuring the static water level relative to the top of casing. <br /> • Purging and sampling the wells according to PHS/EHD guidelines. <br /> • Shipping the groundwater samples under correct chain-of-custody procedures to a California <br /> ' licensed laboratory for analyses. <br /> • Reporting the analytical results and supplying comparisons between these results and those <br /> from earlier monitoring events. <br /> • Performing a records search of registered wells located within 2,000 feet of the site. <br /> • Estimating the localized groundwater gradient. <br /> ' 3xso.,i.�-avr. ea Steffen Robertson and Kirsten <br />