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BLAINE <br /> TECH SERVICES <br /> GROUNDWATER SAMPLING SPECIALISTS <br /> SINCE 1965 <br /> May 13, 2005 <br /> Karen Petryna <br /> Shell Oil Products US <br /> 20945 South Wilmington Avenue <br /> Carson, CA 90810 <br /> Second Quarter 2005 Groundwater Monitoring at <br /> Former Shell Service Station <br /> 2575 Country Club <br /> Stockton, CA <br /> • Monitoring performed on February 15, March 21, and April <br /> 21, 2005 <br /> Groundwater Monitoring Report 050421-BS-2 <br /> This report covers the routine monitoring of groundwater wells at this former Shell facility In <br /> accordance with standard procedures that conform to Regional Water Quality Control Board <br /> requirements,routine field data collection includes depth to water,total well depth, thickness of <br /> any separate immiscible layer, water column volume, calculated purge volume (if applicable), <br /> elapsed evacuation time (if applicable), total volume of water removed (if applicable), and <br /> standard water parameter instrument readings Sample material is collected, contained, stored, <br /> and transported to the laboratory in conformance with EPA standards Purgewater(if applicable) <br /> is, likewise, collected and transported to the Martinez Refining Company <br /> Basic field information is presented alongside analytical values excerpted from the laboratory <br /> report in the cumulative table of WELL CONCENTRATIONS The full analytical report for <br /> the most recent samples and the field data sheets are attached to this report <br /> At a minimum, Blaine Tech Services, Inc field personnel are certified on completion of a forty_ <br /> . hour Hazardous Materials and Emergency Response training course per 29 CFR 1910 120 Field <br /> personnel are also enrolled in annual eight-hour refresher courses <br /> sm ioee WEMEM Lm mean SSh nrcoc <br /> ISAM AOS R AWNUE MA JO e,CK W0.1108 (4W SYS4MM FAX (40s)117a-7771 UC 7466" www olalnRuae con, <br />