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' Stockton Plating Inc. <br /> Boil i Groundwater Investigation <br /> April 19, 1994 <br /> Page - 7 - <br /> and MW2, PID readings were approximately 10 parts per million <br /> (ppm) . Field screening of soil samples collected from MW3 <br />' detected organic vapors from 20 feet to 45 feet below the ground <br /> surface at concentrations ranging from 13 to 80 ppm (see <br /> geological logs, Appendix A) . <br /> I <br /> Three soil samples were collected from each boring for <br />' laboratory analyses (total 9 samples) . The soil samples were <br /> retained, undisturbed, in the brass liners . The liners were <br /> sealed at the ends with teflon tape, capped, wrapped with duct <br /> tape, and labeled. The samples were stored for shipment in a <br /> cooler chilled with Blue Ice and delivered within 24-hours of <br /> collection under chain-of-custody procedures to GeoAnalytical <br /> Laboratories, Inc . , in Modesto, California. <br /> r <br /> I4.2 Monitor Well Construction <br /> The wells were constructed of 4-inch O.D. , Schedule 40, <br /> machine-slotted PVC screen from a depth of 60 feet to 40 feet. <br /> Blank PVC casing was installed from a depth of 40 feet to the <br /> ground surface. The PVC casing and screen was steam cleaned <br /> Iprior to installation. A sand pack of #3 Monterey sand was <br /> placed in the annular space to approximately 2 feet above the <br /> screen. Approximately 2 feet of bentonite pellets were placed <br /> above the sand and hydrated with potable water to form a <br /> protective seal. A surface seal of neat cement containing S% <br /> 1 ao 1 <br /> Q�� CONDOR <br />