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GEOSYNTEC CONSULTANTS <br /> Ms. Amy Terrell <br /> 8 June 2001 <br /> Page 2 <br /> In summary, HRC is used to enhance in-situ biodegradation rates for chlorinated <br /> hydrocarbons by supporting anaerobic reductive dechlorination processes. HRC is a <br /> slow-dissolving, viscous gel composed of a proprietary, food-grade, polylactate ester <br /> produced by Regenesis of San Clemente, California. Upon injection into the <br /> subsurface, HRC slowly releases lactate. Lactate is metabolized by naturally occurring <br /> microorganisms, resulting in the creation of anaerobic aquifer conditions and the <br /> production of hydrogen. Naturally occurring microorganisms capable of reductive <br /> dechlorination then use the hydrogen to progressively remove chlorine atoms from <br /> chlorinated hydrocarbon contaminants (e.g., convert 1,2-DCP to 1-chloropropane and 2- <br /> chloropropane to propene). Details of the field test proposed at WFS Vernalis are <br /> provided below. <br /> Field Methods <br /> Activities associated with the pilot-scale field test of in-situ enhanced <br /> bioremediation include: <br /> • permitting; <br /> • updating the project health and safety plan; <br /> • monitoring well installation; <br /> • HRC injection; and <br /> • groundwater monitoring. <br /> Each of these activities is described below. <br /> Permitting <br /> GeoSyntec will obtain drilling and well installation permits from San Joaquin <br /> County. <br /> Health and Safety <br /> All field operations will be performed using the procedures and equipment outlined <br /> in the site-specific health and safety plan that will be updated to include this work. A <br /> \\WCREEK-0l\DATA\PRJI\WFS\SHELL\VER\HRC plans\RWQCB Plan.doc <br /> I� <br /> 0.1 REDYClEp AND RELYCI!ffiE <br />