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t <br /> Ile 24 September 2001 <br /> AGE-NC Project No 95-0109 <br /> I; Page 2 of 9 <br />' full-scale Inoculation with hydrocarbon-consuming bacteria Details of well inoculation can be found <br /> iri the GeoAudrt-prepared Quarterly Report-September 1994, dated 18 October 1994 <br /> In May and September 1998 and January 1999 hydrogen peroxide was added to selected wells to <br /> Increase dissolved oxygen concentrations and promote biodegradation The most recent soil borings <br /> were advanced in February 1999, to assess the progress of the in-situ bioremediation Results of the <br />' investigation Indicated that 90% of the hydrocarbons impacting soil had been remediated A <br /> summary of in-situ bioremediation can be found In the AGE-prepared Quarterly Report-March <br />' and June 1999 dated 11 August 1999 <br /> y, Further background Information Including the site history, description and results of previous <br /> Investigations are detailed in the Problem Assessment Report(PAR) dated 31 July 1991, prepared r <br />' by PES Environmental,Inc ,and in the AGE-prepared reports Quarterly Report-March 1996 dated <br /> 19 April 1996 and Quarterly Report-March and June 1999 dated 11,August 1999 <br />' The vertical and lateral extent of hydrocarbon-impacted soil has been delineated on the site During <br /> the March and June 2001 sampling events 1,2-dichloroethane(1,2-DCA)was detected in the water <br />' samples collected from the furthest down-gradient well, MW-12, Indicating that Impacted ground <br /> water has migrated beyond the current monitoring well network In accordance with C&A Order No <br /> 93-701 this work plan includes the Installation of a down-gradient monitoring well to define the <br />' lateral extent of impacted ground water Additionally,C&A Order No 93-701 states that the vertical <br /> extent of impacted ground water must be defined, therefore this work plan also includes the <br /> advancement of deep CPT soil borings to assess the vertical extent of impacted ground water <br />' Historical ground water data is presented in Tables 1 through 4 Maps depicting the approximate <br /> extent of TPH-g-, benzene- and 1,2-DCA-Impacted ground water are presented in Figures 3, 4 and <br /> 5 <br /> I s <br /> 3.0. SCOPE OF WORK <br /> 1 <br /> In order to assess the lateral and vertical extent of impacted ground water one ground water <br />' monitoring well will be installed off-site and four CPT soil borings will be advanced on the site The <br /> assessment activities will consist of the following tasks <br /> • Permitting and pre-field work preparations, <br />' CPT soil boring advancement, <br /> • Ground water sample collection and analysis, <br /> • • Monitonng well installation and sampling, and <br /> • Report preparation <br /> Advanced GeoEnvironmeotal,Inc <br />