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' 20 March 2015 <br /> AGE Project No. 00-0769 <br /> ' Page 19 of 19 <br /> ' • TPH-g, BTEX, 1,2 DCA, and TAME were reported in every hydrogeologic unit <br /> sampled (HU-1 through HU-5: Figures 7-11). <br /> • The lateral and vertical extent of petroleum hydrocarbon-impacted groundwater <br /> remains somewhat undefined; however the dissolved plume has been <br /> adequately assessed. The volume of the dissolved plume has been documented <br /> ' with grab groundwater samples and monitoring well samples. <br /> ' 7.0. RECOMMENDATIONS <br /> Based on the results of the ozone injection pilot test, AGE recommends performing a <br /> ' second, short-term, liquid-based ISCO pilot test utilizing hydrogen peroxide to inject into <br /> selected HU1 and HU2 wells, at the site. If favorable results are obtained from the pilot <br /> test, AGE recommends preparation of a remedial action work plan (RAWP) proposing <br /> ' ISCO remediation consisting of a combination of ozone and hydrogen peroxide <br /> injections. <br /> ' Additionally, AGE recommends continuation of the semi-annual groundwater monitoring <br /> and reporting program; the next semi-annual groundwater monitoring is scheduled for <br /> March 2015; results of the semi-annual event should be evaluated and submitted to the <br /> EHD prior to preparing the RAWP. <br /> ' 8.0. LIMITATIONS <br /> Our professional services were performed using that degree of care and skill ordinarily <br /> ' exercised by environmental consultants practicing in this or similar localities. Findings <br /> were based upon field measurements and analytical results provided by an independent <br /> laboratory. Evaluation of the hydrogeologic conditions at the site for the purpose of this <br /> ' investigation are made from a limited number of available data points (i.e. field data and <br /> groundwater samples), and subsurface conditions may vary away from these data <br /> points. No other warranty, expressed or implied, is made as to the professional <br /> ' interpretations, opinions, and recommendations contained in this report. <br /> 1 <br /> Advanced GeoGnvironmental Inc. <br />