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11 March 2014 <br />AGE Project No. 96-0236 <br />Page 25 of 32 <br />11.0. RECOMMENDATIONS <br />Based upon petroleum hydrocarbon distribution patterns and migration pathways <br />identified in the site conceptual model, AGE provides the following summary and <br />recommendations for remediation of remaining "drowned" soil impact and impacted <br />groundwater: <br />In the above referenced CAP, AGE evaluated DPE, groundwater extraction (i.e. pump- <br />and-treat), ozone injection and ISCO to remediate the remaining hydrocarbon-impacted <br />soil and groundwater at the Boulevard Automotive Service site. <br />In evaluating the remaining "drowned" adsorbed hydrocarbon impact and dissolved <br />impact to groundwater, AGE determined that DPE and groundwater extraction (pump <br />and treat") had low to moderate feasibility. Both technologies were discounted based on <br />the need to treat "drowned" impact and due to the cost of installation and operation of <br />the fixed systems. <br />AGE further evaluated two ISCO techniques typically used to remediate soils and <br />groundwater, which included ozone injection and hydrogen peroxide injection. Based on <br />evaluation of ozone injection, AGE concluded that the technology had a moderate <br />feasibility to remediate the remaining impact at the site. However, based on the need to <br />install a fixed system, a large network of wells with several discrete screening intervals <br />and subterranean piping networks, ozone injection was discounted as a remedial option <br />for the site. <br />Following evaluation of all the above adsorbed and dissolved mitigative techniques, <br />AGE has concluded that ISCO, via diluted hydrogen peroxide injection, has the <br />greatest feasibility to effectively remediate and reduced concentrations of hydrocarbons <br />"drowned" in soil and dissolved in groundwater at the site. ISCO was selected based <br />successful pilot testing conducted at the site and due to its ability to treat both the highly <br />impacted core area of the shallow and intermediate plumes and to "strip" and treat <br />residual impact to "drowned" soils. Further, a fixed system and subsurface infrastructure <br />can be avoided utilizing this technology. <br />Based on these findings and evaluations, a final remedial action work plan has been <br />prepared and is included below. <br />12.0 FINAL REMEDIATION PLAN <br />Based on the above evaluation of remedial technologies, it is AGE's opinion that the <br />best available technology to remediate residual hydrocarbon impact to "drowned" soil <br />and groundwater at the site, is the application of a diluted solution of peroxide over a <br />larger area of the site plumes. <br />Advanced GeoEnvironmental, Inc.