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w <br /> E <br /> 30 January 2014 <br /> AGE Project No. 99-0682 <br /> Page 21 of 28 <br /> cost effective for relative ) small sites with few monitoring g points. For this site , the plume <br /> has migrated away from the site and remedial action is still necessary at the site , based <br /> on plume concentration and lateral distribution . <br /> 12. 0. RECOMMENDATIONS <br /> Based upon petroleum hydrocarbon distribution patterns and migration pathways identified <br /> in the site conceptual model , AGE has the below referenced recommendations for <br /> remediation of remaining "drowned " soil impact and impacted groundwater. <br /> In the above referenced CAP , AGE evaluated DPE , groundwater extraction (i . e . pump-and- <br /> treat) and ISCO to remediate the remaining hydrocarbon-impacted soil and groundwater <br /> at the Stallworth Auto Sales site . <br /> In evaluating the remaining "drowned" adsorbed hydrocarbon impact and dissolved impact <br /> to groundwater, AGE determined that DPE and groundwater extraction ('pump and treat") <br /> had low to moderate feasibility. Both technologies were discounted based on the need to <br /> treat "drowned" impact and due to the cost of installation and operation of the fixed <br /> systems. <br /> Following evaluation of all the above adsorbed and dissolved mitigative techniques, AGE <br /> cQ has concluded that ISCO has the greatest feasibility to effectively remediate <br /> hydrocarbon-impacted "drowned " soil (between 25 and 70 feet bsg ) and groundwater at <br /> p ,o� the site. ISCO was selected based successful pilot testing conducted at the site and due <br /> CP yS� to its ability to treat both the highly impacted core area of the shallow and intermediate <br /> Y <br /> .( V plumes and to "strip" and treat residual impact to "drowned" soils . <br /> Based on these findings and evaluations , a final remedial action work plan has been <br /> prepared and is included below. <br /> 13 .0 FINAL REMEDIATION PLAN <br /> Based on the above evaluation of remedial technologies , it is AGE's opinion that the best <br /> available technology to remediate residual hydrocarbon impact to "drowned" soil and <br /> why groundwater aLthe_sLe is the application of a peroxide solution over a larger area of the <br /> q 11 site plume. <br /> � VIOP. <br /> For the corrective action , AGE proposes utilizing existing wells at the site and proposes the <br /> installation of additional shallowand intermediate injection wellsto aid in the lateral delivery <br /> tett of the product to the subsurface . The final remediation plan ( FRP) below details the <br /> Advanced GeoEnvironmental, Inc. <br /> W <br />