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1117 Lone Palm Ave,Suite 201 <br /> Modesto,CA 95351 <br /> LWC <br /> Phone:209-579-2221 <br /> Fax: 209-579-2225 <br /> 3.2.2 Ozone Sparging <br /> Ozone sparging is an in-situ saturated zone remediation technology which involves the process <br /> of applying a mixture of ozone and atmospheric air into the saturated zone. The sparging <br /> component is essentially in-situ air stripping, in which bubbles containing air and ozone are <br /> injected into the subsurface and percolated upward through the saturated zone. As the air/ozone <br /> bubbles come into contact with groundwater contaminated with VOCs, the VOCs become <br /> entrained in the bubbles and are oxidized upon contact with ozone. Ozone is a strong oxidant <br /> and the end products of the oxidation reaction with petroleum hydrocarbon constituents include <br /> chloride, water, and carbon dioxide. This technology is primarily aimed at the TP Hg and BTEX <br /> components of groundwater contamination, as 1,2-DCA is not particularly susceptible to <br /> oxidation reactions. <br /> In order to determine the effectiveness of ozone sparging, an ozone sparging pilot test would <br /> need to be conducted at the site. Data collected during the ozone sparging pilot test would be <br /> utilized to evaluate the feasibility of this technology to remediate groundwater, as well as <br /> provide information to properly design a full-scale ozone sparging remediation system. •In order <br /> to conduct the ozone sparging pilot test at least three ozone sparging wells would need to be <br /> installed. The ozone sparging wells would be screened within the water bearing zone from 50 to <br /> 60 feet bgs. <br /> r 4.0 REMEDIATION ALTERNATIVES EVALUATION <br /> L• <br /> This section evaluates soil and groundwater alternatives based on effectiveness,technical feasibility, <br /> site logistics, and cost. The objective of remediation is to reduce site contaminant concentrations in <br /> rsoil and groundwater to acceptable levels and to prevent further migration of contaminants. <br /> Lr ATC selected groundwater extraction with aboveground biological nutrient augmentation and <br /> rreinjection in the vadose and water saturated zones. This technology was evaluated according to the <br /> 4• following criteria: <br /> 1. Level of protection of human health and the environment; <br /> 2. Reduction of toxicity,mobility and volume of contaminants; j <br /> 3. Compliance with regulatory guidelines; <br /> 4. Cost effectiveness/public benefit; <br /> 5. Short and longterm effectiveness; <br /> 6. Implementation,regulatory and community acceptance. _ <br /> I <br /> r- <br /> Ls:\environmental\22493\rcports\fcasibility.doc 10 <br />