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1117 Lone Palm Ave,Suite 201 <br /> Modesto,CA 95351 <br /> Phone:209-579-2221 <br /> (VYATCFax: 209-579-2225 <br /> BIO-REMEDIATION REFERENCES <br /> In the Feasibility Study, ATC recommended employing Enhanced Natural Attenuation for soil <br /> remediation and Groundwater Extraction with Biological Treatment and Bio-Enhanced Infiltration <br /> as the remediation option for groundwater at this site. In regulatory correspondence dated <br /> September 24, 2008, SJEHD requested a list of sites at which this form of bio-remediation has <br /> been used. While the specific engineering of this approach will likely be unique to the site, the <br /> material ATC had selected for use in this approach, a product called X-19 (www.x-19.com), has <br /> been employed twice previously by ATC in Merced County, once for ex-situ soil remediation and <br /> once for in-situ soil and (incidental) water remediation. Both cases are under the supervision of <br /> the Merced County Department of Environmental Health (the LOP for Merced County) and the <br /> Central Valley RWQCB. <br /> -ANDERSON'S PEA SOUP (T0604711623)— f-7<---1+k <br /> (Regulatory Lead: Eric Swenson, Merced County Environmental Health) <br /> -UNIVERSITY OF CALIFORNIA MERCED (SL0604722749) Ive, dam t%- f7+1,/ C^4,aoS-40 <br /> (Regulatory Lead: Warren Gross, Central Valley RWQCB) <br /> A bio-active trench filtration system employing X-19 was installed at a third site in Merced <br /> County. <br /> -MEZA BROTHERS, INC. (T0604700240) <br /> (Regulatory Lead: Eric Swenson, Merced County Environmental Health) <br /> While constructed as an in-aquifer filtration "fence" instead of a gravity-fed vertical infiltration <br /> gallery, the Meza Brothers site does employ the X-19 product to remediate groundwater. The <br /> bio-active trench remains in place and monitoring continues, according to publicly available <br /> reports. <br /> Another bio-trench and infiltration system incorporating X-19 was installed at a site in the <br /> Portland, Oregon area. <br /> -CASCADE CORPORATION (ECSI Site ID: 635; CERCLIS ID: 009031378 <br /> (Regulatory Lead: Kenneth A. Cameron or Mavis Kent, Oregon Department of <br /> Environmental Quality) <br /> As noted in ATC's Feasibility Study, success of biological augmentation is predicated on viable <br /> subsurface conditions and an ideal biological environment. Feasibility testing in association <br /> with technology specific sample collection and analyses are a critical aspect in the process. As <br /> discussed in the Feasibility Study, preliminary testing would involve conducting both an aquifer <br /> pumping test and several injection tests to evaluate the groundwater hydraulic properties. <br /> Additionally, technology specific soil and groundwater tests, which include geotechnical soil <br /> analyses, soil percolation tests, and heterotrophic plate count tests would be required to assure <br /> that the necessary site conditions are available. <br /> s:\environmental\-72493\reports\feasibility.doc 3 <br />