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- - Page 2 of 2 <br /> reconfiguration of the transformers. <br /> Due to the cost of the PG&E contract, AGE reviewed the site data and determined that a soil- <br /> vapor extraction system using a carbon-based remediation system would be more economically <br /> feasible for mitigating impacted soil and groundwater at the site. The current transformers and <br /> configuration of transformers at the site will be capable of handling the electrical load required to <br /> operate a carbon-based SVE unit in tandem with an in-situ air sparge system; this will greatly <br /> reduce the costs of the electrical service provide by PG&E . Additionally, the costs per month of <br /> operating a carbon based system will be far less than operational costs of an oxidizer. Due to the <br /> concentrations of contaminants at the site, multiple carbon change-outs may be necessary during <br /> the first 3-6 months of operation. However, the costs of replacing carbon are still far less than the <br /> cost of installing and operating an oxidizer SVE system at the site . <br /> Specifications of a carbon based SVE system will be similar to the oxidizer originally proposed for <br /> the site, with the exception of the destruction process. The carbon based system will utilize a <br /> vacuum blower (positive displacement) capable of 250 cubic feet per minute , a condensation <br /> separator (Knockout Vessel) , and three 1 , 000-pound vapor carbon vessels for contaminant <br /> destruction . <br /> With your approval, I would like to continue the electrical service installation and remediation <br /> installation at the site using a carbon based SVE system to operate concurrently with an in-situ <br /> air sparge system. <br /> Please don't hesitate to contact me with any questions or comments you have. <br /> Thanks, <br /> Brian W. Millman <br /> California Professional Geologist #8574 <br /> Advanced GeoEnvironmental , Inc. <br /> Stockton • Santa Rosa • Monterey • Brea • Spokane • Portland • Reno • Dallas <br /> 1 -800-511 -9300 <br /> bm i I ImanlcDadvgeoenv.com <br /> www.adneoenv. com <br /> This email/fax message is for the sole use of the intended recipient(s) and may contain confidential and privileged information. Any <br /> unauthorized review, use, disclosure or distribution of this email/fax is prohibited. If you are not the intended recipient, please contact <br /> the sender by email/fax and destroy all paper and electronic copies of the original message <br /> 4/2/2013 <br />