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03 November 2003 AGE-NC Project No 95-0173 Page 2 of 2 Therefore, based on the decreasing SVE hydrocarbon concentrations (less than 1,000 µg/1) and elevated electrical utility costs,AGE proposes to replace the current catalytic oxidizer SVE unit with a more energy efficient, carbon-based canister system A diagram depicting the general lay-out of the carbon-canister system is depicted in Figure 3 The carbon-based canister system will comprise ofone 4%2-horsepower, regenerative vacuum blower and two-1,000 pound carbon canisters Based on influent vacuum measurements that have generally been observed at the site between 30 and 40 inches of water,AGE anticipates the influent air flow stream to be approximately 125-150 standard cubic feet per minute (scfin) utilizing the above 4%2-horsepower vacuum blower This modification to the remediation system will allow for the recovery and destruction of hydrocarbon vapors within the existing vadose zone at a much lower energy cost than that of the present catalytic oxidizer SVE unit Based on AGE's experience with similar vacuum blower and carbon canister systems, AGE anticipates the cost of monthly electric usage to be between approximately $300 00 and $500 00, and should significantly lower electrical expenditures by approximately$1,500 00 per month Additionally,based on SVE hydrocarbon vapor concentrations at 200 µg/1 and air flow vapor stream at approximately 125 scfrn, AGE anticipates a carbon exhaust rate at or around 5 lbs /day, or approximately 400 days of carbon usage Progress and operation of the vacuum blower and two carbon canisters will be evaluated on a quarterly basis If you should have any questions or require further information, please contact our office at (209) 467-1006 Sincerely, Advanced GeoEnvironmental, Inc. Timothy J u 1 Project Geologist Enclosures cc Mr David Atwater, Van De Pol Enterprises Inc Advanced GeoEnvironmental,Inc