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Ms Laurie Cotulla <br /> April 29, 1992 <br /> Page 9 <br /> 2. Thermal Oxidation Thermal oxidation requires supplemental propane or natural gas <br /> ARCO's Health and Safety policy discourages the use of a propane tank at ARCO <br /> stations In addition, the use of propane or other supplemental fuel would result in high <br /> operatmg cost compared with catalytic oxidation. <br /> 3. Catalytic Oxidation Catalytic oxidation would be a cost-effective treatment method <br /> for the extracted vapors A 100 cubic-feet-per-minute (cfm) catalytic oxidizer will be <br /> capable of oxidizing approximately 110 pounds of hydrocarbons per day [3,000 parts <br /> per million (ppm) at 100 cam] at a low average operating cost The power consumption <br /> is typically low at the start of vapor extraction when hydrocarbon concentrations are <br /> relatively high, then increases over time as the hydrocarbon concentrations in the soil <br /> are reduced Should a system failure occur, BCC personnel would be notified by an <br /> autodial or other similar telemetry system <br /> The soil vapor treatment system will be located adjacent to the existing groundwater extraction <br /> system The proposed locations of the vapor extraction wells and piping is presented on <br /> Figure 3 The actual locations of the vapor extraction wells and piping will be determined by <br /> a number of factors including field conditions (existing underground piping etc ) The vapor <br /> extraction piping will be buried at an approximate depth of 3 feet bgs The depth of the vapor <br /> extraction wells will be determined in the field during drilling and will be based on the depth to <br /> groundwater and lithology <br /> Currently, a groundwater extraction system is in place and operational at this site The <br /> implementation of the soil vapor extraction system will reduce hydrocarbon concentrations in the <br /> soil as well as the groundwater <br /> If you have any questions about this addendum, please contact me at (916) 444-0123 <br /> Sincerely, <br /> BRO AND CALDWELL CONSULTANTS <br /> t <br /> Steven D Misner wreFli � P` s <br /> X* <br /> Project Manager Ca�ifoirimg�� Geologist#3710 <br /> SDM.jrb <br /> 4F CpUFO�`�i`� <br /> cc. Mr Chuck Carmel, ARCO Products Company <br /> Mr Chris Wmsor, ARCO Products Company <br /> Ms Elizabeth Thayer, Regional Water Quality Control Board, Central Valley Region <br /> Mr Frank Tucker, City of Stockton <br /> Stockton Public Library <br /> Rmwn and Caldwell 67474tFsP0RTS\6747-04.LTR <br /> Consultants <br />