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Addendum to Corrective Action Plan Page 8 • Former Manna Pro Site Project No 207 3 • August 12,2002 displace the water in the blank casing This will require about 15 to 18 psig at the surface To accomplish this, an additional compressor we needed ' 6 2.1 Carbon Unit Installation ' The report of the first phase remedial operations documented the relative leanness of the extracted vapors This lean vapor would appear to make use of a thermal oxidizer cost- ineffective as a means to destroy the evolved gasoline-laden vapors We suggest that the most cost-effective method of treating the evolved gasoline vapors is to use a large activated carbon-unit system A single 12,000-pound carbon filter will be installed to as the main vapor treatment device A smaller, 2,000-pound activated carbon filtration unit will be installed down-stream of the large unit and will be intended as a "polish" unit to remove and residual gasoline that may escape the main unit prior to discharge to the atmosphere As the project proceeds, it is expected that the rate at which gasoline is ' removed will be reduced At some point it may become appropriate to replace the 12,000-pound carbon filter with a smaller unit ' 4.1.4 Conveyance Piping & Manifold Installation � . Conveyance piping will be installed in trenches to protect it from traffic with the idea that it will be connected to the treatment equipment and eventually incorporated into a larger remedial manifold system Trenches will be back filled with road base and compacted Upon completion of compaction work, each trench will be capped with asphalt Vapor extraction and air sparge conveyance piping will be installed to connect each sparge well and extraction well to manifolds in the central treatment system compound Vapor extraction and air sparge well manifolds will be constructed to allow modification of airflow and extraction from the different remedial wells The vapor extraction manifold will include a mechanism that will allow sample collection and use of the well for passive I air recharge Rotameters and magnahelic gauges will be installed "in line" on both the air sparge and vapor extraction well manifolds to measure airflow and pressure/vacuum Diagrams of the remedial system and manifolds are attached as Figures 3 and 4 At the I conclusion of the project, the entire area will be re-paved with the type and quality of asphalt originally used by the owner of the Property 4.2 Remedial System Operation Once started, the system we be operated continuously until the rate of gasoline recovery becomes fall below 1 pound per day The sparge well will be operated continuously except for system repairs and servicing The vapor extraction wells will be cycled as described above ■ 2937 Veneman Ave,#B240 Geo-Phase Environmental Inc Phone(209) 569-0293 Modesto, CA 95356 Fax(209) 569-0295