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3.2.3 Bioremediation <br /> Background <br /> A biological enhancing, soil oxygenating material, produced by marine microorganisms i$ <br /> available. This`material is manufactured by Alpha Environmental, Inc and vended in <br /> California by Diamond Environmental Services,Ltd. The material is known as"Alpha Bio- <br /> Catalyst". To treat hydrocarbons,the bio-catalyst is mixed with hydrocarbon feeding bacteria <br /> and basic nutrients,(nitrogen and phosphorous). The mixture,call it the treatment solution, <br /> is applied as an aqueous solution. Generally measurable reduction of the hydrocarbon can <br /> be measured within thirty days of application. Copies of the Material Safety Data Sheet and <br /> other technical information is included in the Appendix. <br /> I <br /> Should the project warrant a greater supply of oxygen we would entertain the possibility of <br /> bioventing. Air would be supplied to the treatment zone in a limited quantity to.preclude the <br /> possibility of causing air spargirL& <br /> Proposal <br /> Should the soil sampling suggest that: <br /> 1. Excavation is financially impractical <br /> 2. The contamination has migrated close to or under the adjacent building,such that <br /> excavation is not possible without risk to the structure. <br /> i 3. Other factors which favor bioremediation are identified. <br /> And in-situ bioremediation can be accomplished in a cost effective manner. The following <br /> F , <br /> is proposed <br /> ' The general morphology of the spedfic site serves to provide interesting potential for <br /> treatment with in-situ bioremediation. When the original excavation of the 1040 gallon tank <br /> was performed a significant portion of the back-fill was pea gravel The pea gravel mass has <br /> ' open space because of its uniform size and shape. The open space could be used as a <br /> charging area for the treatment media. If the contamination has not migrated a great <br /> distance,infiltration from the charged pea gravel mass could reach and inoculate the zone of <br /> ' contamination. <br /> i <br /> I <br /> I <br /> i <br /> Page 4 <br />