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s{ <br /> f <br /> a <br /> 5.2.3 Discussion Strengths and Weaknesses of Method <br /> Traditional excavation has the advantage of! being a rapid complete removal of <br /> contamination. This would allow rapid closure ofIthe site. Unfortunately the proximity of <br /> a building would require shoring to protect the integrity of the sides of the excavation. The <br /> cost of shoring is significant. Cost estimates for tr!arlitional excavation range in and around <br /> f $50,000. I <br /> h <br /> . If <br /> �i <br /> 5.3 Bioremediation <br /> } <br /> 5.3.1 Background Jil <br /> 'i <br /> A biological enhancing, soil oxygenating material, produced by marine microorganisms is <br /> available. This material is manufactured by Alpha E vironmental, Inc and vended in <br /> California by Diamond Environmental Services,Ltd. The.materii l is known as"Alpha Bio- <br /> Catalyst". To treat hydrocarbons,the bio-catalyst is"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 /> a <br /> Should the project warrant a greater supply of oxygen we would entertain the possibility of <br /> bioventing. Air would be supplied to the treatmentrone in a limited quantity to preclude the <br /> possibility of causing air sparging. <br /> 5.3.2 Discussion of Application <br /> i <br /> j The general morphology of the specific site serves to provide interesting potential for <br /> treatment with in-situ bioremediation. When the original excavation of the 1000 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. i <br /> E <br /> i <br /> l <br /> Page 6 <br />