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r _ l <br /> 6. 3 Contaminated Groundwater Remediation <br /> I GeoAudit recommends that in-situ bioremediation of groundwater be <br /> employed at the Geweke site to mitigate groundwater contamination. <br /> The cost, safety and encouraging results at other sites make in- <br /> situ bioremediation a very attractive method for groundwater <br /> treatment at this site. It can also be performed with little or no <br /> disruption to normal on-site activities. <br /> 6. 3 .1 Equipment and Design <br /> No additional wells will need to be installed for treatment of the <br /> groundwater. The groundwater monitoring wells presently associated <br /> with the site should be adequate for inoculation. <br /> 6.3 .2 Permitting <br /> All necessary city, county and state permits will be obtained from <br /> the applicable authorities . Given the indigenous nature of the <br /> bacteriological culture, not composing a waste or waste product, it <br /> is not anticipated that a waste discharge permit, as defined by the <br /> Porter-Cologne Water Quality Act, will be required. In this regard <br /> GLDM anticipates the issuance of a negative declaration related to <br /> the biological inoculation. <br /> 6. 3 .3 Groundwater Monitoring <br /> GeoAudit recommends that the off-site monitoring wells in the down- <br /> gradient direction (MW-8 , MW-9 , MW-11, MW--12 and MW-13) be <br /> monitored on a monthly basis during the first quarter after <br /> inoculation. The purpose of this monitoring is to ensure that the <br /> contamination plume has not migrated down-gradient ahead of the <br /> Ibacteria. <br /> Samples from these wells should be collected and analyzed for TPH <br /> as gas and BTE&X. The wells should also be monitored for pH to <br /> ensure that the carbon dioxide, a by-product of the bioremediation <br /> process, is not adversely affecting groundwater quality. <br /> t7. 0 SCHEDULE <br /> Groundwater depth at the site has fluctuated considerably since <br /> contamination was first encountered at the site in 1985. The depth <br /> to groundwater fell 15 to 25 feet in the area in the past 7 years. <br /> Recently, with the end of drought conditions, groundwater in the <br /> area has begun to rise. <br /> Because of the significant quantities of vadose zone contamination <br /> of the soil, the fluctuation in groundwater depth and permit <br /> acquisition times, GeoAudit proposes to initiate remedial <br /> activities at the site in two phases. The first phase, to begin <br /> I 12 <br />