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CLEARWATER <br />' G R O U P <br /> Environmental Services <br /> 1 <br /> 6.5 Infection Well Installation <br />' For proper deployment, 1SOC requires a network of infection wells (2 inches 1n diameter or <br /> larger) located 20 to 30 feet apart The SJC/EHD has requested that iSOC components not be <br /> deployed within any of the existing monitoring wells, and that new infection wells be installed to <br /> facilitate the system installation The infection wells will be drilled and constructed so that they <br />' are similar to the on-site monitoring wells (1 e , 20 to 25 feet deep with top of screen at 5 feet <br /> deep) Important well construction considerations will include drilling to sufficient depth to <br />' assure that the wells will not dry-out during the summer months, and providing adequate screen <br /> length to prevent occlusion of the well screen during periods of high water <br /> I <br /> Clearwater proposes to install up to twelve infection wells along the easterly property line and <br /> within the site boundaries A portion of the groundwater contaminant plume is indicated by past <br /> monitoring results to be located under the right-of-way of South Fresno Avenue However, the <br /> City of Stockton does not permit installations of wells within its roadways, therefore, that portion <br />' of the groundwater contaminant plume will not be directly accessible via infection wells <br /> However, dissolved oxygen from the iSOC infusers, and infected liquid nutrients would be <br />' anticipated to affect that portion of the groundwater contaminant plume located under South <br /> Fresno Avenue via diffusion, dispersion, and groundwater flow dynamics South Fresno Avenue <br />' is located hydrologically down-gradient from the core of the groundwater contaminant plume It <br /> is Clearwater's opinion that the iSOC oxygen-infusion, and nutrient infections would have a <br />' reasonable likelihood to arrive at portions of the groundwater contaminant plume located down- <br /> gradient from the site Based on known site conditions and geology, Clearwater anticipates that <br />' it may be feasible to install the infection wells (up to 25 feet deep) within three work-days The <br /> wells will be developed by bailing, surging, and pumping in accordance with standard well <br />' development procedures Well development water will be stored on the site in appropriate <br /> • labeled drums pending characterization for off-site treatment/recycling at a licensed facility <br /> ZB178C RAP 21 May 18,2004 <br />