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� AMBRIq f <br /> during late 1991 and early igmf1 Not all the data from this testing is available. However, the <br /> SVE was feasible and effective.available data suggest that si ific <br /> ve,ant <br /> Geo-2 (hydrocarbon mass was present in this source <br /> (May 2000)confirm that petroleum h Subsequent boringsarea and that <br /> September 1995) and SB-5 <br /> levels remain. hydrocarbons in this source area were reduced, <br /> but moderate <br /> Since groundwater monitoring was initiated in July 1990, the groundwater table has <br /> approximately 20 feet. Groundwater analytical results from well VEW-2 indicate moderately high levels of petroleum hydrocarbons risen <br /> ate that <br /> SVE appears to be feasible and effective from are Present in the former UST area. Since <br /> © extraction (DPE)as interim re Prior testing, Cambria has proposed dual-phase <br /> mediation of the residual contamination in this source area. DPE <br /> is required to dewater the current saturated zone and expose impacted soils in the 35 to 50 fbg <br /> range to SVE. <br /> WORK TASKS FOR INTERIM REMEDIATION <br /> DPE involves applying a vacuum to a well to dewater the formation to a target elevation and <br /> extract hydrocarbon-bearing vapors from the dewatered zone. A dedicated extraction "stinger" <br /> installed through an airtight well sea] allows DPE at target elevations. Alternatively, a <br /> submersible groundwater pump may be used if it is deemed more efficient in dewatering the <br /> formation. <br /> As discussed in Cambria's October 3, 2003 Site Conceptual ModellSite Investigation Work Plan, <br /> Cambria will target existing well VEW-2 for DPE. Once the well has been dewatered to the <br /> target elevation (approximately 45 fbg), Cambria will incrementally increase the applied vacuum <br /> setting to determine the optimal extraction rate (maximum air flow rate). Once determined, <br /> Cambria will set DPE operation at the optimal extraction rate. Cambria anticipates conducting <br /> DPE from well VEW-2 for at least three continuous days. <br /> Upon completion of DPE from well VEW-2,the equipment will be set to conduct SVE from well <br /> VEW-1. Dewatering of this well is not required. As with DPE, Cambria will incrementally <br /> increase the applied vacuum setting to determine the optimal extraction rate. Once determined, <br /> Cambria will set SVE operation at the optimal extraction rate. Cambria anticipates conducting <br /> SVE from well VEW-1 up to two continuous days. The duration of DPE on well VEW-2 or SVE <br /> on well VEW-1 may alter depending on the data produced. <br /> R54 2 <br />