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The radius of influence generated during the aquifer pump test performed on groundwater extraction well EX -1 can be calculated from the field data collected during the pump test Based on the quality of the collected data, and comparison with typical transmissivities, the design transmissivity specific to the site was established as the mean transmissivity of SVE-2, SVE-3, and MW -12 of 0 1354 ft2/min Different radii of influence specific to down gradient capture zones and cross -gradient capture zones can be determined based of the pumping well volume rate (Q), transmissivity (T), and groundwater gradient (i) The down gradient capture zone radius of influence (Ddown), defined as Dd.,, =Q/(2*Pi*T*1), is calculated to be 314 feet, Based on observed aquifer test characteristics of Q=2 0 gallon per minute (gpm), T=0 1354 ft2/mm, and a mean gradient of 1=0 001 feet per foot (ft/ft) The cross -gradient capture zone radius of influence (Dross), defined as Dc,,,S Q/(T*i), is calculated to be 1,970 feet, Based on Q=2 0 gpm, T=0 1354 ft2/inin, and 1=0 001 ft/ft lr�-ad,&t on to r'os`;i}11vCC1rt1.,1' ?,-v1"; ai--,IV-(I - i`jJI' or'lit)0.1 i- `ro'.-rtti,-1f-rT"Ida,t','yii11 F 1, the established capture zones, groundwater extraction could effectively expose additional hydrocarbon - impacted soil that is occluded by higher groundwater levels from vapor extraction remedial treatment Based on the data presented in the previous table, exponential and natural logarithmic least square fit equations of y=9 0298e-) 1194i and y=-2 4551ln(x)+8 0697, respectively, describe the observed draw down profiles with x as the draw down in feet and y being the radial distance from groundwater extraction well EX -1 in feet The values of the calculated hydraulic conductivity and groundwater yield suggest that the use of conventional groundwater gravity wells, or dual phase vapor and groundwater extraction, may be an acceptable means of extracting groundwater to control plume migration or to expose hydrocarbon - impacted soil 9 0 REMEDIAL FEASIBILITY TESTING FINDINGS AND RECOMMENDATIONS Based on field observations, review of historic documents, and laboratory analytical results collected during the remedial feasibility studies conducted at the site, ATC believes that the hydrocarbon impacted soil and groundwater can be remediated in-situ at the site The vapor extraction feasibility study indicates vapor extraction technology could be successful in remediating hydrocarbon -impacted soil onsite The aquifer test indicated that combining groundwater extraction with vapor extraction could extend the capabilities of a vapor extraction system Additionally, combining air sparge technology with the dual phase extraction technology may effectively remediate the dissolved phase hydrocarbon plume EZ 100966 CAP S \EZ Sme\FZ 1009661Reports1100966CAP 17 ATC Associates Inc ATC Prosect No 43 25827 0026