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'ate <br /> 7-Eleven/Stockton 10 <br /> May 1990 <br /> is supported by the sharp permeability contrast which exists at <br /> the base of the gravelly coarse sand and the marked attenuation <br /> of the lateral extent of the dissolved-hydrocarbon plume <br /> coincident with the decline of the groundwater elevation below <br /> the base of the gravelly coarse sand. <br /> SCOPE OF WORK <br /> Services performed by Groundwater Technology during this <br /> - reporting period consisted primarily of additional monitoring- <br /> well installation, regularly scheduled operation and maintenance <br /> of the groundwater treatment system, and monitoring and sampling <br /> of the groundwater monitoring wells. Specifically, the following <br /> services have been conducted since the previous reporting period <br /> deadline of December 31, 1989: <br /> o Drilled three on-site soil borings and installed three <br /> 2-inch--diameter monitoring wells to varying depths to <br /> construct. an on-site monitoring-well cluster (MW-17) . <br /> .ti. o Monitored on-site and off-site wells for depth-to- <br /> water and depth-to-product on four separate occasions. <br /> is <br /> o Sampled groundwater from thirteen monitoring wells, two <br /> monitoring-well clusters, one recovery well, and ten <br /> nearby domestic wells for laboratory analyses. <br /> o Maintained the groundwater treatment system, including <br /> sampling and analyses of the groundwater-treatment <br /> -- system influent and effluent. <br /> o All wellheads were upgraded with water-tight expansion <br /> �-J caps and new locks, and professionally surveyed. Table <br /> 1 summarizes the well data and status. <br /> - r GRoc,n,VATER <br /> T}cH\ol.oG};INC. <br />