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7-Eleven/Stockton e <br /> November 1989 <br /> - o Developed and sampled the newly-installed monitoring <br /> well cluster and monitoring well. <br /> MONITORING WELL INSTALIATION <br /> During this reporting period, one monitoring well cluster <br /> and one individual monitoring well were installed. All work <br /> __, steps were conducted in accordance with the California Regional <br /> Water Quality Control Board (RWQCB) and San Joaquin County Local <br /> - Health District (SJCLHD) regulations. <br /> During the week of August 7 - 11, 1989, a three-well monitoring <br /> well cluster (MVI-15, A, B, C) was installed in the location shown <br /> on the Site Plan (Figure 2) . The well-cluster location was <br /> selected to further define the horizontal and vertical extent of <br /> dissolved hydrocarbons in the downgradient direction. Boreholes <br /> were drilled using a truck-mounted 8-1/4-inch-diameter, hollow- <br /> stem auger drill rig following GP'I's Standard Operating <br /> Procedures (SOPS) (Appendix B) . Continuous cares were collected <br /> ti to obtain an accurate subsurface profile and to determine <br /> completion depths for each well of the cluster. <br /> The initial boring in the well cluster was drilled to a <br /> depth of 75-feet. Based on -field observation of the continuous <br /> .. core, the total depth and screened intervals for each well in the <br /> well cluster was determined. The second boring was drilled to a <br /> depth of 69--feet and the third boring drilled to a depth of 62- <br /> feet. <br /> During drilling, soil samples were collected by a GTI <br /> geologist at 5-foot depth intervals. samples were obtained by <br /> driving a split-spoon sampler, lined with three, 2-inch-diameter <br /> by 6-inch-long brass tubes into the undisturbed soil at the <br /> J GHI.�Utt1TF:R <br /> Ti:oi\o ii i ns.Int <br />