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' TABLE 7 <br /> HISTORICAL GROUNDWATER FLOW DIRECTIONS & GRADIENTS <br /> Mid-Cal Leasing <br /> 1649 East Channel Street, Stockton, California <br /> Date Calculated Flow Calculated Gradient <br />' Direction (ft/ft) <br /> 3-17-93 S 7° W 00073 <br />' 6-28-93 S 70° E 00025 <br /> 10-18-93 S 720 E 00050 <br /> 1-14-94 Due East 00003 <br />' 4-15-94 N 570 W 00004 <br /> 8-17-94 S 71° E 00048 <br />' 8-24-94 S 640 E 00048 <br /> 8-31-94 S 64° E 00053 <br /> 9-7-94 S 65° E 00058 <br /> I <br /> 3.4.6 Purge Water Disposition <br /> Purge water from monitoring wells at the Site was stored in 55-gallon DOT drums Purge <br /> water from the March and June 1993 monitoring events was disposed on-site The purge <br /> water was placed on the stockpiled soil This soil was then disposed at a licensed landfill <br /> facility (see Section 3 5 4) Since purge water from all subsequent monitoring events was <br /> uncontaminated, the containerized water was discharged on-site <br /> 3.5 Excavation Activities <br /> Hydrocarbon impacted soil was excavated from the UST site in two phases because of space <br /> limitations and equipment capabilities The first phase of excavation was performed on <br /> August 30 and 31, 1993 The second phase of excavation was performed on September 21, <br /> i1993 After each phase of digging, soil samples were collected from the floor and sidewalls <br /> of the excavation The excavator and operator were provided by Ned Pepper, Inc of <br /> Folsom Full documentation of the excavation activities is presented in the Preliminary <br /> Investigation and Evaluation Report (PIER), dated April 5, 1993, prepared by GeoAudit <br /> During both phases of excavation, a total of 15 samples were collected from the sidewalls <br /> and floor of the excavation All samples were collected at the direction of Ms Mary Meays <br /> of the PHS/EHD As the excavation proceeded, the soil was screened for the presence of <br /> organic vapors using a photo-ionization detector (PID Thermo Environmental 580A, 10 0 <br /> eV, calibrated to isobutylene) and segregated into contaminated and clean stockpiles <br /> Analytical results of soil samples collected during excavation activities are presented in Table <br /> 8 <br /> awr.aoo n.ai S-­k I.e O <br /> Md GI;1--.d CSX4 6LAO. 8 <br />