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GIRD Jeff Granberry , • September 26, 1995 ( 9447-8620) December 8. 1994 an estimated 700 gallons of separate phase petroleum hydrocarbons (SPH) were removed by vacuum truck An additional total of an estimated 122 gallons of SPH was removed by vacuum truck on December 10, 11, and 13, 1995 The cumulative total of product removed by vacuum truck is estimated to be 822 gallons December 10 and 13, 1994 a representative of Fugro was on site to supervise the installation of Well MW-1 (Figure 2) The well was installed approximately one foot south of the UST basin and ancillary piping to determine whether petroleum hydrocarbons had migrated from the basin On December 13, 1994, RW-1 was installed at the eastern margin of the UST basin at a slight angle to the west in order to penetrate the UST basin Approximately 2 5 and 1 5 feet, respectively, of SPH were measured after well completion The laboratory report and chain of custody of soil samples collected from Well MW-1 are included in Appendix C and are summarized in Table 2. The soil boring log and well completion details are included in Appendix D December 13, 1994 a soil VES, consisting of an internal combustion engine (YC engine), began operation and was shut off on May 1, 1995 The system was operated for a total of 2,631 hours during this period, on a 24-hour basis for most of the time Notable exceptions are when the system was off for the days from December 18 to the 24, 1994, and when the system was operated only intermittently for the days from January 27 to February 8, 1995 Approximately 1,449 gallons of petroleum hydrocarbons were removed using the VES December 28 and 29-1994 further subsurface investigation was performed in the vicinity of the site to determine the areal extent of impacted ground water A cone penetrometer (CPT) rig was employed to advance 14 probes into the ground water for sample collection A total of fourteen ground water samples were collected seven on site and seven off site Additionally, five soil samples were collected from CPT1S-14 5, CPT2S- 14 5, CPT3S-14 5, CPT5S-14 5, and CPT5S-14 5 Laboratory analytical reports of soil and ground water samples are included in Appendix C and are summarized in Tables 2 and 3, respectively Figure 3 is a distribution map of benzene in ground water The CPT probe can be used to indicate stratigraphy and pore pressure based on pressure (called cone bearing on a CPT log) and friction (sleeve friction on CPT log) measurements at the probe tip During this investigation seven such tests were performed Data was collected from CPT-1, CPT-2, CPT-3, CPT-4, CPT-6, CPT-8, and CPT-11 (Figure 2) The CPT logs are included in Appendix D In addition, on December 28, 1994, three temporary piezometers were installed in CPT-1, CPT-4, and CPT-6 The depth to water was measured in the piezometers and the top of each was surveyed to a reference point Using this data, the hydraulic gradient was estimated to the north northeast i 94478620 ARP - 5 -