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' • 0 r File No. 249947 20 May 1991 Page 6 ' Sand and grease traps. To investigate the soil conditions in the vicinity of the exposed sand traps, we attempted to excavate the traps, using a backhoe. ' 2.0 RESULTS OF INVESTIGATION ' 2.1 Site Conditions The field work was completed on 22 April 1991. Photographs of the results of this work are included as Appendix A of this report. ' Bus Building Anomalies. Two anomalies were noted in the geophysical survey, in the locations shown on Figure 3. For the purposes of this report, the southern anomoly, measuring approximately 8 by 21 feet shall be referred to as the 'large anomoly." The anomoly to the north, measuring approximately 4 by 10 feet, will be called the "small anomoly." The large and small anomalies were excavated using a John Deere Brand 310D rbackhoe. Both 12 and 18 inch buckets were used in the excavation work. Large anomaly. The larger anomaly was found to be a mechanic's pit. The pit, ' which was 4.5 feet deep, was constructed of eight inch thick walls of reinforced concrete (see photographs, Appendix A). A flight of concrete stairs was uncovered on the northern end of the pit. The pit was found to have been backfilled with soil ' and covered with a 4 inch layer of concrete. Some metal debris was found in the backfill material. The soil excavated from this area was notably more moist than soils from other portions of the site. This may be because the concrete floor of the ' pit did not allow for the drainage of water. A soil sample (S-1) was collected from the spoils excavated from this area. ' The mechanic's pit was narrower than the large anomoly noted in the geophysical study. The eastern edge of the pit was located approximately 2 feet west of the eastern edge of the large anomoly. This area was also excavated to a depth of 4.5 ' feet. No evidence of other buried items was encountered in the excavated soil from this area. A soil sample (S-2) was collected from the material excavated from this area. ' The mechanic's pit would have been located in the maintanence building, most likely near the building's center. Our information indicates that the tanks were ' located along the eastern edge of one of the two buildings. If the tanks were installed near the maintanence building, they would therefore have been located east of the large and small anamolies. That area was surveyed during the ' geophysical investigations; no evidence of tanks was uncovered. 1WDERSGN ' DDNSUL7ING GRDUP 0