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'4we *.00' 12 February 1996 AGE-NC Project No.95-0106 Page 2 of 6 respectively. 2.3. EXCAVATION OF UST AREA In an attempt to remove remaining impacted soil, the former UST area was excavated in August 1995 Excavation procedures were supervised by representatives of AGE. Hydrocarbon-impacted soil was excavated to a depth of 8 feet. Approximate limits of the August 1995 excavation are indicated on Figure 2. Approximately 100 cubic yards of impacted soil was removed from the former UST area. No petroleum hydrocarbons were detected in soil samples collected from the floor of the excavation. Excavated soil was stockpiled adjacent to the excavation. 2.4. PRELIMINARY SITE INVESTIGATION On 20 December 1995, AGE advanced six soil probings at the site to investigate the lateral and vertical extent of hydrocarbon-impacted soil and ground water. Probing locations are illustrated in Figure 2. Soil samples collected from the probings indicated that hydrocarbon-impacted soil was limited to the capillary fringe and saturated zones at the site. TPH-g was detected in grab ground water samples at concentrations up to 210,000 ppb. Results of the initial investigation will be included in a quarterly report prepared after installation of the ground water monitoring wells. 2.5. GROUND WATER DEPTH AND GRADIENT Information obtained from nearby monitoring wells in Tracy indicate that ground water depth at the site is between 6 to 10 feet;ground water in the August 1995 excavation was encountered at a depth of approximately 7 to 8 feet bsg. Ground water flow direction in the Tracy area is generally to the north. 3.0. SCOPE OF WORK 3.1. DRILLING AND SAMPLING The PHS-EHD is requiring the performance of an investigation to determine the lateral extent of hydrocarbon-impacted ground water at the site. Therefore, AGE proposes to drill and install four