SITE INFORMATION AND CORRESPONDENCE

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8/31-9/1/88 Seven additional soil samples were colleted from the southwestern excavation area. The highest result was 4 ppm. 12/07/88 Excavation was backfilled. The contaminated stockpile and the pea gravel. pile from the excavation was redistributed on site. 07/31/89 Site was entered into Local Oversight Program (LOP) . October 89 6 borings B-10 to B-15 were advanced south and southeast of the former UST area. Groundwater and soil samples were collected. B-10 was converted into MW-4. The highest contaminant concentration was 2,400 mg/kg of TPPH from B-15 soil sample at 25 feet bsg, which was south of the former UST area. 11/02/89 16 soil samples from the spread stockpile and pea gravel were collected and analyzed. Highest results were 23 mg/kg of TPPH. 12/11/89 RWQCB letter approving redistribution of aerated soil at the site. March 91 Boring B-16 was advanced east of B-15. Results of soil sample were 1,300 mg/kg of TPPH. . 08/22/91 MW-1, 2, and 3 were destroyed because the wells went dry. Groundwater sampling. was performed in March 1991. The highest results were from MW-1 at 370µg/l of TPH-d. 11/91 6 borings B-16 to B-21 were advanced south of the former tank area and on both sides of Navy Drive. Results of soil sample from B-19 at 30 feet bsg on the north side of Navy Drive were 3,200 mg/kg of TPH-d, and from B-21 on the south side of Navy Drive were 1,200 mg/kg at 30 feet bsg. B-17 and B-21 were converted into MW-5 and MW-6 (screen 251-451 ) . 09/21-22/95 12 shallow hand auger samples KHA-1 to KHA-12 were collected on site in the area where the stockpile was spread, the acid neutralization tank, clarifier, and the former boiler fuel supply line to the former USS'. Highest results were 3 .6 mg/kg of TPH-d at 3 feet bsg from the KHA-5 sample. 6 exploratory soil borings KB-1 to KB-6 were advanced around the wastewater treatment plant and pretreatment pond to 25 feet bsg to investigate if contamination had occurred from non-UST related activities. These samples were not analyzed for petroleum hydrocarbons. Cone penetrometer boring CPT-1 to CPT-4 were advanced on site to about 40 feet bsg, and CPT-5 and CPT-6 were advanced to about 50 feet bsg. Based on CPT data 9 hydropunch samples KHP-1 to KHP-9 were collected around the property between 38 feet bsg to 41 feet bsg. Highest results were 1,200 µg/l of TRPH from KHP-7 northeast of the former tank area at 38.5 feet bsg, and KHP-9 east .of the former tank area at 38 feet bsg. 10/16/95 Date of "Limited Phase II Environmental Site Assessment" that reports September 1995 work. 3/96 Date of UST Case Closure Summary Report. 8/22/96 Environmental Health (EHD) Technical Review Committee (TRC) discussed closure of the site.