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S� D Color Spot, Inc. 4 March 28, 1989 DRAFT (88168A) r ` for the product delivery line and one for the fill port. Adjacent to and west of the slab were two flat pieces of concrete whose use was not known. The concrete slab and the soils surrounding it were visibly stained by fuel, the source of which appeared to overspillage. A detailed plan of the UST area is shown on Figure 3 - UST Excavation Plan. The fuel dispenser was removed by JTO at 1100. The concrete slab r was removed at about 1130. Excavation to expose the tank using a John Deere 310C backhoe was begun at 1145. The soils removed from the excavation were monitored for total volatile petroleum hydrocarbon (TVPH) vapors with a photoionization ` detector (PID). The PID, a Photovac model TIP -I, was calibrated to an isobutylene gas standard of 20_ per mi (ppm) provided by Alphagaz (Lot 28201). Soils exhibiting more than 30 ppm_, As measured on the PID, were considered contaminated and-weresegregated and piled on plastic sheeting. Soils removed from the immediate vicinity of the south end of the UST, fill port, vent line, and product delivery line exhibited TPH concentrations ` of 50 to 200 ppm and were segregated. Soils from the remainder of the excavation exhibited TPH concentrations of about 1 to 2 ppm and were considered uncon- taminated. At about 1215, with about 40 percent of the UST exposed, a previously undetected 4 -inch PVC water main was struck by the backhoe and broken. The water main ran directly over the top of the tank and had not been identified to JTO by Color Spot personnel. The water was shut-off about four minutes after the main was broken, and by about 1315 the excavation had been pumped out using a trash pump provided by Color Spot. The remainder of the afternoon was used to r fully expose the tank which was 75 inches in diameter and 17 feet long. The electric line for the main gate was also encountered running over the top of the UST. The power to this line was shut off and the line disconnected. The UST was located directly beneath the property fence (refer to Figure 3). r The soils removed from the west, east, and north sides of the tank were monitored with the PID and the monitoring results ranged from 1 to 9 ppm. The soils were considered uncontaminated and were piled on the uncontaminated piles. Additional)st ined;—bdorous soils were removed from the southwest corner of the excavation and placed on the contaminated soil pile. At about 1500 the .. broken water main was temporarily repaired and placed back in service (it is the main supply line for most of the property). At 1755, excavation was terminated for the day due to the approach of darkness. The contaminated soil piles were covered with plastic sheeting. r On March 1, 1989, between 0740 and 0905, the soils in all four piles (refer to Figure 3) were monitored for volatile organic hydrocarbons with the r PID (which had been recalibrated as described above). The uncontaminated piles exhibited volatile organic vapor concentrations ranging from 0 to 1.8 ppm and the contaminated soil piles from 9 to 292 ppm thus verifying the previous day's ` monitor ng resu ts. r