ARCHIVED REPORTS_XR0003105 - Laserfiche WebLink

Home Browse Search

P equipment, it was not possible to clean up the pit, and operations were discontinued at approximately 11 .40am. After consultation with the representative of the County EHD, it was decided not to take any soil. samples at the time. Sampling would be deferred pending the arrival of larger equipment. On April 22, 1991 , after receiving approval from Mr. Knoll , a large dragline operated by Glenn Thorne began removing spoil from the pit in a westerly direction. Work continued on April 23, 1991 , also; removed spoil was placed on the north and west sides of the excavation, Mr. Hunter, R.G. , arrived on location at 10:40am on April 24, and received a sealed sample kit under proper chain-of-custody from f=GL laboratories. An examination of the site revealed that the sides of the excavation did not show any signs of contamination; no odor or discoloration was noted. The bottom of the excavation was slightly damp , but there was no standing water. The layer of purplish colored, well cemented mix of volcanic ash and sand at the bottom had a faint but noticeable petroleum odor, but no free product was noted, and a crushed sample placed in water did not exhibit any sheen or color. The dragline was moved to the north side of the pit, but due to the depth of the hole, and the configuration of the bucket, it was not possible to excavate any deeper. After consultation with the County representative, it was decided that further work was not warranted, and the dragline was taken off the location. The final dimensions of the excavation, (shown on Plate XI , ) were approximately 54 ' long and 50 ' wide; the depth graded from 22 ' at the west end to 25' at the east end. Approximately 1230 cubic yards of spoil were removed during the work conducted in 1991 ; 1120 CY had been removed during prior work, for a total amount of about 2350 cubic yards total . Operations then moved to the waste oil pit, where a backhoe was used to excavate approximately 1 ' of spoil from each of the four walls, and 4--5 ' from the bottom. There was a slight petroleum odor- and minor discoloration noted in a greenish gray sated on the bottom when first excavating, but none was noted when operations ceased at about 11 . 45am. After a lunch break., soil samples were taken with the backhoe bucket near the bottom of each of the four - sides of the excavation as directed by Mr. Hunter & approved by Mr. Knoll . Samples were carefully collected by Mr. Hunter in properly prepared brass tubes, immediately sealed, labeled, and placed on crushed ice in a sealed chest. The locations of the samples are shown on Plate XIV. Using the laboratory supplied brass tubes, 7 soil samples were collected from the pit which had contained the gasoline & diesel 5