ARCHIVED REPORTS XR0001002 - Laserfiche WebLink

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of contamination decreased, although a definite petroleum odor was still apparent There was evidence of staining on the south wall beneath the storm drain line, and minor indications of contamination on the north wall in the lenses of sticky blue-gray clay_ The west wall showed some manor staining, but the bottom was still contaminated. It was decided to excavate as deep as possible in order to determine how deep the diesel fuel had leaked. At a depth of 35' , the spoil started to become moist, and at 37' below grade, groundwater began to slowly enter the bottom. Although there was no apparent rainbow or sheen noted on the water, the removed spoil had a definite petroleum odor. Linda Turkatte from the County EHD arrived on location at about 1530 hours, and after discussing the situation, it was agreed to take two (2) samples from the deepest part of the hole. Martin Thorpe removed some soil from the bottom with the excavator bucket; it consisted of wet sandy clay & slightly plastic clay_ Fred Sav of GeoAnalytical Laboratories took two soil samples from the bucket as directed by Mr. Hunter, the geologist in charge. They were sealed and preserved as described earlier, and placed on ice. The samples were transported to the lab under chain of custody with instructions to analyze for BTEX & TPH (diesel, kerosene, & motor oil ) PLATE IX shows the approximate locations of the soil samples taken on 12/13 & 12/15. Laboratory results are summarized on TABLE VII, copies of the reports & chain of custody is included as EXHIBIT F A total of 482 cubic yards of spoil was removed from the site on December 13 & 15th & hauled to Forward, Inc. Approximately 410 cubic yards of pea gravel & aggregate (road base, ) were used to fill the two excavations in order to return the site to it' s original condition Copies of the non--hazardous waste manifests & haul tickets are included as Exhibit G. REVISEI) WORKPLAN FOR SOIL & GROUNDWATER INVESTIGATION The following workplan is for the purpose of placing eight (8) soil borings and converting four (4) of them to groundwater monitoring wells in the approximate locations shown on the PLATE XI . Soil borings A & B are programmed to be advanced to approximately 35' below grade, or to the water table. Soil samples will be taken at 5 foot intervals from 5' bgl to the capillary fringe. Discrete water samples will be taken in each soil boring by driving a hydropunch or similar device into the groundwater. Soil borings C & D are programed to go to 25' bgl ; water samples will not be taken. Soil samples will be collected at 5 ' intervals from 5' bgl to the capillary fringe in all four monitoring wells; they will be completed as described below. 1 _ Mobilize properly licensed auger rig & support truck 6