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r <br /> r <br /> DISCUSSION AND ANALYSIS OF FIELD & LABORATORY WORK PERFORMED: <br /> Estimate of lateral extent of soil contamination: <br /> As a result of the work performed at this site, the extent of <br /> soil contamination appears to have been well defined. Plate VIII <br /> is a plan view of the property which lists the laboratory results <br /> ' of the sail sampling during the three stages of investigative <br /> work. The estimated maximum limit of soil contamination is <br /> indicated by the dashed line. It appears that the contamination <br /> is below a depth of between 4 to b feet, and is primarily <br /> ' restricted to a very plastic bluish-grey clay of limited extent. <br /> Cross-sects ons A-B and C--D, (Plate XI , ) indicate the <br /> configuration of the soils encountered during the work. Although <br /> laboratory analysis of soil samples from some of the work done on <br /> November b were below detection limits, petroleum odors and <br /> visable staining .were noted in some of the spoil removed. This <br /> suggests that the contamination is not uniform, and the samples <br /> ' that were collected missed those areas. <br /> Estimate of lateral extent of water contamination: <br /> Plate IX shows the estimated lateral limits of water <br /> contamination based on laboratory analysis and field <br /> ' observations. Although contamination was only detected in two <br /> borings, (Auger Holes A-3 & B, ) it is assumed that may be present <br /> in areas where soils are impacted. An approximate "zero" line is <br /> indicated on the map, which generally mirrors that for soil . The <br /> ' vertical extent of contamination has not been determined, but <br /> is most likely restricted to the uppermost few feet. <br /> ' Estimate of water level & gradients <br /> As a result of the investigative work, groundwater was noted in <br /> ' several of the auger holes. Although measurements are inexact, <br /> an attempt was made to estimate the depth and configuration of <br /> the water table. The result of that estimate is shown on Plate <br /> X, which show that the shape of the plume closely matches the <br /> ' estimated top of the water. This adds further credence to the <br /> conclusion that both the vertical and horizontal extent of the <br /> contamination has been adequately delineated. <br /> ' CONCLUSIONS: <br /> ' Based on the analysis of the investigative work done at this <br /> site, it is believed that the vertical and lateral extent of both <br /> sail and groundwater contamination have been determined, and that <br /> 1 <br /> 1� <br /> 1 <br />