Laserfiche WebLink
Harding Lawson Associates <br /> ' wells are located in the eastern portion of the site. Since the magnitude of the <br /> odors and the consistency with which odors were noted is unknown, these odors <br /> should not be used as a means of estimating chemical distribution in soil. <br /> B. Ground Water <br /> Measured thicknesses of free product observed in wells are shown in <br /> Table 3. The variances in thickness of free product over time may be associated <br /> ' with on-site remedial pumping in Wells 1, 15 and 17. It should be noted that <br /> occurrence of free product is localized and may not necessarily extend over large <br /> tareas. <br /> Although wells with free product were not sampled, it is likely that <br /> concentrations of BTXE would be found in ground water in those wells. However, <br /> ' no inferences can be made concerning the concentrations in those wells. <br /> Three rounds of ground-water samples have been collected from selected <br /> wells on site by HLA for chemical analysis. Wells in which free product was <br /> detected were not sampled. Other wells were selected to provide representative <br /> coverage across the site. Samples were analyzed for aromatic volatile organics <br /> ' (EPA Test Method 602) and total organic carbon. Complete chemical analysis <br /> results are shown on Table 2. Results of analyses for benzene, toluene, xylenes, <br /> tand ethylbenzene (BTXE) are shown on Plates 12 through 14. <br /> The highest observed chemical concentrations in ground water on site are in <br /> ' Wells 15 and 17. Wells in the northwestern portion of the site have consistently <br /> shown no detection of chemicals. <br /> 1 <br /> November 24, 1987 7 of 9 <br /> ' B2203-R <br />