Laserfiche WebLink
i <br /> sources such as landfilling. Some of these parameters include <br /> ammonia, nitrate sodium, iron, magnesium, ►a►nganese and calcium. <br /> Although higher than average levels of any one of these inorganic .. <br /> compounds can be associated with natural causes, ie. high sodium <br /> levels near salt/fresh groundwater interfaces, elevated levels of <br /> many or all of these inorganic compounds are often seen atsociated <br /> with landfill areas. There are a number of reasons for this, some <br /> very complex, but simply stated it is because of the diverse and <br /> profuse nature of waste materials often deposited at these sites. <br /> Because of this, the inorganic analyses obtained from different <br /> sampling sources (See Table 1) can be utilized to provide a clue <br /> as to the source of observed groundwater contamination, BCHD used <br /> this information to prepare a graph of inorganic data obtained from <br /> this study. All the sampled wells located at Summerwood and the <br /> landfill were plotted with the inorganic data obtained from this <br /> study. (See Figure 1) The results ,indicate that the inorganic <br /> analyses at Summerwood differed significantly from the inorganic <br /> analyses of the landfill wells. <br /> Levels of VOCs in the Summerwood wells have been decreasing over <br /> time since the sampling began several years ago. It appears that <br /> & ' s conclusion that a "slug" of chlorinated solvents,, apparently <br /> the result of orie time dumping or dumping over a short period of <br /> time, has passed through the area with the groundwater flow. The <br /> higher concentrations of these VOCs which were present in wells <br /> several years ago appear to have been associated with a more <br /> concentrated portion of this slug passing through. Decreasing <br /> levels of VOCs seen over. time appear to indicate a "trailingoff" <br /> of the slue as it continues to flow to its .area of discharge, <br /> identified to be the Mashpee River. <br /> The levels of VOCs observed in Monitoring wells located at the <br /> landfill have been static over the two sampling rounds conducted <br /> by BIND. see Town of Mashpee-Report of Analysis conducted at <br /> Municipal Landfill by BCHED and W&S January 1989 Monitoring <br /> wells containing detectable levels of VOCs also contained a variety <br /> of them. These include W 12, 13 , and 14 (shallow) , B 3 & B4 , DPW <br /> monitoring well and the DPT service well . Wells that were free of <br /> observable contamination include W2 and W4 . which are upgradient <br /> and lateral to the landfill. respectably. Monitoring well W 1 <br /> (161) is a deep well located next to W14 (shallow) , no contamination <br /> was identified in this well at this time. These results do not <br /> imply any longterm trend since a trend of increasing, decreasing. <br /> or static levels of Voss can not be ascertained from two sampling <br /> rounds. The inorganic parameters were characteristically elevated <br /> in the impacted wells f 'the landfill.. <br /> I <br /> i <br /> L� - <br />