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Groundwater Quality Monitoring Plan <br /> Table 4: Parameter Exclusion Rationale (7-7-2023) <br /> Analyte Exclusion Rational <br /> Human and animal waste contain fecal coliforms. Bacterial coliforms are <br /> naturally found in the environment. Ingestion of coliforms is dangerous and can <br /> cause serious illness or death. It is expected that coliforms may be present in <br /> Colifo groundwater throughout Colorado and the sources are associated with <br /> (30-day a aververagg e) excrement from animals in the natural environment. There are no coliforms <br /> being generated from mining activities at the LGE-West Farm site and as such, <br /> coliforms should be excluded from the monitoring parameter list. <br /> Asbestos is a mined mineral with special characteristics of strength, filtration, <br /> and fire resistance. Asbestos was widely used in products in the first part of the <br /> 20th century. Later it was found to be a lung carcinogen and is now known to be <br /> an ingestion hazard as well.Asbestos uses are limited,and it is generally omitted <br /> from products where it was once found. Asbestos abatement from schools and <br /> private structures has been ongoing since the mid-1980s. Asbestos from <br /> abatement products is strictly regulated and documented disposal is required. <br /> Asbestos fibers in soils are regulated by CDPHE, and when found, are required <br /> Asbestos to be removed and disposed of properly. Asbestos is not associated with the <br /> geology of the LGE West Farm site and should not be in natural formations at <br /> the site. It is regulated because it is a known carcinogen and water containing <br /> asbestos should not be consumed.The groundwater at LGE-WF site should not <br /> contain asbestos. There are no asbestos mines in Colorado. Water at the LGE <br /> West Farm site is not used for drinking water. There is no reason to expect <br /> asbestos in the groundwater and it should be an excluded parameter for the <br /> LGE-West Farm site. <br /> Free cyanides are the cyanide containing compounds that can liberate cyanide <br /> gas in a neutral or slightly acidic environment. Hydrogen cyanide is the most <br /> common free cyanide. Sodium cyanide and potassium cyanide are readily <br /> soluble in water and, like hydrogen cyanide, produce cyanide gas in slightly <br /> acidic water. Cyanide gas and free cyanide in water are extremely poisonous. <br /> Free Cyanide However, cyanides have to be introduced from a source, a pollutant in the <br /> water. Cyanides are not used, produced, or found in any mining activities at a <br /> sand and gravel mine. Cyanides may be associated with precious metal mining <br /> during heap leaching or related activities, but they are not at a sand and gravel <br /> mine.There are no manufacturing facilities around the LGE West Farm site. For <br /> these reasons, free cyanides should be excluded from the groundwater <br /> monitoring parameter list. <br /> Chlorophenol is a group of organic compounds that are synthesized and not <br /> generally found in nature except as pollutants from a specific source. <br /> Chlorophenol Chlorophenols are only slightly soluble in water.The most commonly identified <br /> and chlorophenols are: <br /> Phenols <br /> • Monochlorophenol - used in modest volumes, as dyestuff <br /> intermediates and in the manufacturing of higher chlorinated phenols <br /> • Dichlorophenol - used in larger volumes in the manufacture of the <br /> herbicide 2,4-D and other related chlorinated herbicides <br /> rg,®MOLEN LG Everist Monitoring Plan <br />