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Environmental Fate Rate Constants orHalf-Lives: t/olatilization: Aquatic approx. 1 mo. Oxidation:.Aquatic half-life approx.22 yr Hydrolysis: half.-life of 570 d.@ pH 9 and 190 yr @ pH 5 § 3.5 Description of all current off site gbtential and/or known above and below ground sources of contamination identified in e area of the project site include those sites referenced in Sections 3.2, 3r3;and 3. above. These listed sites can be considered "past" off-site sources of contamination that are simultaneously"current"contaminated sources. § 4.0 EVALUATION OF PAST AND CURRENT SOURCES OF CONTAMINATION.IDENTIFIED AT OR NEAR THE SITE AND RECOMMENDATIONS'FOR.FURTHER ACTION § 4.1 Evaluation of each potential and/or known source of contamination identified in the above Sections have been.discussed in the respective Sections to facilitate the-transfer of.in.formation to the reader. . § 5.0 CONCLUSIONS AND RECOMMENDATIONS § 5.1 Evaluation of each point source potential contamination described(i.e.. the LUFT and UST sites, electrical transformers, de minimus items such as the septic tank) and non-point sources (i.e., agrichemical application,and non-target drift, nitrate and possibly DBCP in the underlying groundwater, and possible DDT soil coneentrations)_posean extremely low-to- nonexistent risk to the subject property and human health. It is impossible that any of the referenced LUFT sites, or non-point sources (other than nitrate and some types of agrichemicals) could affect groundwater under the subject property. It is unknown if there are any USTs immediately upgradient to the property. The adjacentdairy to the south may have_fuel tanks. It can be considered very unlikely that any tanks in this locale could affect the property because of the distances involved from the subject property. It is noted in the_Environmentalonn ' uesti Q azre that there is not an aboveground or underground. g storage tank on the property. The ASTM E-1527-00 Document referenced on Page 2 refers to de minimus environmental conditions. De minimus conditions generally do not present a material risk to human health or to the environment, and generally would not include an enforcement action if observed by the appropriate governmental agencies. Household hazardous materials.may be considered de minimus concerns if there has been.no spillage or dumping. None were observed. Typical household"hazardous materials" include gasoline, paint thinners, new and used motor oil, antifreeze,.etc. Spillage or dumping of hazardous substances was not observed. Chesney Consulting i