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rD:77nimmionname:DDD,TDE(tetrachlorodiphenylethane),product of DDT deg. Half-lives in the environment: Air: 17.7-177 h Surface water:2-15.6 yr. Groundwater: 1680-270,000 h based on anaerobic soil study data Sediment:N/A Soil:Field half life of 2-15.6 yrs based on observed rates of biodeg. of DDT / Biota: 119 hr in mussels. Environmental Fate Rate Constants or Half-Lives: Volatilization: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 potential and/or known above and below ground sources of contamination identifi in a area of the project site include those sites referenced in Sections 3.2, 3.3, and 3.4 a ove. These listed sites can be considered"p" ff-site sources of contamitiat pn 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 l information to the reader. § 5.0 CONCLUSIONS AND RECOMMENDATIONS § 5.1 Evaluation of each point source potential contamination described(i.e.,the gL T and UST sites, the electrical transformers, de minimus items such as fuel-cans, and th two tic tanks, etc.) and non-point sources (i.e., agrichemical application and non target drift, nitrate and possibly DBCP in the underlying groundwater, and possible DDT soil concentrations) pose a very low-to-insignificant risk to the subject property and human health. It is impossible that any of the referenced i i TFT cites, or non-point sources (other than nitrate) could affect groundwater under the s property. There is an UST directly upgradient to the property; however,they s no a dente of leakage from this tank and it may be considered unlikely to affect the prope cause of the distances involved. 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 public 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. Page -7- Chesney Consulting