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Trillin. Common name: Trifluralin,Treflan. Half-lives in the environment: Groundwater: degradation time 9 days (d). Surface water: 21 minutes. Soil: Half-lives in clay loam are 4-5 d, with persistence to 6 mos. Phytolysis: Under optimum exposure conditions to natural sunlight, half life is approx. 22 minutes in direct sunlight. Goal. Common name: Oxyfluorfen. Half-lives in the environment: Air: 10.6 hrs. Surface water: 3.0-300 hrs. Groundwater: 3.0-1440 hrs. Soil: 97-251 hrs in dry soil, 4458-4688 hrs in saturated soil. Gramoxone. Common name: Paraquat: Half-lives in the environment: Not available1 Prowl. Common name:Rendiniethalin. Half-lives in the environment: Not available. Sulfur. Relatively non-toxic. May slightly irritate skin. Sulfur is utilized by virtually all living organisms for cellular synthesis. CONCLUSIONS AND RECOMMENDATIONS From visual observations,there is no surface contamination. The probability of subsurface contamination from pesticides can be regarded as low-to-nonexistent, considering the environmental fate data and soil type. Additionally,the likelihood of high nitrate concentration in the underlying groundwater is also low. Therefore we do not recommend the well water tested for a multi-residue pesticide screen consisting of analysis for Dinitroanaline, Triazine, Organochlorine and Organophosphates. The subject property is within a delineated area in which all new wells must have a grout seal to 200 tbet As referenced, future impact from the Harney landfill is unknown. If a new well should a drilled on Parcel 1, we recommend that the Envirofimental Health Department be contacted to ensure that grouting requirements have not changed. If water from the well on future Parcel 1 should become discolored, odorous, a change in taste, or produce skin reactions, we recommend the water be tested immediately for inorganic and organic constituents. It is our opinion that contamination originating from the existing septic tank is highly unlikely. Contamination from a tank is usually dependent upon the age and type of tank construction material. The next time the tank is pumped out,the sewage contractor can checys integrity. The density of septic systems in the surrounding area is very low. This, in combination with the fact that the groundwater is comparably deep, should indicate no concern from septic effluent. The septic tank and leachfield(assumed) are over 100 feet from the domestic well. Asbestos containing materials (ACM)testing from any portion of the existing buildings is outside the scope of this investigation. If the buildings are ever demolished,testing for ACMs should be done at that time. 4 `Uaffey Aq Pf search