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AdIkL <br /> Soil: Half-lives in clay loam are 4-5 d,with persistence to 6 mos. <br /> Phytolysis: Under optimum exposure conditions to natural sunlight,half <br /> life is approx. 22 minutes in direct sunlight. <br /> Goal. Common name: Oxyfluorfen. Half-lives in the environment: Air: 10.6 hrs. <br /> Surface water: 3.0-300 hrs. Groundwater: 3.0-1440 hrs. Soil: 97-251 hrs in <br /> dry soil, 4458-4688 hrs in saturated soil. <br /> Gramoxonc. Common name: Paraquat: Half-lives in the environment: Not available. <br /> Lorsban. Common name: Chlorpyriphos. Half-lives in the environment: Air: 6.34 <br /> hrs. Surface water: 9.0 days. Groundwater: Sediment: 24 days. Soil: Less <br /> than one week in sandy loam. Phytolysis: 22 days under midday sunlight. <br /> Hydrolysis: 53 days. <br /> Diazinon. Photooxidation: 4.1 hrs. Surface water: 43 d in river water. Soil:12 wks. <br /> CONCLUSIONS AND RECOMMENDATIONS <br /> From visual observations,there is no surface contamination. The probability of subsurface <br /> contamination from pesticides can be regarded as low-to-medium, considering the environmental <br /> fate data and soil type. The likelihood of high nitrate concentration in the underlying <br /> groundwater is medium-to-high given the sandy nature of the indigenous sandy soil and high <br /> groundwater table. If well water will be consumed from the exiting well, we recommend the <br /> water be tested for a multi-residue pesticide screen consisting of analysis for Dinitroanaline, <br /> Triazine, Organochlorine and Organophosphates. However,we recommend that bottled water <br /> be consumed. <br /> It is our opinion that contamination originating from the existing septic tank is highly unlikely. <br /> Contamination from a tank is usually dependent upon the age and type of tank construction <br /> material. The density of septic systems in the surrounding area is very low. This fact should <br /> indicate little concern from septic effluent emanating from surrounding leachfields. <br /> Asbestos containing materials (ACM)testing from any portion of the existing buildings is <br /> outside the scope of this investigation. If the buildings are ever demolished,testing for ACMs <br /> should be done at that time. <br /> 4 <br /> *alityControl Tomion <br /> ®f . <br />