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..i <br /> FrData <br /> vironmental fate data for the applied herbicides have been documented. This list <br /> is data, and suggests the half-lives of the listed materials are comparatively fast. <br /> tained from the Illustrated Handbookof Phvsical-Chemical Properties antal Fate for Organic Pesticide Chemicals: <br /> DICAMBA. Common name: Clarity. Half-lives in the environment: Air: 2.42-6.0 days. <br /> Soil: estimated persistence of 2 mos. Half life of 59, 19 and 17 d. under <br /> various conditions. Under heavy clay soil 50%degraded in 2 wks. <br /> Groundwater:23.5 d. @ 28 degrees C. <br /> CPA. Common name: Rhomene MCPA Amine. Half-lives in the environment: <br /> Air: Unknown. Soil: 50 d. in sandy clay. 168 hrs in sludge and 9 d in <br /> natural waters. Groundwater sediments: 80 to 400 d. at low concentrations <br /> CONCLUSIONS AND RECOMMENDATIONS <br /> From visual observations, there is a comparatively small amount of surface contamination from <br /> the pumping and refilling of the above ground diesel tank, and from the above ground fertilizer <br /> tank. Greater care should be taken when refilling fertilizer application tanks. The probability of <br /> groundwater impact from these two substances can be considered slight. Subsurface <br /> contamination from pesticides can also be considered low-to-nonexistent, considering the <br /> referenced environmental fate data. The surface soil type is predominately a clay soil. The <br /> biological activity of this soil type would be expected to be higher than in sandy soils, thus <br /> creating a favorable environment for microbial decomposition of organic molecules. <br /> Depending upon the results of the water tests from the existing well,the new domestic well to be <br /> installed should be tested for nitrate and DBCP. It is recommended that bottled water be used for <br /> drinking and cooking. The subject property is outside delineated areas in which all new wells <br /> must have a erout seal to 200 feet. <br /> It is our opinion that contamination originating from on-site, or nearby septic systems is very <br /> slight due to the extremely low density and large area. Density of septic systems is a prime <br /> factor for nitrate contamination of the underlying groundwater. If high nitrate concentrations <br /> exist in the underlying aquifers, it is most likely from agricultural inputs. <br /> Page -4- <br /> Va4ey Ag?research <br />