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volume of diesel fuel spillage near the diesel fuel tank and a small volume of oil leakage near the oil drums. The San Joaquin County Environmental Health Department should be contacted for information on how to dispose of small volumes of oil and diesel stained soil. An important concern associated with the environmental assessment of agricultural properties is the issue of buried pesticide containers. It was an occasional practice to dispose of containers by this method many years ago. Detection of these types of underground artifacts is difficult-to- impossible even with the use of ground penetrating radar or other types of non-intrusive, subsurface analyses. The land surface did not exhibit visual indicators for buried containers such as surfacing of product residue, soil mounding or soil depressions. The static groundwater is found approximately 80 feet under the property. This is considered a comparatively deep elevation. Groundwater at this depth is not easily impacted from pesticides or nitrogen in the form of nitrates. The on-site soils consist of a medium to high clay content soil which can attenuate agrichemical residue in comparison to a sandy soil. The groundwater directional flow appears to be towards the northeast. To evaluate agrichemical residues as a nonpoint source of potential contamination, pesticide records were obtained for the last two years. The science of pesticide residues in soil, air, surface water and groundwater is extremely complex and variable. Environmental models which attempt to predict pesticide behavior and transport in the environment are beyond the scope of this investigation. It has been clearly evident over the last five decades that the risk/benefit ratio regarding pesticides has been an overwhelming benefit and comparatively low risk to the United States population, as a whole. Environmental fate data for the following pesticides which were applied to the subject property was obtained from the Illustrated Handbook of Physical-Chemical Properties and Environmental Fate for Organic Pesticide Chemicals: Proponil. Common name: Super Wham. Selective emergence and post-emergence herbicide to control many grasses and broadleaf weeds in rice and other crops. Half lives in the environment: Groundwater and sediment: half-life of-10 d for 40,ug/ml. Surface water: Hydrolysis half life> 1 yr(pH 4, 7, 9 and phytolysis half-life under optimum exposure conditions to natural sunlight is approx. 12-13 hrs in aqueous solution. Soil: Half-life of 1-2 days for 30 ,ug/ml. Glyphosate. Common name: Roundup. Half-lives in the environment: Surface water: > 9 wks under adverse conditions. Groundwater: unknown. Soil: half-life of< 10 ug/ml to biodegrade in soil-water suspension, moderately persistent in soil with half-life of 20-100 d with avg half-life of less than 60 d. 3 @Q-ality Ontrol Inspection