SU0006112 SSCRPT - Laserfiche WebLink

Home Browse Search

The land surface did not exhibit visual indicators for buried containers such as surfacing of product residue, soil mounding, or soil depressions. It is usually only after a contaminant plume has impacted a domestic well that buried pesticide containers are discovered. If buried items are discovered during any future earthwork procedures, etc., the San Joaquin County Environmental Health Department must be contacted immediately. / § 3.4, § 3.5 It is a possibility minute volumes of agrichemicals sprayed on surrounding properties may drift onto the subject property, in addition to the agrichemicals applied to the subject acreage. The site can be considered in the predominant downgradient windshed to other vineyard acreage. In addition, the San Joaquin County Mosquito Abatement District may spray for mosquitoes on and around the property,particularly Coyote Creek. ✓The herbicide Roundup and the miticide Omite have been applied to the walnut and vineyard for weed and mite control, respectively, with the last application in 2004. Environmental Fate Data for Roundup is found in Appendix D. Environmental Fate Data for Omite (Propargite) was not available from Extoxnet. Mixing of Roundup with water occurs next to the ag building or barn, on the paved surface. ./An important concern associated with the environmental assessment of open properties is the issue of buried containers or discarded items. It was an occasional practice to dispose of containers or discarded items by this method many years ago. To detect these types of underground artifacts is difficult even with the use of ground penetrating radar or other types of non-intrusive, subsurface analyses. ✓Four electrical transformers were observed on the property. No oil leakage was noted since the transformers appear to be relatively new. From previous Nitrate Loading and Soil Suitability Studies done south of the property, it is known there are low concentrations of nitrate in the underlying drinking water aquifers, closer to the town of Clements. This can be attributed to the comparatively deep groundwater elevation, and intervening strata of clay and hardpan down to the zone of saturation. If high nitrate concentrations are detected under the property, or in the future, it can be attributed to the application of nitrogen fertilizers in the surrounding agricultural environments. Since wine grapes require relatively little nitrogen, the on-site vineyard has not be excessively applied with nitrogen fertilizers. ✓ Static groundwater is found approximately 150 feet under the property as illustrated on the attached 1999 Lines of Equal Depth to Groundwater map. From the 1999 Lines of Equal Elevation of Groundwater, the groundwater directional flow appears to be toward the west- southwest. A groundwater depth of 150 feet can be considered a deep groundwater elevation which cannot be easily impacted from serious point source releases and agrichemicals such as pesticides,herbicides, or nitrates from fertilizers. The degree of impact from adverse constituents can be mitigated when there are intervening layers of clay soil down to the water table depth. Page -4- Chesney Consulting �-