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FElevation water is found approximately 160 feet under the property as illustrated on the Lines of Equal Depth to Groundwater map. From the 1999 Lines of Equal roundwater, the groundwater directional flow appears to be toward the west- groundwater depth of 160 feet can be considered a deep groundwater elevation 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. § 4.0 EVALUATION OF PAST AND CURRENT SOURCES OF CONTAMINATION IDENTIFIED AT OR NEAR THE SITE AND RECOMMENDATIONS FOR FURTHER ACTION �§4.1 Evaluation of each potential and/or known source of contamination identified in the above Sections have been discussed in the respective Sections to facilitate the transfer of information to the reader. Recommendations are proposed in Section 5.0,below. ✓/Based upon the State Water Resources Control Board- GeoTracker System, there are no records of under ground (UST) storage tanks near the subject property. This is illustrated on the attached GeoTracker Site Map, which shows the nearest UST to be in the town of Lockeford. Potential environmental impacts from past,present or future facilities within a one mile radius of the property are unknown at this time,but unlikely. /The on-site wells have apparent fertigation systems. Fertigation is a precise method of dosing fertilizer in prescribed amounts through irrigation(hence the term"fertigation") applications so that fertilizer is applied accurately, corresponding with crop requirements. It is assumed that backflow prevention devices are on these systems and/or wells since it appears the systems are relatively sophisticated. Appendix C lists certified backflow prevention devise testers that can verify the backflow prevention devices. However it is my understanding, these systems are scheduled to be Y removed and new drip irrigation systems installed for the future vineyard. In this case, the backflow prevention devices for the new drip irrigation must be certified. Located in the extreme northeast comer of proposed Parcel l is an overhead water hose, a fenced storage area and several tires lying next to this fence. Because of the lack of information that should have been provided by the previous land manager, it is unknown whether agrichemicals were mixed and/or stored at this location. These tires are stored temporarily and are used to protect the roads from scarring when the track laying equipment is driven across them. It is my understanding they will be discarded properly at a tire receiving station once the tractor work is completed. //The science of pesticide residues in soil, air, surface water and groundwater is extremely complex and variable. Environmental models that attempt to predict pesticide behavior and transport in the environment are beyond the scope of this investigation. However,pesticides with long half-lives that may have been used or drifted onto the property decades ago, primarily DDT,may be of an extremely slight concern. DDT was used extensively throughout the agricultural fields of the San Joaquin Valley and degradates of DDT can be found in nearly all these soils. Page-5- Chesney Consulting