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1 The septic system density can be considered comparatively high in the Morada area, and surrounding areas. As referenced, nitrate impact from this source does not appear to be an issue at this point in time. The soils under the subject Parcels have historically had limited surface and subsurface percolation. Therefore, it will be a requirement of EHD to install sumps and seepage pits to manage septic effluent from future residential structures. As referenced, given the low density of septic system in this locale and the clay soil structures, there may be a comparatively lower nitrate impact from existing and future septic systems. Given that agricultural irrigation recharge is the largest single contributor to groundwater nitrate concentrations, and since the surrounding land has been farmed for several decades, it is assumed that the nitrate concentrations in the underlying groundwater would be in much higher concentrations than what has been observed in this area. Consequently, attenuating factors must be significant. As noted on the 1999 Lines of Equal Depth groundwater map, the static groundwater depth is approximately 65 feet. The lines of Equal Elevation map shows the groundwater directional flow to be in a southeasterly direction. The frontage road bordering the property and the areas in the"back" of the property should be patrolled on a regular basis to ensure there is no dumping of hazardous materials such as drug manufacturing chemicals. The private homesite on, and surrounding the property may contain lead paint, asbestos or hazardous materials that may or may not be typical. Typical household "hazardous materials" include pesticide sprays, gasoline, paint thinners, new and used motor oil, antifreeze, etc. The ASTM E-1527-00 Document referenced on Page 2 refers to de minimus environmental conditions. De minimus conditions generally do not present a material risk to public health or to the environment and generally would not include an enforcement action if observed by the appropriate governmental agencies. Household hazardous materials may be considered de minimus concerns if there has been no spillage or dumping. Spillage and dumping of any hazardous substance was not observed. The subject site is surrounded by properties to the north that engage in production agriculture. Noise and air pollution emanate from the Highway 99 Freeway. Consequences of this land use include: noise, dust, odors, insects, machinery, crop dusting aircraft, trucks, exhaust and other environmental effects that may be offensive to some people. LL 7 Chesney Consulting