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u11.s FFAftertphe 4.5) The water sample for analyses was obtained from a hose bibb n7sampling f the domestic well that serves the residential structure and farm labor rcel 1. as allowed to cycle three times and pump for 15 minutes to ensure th aquifer formation water, three VOA amber glass bottles (with Sodium Thiosulfate preservative) were filled completely with water so there was no head space. A one-half liter plastic bottle was used for the nitrate analysis. (§4.6) The sample was placed in a cooled ice chest and transported under the attached Chain of Custody to A &L Labs in Modesto, California to be analyzed for nitrate and DBCP/EDB. Water analysis reveals a high nitrate concentratio ' at 39 pilin for the sampled well. The Maximum Contaminant Level (MCL) for nitrate (NO,) in dri king water is 45 ppm. This high concentration can be attributed to the intense agricultural produc _iwihis area for the past six decades, with potential contribution from the nearby septic system. (§ 7.0) CON NS The perc test results for proposed Parcel 1 sho acceptable rcolation for the management of septic system effluent flows at the typical leachh a depth o 2 inches. The percolation test for the subject Parcel indicates that near optimum percola ' s (not too fast or too slow)will exist within the soil environment under any new leachfield that may be installed in the future. EHD requires that there be sufficient distance for"treatment'of septic effluent before it encounters the groundwater table. This distance is normally regarded to be five feet in leachlines and 10 feet with sumps. Therefore, sufficient distance exists between the bottom of a leachline and/or sump and the current groundwater depth of 55 feet. (§ 6.8) For any future structure for Parcel 1, the number of leachlines and septic tank sizes will be dependent upon the number of bedrooms a house will have. (§ 6.7oNo oblems are anticipated for any future septic system on the property, other than typical lifesprns. Engineered septic systems will not have to be installed for this proposed subdinless there are continual failures for any new system. The peach trees currently on the Parcels will remain. The trees are flood irrigated; consequently, there may be inundated conditions. Tree roots will absorb nitrogen from any new leachfield if close enough. Although a significant problem with placing the leachlines down the tree middles (in-between tree rows) or near trees, is of course, root intrusion. Any new septic system must have at least a 50% standby replacement area incorporated into the design of the system. All related septic system structures and the new domestic well must comply with the published "distance" requirements from property borders, roads, structures, etc. As referenced, no seepage pits are allowed to be installed in this area. Page -4- Chesney Consulting