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4 l'r I� (§ 4.0) LOCAL GROUNDWATER AND SURFACE WATER INFORMATION (§4. t t groundwater depths are not illustrated on the Lines of Equal Depth to Groundwater maps'produced by San Joaquin County in this region due to dramatic depth variability. The 1999 Lanes of Equal Elevation of Groundwater are also not published for this area. Therefore, flow _- direction cannot be determined. Given that groundwater typically flows with the topography of the land surface, flow can be estimated to be in a northeasterly direction. Well Drillers' Logs for nearby domestic wells were not found in the microfiche files at EHD. Therefore, the underground lithology specific to the subject property could not be discerned. Given that the property is located in a region that is heavily quarried for rock, gravel and sand, this is undoubtedly the underlying soil characteristics. Surface water runoff from the horse stalls will be diverted onto the surrounding acreage. 4.5 4.6.' p The domestic well on the subject properly was sampled for nitrate SSS§ 4.2, 4.3, 4.4, ] exclusively. EHD Unit II Program Managers waived the Dibromochloropropane(DBCP) requirement because there has never been any agricultural use of this product in this locale. It is my understanding the well is approximately 85 feet deep and was drilled in the 1930s. The water sample for analyses was obtained from a hose bibb next to the domestic well that serves all of the residential structures and horse barn structures. " After the well was allowed to pump for 10 minutes to ensure the sampling of aquifer formation water, a one-half liter plastic bottle was used for the nitrate analysis. 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. r Water analysis reveals a high nitrate concentr�r , at 46 ppm e amp well. The Maximum Contaminant Level (MCL) for nitrate (NO3)�i drinking wate i ppm. is high concentration may be attributed to the factors referenced above, c used by al formation. (§ 7.0) CONCLUSIONS The perc test results for the proposed effluent disposal area indicate passing and acceptable a percolation at the shallow depth of 42 inches representative of leachlines, and at near-typical sump depth of 10.5 feet. As noted from the test results, as the soil becomes further saturated,percolation potential decreased,but not significantly. (§ 6.8) It Ii sstanding that patrons of the horse ranch can attend to their ses on any ay "r eek,but the n ber of people on any give da own. There w' be no emplo ees. unisex bathroom wil a constructed in the s uthI st come of the new hors a toilet an e sink. T D Sew a e Standards a ply 150 gallon verage daily flow(ADF to one i toilet, The following calculations illustrate th a u' cd-4 chfield septic system structures: 1 Page 4- Chesney Consulting M