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C) June 14, 2005 NOA Project Number: E05034A F1Test No., Percolation Percolation Rate Test Comment Date Tested Test Depth(ft) (minutes/inch) Duration (see notes) P-4 shallow,6/8/2005 3.03 --- 4-hr No water drop observed the (Parcel 4) final half an hour,fail P-4 deep,6/8/2005 20.71 4-hr No water drop observed the arcel 4 I I final half an hour;fail Note: A satisfactory percolation rate for a"shallow test is less than or equal to 60 minutes per inch. A satisfactory percolation rate for a"deep"test is less than or equal to 30 minutes per inch. ✓ 6 .7 Discussion of Percolation Test Results F1 The soils within the sewage disposal areas of the site have not demonstrated a satisfactory percolation rate in accordance with the requirements of the EHD for the use of a standard septic system. The proposed parcels appear suitable for an engineered septic system, J.8 Discussion of Septic System Sizing FSeptic system construction should follow the San Joaquin County On-Site Wastewater Disposal 1, Standards where applicable. ri 1/7 0 CONCLUSIONS t In summarv. the nroposed Parcels 1 3,and J ativear suitable for an en ' eered sel2dcs stem since the percolation rates failed to meet EHD minimum.standards. We recommend a Civil._ Engineer prepare a septic system design for the proposed parcels unless additional percolation testing,performed under EHD oversight, achieves a satisfactory rate. Our office has been contracted by the client to prepare engineered septic system drawings for the property, they will follow this report shortly. f + No ground water was encountered in any of the borings drilled on the property. The depth to ground water was.found to be approximately 90-120 feet below the ground surface for the period of Fall 1998 and Spring 1999 based on the San Joaquin County Ground Water Maps. The on-site water well was tested for nitrate and DBCP. - F + F ri 11