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_ w n TABLE 1 FERC :. 4 � DLATION.,TEST RESULTS AND RELATIED DATA PROPOSED PARCEL PROPOSED PERC TEST DEPTH POST SOAK PERC TEST AND SEPTIC SYSTEM ACREAGE SAND SILT CLAY %- PERIOD RESULTS STRUCTURE SOIL TYPE STATUS Parcel 1 2.3 Acres 36 Inches ` No Standing 7.1 77/in Leachlines 63%,26%, 11%- Sandy Loam Water in Hole (§ 4.0) LOCAL GROUNDWATER INFORMATION (§ 4.1) The 1999 Lines of Equal Depth Map and the Lines of Equal Elevation Map published by the San Joaquin County Flood Control do not illustrate the groundwater depth or flow direction for the Tracy area since the water table is extremely variable. It can be reasonably concluded that the groundwater is flowing toward Old River under most conditioner Under heavy river flow conditions, the River may give up water. Although there is a domestic well on-site, it could not be sampled since no pump has been installed in the well as of this date. Therefore, Sections § 4.3, 4,4, 4.5 and 4.6 are not applicable. (§ 4.2)Due to the proximity of Old River, the river will substantially influence groundwater elevation and quality. It has been observed throughout the County that typically there is very low, or nonexistent nitrate concentrations in wells and/or the water table next to rivers. Percolating effluent that reaches the water table will most likely undergo a dilution effect from the river's influence. As referenced in the Conditions of Approval directive, the EHD required depth to groundwater be determined. A backhoe was used to excavate down to the water table. It is my understanding that David Van Dyne of EHD witnessed the water table depth to be 8 ft below existing grade. While conducting the perc test, Ted Tasiopoulos witnessed another water table measurement to be at approximately 7 ft below grade. This discrepancy may be due to the Old River influence and the time allowed for the groundwater to stabilize. (§ 7.0) CONCLUSIONS (§ 6.$) The perc test results for proposed Parcel 1 show acceptable percolation for the management of the anticipated septic system effluent flows from the on-site single family residence. (§ 6.7) No problems are anticipated for this septic system, other than typical lifespan concerns. An engineered septic system will not have to be installed for this proposed Parcel unless there are continual failures. A 50% standby replacement area is located directly to the north of the existing leachfield. Page -3- Chesney Consulting