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Fummary of the perc test results are found in Table 2 below for the proposed disposal area: <br /> BLE 2 <br /> PERCOLATION TEST <br /> RESULTS,FOR THE DISpOSAL4AREA MOUND SYSTEM aJ- <br /> I <br /> PARCEL ACREAGE PERC TEST DEPTH POST SOAK PERC TEST <br /> PERIOD RESULTS <br /> TA_11S <br /> l Parcel 129-170-03 1.54 t Acres 24 INCHES No Pre-Soak- 250.0 min/in <br /> Was Done To <br /> Test <br /> Unsaturated <br /> Conditions <br /> 36 INCHES 8.4 Inches 0 min/in <br /> Standing <br /> Water in Hole <br /> After Pre- <br /> Soak <br /> 42 INCHES 11.0 Inches 250.0 min/in <br /> Standing <br /> Water in Hole <br /> After Pre- <br /> Soak <br /> D. GROUNDWATER INFORMATION <br /> NLS§ 2.1,SSS§ 4.1,NLS§ 2.1. Groundwater depths and elevations throughout San Joaquin <br /> County are illustrated on maps published by the County Flood Control and Water Conservation <br /> District. Due to the high groundwater elevations in the Delta, groundwater lines of equal depth <br /> and equal elevation are not drawn for the Delta area. Groundwater flow can be considered to be <br /> in an east-west direction, and is heavily influenced by tidal action. <br /> As referenced,'the measured water table depth of seven feet precludes the installation of of <br /> 'conventional; or.semi-conventional'leachfield system.;This is due to the required separation <br /> distance of five feet that must be maintained between the soil-effluent interface and the highest <br /> depth to the groundwater table. This separation distance was not an issue when the system was <br /> redesigned in 1990. <br /> Unfortunately, no well log was found in EHD files for the referenced domestic well, so underlying <br /> strata could not be determined. The underlying strata (aquifers) must have a high degree of <br /> hydraulic conductivity due to the fast well recovery after air purging in which the standing water <br /> level (5 ft below T.O.C.) recovered to the initial level immediately. <br /> NLS§ 2.2, 3.1, SSS§ 2.1, 4.2. Since surrounding properties have been intensely farmed for <br /> several decades, the potential for nitrate contamination in the underlying groundwater is <br /> significant. However, this was not the case with analysis of the well water, which showed no <br /> nitrate concentration. This can be attributed to the peat soils, and to the surrounding bodies of <br /> �y <br /> fresh water and tidal action. This phenomenon has been observed throughout San Joaquin County. <br /> 5 <br /> Chesney Consulting <br />