SU0008552 SSNL - Laserfiche WebLink

Home Browse Search

TABLE 2 EHD OFFICIAL PERCOLATION TEST RESULTS FOR THE DISPOSAL AREA WITH CORRESPONDING APPLICATION RATES IN GALLONS /FT2/DAY 42 INCH DEEP PERC TEST BORING 31.5 min/inch / 0.545 gallons/ft'/day PERCOLATION RATE/APPLICATION RATE 24.75 FEET DEEP PERC TEST BORING 50.0 min/inch / 0.417 gallons/ft'/day PERCOLATION RATE/APPLICATION RATE Application Rate adapted from('alihomta State Water Resources Control Board Guidelines for the r)sign of&vage.Synems and is based on the Pete Rate. TABLE 3 EHD UNOFFICIAL PERC TEST RESULTS FOR THE STORMWATER BASIN AREA WITH CORRESPONDING APPLICATION RATES IN GALLONS/FTz/DAY 8 FEET DEEP PERC TEST BORING F 9.7 min/inch / 0.800 gallons/ft'/day PERCOLATION RATE/APPLICATION RATE Application Rate adapted from Cal fornia State Water Resources Control&mrd Guidelines for the Uestgn of Sewage S'ystemv and is based on the Pere Rate. D. GROUNDWATER INFORMATION 1 NLS§2.1, SSS§ 4.1. Groundwater depths and elevations throughout San Joaquin County are =J� C� illustrated on maps published by the County Flood Control and Water Conservation District. The most recent groundwater map denoting lines of equal depths was the Fall of 2011. The lines of equal elevation was published in the Fall of 2010. The depth to groundwater under the property is approximately 73 ft and the groundwater flow is in an easterly direction, toward a zone of recharge. No well log was found in EHD files for the referenced domestic well, so underlying lithology could not be determined. The well water was sampled and tested, as discussed below. NLS§ 2.2,3.1, SSS§ 2.1, 4.2. Since surrounding properties have been intensely farmed for a CZ. 1, number of decades in the past, and the fact that the Morada Area is entirely on septic systems, the potential for nitrate contamination in the underlying groundwater can be considered significant. However, groundwater research in the scientific literature suggests there may be a large �l denitrification potential within aquifers or saturated zones composed of a fine clay soil fraction, which has been observed in this area. NLS§ 2.3, SSS§ 43,4.4,4.5, 4.6. As referenced,the on-site domestic well was sampled for analysis of the two EHD required constituents. Well water was sampled from the hose bibb at the ( J south end of the existing on-site residential structure. The water was allowed to run for 30 minutes with the pump cycling several times to ensure that aquifer formation water was sampled and not stagnant well casing or tank water. A nitrate water sample was drawn into a one-quarter liter Lo bottle and the DBCP sample was drawn into three VOC glass vials with preservative. The C four sample containers were placed in a cooled ice chest and then stored overnight under refrigeration. 6.6� 5