Laserfiche WebLink
Metadata
Document management portal powered by Laserfiche WebLink 9 © 1998-2015 Laserfiche. All rights reserved.
A <br /> USGS topographic maps indicate several wells in the vicinity located between one and two miles <br /> west, north, and east of the RV Park;the nearest located over one mile east of the site. <br /> SOILS <br /> Five soil trenches were dug on June 2, 2005 to investigate the soil profile. A summary of soils <br /> found in the soil trenches is provided in Table 5. The location of the soil profiles is provided on <br /> Figure 2. The trenches were dug to a depth of at approximately 100 inches. The near surface soil <br /> consisted of a heavy clay loam to a depth of 21 to 46 inches. Underlying soil consisted of sandy <br /> loam, loam, sand and hardpan. <br /> In addition, four monitoring wells were constructed in Iate May and early June 2007. The <br /> location of the monitoring wells is provided in Figure 2.Near surface sediments were dominated <br /> by silts and sandy silts to approximately 35 to 40 feet below ground surface (bgs). Sand units, <br /> less than five feet thick, were observed interbedded with the silt in monitoring wells MW-2, <br /> MW-3, and MW-4. Wet sands and silty sands, including layers of sandy silt to silt less than five <br /> feet thick, were encountered between 40 to 50 feet bgs. <br /> The Soil Survey of San Joaquin County, California [I] reports that the rate of water intake of <br /> soils at the site ranges between 1.0-1.5 in/hr(15-22 gpd/ft2). <br /> GROUNDWATER <br /> In this section a description of current groundwater conditions at the proposed subsurface <br /> dispersal site is provided. Consideration is given to groundwater quality and depth. Four shallow <br /> monitoring wells are installed at the RV Park on May 31 and June 1,2007. Groundwater beneath <br /> the site is located in a shallow,unconsolidated aquifer. <br /> Groundwater Depth <br /> Groundwater levels were measured in June 2007 and August 2007. Groundwater was <br /> encountered at depths ranging from 35.21 to 38.17 feet bgs, in June, and 41.40 to 46.71 feet bgs <br /> in August. A summary of groundwater elevations is provided in Table 6. <br /> Based on groundwater elevation measurements, groundwater flowed to the north to northwest in <br /> July 2007, and to the northwest in August 2007. <br /> Groundwater Quality <br /> Groundwater samples were collected from the monitoring wells in June 2007 and August 2007, <br /> and from the domestic well in June 2007. The results of the sampling events are presented in <br /> Table 7. <br /> Specific conductance (EC) concentrations ranged from 780 to 940 µmho/cm in samples collected <br /> from the monitoring wells in June 2007. EC was detected in the domestic well at a concentration <br /> French Camp—Report of Waste Discharge 5 SAB027102 <br /> July 2008 n:Lsab0271021documentslrwdlfrencheamprwdjuly rev final.doc <br />