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WASTE DISCHARGE REQUIRL­-ENTS ORDER NO. 4 <br /> LINNE ESTATES,LLC <br /> LINNE ESTATES WASTEWATER TREATMENT SYSTEM <br /> SAN JOAQUIN COUNTY <br /> Groundwater Considerations <br /> 25. The development will be served by an on-site water supply well. The well is approximately 706 <br /> feet deep and the screened intervals are 542-582, 598-608, 632-642, and 666-706 feet below <br /> ground surface. The water quality of the well was tested on 3 September 1999. Water quality is <br /> presented in the table below: <br /> Constitiuent Units Concentration <br /> Total Hardness mg/L 260 <br /> Sodium mg/L 66 <br /> Chloride mg/L 94 <br /> Nitrate as NO3 mg/L 21 <br /> Total Dissolved Solids mg/L 610 <br /> Specific Conductance µmhos/cm 930 <br /> THMs' gg/L ND(0.5)Z <br /> ' THMs denotes trihalomethanes. <br /> 2 ND denotes Not Detected(detection limit shown in parentheses). <br /> 26. Three groundwater monitoring wells were installed on 27, 28, and 29 August 2003 in the dispersal <br /> area, as shown on Attachment C. Based on data collected on 11 September 2003 and 29 <br /> December 2003, the groundwater exists approximately 50 feet below the ground surface and flows <br /> to the northwest under a gradient of 0.001 ft./ft. Well MW-1 is likely to be established as the well <br /> upgradient upgradient of the dispersal area. Groundwater samples were collected and analyzed. A <br /> summary of the average groundwater quality is presented below: <br /> Well NO3 as N Chloride TDS VDS SC TCO FCO <br /> (mg/L) (mg/L) (mg/L) (mg/L) (µmhos/cm) (mpn/100 ml) (mpn/100 ml) <br /> MW-1 20 326 1280 275 1805 ND (2) ND (2) <br /> MW-2 13.2 335 1195 230 1755 ND (2) ND (2) <br /> MW-3 14 319.5 1180 310 1730 ND (2) ND (2) <br /> NO3 as N denotes Nitrate as Nitrogen. TDS denotes Total Dissolved Solids. <br /> VDS denotes Volatile Dissolved Solids. SC denotes Specific Conductance. <br /> TCO denotes Total Coliform Organisms. FCO denotes Fecal Coliform Organisms. <br /> ND denotes Not Detected,detection limit shown in parentheses. <br /> 27. The groundwater monitoring wells were installed prior to finalization of the wastewater system <br /> plans. As a result, the wells do not adequately monitor the dispersal area. Additional wells are <br /> required by this Order to improve the groundwater monitoring network. <br /> Site Specific Conditions <br /> 28. The 100 year return annual total rainfall, based on data from Tracy Pump weather station, is 21.87 <br /> inches per year. <br /> W:&aWbrienTSun JouquinLLinne Estulw\Unne_WDR r Ldao <br />