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P f, 3.3 Gi aundwatei•Quality Shallow groundwater samples were collected from seven hydropunch locations as part of ' the November 2005 Eco;Logic study. The groundwater samples were analyzed for several constituents. Three constituents pertinent to the land application of treated wastewater,total dissolved solids (TDS), electrical conductivity (EC), and nitrate as nitrogen (NO3-N), are discussed in this section. These constituents are summarizedin Table 2. Al.more detailed discussion of the results of the groundwater investigation can be found in the Eco:Logic report. i �s TABLE 2 k GROUNDWATER QUALITY DATA' if ]Ii LIN FAMILY PROPERTIES ° Sample TDS, EC, NO.3-N, ID !t m L mho/cm m Location HPA 660 1,140 4.6 Southwest comer HP-2 2,170 3,630 53.1 Northwest corner HP-3 4,170 5,370 30.5 North corner j HP24 4,160 6,910 61.0 Northeast edge HP-5 1,890 3,130 27.1 Center HP-6 3,650 4,390 24.8 South edge - HP-1 8,700 11,100 70.0 Southeast comer Data from March 2006 Eco:Logic report. 11] As seen in Table 2, TDS and EC concentrations are generally higher in the eastern and _ northern portion of the property. and lowest in the southeastern portion of the site. - NO3-N concentrations followed a similar trend. Figure 2 presents the location and results of groundwater sampling for TDS, EC, and NO3-N. The results of the baseline groundwater data indicate that a treated waster«vater dispersal system can be located and designed to meet or exceed regulatory requirements not to degrade groundwater quality. 4.0 COLLECTION,TREATMENT,AND DISPOSAL SYSTEM r The proposed decentralized treatment system for the Lin Properties consists of collection, i treatment, and disposal components. The collection system will consist of clustered septic tanks, which will receive wastewater generated from house clusters, and small diameter gravity or force mains. Primary treatment of wastewater will be accomplished in the collection system. There are many available manufactured and engineered onsite treatment systems. For sizing and cost estimating purposes, a recirc media filter and W disinfection is assumed to treat wastewater generated by a future development at the property. The dispersal system will consist of a subsurface drip p, dispersal system. The collection, treatment, and dispersal systems are described in more detail in this section. .S Ey Decentralized Treatment for Lin Family 4 SAB038100 December 2008 N:1SAB038E001Documents120081219 UnPropWW_Drafl.thc s