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1�4 1 � TABLE 5 SOIL PROFILE CHARACTERISTICS AND ANALYTICAL TEST RESULTS SAMPLE LOCATION, SAND,SILT AND STANDARD SOIL NITRATE- - PH/ SAMPLE DEPTH AND --CLAY PENETRATION .NITROGEN - CATION EXCHANGE (SAMPLE ID) PERCENTAGES - _ TEST(SPT): CONTENT 'CAPACITY - SOIL DESCRIPTION BLOW COUNTS; I (SOIL SOIL DESIGNATION` corvcervTRArlorv) (FERC RATE) NORTHEAST CORNER 72%, 18%, 10% 50;Very Dense 4 ppm NO,-N 8.4 19.1 meq/100g OF DISPOSAL AREA Sandy Loam Ty Densi very Low 2 FT DEPTH (16.7 MM/INCH) (NECT) NORTHEAST CORNER 34%, 52%, 14% 21;Medium Density 5 ppm NO,-N 8.2 14.3 meq/100g OF DISPOSAL AREA Silt Loam - Low 5 FT DEPTH (10.0 MIN/INCH) (NEC5) NORTHEAST CORNER 30%,28%,42% 36;Dense Density 5 ppm NO,--N 8.7 19.1 meq/100g OF DISPOSAL AREA Clay Low 10 FT DEPTH (15.6 MIN/INCF� (NEC10) NORTHEAST CORNER 20%,38%,42% 27;Medium Density 4 ppm NO,-N 8.6 14.3 meq/100g OF DISPOSAL AREA Clay Very Low 15 FT DEPTH (93.3 MW/INCH) (NEC15) SOUTHWEST CORNER 62%, 24%, 14% 30;Medium Density 9 ppm NON 8.6 14.3 meq/100g i OF DISPOSAL AREA - Sand Loam Low 2 FT DEPTH y (35.7 MIN/m1CIn (SWC2) SOUTHWEST CORNER 44%,48%, 8% 7;Loose Density 11 ppm NOa N 8.5 10.7 meq/100g OF DISPOSAL AREA Loam Low 5 FT DEPTH (25.0 MIN/INCH) (SWC5) SOUTHWEST CORNER 32%, 26%,42% 28;Hard Density 19 ppm NOj N 7.9 21.4 meq/100g OF DISPOSAL AREA Clay Medium 22 MIN/INCH) -10 FT DEPTH (SWC10) SOUTHWEST CORNER 32%,44%,24% 29;Hard Density 13 ppm NO,-N 8.0 14.8 meq/IOOg OF DISPOSAL AREA Loam Medium 15 FT DEPTH (250.0 MIN/rNCH) (SWC15) 3. GROUNDWATER / SURFACE WATER INFORMATION Ultimately, deep percolation of wastewater effluent, stormwater and domestic irrigation water recharge the underlying groundwater. This recharge volume is difficult to determine due to several factors such as evapotranspiration (evaporation and plant transpiration), horizontal conductivity, LEthat itation/domestic irrigation infiltration volumes. Stormwater from the project will be by on-site storm retention ponds and ultimately by City of Lathrop stormwater drains. The f the pond is unknown at this time, so the gradient of stortnwater recharge to the g groundwater is unknown at this time. Since the disposal area is proposed to be in the he property, and the groundwater predominately flows in a northerly direction, it is likely rge water could be cross-gradient or up-gradient to the disposal area. The subsurface fresh arge may have an unquantifiable dilution effect on the percolating wastewater effluent. Page -10- Chesney Consulting (