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SEP-29-2000 10: 18 P.05i06 <br /> Table 2. Groundwater Quality Along the Southern Side of Spreckels' Property(') <br /> Parameter WP-1 WP-1 BW-2 BW-2 13W-4(deep) B3 B4 B5 <br /> Calcium 76 79 228 245 46 43 390 170 <br /> Magnesium 62 72 50 43 16 33 730 210 <br /> Potassium <5 1.7 <5 2.8 1.4 4 21 ' 1 <br /> Sodium 587 636 211 303 75 720 8,100 1,000 <br /> Chloride 571 640 257 259 43 140 2,600 520 <br /> Sulfate 250 264 519 764 135 780 16,000 2,200 <br /> Nitrate — 22 — 31 4.8 34 nd I nd <br /> Carbonate nd nd — — nd nd nd nd <br /> Bicarbonate 661 886 299 584 nd 710 480 630 <br /> Boron — 3.3 — 4.5 0.83 17 66 11 <br /> Manganese 0.096 0.344 0,79 0.99 0.031 nd 0.32 f 1.7 <br /> TK--N — 0.6 — — 0.2 10 10 I? <br /> BOD <3 — — — — nd nd nd <br /> pH 7.5 6.8 7.3 8 — — <br /> TDS 1,890 2,250 1,640 2.070 430 2,400 29,000 4,800 <br /> TFDS -- — — — — 2,100 28.000 4,300 <br /> Sum of Salts 1,949 2,258 11,447 2.009 — 2,204 28,200 4,496 <br /> EC 3,380 3,650 2,150 2,840 675 3,560 29,400 6,210 <br /> TOC — 5,2 — — nd 14 15 24 <br /> Source THC `92 K.S. `98 THC `92 BC `99 K.S_ `98 BSK `99 BS.K `99 BSK `99 <br /> Scrcened Interval — -- 11-21 11-21 82-102 0-20 0-20 0-19 <br /> ") All values are in mWL,except EC (umhos/cm)and pH <br /> PROPOSED ADDITIONAL MONITORING WELLS <br /> Two additional permanent monitoring wells are proposed for the western portion of the <br /> washwater irrigation area. The approximate locations of these proposed wells are shown in <br /> Figure 1. The exact locations of the wells will depend upon landowner approvals_ If the final <br /> locations are significantly different than those shown i.rt Figure 1, the locations will be submitted <br /> to Regional Board staff for approval. The wells will be constructed to a depth of approximately <br /> 30 feet in a similar design to the existing monitoring wells, depending upon conditions <br /> encountered. The monitoring wells will be drilled with a hollow stem auger, allowing'split spoon <br /> samples to be taken every five feet for accurate logging. The top ten feet or more of the wells <br /> will be ,ealed, and the wells will have locking caps. A typical design for the monitoring wells is <br /> shown in Figure 2. Together with existing wells 13W-2 and BW-4, these new wells will provide <br /> adequate characterization of background groundwater quality for the washwater irrigation area. <br /> September 15, 2000 4 Spreckels Tracy <br /> 201M-03eeehwkpin Technical Report and Work Plan <br />