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kn KLEINFELDER <br /> Ground water was encountered at 193 feet below ground surface in MW-1 and at 210 feet <br /> below ground surface in MW-2. MW-2 was drilled first so aquifer material from MW-2 <br /> was sieved in the field and the results used for well construction design as discussed in <br /> section 3.3.2. <br /> A ,perched water zone was encountered in MW-1. Water was present between <br /> approximately 120 and 140 feet. This perched zone may be due to the presence of a small <br /> reservoir and creek in the vicinity of MW-1, or it may have represented the collection of <br /> precipitation. Due to the relative shallowness of the water and the poor production of the <br /> perched aquifer encountered at MW-1 it appeared that the encountered water was not the <br /> same aquifer as screened by MW-2. Drilling, therefore, continued until a producing <br /> aquifer was encountered. <br /> 3.3.2 Filter Pack And Well-screen Design <br /> The monitoring well screen slot size and filter pack type were selected in accordance with <br /> the guidelines outlined in the California Department of Health Services Decision Tree <br /> Manual and the National Water Well Association guidelines. <br /> A representative sampling of the water bearing strata in MW-2 was obtained for a sieve <br /> analysis. The sieve analysis was conducted onsite after drying the material overnight. The <br /> sieve analysis results are included in Appendix C. Based on the results of the field sieve <br /> analysis, a screen slot size of 0.02 inches and a#2/12 filter pack were selected. <br /> 3.3.3 Monitoring Well Construction <br /> Monitoring wells were constructed following protocol outlined in Appendix A, with <br /> differences from the field protocol noted below. <br /> Owing to the availability of materials, the depth of the wells, and the diameter of the <br /> dedicated pumps to be installed, 5-inch diameter, schedule 80 PVC flush threaded joint <br /> casings were used to construct each well. <br /> - screened interval. The <br /> in h lot sc ee <br /> Both wells were constructed with a 20 foot section of 0.02-inch s <br /> bottom of MW-1 is set at 210 feet and the bottom MW-2 is set at 225 feet (for detailed <br /> boring construction logs, see Appendix B). The well casing was lowered into the bore hole <br /> FOOTHILL 19 <br />