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r� <br /> � i <br /> City property within the sidewalk. Underground utilities <br /> r4 will be located by Underground Service Alert prior to <br /> commencement of drilling activities. <br /> + r <br /> Drill- <br /> cuttings will be logged continuoual <br /> characterization of contamination and soil t y for <br /> experienced staff Yp�, by an <br /> geologist or civil engineer using- tbp <br /> Unified Soil Classification System. Descriptions of soils <br /> encountered and monitoring well construction details will be <br /> i3 recorded on boring/well log and included within the <br /> assessment report. Soil samples will be collected from the <br /> ,•� boring at five foot intervals, beginning at a depth of five <br /> feet. Samples will also be collected within the saturated <br /> zone for grain size analysis. Samples will also be <br /> reserved for possible laboratory analysis to verify clay <br /> , ' contents or their engineering properties. <br /> All procedures and protocol for groundwater monitoring well <br /> construction will conform to the standards for the <br /> construction and destruction of wells set by SJPHS. The <br /> well will be completed at a depth of approximately 55 feet <br /> below grade. Well completion depth will be based on the <br /> setting of the well screen 15 feet below and 5 feet above <br /> } the saturated zone. However, if 5 continuous feet of clay <br /> are encountered below the point of saturation the well will <br /> ��? be terminated at that depth. Drilling will be conducted <br /> .s under a C57 license using a hollow stem auger drill rig. <br /> The well will be constructed of 2 inch diameter F480 <br /> threaded PVC screen/casing. No glues or solvents will be <br /> + used. Screen slot size will be 0.010 inch. Sand 'Pack <br /> r- material will be #2 pre-washed silica sand. A minimum two <br /> foot bentonite seal will be placed prior to grouting with <br /> neat cement. Cement will be placed in the annulus using the <br /> " tremmie method. <br /> Ll The drill cuttings will be temporarily covered with 6 m11 <br /> plastic on-site until laborato <br /> are received. if <br /> r the soil analysis indicates hydrocarbon contamination the. <br /> material will be treated under theexisting aeration permit. <br /> The soil treatment area will be <br /> Indicating the source of the material, posted with a sign <br /> Groundwater will be monitored in all 8 wells in accordance <br /> with Waterwork's groundwater monitoring protocol (Appendix <br /> II). A survey mark tied to a common ddtum will be <br /> established on each _.-.for establishing the <br /> graundivater .gradient. : Surveying will -be performed by a CA <br /> Registered Civil Engineer. Groundwater contours will be <br /> constructed using a kriging program. <br /> 41 Subsequent to installation and well development, a water <br /> sample will be collected from the monitoring well .8 after <br /> purging a minimum of four well volumes (casing and sand <br /> pack) In addition, water samples will be collected from :the <br /> 5 <br /> i ,iiii,Il ilillil 15!111 111 M1111,11 mellow <br /> 1 <br />