Laserfiche WebLink
<br />~.~~a:~~ <br />~~ <br />The following construction procedures were generally <br />used for all nine piezometer wells. Figure 3-3 displays general <br />well construction features. Variations from these procedures <br />are noted in this section and are included in Section 3.3 which <br />describes each well individually. <br />Table 3-1 summarizes significant well construction <br />data for each piezometer well. <br />3.2.1 Surface Well Casing <br />Surface well casing was installed as necessary for <br />each well. Steel casing, 10-inch inside diameter, was installed <br />in holes drilled with a 12-3/4 inch bit. The steel surface cas- <br />ing was not cemented in place. <br />• 3.2.2 Drilling, Sampling of Dri11 Cuttings, and <br />Geophysical Longing <br />We11s were rotary-drilled to the depth of interest <br />with bits ranging from 7-3/8 to 8-3/4 inches. The lower sections <br />of all boreholes (:where cement baskets were installed) were dril- <br />led with bits no larger than 7-7/8 inches. Six drill collars <br />were used to insure a straight borehole. Drilling fluids used <br />were air, water, soap, and bentonite mud. <br />At each of the three sites, the deepest well was com- <br />pleted first. Drill cuttings were collected and logged from <br />those first wells as necessary, generally every 10 feet. <br />After reaching the depth of interest, the first hole <br />was geophysically logged. All geophysical logging was done by <br />Bill Savage of Savage Scientific, Inc., Craig, Colorado. Point <br />• resistivity, natural gamma, and gamma-gamma (density) logs were <br />3-4 <br />