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r1 <br />I, OETd(L IIP;E SUR'rE'!S <br />I' ,Method of Survey <br />' The detail line method is a systematic sampling technique used to <br />characterize rock joint properties (Call, 1972; Savely, 1472; and <br />' Piteau, 1973). Ideally, the sites are randomly selected and the <br />lines have rsndom orientations. <br />I' At the selected mapping site, a tape is stretched along the rock <br />exposure to intersect the greatest number of joints. The tape is <br />' used as a reference line. The mapping zone is parallel to the tape <br />and extends approximately 3 fee*_ above and below the reference line. <br />' The fractures falling within the mapping zone are described using <a <br />standard fOrmdL. A typ1c31 record sheet is shown in Figure 1. Dn <br />this shee*_ the fallowing information is recorded: <br />11 <br />Joint Data (means any type or discontinuity) <br />I' Column 1. ND. The msnber of the discontinuity from the start <br />t of the detailed line survey. <br />2. DIST. Distance along tape where the discontinuities <br />~ or their projections inte n ect the tape. <br />i1 3. TYPE Type of discontinuity. At site includes: <br /> (See also Figure 2) <br />~' B ddi <br />B <br /> = e <br />ng <br /> JS = Joint Set <br />' SJ = Single Joint <br /> DI = Dike <br /> CT = Contact <br /> Ei( = Extremely weathered zone <br />' EA = Extremely altered zone <br /> FL = Foliation <br />' S? = Undefined Surface <br /> <br />