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EXHIBIT A - <br />- MINIMUM REQUIREMENTS fOR NUMBER AND SPACING <br />- - OF PITS AND BORINGS FOR SAMPLING SOILS AND ROCK - <br />Number and sparing of Level 2 sampling pits or borings and Leve13 test borings should- conform to the following <br />guidelines. For Level 3, the Qeotedtnical Engineer will select the locations of borings and the type, frequency, and depth <br />of samples and/or field- strength tests. - <br /> Guidelines for Spacing of Borings <br /> Maximum distance between borings, feet <br /> Proled Horizontal stratification of soil or rods Minimum number of borings <br /> Uniform Average Non-uniform <br /> Mufti-story buildings ~' 150 1'00 50 4 per structure <br /> One or two-story buildings 200 100 50 3 per structure <br /> Land diviswns, development site <br /> 4 or less acres 500 200 100 - 3 per acre <br /> Land divisions, development site 7 <br /> <br />4 or more acres 500 200 900 2 <br />per site + 3 per unit <br />Bridge piers;~abutmerrts, - <br />' 100 100 25 - 1- 2 for each foundation <br />~levision towers, etc. - unit <br />Roadways, sewers,:pipelines 1000 - 500 200 -100 <br />Borrow pits <br /> <br />(for compacted fill) 500 200 100 - 50 <br />Earth dams, dikes 200 100 50 <br /> Space preliminary borings 200 to 500 feet apart so that the area between any four <br />New site of wide extent . borings indudes approximately 10% of the total area. In detailed exploration, add <br />. borings to establish. geological sections at the most useful orien#ation. <br />Development of site :on soft Space borings 100 #0 200 feet at.possible building locations. Add intermediate <br />compressible strata borings when building site is determined. <br />Lev-load warehouse building or Minimum of 4 borings at comers plus intermediate borings at interior foundations <br />large area suffident to define subsoil profile. <br />Slope stability, deep cuts, high Provide 3 to 5 borings on line in the critical diredaon to provide geological section <br />embankments for analysis. Number of geological sections depends on extent of stability problem. <br /> For active slide, place at least one boring up slope of sliding area. <br />Page 1 of 2 <br />