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<br />1.4.2 Mapping <br />Field mapping of soils for the undisturbed portion of <br />the pad area was done directly on high quality black and <br />white aerial photos of 1" = 1,667' scale. High intensity <br />mapping was employed with delineations as small as two acres <br />where necessary. Vegetation, topographic landmarks, and <br />numerous spade and auger holes were used to determine mapping <br />unit boundaries. Constant reference was made to available <br />SCS soil series descriptions and ranges of characteristics <br />to maintain a high degree of correlation with properties <br />of the soils. <br />1.4.3 Mapping Unit Design <br /> <br />Survey techniques were designed to ensure that mapping <br />unit design was compatible to the needs and uses 'of the <br />survey. A mapping unit in this survey is comprised of: <br />t <br />1) A single soil series phase or phase of series variant. <br />2) A complex of soil series phases. <br />3) An association of soil series phases. <br />The majority of mapping units are a single soil type, either <br />series phase or phase of series variant with less than 15 <br />percent inclusions of other soil and/or land type. <br />L~ <br />-6- <br />