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• <br />1100 Simms Street <br />Lakewood. Colorado <br />Phone 1303) 233 8155 <br />Paae 4 <br />EARTH <br />AIR Mailing Address: <br />1100 Simms Street <br />Golden, Colorado 80401 <br />NATURAL RESOURCES LABORATORY, INC. <br />~J <br />Sand <br />~ ~ ~ <br />Sand, Silt. Clav <br />Particle size analysis by wet sieving and weighing <br />of residue. Dispersed sample residue fromkydro- <br />meter analysis sieved through 270 mesh (0.0530 <br />sieve. This was chosen as closest apgrozimation <br />on standard commercially available sieves to II.S.D,A. <br />size classification of very fine sand as 0.10-0.OSmm. <br />All material +270 mesh report ae sand, calculated as <br />weight percentages of total fine material (~ 2mm) <br />present. It should also be noted that overburden <br />core samples were mechanically pulverized to -10 <br />mesh grior to analyeiei this pulverization may <br />alter to some ertent distribution of particles <br />within a particular sample. (ref: Modification of <br />A.S.A. Mono. No. 9, Part 1, method 43.3.3, p. 555) <br />Particle size analysis from hydrometer data, each <br />fraction greeent reported ae weight percentage of <br />total fine material (gmm) gresent, It should be <br />noted that the hydrometer method employed is eub,ject <br />to error as pertiole densities vary significantly <br />from 2,651 this will affect in particular those <br />samples with ezoeseive difficult to ozidize organic <br />matter, such se coal seams. (ref: Modification <br />of A.S.A. Morro. No. 9, Part 1, method 43•Sr <br />pp. 562-566.) <br />a-r~c <br />insufficient sample material received to perform all analyses oa this <br />particular interval <br />f-.J <br />ANALYTICAL SERVICES AND RESEARCH <br />-44- <br />WATER <br />