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j T- C <br /> 4 W.W_ ENTERPRISES Consulting Engineering <br /> 2115 9th Street,P.O.Box 1242,Limon,Colorado 80828 (719)775-93I4 <br /> June 27,2011 <br /> Project No. 11-1515 <br /> John and Brenda Higgins <br /> 27451 CR 3H <br /> Genoa,CO 80818 <br /> RE: Gradation results for the samples taken at the proposed gravel pit located in the <br /> NE 1/4 of Section 16,T9S,R55W,Lincoln County,Colorado. <br /> Dear Brenda and John; <br /> This letter is to follow-up our conversations,sampling,and testing of the samples <br /> taken at the above referenced proposed gravel pit location. The samples were taken from <br /> soils borings performed on February 17,2011. Listed below are the test results of the <br /> samples taken. <br /> SIEVE TEST HOLE AND SAMPLE DEPTHS (%PASSING) <br /> 1(3'-4') 1(4'-5') 1(7'-8') 1(8'-9') 2(0'-1') 2(4'-5') <br /> 1 1/2" 100 100 100 100 100 100 <br /> 1" 100 100 100 100 100 100 <br /> 3/4" 100 100 100 100 100 95 <br /> 3/8" 100 95 100 100 100 94 <br /> 4 100 92 96 98 92 82 <br /> 8 99 85 79 93 76 64 <br /> 10 99 83 73 92 70 59 <br /> 40 65 35 20 45 32 25 <br /> 100 15 8 8 16 19 18 <br /> 200 10 5 6 12 16 16 <br /> Plasticity Index(PI) NP NP NP NP NP NP <br /> Natural Moisture(%) 4.2 2.6 2.8 2.8 1.8 5.6 <br /> Soil Classification <br /> AASHTO A-3 (0) A-1-b(0) A-1-b(0) A-1-b(0) A-1-b(0) A-1-b(0) <br /> ASTM SP-SM SP-SM SP-SM SP-SM SM SM <br /> Overburden Depth 3' 3' 3' 3' 0' 0' <br /> CDOT Classification 2,3 2,3,7 2,3,7 2,3 3 3 <br />