August 8, La Plata Archuleta Water District c/o Harris Water Engeerg, P.E. 9 East nd Avenue, Suite Durango, Colorado 8 brett@durangowater.com Subject: Geotechnical Engeerg Subsurface Exploration The Proposed Ma Water Le Durango, Colorado PN: GE Mr. Sherman, This letter presents our test bore logs from our field exploration for the Ma Water Le along the east and north side of County Road between the tersections of La Plata County Road and La Plata County Road A. The figure below shows the approximate locations of our test borgs, and where potential shallow formational material may be encountered durg the water le trench excavation. The logs of our test borgs are attached to this letter. We encountered formational material Test Borgs Three, Five, Eight, and Ne Phase E at depths that ranged from one () to two and one-half ( /) below the existg ground surface. The formational material encountered Test Borg Three was consisted of hard claystone material. The formational material encountered Test Borg Eight and Ne consisted of very hard sandstone material. We encountered extremely weathered claystone material Test Borg Five at one () foot below the ground surface. In addition to the test borgs, we observed formational material adjacent to the roadway and the proposed waterle alignment locations depicted on the attached figure. In the remag test borgs, we encountered sandy clay soil with few gravels and cobbles to the bottom of the test borgs at depths that ranged from four () to eight (8). We anticipate that the weathered formational material can be excavated with conventional excavation equipment, but may require substantial effort some areas or where competent formational material is encountered. Please contact us if you have any questions, or if we may be of additional service. Respectfully, TRAUTNER GEOTECH Tom R. Harrison, P.E.
August 8, Page Potential Shallow Formational Material and Test Borg Map for LAPLAWD PHASE E. TB-7 TB- TB-9 TB-8 TB-6 TB- TB- TB- LEGEND Potential Shallow Formational Material TB- Test Borg TB-
Field Engeer Hole Diameter Drillg Method : T. Harrison : " Solid : Contuous Flight Auger LOG OF BORING TB- Samplg Method : Date Drilled : 8/6/ Total (approx.) : : See Figure Letter Harris Water Engeerg Sample Type Durg Drillg After Drillg AY, sandy, few gravels, few cobbles, stiff, slightly moist 8-9- T:\Current GE\GE, LAPLAWD Phase D\Logs of Test Borgs\LAPLAWD Phase D TB-.bor Bottom of test borg at four ()
Field Engeer Hole Diameter Drillg Method : T. Harrison : " Solid : Contuous Flight Auger LOG OF BORING TB- Samplg Method : Date Drilled : 8/6/ Total (approx.) : : See Figure Letter Harris Water Engeerg Sample Type Durg Drillg After Drillg AY, sandy, few gravels, few cobbles, stiff, slightly moist 8-9- T:\Current GE\GE, LAPLAWD Phase D\Logs of Test Borgs\LAPLAWD Phase D TB-.bor Bottom of test borg at four ()
Field Engeer Hole Diameter Drillg Method : T. Harrison : " Solid : Contuous Flight Auger LOG OF BORING TB- Samplg Method : Date Drilled : 8/6/ Total (approx.) :. : See Figure Letter Harris Water Engeerg Sample Type Durg Drillg After Drillg AY, sandy, few gravels, few cobbles, stiff, slightly moist 8-9- T:\Current GE\PE, \Logs of Test Borgs\ TB-.bor Formational material, claystone, hard, slightly moist, tan Bottom of test borg at four and one-half (.) /6 /6
Field Engeer Hole Diameter Drillg Method : T. Harrison : " Solid : Contuous Flight Auger LOG OF BORING TB- Samplg Method : Date Drilled : 8/6/ Total (approx.) : : See Figure Letter Harris Water Engeerg Sample Type Durg Drillg After Drillg AY, sandy, few gravels, few cobbles, stiff, slightly moist 8-9- T:\Current GE\GE, LAPLAWD Phase D\Logs of Test Borgs\LAPLAWD Phase D TB-.bor Bottom of test borg at four ()
Sample Type Field Engeer : T. Harrison Hole Diameter : " Solid Drillg Method : Contuous Flight Auger Samplg Method : Date Drilled : 8/6/ Total (approx.) : : See Figure Letter Durg Drillg LOG OF BORING TB- Harris Water Engeerg After Drillg AY, sandy, few gravels, few cobbles, stiff, slightly moist Weathered Formational material, clay and claystone, hard, slightly moist, tan 8-9- T:\Current GE\PE, \Logs of Test Borgs\ TB-.bor Bottom of test borg at four ()
Sample Type Field Engeer : T. Harrison Hole Diameter : " Solid Drillg Method : Contuous Flight Auger Samplg Method : Date Drilled : 8/6/ Total (approx.) : 8 : See Figure Letter Durg Drillg LOG OF BORING TB-6 Harris Water Engeerg After Drillg AY, sandy, few gravels, few cobbles, stiff, slightly moist 8-9- T:\Current GE\PE, \Logs of Test Borgs\ TB-6.bor 6 7 8 9 Bottom of test borg at eight (8)
Field Engeer Hole Diameter Drillg Method : T. Harrison : " Solid : Contuous Flight Auger LOG OF BORING TB-7 Samplg Method : Date Drilled : 8/6/ Total (approx.) : : See Figure Letter Harris Water Engeerg Sample Type Durg Drillg After Drillg AY, sandy, few gravels, few cobbles, stiff, slightly moist 8-9- T:\Current GE\PE, \Logs of Test Borgs\ TB-7.bor Bottom of test borg at four ()
Sample Type Field Engeer : T. Harrison Hole Diameter : " Solid Drillg Method : Contuous Flight Auger Samplg Method : Date Drilled : 8/6/ Total (approx.) : : See Figure Letter Durg Drillg LOG OF BORING TB-8 Harris Water Engeerg After Drillg AY, sandy, few gravels, few cobbles, stiff, slightly moist Formational material, sandstone, very hard, slightly moist, tan 8-9- T:\Current GE\PE, \Logs of Test Borgs\ TB-.bor Bottom of test borg at four () SS /
Sample Type Field Engeer : T. Harrison Hole Diameter : " Solid Drillg Method : Contuous Flight Auger Samplg Method : Date Drilled : 8/6/ Total (approx.) : : See Figure Letter Durg Drillg LOG OF BORING TB-9 Harris Water Engeerg After Drillg AY, sandy, few gravels, few cobbles, stiff, slightly moist 8-9- T:\Current GE\PE, \Logs of Test Borgs\ TB-.bor Formational material, sandstone, very hard, slightly moist, tan Bottom of test borg at four () SS /
Field Engeer Hole Diameter Drillg Method : T. Harrison : " Solid : Contuous Flight Auger LOG OF BORING TB- Samplg Method : Date Drilled : 8/6/ Total (approx.) : : See Figure Letter Harris Water Engeerg Sample Type Durg Drillg After Drillg AY, sandy, few gravels, few cobbles, stiff, slightly moist 8-9- T:\Current GE\PE, \Logs of Test Borgs\ TB-7.bor Bottom of test borg at four ()