HomeMy WebLinkAbout20163383.tiffAugust 12, 2004
High PIins EnfloeEnng
735 Denver Avenue ° Fort Lupton CO 80G21
Phone 303-857-9280 lax 303-857-9238
Land Professionals, LLC
Attn: Lauren Light
431.1 Highway 66, Suite 4
Longmont, CO 80504
Subject: Consultation - Aggregate Pit Development
12988 WCR 4
Weld County, Colorado
Job No. 04-4123
Lauren:
On July 19, 2004, we visited the subject sit& to obs'er`ve the drilling of four (4) exploratory
holes to evaluate the thickness of the aggregates, which underlay the site, and to obtain
samples for testing. This letter summarizes the results of conditions found in exploratory
test holes and our opinion regarding the viability of the property for recovery of
aggregates.
SITE CONDITIONS
The 15 +1- acre property is known as I2998 WCR 4, which consists of Parcel #1471 31
000088 and Parcel #1471 32 000076, is located south of WCR 4 and east of WCR 27 in
Weld County, CO.
For the most part the topography is gently rolling with slopes of 0.5% to the South to
Southwest.
SUBSURFACE CONDITIONS
During our investigation, a total of four (4) exploratory borings (numbered 3 - 6) were
excavated using a small commercial size drilling rig using 6" diameter bits. We logged
conditions found in each test hole. The site map shows the general location of these holes
with the profile logs graphically representing the conditions found.
At most locations we encountered 0 to 2 feet of silty sand, clay and silty gravel underlain
by sand and gravel of various sizes. The sands and gravels are underlain by clay or shale.
The clay or shale appears to occur at a depth of approximately 35 to 36 feet for the entire
site. Please see the attached soil profile logs.
Samples of the on site materials were obtained at most boring locations at varying depths.
The gradation logs provided summarize the gradation of the "in place" materials
obtained.
The gradation logs provided show gradations for fine to course aggregate with the
samples tested on Number 4, 8, 10, 20, 40, 100 and 200 sieves. There was material larger
than 1-1 inches in diameter and up to 3-1/4 inches in diameter to be removed prior to the
sieve operation. Our scope did not include running physical property testing for quality
on the aggregate.
Our investigation indicates the thickness of the fine aggregate and gravel to vary between
2 and 35 feet. The drilling equipment used was capable of achieving depths in excess of
45 feet.
CONCLUSION
The small size of the lot would dramatically limit the marketability of the gravel
resources for mining. The quantity of gravel available from this 15 +/- acres, assuming
reasonable side slopes, and maintaining legal setbacks from the property lines and
utilities, would likely make this site cost prohibitive to mine. We believe that it is not
economically feasible to mine this site for gravel.
LIMITATIONS
The conclusions presented in this letter were developed based upon conditions disclosed
in exploratory borings and our experience. Should you have any questions regarding this
subsurface exploration, please call 303-857-9280.
Sincerely,
Todd M. Schroeder, PE 3
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SOIL PROFILE #2
SANDY SILT (Owl)
POORLY GRADED GRAVEL (GP)
SILTY GRAVEL (GM)
POORLY GRADED GRAVEL (GP)
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