EGBA - IFB 2019-0012 - Twin Mountain Replacement (4 of 4).pdf
PDF 596 KB Posted
- Attached to
- EGBA-FY19-RFP for the Twin Tower
- Solicitation number
- IFB1 EGBA 2019000012 2
- Issued by
- Garfield County, Denver City, Colorado
About this file
This is a geotechnical engineering study report prepared by Kumar & Associates, Inc. for a communication tower replacement project in Fremont County, Colorado, specifically at the top of Twin Mountain (South Twin Mountain). The project involves the design and construction of a communication tower with associated foundations and anchoring systems. The study was conducted in accordance with Proposal No. C17-306, dated November 28, 2017, to develop foundation recommendations for the proposed structure. The scope of work included site reconnaissance and subsurface investigation through one exploratory boring to determine appropriate foundation design parameters and construction considerations for the tower installation.
The geotechnical investigation revealed subsurface conditions consisting of approximately 2 feet of silty sand overburden underlain by 1.5 feet of weathered granitic bedrock and extending to unweathered granitic bedrock at the maximum explored depth of 12 feet. Groundwater was not encountered during drilling, though fluctuations are expected seasonally. The report recommends the tower be supported on a spread footing or mat foundation bearing on undisturbed, unweathered bedrock with an allowable bearing pressure of 10,000 psf, or alternatively using grout-bonded rock anchors for uplift resistance. For the anticipated loading conditions (105 kips uplift per anchor with a four-anchor array at each leg), rock anchor embedment is recommended at 18.5 feet minimum bond length assuming 3-inch diameter anchors. The report provides detailed design parameters, excavation considerations classified as OSHA Type B and C materials, surface drainage requirements, and specifies that Kumar & Associates should be retained for design review and construction observation services to ensure compliance with recommendations.
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Text version
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W e re co m m en d a so il un it w ei gh t o f 1 p cf b e as su m ed f or c om pa ct ed f ill co ns is tin g of m oi st ur e-co nd iti on ed o n-si te s oi ls o r no n-ex pa ns iv e im po rte d so il m at er ia ls a ss um in g th ey a re c om pa ct ed to a t l ea st
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Th e ca pa ci ty o f th e gr ou t, th e st ee l r ei nf or ce m en t an d th e bo nd s tre ng th b et w ee n th e st ee l re in fo rc em en t an d th e gr ou t sh ou ld b e ve rif ie d by t he p ro je ct s tru ct ur al e ng in ee r.
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T he r eq ui re d le ng ul d po te nt ia lly b e re du ce d if su pp or te d by lo ad te st in g da ta . K um ar a nd
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Ba se d on th e la bo ra to ry d at a an d ou r e xp er ie nc e, w e be lie ve s pe ci su lfa te re si st an t c em en t w ill no t b e re qu ire d fo r c on cr et e ex po se d to th e on -s ite s oi ls
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Ex ss iv e w et tin g or d ry in g of t he f ou nd at io n su bg ra de s sh ou ld b e av oi de d du rin g co ns tru ct io gr ou nd s ur fa ce s ur ro un di ng th e ex te rio r o f t he to w er fo un da tio n sh ou ld b e sl op ai n aw ay fr om th e fo un da tio n in a ll di re ct io ns
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A m in im um s lo pe o f in ch es in th e fir st fe et is re co m m en de d in th e pa ve d ar ea
Po in g of w at er s ho ul d no t be a llo w ed o n ba ck fil l m at er ia l or w ith in fe et o f th e fo un da tio n w al ls
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P ne um at ic a nd /o r h yd ra ul ic h am m er s, ro ck d ril lin g or b la st in g m ay b e re qu ire d to e xc av at e th e in ta ct b ed ro ck
L ar ge f ra gm en ts o f be dr oc k m ay b e en co un te re d du rin g ex ca va tio n.
A ll ex ca va tio ns s ho ul d be in a cc or da nc e w ith
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A gu id el in es th e na tiv e ov er bu rd en s oi ls w ill lik el y cl as si fy a s a Ty pe C m at er ia l.
Th e be dr oc k m at er ia l w ill lik el y cl as si fy a s a
Ty pe
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If at er ia ls d iff er en t f ro m th os e in di ca te r ep or t ar e en co un te re d, t he
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S ho rin g w ill be r eq ui re d w ex ca va te d sl op es c an no t be a cc om m od at ed
G ro un dw at er w as n ot e nc ou nt er ed d ur in g th e su bs ur st ig at io no an tic ip du rin g co ns tru ct gr nd w un te re d, f la tte r sl op es w ill be r eq ui re d.
I t is a ss um ed s ite d ew at er in g w ou ld o cc ur i n ad va nc e of th e ex ca va tio n, a nd b e m ai nt ai ne d th e en tir e du ra tio n th at th e ex ca va tio n is o
Su rfa ce d ra in ag e sh ou ld b e di ve rte d aw ay fr om a ll te m po ra ry c ut s lo pe s in o rd er to re du ce th e po te nt ia l f or s lo pe e ro si on a nd in st ab ilit y.
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A re gu la tio ns r eq ui re th at e xc av at io ns g re fe et in d ep th a nd e xc av at io ns th at e xt en d be lo w th e gr ou nd w at er le ve l b e de si gn ed b y a pr of es si on al e ng in ee r.
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s ho ul d be r et ai ne d to r ev ie w th e pr oj ec t p la ns a nd s pe ci fic at io ns fo r co nf or m an ce w ith th e re co m m en da tio ns p ro vi de d in th is re po rt.
W e ar e al so a va ila bl e to a ss is t th e de si gn t ea m i n pr ep ar in g sp ec ifi ca tio ns f or g eo te ch ni ca l as pe ct s of t he p ro je ct a nd if ne ce ss y, rm tio na l st ud ie s m m od at e an y ch an ge pr op tru ct re co m m en d th at
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b e re ta in ed to p ro vi de c on st ru ct io n ob se rv at io n an d te st in g se rv ic es to d oc um en t t ha t t he in te nt o f t hi s re po rt an d th e re qu ire m en ts o f t he p la sp ec ifi ca tio ns a re b ei ng fo llo w ed d ur in g co ns tru ct io n.
T hi s w ill al lo w u s to id en tif y po ss ib va ria tio ns in s ub su rfa ce c on di tio ns fr om th os e en co un te re d du rin g th is s tu dy a nd to a llo w u
-e va lu at e ou r r ec om m en da tio ns , i f n ee de d.
W e w ill no t b e re sp on si bl e fo r i m pl em en ta tio re co m m en da tio ns p re se nt ed i n th is r ep or t by o th er s, i f w e ar e no t re ta in ed t o pr ov id e co ns tru ct io n ob se rv at io n an d te st in g se rv ic
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S ud y ha s uc te rd ra lly pt ot ec hn ne er in g pr ac tic es in th is a re a fo r us e by th e cl ie nt fo r de si gn p ur po co nc lu si on s an d re co m m en da tio ns s ub m itt ed i n th is r ep or t ar e ba se d up on t he d at a ob ta in ed f ro m ex pl or at or y bo rin g at t he lo ca tio n in di ca te d on
F ig an d th e pr op os ed t yp e of c on st ru ct r ep or t m ay n ot r ef le ct s ub su rfa ce v ar ia tio ns t ha t oc cu r, an d th e na tu re a nd e xt en va ria tio ns a cr os s th e si te m ay n ot b ec om e ev id en t un til s ite g ra di ng a nd e xc av at io ns rm ed
If du rin g co ns tru ct io n, fi ll, s oi l, ro ck o r w at er c on di tio ns a pp ea r t o be d iff er en t f e de sc rib ed h er ei n, K um ar
A ss oc ia te s, I nc sh ou ld b e ad vi se d at o nc e so t ha t a re ev al ua tio n of th e re co m m en da tio ns p re se nt ed in th is re po rt ca n be m ad e.
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A ss oc ia s, In is n ot re sp on si bl e fo r l ia bi lit y as so ci at ed w ith in te rp re ta tio n of s ub su rfa ce d at a by o th sc op e of s er vi ce s fo r th is p ro je ct d oe s no t i nc lu de a ny e nv iro nm en ta l a ss es sm en t o o r id en tif ic at io n of c on ta m in at ed o r ha za rd ou s m at er ia ls o r co nd iti
If e ow ne r nc er ne d ab ou t t he p ot en tia l f or s uc h co nt am in at io n, o th er s tu di es s ho ul d be u nd er ta ke
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