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HomeMy WebLinkAbout20040766 Ver 3_401 Application_20080102TRUE LINE SOILS, INC. ,r~ i~ ~,r ,2/3~Jp~ ~ s~~~-A~ G~.Iv-er-~- ~ -~ s-~° i ~~ ~ ik~ ~ ~ ~~~~~ _ °~ c~- ~:-~ ~ ~~~~ . ~~ ~~ ~' 5~~~~ ~~~ ~ ~{ -o1te~ Y3 205 W. Main Street, Clayton, NC 27520 (919) 359-0427 • Fax: (919) 359-0428 ~ ~® ~~. b~,r ~ ~~~ ~~ °`~~~ ~,~ D 0 ~N P a p SK ~~ P~K ,~ p~ 1 C J~ ~, e,210s ~ ..~ .Y Office Use Only' Form Version Mazch OS USACE Action ID No. DWQ No. ~ ~" ~ 1 L to V3 I'__Ll_11 __/IAT/All \ (If any particular Item ~s not appucadte co cols pro~eci, pteasc oincT Two f>L~J~IU\.atr.~. ~~ ~ ~l • ~ ~~ I. Processing l . Check all of the approval(s) requested for this project: ^ Section 404 Permit Riparian or Watershed Buffer Rules ^ Section 10 Permit ~ Isolated Wetland Permit from DWQ 401 Water Quality Certification ^ Express 401 Water Quality Certification 2. Nationwide, Regional or General Permit Number(s) Requested: 3. if this notification is solely a courtesy copy because written approval for the 401 Certification is not required, check here: ^ 4. If payment into the North Carolina Ecosystem Enhancement Program (NCEEP) is proposed for mitigation of impacts, attach the acceptance letter from NCEEP, complete section VIII, and check here: ^ II. 5. [f your project is located in any of North Carolina's twenty coastal counties (listed on page 4), and the project is within a North Carolina Division of Coastal Management Area of Environmental Concern (see the top of page 2 for further details), check here: ^ ~~?~D Applicant Information D ~~"~~;~ `~:~-~'~' 1. Owner/Applicant Information ~~~ ~ 2008 Name: `-' ~ ~r` • ~ .~. _ , '`' it Mailing Address -1~'. ~ f~\~~~ ~ ~n~ci ~,~z n~',;s ``~5=r~~+~A~ _...,h.~ Telephone Number: i ~i ~_~~-(~.a - ~?' f 3 Fax Number: E-mail Address: 2. Agent/Consultant Information (A signed and dated copy of the Agent Authorization letter must be a ched if e Agent has signatory authority for the owner/applicant.) Name: ~ ~e a ~ r ' ' ~ Company Affiliation: j r~~~ ~~~e ~n~ 1 ~~c Mailing Address: ~S ~. fv~~_c ~~ . _ _ Telephone Number: ~ ~ i ~ ~ ~~ ~-f 3-01- - ~ ~`(S Fax Number: E-mail Address: dl ~ rx<<a~ r ; ~.-~~ ~ e~ ~}t' ~ ~ `~;~•~1t~+ Page 5 of 12 .y III. Project Information Attach a vicinity map clearly showing the location of the property with respect to local landmarks such as towns, rivers, and roads. Also provide a detailed site plan showing property boundaries and development plans in relation to surrounding properties. Both the vicinity map and site plan must include a scale and north arrow. The specific footprints of all buildings, impervious surfaces, or other facilities must be included. If possible, the maps and plans should include the appropriate USGS Topographic Quad Map and NRCS Soil Survey with the property boundaries outlined. Plan drawings, or other maps may be included at the applicant's discretion, so long as the property is clearly defined. For administrative and distribution purposes, the USACE requires information to be submitted on sheets no larger than 11 by 17-inch format; however, DWQ may accept paperwork of any size. DWQ prefers full-size construction drawings rather than a sequential sheet version of the full-size plans. If full-size plans are reduced to a small scale such that the final version is illegible, the applicant will be informed that the project has been placed on hold until decipherable maps are provided. ~ f i 1. Name of project: ....~.~; .~'~~ ~ ! ~ ~~- S1 ~;~ ~~ i ~ w~~ ~~~~;~ ~ ~~~ 2. T.LP. Project Number or State Project Number (NCDOT Only): ~ t~ # `L~~.~' 3. Property Identification Number (Tax PIN): ~ ~~~ -'`i • °~ ~ ~_ 4. Location County: ~~~~'rW ~'~~. Nearest Town: C~ a-~ -4-~sn Subdivision name (include phase/lot number): ~'' r~ ~F ~ ~ ~.~ ~~~~~- Directions to site (include road numbers/names, landmarks, etc.): `~~'~ - ~.,~, ~~r ~~° ^ ~~ ~-'u~' ~- , , ~ ~ ~~ II u ~;~. J 5. Site coordinates (For linear projects, such as a road or utility line, attach a sheet that separately lists the coordinates for each crossing of a distinct waterbody.) Decimal Degrees (6 digits minimum): °N oW 6. Property size (acres): ~ ~' ` ~ 0.c. ; ~ ~ ~`~e ~ ~-`~ c i- ~ ~} i~r ., ~` ~ ~ ~ ~ f 7. Name of nearest receiving body of water: ` a~'~~~i F~~.`-~ c~~ 8. River Basin: N~~ Se- (Note -this must be one of North Carolina's seventeen designated major river basins. The River Basin map is available at http-//h2o enr.state.nc.us/admin/maps/.) 9. Describe the existing conditions on the site and general land use in the vicinity of the project ,t at the time of this application: ~_ ~ ~~` _~~ ~~-~ '~ ~ 4 )~~~Cl `• ~.~ t~ '$ ~~~ ~ ~-~~-~ `=~`` ~ a ~ ~Cv ~~-~r~~ fa~~.c~ Page 6 of 12 0. Describe the overall project in detail, including the I `~i`-~o i , ln. ~ i r°~ r>~t~_ ~~,~~t J f~~'t"_-r'Jv,+t, ~ ~ of equipment to be used: .,~ i_i_ i ~ ~.l__ 1 I. Explain the purpose of the proposed work: ~`~~ ~,n ~ ~ ~"~>; ~ <" ~ ~`" ~~~~~'~ IV. Prior Project History If jurisdictional determinations and/or permits have been requested and/or obtained for this project (including all prior phases of the same subdivision) in the past, please explain. Include the USACE Action ID Number, DWQ Project Number, application date, and date permits and certifications were issued or withdrawn. Provide photocopies of previously issued permits, certifications or other useful information. Describe previously approved wetland, stream and buffer impacts, along with associated mitigation (where applicable). If this is a NCDOT project, list and describe permits issued for prior segments of the same T.I.P. project, along with construction schedules. ! `~ i`z ~i ~^~ ~ ~~ ~ ~ (~.Q, r~.,;~\ ~ t~ t~ off- - 2~7 ~~„ ~l~ r' 2 V. Future Project Plans Are any future permit requests anticipated for this project? If so, describe the anticipated work, and provide justification for the exclusion of this work from the current application. n. VI. Proposed Impacts to Waters of the United States/Waters of the State It is the applicant's (or agent's) responsibility to determine, delineate and map all impacts to wetlands, open water, and stream channels associated with the project. Each impact must be listed separately in the tables below (e.g., culvert installation should be listed separately from riprap dissipater pads). Be sure to indicate if an impact is temporary. All proposed impacts, permanent and temporary, must be listed, and must be labeled and clearly identifiable on an accompanying site plan. All wetlands and waters, and all streams (intermittent and perennial) should be shown on a delineation map, whether or not impacts are proposed to these systems. Wetland and stream evaluation and delineation forms should be included as appropriate. Photographs may be included at the applicant's discretion. If this proposed impact is strictly for wetland or stream mitigation, list and describe the impact in Section VIII below. If additional space is needed for listing or description, please attach a separate sheet. 1. Provide a written description of the prop~o/sed impacts: ~U ~-'~~ C' l M i ~ c ~S ~-"t~ ~` ~s~`,.,n i-4tx \.i i ~,:. ~_'~.F"JC -{4-i ~i~J'~.. 1 Y© ~'.~-l~V\G. ~--~ iVVLDO~~.~-<. C-a, '~s t ~ t (.lQ~..1~=!'~ Page 7 of 12 2. Individually list wetland impacts. Types of impacts include, but are not limited to mechanized clearing, grading, fill, excavation, flooding, ditching/drainage, etc. For dams, t 1 list im acts due to both structure and flooding. se ara Wetland Impact Site Number (indicate on map) e y Type of Impact T e of Wetland yp (e.g., forested, marsh, herbaceous, bog, etc.) Located within 100-year Floodplain (es/no) Distance to Nearest Stream (linear feet) Area of Impact (acres) Total Wetland Impact (acres) ~~,~ ~ SS 3. List the total acreage (estimated) of all existing wetlands on the property: N S-~c.~~ 4. Individually list all intermittent and perennial stream impacts. Be sure to identify temporary impacts. Stream impacts include, but are not limited to placement of fill or culverts, dam construction, flooding, relocation, stabilization activities (e.g., cement walls, rip-rap, crib walls, gabions, etc.), excavation, ditching/straightening, etc. If stream relocation is proposed, plans and profiles showing the linear footprint for both the original and relocated streams r..r~ct hn inrlnrlail Tn ~-.al~.nlatP arreaae_ multiply length X width, then divide by 43,560. .....~~ ~ Stream Impact Number indicate on ma .. ............... _ -- Stream Name -- -----a-~ -- Type of Impact ~ ~ Perennial or Intermittent? - Average Stream Width Before Im act - Impact Length linear feet Area of Impact acres Total Stream Impact (by length and acreage) - ~,~ 5. Individually list all open water impacts (including lakes, ponds, estuaries, sounds, Atlantic Ocean and any other water of the U.S.). Open water impacts include, but are not limited to f;il A....~~,~t;..,, rlrar~aina flnnrlina rlrainane_ bulkheads. etC. ~..., .,,.., Open Water Impact Site Number indicate on map) w ...«.,.., ... _.. --- ~ -_-- -- Name of Waterbody (if applicable) ---- -- --- T e of Im act yp p , Type of Waterbody lake, ond, estu sound, ba , ( p ~' y ocean, etc.) Area of Im act p (acres) Total Open Water Impact (acres) Page 8 of 12 6. List the cumulative im act to all Waters of the U.S. resulting from the project: Stream Impact (acres): Wetland Impact (acres): O en Water Im act (acres): Total Impact to Waters of the U.S. (acres) Total Stream Im act (linear feet): ~ lO - D1,J~ jpl}. _o~6G V~.et Z ~4r-,s~{,~~ 7. Isolated Waters ~; ( Z-7~ 7~7 Do any isolated waters exist on the property? ^ Yes ~ No Describe all impacts to isolated waters, and include the type of water (wetland or stream) and the size of the proposed impact (acres or linear feet). Please note that this section only applies to waters that have specifically been determined to be isolated by the USACE. Pond Creation If construction of a pond is proposed, associated wetland and stream impacts should be included above in the wetland and stream impact sections. Also, the proposed pond should be described here and illustrated on any maps included with this application. Pond to be created in (check all that apply): ^ uplands ^ stream ^ wetlands Describe the method of construction (e.g., dam/embankment, excavation, installation of draw-down valve or spillway, etc.): Proposed use or purpose of pond (e.g., livestock watering, irrigation, aesthetic, trout pond, local stormwater requirement, etc.): Current land use in the vicinity of the pond: Size of watershed draining to pond: Expected pond surface area: VII. Impact Justification (Avoidance and Minimization) Specifically describe measures taken to avoid the proposed impacts. It may be useful to provide information related to site constraints such as topography, building ordinances, accessibility, and financial viability of the project. The applicant may attach drawings of alternative, lower-impact site layouts, and explain why these design options were not feasible. Also discuss how impacts were minimized once the desired site plan was developed. If applicable, discuss construction techniques to be followed during construction to reduce impact` ~,~~~ ~#a^ -.~ '~?.._ .. ( ~t a`_u ,~. ,-.. 4ehnr-ea. ('k,~ ~ ~ 1 $~5~, _ .,~ r. t~ 1~~t~ s _ i~.~~'`ri~,o"~`;. ~A ._.. _ (~... ~. ~.~r... ::L,~ f,V~ntA -_lrw ('I3 (`i C- _`~'";~~e.=1. ~-~.:~~'C'~FrS,A.~- ~O 55 ~~ VIII. Mitigation 1 DWQ - In accordance with 15A NCAC 2H .0500, mitigation may be required by the NC Division of Water Quality for projects involving greater than or equal to one acre of impacts to freshwater wetlands or greater than or equal to 150 linear feet of total impacts to perennial streams. Page 9 of 12 USACE - In accordance with the Final Notice of Issuance and Modification of Nationwide Permits, published in the Federal Register on January 15, 2002, mitigation will be required when necessary to ensure that adverse effects to the aquatic environment are minimal. Factors including size and type of proposed impact and function and relative value of the impacted aquatic resource will be considered in determining acceptability of appropriate and practicable mitigation as proposed. Examples of mitigation that may be appropriate and practicable include, but are not limited to: reducing the size of the project; establishing and maintaining wetland and/or upland vegetated buffers to protect open waters such as streams; and replacing losses of aquatic resource functions and values by creating, restoring, enhancing, or preserving similar functions and values, preferable in the same watershed. If mitigation is required for this project, a copy of the mitigation plan must be attached in order for USACE or DWQ to consider the application complete for processing. Any application lacking a required mitigation plan or NCEEP concurrence shall be placed on hold as incomplete. An applicant may also choose to review the current guidelines for stream restoration in DWQ's Draft Technical Guide for Stream Work in North Carolina, available at http•//h2o enr state nc.us/ncwetlands/strm~ide.html. l . Provide a brief description of the proposed mitigation plan. The description should provide as much information as possible, including, but not limited to: site location (attach directions and/or map, if offsite), affected stream and river basin, type and amount (acreage/linear feet) of mitigation proposed (restoration, enhancement, creation, or preservation), a plan view, preservation mechanism (e.g., deed restrictions, conservation easement, etc.), and a description of the current site conditions and proposed method of construction. Please attach a separate sheet if more space is needed. 2. Mitigation may also be made by payment into the North Carolina Ecosystem Enhancement Program (NCEEP). Please note it is the applicant's responsibility to contact the NCEEP at (919) 715-0476 to determine availability, and written approval from the NCEEP indicating that they are will to accept payment for the mitigation must be attached to this form. For additional information regarding the application process for the NCEEP, check the NCEEP website at http•//h2o.enr.state.nc.us/wrp/index.htm. If use of the NCEEP is proposed, please check the appropriate box on page five and provide the following information: Amount of stream mitigation requested (linear feet): Amount of buffer mitigation requested (square feet): Amount of Riparian wetland mitigation requested (acres): Amount ofNon-riparian wetland mitigation requested (acres): Amount of Coastal wetland mitigation requested (acres): Page 10 of 12 IX. Environmental Documentation (required by DWQ) 1. Does the project involve an expenditure of public (federaVstate/local) funds or the use of public (federal/state) land? Yes ^ No 2. If yes, does the project require preparation of an environmental document pursuant to the requirements of the National or North Carolina Environmental Policy Act (NEPA/SEPA)? Note: If you are not sure whether a NEPA/SEPA document is required, call the SEPA coordinator at (919) 733-5083 to review current thresholds for environmental documentation. Yes ^ No 3. If yes, has the document review been finalized by the State Clearinghouse? If so, please attach a copy of the NEPA or SEPA final approval letter. Yes ^ No ^ X. Proposed Impacts on Riparian and Watershed Buffers (required by DWQ) It is the applicant's (or agent's) responsibility to determine, delineate and map all impacts to required state and local buffers associated with the project. The applicant must also provide justification for these impacts in Section VII above. All proposed impacts must be listed herein, and must be clearly identifiable on the accompanying site plan. All buffers must be shown on a map, whether or not impacts are proposed to the buffers. Correspondence from the DWQ Regional Office may be included as appropriate. Photographs may also be included at the applicant's discretion. 1. e project impact protected riparian buffers identified within 15A NCAC 2B .0233 euse 1 SA NCAC 2B .0259 (Tar-Pamlico), 15A NCAC 02B .0243 (Catawba) 15A NCAC 2B .0250 (Randleman Rules and Water Supply Buffer Requirements), or other (please identify )? Yes [~ No ^ 2. If "yes", identify the square feet and acreage of impact to each zone of the riparian buffers. If buffer mitigation is required calculate the required amount of mitigation by applying the buffer multi Tiers. Zone* Impact Multiplier Required ~ ~ ~ N~~j s care feet Miti ation ~ ~S`J' ~1M ~ ~ ~,. Zl ~~ 1 y ~ ~ ~ ~ 3 (2 for Catawba) (~~f~VPa.JO~ S !! ~~ 2 (~oc~~~~ 1.5 Arm. c~1.1~.~t-~s Total Qj~ g * Zone 1 extends out 30 feet perpendicular from the top of the near bank of channel; Zone 2 extends an additional 20 feet from the edge of Zone 1. 3. If buffer mitigation is required, please discuss what type of mitigation is proposed (i.e., Donation of Property, Riparian Buffer Restoration /Enhancement, or Payment into the Riparian Buffer Restoration Fund). Please attach all appropriate information as identified within 15A NCAC 2B .0242 or .0244, or .0260. Page 11 of 12 XI. Stormwater (required by DWQ) Describe impervious acreage (existing and proposed) versus total acreage on the site. Discuss stormwater controls proposed in order to protect surface waters and wetlands downstream from the property. If percent impervious surface exceeds 20%, please provide calculations demonstrating total proposed impervious level.7- .~+ ~~ t ,i ;~~~ ~ ~ `^ ~ t T_~`~ ' G ~ ~ ~6 ~ - 3% av~ oc-;~, r~--1 sv~~~ pro ~~ -~ Qu XII. Sewage Disposal (required by DWQ) Clearly detail the ultimate treatment methods and disposition (non-discharge or discharge) of wastewater generated from the proposed project, or available capacity of the subject facility. ~~S i~ ~ L. ~ `Sa~v~S~~ to XIII. Violations (required by DWQ) Is this site in violation of DWQ Wetland Rules (15A NCAC 2H .0500) or any Buffer Rules? Yes ^ No ~, Is this an after-the-fact permit application? Yes ^ No XIV. Cumulative Impacts (required by DWQ) Will this project (based on past and reasonably anticipated future impacts) result in additional development, which could impact nearby downstream water quality? Yes ^ No If yes, please submit a qualitative or quantitative cumulative impact analysis in accordance with the most recent North Carolina Division of Water Quality policy posted on our website at htt ://h2o.enr.state.nc.us/ncwetlands. If no, please provide a short nary tive descrp ion: -~,,, „~„ ~~. ~~~ n.~o~c ro ~:~E~ ~ra~ ~ 001 ~~;.~ .~--~-~~ rv--~ lam , XV. Other Circumstances (Optional): It is the applicant's responsibility to submit the application sufficiently in advance of desired construction dates to allow processing time for these permits. However, an applicant may choose to list constraints associated with construction or sequencing that may impose limits on work schedules (e.g., draw-down schedules for lakes, dates associated with Endangered and Threatened Species, accessibility problems, or other issues outside of the applicant's control). r 12/31 ~0 Applican /Agent's Signature Date (Agent's signature is valid only if an authorization letter from the applicant is provided.) Page l2 of 12 ~ 1~ 1~\~- ~--.__.x,17 ll '~ ~.-~~~ ~ ~ , ~ ~ ~ ~~~I/ J ~~ _ ~ , ~' ~ ~ ~- ~_ 1 ~ ~ ~/ / ~\ ~ ( \\ ~~ •' ~ ~ c ' ~ /i~~~ ~ fix' i~ li /.,~~~ ii ,._ , via _.,,' ~"' i ,r~. 1.' L ~ ' ~ `~' \~ O II~M/~ i~lf. ~_-: ~. ii ~ ~ II• ^ ~~ /~~~. /i~ ~~ i_ • •~ ~\ i~ Ji'~ • ~~ ~I; `fit ~ r 1 ~, ;/~ ~~ ~ ~ ~ %~ :; 1 ~ ~ ~~~ L~ :; - • ,, ,, ~ ~. ~~ 1 \ 1 ^ I f ' ~,,-'' ~~ ~~ ! ll, G~ A. °% - -- ~ ~ ~ ~ ,A ~ ~ ~ ~~, ,- ti Z ~~ / ~~ OS • ~I ~' ~ ~~ ~ ~~_ ~ \ .J ~_ ~ ~~. 1 ~/• ~ ~ ~~ s ~, r i ~ / •~ %~ ~~ ~ ~ • ~ ~'6Z ~ ^!/ ~1" ., ~- ~~ -!-, l ~` ~ ~, ~~ ~0/ _ „/ ''~~S ~vd~si/~icrln~ ~~It/23~Gli/! -~ ; ~ '`~ ` ksfw.,yi, ~F~ {~ ~' J. ''~ -~~ Q l n u~ •~ m ~ ~ 1 Y 1 /_.. _5 .~. p { r ~ ~1v` I ` 1 .. ~ 1 -~ - ~'" y,/ Tvi. ~ ~ ~nr ` - r - - ~~~ 1 u 7:r' ~~ C/ ~ _ - .~ ~~ ~.~ r~J "~';~ . ' + ~ z~ ~.= rah ~ ~ .~. 'f {. f,T~ R A h N'LP} a. N ~ L i yr_ K= :,= ~ ~ ~. ,` _~ _. a .~.- ,_ _ ~ ~.~ ~ -; r- ~ ~., 4 .~,C7~951+ 1~~^.".7 ~ L 1 Lr _ U' ~ ~' . ~ • ~ '" L ~~•J{.. t 1. Yf _. r ._ 3. _' ~ _ t \ .~ nt ~, ~~ r _ j~ _ ' ~r ~y ~. 1 ""iy .ro -rte ~~'- _, .. } ~ 'ice +~, ~ - ~ _. ~ ~~ -~ ~,: , iL • _., y~ ~ r ~ a ~ ~ .rv nV~1~V ,~ C ~lhS~'~'{~C~k..'~ it .. •< v r I ~ -. I ilt ~, t oF, {1' +, e~'' I F~ ,E ~ d'1r,T~.,y~.n ~ ~ ~,'~`~~ ~ ~~'~ ~ ""` "^~~ ti~,k 1 ~~ j~ ~ 1 e ~~ ~ ~ s~ ~~] '`r~. v ~~ Vi ~Y I ~ I .. T",;f7jAGl~Rr,WB~xL .. ~nh ~9V rR„M, *,o/ ~. _ - .. .. ~ _w 1 l rl.~lf '`. A... r .~ 1-... .v ,. t l ` `x ~ 1 11 ' ~~~ ~~~ ~IJ •'J• •K'••• February 12, 2007 Jonathan Barnes DALTON ENGINEERING & ASSOCIATES P.O. Box 426 Clayton, NC 27528 Re: Report of Subsurface Investigation Proposed Aluminum Arch Culvert Crossings Timberlake, Phase 2A Clayton, North Carolina GeoTechnologies Project No. 1-07-0089-EA Gentlemen: 3200 Wellington Court, Suite G Raleigh, North Carolina 27615 919-954-1514 Fax 919-954-1428 o~C -o~~ ~, v~ D ~ _ ... JAi~ 2 200 pyETi.ANDS AND STORMWA?l"k BRANCH GeoTechnologies, Inc. has completed the authorized: subsurface investigation. to evaluate foundation support considerations for the proposed aluminum arch culvert creek crossing to provide driveway access into four residentia] lots to be constructed at the Timberlake subdivision located in Clayton, North Carolina. Subsurface conditions at the site were investigated by utilizing hang auger techniques to auger eight soil test borings at each side of the proposed creek crossing and performing dynamic hand cone penetometer (DCP) testing to evaluate the consistency and density of the subsurface soils. The creek crossings were surveyed in the field prior to GeoTechnologies arrival to the site. SUBSURFACE CONDITIONS A generalized subsurface profile prepared from the test boring data is attached to this report as Figure 2 to graphically illustrate subsurface conditions encountered at this site. More detailed descriptions of the conditions encountered at the individual test boring locations are then presented on the attached test boring records. The subsurface profile on the site was found to consist of 1 to 3 inches of topsoil underlain by very soft to soft sandy silts with penetration resistances ranging from 1 to 4 blows per foot (bpf). Test boring 58A encountered a soft silty clay layer of approximately one foot in thickness in the upper 4 feet. Test boring 57A encountered a stiff sandy clay layer of approximately 2 and a half feet in thickness at a depth of 7 and a half feet. Penetration resistances in these silty and sandy clay layers ranged from 4 to 15 plus bpf. Borings 56B, 57B, 58A, and 59A encountered a silty sand layer from 0.5 feet to 2 feet in thickness and each test boring experienced caving at depths from 6 to 7 and a half feet which terminated augering. Penetration resistance in these silty sand layers ranged from 6 to ] 5 plus bpf. Test boring 58B also caved in at a depth of 8 feet and test boring 56A had auger refusal at 7 feet. Boring 57A and 59B were extended to a depth of 10 feet and both were experiencing blow counts from 10 to 15 plus bpf . Geotechnica/ and Construction Materials Testing Services r . e h 1 ~ Dalton Engineering and Associates Timberlake, Phase 2A February 12, 2007 Page: 2 Groundwater was encountered from 5 to 9 feet below site grade at the time of boring completion in every test boring except boring 56B and 57A It should be recognized that groundwater levels will vary with seasonal and climatic changes and that they may be higher or lower at other times of the year. We anticipate the stabilized water levels will occur at depths equal to or slightly above the water elevation in the adjoining creek. Some perched water conditions will also develop following periods of wet weather. RECOMMENDATIONS The following recommendations are made based upon a review of the attached test boring data, our understanding of the proposed construction, and past experience with similar projects and subsurface: conditions. Should site .:grading or structural plans change significantly from -those now under consideration, we would appreciate being provided with that information so that these recommendations may be confirmed, extended, or modified as necessary. Additionally, should subsurface conditions adverse to those indicated by this report be encountered during construction, those differences should be reported to us for review and comment. Foundation Support Recommendations. No information regarding the actual aluminum arch culvert, including the bearing elevation, was provided to GeoTechnologies. Since about 3 to 4 feet of overburden soils will need to be removed to reach the creek bottom elevation, we anticipate that the structure will either bear on the firm to stiff silts from about 4 to 6 feet. For bearing on the ftrm to stiff silts, we suggest assuming an allowable bearing capacity of 3,000 psf. All excavations should be approved by a geotechnical engineer. Once suitable bearing conditions are exposed, the excavations should be backfilled with full depth concrete. It may be necessary to place a mud mat immediately following excavation to preserve the exposed subgrades prior to placement of the remainder of concrete for the foundations. Although our borings suggest adequate bearing will be achieved at about 4 to 6 feet, it should be expected that conditions will vary and excavation depths may be deeper in some areas. Additionally, the contractor should be prepared to handle water which will likely enter the excavation. Once the foundations have been installed, we recommend that all backfill soils be recompacted to at least 95% of the standard Proctor maximum dry density. A scour analysis was beyond the scope of our investigation, but we recommend that the project civil engineer perform this analysis as part of the design process. The borings were not extended deep enough for analysis of an intermediate to deep foundation. If these options are. needed, then deeper borings can be advanced to. determine specific depths for deep foundation elements. ~. ~~~• Dalton Engineering and Associates Timberlake, Phase 2A February 12, 2007 Page: 3 If any headwalls will be constructed, we recommend that the below grade walls be designed for a triangular lateral earth pressure distribution based on the assumption that the soils behind the walls will act as an equivalent fluid weighing 50 pcf above the water table and 90 pcf below the water table. This assumes that only approved backfill materials will be utilized. All backfill materials placed within 3 feet of the wall should be compacted with hand held tamps rather than heavy equipment to minimize pressures against the below grade walls. In order to prevent abuild-up of hydrostatic pressure behind the walls, a sand filter or some form of specialty drainage material such as an Enka drain or Mira drain should be utilized to collect water which would migrate towards the walls and to direct that water to a foundation drain. A backflow value should be placed within the collector pipe. GeoTechnologies, Inc. appreciates the opportunity to be of service on this phase of the project. Please contact us if you have any questions concerning this letter or if we may be of additional service on this or other projects. Sincerely, JBC/lam 070089ea.doc GeoTechnologies, Inc ~~~~eauu~~~~ .~,` ~`~ '~~ r F r (" ~.©~ + .~~~ 0 q ~ ~~F2 fn ~, ~_ m ~ ~Y F2 o a Toby Mallik, P.E. '~ c6 ®® NC Registration No. 26472 ;~.j ®~~~f ~®I~~.~°e `~~~ ~v~~ [\ ~ ~ 'J ~' -_- -_--- .. .._ ~.``~ `~ `: is a _ _~_ ___ ___~~_f.- - .-~ _ _ ---_~ __-_ -_-_ _~' ~jf' _ ___ -~ _~ - - _--_-- - - - :i Vii':; "~"~ ~: '':''_:. __~~ -~~"oar. .4:J~ - ~: ~ _ = ~ -i ~ii ~~i --_=::;~ - -;rte -- _ y~' l`~. _ _ -- >% - - - - - - : ~. ~;;;, :H" •' / if _ - jam,, i(~;i~1i~' ~:yLy1M~~Il.-~O~~~F~ p15}URgyKE.--..v ~, _ _ - .` ~, - - .'-tie ` - _ - - - - -- ~% - ~,1 - - "'`~'.` - - Jh-' - - ~ '-- - - ~ - - -_ - _ =- - ~°E'.ARQI. _._ ~ f _ _8a?agi wr apEF'Ex: _;~: - J - _ ' .~ - _ _ .. .. _ _ ~~ _' w ~. ... a_ _ _ `_, "- _- - .. .- .. ~ ~ __ .. _ - . 9/j` J - - ~ - ,. ... _ - ~_ _ _ -_ _- _ _- ..v s ! " - . __ - - `-_ _59. `,~ ~`; :iii?; -_ , i - - `.~~}' -'~~ _~-~ viii :~'H.~x: ~~ ~ _ ~__ :1s~ ~_ ~ ~ -_~ _= ==: r ~l.-~ _ _ _. T _ `j' _ 4~N _ 36" ACP - ~ Y-~ - ;' ' _. - . . _ _ ~C ~i 9+. - 16.02 AC - -- - 36' 0.CP. a - ie.oz x PROJECT: SCALE: Not to Scale. \. -:. JOB NO: 1-07-0089-EA ~:::::::::::. FIG NO: 1 Timberlake Phase 2A Culvert ~ ~ ~ ~ ~ Cla ton North Carolina c ~o ~ m w ~ o ~ m ~ a E _ ~ Q ~ U = io Z ~ ~ C V V U N N L ~p U l0 w a 'o a u~ a ~ ~ ~ o W o- 3 w 3 0 0 3 J H J fq J a0 C7 Q U r M N tp 00 m W ~ J LL ~' ~ o 0. M ~ T W o U Q "' ~ ~ o r u~ ao T ~ ~ m ~ i fA Q ~ ~ ~ ~ N a o o J ~ ~~ Q ~ W N ~ Z m W ~ ' V ~I r r Ln Ltd M T T r T Q n M M Ln r m 0 N r tO r Q d ~ ~ ~i t d O r N M' 'cf ~ CO h OO Q1 O p r r N O Z W C7 a~ ~ ~ U ~ N .O d t~4 NU ~ t n. '~ ~ 0 .Y Z ~ r _~ H- U a w c 3 0 0 0 .~ o ~ ti N O Q ~ LJ.1 O J Z U Q ~ ~ DYNAMIC HAND CONE PENETROMETER RECORD DEPTH (FT.) 0.0 0.2 5.0 7.0 DESCRIPTION ELEVATION PENETRATION PER BLOWS PER (FT.) INCREMENT 13/4" 0 10 20 40 60 100 To soil Very Soft to Firm Light Gray Orange Tan Fine MI' Sandy Silt 2-3-2 2-1-1 Firm to Stiff Gray Fine Sandy Silt with Mica, ML 4-5-5 .~ Hand Auger Refusal at 7.0' (On Gravel) 9-10-11 i 'r i i t C Groundwater encountered at 6.5' JOB NUMBER 1-07-0089-EA ~ BORING NUMBER 56A .::= DATE 1-29-07 ~% ~~ ~ ~ - 1 1 ~ ~® PAGE 1 OF 1 s i i i DYNAMIC RAND CONE PENETROMETER RECORD DEPTH (FT.) 0.0 0. 4.( 6.0 DESCRIPTION ELEVATION PENETRATION PER BLOWS PER (FT.) INCREMENT 13/4" 0 10 20 40 60 100 To soil Soft to Firm Gray Tan White Fine to Medium ML Sandy Silt 2-3-3 4-5-5 Firm to Stiff Gray Tan White Silty Fine to Medium SM Sand with Small Rocks and Mica 10-11-15 Boring terminated at 6.0' r c E c c c c 2 F L Groundwater not encountered at time of boring. Caved at 6'. JOB NUMBER BORING NUMBER DATE PAGE 1 OF 1 1-07-0089-EA ~ 56B 1-29-07 ~.......... ~ 1 ~ 1 DYNAMIC HAND CONE PENETROMETER RECORD DEPTH (FT.) 0.0 0. 4.5 6.5 7.5 10.0 DESCRIPTION ELEVATION PENETRATION PER BLOWS PER (FT.) INCREMENT 13/4" 0 10 20 40 60 100 To soil Sofa to Stiff Orange Tan Gray Fine Sandy Silt MI' 4-4-3 9-10-12 Stiff Orange Tan Silt with Mica ML 12-12-11 StiffLight Brown Tan Fine Sandy Silt with Mica ML 15+ Stiffto Very StiffLight Brown Tan Fine to CL Medium Sandy Clay with Mica 15+ t _ c Boring terminated at 10.0' c c 2 t c Groundwater not encountered at time of boring. JOB NUMBER BORING NUMBER DATE PAGE 1 OF 1 1-07-0089-EA ~ 57A 1-29-07 ~ 1 1 1 s i DYNAMIC HAND CONE PENETROMETER RECORD DEPTH (FT.) o.o 0.1 5.0 6.5 Groundwater encountered at 6.0'. Caved at 6.5'. DESCRIPTION ELEVATION PENETRATION PER BLOWS PER (FT.) INCREMENT 13/4" n ~n Zn an ~n inn To soil ML Soft Gray Tan Orange Fine Sandy Silt with Mica 2-2-2 4-4-4 Stiff Gray Silty Fine to Medium Sand with Gravel and Mica SM 14-15-15 Boring Terminated at 6.5 JOB NUMBER BORING NUMBER DATE PAGE 1 OF 1 1-07-0089-EA ~ 57B 1-30-07 /:~:::~:~:. - - 1 11 ~~ ~ ~: ~~~ 0 N H O U' N 'a L7 of m z ~~ c~ DYNAMIC HAND CONE PENETROMETER RECORD , DEPTH (FT.) o.o 0.2 3.0 4.0 7.0 7.5 DESCRIPTION ELEVATION PENETRATION PER BLOWS PER (FT.) INCREMENT 13/4" n in Zn ao ~o ino To soil Soft Brown Tan Gray Fine Sandy Silt ML' 3-4-4 Soft Dazk Gray Silty Clay CL 8-4-5 Firm Gray Tan Slightly Clayey Silt ML 5-5-6 ~_ Firm Dazk Gray Silty Fine to Medium Sand SM 6-7-6 Boring Terminated at 7.5' i i Groundwater encountered at 7.0'. Caved at 7.5'. JOB NUMBER BORING NUMBER DATE PAGE 1 OF 1 1-07-0089-EA ~ 58A 1-29-07 ~ ~ ~ ~ - N N F- 0 H C7 m O O r 0 2 Q F C7 DYNANIIC HAND CONE PENETROMETER RECORD DEPTH (FT.) o.o 0. 3.( 6.0 7.0 8.0 DESCRIPTION ELEVATION PENETRATION PER BLOWS PER (FT.) INCREMENT 13/4" n in ~n an ~n inn To soil Very Soft to Firm Tan Brown Orange Fine Sandy Silt M L 2-1-1 Firm to Stiff Brown Tan Orange Fine Sandy Clayey Silt with Mica ML 7-5-6 6-7-10 Stiff Gray Tan Fine Sandy Silt with Mica ML ~ Stiff Gray Tan Fine to Medium Sandy Silt with Mica ML 11-10-10 Boring Terminated at 8,0' Groundwater encountered at 7.0'. Caved at 8'. JOB NUMBER BORING NUMBER DATE PAGE 1 OF 1 1-07-0089-EA ~ 58B 1-30-07 ~....... - ~ ~ ~ 0 N H 0 C7 H C7 a 0 0 0 Q F- DYNAMIC HAND CONE PENETROMETER RECORD DEPTH DESCRIPTION (FT.) o.o C 4.. 6.( JOB NUMBER BORING NUMBER DATE PAGE 1 OF 1 ELEVATION PENETRATION PER (FT.) INCREMENT n ~n ~n ~n ~n inn BLOWS PER 1 3/4" 1-07-0089-EA 59A \.......... 1-29-07 • 1 11 " Urounawater encountered at 5.U'. Caved at 6'. f DYNAMIC HAND CONE PENETROMETER RECORD DEPTH (FT.) o.o 0. 2. 5'. i 10.0 DESCRIPTION ELEVATION PENETRATION PER BLOWS PER (FT.) INCREMENT 13/4" n ~n ~n an ~n inn 3 Topsoil Very Soft Yellow Brown Fine Sandy Clayey Silt ML 3-3-3 Very Soft to Firm Yellow Brown Gray Silt with ML Mica i 2-2-2 Firm.to StiffBrown Gray Tan Fine Sandy Silt with ML 4-5-6 Mica _ 7-8-9 ~ 8-10-11 _ c v F C Boring terminated at 10.0' a a m S 0 z a C7 Groundwater encountered at 9.0' JOB NUMBER 1-07-0089-EA ~ BORING NUMBER 59B DATE 1-29-07 ~ _ ~ ~ ~ ~ _ PAGE 1 OF 1