SW6240904_Design Calculations_20241007

Docusign Envelope ID:8F10AE07-C683-4C05-8D4F-F3DBD2E4D182
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ORATE GROUND STABILIZATION AND MATERIALS HANDLING PRACTICES FOR COMPLIANCE WITH THE NCG01 STRUCTURE CONCRETE
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CONSTRUCTION GENERAL PERMIT WASHOUT '(•.F 4 24,.•;.-F. z
EQUIPMENT AND VEHICLE MMNTENANCElik' "STRAW W/NET" �'•�
Implementing the details and specifications on this plan sheet will result in the construction activity being 1. Maintain vehicles and equipment to tdischar discharge o a: I'^• ' k�t� .ELT / ''z $a33.w prevent g Pp,P,-�-e9,L ",°i�8. TEMP.SWALE /I�
eneralredmit(S(Sections
h the Ground Stabilization and Materials Handling sections of Erosion
NCGO1 edimeConstruction 2. provide dripder an toredequipment. E '"� �'"' 1, r 0 pans tin anyo■ � krF LINER AS SHOWN RFL
General Permit(Sections Eand F,respectively).The permittee shall comply with the Erosion and Sediment P_ �; key--„a'! I-' A/l/l1 I \\\\\\ co
Control plan approved by the delegated authority having jurisdiction.All details and specifications shown on this 3. Identity leaks and repair as soon as feasible,or remove leaking equipment from the project. M F....EJ-J 4201 z4
sheet may not apply depending on site conditions and the delegated authority having jurisdiction. 4, Collect all spent fluids,store in separate containers and properly dispose as hazardous waste(recycle m - o
when possible). i �"�" ���•� S' °
SECTION E:GROUND STABILIZATION leaking vehicles equipment problem
'r""m"®"`• 1 1 2.5 2 E
5. Remove leakin h les and constmctione tfrom service until the oblem has been corrected. ":.
6. Bring used fuels,lubricants,coolants,hydraulic fluids and other petroleum products to a recycling or P°e ®"�"� P� SOT E.
Required Ground Stabilization Timer tames rw „® =. aw m.®tvzr-.� 3 3 cN ACT z m
disposal center that handles these materials.
ct\ ,.��
Stabilize within this �' o, z
She Area Description many calendar days Tmehame variations snow GR.taw:,stm.% ())). .(-2)cnu SEED PER ¢ 'e DUN a,
after ceasing land PROJECT >
disturbance LITTER,BUILDING MATERIAL AND LAND CLEARING WASTE SPECS
(a) Perimeter dikes,swales, 1. Never bury or burn waste.Place litter and debris ins d waste containers. ` (J t approved PERMANENT SWALE"A" EASILY ERODIBLE
3
ditches,and perimeter 7 None 2. Provide a sufficient number and size of waste containers(e.g dumpster,trash receptacle)on she to (NTSI NON-PLASTIC Qk +' m��
Slopes contain construction and domestic wastes. 0.5'MIN.FREEBOARD N30iv^
(SANDS&SILTS) 11tl 2i
(b) High Quality Water(HOP) 3. Locate waste containers at least 50 feet away from storm drain inlets and surface waters unless no other (1.5'MAX NORMAL WITH PERM BERMUDA
7 None alternatives are reasonably available. ROADSIDE DITC..H 'Al. f.Ur A71ON TARIF DEPTH) \ , GRASSE.
Zones yavaia
4. Locate waste containers en areas that do not receive substantial amounts of runoff from upland areas and STREET STA C I A Q10(CFS) SWALE SLOPE n NORMAL DEPTH VELOCITY SHEAR STRESS SWALE TYPE SHEAR STRESS
If slopes are10'or less in length and are (IN/HR)(AC.) =CIA (5) (FT) (FT/5) REQUIRED(PSF) PROv1DED(PSF)
not steeper than 2:1,14 days does not drain directly to a storm drain,stream or wetland.
(<) Slopes steeper than so 7 per ys are CONCRETE WASHOUTS A 0+00-CSDL 0.5 7.2 0.5 1.8 0.50 0.03 0.6 1.5 0.19 A 1.45
allowed 5. Cover waste containers at the end of each workday and before storm events or provide secondary
containment.Repair or replace damaged waste containers. 1. Do not discharge concrete or cement slurry from the site. A 0+00-CDSR 05 ].2 5.4 19.4 C50 0.03 1.5 2.8 0.4] A 1.45
-7 days for slopes greater than 50'in length and 6. Anchor all lightweight items in waste containers during times of high winds. 2. Dispose of,or reootle settled,hardened concrete residue in accordance with local and%ate solid waste -
with slopes steeper than 4:1 7. Empty waste containers as needed to prevent Overflow.Clean up immediately if containers overflow. regulations and at an approved facility.
(d) Slopes 3:1te4:1 14 -7 days for perimeter dikes,swales,ditches, 8. Dispose waste off-site at an approved disposal facility. 3. Manage washout from mortar mixers in accordance with the above it and in addition place the mixer
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perimeter slopes and HQW Zones 9. On business days,clean up and dispose of waste in designated waste containers. and associated materials on impervious barrier and within lot perimeter sit[fence.
-10 days for Falls Lake Watershed 4. Install temporary concrete washouts per local requirements,where applicable.If an alternate method or Ei
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-7 days for perimeter dikes,swales,ditches, product is to be used,contact your approval authoctyfor review and approval.If local standard details
perimeter slopes and HQW Zones PAINT AND OTHER SQUID WASTE are notavailable,use one of the two types of temporary concrete washouts provided on this detail.
(e) Areas with slopes flatter 14 -30 days for Falls Lake Watershed unless there is err, 1. Do not dump paint and other liquid waste into storm drains,streams or wetlands. 5. Do not use concrete washouts for dewateringbeg limpeor d intodefective curb orsideedowalk sections.Slormwater -
than 4:1 accumulated within the washout may not pumped or discharged to the storm drain system or Er
slope 2. Locate paint washouts at least 50 feet away from storm drain inlets and surface waters unless no other receiving surface waters.Liquid waste must be pumped out and removed from project.
alternatives are reasonably available. 6. Locate washouts at least 50 feet from storm drain inlets and surface waters unless it can be shownthat
Note:After the permanent cessation of construction activities, areas with temporary ground stabilization shall 3. Contain liquid wastes in controlled area. o P Y P ryno other reasonably available.Ata minimum,install protection of storm drain inlet(s)
be converted to permanent ground stabilization as soon as practicable but in no case longer than 90 calendar days 4. Containment must he labeled,sized and placed appropriately for the needs of site. closest to the washout which could receive spills or overflow.
after the last land disturbing activity.Temporary ground stabilization shall be maintained in a manner to render 5. Prevent the discharge of soaps,solvents,detergents and other liquid wastes from construction sites. 7. Locate washouts in an easily accessible area,on level ground and install a stone entrance pad in front of
the surface stable against accelerated erosion until permanent ground stabilization is achieved. the washout Additional controls may be required by the approving authority. O
GROUND STABILIZATION SPECIFICATION B. Install at least one sign directing concrete trucks to the washout within the project limits.Postsignage an Sti >
the Stabilize the ground sufficiently so that rain will not dislodge the soil.Oct one of the techniques in the table Remove
leavingsout itse frf om the
this location. ? m
9. Remove from the washout when at approximately75%capacity to limit overflow events. a
below: PORTABLE TOILETS
Temporary Stabilization Permanent Stabilization 1. Install portable toilets on level ground, 50feet away from storm drains,streams or wetlands unless ReplacetihA alernat,e or bzgsmarhprodmporaryowuctnuf<omponenstuOio When solongerfunctional.When z 3 0,~z
po groan y utilizing alternative or proprietary products,follow manufacturer's instructions. z O z
•Temporary grass seed covered with straw or Permanent grass seed covered with straw or there is no alternative reasonably available.If 50 foot offset is not attainable,provide relocation of 10. At the completion of the concrete work,remove remaining leavings and dispose of in ana d z• ,-O, Co O T p g g p approved
other mulches and[edifiers omermulches and ta<kifiers portable toilet behind silt fence or place onagmvel pad and surround with sand bags. O ���
disposal facility.Fill pit,if applicable,and stabilize any disturbance caused by removal of washout. z w w ,,, z Lp
•Hydreseeding •Ge0rextile fabrics such as permanent soil 2. Provide staking or anchoring of portable toilets during periods of high winds or in high foot traffic areas. ¢ z z�z
•Rolled erosion control products with or reinforcement matting 3. Monitor portable toilets for leaking and properly dispose of any leaked material.Utilize licensed sanitary O P z a 2 LD
without temporary grass seed •Hydroseeding waste hauler to remove leaking portable toilets and replace with properly operating unit. ~ s a f J
•Appropriately applied straw crosser mulch •Shrubs or other permanent plantings covered
•Plastic sheeting with mulch A
•Uniform and evenly distributed ground cover HERBICIDES,PESTICIDES AND RODENTICIDES
sufficient to restrain erosion EARTHEN STOCKPILE MANAGEMENT 1. Store and apply herbicides,pesticides and rodenticides in accordance with label restrictions. CS
•Structural methods such as concrete,asphalt or 1. Show stockpile locations on plans.Locate earthen-material stockpile areas at least 50feet away from 2. Store herbicides,pesticides and rodenticides in their original containers with the label,which lists
retaining walls storm drain inlets,sediment basins,perimeter sediment controls and surface waters unless it can be directions for use,ingredients and first Ad steps in case of accidental poisoning.
•Rolled erosion control products with grass seed Shown n0 other alternatives are reasonably available.
he2. Protect stockpile with silt fence installed along toe of slope with a minimum offset of five feet from the toe 3. Do not storeleak intnsides,pesticides and rodenticides in areas where flooding is possibleorwherethey
of stockpile. may spill or o wells,stormwater drains,ground water or surface water.If a spill occurs,clean area o
POLYACRYLAMIDES(PAW)AND FLOCCULANTS 3. Provide stable stone access when feasible. immediately. m
point
4. besot stockpile these materials onsite.
1. Select flocculants that are appropriate for the soils being exposed during construction,selecting from the q. Stabilize stockpile within thetimefmmes provided on this sheet and in accordance with the approved plan z
NCOWR Lis[of Approved PAMS/Flocculants. and any additional requirements.Soil stabilization is defined as vegetative,physical or chemical coverage p
2. Apply flocculants at or before the inlets to Erosion and Sediment Control Measures. techniques that will restrain accelerated erosion on disturbed soils for temporary or permanent control HAZARDOUS AND TOXIC WASTE
3. Apply flocculants at the mncentratlone specified in the NCDWfl List of Approved PAMS/Flocculenfs and in needs.
accordance with the manufacturer's instructions. 1. Create designated hazardous waste collection areas on-site.
4. Provide pending area for containment of treated Stormwater before discharging offsite. 2. Place hazardous waste containers under cover oredsecondary containment.
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5. Store fioccidents in leak-proof containers that are kept under storm-resistant cover or surrounded by 3. Do not store hazardous Chemicals,dmmsor bagged materials directly onthe ground.
secondary containment structures.
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NCGO1 GROUND STABILIZATION AND MATERIALS HANDLING EFFECTIVE:04/01/19
PART III PART III
SELF-INSPECTION,RECORDKEEPING AND REPORTING SELF-INSPECTION,RECORDKEEPING AND REPORTING
PART III
SECTION A:SELF-INSPECTION SECTION B:RECORDKEEPING SELF-INSPECTION,RECORDKEEPING AND REPORTING
Self-inspections are required during normal business hours in accordance with the table below.When adverse 1.E&SC Plan Documentation (.-
weather or site conditions would cause the safety of the inspection personnel tobeinjeopardy,the inspection The a edE&SCplan as well as anya approved shall be kept site.The approved E&SCplan SECTION C:REPORTING U P
mayhe delayed until the next business daywhich it is safe to perform the inspection.In addition,when be kept
coverage
D D ..
yeanw is pe Dec ion. 1.Occurrences that Must be Reported '�'
storm event of equal to or greater than 1.0 inch occurs outside of normal business hours,the self-inspection shall must be kbek pro-date throughout the coverage under this permit.The following items pertaining to the E&SC
be performed upon the commencement of the next business day.Anytime when inspections were delayed shall Plan shall be kept on site and available for inspection at all Omen during normal business hours. Permittees shall report the following occurrences:
(a) Visible sediment deposition in a stream or wetland. CL o
be noted in the Inspection Record. Item to Document Documentation Requirements �Ho.
FrequencV lal Each E&SC measure has beet instated Initial and date each E&SC measure on a copy (b) Oil Spills if: L1_
inspect (duringInspection records must include: and doe no significantly deviate from the of the approved E&SC plan complete,date N -
business urs1) locations,dimensions and relative elevations and sign an inspection reportr that lists each • They are 25 gallons or more, LLJ M
Ill Ram gauge y ha rainfall amo shown on the approved E&SE plan. MSC measure shown on the approved E&SC • They are less than 25 gallons but cannot be cleaned up within 24 hours, w d oac tying h if no oliday periods,
plc.This documentation is reuired upon the
rder _ Um of me MSC measures or if • They cause sheen on surface waters(regardless of volume),or w „o
atm..days c Dram this will determine if a site insp.tion is The iE&SGtmeasures are modified after initial • They are within 100feet of surface waters(regardless of volume).
needed).o installation. N c -
useanotherrainmanitonngaevice (b)A approved by the Divisionphase of grading has been completed. Initial and date a copy of the approved E&SC Zy
IzI E& inspected, plan lor ecomplete,dale and sign [ion (c) Releases of hazardous substances in excess of reportable quantities under Section 311 of the Clean
Measures report to indicate completianof thenspec Water Act(Ref:40 CFR110.3 and40 CFR 117.3)or Section 102 of CERCLA(Ref;40 CFR 302.4)cur G.S.143-215.85. w I- I v, -
a.within 24 3.NTIlle of the person pertorming the inspection, construction phase. 11 1 roO i °
hours of a rain v.Exec,to inch in indication o�iwhether the measures were operating (c)Ground cover is located and installed Initial and date a copy of the approved E&SC (d) Anticipated bypasses and unanticipated bypasses. RrrR.rR .03. cv
24 hours 5.DeSCriptiOn of maintenance needs for the measure, in accordance with[he approved E&SC plan or complete,date and sign an inspection
6. smptan,evidence,and date of corrective actions taken, plan report m indicate compliance with approved
(3)Stemwater sus Inspected, ground cover specifications. (e) Noncompliance with the conditions of this permit that may endanger health or the environment. w (41'calendar days 2.Date and time of[be inspection, IL
outtalk(SDOs) (d)Themaintenance and repair Complete,date and sign n inspection report. j
hours ot a rain 4.Evidence of indicators of stormwater pollution such as oil requirements for all E&SC measures roes 2.Reporting and Other Requirements Vo
event,Ito men In have been performed.24 hours 5.Indication of visible sediment leaving Me site, After permittee becomes aware of an occurrence that must be reported,he shall contact the appropriate
6.Descnotion,evidence,a.date of corrective actions taken. lei Corrective actions have been taken Initial and date acocc of[he approved E&SC Division regional office within the time frames and in accordance with the other requirements listed below. I -oN
141 Pcimeter of At lent One per If VISIble SedirnentatiOn IS toUnd OutS.Icle sire limn E&
s,then a record to SC measures. plan or complete,date and sign en inspection Occurrences outside normal business hours may also be reported to the Department's Environmental Emergency cTm
HAa calendardays of the following shall
a.within o4 T.Actions taken toclea made:stabilize the sediment that has lent corrective at
the completion of the Center personnel at(800)B56-0366.
hours Oa rain the site limits,
event,16 inch in ,and Oct Reporting Timeframes(After Otacovery)and Other Requirements �P
24 hours ion as to the actions taken to controlluture 2.Additional Documentation to be Kept on Site (a)Visible tedim nt hours, no on n Within leeleo , oral tar reotr it containsad
In addition lo the E&SC plan documents above the following items shall be kept on the deposition ins a • Within 7tarendardays,arepon that containsadescription of the
IA streams
or At least once per It the stream or.,ice ion a site and available for inspectors at all times during normal business hours,unless the stream or wetland sediment anc actions taken to address the cause of the deposition.
w aen visible increaseded of the followtland has ynomthe idshall be made:d visible ono Division provides a site-specific exemption based on unique site conditions that make Division staff may waive the reculrement for a written report on a 2
Iwh or unite a.within 24 scrimion,evidence and damecorrective aalonstmen,and this requirement not practical: se-by-case basis.
accessible) _1.0 inch in taro • If the stream is named on the NC 303(d)listasimpairedforsediment it
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ere24 hours Regional Office per Part III,ed repent tomcepm lzj(a)oefonstpermit. (a) This General Permit as well as the[ertfficate of[overage,after it is received. related causes,the permittee may be required to perform additional r
MI prom, phase grading lostallatio�n of perimeter E&sc monitoring,inspections or apply more stringent practices if staff • _
stabilization of grading Dec g previous perm' requireddetermine that additional requirements are needed to assure compliancet. -
memorm oures,eeris,completion ofalllananon of ng (b) Records of inspections made during the twelvemonths.The rose shall record ihe U
awitrecoanstruction or redeveiopmlent,,permanent observations observations en the Inspection Record Form provided by the Division ore similar inspection form that with the federal or,oraltate impaired-waters conditions. 1 ,
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Verb includes all the required elements.Use of electronically-available records in lieu of the required paper release of
and • Within 24 hours,an oral or electronic notification.The notification
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2.Documentation Mat Me required grou.stabilization will be if shown to rovidee ualaccessand utili as the hard-copy records. release of shall include information about the date,time,nature,volume and
measures have boon provIcled within Mc required espies p q ry pyr hazardous location of the spill or release. l/)
assurance.that they will be provided as 3.Documentation to be Retained for Years substances per Item CONSTRUCTION SPECIFICATIONS -soon a possible.timer...an All data used to complete the e-NOI and all inspection records shall be maintained fore period 1(b)-(c) PLACE RIPRAP SO THAT IT FORMSEWITH DENSE, I I I
NOTE:The min inspection resets there required day inspection requirement of years after project completion and made available upon request 40 CFR 122.411bypasses
•Areport at least ten days before the sate of the bypass,if possible. WELL-GRADED MASS OF STONE WITH A MINIMUM OF b
D 9 Ymspec q y Prl P q ( bypasses[60 CFR he report shall include an evaluation of the anticipated quality and VOIDS.THE DESIRED DISTRIBUTION OF STONES
122.41(m)(3)] effect of the bypass. THROUGHOUT THE MASS MAY BE OBTAINED BY =
PART II,SECTION G,ITEM(4) (d)Unanticipated • within 24 hours,an oral or electronic notification. SELECTIVE LOADING AT THE QUARRY,AND o t3
bypasses KO CFR • Within 7 calendar dos,a report that includes an evaluation of the RIP RAP GRAVEL CONTROLLED DUMPING DURING FINAL PLACEMENT.
DRAW DOWN OF SEDIMENT BASINS FOR MAINTENANCE OR CLOSE OUT 122.41(m)(3)] quality and effect of the bypass. 1 SIZED&PLACED PLACE RIPRAP TO ITS FULL THICKNESS IN ONE (,/) CO °`m
2.5' AS PER PLAN OPERATION.DO NOT PLACE RIPRAP BY DUMPING
(e)Noncompliance • Within 24 hours,an oral or electronic notification. 3 4" 3 , Y �p THROUGH CHUTES OR OTHER METHODS THAT l./) <LL
Sediment basins and traps that receive runoff from drainage areas of one acre or more shall use outlet structures that withdraw water from the surface when these devices need to be drawn down for maintenance or close out unless this is with the conditions • Within 7 calendar days,a report that contains a description of the •, E SEGREGATION T W
infeasible.The circumstances in which it is not feasible to withdraw water from the surface shall be rare(for example,times with extended cold weather).Non-surface withdrawals from sediment basins shall be allowed only when all of the of that ' -.,. , CAUSE SG EGATIONOFSERLYING TAKE CARE Q 0 0( p permitnoncompliance,xactate its causes;and it periode nfnoompliaceh a .•a
p2 ,M.,I) NOT TO DISLODGE THE UNDERLYING BASE OR E
(allowing criteria have been met: may endanger including exact dates and times,and if the noncompliance has not I FILTER WHEN PLACING STONES.
health or the been corrected,the anticipated time noncompliance is expected to RIP RAP d50=6 ,. �) O ent[40 continue;treoccurrence
andsteps taken or planned to reduce,eliminate,and RIP RAP APRON' o
(a) The MSC plan authority has been provided with documentation of the non-surface withdrawal and the specific time periods of conditions in which it will occur.The non-surface withdrawal CFR 1zz.41lp(7)] prevent reoccurrence of the irontompliante.[40 CFR 122A11111h1- MIN DEPTH=18" THICKNESS AS I MAINTENANCE 0
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shall not commence until the E&SC plan authority has approved these items, • Division staff may waive the requirement fora written report ana AS SHOWN PER PLAN '�� RIPRAP SHOULD BE INSPECTED PERIODICALLY AND w
(b) reportedanticipated bypass in accordance with ()(c)and() permit, case-by-case basis. AFTER HEAVY STONE&CONTROLLLS SCOUROFWEED OR o
The non-surface withdrawal has been as an antici t dd Part Ill,Section C,Item 2 d ofthis , w
DISLODGED GRO TO MA BEEEDEDI AND I I I
(c( Dewateringdischarges are treated with controls tO minimize discharges 0f pollutants from stOrmwatef that is removed from the sediment basin.Examples of appropriate controls includehums FABRIC BRUSHGROWTME ATENEEDEDLLNEE
properly sited,designed and maintained dewatering tanks,weir tanks,and fihretion systems, 6"MIN. LOCATIONS.IMMEDIATELY MAKE ALL NEEDED <Q t5'.
(d) Vegetated,upland areas of the sites or a properly designed stone pad is used to the extent feasible at the outlet of the dewatering treatment devices described in Item(c)above, REPAIRS TO PREVENT FURTHER DAMAGE. I- Z Z
(e) Velocity dissipation devices such as check dams,sediment traps,and riprap are provided at the discharge points of all dewatering devices,and Q w a
(f) Sediment removed from the dewatering treatment devices described in Item(c)above is disposed of in a manner that does not cause deposition of sediment into waters of the United States. z 8 . c
PERMANENT RIP RAP"Trl DETAIL w
NCGO1 SELF-INSPECTION, RECORDKEEPING AND REPORTING EFFECTIVE:04/01/19 (NOT TO SCALE) C7 o 11 a
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