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Home My WebLink About20081466 Ver 1_More Info Received_20120130Lucas, Annette From Glenn Morris [genn @burtonengineering com) Sent Monday January 30 2012 12 40 PM To Lucas Annette Subject Hambnght Rd WQ Attachments SandFilterO &M pdf ExtDryPondO &M pdf Thanks Annette) Permit Number (!o be pi of ided b) DWQ) Drainage Area Number Sand Filter Operation and Maintenance Agreement I will keep a maintenance record on this BMP This maintenance record will be kept in a log in a known set location Any deficient BMP elements noted m the inspection will be corrected repaired or replaced immediately These deficiencies can affect the integrity of structures safety of the public and the removal efficiency of the BMP Important maintenance procedures - The drainage area will be carefully managed to reduce the sediment load to the sand filter - The sedimentation chamber or forebay will be cleaned out whenever sediment depth exceeds six inches - Once a year sand media will be skimmed - The sand filter media will be replaced whenever it fails to function properly after maintenance The sand filter will be inspected quarterly and within 24 hours after every storm event greater than 10 inches (or 15 inches if m a Coastal County) Records of operation and maintenance will be kept in a known set location and will be available upon request Inspection activities shall be performed as follows Any problems that are found shall be repaired immediately i.in ind Vlaavtf L BMP element- _ T Potential emblem. � _ How I will remediate the problem Entire BMP Trasb/debrWjp present Remove the trash/ debris Adjacent pavement (if Sediment is present on the Sweep or vacuum the sediment as soon as applicable) pavement surface possible Perimeter of sand filter Areas of bare soil and /or erosive Regrade the soil if necessary to remove the gullies have formed gully and then plant a ground cover and water until it is established Provide lime and a one time fertilizer application Vegetation'is too sh�rt or too long t ti r Maintain vegetation at an appropriate height Flow diversion structure The structure is clogged Unclog the conveyance and dispose of any sediment offsite The structure is damaged Make any necessary repairs or replace if damage is too large for repair Forebay or pretreatment area Sediment has accumulated to a Search for the source of the sediment and depth of greater than six inches remedy the problem if possible Remove the sediment and stabilize or dispose of it in a location where it will not cause impacts to streams or the BMP Erosion has occurred Provide additional erosion protection such )t.t ant; 2 ob a rn as reinforced turf matting or riprap if needed to prevent future erosion problems Weeds are present Remove the weeds preferably by hand If a pesticide is used wipe it on the plants rather than spraying Form SW401 Sand Filter 0 &M Rev 4 2009Sept17 ? i Page 1 of 3 BMP element- Potential problem How I will remedlate the problem. Filter bed and underdraii Water is pondmg on the surface for Check to see if the collector system is collection system more than 24 hours after a storm clogged and flush if necessary If water still ponds remove the top few inches of filter bed media and replace If water still onds then consult an expert Outlet device Clogging has occurred` Clean out the outlet device Dispose of the at sediment offsite The outlet device is damaged Repair or replace the outlet device Receiving water Erosion or other signs of damage Contact the NC Division of Water Quality have occurred at the outlet 401 Oversight Unit at 919 733 1786 Li Fonn SW401 Sand Filter O &M Rev 4 2009Sept17 Page 2 of 3 Permit Number (io be provided b) DNVQ) I acknowledge and agree by my signature below that I am responsible for the performance of the maintenance procedures listed above I agree to notify DWQ of any problems with the system or prior to any changes to the system or responsible party Project name Bryton, Hambrtght Road Water Quality BMP di ainage area number Sand Filter #1, (West Basin) Print name Mr Paul Herndon Tale Vice President, Bryton Corporate Center LP Address 3700 Arco Corporate Drive, Suite 350 Charlotte, NC 28273 PI 0 Date __ _ /0 - oly -ff Note The legally responsible party should not be a homeowners association unless more than 50% of the lots have been sold and a resident of the subdivision has been named the president I Lo/"r A �U'Mu� a Notary Public for the State of /�% r�arolidlG�, County of do hereby certify that �dtGt� l�ft�an personally appeared before me this JD' day of i�C.�o�t.✓ o1f� // , and acknowledge the due execution of t forgoing sand filte maintenance requirements Witness my hand and official seal s rn 0 Got SEAL My commission expires 1,44g 1 Form SW401 Sand Filter O &M Rev 4 2009Sept17 Page 3 of 3 Permit Number (to be pi ovided by DTYQ) Drainage Area Number Dry Extended Detention Basin Operation and Maintenance Agreement I will keep a maintenance record on this BMP This maintenance record will be kept to a log m a known set location Any def }cient BMP elements noted in the inspection will be corrected repaired or replaced immediately These deficiencies can affect the integrity of structures safety of the public and the removal efficiency of the BMP The dry extended detention basin system is defined as the dry detention basin outlet structure pretreatment including forebays and the vegetated filter if one is provided This system (check one) ® does ❑ does not This system (check one) ❑ does ❑ does not incorporate a vegetated filter at the outlet incorporate pretreatment other than a forebay Important mamtenance procedures — The dramage area will be managed to reduce the sediment load to the dry extended detention basin — Immediately after the dry extended detention basin is established the vegetation will be watered twice weekly if needed until the plants become established (commonly six weeks) s.,, JAN ,l — No portion of the dry extended ,dgterrtipn pond will be fertilized after the first mitial fertilization that is required to establish the vegetation — I will mamtam the vegetation m and around the basm at a height of approximately six mches — Once a year a dam safety expert will inspect the embankment After the dry extended detention basin is established it will be inspected once a quarter and within 24 hours after every storm event greater than 10 inches (or 15 inches if in a Coastal County) Records of operation and maintenance will be kept m a known set location and will be available upon request Inspection activities shall be performed ap follows Any problems that are found shall be repaired immediately BMP element- Potential problem How I will reme&ate the problem The entire BMP Trash debris is present Remove the trash debris The perimeter of the dry Areas of bare soil and /or Regrade the soil of necessary to extended detention erosive gullies have formed remove the gully and then plant a basin ground cover and water untrl it is established Provide hme and a rtr one time fertilizer apphcation Form SW401 Dry Detention 0 &M Rev 3 Page 1 of 4 (r 1ti < BMP element- Potential problem How I will remediate the problem The inlet device pipe or The pipe is clogged (if Unclog the pipe Dispose of the swale applicable) sediment off site The pipe is cracked or Replace the pipe otherwise damaged (if applicable) Erosion is occurtmg in the Regrade the swale if necessary to swale (if applicable) smooth it over and provide erosion control devices such as reinforced turf matting or riprap to avoid future problems with erosion The forebay Sediment has accumulated Search for the source of the and reduced the depth to 75% sediment and remedy the problem if of the original design depth possible Remove the sediment and (see diagram below) dispose of it in a location where it will not cause impacts to streams or the BMP Erosion has occurred or Provide additional erosion riprap is displaced protection such as reinforced turf E matting or riprap if needed to prevent future erosion problems Weeds are present Remove the weeds preferably by hand If pesticides are used wipe them on the plants rather than spraying The main treatment area Sediment has accumulated and reduced the dept to 75 A Search for the source of the sediment and remedy the problem if of the on � mal design depth (see diagrat€n �e1�gw) possible Remove the sediment and dispose of it in a location where it will not cause impacts to streams or the BMP Revegetate disturbed areas immediately with sod (preferred) or seed protected with securely staked erosion mat Water is standing more than Check outlet structure for clogging 5 days after a storm event If it is a design issue consult an appropriate rofessional Weeds and noxious plants are Remove the plants by hand or by growing in the main wiping them with pesticide (do not treatment area s ra � t s Form SW401 Dry Detention O &M Rev 3 Page 2 of 4 t r r y BMP element Potential problem How I will remediate the rrobIem The embankment Shrubs or trees have started Remove shrubs or trees to grow on the embankment immediately Grass cover is unhealthy or Restore the health of the grass cover eroding consult a professional if necessary Signs of seepage on the Consult a professional downstream face Evidence of muskrat or Use traps to remove muskrats and beaver activity is present consult a professional to remove beavers An annual inspection by an Make all needed repairs appropriate professional shows that the embankment needs re air The outlet device Clogging has occurred Clean out the outlet device Dispose of the sediment off site The outlet device is damaged Repair or replace the outlet device The receiving water Erosion or other signs of Contact the NC Division of Water damage have occurred at the Quality 401 Oversight Unit at 919 outlet 7331786 The measuring device used to determine the sediment elevation shall be such that it will give an accurate depth reading and not readily penetrate into accumulated sedunents When the basin depth reads 734 28 feet in the main pond the sediment shall be removed t J} ` ` 11 III to i When the basin depth reads 734 28 feet in the forebay the sediment shall be removed Sediment Removal EN 734 28 Bottom ElevatiX 733 5 FOREBAY BASIN DIAGRAM (fill in the blanks) I n 1 E C L,t r f25 r Pool ume Sedunent Storage t S 18 r t �t Temporary Pool Elevation 736 60 Sediment Removal Elevation 734 28 Bottom Elevation 733 5 MAIN POND Form SW401 Dry Detention O &M Rev 3 Page 3 of 4 Volu 25% Permit Number (to be pi ovided by DTVQ) I acknowledge and agree by my signature below that I am responsible for the performance of the maintenance procedures listed above I agree to notify DWQ of any problems with the system or prior to any changes to the system or responsible party Project name Bryton, Hambright Road Water Quality BMP drainage area number Ext Dry Pond #1 (East Basin) Print name Mr Paul Herndon Title Vice President, Bryton Corporate Center LP Address 3700 Arco Corporate Drive, Suite 350 Charlotte, NC 28273 Phone Signature Date /0 OU - �/ Note The legally responsible party should not be a homeowners association unless more than 50% of the lots have been sold and a resident of the subdivision has been named the president I �D/`( d 4 4 U`el ( , a Notary Public for the State of A)Or7'h &1621616_ County of Vecdeli La , do hereby certify that �luc� �Gr,�civn personally appeared before me this 'J0 day of cloll and acknowledge the due execution of the forgoing dry detention basin maintenance requirements Witness my hand and official sea], 'u' 6-1011- �' CIrAlhe • • V • G "SURG,G ®,•'• SEAL rol F t My commission expires Form SW401 Dry Detention 0 &M Rev 3 L u,u i Page 4 of 4