HomeMy WebLinkAboutRC 20230327000659 Instrument Number: 20230327000659 Document:COV Rec: �215.50 Page-1 of 13
Record Date:3/27/2023 3:12 PM
Electronically Recorded King County,WA
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Instrument Number: 20230327000G59 Document:COV Rec: $215.50 Page-2 of 13
Record Date:3/27/2023 3:12 PM King County,WA
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Instrument Number: 20230327000G59 Document:COV Rec: $215.50 Page-3 of 13
Record Date:3/27/2023 3:12 PM King County,WA
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Instrument Number: 20230327000G59 Document:COV Rec: $215.50 Page-4 of 13
Record Date:3/27/2023 3:12 PM King County,WA
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SCALE IN FEET Page 4 of 13
Instrument Number: 20230327000G59 Document:COV Rec: $215.50 Page-5 of 13
Record Date:3/27/2023 3:12 PM King County,WA
MAINTENANCE INSTRUCTIONS FOR A RAIN GARDEN
Your property contains an on-site BMP (best management practice) called a"rain garden,"which was
installed to mitigate the stormwater quantity and quality impacts of some or all of the impervious or
nonnative pervious surfaces on your property.
Rain gardens include vegetated closed depressions (ponds)that retain and filter stormwater from an
area of impervious surface or nonnative pervious surface on your property. The soil in the rain garden
has been enhanced to encourage and support vigorous plant growth that serves to filter the water and
sustain intiltration capacity. Depending on soil conditions,the rain garden area may have water in it
throughout the wet season and may overflow during major storm events. This on-site BMP shall be
maintained per Appendix A of the City of Renton's Surface Water Design Manual.
MAINTENANCE RESTRICTIONS
The size, placement, and design of the rain garden as depicted by the site plan and design details must
Ue maintained and may not be changed without written approval from the City of Renton or through a
firture development pei-mit from City of Renton. Plant materials may be changed to suit tastes,but
chemical fertilizers and pesticides must not be used.
INSPECTION FREQUENCY AND MAINTENANCE GUIDELINES
• Rain gardens must be inspected annually for physical defects and sediment accumulation.
• Rain gardens have inflow and overflow inlets and outlets. These need to be maintained to
ensure that water is moving into and out of the rain garden. Check inlets/outlets for
debris/sediment blockage,bare spots (exposed soil), or other signs of erosion damage(soil
movement). Remove debris and obstt�ictions as necessary.
• After major storm events,the system should be checked to see that the overflow system is
working properly and scdimentation is not occtitri-ing at thc inlet. If crosion damage or bare
spots are evident,they should be stabilized with soil,plant matei�ial, mtiilch, or landscape rock.
Sediment deposits shotiild be carefi.tlly removed and the sediment sotiirce eliminated.
• Plants must be adapted to wet winter conditions and dry summer conditions. Vegetation is to
be watered and pruned as needed.
• Frequent watering is required to keep the plants healthy:
o Year 1: weekly,
o Year 2: bimonthly,
o Year 3: bimonthly,
o Year 4 &beyond: as needed for established plantings and dry periods.
• Chemical fertilizers and pesticides must not be used.
• Soil must be replaced in areas where sediment accumulation is preventing adequate infiltration
of water through the soil.
• Compacted soil should be decompacted.
• Trash and debris must be removed often from the rain garden depression.
Page 5 of 13
Instrument Number: 20230327000G59 Document:COV Rec: $215.50 Page-6 of 13
Record Date:3/27/2023 3:12 PM King County,WA
• Mulch must be applied to bare soil at a minimum of 2 inches to maintain healthy growth.
• Compost may be added if soil nutrients are no longer adequate to support plant growth.
• Vegetation should be maintained as follows:
1) Replace all dead vegetation as soon as possible;
2) Remove fallen leaves and debris as needed;
3) Remove all noxiotiis vegetation when discovered;
4) Manually weed without herbicides or pesticides;
5) To protect infiltration performance, do not compact soils in the bioretention cell with heavy
maintenance equipment and/or excessive foot traffic;
6) Dui-ing drought conditions,use mulch to prevent excess solar damage and water loss.
RECORDING REQUIREMENT
These rain garden on-site BMP maintenance and operation instructions must be recorded as an
attachment to the required declaration of covenant and grant of easement per Requirement 3 of
Section C.1.3.4 of the City of Renton Surface Water Design Manual. The intent of these instructions is
to explain to future property owners,the purpose of the BMP and how it must be maintained and
operated. These instnictions are intended to be a minimum;the City of Renton may require additional
instructions based on site-specific conditions. See the City of Renton's Surface Water Design Manual
website for additional infoi-mation and updates.
Page 6 of 13
Instrument Number: 20230327000G59 Document:COV Rec: $215.50 Page-7 of 13
Record Date:3/27/2023 3:12 PM King County,WA
T'YPiCAL 12ATN GARDEN(SPILLWAY OR C,�TCH BASTN OITTLET)
ROCKED SPILLWAY,2'Wx4'L
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LONGER),OVERFLOW TO A � VEGETATED
SU ITABLE DISCHARGE AREA COMPACTED
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w ,. . . W W W W � �.
� „�, �TREES,SHRU1� � � = y�
a: � � � �r, ,�.
�BIORETENTION AREA
<�. �„ I1 u�%�:'J � �,p �r'
�4 ` � _ GROUND COVER / �"� '�"
�*^ �aMr„ ^� o1P�
w.� w�. �,Yu .. mo-. ,��,, war«
� aaa� „�. ..�. ,s�, a�,N aaw, .waa u� .� �«� � .a+�. ab.� ,�r^^ a�r
PLAN VIEW A
NTS
TREES TREES
6"MIN FREEBOARD
ABOVE OVERFLOW WS
TO TOP OF BERM OR
ADJACENT ROADWAY
�� GROUND SHRUBS �� 2�MIN TOP WIDTH
COVER ° ii _ �
'�/�'/�//\,/V ' � �
��o �+
�
�,\r\,`�\\ \ ,
/.�i��'�� �/���/i�/./s�V�.j'tA�h� �`��`.;��.�,�.. .���"'/.�, � �OVERFLOW TO
6"MIN TO 12'MAX MAX SLOPE 3H:1V BELOW J SUITABLE SURFACE
WATER DEPTH OVERFLOW WATER DISCHARGE AREA
SURFACE ELEVATION(TYP.)
BIORETENTION COMPACTED EARTH
SOIL MIX PER BIORETENTION AREA BERM(AS NEEDED)
REFERENCE 11-C,
MIN.18"DEPTH
SECTION A-A
NTS
CATCH BASIN A
w/GRATE ` � 4"RIGID PIPE OUTLET
'� '� � `�" � ��' ��"" � �' ��' `�` TO STORM SYSTEM
�. ww > �:
VEGETATED
� ��" `�� COMPACTED
� 4 W W 4 � 4 W W 4 ,� �. EARTH BERM,
,�� �� /TREES,SHRUBS � � TOP WIDTH
� �'�j� a�+� 2'M I N
�: � `�y`�J � ,�. �..
BIORETENTION AREA
� ,� � �� � ��
� '"" \� _ GROUND COVER �> ""�^
�, � � ��.
�: ^�« .w� . , »�« .ww �
�c„ ..�. �„� .�m. ,y�..� ..��, �„ ..�u, y�, ..� � u�, .�x.. ..vu� .�m� vc
PLAN VIEW A
NTS
Page 7 of 13
Instrument Number: 20230327000G59 Document:COV Rec: $215.50 Page-8 of 13
Record Date:3/27/2023 3:12 PM King County,WA
MAINTENANCE INSTRUCTIONS FOR BASIC DISPERSION
Your property contains an on-site BMP (best management practice) called"basic dispersion,"which
was installed to mitigate the stormwater quantity and quality impacts of some or all of the impervious
surfaces or non-native pervious surfaces on your property.
Basic dispersion is a st�ategy for utilizing any available capacity of onsite vegetated areas to retain,
absorb, and filter the ninoff from developed surfaces. This on-site BMP has two primary components
that must be maintained:
(1) The devices that disperse runoff from the developed stitrfaces and
(2) The vegetated area over which runoff is dispersed.
Dispersion Devices
The dispersion devices Ltsed on yotitr property include the following as indicated on the site
plan(CHECK THE BOX(ES) THAT APPLY):
❑ splash blocks, ❑ rock pads, ❑ gravel filled trenches, ❑ sheet flow.
MAINTENANCE RESTRICTIONS
The size,placement, composition, and downsh eam flowpaths of these devices as depicted by the site
plan and design details must be maintained and may not be changed without written approval from the
City of Renton or through a future development permit fi-om the City of Renton.
INSPECTION FREQUENCY AND MAINTENANCE GUIDELINES
This on-site BMP has two primary components that must be maintained per Appendix A of the City of
Renton's Surface Water Design Manual:
(1) The devices that disperse runoff from the developed surfaces and
(2) The vegetated flowpath area over which runoff is dispersed.
Maintenance of Dispersion Devices
• Dispersion devices mtiist be inspected annually and after major storm events to identify and
repair any physical defects.
• When native soil is exposed or erosion channels are present,the sources of the erosion or
concentrated tlow need to be identified and mitigated.
• Concentrated flow can be mitigated by leveling the edge of the pervious area and/or realigning
or replenishing the rocks in the dispersion device, such as in rock pads and gravel filled
trenches.
Maintenance of Vegetated Flowpaths
• The vegetated area over which runoff is dispersed must be maintained in good condition free
of bare spots and obstructions that would concentrate flows.
Page 8 of 13
Instrument Number: 20230327000G59 Document:COV Rec: $215.50 Page-9 of 13
Record Date:3/27/2023 3:12 PM King County,WA
RECORDING REQUIREMENT
These basic dispersion on-site BMP maintenance and operation instructions must be recorded as an
attachment to the required declaration of covenant and grant of easement per Requirement 3 of
Section C.1.3.4 of the City of Renton Surf'ace Water Design Manual. The intent of these instructions is
to explain to future property owners,the purpose of the BMP and how it must be maintained and
operated. These instructions are intended to be a minimum;the City of Renton may require additional
instructions based on site-specific conditions. See the City of Renton's Surface Water Design Manual
website for additional information and updates.
Page 9 of 13
Instrument Number: 20230327000G59 Document:COV Rec: $215.50 Page-10 of 13
Record Date:3/27/2023 3:12 PM King County,WA
TYPICAL SPLAS�-TBLO�K TYPIC�L 10-�FOOT DISI'�RSIUN +
TRE�CH CROSS-SE�TIO�i
nousE A�a n,`C¢�����y.°��.+.,v......,..._...X�%1'�4 C1tC�tll
��p°�'4 �Cft�¢ '� j'�� ""*�
n � Gw
¢Y�*Q O� �$d �.�..�'�'�
aocF oowNSPouT a� a°�Cle ��G s° �..�� V.
a c��
"'_" —�-� �o . `G'��a a
v
�..,. f Mlf1 �po"t����� �-�»�.,,„,��
�.w. _„q"`gs�z d' °
t redn � � a �oa e°�u�.
n � ca�a' ,„i+ra'°.at+wvrw�ta�a�atk
1��'MIN.VEGETATED �4"�����1'j �;,�'b"�"�
FLOWPATH U�IDER �'U� �tl���p'�"��'
FULL DISPERSION, Ap4^��qn���,�5�"�5r��
SEESECTIONC2.13 � ♦��'^��'�,p�
..... ' '...8.°:,.R,
SPLASH �.,,„..„.,.'�.°�P�M'�M'"�,,..�
6LOCK
DOWNSPOUT
��\..� ____________ E%TEN90�I pCt,/�p�y �!n /�♦�
�FlF.lkw*!l A'"�!'a��.fl'N
�SPLASH BLOCK �—»....: .�..»,
SI�E VIEW
NTS
TYPICAT.;'DRI�'EWAI'APPLICA�TIO�T OF DISPERSI�N TREN�H��TD ROCK PAD '
. -' ;
;� Slot drain ;� Diagonel asphalt berm-2 to 4 incl�es�iigh '
,
, ,,� � `,
^��in .-:l ,,'�' 1 . �,.
�. ;� �r�.�_ �� � , ,� �
� . ��...1 ;.1' .�� ,�'.;
t �' �:'l. "" �'(�' f':
' 1..:, � � ,'.:1.. :,,^-^-^-^� /,' 1,',
1 . :':1 . .t;'. ..-,1;�,.
. ., . ��,�,� ., . ,,��� .
� �
. . _ .. . . ...... .
10-foot long-� � � f�''y�
dispersi9n�#rench "" >�' � �
r ��. 2-ft x 3-ft x 6-inch ,� Vegeta�d
____ .= crushed rock pad.�� q� Flowp�th Segment
y,, m
_- ,-'
-- '" , ,
-" Edge of undisturbed':w '� `
� � �f.,...
native vegetation �.. ;
m R.
'"` 50-foot separation bet�N'een
flowpath segment�
.
Vegetated Flowpath � %
Segment(NVFS) � �
PLAN VIEW OF DRIVEWAY
NTS
Page10of13
Instrument Number: 20230327000G59 Document:COV Rec: $215.50 Page-11 of 13
Record Date:3/27/2023 3:12 PM King County,WA
MAINTENANCE INSTRUCTIONS FOR LIMITED INFILTRATION
Your property contains an on-site BMP (best management practice) called"limited infiltraZion,"which
was installed to mitigate the stormwater quantity and quality impacts of some or all of the impervious
surfaces on your property.
Limited infiltration is a method of soaking runoff from impervious area(such as paved areas and roofs)
into the ground. Infiltration devices, such as gravel filled trenches, drywells, and ground suiface
depressions, facilitate this process by putting runoff in direct contact with the soil and holding the
runoff long enough to soak most of it into the ground. To be successful,the soil condition around the
infiltration device must be able to soak water into the ground for a reasonable number of years. This
on-site BMP shall be maintained per Appendix A of the City of Renton's Surface Water Design
Manual.
Infiltration Devices
The infiltration devices used on yoLir property include the following as indicated on the site
plan(CHECK THE BOX(ES) THAT APPLY):
❑ gravel filled trenches, ❑ drywells
MAINTENANCE RESTRICTIONS
The size,placement, and composition of these devices as depicted by the site plan and design details
must be maintained and may not be changed without written approval from the City of Renton or
through a future development pernlit from the City of Renton.
INSPECTION FREQUENCY AND MAINTENANCE GUIDELINES
To be successful,the soil condition around the infiltration device must be able to soak water into the
ground for a reasonable number of years.
• Infiltration devices must be inspected annually and after major storm events to identify and
repair any physical defects.
• Maintenance and operation of the system should focus on ensuring the system's viaUility by
preventing sediment-laden flows from entering the device. Excessive sedimentation will result
in a plugged or non-functioning facility.
• If the infiltration device has a catch basin, sediment accumtiilation must be removed on a yearly
basis or more frequently if necessary.
• Prolonged ponding around or atop a device may indicate a phigged facility. If the device
becomes plugged,it must be replaced.
• Keeping the areas that drain to infiltration devices well swept and clean will enhance the
longcvity of these dcviccs.
• For roofs,frequent cleaning of gutters will reduce sediment loads to these devices.
Page 11 of 13
Instrument Number: 20230327000G59 Document:COV Rec: $215.50 Page-12 of 13
Record Date:3/27/2023 3:12 PM King County,WA
RECORDING REQUIREMENT
These limited infiltration on-site BMP maintenance and operation instructions must be recorded as an
attachment to the required declaration of covenant and grant of easement per Requirement 3 of
Section C.1.3.4 of the City of Renton Surf'ace Water Design Manual. The intent of these instructions is
to explain to future property owners,the purpose of the BMP and how it must be maintained and
operated. These instructions are intended to be a minimum;the City of Renton may require additional
instructions based on site-specific conditions. See the City of Renton's Surface Water Design Manual
website for additional information and updates.
Page 12 of 13
Instrument Number: 20230327000G59 Document:COV Rec: $215.50 Page-13 of 13
Record Date:3/27/2023 3:12 PM King County,WA
I�TFiT,'CRATTC)N TRE�TCH AND DRYWELL SYSTEMS
4"RIGID OR 6" CB SUMP w/SOLID LID �ROOF DRAIN
FLEXIBLE
PERFORATED
PIPE
'_________ _____________________
I'� _____ 1 �
i
i �
i
INFILTRATION TRENCH
PLAN VIEW
NTS
TRENCH SETBACK FROM ROOF DRAIN
BUILDING AS REQUIRED,
15'MIN.
OVERFLOW
SPLASH BLOCK
4"RIGID OR 6"FLEXIBLE
PERFORATED PIPE
A
6„ ,� ���, � !.�.. .� ,. .�✓
6° ��E� -'; �
�� 1'MIN
�2" WASHEDROCKI;"-j' 1'MIN.
.'_ _________________.�.' ' '
�A � SETBACK
VARIES FROM
BUILDING
FINE MESH 5'MIN.
SECTIONVIEW SCREEN CBSUMPw/SOLIDLID
NTS
rCOMPACTED BACKFILL
I FILTER FABRIC
/
�/�. ,.�,,,�, '.
i�\ � ����\�;
�'�'�.
�,
24"� 7i�n�.d�
��" , 4"RIGID OR 6"FLEXIBLE
� �p�� �� . , � '�;� PERFORATED PIPE FROM ROOF�
� �.,�'4�����" 1�"-�q"WASHEDROCK
MIN.1'ABOVE SEASONAL �� ������
HIGH GROUNDWATER z4 �
TABLE,SEE SECTION G222
� SECTION A GRASS
� NTS
MARKCENTEROFHOLE =VERFLO� �� /�
RnnF��)WNCPOUT WITH1"CAPPEDPVC , ����\\ � .\�.\�.\�.\�i��
OROTHERMIEANS // 6"MIN.
OVERFLOW FLUSH W ITH SURFACE ��� � ��� �
SF'LASH BLOCK TOPSOIL 3/4"TO 1-1/[' �\
House WASHED DRAIV ���� 18"MIN. �
ROCK /�� �
'. 1'MIN_ � -
F�ow MIN.1'ABOVE 15'MIN.AS
SEASONAL HIGH REQUIRED,
5'MIN.SETBACK � 2'MIN. SEE C.2.2.3
FROMBUILDING� MIN.4"DIA. GROUNDWATER
Pvc Piae TABLE,SEE
FINE MESH SCREEN SECTION C2.22
a31NCHOIwmETER VAr�IE� X-SECTION
SIGESOFHOLE HOLEFILLEDWITH '
CATCHBASIN LINEDWITH �Y�-3"WASHED NTS
(VARDDRAIN) FILTERFABRIC f1RAINRnCK
15'Ivl iN.AS REpUIRED,SEE SECTION C.2 2 3 FI LTE R STRI P
miai.rnaovesensan�n� SEE SECTIONS
wcn cRouNownTEa rna�E, GRASS 6.3.4 8,6.3.5
sec7ion sEE sECTioN r.z z.z Y
N7s � '� pRNE`N�
_OVERFLO� �j1'
✓ , ,�,�,��;��;��,�
� aoov \ 6"MIN. y\�\\���\��\��\��\��\��\�
i�i i i i i�i iT�i�i�i�����i�
uomisrom cnrcHensiN `\3/4/T011/2"\•\� \��\�j����/iQ//�\/,�\\���
HousE Fo 0
` �"�"� WASHED DRAIN �j� '18"MIN.
ROCK '.�,� � NOTE:
r�ow � SEE G22.3 FOR
aooF TRENCH LENGTHS,
oowms�wr M I N.1'ABOV E
� SEASONAL HIGH TRENGH SPAGING AND
GROUNDWATER 2'MIN. SITE LIMITATIONS
TABLE,SEE
PLAN VIEW SECTION C.2.2.2
NTs X-S ECTION
NTS
Page13of13