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I I I I I I I I I I l l l l L L L APPENDIX A PROBLEM AREAS DESCRIPTION

APPENDIX A PROBLEM AREAS DESCRIPTION I l L · out area could possibly be used for environmental mitigation. ... drainage system to the pothole area ... A -Problem Areas Description

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Page 1: APPENDIX A PROBLEM AREAS DESCRIPTION I l L · out area could possibly be used for environmental mitigation. ... drainage system to the pothole area ... A -Problem Areas Description

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APPENDIX A

PROBLEM AREAS DESCRIPTION

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PROBLEM AREAS DESCRIPTION

Problem No. 1

Location and Description

Problem No. 1 is located in a large pothole area located both north and south of 62"' st. E. between 187" St. and 189" St. The pothole fills during large volume stann events causing 62"' St. and 187·

Ave. (a private road) to be covered with water to the point of inaccessibility . Most years the pothole fills enough that standing water is visible in the low areas, but the water does Dot typically cover the roadway. Occasionally the water does rise to the point of covering 62nd St., blocking access to the house at the end of 62'" St. In 1992 62"" St. was raised on rock fill and a 36" storm pipe was installed as part of a resurfacing project. The storms of December 1996 and January 1997 caused the water to rise 4.5 feet above the new roadway elevation. Vehicle access was eliminated for several months until the water level dropped to the roadway elevation.

Although a pump could be installed in Pothole I to pump runoff out of the basin and into Lake Tapps, it will not solve all of the flooding problems. The pump will serve to evacuate the water much quicker than just relying on infiltration and evaporation. which is the only way currently for water to exit the basin. However, it will not keep the road from being covered for a short time period during very large storm events. Other efforts must be made within the basin to store or divert nmoff before it gets to the pothole. Development within the basin should be required to release runoff more slowly than pre-development rates to prevent exacerbating the problem. Particular attention should be given to the very large volume storm events because small volume high intensity events do not fill the pothole. This effort should be basin wide and not be limited to the City limits. Therefore, a policy of cooperative plan review should be implemented by the City of Bonney Lake and Pierce County. This is especially important since several of the mitigation opportunities and over half of the basin area lie withiu the County rather than in the City.

The Pothole 1 basin geology was reviewed based on an available soils report for the Lakeridge Junior High School site. A series of test pits and test borings were made in 1979 for the soils report prepared by Grover C. Way, P.E. on the storm drainage system at Lakeridge Junior High School. The soils consisted of a surface mantle of coarse-grained granular outwash soils, underlain by Vashon Glacial Till. The surface layer is a mixture of sands, gravel and cobbles in a loose condition. This layer is very permeable and ranges from a couple of feet to 20 feet thick. Below the outwash layer is a layer of V ashon Glacial Till. This material is a well-graded mixture of soils ranging from silts to boulders in size. Having been glaciated, it is normapy very dense, and is commonly cemented. The permeability of the till is very low compared to that of the outwash layer. The till depth went beyond the depth of exploration; it is commonly over 30 It thick.

Possible Solutions

• Raise 62nd St. where it crosses the pothole (approx. 200' long). This solution only solves one problem, access to the house at the end of 62nd. St.. The private access road inundation problem will not be solved and the house that almost flooded could be affected in a larger (higher runoff volume) event. As development increases in the basin, the roadway would

September, 2000 City of Bonney Lake Page A-I Appendix A - Problem Areas Description

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probably need to be raised again. This solution cost is too high for the limited benefit it produces. Pump over the hill and into an improved drainage system along 64· St. and into Lake Tapps. This solution will benefit all area in the basin at risk of being flooded. The pump station would not be able to completely eliminate flooding in the pothole, but it would be a reliable mechanism for evacuating impounded water relatively quickly.

• Construct an access driveway to the isolated house at the end of 6211(\ St. through an easement from 189· Ct. This would be a temporary fix to the problem at best. It does not address the full problem in the basin.

• Build additional storage elsewhere in the basin. This solution should be evaluated in more detail. Storage in the basin is a necessary part of any solution option. At a minimum, storage ponds with infiltration should be used to attenuate the flow to the pothole and to utilize the natural storage within the outwash soils. The geology oftbis basin is such that the infiltrated water will penetrate about 10 feet before it hits the low permeability till and moves horizontally towards the pothole at the low point of the basin. To build enough storage volume throughout the basin to eliminate the flooding would be prohibitively expensive, but storage could be used in conjunction with other options.

• Divert some of the runoff out oftbe basin. This option was looked at closely because it would be cost effective if flows could be directed out of the basin by gravity before entering the pothole: From preliminary review in this plan, no locations were found where a significant volume of water could easily be diverted from the pothole.

A riser inlet on the pipe on the west side of Myers Rd. could be installed, creating stormwater storage. The depression fonned where the ravine intersects the road fill is a logical place to store water. During site investigation, there did not appear to be any structures that were in danger of flooding if the inlet was raisad a few feet. A survey of the site should be completed to verify that no structures would be affected.

A storage pond site exists adjacent to the ditch line that discharges flows from the county development in the northwest comer of the basin (subarea 1) to Pothole I . Additional storage could be provided with a dedicated detention pond that would attenuate the peak flows and would improve water quality by encouraging sedimentation and infiltration.

Pothole 1 basin solutions need to provide longer term storage because the current detention facilities store water for shorter duration storms, which serves to reduce the peak flow but does very little to reduce the volume offlow to the pothole. In order to significantly reduce the volume within the time it takes the pump station to evacuate runoff, storage facilities should be designed to store water for a longer period (I week or beyond).

The most significant management practice that can be implemented in the PH 1 drainage basin is to retain pervious area vegetative cover. As the area of impervious surface increases, the runoffvolume will increase. The peak flows can be adequately controlled by storage with slow release, but the total runoff volume will be increased. Pothole flooding problems are usually volume problems. Attenuating the flow from large stonn events does little for pothole flooding problems because the water will eventually flow to the low point in the basin. Retaining native soils with mature forest cover is the best way to reduce runoff volume. Replanting of disturbed areas also helps reduce volumes, but to a much lesser degree. The City of Bonney Lake should consider requiring a

September, 2000 City of Bonney Lake PageA-2 Appendix A - Problem Areas Description

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minimum set aside of forested land on development sites within a pothole drainage area. This

r. should be structured consistent with requirements of a revised sensitive areas ordinance.

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Problem No. 2

Location and Description

Problem No, 2 is located in a pothole at the northeast comer of Locust Dr. and 82"" St. This pothole is a portion of a larger pothole that bas been segmented by the Locust Dr. roadway fill and extends east of Locust Dr. just north of 82"', During large storm events the pothole fills, flooding 82'" St. Infiltration is relatively slow, with the pothole draining in a month to a few months, according to City staff, In the past the City pumped flood water up 82'" and into the sanitary sewer system (no longer permitted), In January of 1997 with pumps running around the clock for a week the water was kept just at the elevation of 82nd St. Sand bags kept the water from affecting a house on the south side of 82M St.

Possible Solutions

• Install a small (1·2cfs) pump station to pump water up 82'" St. to the east, then down an access road to the north on the east side of the school. Here the water could be discharged to flow overland into the Bonney Lake overflow channel or be stored in a storage pond adjacent to Bonney Lake Elementary, This option would require hydrologiclhydraulic analysis of the receiving basin to determine the possible effects of this diversion.

• Create additional storage elsewhere in the basin. This pothole drains in about a month, so it may be possible to utilize added storage elsewhere in the basin. An analysis of the subsurface geology in selected areas would be necessary to determine the feasibility of infiltration. The basin is small (only 54 acres), so a comparatively small amount of added storage with infiltration would help flooding at the pothole, Storage could also be created by benching out the pothole, creating extra storage within the pothole itself. This benched out area could possibly be used for environmental mitigation. A detailed survey of the area should be conducted to establish an accurate stage-storage curve for Pothole 4, and the relative elevations of adjacent roads, driveways and houses within the pothole area.

• Increase the depth of the pothole by raising 82"" St. by I ' to 1.5' , This option would reduce the frequency of roadway inundation by increasing storage capacity.

Problem No. 3

Location and Description

Problem No. 3 is located on 811t St. at 1 82nd Ave. 81'1 St. is a small cul-de-sac on the west side of 1 82nd Ave. that bas no drainage system. Stonnwater runoff sheet flows to the low point in the cul­de-sac, then down a driveway to a house on the north side of 81 It St. Some water also flows onto this property from 1 82'" St.

September, 2000 City of Bonney Lake Page A·3 Appendix A - Problem Areas Description

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Possible Solutions

• Improve the cul-de-sac drainage by installing curbs or berms to keep the water within the road ROW. At the low point install a catch basin on both sides of 81" St. Install a drainage system to the south that connects with the drainage system on 182Dd Ave. A survey is needed to confirm that the grade is sufficient to connect the cul-de-sac drainage to the 182m! drainage system.

• This alternative is similar to the above solution, but would install a drainage system to the pothole area to the north. Hydraulic analysis is needed to deterrnme whether tbepothole can accommodate this runoff diversion without causing affecting structures in that area.

Problem No. 4

Location and Description

Problem No. 4 is located on 96th St. at 204th Ave., in the Cedar View development. Nuisanceponding occurs on two properties. From field and topographic mapping review, it appears that this area is a naturally low-lying. Runoff flows a few hundred feet to the south and under Highway 410 to a wetland area just south of the Highway. Two houses and highway 410 are in the flow path, causing obstruction of runoff. This area stays wet for several months of the year because of the very low drainage gradient to the south.

Possible Solution

• Provide improved drainage through the properties to the south by obtaining drainage easements and improving conveyance facilities. Install a catch basin and pipe on the south side of 96th St. to collect/convey the water to 97th St. to the south. Improve the ditch or install a pipe along 204tb St. to convey that flow to the existing culvert across Highway 410. Hydrologic and hydraulic analyses would be need to detennine facilities sizes and elevations, and to verify that the existing culvert under Highway 410 is adequate.

This area has always been a local low area that collects water. The City of Bonney Lake has not caused these problems. This drainage problem should be addressed by the residents who are affected.

Problem No. 5

Location and Description

Problem No. 5 is located between 91 at St. and 92nd. St., in the Cedar View development. Nuisance ponding occurs on private property threatening to flood houses. No structures have been impacted in past events.

Possible Solution

According to City staff, this problem has been remedied. A pipe had become clogged with sediment, reducing its hydraulic capacity and causing the ponding. There have been no problems reported at

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this location since the City crew cleaned the pipe. More frequent drainage system maintenance may be needed to maintain the current function.

Problem No. 6

Location and Description

Problem No. 6 is located at 18214 9S· Loop. This property sits at the low point in the PH 10 drainage basin. Some ponding has probably always occurred at this location, even before any development in the area. Development has increased the impervious surface area within the basin causing increased runoff' volumes and ponding problems to worsen. Even during large storm events there is only a small amount of standing water.

Possible Solutions

• Pump runoff to 1841h drainage system • Pump runoff to nearby Sky Island storage pond • Construct infiltration gallery • Construct storage pond on vacant lot • Acquire undeveloped property

Ponding in this area could be alleviated by either pumping from low area or increasing infiltration. Because this problem is occurring on a private undeveloped lot , a solution for it is not included in the CIP (in accordance with City drainage policy).

Problem No. 7

Location and Description

Problem No. 7 is located on 109m St. just west of 193111 Ave. in Bonney Lake Manor. Ponding is reported to occur during most winters. Runoff impounds on l09ih St. causing an impediment to traffic and nuisance ponding. The problem has been attributed to an undersized and/or malfunctioning infiltration system. A City maintenance crew attempted to solve the problem in 1996 by adding 6" ADS pipe and one catch basin to connect the infiltration system to the nearest catch basin on 193n1 Ave. Apparently this has helped reduce the problem, but has not solved it.

The soils in this area are Everett Gravelly Sandy Loam, 6 to IS percent and Indianola Loamy Sand, 6 to 15 percent. These soils were fonned of sandy glacial outwash material on broad upland areas. The stonn drainage design of Bonney Lake Manor shows a typical infiltration system designed to a 25-year event standard, which was the County standard at that time. As in many areas of Bonney Lake, the permeable top layer of soil is typically only 3 to 4 feet deep. The permeable outwash layer is typically underlain by glacial till. In depression areas, water collects on the underlying till layer causing a perched water table. In these areas it is important to consider the infiltration rate of water through the till layer which is much less than that of the outwash layer. In areas where outwash soils are underlain by till, the lateral movement of groundwater is typically much larger than the vertical movement at the till layer interface.

September, 2000 City of Bonney Lake Page A-S Appendix A - Problem Areas Description

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Based on review of available infonnation, it is not clear whether the existing system in undersized, plugged, or whether infiltration is not feasible. in this location. A geotechnical analysis of the subsurface topography is needed to confirm the appropriate design solution.

Possible Solutions

• Excavate and replace the existing infiltration system. Control future siltation effects through more frequent maintenance.

• Install a larger infiltration system, adding an additional infiltration trench of equal size to the east would approximately double the infiltration area.

• Install an overflow drainage system convey excess runoff to a low point just north of 109th St., or to a lower infiltration system to the southeast on 193" St. Building a drainage system would be expensive and could move the problem rather than solving it. A hydrologic and hydraulic analysis would be needed to determine possible downstream effects of this alternative.

Problem No. 8

Location and Description

Problem 8 is located at the comer of 183M Ave. and 77th St. A low spot on the southeast comer lot fills with water causing nuisance ponding. No flooding of the structure or roadway has occurred. The area of inundation is adjacent to 77th St. The road embankment of 77th St. obstructs water from flowing toward Bonney Lake and causes ponding to occur.

Pierce County soils maps indicate surficial soils in this area are Alderwood Gravelly Sandy Loam. These soils are moderately well drained in the first 25 to 60 inches, and are typically underlain by glacial till. The water table is typically perched above the low-permeability till layer, but tends to drain laterally flow towards low· lying pothole areas.

Possible Solutions

• Install an infiltration system along the south side of77" St. adjacent to the ponding area. • Install a culvert across 77th St. to convey runoffJ.o Bonney Lake. The main issue with this

solution is that it could impact private property on the north side of 77th St. without full extension of the improved drainage system to the lake.

Problem No. 9

Location and Description

Problem 9 lies within a pothole located at 8311 184" St. During high volume storm events the pothole fills potentially affecting a house located at the low area. During the flooding ofJanuary 1997. water was pumped across 184111 S1. and into. another pothole. This pumping transferred water into the PH 4 drainage basin which also had flooding problems at the comer of Locust Dr. and 82'" St.

September, 2000 City of Bonney Lake Page A-6 Appendix A - Problem Areas Description

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The flooding problem does not originate on public property and Ibere is no flooding of public facilities. There has been inundation problems since the house was constructed, although none of the other occurrences were as severe as the 1997 event. After the 1997 event, the affected property owner constructed a system of pumps, tanks and infiltration trenches to reduce the flooding problem. Since that time, no problems have been reported.

Possible Solution

If problems are documented to persist, City should consider improvement of the ditch along 84· St. to 183'" Ave., installing a culvert under 84· St., and constructing a series of infiltration trenches along 183'" to Ibe soulb.

Problem No. 10

Location and Description

Problem 10 is located at 20201 Church Lake Dr. on the west side of the road. An undersized culvert that extends to Lake Tapps restricts flow and backs up water onto private prQperty. A ditch on the west side of Church Lake Dr. receives flow from two pipes as well as some surface runoff. Outflow from the ditch is currently through a 12-inch pipe that flows into a nearby catch basin. The 12-inch outfall pipe extends approximately 350 feet through Church Lake Park where it discharges into Lake Tapps.

Possible Solutions

• Install a parallel pipe through the park of adequate diameter to convey Ibe necessary peak . flow. A hydrologic/hydraulic analysis is needed to establish design flows and to confirm estimated pipe sizing needs. A larger catch basin will be needed to tie both outlet pipes to the existing drainage system.

'0 Remove the existing pipe and install a larger pipe that can convey the necessary peak flow. A larger catch basin may be needed to accommodate the larger pipe.

• Install either solution above, except that rather than installing pipe all the way to the lake, daylight the pipe in the park and construct an open channel conveyance section.

September, 2000 City of Bonney Lake Page A·7 Appendix A - Problem Areas Description

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CITY OF BONNEY LAKE

I STORMWATER POLICY

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CITY OF BONNEY LAKE STORMW ATER POLICY

Policy Objectives

The City ofBonney Lake does not attempt to control 1 00 percent of the stormwater that falls within the City Limits. We do the following:

1. Minjmize the stormwater impacts from new development 2. Keep public roadways clear of stormwater for safety reasons 3. Maintain existing drain ways in public right-of -way and public easements 4. Provide supervision for private on-site improvements

Development

In August, 1996, the City adopted thePierce County Stormwater Management Manual as the official document to be used for stormwater management. The Manual requires that all new developments provide stormwater control for their developed area. The goal of this provision is to minimjze the amount of additional runoff resulting from development. This is accomplished by uaing various techniques such as infiltration, retention. detention or directional control into existing channels. Treatment of runoff water is also part of the requirements. Adoption of this manual was brought about by Department of Ecology requirements for improving the quality of waters draining into Puget Sound, and is enforced during the City's development review process.

Prior to adoption of the current manual, storm. systems were designed for 25-year events. The new standards require design for lOO-year events. All existing systems are grand-fathered into acceptance.

No system is designed to handle torrential dowopours of extreme intensity. Standing water and temporary inundation of stormwater systems is expected.

The City is not responsible for all water that falls inside the City limits. Ponding that occurs on private property in natural low-lying areas is the property owner's to deal with.

No homes are allowed to be constructed within the lOO-year flood plain as it is defined at the time of plan approval. This is a provision of the National Flood Insurance Program. This does not prohibit homes from being built in areas that may experience high water, such as inside a SOO-year flood plain boundary. The City cannot prevent homes from being built in wet areas, unless defined as a 100-year flood plain or a protected wetland. Property owners have the right to develop their property for its intended use.

Roadways

For the safety of the traveUog public, it is necessary that roadways be kept clear of standing water. For this reason, all roadways are designed with a slight crown to direct water from the traveling surface to the side of the roadway. At that point, it enters either aroadside ditch or storm drain catch basin.

City of Bonney Lake Page B-1

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Water contained in ditches and culverts travels toward the natural low point. Ditches and street and driveway culverts merely assist the runoff in reaching its natural destination. Public drainage facilities do not redirect water from its natural basin. To do so would require pumping.

In ditched areas, placing culverts and backfilling existing ditches is not allowed. Roadside ditches are necessary to receive and control roadway runoff. Any areas where ditches along theright-of�way have been tightlined may be removed by City crews at any time if necessary without compensation.

Do not make improvements along the right�of�way that force water to either remain on the paved. surface or run down the edge of the pavement. The former results in standing water on the roadway. the latter creates a destructive condition called edge raveling. Any such improvement must provide adequate drainage channels.

Paved road approaches create a direct connection between the draining road surface and the resident's driveway. Depending on the location of the road approach, this connection can become an outlet for roadway runoff. Anyone paving their road approach must be aware of this possibility. and shall make provisions for this in the road approach pavement grading and design.

Stormwater Utility

The Stormwater Utility provides for maintenance of existing drain ways and culverts. City crews maintain various public drainage easements throughout the City. These are existing natural drainage ways that route water to its normal destination. '

The City's Operations and Maintenance Department is continuously compiling a list of�esidential areas having stormwater problems. These areas may eventually become projects in a stormwater capital improvement plan. Residents may propose projects to be considered for the capital improvement plan.

In prioritizing the plan projects, each will be rated according to the following criteria:

1. How long the problem has existed 2. Recurrence frequency 3. Maguitude of affected area

A> this program is publicly funded, those projects that provide the greatest good for the greatest number, most frequently, will rate very high.

Supervision

Do not remove sewer cleanout caps in order to provide additional stormwater drainage. This is a violation of Bonney Lake Municipal Code Section 13.12.270.

There are areas, both developed and undeveloped, where stonnwater runoff flows across the property. It is the property owners responsibility to ensure that this water is allowed to continue flowing through its natural course, even after development.

September, 2000 City of Bonney Lake Page B-2 Appendix B - City of Bonney Lake Stormwater Policy

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Property owners cannot redirect surface runoff water onto a neighboring property without an agreement with the neighbor to do so. This type of issue is a civil matter between the two property owners.

September, 2000 City of Bonney Lake Page B-3 Appendix B - City of Bonney Lake Stormwater Policy

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I I' I" 1 I I ApPENDIX C

CIP PROJECT

I COST ESTIMATES

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City of Bonney Lake Stormwater Comprehensive Plan

Estimated Cost for CIP No. 1

Item Description

Pump Station Access Road Pumps (1000 gmf50 ft dynamic lift) Inlet Structure and Pump Housing Control Systems and Power Fencing

Conveyance System 1 O� HOPE Force Main 15" Drainage Pipe Improve Ditch Catch Basins Road Crossing/Restoration Outfall

Subtotal Mobilization (5.5%)

Subtotal Allowance for Undefined (10%)

Contingency ( 1 5%) Subtotal

Engineering/Administrative ( 1 5%) State Sales Tax (8.6%)

Easement Total

(Rounded)

Unit

LS EA LS LS LS

LF LF LF EA LS LS

Quantity

1 2 1 1 1

800 200 400

4 2 1

Page 1

Date: Revised 9/14/00 Project No.: 98-108

Client: Bonney Lake Field Name: BL Costs.xls

Unit Price

$6.000 $6.000

$20,000 $25.000

$2.000

$40 $40 $ 1 5

$1 .000 $4,000 $2,000

Extended Amount I $6.000

$12.000 $20,000 $25,000

$2,000

$32,000 $8,000 $6,000 $4,000 $8,000 $2.000

$125.000 $6.875

$131 ,875 $13,188 $19,781

$164,844 $24,727 $14.177 $1 0.000

$21 3,747 $21 5,000

Montgomery Water Group, Inc.

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City of Bonney Lake Stormwater Comprehensive Plan

Preliminary Cost Estimate for CIP No. 2

Item Description

Road Work Raise 82nd S1. E. by 1 foot Road Cuts

Drainage System Catch Basin 12- HOPE Drainage Pipe

Bench Excavation Excavation Revegitation

Subtotal Mobilization (5.5%)

Subtotal Allowance for Undefined (10%)

Contingency (15%) Subtotal

Engineering/Administrative (15%) State Sales Tax (6.6%)

Total (Rounded)

Unit Quantity

LF 1 00 EA - 1

EA 3 LF 60

CY 8070 SY 10000

Page 2

Date: Revised 9114100 Project No.: 98·106

Client: Bonney Lake Field Name: BL Costs.xls

Unit Price

$ 1 1 5 $1 ,000

$1 ,000 $50

$4 $3

Extended Amount I $ 1 1 ,500

$1 ,000

$3,000 $3,000

$32,280 $30,000

S80,780 $4,443

$85,223 $8,522

51 2,783 $1 06,529

$1 5,979 $9,161

$131 ,669 $1 32,000

Montgomery Water Group, Inc.

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City of Bonney Lake Stormwater Comprehensive Plan

Preliminary Cost Estimate for CIP NO. 3

Item Description

Conveyance System 12" Drainage Pipe Catch Basin

Roadway Improvements Shoulder Improvements

Subtotal Mobilization (5.5%)

Subtotal Allowance for Undefined (10%)

Contingency (15%) Subtotal

Engineering/Administrative (15%) State Sales Tax (6,6%) .

Total (Rounded)

Unit Quantity

LF 575 EA 3

LF 100

Page 3

Date: Revised 9/14/00 Project No.: 98·108

Client: Bonney Lake Field Name: BL Costs.xls

Unit Price

$48 $1 ,000

$10

Extended Amount I $27,600

$3,000

$1 ,000

$31,600 $1,738

$33,338 $3,334 $5,001

$41,673 $6,251 $3,584

$51 ,507 $52,000

Montgomery Water Group, fne.

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City of Bonney Lake Stormwater Comprehensive Plan

Preliminary Cost Estimate for CIP No. 4

Item Description

Infiltration System Trench System Manhole

Subtotal Mobilization (5.5%)

Subtotal Allowance for Undefined (10%)

Contlngency (15%) Subtotal

Engineering/Administrative (15%) State Sales Tax (8.6%)

Total "(Rounded)

Unit

LF EA

Date: Revised 9/14/00 Project No.: 98-108

Client: Bonney Lake Field Name: BL Costs.xls

Quantity Unit Price Extended Amount I

Page 4

100 $120 1 $1 ,600

$12,000 $1 ,600

$1 3,600 $748

$14,348 $1 ,435 $2,152

$17,935 $2,690 $1 ,542

$22,168 $23,000

Montgomery Water Group, Inc.

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Page 18: APPENDIX A PROBLEM AREAS DESCRIPTION I l L · out area could possibly be used for environmental mitigation. ... drainage system to the pothole area ... A -Problem Areas Description

City of Bonney Lake

r- Stonnwater Comprehensive Plan

r Preliminary Cost Estimate for CIP No.5 I

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Item Description

Collection System Catch Basin

Infiltration System Trench System

Subtotal Mobilization (5.5%)

Subtotal Allowance for Undefined (10%)

Contingency (15%) Subtotal

Engineering/Administrative (15%) State Sales Tax (8.6%)

Total (Rounded)

Unit

EA

LF

Date: Revised 9/14/00 Project No.: 98-108

Client: Bonney Lake Field Name: BL Costs.xls

Quantity Unit Price Extended Amount I

Page 5

1 $1 ,000 $1 ,000

50 $100 $5,000

$6,000 $330

$6,330 $633 $950

$7,913 $1,187

$680 $9,780

$10,000

Montgomery Water Group, Inc.

Page 19: APPENDIX A PROBLEM AREAS DESCRIPTION I l L · out area could possibly be used for environmental mitigation. ... drainage system to the pothole area ... A -Problem Areas Description

City of Bonney Lake Stormwater Comprehensive Plan

Preliminary Cost Estimate for CIP No 6

Item Description

Conveyance System 30" Pipe 24" Culvert Pipe Catch Basin, Type 2, 60 inch Dlam.

Subtotal Mobilization (5.5%)

Subtotal Allowance for Undefined (10%)

Contingency (15%) Subtotal

Engineering/Administrative (15%) State Sales Tax (8.6%)

Total (Rounded)

Unit

LF LF EA

Quantity

20 350

1

Page 6

Date: Revised 9f14/00 Project No.: 98·108

Client: Bonney Lake Field Name: BL Costs.xls

Unit Price

$80 $60

$3,000

Extended Amount I $1 ,600

$21 ,000 $3,000

$25,600 $1 ,408

$27,008 $2,701 $4,051

$33,760 $5,064 $2,903

$41,727 $42,000

Montgomery Water GrouP. Inc.

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Page 20: APPENDIX A PROBLEM AREAS DESCRIPTION I l L · out area could possibly be used for environmental mitigation. ... drainage system to the pothole area ... A -Problem Areas Description

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LAND USE TABULATION

Page 21: APPENDIX A PROBLEM AREAS DESCRIPTION I l L · out area could possibly be used for environmental mitigation. ... drainage system to the pothole area ... A -Problem Areas Description

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' f1"2 1t"2'0101CI'lI % % AGRICl.l.TlJRa I 4JII048 "*" 10.07 10.07 0.28 _TYPEOFCONIIENENCESTOf\EVt1'niGASAS PAI/oWn'FU 1 56114 i!o5<l'. 1.27 1.27 o.()( AA'TERIAL STREETS. .. 22'318 l1li284 0.5\ %.05 0.01 AIJTOLI08U PARKING. 1 2032 2032 0.05 0.05 0.110 AUTOIolO8IL! REP�R SERVICES. 1 tli571 0571 0..22 0.22 0.01 ElAN(JNG SERVICES. .. 35151 I� O.al 123 0.0$ EIARlIE!I.$ElMC£S. 1 m..l 272Q 0.113 0.83 0.02 BEAUTY SERVICES, 1 8245 8245 0.21 0.21 0.01 CASHIERS BOOTH I 27450 274&3 0.113 o.a 0.112 OtJRO£S.�AHCI TDIPI.U. 2 127312 2501744 2..112 1M 0.18 COFl'EE SI«JP/CAI'E. I ZWi3 2OOQ3 o.G 0.II1II 0.02 COIolMERCIALLANOwrn1 RES!DENCECALC1.l.ATED UNDellMlSCEU.NfeOU I 41111)4 4\8100' O.� 0.l1li 0.133 COMMERICAL LAND wttOI OOES NOT HAVE A BlADING VALUE BUT DOE e 2:Z223 111138 0.51 101 a.CIt COMMlIN'TY SHOPPING CENTet 1lEF. MANIW. 3 22ca30 m�17 5.18 IU7 0.44 CONVENIENT TO NEIGHBORHOOD SHOPPING CENTER; REF. w.MJAL I 720750 no7511 18." IUS 0.47 OAHOHG SCHdoLs. , 20303 2lI303 0.51 a.1S? 0.02

OESIGHA.TElfFORESt\..AND.'NEV£ROfAHGE nes USECOOE ��� ..,.:'C' ��l��hiDlT1� ��.u .; �I'&�lt .J"..tqa;}; DENTAL SEIMCES. 1 17922 l1i22 __ 0.4\ 0.4\ o.o�� OESIGAAruUSEFOROUPLEXIZF ....... Y lNTS� 15 :-',Qt.( r," 2� G.l7 .5.81 r"o.Il �nsUSEFOR FOlJRPl.EX (4'AAllI..Yurnsl 2 22278 � 0.51 1.02 0.03 OESlGAATES USE I;.OR.SINIXE FM'lLY'owaut«;;,�:�,:. 1'- .:.itf,:W�t"� .. 24-40:' '£21_� !. - " �·.cuo ��, iU21J.301 �q.�;::: tJ'..:-;iY!i.-r:: OAAlNFla.os.eo.TCH 8.o\SlNS. IN R£SIOENTW. OEVELOPMEHTa B 2e304 1571125 O.eo :1.112 0.10 DRlNKLNG PI...'CD (TAveRNS -"'-CCHOUCBEVERAGES� • 1 13_ 1� 0.32 0.:12 0.01

���Nf'GHl-���i��·SO:,�,"!'i2i.-� '. ;', ��f�:i.E�R��Et" ;\�� i:. �;=�� � 'Y!.��7S: 'j; .wY::;"j; �!:�", Ig>.f��

EXECI.ITlVE. I..EGISLA.T\VEMO.l1JDlCW. Fl.N:T1ONS. 2. 110115 22.OZ3O :z..5J 5.118 CU4 FloSTfOODRUTAIJRANTSICARRY.ouT. • � 11Il50<l 0.00 US flOS FMOI5IOAIoIOftE FAMlLYLNTS INON-SU6SIOlZEOIAPf'IWSEOBY 1 4IlII2.8 341185 1.12 1.85 CU2 G£NE.lW.WAAEl-tOUSlNGANOSTORAGE. 2 112528 l2SOM 1,44 2.11 0.01 GOVEJIHI,jENT","SERVICES 1 UI018 leo18 0.31 0.37 0.01 GREENBB.rs AND COMMON AREAS IN RESIDENTIAL AI\£I..S. 1 4203 413 0.10 0.10 0.00 GR�ES ('MTM OR 'MTHOUT MEAT). 3 106642 31mB 2.43 1.28 0.21 �ARe. I 115372. 111372 0.38 0.31 0.01 HIGHWAY AND STREET RlGHT-oF·WAY . 7 nilS 55423 r

",,:11 1.27 o.�;j\�' lD£NTV'lesTHClSE�ARCa.S OF I..N«I THATjJ{J: I.JND£VS.OPEOJlW.'.,;.""'���� �-;g.:.; �4cm.6Si&. ;::-�� ':'fll1",£ !J.�.IIO...� <;.!..::z;v: • I -5tZl

INSIJAANCf: CARRI ERS . 1 22e.5G 22e58 0.52 0.52 0.01 , _ _ t...I.KEs: �lUIW..·OA�SIZE�I!JCIE... � . .:..� <£i�"'.�S�¥�' J; .� .$1�".i: :;"2!100322. �.lB:-" "I."mzr..i\ -�5.eo.EI::z._¢:J.; I..ANOTHAT FOf'If.jERI..YKo\O OHEUlNG ORW06IlE HOMEONIT. • ... �..... 7 52037 _2«2 , -' 1.li' ·" ---1.311 0.24 I�""'-" USRAAJES. 1 M021 &402.1 U3 I.IIl 0.015 UQIJOR. I Z5031 2!O31 0.57 0.57 0.02 lOC'I.ACCESS STREaS. 1$ 71M 13&518 O.le 3.13 0.011 IolEDICALOJt-ICS.OUT ....... TlENT SEIMCB. 4 1)58.5 $QIQ 0.31 1.25 0.04 IoIIN-WAACHOUSE 1 38878 :181111 O.M! o.ai 0.03 IIlSCaI.ANE.DUS RETAIl. AND OFFICE SPACE. 2 0&2.530 UOt. 0." US 0.00 MOBLE HOMEtS1B.JMlNAllOHOfl1TU!i -- -� !">\�., .t,.�'" � " � 103 ' � 1S373.�; r'�--11 __ "'JI.38 _.:: � :'�3e."!'l<,'! �:oe·(4 '1�'l-!l8:; ::geTOn.;�IF��o���PERSOfW. PROPERTY � ';.I t . . • -;"' S�'-. ·" 4�S'" ' � ��>:f'. � ,-� � .',': 1:.': .. .;;,,"' .:: ... . ,,-'4.!2..�_ NURSERY SO«lOl.S. 1 .aa521 41521 1.11 1.11 0.03 OPEN OPEN SPACE ,GENERAL 1 p,.�"""

tIIll1000 11.n II.n �;.!,!_

OPENSPACEIANO:,FNW AND AIlRiCU.l1JRI:...i:.;':S;!,.: :;."�:"'�"..��':l"'WE·.;r.\ ;:l;'''r �1_3:1t iOM.,l0r.i,f O�,,�4.!II "" :;\!1i1e.�� :3�,-::; :�,'bjj'!l� ontER AUl"OMr091LE SERVICES (EXCEPT REPAIR AND WASW\. NOT ase 1 �81 25JIIl flY o.sa 0.02 OntCRMEDlCALANOI-lE"LTMSEiMCa. NOTB..SEWHEIIECOOEO. 1 1211&4 12e84 03 0.2$1 0.01 0"flER PAIlXS. NOT ELSEWHERECOOEO. I 1� l28CMO 2.il 1.81 O.oe OTHER PROFUSIOtw. SER'v1CES, NOT El..S£WHERE CODED. I 24eGC1 2... 0.57 0.57 0.02 OTHER REPAIR SERVICES. NOT £LSEY.tfERf: CODED. 1 27032 :rJI32 . 0." 0.14 0.02 OTHERRETAit. nv.oE.AIJTOtIOTlVE, MARlHECAAFT, AlRClW'TANOA 1 '18081 '1Il001 $.&0 UO 0.27 OntEFI. W"'TV\AREAS. NOT B.$EWHERECOOED. 1 em71 ewTl 16.04 le.c. 0.4l! PARKS I 1"23 14<Ul 0.33 0.33 0.01 I'I..AYGROUNOS. 2 4311873 81$146 10.10 20.20 0.57 I'OUCE PI'IOTECTION AND R8.ATalACTl'JlTlES. 1 le0a2 1Il0l2 0.41 0.41 0.01 I'05T"," SERVICES. I 211!1'22 am o.ee 0.&11 0.02 Pf'UMARV IB..aIENTARYlS01OOt.S. (GRADE. 1 Tl-RU8� 2 2<16545 4D)11(1 5.611 11.32 0.3:1 AAPlO AAL TAAHS/T AICI STREET AALW"'VAlGHf-Dl'-WAY. AEf. w.N 1 20030 2OC3O 0.46 D. 46 0.01 RE.o.LPROPERTY t«lTJJSEO FORHUMANKWT ... noN. l!EF. r.INIIJAL .... ..:. ...:-� "";;,�."" ,�·li:- , II ::_5II031�,i:! � 3B01<102 " � 1.30 '::;l12..6li$.1 �2.33§. ,e2.33� � R£S10EtmAL YACAHTLANO ltIAT HAS '" �R FUNCTlOtu..l. ORECOHO " - , . . 17 171132. _2 0.'1 7.00 0.20 REST"'URANTWI1lUAR. I 111137 111137 O.lT O.lT 0.01 TE...Ei'HONE EXCHANGe.ST ... TlONS. 1 02038 820311 1.42 1.42 O.c.

TlRES. IlATTE!lES ANO�RlES. 2 ", '2455 . . e.5]'ll _ �, O.III �. 1,07 ,_ -.,}.O!l:o::1 I, ... ,�,.-�]" UTUTlES. .• �" '"" 'J. - �. ... . ....... ..... ,'.;.,.·.·.�.l_.A •. _". =�� .. _'-.:.:.� :.--".�,<.·.:_·,,5 " J� Cb4742>� t-'2!lIlO ., .�I .. .st""· .l't..-�Os!" ... 'f�.?,,,"

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Page 22: APPENDIX A PROBLEM AREAS DESCRIPTION I l L · out area could possibly be used for environmental mitigation. ... drainage system to the pothole area ... A -Problem Areas Description

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Page 24: APPENDIX A PROBLEM AREAS DESCRIPTION I l L · out area could possibly be used for environmental mitigation. ... drainage system to the pothole area ... A -Problem Areas Description

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Page 25: APPENDIX A PROBLEM AREAS DESCRIPTION I l L · out area could possibly be used for environmental mitigation. ... drainage system to the pothole area ... A -Problem Areas Description

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Page 26: APPENDIX A PROBLEM AREAS DESCRIPTION I l L · out area could possibly be used for environmental mitigation. ... drainage system to the pothole area ... A -Problem Areas Description

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Page 27: APPENDIX A PROBLEM AREAS DESCRIPTION I l L · out area could possibly be used for environmental mitigation. ... drainage system to the pothole area ... A -Problem Areas Description

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I ApPENDIX E

PIERCE COUNTY MANUAL

I MAINTENANCE CHECKLIST

I I I f L L I I L L L L

Page 28: APPENDIX A PROBLEM AREAS DESCRIPTION I l L · out area could possibly be used for environmental mitigation. ... drainage system to the pothole area ... A -Problem Areas Description

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+ . . .

Inspection Period:

An ACHMENT nAn

MAINTENANCE PROGRAM COVER SHEET FOR PIERCE COUNTY

Number of Sheets Attached:

Date Inspected:

Name of Inspector.

Inspector's Signature:

J - 17

Page 29: APPENDIX A PROBLEM AREAS DESCRIPTION I l L · out area could possibly be used for environmental mitigation. ... drainage system to the pothole area ... A -Problem Areas Description

INSTRUCTIONS FOR USE OF MAINTENANCE CHECKLISTS

The following pages contain maintenance needs for most of the components that are part of your drainage system, as well as for some components that you may not have. Let the County know if there are any components that are missing from these pages. Ignore the requirements that do not apply to your system. You should plan. to complete .a checklist for all system components on the following schedule:

(1) Monthly from November through April. (2) Once in late summer (preferable September) (3) After any major storm (use 1-inch in 24 hours as a guideline), items marked "S" only.

Using photocopies of these pages, check off the problems you looked for each time you did an inspection. Add comments on problems found and actions taken. Keep these "checked" sheets in your files, as they will be used to write your annual report (due in May, for Pierce County Only). Some items do not need to be looked at every time an inspection is done. Use the suggested frequency at the left of each item as a guideline for your.inspection.

J - 18

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Page 30: APPENDIX A PROBLEM AREAS DESCRIPTION I l L · out area could possibly be used for environmental mitigation. ... drainage system to the pothole area ... A -Problem Areas Description

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ATIACHMENT"A"

MAINTENANCE PROGRAM

Maintenance Checklist for Closed Detention Systems (Pipesffanks)

Frequency Drainage ./ Problem Systems Feature

M Storage area Plugged air vents (small (pipe tank) pipe that QJfmects catch

basin to storage pipe)

M Debris and sediment

- . - .

A Joints between tank/pipe section

A Tank/pipe bent out of shape

M,S Manhole Cover not in place

A Locking mechanism not working

A Cover difficult to remove

A Ladder rungs unsafe

Conditions To Check For

One-half of the end atea of a vent is blocked at any point with debris and sediment. Plugged vent can cause storage lilrea to coDapse.

Accumulated sediment depth exceeds 15% of diameter. Example: 72· inch storage tank would require cleaning when sediment reaches depth of 10 inches

Any crack allowing material to leak into facility.

Any part of tank/pipe is noticeably bent out of shape.

Cover is missing or only partially in place. Arry open manhole requires maintenance.

Mechanism cannot be opened by one maintenance person with proper tools. Bolts into frame have less than 112·inch of thread (may not apply to self-kddng lids).

.

One maintenance person cannot remove lid after applying 80 pounds of lift.. Inlent is to keep cover from sealing off access to maintenance.

Maintenance person judges that ladder is unsafe due to missing rungs, misalignment, rust, or cracks. Ladder must be fixed or secured immediately.

Conditions That Shall Exist

Vents free of debris and seOimenl

All sediment and debris removed from storage area. Contact the County for guidance on seamen! removal and disposal.

All joints between tank/pipe sections are sealed.

Tank/pipe repaired or replaced to design. Contact a professional engineer for evaluation.

Manhole is closed.

Mechanism opens with proper tools.

Cover can be removed and reinstalled by one maintenance person.

Ladder meets design standards and allows maintenance persons safe access.

If you are unsure whether a problem exists, please contact a Professional Engineer.

Comments:

�: A = Annual (March or April preferred) M = Monthly (see schedule) S = After major stqrms (use 1·inch in 24 hours as a guideline)

J - 19

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ATIACHMENT "A" (CONTINUED)

Maintenance Checklist for Control Structure/Flow Restri,ctar (Structure that controls rate at which water exits facility)

Frequency Drainage ../ Systems Feature

M Structure

A

A

A . _ - .

M

M.S I �!�:nout

A

M,S

A

M.S

M.S I ��rllOW

Problem

TJilsh & debris

StnJct\JraJ damage

Damaged or missing

Obstructions

Obstructions

Conditions To Check For

between debris buildup and bottom of is less than 1-112 feel

Structures are not securely attached to manlle,le wall and outlet pipe structure should support at lea51 1,Ooo pounds of up or down pressure.

StruClUten � I��b�. upright position (allow up to

10% from .

Connections to outlet pipe are not watertight and show signs of rust

Arly holes-other than designed holes-ln the

Cleanout gate is not watertight or is missing.

Gate cannot be moved up and down by one maintenance person.

Chain leading to gate is missing or damaged.

Gate is rusted over 50% of its surface area.

Any truh, �e;��,sediment, or vegetation

I "" I Any trash or debris blocking (or h:�:, the

i the overflow

. .

Conditions That Should Exist

I All trash and debris removed.

securely attached to ¥.-aU and' outlet pipe.

Structure in correct position.

Connections to outlet pipe are repaired or

" 'd wo ... .. I

Structure has no holes other holes.

Gate is watertight and works as

Ga�e�. and down easily ,od

. ' Chain is in place and wom a.'

I

�� �.�::��," "pl."" to

Plale is free of at! obstnJctions and wor1<s as

Pipe Is free of all obstnJctions and wor1<s as deSigned. ,

If you are unsure whether a problem eXists, please contact a ProfeSSional Engineer, Comments:

Key: A=Annual (March or April preferred) M=Monthly (See schedule) S=After major storms (use 1-inch in 24 hours as a guideline)

J - 20

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Page 32: APPENDIX A PROBLEM AREAS DESCRIPTION I l L · out area could possibly be used for environmental mitigation. ... drainage system to the pothole area ... A -Problem Areas Description

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ATTACHMENT "A" (CONTINUED)

Maintenance Checklist for Catch Basins and Inlets

Frequency Drainage ./ Problem Conditions To Check. For System Feature

M,S General Trash, debris, and Trash or debris in front afUle catch basin sediment in Of on opening Is blocking capacity by more basin than 10%

M Sediment or debris (in the basin) that exceeds 113 the depth from the bottom of basin to invert of the lOwest pipe into or out of the basin.

M,S Trash or debris in any Inlet or pipe blocking more than 1/3 of its height

M Structural Comer ot'frame extends more than 314 damage to frame inch past QJrb face into the street (If and/or top slab apprable).

M Top slab has holes larger than 2 square inches or cracks wider than 1/4 inch (Intent is to make sure all material is running into the basin).

M Frame not sitting flush on top slab, Le., separation of more than 314 ioch of the frilme from the top slab.

A Cracks in basin Cracks wider than 112 inch and longer wallslbottom than 3 feet, any evidence of soil particles

entering catch basin through cracks, Of maintenance person judges that structUn! is unsound.

A Cracks wider than 1/2 inch and longer than 1 foot at the joint of any inlet/outlet pipe or any evidence of soil piirticles entering cateh basin through cracks.

A $ettlernent/ Basin has settled more than 1 inch or misalignment has rotated more than 2 inches out of

alignmenl

M.S Fire hazard or Presence of chemicals such as natural other pollution gas, oil, and gasoline. Obnoxious color,

odor, or sludge notei::l. -M,S Outlet pipe is Vegetation or roots growing in inletfoutlet

clogged with pipe joints that is more than six inches vegetation taD and less than six inches apart.

, Conditions That Should Exist

No trash or debris located immediately In front of catch basin opening. Grate is kept clean and allows water to enter.

No sediment OJ debris in the catch basin. CatCh basin is dug out and clean.

Inlet and outlet pipes free of trash or debris.

Frame is even with QJrb.

Top slab is m of holes and cracks.

Frame is sitting flush on top slab.

Basin replaced or repaired to design standartis. Contact a professional engineer for evaluation.

No cracks more than 114 inch wide at the joInt of inlet/outlet pipe. Contact a professional engineer for evaluation.

Basin replaced or repaired 10 design standarUs. Contact a professional engineer for evaluation.

- -

No color, odor, or sludge. Basin is dug out and clean.

No vegetation or root growth present

If you are unsure whether a problem exists, please contact a Professional Engineer.

Comments:

]Sfi: A=Annual (March or April preferred) M=Monthly (see schedule) S=After major storms (use 1 -inch in 24 hours as a guideline)

J - 21

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I ATTACHMENT "A" (CONTINUED)

Maintenance Checklist for Ponds r

Frequency Drainage v" System Feature

M,S General

M,S

M

"M;SY

M

M

M

A

M Side slopes of pond

M �torage area

A Pond dikes

Problem

Trash & debris buildup in pond.

Trash rack plugged or missing

Poisonous vegetation

Fire hazard or pollution

Vegetation not growing or is overgrown

Rodent holes

I", .. ",

Tree growth . .. . , •..

Erosion on belTT\S or at

Conditions to Check For Conditions That Should Exist . . r

Dumping of yard wastes such as grass Remove trash and debris and dispose as r dippings and branches into basin. prescribed by the County. Unsightly aCC1Jmulation of nondegradable materials such as glass,

Replace s�en. Remove trash and debris�' plastic, metal, foam, and coated paper.

Bar screen over outlet more than 25% covered by debris or missing. and dispose as prescribed by the County.

l' Any poisonous vegetation which may Remove poisonous vegetation. Do not constitute a hazard to the public. spray chemicals on vegetation without Examples of poisonous vegetation obtaining guidance from the Cooperative r include: tansy ragwort, poison oak. Extension Service and approval from the stinging nettles, devilsclub. County.

Presence of chemicals such as natulal Find sources of pollution and<ertminate gas, on, and gasoline, obnoxious color, them. Water is free from noticeable color, • odor, or sludge noted. odor. or contamination.

For glassy ponds, ·glass cover is sparse For glassy ponds, selectively thatch, and weedy or is overgrown. For· aerate, and reseed ponds. Grass cutting • weiland ponds, plants are sparse or unnecessary unless dictated by aesthetics. invasive species are present. For wetland ponds, hand-plant nursery-

grown weUand plants in bare areas. Contact the Cooperative Extension SeNice for direction on invasive species such as • pu!ple loosestrife and reed canary gras.'" . Pond bottoms should have uniform deLI coverage of desired plant species.

Any evidence of rodent holes if facility is Rodents destroyed and dam or berm acting as a dam or berm, or any repaired. Contact the Tacoma-Pierce evidence of water piping through dam or County Health Department for guidance. berm via rodent holes.

lNhen insects such as wasps and Insects destroyed or removed from site. hornets interfere with maintenance Contact Cooperative Extension SeNice for 1 activities, or when mosquitoes become guidance. a nuisance.

Tree growth does not aUow Trees do not hinder maintenance maintenance access or interferes with activities. Selectively cultivate trees such maintenance activity (e.g., slope as alders for firewood. mowing, silt removal, or equipment movements). If trees are not interfering with access, leave trees alone.

Check around inlets and outlets for Find causes of erosion and eliminate signs of erosion. Check belTT\S for signs them. Then slopes should be stabilized b

entrance or exit of sltding or settling. Action is needed USing appropriate erosion control where eroded damage over 2 inches deep and wheRi there is potential for continued erosion.

Sediment build· Accumulated sediment that exceeds up in pond 10% of the designed pond depth.

Buried or partially buried outlet stl'\Jcture probably indicates significant sediment deposits.

Settlements Any part of dike which has settled 4 inches lower than the design elevation.

J - 22

measure(s); e.g., rock reinforcement, planting of grass, compaction. I Sediment cleaned out to designed pond I 1 shape and depth; pond reseeded if necessary to control erosion.

Dike should be built back to the desigll elevation.

� \ 1 I , r :

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I ' I r ' . "

r r : r r ! r n r r , r , r l r rl r l n r r

Frequency Drainage ./ p",- Conditions to Check For Conditions That Should Exist System Feature

A Emergency Rock missing Only one layer of rock exists above Replace rocks to design standards. overftowl native soU in area 5 square feet or 5pB�y larger. or any exposure of native soil.

One rune Emergency OVerflow Side of pond has no area with large Contact the County for guidance. over1\owl missing rocks to handle emergency overflows. spillway

If you are unsure whether a problem exists, please contact a Professional Engineer.

Comments:

�: A=Annual (March or April preferred) M=Monthly (see schedule) S::After major storms (use 1-inch in 24 hours as a guideline)

J - 23

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ATTACHMENT "A" (CONTINUED)

Maintenance Checklist for Infiltration Systems

Problem Frequency Drainage ./ Conditions to Cheek For Conditions That Should Exist . .

System Feature

M,S General Trash & debris buildup in pond See Maintenance See Maintenance Checklist for Ponds. Checklist for Ponds .

M ." Poisonous vegetation See Maintenance See Maintenance Checklist for Ponds. Checklist for Ponds.

M,S Fire hazard or pollution See Maintenance See Maintenance Cheddist for Ponds. Checklist for Ponds,

M Vegetation not growing or is See Maintenance See Maintenance Checklist for Ponds. overgrown Checklist for Ponds.

M Rodent holes See Maintenance See Maintenance Checklist for Ponds. . Checklist for Ponds .

M lose<Z See Maintenance See Maintenance Cheddist for Ponds. Checklist for Ponds. _._ w

. A Storage area Sediment buildup in system A soil texture test Indicates Sediment is removed andlor facility is

facility is not working at its deaned so that infiltnltion system worb designed capabilities or according to design. A sediment was incorrectly designed. trapping area is instaHed to reduce

sediment transport into infiltration area.

A Storage area drains slowly (more A soil texture test Indicates Additional volume IS added through than 48 hours) or overflows facility is not wonting at its excavation to provide needed storage.

deSigned capabilities or So� is aerated and rototiJIed to improve was incorrectly designed. drainage. Contact the County for

information on its requirements regarding excavation.

,

M Sediment trapping area Any sediment and debris Clean out sump to design depth. filling area to 10% of depth from sump bottom to bottom of outlet pipe or obstructing flow into the connector pipe.

One TIme Sediment trapping area not Stormwater enters Add a trapping area by constructing a present Infiltration area directly sump for settling of solids. Segregate

without treatment settling area from rest of facility. . . . Contact the County for guidance .

M Rock filters Sediment and debris By visual inspection little or Replace gravel in ruck filter. no water flows thruugh filter during heavy rain storms.

If you are unsure whether a problem exists, please contact a Professional Engineer.

Comments:

Key: A;Annual (March or April preferred) M;Monthly (see schedule) S=After major storms (use 1-inch in 24 hours as a guideline)

J - 24

r r r r r r ,

r , ,

!

r r ,

.. ..

r

r1 ,

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� � :�

�1 �, �! , r, �,

r

r

A IT ACHMENT "A" (CONTINUED)

Maintenance Checklist for Energy Dissipators

Frequency Drainage ./ Problem Conditions to Check. For Conditions That Should Exist System Feature

A Rock pad Missing or moved Only one layer of rod!: exists above native Replace rodts to design standard. rnck soil in area 5 square feet or larger, or any

exposure of native soil

A Rock·filled Missing or moved Trench is not full of rock. Add large rock (+ or - 30 lb. each) trench for ,cd< so that rock Is visible above edge discharge from of trench. PO"'

M Dispersion Pipe plugged with Accumulated sediment that exceeds 200.4 01 Pipe cleanedlflushed. trench sediment the design depth.

M Perforations OVer 112 of perforations in pipe are plugged Clean or replace perforated pipe. plugged with debris and sediment

M,S Not discharging Visual evidence of water discharging at Trench must be redesigned or water property concentrated points along trend! (notmal rebuilt to standard. Elevation of lip

condition is a ·sheet flow" of water along of trench should be the same (flat) trench). Intent is to prevent erosion at aU points. damage.

M,S Water flows out Maintenance person observes water FaaTrty must be rebuilt or top of "distributor"' flowing out during any strom less than the redesigned to standards. Pipe is catcn basin design storm or It is causing or appears probably plugged or damaged and

likely to cause damage. needs replacement.

M,S Receiving area Water in receiving area Is causing Of has StabiflZe slope with grass or other over-saturil\ed potential of causing landslide. vegetation, or rock if condition is

severe. Contad a professional engineer for evaluation.

If you are unsure whether a problem exists, please contact a Professional Engineer.

Comments:

A;Annual (March or April preferred) M;Monthly (see schedule) S=After major

· storms (use 1-inch in 24 hours as a guideline)

J - 25

,

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ATTACHMENT "A" (CONTINUED)

Maintenance Checklist for FencingfShrubbery Screen/Other Landscaping

Frequency Drainage ./ Problem Conditions to Chedt For Conditions That Should System ex;,t Feature

M General Missing or Any defed in the fence or screen that permits Fence is mended or broken easy entry to a faCIlity. shrubs replaced to form a parts/dead solid barrier to entry. shrubbery

M,S Erosion Erosion has resulted in an opening under a Replace soU under fence fence that allaNS entry by people or pets. so that no opening

exceeds 4 inches in height

M Unruly Shrubbery is growing out of control or is Infested Shrubbery is trimmed vegetation with weeds, and weeded to provide

appealing aesthetics. Do not use chemicals to control weeds.

A Wire Fences Oamaged parts Posts out of plumb riiOj-e-�'.!§.inches. Posts plumb to within 1· 112 inches Ofp!urnti.

A Top raRs bent more than 6 inches. Top ran free of bends greater than 1 inch,

A Any part of fence (induding posts, top rails, 'and Fence is aligned and fabric) more than 1 foot out of design alignment meets design standards.

\ A Missing or loose tension wire. Tension wire in place and holding fabric.

A Missing or loose barbed wire that is sagging Barbed wire in place with ' more than 2-112 Inches between posts. less than 314-lnch sag

between posts.

A Extension arm missing, broken, or bent out of Ex1ension arm in place shape more than 1-1/2 inches. with no bends larger than

314 inch.

A Deteriorated Part or parts that have a rusting or scaling Structurally adequate paint or condition that has affected structural adequacy. posts or parts with a protective uniform protective coating coating.

M Openings in Openings in fabric are such that an 8-inch No openings in fabric. fabric diameter ball could fit through.

If you are unsure whether a problem exists, please contact a Professional Engineer.

Comments:

A=Annual (March or April preferred) M=Monthly (see schedule) S::;After major storms (use 1-inch in 24 hours as a guideline)

J - 26

I �I I �

.. I�, '.�',- .

I .

I� I� II I � II 1:-'1 I� 1 1 1 -, I i 1-, rl Ii rl t

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I ATIACHMENT "A" (CONTINUED) 11lance Checklist for Gates

!Quency Orainage ./ Problem Conditions to Check For Conditions That Should Exist

I System Feature

,., General Damaged or missing Gate is broken, jammed, or Pond has a functioning gate to

I components missing. allow entry of people and

I maintenance equipment such 1$ mowers and backhoe. If a lock is used, make sure the County field staff have a key.

r I Broken or missing hinges such Hinges intact and tUbed. Gate Is that gate cannot be easily working freely. opened and closed by a maintenance person.

I ' Gate is out of plumb more than S Gate is aligned and verticaL Inches and more than 1 foot out 0"' design alignment.

r \ Missing stretcher bandS, and Stretcher bar, bands, and ties in ties, place.

r' ,are unsure whether a problem exists, please contact a Professional Engineer.

mments:

r I

r r r 1 r

r ,

r

A;Annual (March or April preferred) M;Monthly (see schedule) S=After major storms (use 1-inch in 24 hours as a guideline)

J - 27

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ATIACHMENT "A" (CONTINUED)

aintenance Checklist for Grounds (Landscaping)

� Frequency Drainage ./ Problem Conditions to Check For Conditions That Should Exist ."

System Feature

M General Weeds (nonpoisonous) Weeds growing in more than 20% of the Weeds present in less than 5% of Landscaped area (trees and shrubs only). the landscaped area.

M Insect hazard Any presence of poison ivy or other No poisonous vegetation or Insect poisonous vegetation or Insect nests. nests present in lanscaped area.

M,S Trash or litter See Ponds Cheddlsl See Ponds Check.list.

M,S Erosion of Ground Noticeable rills are seen in landscaped Causes of erosion are identified Suriace areas. and steps taken to slow

down/spread out the water. Eroded areas are filled, contoured, and seeded.

A Trees and Damage Umbs or parts of trees or shrubs that are Trim trees/shrubs to restore shrubs split or broken which affect more than shape. Replace treesfshrubs with

- 25% of the total foliage of the � or severe damage. shrub. --

M Trees or shrubs that have been blown Rep!ant tree, inspecting for injury down or knocked over. to stem or roots. Replace if

severely damaged.

A Trees or shrubs which are not Place stakes and rubber.(;Oated adequately supported or are leaning ties around young trees/shrubs for over, causing exposure of the roots. support.

you are unsure whether a problem exists, please contact a Professional Engineer.

omments:

!l)(: A�Annual (March or April preferred) M�Monthly (see schedule) S=After major storms (use 1-inch in 24 hours as a guideline)

J - 30

. inst. =

r I

=. lid Exist

nent and , , so water • ".

�,

• ><I.

><I, f-lis and � 7'J the .

C

liment and � design. "g' ation sh.

In standard.

!Ckiist , I

lobe .' 1

.. ",

d

:'1 lintain gras 116 inches \ �atment . ! h, recontour, "'Y,

----" . , ' homeowne

� ,e area be I County to 'edified .

Ided to che :Ito be in 1-

�I�;�:"·rl

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I I I I .

I I I I I I I I I I I r r r : r

ATTACHMENT "A" (CONTINUED)

Maintenance Checklist for Access Roads/Easements

Frequency Drainage ./ Problem Conditions to Check For Conditions That Should Exist S)"tem Feature

One TII'TIe General No access road If ponds or other drainage system Detennine whether an easement ex"" features needing maintenance by to drainage feature exists. If yes.

motorized equipment are present, either obtain the County permits and an access road or access frtIm public: construct gravel (or equal) access streets is requm. road. If not, report lack of

easement to the Municipaolity.

M Blocked Roadway Debris which could damage vehicle tires Roadway free of debris which (glass or metal). could damage tires.

A Any obstructions which reduce clearance Roadway overheaa dearto 14 above road surface to less than 14 feet. fHI: high.

A Arty obstructions restricting the access to Obstruction removed to allow at less than 15 feet width.. . least a 1 5-ftx?t-wide access.

A.S Road Surface Set1lement, When any surface irregularity exceeds 6 Road surface uniformly smooth potholes, mush inches in depth and 6 SQuare feet in area. with no evidence of settlement, spots. ruts In general, any surface defect which potholes. mush spots, or ruts.

hinders or prevents maintenance access. Occasionally application of . additional gravel or pitru n rock will be needed.

M Vegetation in road Woody growth that could block vehicular Remove woody growth at early Stlrface access. Excessive weed cover. stage to prevent vehiclJlar

blockage. Cut back weeds if they begin to encroach on road surface.

M.S Shoulde� Erosion damage Erosion within t foot of the roadway more Shoulder free of erosion and and ditches than 8 inches wide and 6 inches deep. matching the surrounding road.

If you are unsure whether a problem exists, please contact a Professional Engineer.

Comments:

�: A=Annual (March or April preferred) M=Monthly (see schedule) S=After major storms (use 1-inch in 24 hours as a guideline)

J - 31

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I I I I I . I I I L L L L L L L L

APPENDIX F

HYDROLOGIC MODELING

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I I I I

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Page 45: APPENDIX A PROBLEM AREAS DESCRIPTION I l L · out area could possibly be used for environmental mitigation. ... drainage system to the pothole area ... A -Problem Areas Description

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Page 49: APPENDIX A PROBLEM AREAS DESCRIPTION I l L · out area could possibly be used for environmental mitigation. ... drainage system to the pothole area ... A -Problem Areas Description

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Page 59: APPENDIX A PROBLEM AREAS DESCRIPTION I l L · out area could possibly be used for environmental mitigation. ... drainage system to the pothole area ... A -Problem Areas Description

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Page 96: APPENDIX A PROBLEM AREAS DESCRIPTION I l L · out area could possibly be used for environmental mitigation. ... drainage system to the pothole area ... A -Problem Areas Description

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Page 99: APPENDIX A PROBLEM AREAS DESCRIPTION I l L · out area could possibly be used for environmental mitigation. ... drainage system to the pothole area ... A -Problem Areas Description

ORDINANCE NO. 906

AN ORDINANCE OF THE CITY COUNCIL OF THE CITY OF

BONNEY LAKE, PIERCE COUNTY, WASHINGTON, ADOPTING

THE CITY OF BONNEY LAKE COMPREHENSIVE

STORM WATER PLAN DATED SEPTEMBER 2000.

WHEREAS, the City of Bonney Lake initiated a water quality program to meet the National Pollutant Discharge Elimination System (NPDES) Phase II Storm water regulations for Tier n communities; and

WHEREAS, The City of Bonney Lake has hired Montgomery Water Group who have now completed the Comprehensive Plan and all revisions; and

WHEREAS, A public Hearing was held on November 13, 2001; and

WHEREAS, The Bonney Lake City Council deliberated on and approved the comprehensive Plan.

NOW THEREFORE, THE CITY COUNCIL OF THE CITY OF BONNEY LAKE,

WASHINGTON, DO ORDAIN AS FOLLOWS:

Section 1 . The City of Bonney Lake Council does hereby fonnally adopt the 2000 City of Bonney Lake Comprehensive Stonnwater Plan, Exhibit "A" attached and incorporated herein by reference and does intend to implement the policies and directives of the plan.

Section 2. Effective Date of Ordinance. This Ordinance shall take effect and be in force five (5) days from and after its passage. approval and publication, as required by law.

PASSED by the City Council and approved by the Mayor this I llh day of December . 200 I .

Page 1

Page 100: APPENDIX A PROBLEM AREAS DESCRIPTION I l L · out area could possibly be used for environmental mitigation. ... drainage system to the pothole area ... A -Problem Areas Description

ATTEST:

Gayle But9 er City Clerk, CMC

APPROVED AS T FORM:

Passed: /. 1.,/ /f I Lei Valid:

Published: P-/17/c1 Effective Date: I 1.>- .), 'leI

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