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HomeMy WebLinkAbout2003 - Storm Drainage Maintenance Plan - GMRI Inc - 20030313001997Document Title(s) (or transactions contained therein): (all areas applicable to your document must be filled in) 20030313001997 Reference Number(s) of Documents assigned or released: Additional reference #'s on page of document Grantor(s) (Last name, first name, initials) . STORM DRAINAGE MAINTENANCE PLAN GMRI INC 2623049023 Additional names on page of document. • Grantee(s) (Last name first, then first name and initials) 1. C�1 tit RI. i .tt 4 (:A tt a 1A (_ 2. • , Additional names on page of document. Legal description (abbreviated: i.e. lot, block, plat or section, township, range) • Additional legal is on page of document. Assessor's Property Tax Parcel/Account Number • ❑ Assessor Tax # not yet assigned 2L '?3c f -- ei . The Auditor/Recorder will rely on the information provided on the form. The staff will not read the document to verify the accuracy or completeness of the indexing information provided herein. Return Address: I-ete. a.2t.. /O P,e }x ir-t-rez Pp-. itf gel ei CA 41- ll N HO i H NI lID 20030313001997 MURPHY MISC 32.00 PAGE 001 OF 014 03/13/2003 12:31 KING COUNTY, WA Please print or type information WASHINGTON STATE RECORDER'S Cover Sheet i OF MgR 7 pF /T eo 0 3 . CF RCW 65.04 I am requesting an emergency nonstandard recording for an additional fee as provided in RCW 36.18.010. I understand that the recording processing requirements may cover up or otherwise obscure some part of the text of the original document. Signature of Requesting Party 102..- 317 k Z d • w Q dd : 2 W O 0 to W= LL W O < I z � !— O Z 1— W • j U � O N 0 W W � U O W z U= O Z Ecr3 MATERIALS Stoamceptor` Peter W. Van Tilburg Area Manager Hydro Conduit Division Rinker Materials 800 N.E. Tenney Rd., Suite 413 Vancouver, WA 98685 Cell 503.572.9894 Fax 503.296.2023 pvantilburg@rinker.com www.rinkerstormceptor.com www.hydroconduit.com TIC STORMCEPTOR® SYSTEM � Owner's Manual n Oti Owner's Manual 1. Stormceptor Overview 2 Stormceptor System Operation 3. Identification of Stormceptor 4. Stormceptor Maintenance Guidelines 4.1 Recommended Maintenance Procedure 4.2 Disposal of Trapped Material from Stormceptor Recommended Safety Procedures Stormceptor Monitoring Protocol 6.1 Pollutants to be Monitored 6.2 Monitoring Methodology Rev. 10/2000 •••-., List of Tables Table 1. Stormceptor Dimensions 4 Table 2. Stormceptor Capacities 5 Table 3. Sediment Depths Indicating Required Maintenance 5 Table 4. Monitoring Pollutants 9 List of Figures Figure 1. Single Inlet/Outlet "Disc" Insert In -Line Stormceptor Figure 2. STC 450i Inlet Stormceptor Page 6 6 If this manual is more than one year old, please contact CSR for an updated version by calling (800) 909 -7763 or by visiting our website at www.csrstormceptor:com Stormceptor® Owners Manual Contents Stormceptor® Page 1 z • W • : . 2 U ; O 0 N 0 w = J • LL w 0 u . w 0 = d . _ Z '. I- 0 Z 2 uj U O co O F— w w z I- F r � O 0 = z Owner's Manual Page 2 Thank You! We want to thank you for selecting the Stormceptor System to use in your efforts in protecting the environment. Stormceptor is one of the most effective and maintenance friendly storm water quality treatment devices available. if you have any questions regarding the operation and maintenance of the Stormceptor System, please call your local CSR representative, or the Stormceptor Information Line at (800) 909 -7763. 1. Stormceptor Overview The Stormceptor System is a water quality device used to remove total suspended solids (TSS) and free oil (TPH) from storm water run -off. Stormceptor takes the place of a conventional manhole or inlet structure within a storm drain system. CSR manufactures the Stormceptor System with precast concrete components and a fiberglass disc insert. A fiberglass Stormceptor can also be provided for special applications. The Stormceptor System product line consists of four patented designs: • The In -Line (Conventional) Stormceptor, available in eight model sizes ranging from 900 to 7200 gallon storage capacity. • An In -Line (Series) Stormceptor is available in three model sizes ranging from 1 I,000 to 16,000 gallon storage capacity. • The Submerged Stormceptor, an in -line system designed for oil and sediment removal in partially submerged pipes, available in eight models sizes ranging from 900 to 7200 gallon storage capacity. • The Inlet Stormceptor is a 450 gallon unit designed for small drainage areas. Stormceptor removes free oil and suspended solids from storm water preventing hazardous spills and non -point source pollution from entering downstream lakes and rivers. CSR and its affiliates market and manufacture the Stormceptor System in the United States and Australia. Several thousand Stormceptor Systems have been installed in various locations throughout North America, Australia and the Caribbean since 1990. In the Stormceptor, a fiberglass insert separates the treatment chamber from the by -pass chamber. The different insert designs are illustrated in Figures 1 and 2. These designs are easily distinguishable from the surface once the cover has been removed. There are four versions of the in -line disc insert: single inlet /outlet, multiple inlet, in -line series insert and submerged designs. In the non - submerged "disc" design you will be able to see the inlet pipe, the drop pipe opening to the lower chamber, the weir, a 6" oil inspection /cleanout pipe, a large 24" riser pipe opening offset on the outlet side of the structure, and the outlet pipe from the unit. The weir will be around the 24" outlet pipe on the multiple inlet disc insert and on large diameter pipe applications. The STCs Stormceptors consist of two chambers comprised of similar fiberglass inserts. These units also contain a 6" oil /inspection cleanout pipe and 24" outlet riser pipes. The submerged disc insert has a higher weir and a second inlet drop pipe. In the inlet design you will be able to see an inlet drop pipe and an outlet riser pipe as well as a central oil inspection /cleanout port. Stormceptor:'' Owner's Manual Page 3 2. Stormceptor System Operation The Stormceptor consists of a lower treatment chamber, which is always full of water, and a by -pass chamber. Storm water flows into the by -pass chamber via the storm sewer pipe or grated inlet (Inlet Stormceptor). Normal flows are diverted by a weir and drop arrangement into a treatment chamber. Water flows up through the submerged outlet pipe based on the head at the inlet weir and is discharged back into the by -pass chamber downstream of the weir. The downstream section of the pipe is connected to the outlet sewer pipe. Oil and other liquids with a specific gravity less than water rise in the treatment chamber and become trapped under the fiberglass weir. Sediment will settle to the bottom of the chamber by gravity. The circular design of the treatment chamber is critical to prevent turbulent eddy currents and to promote settling. During infrequent high flow conditions, storm water will by -pass the weir and be conveyed to the outlet sewer directly. The by -pass is an integral part of the Stormceptor since other oil /grit separators have been noted to scour during high flow conditions (Schueler and Shepp, 1993). The key benefits of Stormceptor include: Capable of removing more than 80% of the total sediment load when properly applied as a source control for small drainage areas Removes free oil from storm water during normal flow conditions Will not scour or resuspend trapped pollutants Ideal spill control device for commercial and industrial developments Vertical orientation facilitates maintenance and inspections 3. Identification of Stormceptor All In -Line (including Submerged) Stormceptors are provided with their own frame and cover. The cover has the name STORMCEPTOR clearly embossed on it to allow easy identification of the unit. The name Stormceptor is not embossed on the inlet models due to the variability of inlet grates used /approved across North America. You will be able to identify the Inlet Stormceptor by looking into the grate since the insert will be visible. Once you have located a unit, there still may be a question as to the size of the unit. Comparing the measured depth from the water level (bottom of insert) to the bottom of the tank with Table I should help determine the size of the unit. Stormcep tor Table 1. Stormceptor Dimensions* Model Pipe Invert to Top of Base Slab 450i 60" 900 55" 1200 71" 1800 105" 2400 94" 3600 134" 4800 128" 6000 150" 7200 134" 11000s 128 "''" 13000s 150 "'';. 16000s 134 ' fi Owner's Manual Page 4 Depths are approximate. ** Depths per structure Starting in 1996, a metal serial number tag has been affixed to the fiberglass insert. If the unit does not have a serial number, or if there is any uncertainty regarding the size of the Stormceptor using depth measurements, please contact the CSR Stormceptor information line at (800) 909 -7763 for assistance. 4. Stormceptor Maintenance Guidelines The performance of all storm water quality measures that rely on sedimentation decreases as they fill with sediment (See Table 2 for Stormceptor capacities). An estimate of performance loss can be made from the relationship between performance and storage volume. CSR recommends maintenance be performed when the sediment volume in the unit reaches 15% of the total storage. This recommenda- tion is based on several factors: • Sediment removal is easier when removed on a regular basis (as sediment builds up it compacts and solidifies making maintenance more difficult). • Development of a routine maintenance interval helps ensure a regular maintenance schedule is followed. Although the frequency of maintenance will depend on site conditions, it is estimated that annual maintenance will be required for most applications; annual maintenance is a routine occurrence which is easy to plan for and remember. • A minimal performance degradation due to sediment build -up can occur. In the event of any hazardous material spill, CSR recommends maintenance be performed immediately. Maintenance should be performed by a licensed liquid waste hauler. You should also notify the appropriate regulatory agencies as required. Stormcepto►'"' Table 3. Sediment Depths Lidicating Required Maintenance Table 2. Stormceptor Capacities Sediment Depth Model Sediment Capacity ft' (L) Oil Capacity US gal (L) 'Total Holding Capacity US gal (L) 450i 45 (1276) 86 (326) 470 (1779) 900 75 (2135) 251 (950) 952 (3604) 1200 113 (3202) 251 (950) 1234 (4671) 1800 193 (5470) 251 (950) 1833 (6939) 2400 155 (4387) 840 (3180) 2462 (9320) 3600 323 (9134) 840 (3180) 3715 (14063) 4800 465 (13158) 909 (3441) 5059 (19150) 6000 609 (17235) 909 (3441) 6136 (23227) 7200 726 (20551) 1059 (4009) 7420 (28088) 11000s 942 (26687) 2797 (10588) 11194 (42374) 13000s 1230 (34841) 2797 (10588) 13348 (50528) 16000s 1470 (41632) 3055 (11564) 15918 (60256) Table 3. Sediment Depths Lidicating Required Maintenance Model Sediment Depth 450i 8" (200 mm) 900 8" (200 mm) 1200 10" (250 mm) 1800 15" (375 mm) 2400 12" (300 mm) 3600 17" (425 mm) 4800 15" (375 mm) 6000 18" (450 mm) 7200 15" (375 mm) 11000s 15" (375 min) ** 13000s 18" (375 mm)'':: 16000s 15" (375 rum)" �` Owner's Manual 4.1 Recommended Maintenance Procedure * Depths are approximate. :k:.k In each structure. Stormceptor' Page 5 For the "disc" design, oil is removed through the 6" inspection /cleanout pipe and sediment is removed through the 24" diameter outlet riser pipe. Alternatively, oil could be removed from the 24" opening if water is removed from the treatment chamber, lowering the oil level below the drop pipes. The depth of sediment can be measured from the surface of the Stormceptor with a dipstick tube equipped with a ball valve (Sludge Judge'). It is recommended that maintenance be performed once the sediment depth exceeds the guideline values provided in Table 3 for the reasons noted in Section 4 Stormceptor Maintenance Guidelines. Owner's Manual Page 6 No entry into the unit is required for routine maintenance of the Inlet Stormceptor or the smaller disc insert models of the In -Line Stormceptor. Entry to the level of the disc insert may be required for servicing the larger disc insert models. Any potential obstructions at the inlet can be observed from the surface. The fiberglass insert has been designed as a platform for authorized maintenance personnel, in the event that an obstruction needs to be removed, sewer flushing needs to be performed, or camera surveys are required. Typically, maintenance is performed by the Vacuum Service Industry, a well established sector of the service industry that cleans underground tanks, sewers, and catch- basins. Costs to clean a Stormceptor will vary based on the size of the unit and transportation distances. If you need assistance for cleaning a Stormceptor unit, contact your local CSR representative, or the Stormceptor Information Line at (800) 909 -7763. Figures 1 and 2 will help illustrate the access point for routine maintenance of Stormceptor. Sediment & oil removal can be performed by vacuums Concrete Stormceptor .I: Figure 2 STC 4501 Inlet Stormceptor Figure 1 Single Inlet/Outlet "Disc" Insert In -Line Stormceptor Stormceptor" Oil removal can be / performed by vacuum track through the oil /inspection port Disc Insert .I' •• • {', MM tinteni Inlet Grate M• Removable : r{ Tee : s, Inlet Insert nrK m.m� <roMxbf•.•,s:u.:. »aNruvrnMwraw�x}S+v,rPnn:44.� r0,14400,4 {. Owner's Manual Page 7 4.2 Disposal of Trapped Material from Stormceptor The requirements for the disposal of material from Stormceptor are similar to that of any other Best Management Practices (BMP). Local guidelines should be consulted prior to disposal of the separator contents. In most areas the sediment, once dewatered, can be disposed of in a sanitary landfill. It is not anticipated that the sediment would be classified as hazardous waste. In some areas, mixing the water with the sediment will create a slurry that can be discharged into a trunk sanitary sewer. In all disposal options, approval from the disposal facility operator /agency is required. Petroleum waste products collected in Stormceptor (oil /chemical /fuel spills) should be removed by a licensed waste management company. What if I see an oil rainbow or sheen at the Stormceptor outlet? With a steady influx of water with high concentrations of oil, a sheen may be noticeable at the Stormceptor outlet. This may occur because a rainbow or sheen can be seen at very small oil concen- trations (< 10 ppm). Stormceptor will remove over 95% of all free oil and the appearance of a sheen at the outlet with high influent oil concentrations does not mean that the unit is not working to this level of removal. In addition, if the influent oil is emulsified, the Stormceptor will not be able to remove it. The Stormceptor is designed for free oil removal and not emulsified or dissolved oil conditions. 5.0 Recommended Safety Procedures CSR strongly recommends that any person who enter a Stormceptor System follow all applicable OSHA regulations for entry and work in permit required confined spaces, as outlined in 29 CFR 1910.146. A permit required confined space consists of a space that: • Is large enough and so configured that an employee can bodily enter and perform assigned work. • Has limited or restricted means for entry and exit. • Is not designed' for continuous employee occupancy. • Contains or has one of the following: - a potential to contain a hazardous atmosphere. - a material that has the potential for engulfing an entrant. - any other recognized serious safety hazard. Storm water and wastewater systems fall under the OSHA guidelines for a permit required confined space. Failure to follow OSHA guidelines for entry and work in a permit required confined space can result in serious injury or death. Please exercise extreme caution and follow appropriate safety procedures when entering any confined space. Two square pick holes in the cover vent the Stormceptor, allow for removal of the cover, and provide sampling ports for air quality monitoring before the cover is removed. If you must enter the Stormceptor, please note that if the disc insert inside is wet, it can be slippery. Stormceptor Owner's Manual Page 8 Recognizing that every work site is different, the responsibility for safety falls on the contractor. The contractor must ensure that all employees and subcontractors follow established safety procedures and OSHA regulations for working in and around permit required confined spaces as well as for any other safety hazard that may be present on that particular site. z W. 6.0 Stormceptor Monitoring Protocol w J U 00 U J i- If monitoring of your Stormceptor System is required, we recommend you follow the procedures outlined below by the CSR Stormceptor office. If you have any questions regarding monitoring please contact the CSR Stormceptor Technical Director at (800) 909 -7763. w O' 6.1 Pollutants to be Monitored I a Table 4 indicates the pollutants to be monitored during the storm events and the minimum acceptable N a detection limit for each pollutant to be analyzed. Approved federal or state laboratory analysis methodologies are to be used for the analysis. .— O z t- The optional metals indicated in Table 4 refer to the Resource Conservation Recovery Act and may be g �: covered by a generic metals scan. Bacteria monitoring will not be required unless explicitly requested v N O elsewhere. o F- w w. Two sediment samples are to be extracted from the monitored Stormceptor at the end of the study and H a . analyzed for the particle size distribution and water content. A minimum of 8 U.S. Sieve sizes is to be • z; co used to determine the particle size distribution. Sieves that are used must include, but are not limited v to 35, 60, 100, 140, 200, 270, and 400. Three clay particle sizes must be analyzed to denote particle P sizes between 5 and 25 µm. The particle size distributions should be plotted on a standard grain size •z distribution graph. Stormceptoe 0 At". st• unsvNeri Table 4. Monitoring Pollutants Pollutant Minimum Detection Limit (MDL) Total Suspended Solids (TSS) 5 mg /1 Total Phosphorus (P) 0.02 mg /1 Total Kjeldahl Nitrogen (TKN) 0.1 mg /I Copper (Cu) 0.001 mg /1 Cadmium (Cd) 0.005 mg /1 Lead (Pb) 0.05 mg /1 Zinc (Zn) 0.01 mg /1 Chromium (Cr) 0.01 mg /1 Total Petroleum Hydrocarbons (TPH) 1 mg /I Conductivity 0.1 µmho /cm Fecal Coliform* 1/100 ml Additional Metals (optional) Arsenic (As) 0.005 mg /1 Barium (Ba) 0.01 mg /1 Mercury (Hg) 0.0005 mg /1 Selenium (Se) 0.005 mg /1 Silver (Ag) 0.01 mg /1 Owner's Manual * only if explicitly requested in Terms of Reference 6.2 Monitoring Methodology The following monitoring protocol should be followed to ensure reasonable monitoring results and interpretation: • Monitoring protocols should conform to EPA 40 CFR Part 136. • The EPA guideline of 72 hours dry period prior to a monitoring event should be used. This will ensure that there is sufficient pollutant build -up available for wash -off during the monitored event. • Flow proportional monitoring must be conducted for the parameters indicated in Table 1. Samples should be analyzed separately for the first flush versus the remainder of the storm event. Monitoring need not extend longer than an 8 -hour period after the start of the storm event (composite). • Sediment sampling (measuring the sediment depth in the unit at the beginning and end of the monitoring period) must be conducted. The water content of the sediment layer must be analyzed to determine the dry volume of suspended solids. Sediment depth sampling will indicate the rate of pollution accumulation in the unit, provide confirmation that the unit is not scouring and confirm the flow proportional monitoring results. A mass balance using the sediment sampling should be calculated to validate the flow proportional sampling. Stormceptoi Page 9 Owner's Manual Page 10 • Grab sampling (just taking samples at the inlet and outlet) is an unacceptable methodology for testing the performance of the Stormceptor during wet weather conditions unless it is flow weighted (flow weighted composite sample from numerous grab samples) over the entire storm. • The oil containment area underneath the insert should be inspected via the vent pipe for dry weather spills capture once a month during the monitoring period since the flow rate of a dry weather spill may not trigger the automated samplers. • A tipping bucket rain gauge should be installed on -site to record the distribution of storm intensities and rainfall volume during the monitored events. • Results that are within the laboratory error (both inlet and outlet) or are representative of relatively clean water should be discarded. Typical concentrations of pollutants in storm water are: TSS 100 mg /L Total P 0.33 mg /L TKN 1.50 mg /L Total Cu 34 pg /L Total Pb 144 pg /L Total Zn 160 pg /L A thresholdfirst flush /composite TSS value of 50 mg /L at the inlet to the Stormceptor should be used as the lower limit of an acceptable storm for reporting event efficiency. Monitoring results where the influent TSS concentration is less than 50 mg /L should only be used in mass load removal calculations over the entire monitoring period with other storms where the influent concentration is greater than 50 mg /L. The results should not be analyzed if the influent TSS concentrations during all monitored storms are less than 50 mg /L. Storms where the influent TSS concentration is less than 10 mg /L should be discarded from all analyses. • A threshold storm event volume equal to 1.5 times the storage volume of the Stormceptor being monitored should be used as the lower limit of an acceptable storm for monitoring. • Sampling at the outlet of the Stormceptor should be conducted within the 24" outlet riser pipe to accurately define event performance. • The personnel monitoring the Stormceptor should record incidental information in a log file. Information such as weather, site conditions, inspection and maintenance information, monitoring equipment failure, etc. provide valuable information that can explain anomalous results. • Laboratory results of monitored samples should be analyzed within 10 days of being submitted to the lab. • Weekly inspections of the sampling tubes, flow meter, rain gauge, and quality samplers should be conducted to ensure proper operation of the monitoring equipment. Debris and sediment that collects around the sampling intakes should be cleaned after each event. • During the installation of automated quality samplers, care should be exercised to ensure that representative samples will be extracted (placement of intakes, ensuring that tubing is not constricted or crimped). • Sampling should be conducted for a minimum of 6 storms. Ideally 15 storms should be sampled if the budget allows. Stormceptor° Call the Stormceptor Information Line (800 - 909 -7763) for more detailed informa- tion and test results. TECHNICAL INFORMATION: • Stormceptor CD ROM • Stormceptor Technical Manual • Stormceptor Installation Guide • Stormceptor Brochure TEST RESULTS: • STEP Report (Independent Verification) • University of Coventry Study • ETV Canada (Federal Verification) • National Water Research Institute Test • Westwood, MA Field Monitoring Study • Edmonton, Canada Field Monitoring Study • Seattle Field Monitoring • Como Park, MN Field Monitoring Study • Florida Atlantic University Submerged Stormceptor Testing • Oil Removal Field Validation • Sludge Analyses and Particle Size Analysis 712 Broadway, Suite 600 Kansas City, MO 64105 Phone: (816) 802 -3870 Fax: (816) 802 -3871 Toll Free: (800) 909 -7763 www.csrstorntceptor.cont Rev. 10/2000 NEW PARCEL B: THAT PORTION OF THE NORTHWEST QUARTER OF THE NORTHEAST QUARTER OF SECTION 26, TOWNSHIP 23 NORTH, RANGE 4 EAST, W.M., IN KING COUNTY, WASHINGTON, DESCRIBED AS FOLLOWS: COMMENCING AT THE NORTHEAST CORNER OF THE NORTHWEST QUARTER OF THE NORTHEAST QUARTER OF SAID SECTION 26; THENCE ALONG THE CENTERUNE OF ANDOVER PARK WEST, SOUTH 0012'00" EAST 1327.40 FEET TO THE CENTERUNE OF STRANDER BOULEVARD; THENCE ALONG THE CENTERLINE OF STRANDER BOULEVARD NORTH 89'30'56" WEST 698.00 FEET; THENCE NORTH 00'29'04" EAST 30.00 FEET TO THE POINT OF BEGINNING; THENCE CONTINUING NORTH 00'29'04" EAST 341.00 FEET; THENCE NORTH 8910'58" WEST 210.00 FEET; THENCE SOUTH 00'29'04" WEST 341.00 FEET TO THE NORTH LINE OF STRANDER BOULEVARD; THENCE ALONG THE NORTHERLY RIGHT OF WAY OF STRANDER BOULEVARD SOUTH 0810'58" EAST 210.00 FEET TO THE POINT OF BEGINNING.