Part 5 Preparing (and reviewing) a project specific WQMP

Transcription

1 Part 5 Preparing (and reviewing) a project specific WQMP

2 312 Let s summarize where we ve been and what s next Part 1. Regulations Part 2. Pollutants Part 3. Solutions Site Design BMPs Source Control BMPs Treatment Control BMPs Part 4. The WQMP Responsibilities Developer Planning Engineering Part 5 Project Specific WQMP

3 313 How is a WQMP developed? Huh? Exhibit A

4 314 Where do we get the template? Get it from the Flood Control District website Or from from the RWQCB website: WQMP_ pdf

5 315 As we walk thru the template we will Consider a hypothetical project Project Specifics A 2.5 acre commercial/ light Industrial project in Moreno Valley east of March ARB Drains to local Storm Drain system which discharges into the Perris Valley Storm Drain

6 316 The contents of a Project Specific WQMP The Permittees developed a template Ensures consistency Easy for the development community Downloadable MS Word format Click and enter Easy for the reviewers

7 317 The contents of a Project Specific WQMP Owner certifies Implementation Pass info to facility occupants, operators, etc.

8 318 The contents of a Project Specific WQMP Owner certifies Transference to new owners Owner should sign Or legal representative not his secretary not the engineer

9 319 The contents of a Project Specific WQMP Nice Standard Format. Looks like Caltrans SWPPP format!

10 320 The contents of a Project Specific WQMP Hey, This looks simple!

11 321 The contents of a Project Specific WQMP I m I m sure sure it it won t won t cost cost very very much! much!

12 322 The contents of a Project Specific WQMP

13 323 The contents of a Project Specific WQMP Cities should clarify Cities what should is needed clarify what for is their needed base for mapping their base mapping

14 324 The contents of a Project Specific WQMP Only Only the applicable features are shown Example: Site Plan for a tentative tract map includes an overlay of Rough Grading Plan Precise Grading plan Landscape Plan Storm Drain Plan Hydrology Map

15 325 The contents of a Project Specific WQMP Appendix G must have copies of the: CC&Rs Also Copies of the mechanisms for: Maintenance Funding Transfer

16 326 The contents of a Project Specific WQMP Site Characterization

17 327 The contents of a Project Specific WQMP Site Characterization Receiving Water Information

18 328 The contents of a Project Specific WQMP Additional instructions on identifying downstream receiving waters is in next section.. Section III Pollutants of Concern Heads up. This is a little bit out of order

19 329 The contents of a Project Specific WQMP Identify the proximate receiving waters: Use hydrologic unit basin numbers Proximate is a relative term. What does it mean?

20 330 What is Proximate? How far downstream do we go? The Great Debate. Dictionary definition of of Proximate: Very Very near near or or next, next, as as in in space, space, time, time, or or order. order. It s It s still still a relative term term It s easy for the Coastal Communities.. San Bernardino Co. is considering stopping the downstream analyses at Prado Dam Big Bear Lake wants to look no further than the lake There are proposals to vary the downstream analysis based upon the size of the development Co-permittees will have to make the judgment call until further direction is issued. Existing and future TMDLs may provide guidance for how far to go. An analysis of downstream impacts may be warranted.

21 331 Whatever you decide, It ll require a local or regional map to determine the down stream receiving waters The Water Quality Control Plan has a map but it doesn t show enough detail (See below) Future on-line resources may be available

22 332 How do we know what the downstream waters are? Suggested Resources: Riverside County Flood Control District City Engineering Department USGS This is the San Jacinto Watershed Map form the SARWQCB website Good for Projects w/in the San Jacinto Watershed

23 From our mapping we find out where our project drains Perris Valley Drain to San Jacinto River to Canyon Lake to San Jacinto River Lower Reach to Lake Elsinore to Downstream..river??? If Lake Elsinore Overflows The Santa Ana River to Prado Dam to Lower Santa Ana River Reaches to The Pacific Ocean Our Our site site OK. We ve identified the downstream receiving waters. Now let s get to those Hydrologic Unit Numbers Canyon Lake and Lake Elsinore,, along with their TMDLs provide a reasonable point for the project s proximate receiving waters. 333

24 334 Get Hydrologic Unit Basin Numbers from the Basin Plan Basin Basin Plans Plans

25 335 Here s what we find. Search A search of the 200 page document reveals that the Perris Valley Storm Drain does not have a Hydrologic Unit Number However, the San Jacinto River does. So does Canyon Lake and Lake Elsinore Table from the the basin plan plan

26 336 Enter the Receiving Waters into the table Table from the the WQMP template San Jacinto River Reach 4 HU# , San Jacinto River Reach 3 HU# Canyon Lake HU# , We re assuming that the analysis will end at Lake Elsinore due to the TMDL San Jacinto River Reach 1 HU# , Lake Elsinore HU# Table from the the basin plan plan

27 337 Enter Designated Beneficial Use into the table San Jacinto River Reach 4 HU# , San Jacinto River Reach 3 HU# MUN,AGR,GWR REC1,REC2, WARM,WILD Go thru the same for the other reaches Canyon Lake HU# , San Jacinto River Reach 1 HU# , Lake Elsinore HU#

28 338 Enter data for the remaining San Jacinto River Reaches San Jacinto River Reach 4 HU# , San Jacinto River Reach 3 HU# MUN,AGR,GWR REC1,REC2, WARM,WILD MUN,AGR,GWR REC1,REC2, WARM,WILD Canyon Lake HU# , San Jacinto River Reach 1 HU# , MUN,AGR,GWR REC1,REC2, WARM,WILD Lake Elsinore HU#

29 339 For the Lakes Table from the the basin plan plan

30 340 Enter data for the remaining San Jacinto River Reaches San Jacinto River Reach 4 HU# , San Jacinto River Reach 3 HU# Canyon Lake HU# , San Jacinto River Reach 1 HU# , Lake Elsinore HU# MUN,AGR,GWR REC1,REC2, WARM,WILD MUN,AGR,GWR REC1,REC2, WARM,WILD MUN,AGR,GWR REC1,REC2, WARM,WILD MUN,AGR,GWR REC1,REC2, WARM,WILD MUN, REC1,REC2, WARM,WILD

31 341 Now check the 303(d) listing Check to see if the listed receiving waters are on the 303(d) list. 303(d) list: list:

32 342 PDF file showing impaired water bodies in the Santa Ana Region

33 343 A search for San Jacinto River shows that it is not and impaired water body.. Search

34 344 Back to the table.. San Jacinto River Reach 4 HU# , San Jacinto River Reach 3 HU# Canyon Lake HU# , San Jacinto River Reach 1 HU# , Lake Elsinore HU# None None None MUN,AGR,GWR REC1,REC2, WARM,WILD MUN,AGR,GWR REC1,REC2, WARM,WILD MUN,AGR,GWR REC1,REC2, WARM,WILD MUN,AGR,GWR REC1,REC2, WARM,WILD MUN, REC1,REC2, WARM,WILD

35 345 A search for Canyon Lake shows that it is impaired.. Search

36 346 Back to the table again.. San Jacinto River Reach 4 HU# , San Jacinto River Reach 3 HU# Canyon Lake HU# , San Jacinto River Reach 1 HU# , Lake Elsinore HU# None None Nutrients, Pathogens None MUN,AGR,GWR REC1,REC2, WARM,WILD MUN,AGR,GWR REC1,REC2, WARM,WILD MUN,AGR,GWR REC1,REC2, WARM,WILD MUN,AGR,GWR REC1,REC2, WARM,WILD MUN, REC1,REC2, WARM,WILD

37 347 A search for Lake Elsinore shows that it too is impaired.. Search

38 348 Back to the table again.. San Jacinto River Reach 4 HU# , San Jacinto River Reach 3 HU# Canyon Lake HU# , San Jacinto River Reach 1 HU# , Lake Elsinore HU# None None Nutrients, Pathogens None Nutrients, Organics, Low Dissolved Oxygen sediment/siltation toxicity MUN,AGR,GWR REC1,REC2, WARM,WILD MUN,AGR,GWR REC1,REC2, WARM,WILD MUN,AGR,GWR REC1,REC2, WARM,WILD MUN,AGR,GWR REC1,REC2, WARM,WILD MUN, REC1,REC2, WARM,WILD

39 349 The last column of the table says to Insert distance of Project to RARE designated waters.. San Jacinto River Reach 4 HU# , None MUN,AGR,GWR REC1,REC2, WARM,WILD San Jacinto River Reach 3 HU# None MUN,AGR,GWR REC1,REC2, WARM,WILD Canyon Lake HU# , Nutrients, Pathogens MUN,AGR,GWR REC1,REC2, WARM,WILD San Jacinto River Reach 1 HU# , Lake Elsinore HU# None Nutrients, Organics, Low Dissolved Oxygen sediment/siltation toxicity MUN,AGR,GWR REC1,REC2, WARM,WILD MUN, REC1,REC2, WARM,WILD From the Basin Plan

40 Our water bodies were not listed as RARE San Jacinto River Reach 4 HU# , None AGR,GWR,REC1, REC2,WARM, WILD Not Designated As RARE If we did have a RARE beneficial use.. 17 miles, or 300ft, etc. Distance from our project discharge point to the RARE water body 350

41 351 The contents of a Project Specific WQMP Next, compare the expected pollutants with the 303(d) listed impairments downstream

42 352 Remember the table we discussed earlier.. Table from WQMP Exhibit B

43 Let s apply this to our project. 353 I think that means that if solvents are likely to be used, it is a potential pollutant

44 354 Legacy Pollutants Legacy pollutants are pollutants on a site resulting from past uses of the land. Legacy pollutants must be identified and their potential for exposure to storm water addressed in the WQMP. Legacy pollutants can be mobilized by Contact with runoff Erosion of contaminated soils Phase I studies and soils reports are possible sources of information on legacy pollutants. Include legacy pollutants in the expected and potential pollutant listings for the project.

45 355 Check off the expected and potential pollutants form the site This table is not in the Riv Co. WQMP I borrowed from San Bdo Co.

46 356 Compare the pollutants to the Down Stream Impairments Canyon Lake HU# , Nutrients, Pathogens Lake Elsinore HU# Nutrients, Organics, Low Dissolved Oxygen sediment/siltation toxicity Bacteria Bacteria and and Viruses Viruses are are Pathogens Pathogens Toxicity

47 The Pollutants of Concern are those which are causing or contributing to receiving water impairment and are associated with the proposed project These four are pollutants of concern for our site Toxicity 357

48 358 On to Section 4 Hydrologic Conditions of Concern Changes in stream flow characteristics: Volume Velocity Infiltration Flow Frequency Duration Peaks Time of Concentration Quality Sediment loads

49 359 The contents of a Project Specific WQMP We have a HCOC if the change would have a significant impact on: Downstream erosion Stream habitat Alone or cumulatively

50 360 The contents of a Project Specific WQMP Proponents must address HCOC unless:

51 361 The contents of a Project Specific WQMP Proponents must address HCOC unless:

52 362 The contents of a Project Specific WQMP Proponents must address HCOC unless: Match existing conditions for: 2yr and 10 yr storm Flow rate Volume Velocity Duration

53 363 With Detention Basins, we can match the flow rates and velocities. But not the duration Even if flows were detained to mimic the flow rates and velocities, the duration would be increased Infiltration may allow for mimicking of existing conditions

54 364 Insert the condition met or.. Refer to section 4.4 of the WQMP if none of the conditions are met.

55 If none of the conditions are met. WQMP section Nice! Another hard-to to-define term, Significant What does all this say? That the applicant has to do an extensive analysis!

56 366 Wait there s more.. If adverse impacts are identified, the project can still move forward Build a Detention Basin!

57 or. In summary: If there are impacts, but we ve done everything reasonable to minimize the impacts, it appears to be ok. Discussion. Dictionary Dictionary Definition Definition Mitigate: Mitigate: To To Moderate Moderate in in force force or or intensity intensity To To become become milder milder 367

58 368 Wake up call What was the name of the river that caught fire in 1952? What state was it in? Answer: Cuyahoga River in Ohio

59 On to Section 4. Whew! 369

60 Table 1. Site design Concept 1 370

61 371 Table 1. Site design Concept 1 Text Text Explanation Explanation Required Required When When Not Not Implementing Implementing the the Concept: Concept: No No native native trees trees are are present present on on the the site. site. Native Native shrubs shrubs will will be be removed. removed. Native, Native, drought drought tolerant tolerant trees trees and and shrubs shrubs will will be be used used in in the the landscape landscape areas. areas.

62 372 Table 1. Site design Concept 1 Text Text Explanation; Explanation; Infiltration Infiltration will will not not be be used used due due to to light light Industrial Industrial land land use. use.

63 373 Table 1. Site design Concept 1 Text Text Explanation; Explanation; Infiltration Infiltration will will not not be be used used due due to to light light Industrial Industrial land land use. use.

64 374 Table 1. Site design Concept 1 Text Text Explanation; Explanation; Reduced Reduced street street widths widths were were discussed discussed with with the the city, city, but but not not used used due due to to potential potential large large truck truck traffic traffic and and safety safety issues. issues.

65 375 Table 1. Site design Concept 1 Some redundancies here. Typo?

66 376 Table 1. Site design Concept 2 Use Use one one or or more more of of the the following following per per section section

67 377 Table 1. Site design Concept 2 N/A

68 Table 2. Source Control BMPs Commercial /ind site Commercial /ind site Commercial /ind site None proposed None proposed 378

69 Table 2. Source Control BMPs 379 After filling out the table: Provide a narrative description of the Source Control BMPs Implementation Inspection Maintenance Access issues Show applicable BMPs on site map

70 380 Remember our table that established the Pollutants of concern Since we expected and potential pollutants which match downstream impairments. We ll have to chose BMPs with High or medium efficiencies for: Nutrients, Organic Compounds, Sediment, and Oxygen Demanding Substances

71 Table 3. Treatment Control BMP selection Matrix 381 Yes Yes Our Our Pollutants of of Concern: Nutrients Organic Compounds Sediment Oxygen Demanding Substances Yes No Yes No No No No

72 Table 3. Treatment Control BMP selection Matrix 382 Yes Yes Yes No Yes No No No No

73 Table 3. Treatment Control BMP selection Matrix 383 The footnotes on this page are not in the correct order. Look for an amendment to this table.

74 Table 3. Treatment Control BMP selection Matrix 384 Yes Yes Yes No Yes No No No No

75 Table 3. Treatment Control BMP selection Matrix 385 Yes Yes Yes No Yes No No No No

76 Remember the restrictions on infiltration 386

77 Table 3. Treatment Control BMP selection Matrix 387 Yes Yes Yes No Yes No Yes No No

78 Table 3. Treatment Control BMP selection Matrix 388 Yes Yes Yes No Yes No No No No

79 Table 3. Treatment Control BMP selection Matrix 389 Yes Yes Yes No Yes No No No No

80 Table 3. Treatment Control BMP selection Matrix 390 Yes Yes Yes No Yes No No No No

81 Table 3. Treatment Control BMP selection Matrix 391 Yes Yes Yes No Yes No No No No

82 392 In summary: The best choices are the Detention basins or the Sand Filters Yes Yes Yes No Yes No No No No

83 393 Addressing Other Project Pollutants Other pollutants include expected and potential pollutants that are not causing impairments.

84 Other Pollutants do not need to be addressed by a BMP rated H or M. 394 Addressing Other Pollutants Our two most promising BMPs for our POCs Yes Yes Yes No Yes No No Also work well for the project s other pollutants No No

85 395 Wake up call The 1972 Clean Water act was so controversial that it was vetoed by the President at the time. The veto was then overridden by large majorities in both houses. Who was the president?

86

87 397 Flow- based design Per Per section of of the the Guidance

88 398 Determine the area Flow- based design Per Per section of of the the Guidance Tributary Area = 110,000sf 2.5 acres

89 399 Determine runoff coefficient Flow- based design Per Per section of of the the Guidance For our example assume: Soil type B - 50% Soil type C - 50% 90% impervious B Runoff Coeff = 0.82 C Runoff Coeff = 0.84

90 400 Determine aggregate runoff coefficient Flow- based design Per Per section of of the the Guidance For our example : 50% x.82 50% x.84 Aggregate = 0.83

91 401 Determine the BMP design flow rate Flow- based design Per Per section of of the the Guidance For our example : Q = CIA Q = 0.84 x 0.2 x 2.5 Q = 0.42 cfs Wow. That doesn t sound like a lot

92 402 How would flow based treatment controls work on a small commercial site? Fitting treatment controls will require re-thinking traditional drainage design Break up into smaller drainage areas Smaller Treatment Controls More of them

93 403 How would bio strips work? Eliminate gutters Sheet Flow parking lot Problem Separating larger Storm Flows

94 404 How would Bio-Swales work? Re-direct flow patterns Problem separating larger Storm Flows may require a parallel underground system

95 405 Volume- based design Per Per section of of the the Guidance The WQMP has this approach It has been enhanced in the BMP design handbook

96 406 From the BMP design handbook.. Volume- based design

97 407 From the BMP design handbook.. Volume- based design The project site is plotted on a map The slope value is determined

98 408 From the BMP design handbook.. Volume- based design The project site is plotted on a map The slope value is determined Our site = 0.87

99 409 From the BMP design handbook.. Volume- based design Plot our slope value of 0.87 on the right side of the chart Draw a straight line to the origin Then put it aside for more information

100 410 Determine runoff coefficient C factor Volume- based design C = 0.858i i i C = C =

101 411 Determine 85 th percentile unit storage volume Or use the Figure 1 chart Volume- based design 3 C = 0.73

102 412 From the BMP design handbook.. Volume- based design Plot our runoff coefficient Determine the 85 th percentile storm Vu = 0.62 in-ac/ac

103 413 Determine the total volume Volume- based design Vbmp = Vu u x A Vbmp = 0.62 x 2.5ac Vbmp = 1.55 in-ac = ft-ac = 5626 cf That s equates to a 53 x 53 x 2 deep basin

104 414 The design handbook gives nice worksheets for the calculations. Flow and volume based design

105 415 The District has also prepared nice example design calculations for several treatment controls.

106 Last Part Other Important Information

107 417 Other Important Information from the WQMP Changes in the development may require changes to the WQMP Example: Changing use from retail to restaurant Cities must have a mechanism in their approval process to enforce this provision

108 418 Other Important Information from the WQMP WQMP requirements must be transferred. See WQMP Exhibit F for Sample

109 419 Other Important Information from the WQMP template Project Specific WQMP must describe O & M procedures Activities Time Schedule Frequency of activities Responsible parties Inspection procedures Record Keeping Monitoring

110 420 Other Important Information from the WQMP template Funding for O&M By city CFD HOA

111 421 Other Important Information from the WQMP template Use this to learn more about the pollutants and their effects on the environment

112 Anything else? Make sure your Municipal Code covers the requirements Notification of of intent and and compliance with with general permits. A. A. Each industrial discharger, discharger associated with with construction activity, or or other discharger, described in in any any general stormwater permit addressing such discharges, as as may may be be adopted by by the the United States Environmental Protection Agency, the the State Water Resources Control Board, or or the the California Regional Water Quality Control Board, Santa Ana Ana Region, shall shall provide NOI, NOI, comply with, with, and and undertake all all other activities required by by any any general NPDES stormwater permit applicable to to such discharges. B. B. Each discharger identified in in an an individual NPDES permit or or discharge order relating to to storm- water discharges shall shall comply with with and and undertake all all activities required by by such permit or or order. (Ord (part), 1995) 422

113 423 Are we done yet? Revise your Development applications Inform Applicants at the earliest stage (example: Rancho Cucamonga) Planning Planning Department Department - - Preliminary Preliminary Review Review Preliminary Preliminary Review Review It It is is recommended recommended that that you you submit submit preliminary preliminary "concept" "concept" plans plans prior prior to to filing filing a a formal formal Development Development Review Review application. application. The The Preliminary Preliminary Review Review process process is is provided provided as as a a courtesy courtesy to to developers developers and and enables enables staff staff to to provide provide you you with with direction direction on on major major issues issues and and technical technical requirements requirements prior prior to to the the expense expense of of detailed detailed plan plan preparation. preparation. Preliminary Preliminary Review Review may may be be submitted submitted at at any any time time to to the the Planning Planning Division. Division. Submittal Submittal checklists checklists are are available available from from the the Planning Planning Division. Division. Pre-Application Pre-Application Review Review The The Planning Planning Commission Commission offers offers an an opportunity opportunity for for a a developer developer to to present present sketches sketches of of their their project project during during the the early early stages stages of of concept concept plan plan preparation. preparation. The The Pre-Application Pre-Application Review Review process process provides provides the the developer developer with with valuable valuable design design input input from from the the Planning Planning Commission Commission prior prior to to expense expense of of formal formal application application for for Development Development Review. Review. This This process process is is highly highly recommended recommended for for developers developers doing doing their their first first project project within within the the City City of of Rancho Rancho Cucamonga, Cucamonga, for for projects projects in in prominent prominent locations, locations, for for projects projects which which are are larger larger than than acres, acres, and and for for projects projects which which depart depart from from the the City's City's design design goals goals and and policies. policies. Submittal Submittal checklists checklists are are available available from from the the Planning Planning Division. Division.

114 424 Ca we go now? Revise your Development applications Inform Applicants at the earliest stage Tent map CUP application

115 425 Will this ever end? Let s look into the crystal ball. More public education campaigns TMDLs Retrofitting existing urban area with Treatment controls More testing and targeting of specific pollutants Determining impacts of Infiltration devices Possible future removal of infiltration devices More First Flush Treatment Systems - Treat it like sewage More expenditures

116 426 Closing: We can reduce pollutants in our Waters It wont be cheap It will take some effort We all play a part in the process

117 427 Questions/ Contacts AEI-CASC Engineering Rick Sidor, PE, CPESC Jason Uhley