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HomeMy WebLinkAboutCT 02-25; NORTHPARK LA COSTA; STORM WATER TECHNICAL REPORT; 2004-01-06STORM WATER TECHNICAL REPORT for NORTHPARK PROJECT City of Carlsbad Track No. 02-25 Prepared by: SnSpem-Dys Assadatei Dated: January 6, 2004 Job No. CA1133 o storm Water Standards 4/03/03 VI. RESOURCES & REFERENCES APPENDIX A STORM WATER REQUIREMENTS APPLICABILITY CHECKLIST Complete Sections 1 and 2 of the following checklist to detennine your project's pemanent and construction storm water best management practices requirements. This form must be completed and submitted with your pennit application. Section 1. Permanent Storm Water BMP Requirements: If any answers to Part A are answered "Yes," your project Is subject to the "Priority Project Permanent Storm Water BMP Requirements," and "Standard Permanent Storm Water BMP Requirements" in Section III, "Permanent Storm Water BMP Selection Procedure" in the Storm Water Standards manual. If all answers to Part A are "No," and any answers to Part B are 'Yes," your project is only subject to the "Standard Permanent Storm Water BMP Requirements". If every question in Part A and B is answered "No," your project is exempt from permanent stonn water requirements. Part A: Determine Priority Project Permanent Storm Water BMP Requirements Does the project meet the definition of one or more of the priority project categories?* Yes No 1. Detached residential development of 10 or more units 2. Attached residential development of 10 or more units X 3. Commercial development greater than 100,000 square feet 4. Automotive repair shop 5. Restaurant X 6. Steep hillside development greater than 5,000 square feet 7. Project discharging to receiving waters within Environmentally Sensitive Areas X 8. Parking lots greater than or equal to 5,000 ft^ or with at least 15 parking spaces, and potentially exposed to urban runoff X 9. Streets, roads, highways, and freeways which would create a new paved surface that is 5,000 square feet or greater * Refer to the definitions section in the Stom? Wafer Standards for expanded definitions of the priority project categories. Limited Exclusion: Trenching and resurfacing work associated with utility projects are not considered priority projects. Parking lots, buildings and other structures associated with utility projects are priority projects if one or more of the criteria in Part A is met. If all answers to Part A are "No", continue to Part B. 30 Storm Water Standards 4/03/03 Does the project propose: Yes No 1. New impervious areas, such as rooftops, roads, parking lots, driveways, paths and sidewalks? X 2. New pervious landscape areas and irrigation systems? X 3. Permanent structures within 100 feet of any natural water body? / 4. Trash storage areas? X 5. Liquid or solid material loading and unloading areas? K 6. Vehicle or equipment fueling, washing, or maintenance areas? X 7. Require a General NPDES Permit for Storm Water Discharges Associated with Industrial Activities (Except construction)?* X 8. Commercial or industrial waste handling or storage, excluding typical office or household waste? 9. Any grading or ground disturbance during construction? X 10. Any new storm drains, or alteration to existing storm drains? K *To find out if your project is required to obtain an individual General NPDES Permit for Storm Water Discharges Associated with Industrial Activities, visit the State Water Resources Control Board web site at, www.swrcb.ca.gov/stormwtr/industrial.html Section 2. Construction Storm Water BMP Requirements: If the answer to question 1 of Part C is answered "Yes," your project is subject to Section IV, "Construction Storm Water BMP Performance Standards," and must prepare a Storm Water Pollution Prevention Plan (SWPPP). If the answer to question 1 is "No," but the answer to any of the remaining questions is "Yes," your project is subject to Section IV, "Constmction Storm Water BMP Performance Standards," and must prepare a Water Pollution Control Plan (WPCP). If every question in Part C is answered "No," your project is exempt from any construction storni water BMP requirements. If any of the answers to the questions in Part C are "Yes," complete the construction site prioritization in Part D, below. Part C: Determine Construction Phase Storm Water Requirements Would the project meet any of these criteria during construction? Yes No 1. Is the project subject to California's statewide General NPDES Permit for Storm Water Discharges Associated With Construction Activities? X 2. Does the project propose grading or soil disturbance? X 3. Would storm water or urban runoff have the potential to contact any portion of the construction area, including washing and staging areas? X 4. Would the project use any construction materials that could negatively affect water quality if discharged from the site (such as, paints, solvents, concrete, and stucco)? X 31 storm Water Standards 4/03/03 Part D: Determine Construction Site Priority In accordance with the Municipal Permit, each construction site with construction stonn water BMP requirements must be designated with a priority: high, medium or low. This prioritization must be completed with this form, noted on the plans, and included in the SWPPP or WPCP. Indicate the project's priority in one of the check boxes using the criteria below, and existing and surrounding conditions of the project, the type of activities necessary to complete the construction and any other extenuating circumstances that may pose a threat to water quality. The City reserves the right to adjust the priority of the projects both before and during construction. [Note: The construction priority does NOT change construction BMP requirements that apply to projects; all constmction BMP requirements must be identified on a case-by-case basis. The construction priority does affect the frequency of inspections that will be conducted by City staff. See Section IV. 1 for more details on construction BMP requirements.] • A) High Priority 1) Projects where the site is 50 acres or more and grading will occur during the rainy season 2) Projects 5 acres or more. 3) Projects 5 acres or more within or directly adjacent to or discharging directly to a coastal lagoon or other receiving water within an environmentally sensitive area Projects, active or inactive, adjacent or tributary to sensitive water bodies JSI B) Medium Priority 1) Capital Improvement Projects where grading occurs, however a Storm Water Pollution Prevention Plan (SWPPP) is not required under the State General Construction Pennit (i.e., water and sewer replacement projects, intersection and street re-alignments, widening, comfort stations, etc.) 2) Permit projects in the public right-of-way where grading occurs, such as installation of sidewalk, substantial retaining walls, curb and gutter for an entire street frontage, etc., however SWPPPs are not required. 3) Permit projects on private property where grading permits are required, however. Notice Of Intents (NOIs) and SWPPPs are not required. • C; Low Priority 1) Capital Projects where minimal to no grading occurs, such as signal light and loop installations, street light installations, etc. 2) Permit projects in the public right-of-way where minimal to no grading occurs, such as pedestrian ramps, driveway additions, small retaining walls, etc. 3) Permit projects on private property where grading permits are not required, such as small retaining walls, single-family homes, small tenant improvements, etc. 32 TABLE OF CONTENTS Page 1. DESCRIPTION OF PROPOSED PROJECT 1 2. ANTICIPATED AND POTENTIAL POLLUTANTS GENERATED BY PROPOSED PROJECT ^ A. Pollutants from Project Area "I B. Pollutants of Concern 2 C. Conditions of Conoem 2 3. ESTABLISH POST-DEVELOPMENT STORM WATER BMPs 3 A. Site Design BMPs 3 B. Source Control BMPs 3 C. Treatment Control BMPs 4 4. CONSTRUCTION BMPs 4-6 5. ONGOING STORM WATER BMP MAINTENANCE 6 6. SUMMARY/CONCLUSION 7 7. REFERENCES 8 t APPENDIXES Appendix A- Overview of Carlsbad Watershed Beneficial Water Uses of Carlsbad Watershed Appendix B- Water Quality Standards Inventory Database of San Marcos Creek Appendix C- Site Hydrology/Hydraulic Analysis (Pre and Post-Conditions) Appendix D- Site Plan DESCRIPTION OF PROPOSED PROJECT The project is located on the southwest comer of Levante Street and La Costa Avenue, in the City of Carisbad, San Diego County, California (Assessor Parcel Numbers 223-170-21 & 22). The site is bounded by La Costa Avenue to the north, Levante Street to the east, single-family residences to the west and town homes to the south. The site is approximately 1.54 acres. The site is currently vacant, but it has been previously graded in 1972 to 1974. The existing pads on the site are separated in elevation, approximate 8 feet, more or less. There is no existing vegetation on the site, excepting four existing street trees along the Levante Street right-of- way. The site runoff does not accommodate any offsite runoff. The drainage over the site is via surface flow toward the southwest, discharging on to Levante Street then into the City of Carisbad storm drain system. According to the USDA Conservation Service Soil Survey, San Diego Area, California published in December 1973, the survey classifies the project surface soils as HrC2, Huerhuero loam with surface slopes in the 5 to 9% range. The Huerhuero soil consists of moderately well drained loams that have clay subsoil. The mean annual precipitation is between 10 to 12 inches. The available soil capacity of holding water is 4 to 5 inches. In a representative profile, the surface layer is brown and pale-brown loam about 12 inches thick. The upper part of the subsoil is brown, moderately alkaline clay (to the depth of 41 inches or more). Below it, brown, mildly alkaline clay loam and sandy loam extends to a depth of 60 inches or more. The erosion hazard is moderate. The project proposes to construct 12 detached multi-family residential units. The project proposes to have accesses from Levante Street to a new 24- foot wide private road, Corte Tradicion. The existing water and sewer services shall be killed. Water and sewer mains will be extended along Corte Tradicion, the proposed private road, to serve the new residences. ANTICIPATED AND POTENTIAL POLLUTANTS GENERATED BY PROPOSED PROJECT A. Pollutants from Project Area - The site Is within the San Marcos Creek Hydrologic Area (904.5) which is part of Carisbad Watershed. The impaired water body pollutants which were recently listed in the Clean Water Act Section 303(d) are copper, lead, zinc, cadmium, coliform bacteria, sedimentation, nutrients and eutrophic. San Marcos Creek is listed as 303(d)-impaired water bodies for coliform bacteria. According to the Table 2 in The City of Carlsbad Standard Urban Stonn Water Mitigation Plan (April 2003), the Anticipated and Potential Pollutants Generated by the Detached Residential Development are as follows: Sediments (anticipated) Nutrients (anticipated) Trash & Debris (anticipated) Oxygen Demanding Substances (anticipated) Oil & Grease (anticipated) Bacteria & Viruses (anticipated) Pesticides (anticipated) B. Pollutants of Concern - Based on the impaired water bodies list and the pollutants generated by land use type, the primary pollutants of concern for the proposed project are sediments and coliform bacteria, nutrients, sediment, trace metals, and toxics. C. Conditions of Concern - The project site is contributory to the San Marcos Creek Hydrologic Subarea (904.5) of the Carisbad Hydrologic Area (904.0) which consists of approximately 210 square miles of watershed. This project area represents approximately 0.001 percent of the total watershed. Peak stormwater discharges from the site in the pre- development conditions during the 100-year, six-hour intensity stonn will be approximately 4.04 cubic feet per second. The peak stormwater discharges from the site in the post-development conditions during 100- year, six-hour intensity storm will be approximately 5.24 cubic feet per second. The increase of peak discharge is due to the increase of impervious surface areas. PRE-DEVELOPMENT POST-DEVELOPIMENT 0% OF IMPERVIOUS SURFACE AREAS 61% OF IMPERVIOUS SURFACE AREAS The site cunrently generates sediments, trash and debris, due to the uncontrolled runoff discharging over unprotected bare land. The post-development site shall reduce the sediments as well as trash and debris which are the primary pollutants of concern from the development. 3. ESTABLISH POST-DEVELOPMENT STORM WATER BMPs A. Site Design BMPs - The proposed project consists of 12 detached two-story residences with a 24-foot wide access private road. Approximately 61% of the site is impervious surface including rooftops, concrete drives, walkways, parking areas and private road. 1) The project proposes to construct two-story buildings with minimum driveway and walkway widths to maximize building density and minimize impervious surface areas. 2) The post-development drainage is designed to drain runoffs from rooftops and impervious surface areas into the adjacent landscaping areas prior to discharging off site. 3) The existing slopes along the northwesteriy boundary will be protected by the installation of retaining walls at the tops of slopes; the runoffs are also directed away from the slopes. B. Source Control BMPs - Preventing the pollutants from generating or controlling the pollutant sources is the most effective way to treat the pollutants. Installation of the treatment BMP devise near the pollutant source is better than treating the polluted water at the downstream. 1) There will be no outdoor storages of material. Therefore, the potential for toxic compounds, oil and grease, heavy metals, nutrients and suspended solids to enter storm drain system is reduced or eliminated. The use of landscape fertilizers will be controlled and utilized sparingly. Fertilizer use will be controlled in accordance with local, state and federal regulations. The use of pesticides is a potential pollution source. Pesticide use will be eliminated to the most practicable extent. When pesticide use is necessary, pesticides will be applied in accordance with local, state, and federal regulations. 2) There will be no outdoor trash enclosure. The individual residence shall store trash in containers with attached lids. The schedule of trash pick up is weekly, so they should never be over-filled. Site grounds will be maintained and litter collected and properiy disposed of. Driveways will be maintained, litter collected, and periodically swept. 3) The 12 proposed residences are sharing one 24-foot paved private road, Corte Tradicion. The runoff from this private road is collected in a vegetated basin, located at the southwest comer of the property. Driveways and vehicle parking areas are potential sources of oil and grease pollution. Areas of vehicle activity will be maintained and periodically swept. Any spills shall be clean up immediately. C. Treatment Control BMPs - The proposed development is classified as a priority project. The design of the treatment control BMP structure of the project is required. 1) The project proposes to construct a 70'x4.17' retention basin, located at the southwest corner of the site. See the calculations in the attached Hydrology/Hydraulic Analysis in Appendix D. 2) The pollutant sources of the development are the access driveways, the private road. The runoffs from these areas are directed to the vegetated retention basin which equipped with bio-filter turf to control sediments and other pollutants. 3) The drainage and treatment system of the development project have a very minimal potential to affect ground water. The stormwater runoff from most impervious surface is pretreated by flowing through landscaping areas prior to discharging into the retention basin for volume treatment. 4. CONSTRUCTION BMPs The following BMPs listed and detailed in the Construction Activity, Best Management Practices Handbook, published by Camp, Dresser, and McKee, March 1993 are selected as being appropriate for this specific site and should be implemented during the construction phase. It is important that the selected construction BMP's are maintained and functional during the construction period and until all permanent BMPs are fully operational. • ESC1- Scheduling: This activity provides for the sequencing of construction activities to reduce the amount and duration of soil exposed to erosion by wind, rain, runoff and vehicle tracking. • ESC10- Seeding and Planting: Normally done at the conclusion of site disturtDance to become a permanent BMP, seeding and planting of grasses, shrubs, trees and/or ground covers provides long-term stabilization of soil. • ESC11- Mulching: Mulching is used to temporarily or permanently stabilize cleared or freshly seeded areas. Hydro seed Is an example of seed and mulch being placed at the same time. Hydro seed Is expected to be used to mitigate suri'ace soil disturbance occurring In the process of constructing the retention basin. ESC20- Geotextiles and Mats: Matting made of natural or synthetic materials may be used to temporarily stabilize slope areas and shallow swales. ESC21- Dust Control: Dust control measures are used to stabilize soil from wind erosion, and reduce dust generated by construction activities. Periodic watering will address these issues. ESC24- Stabilized Construction Entrance: A stabilized pad of aggregate underiain with filter cloth located at the point where traffic will enter or leave the construction site will significantly reduce the amount of sediment tracked off-site. ESC30- Earth Dike: The temporary earth dike shall be used to channel drainage from the graded pads to temporary sediment traps (see ESC55). ESC30- Earth Dike: The temporary earth dike shall be used to channel drainage from the graded pads to temporary sediment traps (see ESC55). ESC31- Drains and Swales: Temporary drains and swales shall be used to divert runoff around the construction site, to divert runoff from stabilized areas around disturbed areas and to direct runoff into sediment traps. ESC50- Silt Fence: A silt fence that detains sediment-laden water shall be used at the down slope limits of site disturbance to promote sedimentation behind the fence, while releasing the water. ESC52- Gravel Bag Barrier: Stacking gravel bags along a level contour creates a barrier, which detains sediment-laden water, ponding water upstream of the barrier and promoting sedimentation. ESC55- Sediment Trap: Sediment traps shall be used to settle out sediment from runoff leaving the site. CA 2- Paving Operations: Prevent or reduce the discharge of pollutants from paving operations, using measures to prevent runon and runoff pollution, properiy disposing of wastes and training employees and subcontractors. CA 3- Structure Construction and Painting: Prevent or reduce the discharge of pollutants to storm water from structure construction and painting by enclosing or covering or berming building material storage areas, using good housekeeping practices, using safer alternative products and training employees and subcontractors. CA 10- Material Storage and Delivery: Prevent or reduce the discharge of pollutants to storm water from material delivery and storage by minimizing the storage of hazardous materials on-site, storing materials in a designated area, installing secondary containment, conducting regular Inspections and training employees and subcontractors. • CA 11- Material Use: Prevent or reduce the discharge of pollutants to storm water from material use by using alternative products, minimizing hazardous material use on-site and training employees and subcontractors. • CA 12- Spill Prevention and Control: Prevent or reduce the discharge of pollutants to storm water from leaks and spills by reducing the chance for spills, stopping the source of spills, containing and cleaning up spills, properiy disposing of spill materials and training employees. • CA 20- Solid Waste Management: Prevent or reduce the discharge of pollutants to storm water from solid or construction waste by providing designated waste collection areas and containers, arranging for regular disposal and training employees and subcontractors. • CA 23- Concrete Waste Management: Prevent or reduce the discharge of pollutants to storm water from concrete waste by conducting washout off-site, performing on-site washout in a designated areas and training employees and subcontractors. • CA 24- Sanitary Waste Management: Prevent or reduce the discharge of pollutants to storm water from sanitary waste by providing convenient, well-maintained facilities and arranging for regular service and disposal. • CA 31- Vehicle and Equipment Fueling: Prevent or reduce the discharge of pollutants to storm water by using off-site facilities, fueling in designated areas only, enclosing or covering stored fuel. Implementing spill controls and training employees and subcontractors. • CA 40- Employee/Subcontractor Training: Employee/subcontractor training likes maintenance or a piece of equipment, is not so much a best management practice as it is a method by which to implement BMP's. The responsibility of Implementing and maintaining the above BMP's during the construction period shall reside with the licensed contractor who is responsible for overall project construction management. In the event the owner chooses to be the project manager, the responsibility will reside with the owner. 5. ONGOING STORM WATER BMP MAINTENANCE The proposed permanent BMPs are private and within the project property. It Is a responsibility of the owner/developer/applicant to ensure the installations of these mechanisms by incorporating into the project final construction plans which will be reviewed and approved by the City of Carisbad Engineer. It is also a responsibility of the owner/developer/applicant to implement a verification of the permanent BMPs maintenance requirements which are appropriate and approved by the City of Carisbad. The verification of the maintenance program shall be submitted to the City of Carisbad prior to the project occupancy. Project proposed to construct one D-25 curb outlet on the northeriy right- of-way of Levante Street, near the southwest corner of the project. It is a publicly maintained drainage structure; therefore, the City of Carisbad will assume the responsibility for maintenance, repair or replacement of the curb outlet. 6. SUMMARY/CONCLUSION This Storm Water Technical Report has been prepared in accordance with The City of Carisbad Standard Urban Stormwater Mitigation Plan (SUSMP) dated April 2003. This plan has identified the primary potential pollutants, established the post-development BMPs (Site Design BMPs, Source Control BMPs and Treatment BMPs). The plan also indicates some of the construction BMPs which may be utilized during the construction phase. The proposed uses of the property will insignificantly Impact the receiving water body beneficial uses, if the specified best management practices are effectively implemented. 7. REFERENCES- The following references were used in the preparation of this plan: • The City of Carlsbad Standard Urban Stormwater Mitigation Plan • County of San Diego Watershed Protection, Stormwater Management, and Discharge Control Ordinance • Storm Water Quality Handbooks, Project Planning and Design Guide, CalTrans (State of California Department of Transportation), Camp Dresser & McKee, Inc., May 2000. • Staff Report for Standard Urban Storm Water Mitigation Plans and Numerical Sizing Criteria for Best Management Practices, California Regional Water Quality Control Board, San Diego Region, 2001. • California Storm Water Best Management Practice Handbooks (Construction Activity and Municipal), Camp Dresser & McKee, et al, March 1993. • California Storm Water Best Management Practice Handbooks (Industrial/Commercial), Camp Dresser & McKee, et al, March 1993. site LoC/iTlo/^ Water Quality Standards Inventory Database Water Quality Standards Inventory Database Page 1 of 3 Click on the links below to search for another waterbody. Search by Beneficial Uses Search by Keyword Search by SWRCB Region Search by Caltrans District Search by County Click on the links below to view water quality parameters for San Marcos Creek. Benetlcial Uses Water Quality Objectives Water Quality Narrative Constituents Water Quality Numeric Criteria Water Quality Bacteria Criteria Click on the links below to view comments and corrections logged or to navigate to the comments and corrections input page. Comments and Corrections Logged Comments and Coirections Input Page San Marcos Creek Water Quality Control Board Region: Click on the region number for a list of waterbodies and reported hydrologic units in that region. 9 Hydrologic Units: Click on the reported hydrologic unit for a list of waterbodies in that unit. Repoiled Hydrologic Units Published Hydrologic Units Hydrologic Units: Click on the reported hydrologic unit for a list of waterbodies in that unit. 904.51 904.51 Caltrans District: Click on the Caltrans district for a list of waterbodies and reported hydrologic units in that district. 11 Counties: Click on the reported county name for a list of waterbodies and reported hydrologic units in that county. 'Please note that reported and published counties are associated with hydrologic unit, not waterbody. Reported Counties Published Counties SAN DIEGO Location Map Watershed Map Geospatial Waterbody System Assessment Data SAN MARCOS CREEK (Includes 305(b) and 303(d) Determinations) Waterbody Beneficial Uses RWQCB Beneficial Use Click on the beneficial use for the beneficial use code and description. Use Status Potential or Existing Agricultural Supply Existing Water Contact Recreation Existing Non-Contact Water Recreation Existing Warm Freshwater Habitat Existing j Existing http://endeavor.des.ucdavis.edu/wqsid/waterbody.asp?wb fkey=3709 1/16/04 Water Quality Standards Inventory Database Page 2 of 3 Water Quality O ujectives Waterbody Reach Beneficial Use Constituent Constituent Concentration Constituent Units Constituent Details Constituent Comments NA ALL Boron 0.75 mg/L NA ALL Chloride 250 nii.; 1 NA ALL Color 20 Units - NA ALL F 1 mg/L - NA ALL Iron 0.3 mg/L - NA ALL Manganese 0.05 mg/L - NA ALL MI?AS 0.5 mg/L - NA ALL Sodium 60 mg/L - NA ALL Sulfate 250 mg/L - NA ALL IDS 500 mg/L - NA ALL Turbidity 20 NTH - Water Quality Narrative Constituents Constituent Name Constituent Description Biostimulatory Substances Inland surface waters, bays and estuaries and coastal lagoon waters shall not contain biostimulatory substances in concentrations that promote aquatic growth to the extent that such growths cause nuisance or adversely aftect beneficial uses. Color Waters shall be free of coloration that causes nuisance or adversely affects beneficial uses.The natural color offish, shellfish or other resources in inland surface waters, coastal lagoon or bay and estuary shall not be impaired. DO The dissolved oxygen concentration in ocean waters shall not at any time be depressed more than 10 percent from that which occurs naturally, as the result of the discharge of oxygen demanding waste materials. Floating Material Waters shall not contain floating material, including solids, liquids, foams, and scum in concentrations which cause nuisance or adversely affect beneficial uses. Oil and Grease Waters shall not contain oils, greases, waxes, or other materials in concentrations which result in a visible film or coating on the surface of the water or on objects in the water, or which cause nuisance or which otherwise adversely affect beneficial uses. PH The pH value shall not be changed at any time more than 0.2 pH units from that which occurs naturally .Changes in normal ambient pH levels shall not exceed 0.2 units in waters with designated marine (MAR), or estuarine (EST), or saline (SAL) beneficial uses. Changes in normal ambient pH levels shall not exceed 0.5 units in fresh waters with designated cold freshwater habitat (COLD) or warm freshwater habitat (WARM) beneficial uses. In bays and estuaries the pH shall not be depressed below 7.0 nor raised above 9.0. In inland surface waters the pH shall not be depressed below 6.5 nor raised above 8.5. Radioactivity Radionuclides shall not be present in concentrations that are deleterious to human, plant, animal, or aquatic life nor that result in the accumulation of radionuclides in the food web to an extent that presents a hazard to human, plant, animal or aquatic life. Sediment The suspended sediment load and suspended sediment discharge rate of surface waters shall not be altered in such a manner as to cause nuisance or adversely affect beneficial uses. Suspended Solids Waters shall not contain suspended and settlable solids in concentrations of solids that cause nuisance or adversely affect beneficial uses. Toxicity All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. Compliance with this objective will be determined by use of indicator organisms, analyses of species diversity, population density, growth anomalies, bioassays of appropriate duration, or other appropriate methods as specified by the Regional Board. The survival of aquatic life in surface waters subjected to a waste discharge or other controllable water quality factors, shall not be less than that for the same water body in areas unaffected by the waste discharge or, when necessary, for other control water that is consistent with requirements specified in US EPA, State Water Resources Control Board. As a minimum, compliance with this objective as stated in the previous sentence shall be evaluated with a 96-hour acute bioassay. In addition, effluent limits based upon acute bioassays of effluents will be prescribed where appropriate, additional numerical receiving water objectives for specific toxicants will be established as sufficient data become available, and source control of toxic substances will be encouraged. Temperature The natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Board that such alteration in temperature does not adversely affect beneficial uses. At no time or place shall the temperature of any COLD water be increased more than 5F above the natural receiving water http://endeavor.des.ucdavis.edu/wqsid/waterbody.asp?wb fkey=3709 1/16/04 Water Quality Standards Inventory Database Page 3 of 3 temperature. Taste and Odor Waters shall not contain taste or odor producing substances at concentrations which cause a nuisance or adversely affect beneficial uses. The natural taste and odor offish, shellfish or other Regional water resources used for human consumption Shall not be impaired in inland surface waters and bays and estuaries. Turbidity Waters shall be free of changes in turbidity that cause nuisance or adversely atfect beneficial uses. Water Quality Numeric Criteria Beneficial Use Numeric Constituent Name Numeric Constituent Detail Numeric Constituent Maximum Numeric Constituent Units Numeric Constituent Comments Numeric Constituent Reference WARM dissolved Dxygen --5 mg/L AGR 3oron -0.75 mg/L Quality Criteria for Water, 1986-Gold Book. Water Quality Ammonia Criteria Beneficial Use Constituent Name Constituent pH Constituent Tempei-ature Constituent Time Duration Constituent Concentration Constituent Units A(iR Ammonia as N --0.025 mg/L RECl Ammonia as N --0.025 mg/L REC2 Ammonia as N --0.025 mg/L WARM Ammonia as N --0.025 mg/L WILD Ammonia asN --0.025 mg/L Wai ter Quality Bacteria Criteria Beneficial Use Constituent Name Constituent Concentration Details Constituent Concentration Constituent Units Constituent Comments Constituent Reference RECl Fecal Coliform Log Mean-10% of Samples for 30 day 400 Count per 100 ml Log mean value. Based on more than 10 percent of total samples during any 30-day period. RECl Fecal Coliform Log Mean-5 Samples for 30 day 200 Count per 100 ml Log mean value. Based on a minimum of not less than five samples for any 30-day period. Fecal Coliform Average-10% of Samples for 30 day 4000 Count per 100 ml Average value. Based on more than 10 percent of total samples during any 30-day period. REC2 Fecal Coliform Average-for 30 day 2000 Count per 100 ml Average value. Based on samples for a 30-day period. Comments Comments Click above to go to the Comments input page. Hi, I'm having problems linking to San Marcos creek from the Geospatial Waterbody System Assessment Data for 303(d) determination. Please let me know where or when I could get this information. Thanks, Louie © Information Center for the Environment ' mfo(^.ice.ucdavis.edu \ Search | Notices | http .//endeavor, des.ucdavi s. edu/wq sid/waterbody. asp?wb fkey=3709 1/16/04