| #D001 | | Application Area | Is the area of the treated waterbody to which lanthanum-modified clay is directly applied. | high |
| #D002 | | Arithmetic Mean ( μ ) | Also called the average, is the sum of measured values divided by the number of samples. For ambient water concentrations, the arithmetic mean is calculated as follows: where: Σ x is the sum of the measured ambient water concentrations, and n is the number of samples. | high |
| #D003 | | Average Monthly Effluent Limitation (AMEL) | The highest allowable average of daily discharges over a calendar month, calculated as the sum of all daily discharges measured during a calendar month divided by the number of daily discharges measured during that month. | high |
| #D004 | | Average Weekly Effluent Limitation (AWEL) | The highest allowable average of daily discharges over a calendar week (Sunday through Saturday), calculated as the sum of all daily discharges measured during a calendar week divided by the number of daily discharges measured during that week. | high |
| #D005 | | Bioaccumulative | Those substances taken up by an organism from its surrounding medium through gill membranes, epithelial tissue, or from food and subsequently concentrated and retained in the body of the organism. | high |
| #D006 | | Carcinogenic | Pollutants are substances that are known to cause cancer in living organisms. | high |
| #D007 | | Coefficient of Variation (CV) | CV is a measure of the data variability and is calculated as the estimated standard deviation divided by the arithmetic mean of the observed values. | high |
| #D008 | | Daily Discharge | Daily Discharge is defined as either: (1) the total mass of the constituent discharged over the calendar day (12:00 am through 11:59 pm) or any 24-hour period that reasonably represents a calendar day for purposes of sampling (as specified in the permit), for a constituent with limitations expressed in units of mass or; (2) the unweighted arithmetic mean measurement of the constituent over the day for a constituent with limitations expressed in other units of measurement (e.g., concentration). The daily discharge may be determined by the analytical results of a composite sample taken over the course of one day (a calendar day or other 24-hour period defined as a day) or by the arithmetic mean of analytical results from one or more grab samples taken over the course of the day. For composite sampling, if 1 day is defined as a 24-hour period other than a calendar day, the analytical result for the 24-hour period will be considered as the result for the calendar day in which the 24-hour period ends. | high |
| #D009 | | Detected, but Not Quantified (DNQ) | DNQ are those sample results less than the reporting limit (RL), but greater than or equal to the laboratory's method detection limit (MDL). Sample results reported as DNQ are estimated concentrations. | high |
| #D010 | | Effluent Concentration Allowance (ECA) | ECA is a value derived from the water quality criterion/objective, dilution credit, and ambient background concentration that is used, in conjunction with the coefficient of variation for the effluent monitoring data, to calculate a long-term average (LTA) discharge concentration. The ECA has the same meaning as wasteload allocation (WLA) as used in U.S. EPA guidance ( Technical Support Document for Water Qualitybased Toxics Control , March 1991, second printing, EPA/505/2-90-001). | high |
| #D011 | | Enclosed Bays | Enclosed Bays means indentations along the coast that enclose an area of oceanic water within distinct headlands or harbor works. Enclosed bays include all bays where the narrowest distance between the headlands or outermost harbor works is less than 75 percent of the greatest dimension of the enclosed portion of the bay. Enclosed bays include, but are not limited to, Humboldt Bay, Bodega Harbor, Tomales Bay, Drake's Estero, San Francisco Bay, Morro Bay, Los Angeles-Long Beach Harbor, Upper and Lower Newport Bay, Mission Bay, and San Diego Bay. Enclosed bays do not include inland surface waters or ocean waters. | high |
| #D012 | | Estimated Chemical Concentration | The estimated chemical concentration that results from the confirmed detection of the substance by the analytical method below the minimum level (ML) value. | high |
| #D013 | | Estuaries | Estuaries means waters, including coastal lagoons, located at the mouths of streams that serve as areas of mixing for fresh and ocean waters. Coastal lagoons and mouths of streams that are temporarily separated from the ocean by sandbars shall be considered estuaries. Estuarine waters shall be considered to extend from a bay or the open ocean to a point upstream where there is no significant mixing of fresh water and seawater. Estuarine waters included, but are not limited to, the Sacramento-San Joaquin Delta, as defined in Water Code section 12220, Suisun Bay, Carquinez Strait downstream to the Carquinez Bridge, and appropriate areas of the Smith, Mad, Eel, Noyo, Russian, Klamath, San Diego, and Otay rivers. Estuaries do not include inland surface waters or ocean waters. | high |
| #D014 | | Inland Surface Waters | All surface waters of the State of California (State) that do not include the ocean, enclosed bays, or estuaries. | high |
| #D015 | | Instantaneous Maximum Effluent Limitation | The highest allowable value for any single grab sample or aliquot (i.e., each grab sample or aliquot is independently compared to the instantaneous maximum limitation). | high |
| #D016 | | Instantaneous Minimum Effluent Limitation | The lowest allowable value for any single grab sample or aliquot (i.e., each grab sample or aliquot is independently compared to the instantaneous minimum limitation). | high |
| #D017 | | Maximum Daily Effluent Limitation (MDEL) | The highest allowable daily discharge of a pollutant, over a calendar day (or 24-hour period). For pollutants with limitations expressed in units of mass, the daily discharge is calculated as the total mass of the pollutant discharged over the day. For pollutants with limitations expressed in other units of measurement, the daily discharge is calculated as the arithmetic mean measurement of the pollutant over the day. | high |
| #D018 | | Method Detection Limit (MDL) | MDL is the minimum concentration of a substance that can be reported with 99 percent confidence that the measured concentration is distinguishable from method blank results, as defined in 40 Code of Federal Regulations (CFR). part 136, Attachment B. | high |
| #D019 | | Minimum Level (ML) | ML is the concentration at which the entire analytical system must give a recognizable signal and acceptable calibration point. The ML is the concentration in a sample that is equivalent to the concentration of the lowest calibration standard analyzed by a specific analytical procedure, assuming that all the method specified sample weights, volumes, and processing steps have been followed. | high |
| #D020 | | Mixing Zone | Mixing Zone is a limited volume of receiving water that is allocated for mixing with a wastewater discharge where water quality criteria can be exceeded without causing adverse effects to the overall waterbody. | high |
| #D021 | | Not Detected (ND) | Sample results which are less than the laboratory's MDL. | high |
| #D022 | | Persistent Pollutants | Persistent pollutants are substances for which degradation or decomposition in the environment is nonexistent or very slow. | high |
| #D023 | | Pollutant Minimization Program (PMP) | PMP means waste minimization and pollution prevention actions that include, but are not limited to, product substitution, waste stream recycling, alternative waste management methods, and education of the public and businesses. The goal of the PMP shall be to reduce all potential sources of a priority pollutant(s) through pollutant minimization (control) strategies, including pollution prevention measures as appropriate, to maintain the effluent concentration at or below the water quality-based effluent limitation. Pollution prevention measures may be particularly appropriate for persistent bioaccumulative priority pollutants where there is evidence that beneficial uses are being impacted. The San Diego Water Board may consider cost effectiveness when establishing the requirements of a PMP. The completion and implementation of a Pollution Prevention Plan, if required pursuant to Water Code section 13263.3(d), shall be considered to fulfill the PMP requirements. | high |
| #D024 | | Pollution Prevention | Pollution Prevention means any action that causes a net reduction in the use or generation of a hazardous substance or other pollutant that is discharged into water and includes, but is not limited to, input change, operational improvement, production process change, and product reformulation (as defined in Water Code section 13263.3). Pollution prevention does not include actions that merely shift a pollutant in wastewater from one environmental medium to another environmental medium, unless clear environmental benefits of such an approach are identified to the satisfaction of the California State Water Resources Control Board (State Water Board) or San Diego Water Board. | high |
| #D025 | | Reporting Level (RL) | The RL is the ML (and its associated analytical method) chosen by the Discharger for reporting and compliance determination from the MLs included in this Order, including an additional factor if applicable as discussed herein. The MLs included in this Order correspond to approved analytical methods for reporting a sample result that are selected by the San Diego Water Board either from Appendix 4 of the SIP in accordance with section 2.4.2 of the SIP or established in accordance with section 2.4.3 of the SIP. The ML is based on the proper application of method-based analytical procedures for sample preparation and the absence of any matrix interferences. Other factors may be applied to the ML depending on the specific sample preparation steps employed. For example, the treatment typically applied in cases where there are matrixeffects is to dilute the sample or sample aliquot by a factor of ten. In such cases, this additional factor must be applied to the ML in the computation of the RL. | high |
| #D026 | | Source of Drinking Water | Any water designated as municipal or domestic supply (MUN) in the San Diego Basin Plan. | high |
| #D027 | | Statistical Threshold Value (STV) | The STV for the bacteria water quality objectives is a set value that approximates the 90th percentile of the water quality distribution of a bacterial population. For the bacteria water quality objectives, the STV for E-coli is 320 CFU/100 mL. | high |
| #D028 | | Toxicity Reduction Evaluation (TRE) | TRE is a study conducted in a step-wise process designed to identify the causative agents of effluent or ambient toxicity, isolate the sources of toxicity, evaluate the effectiveness of toxicity control options, and then confirm the reduction in toxicity. The first steps of the TRE consist of the collection of data relevant to the toxicity, including additional toxicity testing, and an evaluation of facility operations and maintenance practices, and best management practices. A Toxicity Identification Evaluation (TIE) may be required as part of the TRE, if appropriate. (A TIE is a set of procedures to identify the specific chemical(s) responsible for toxicity. These procedures are performed in three phases (characterization, identification, and confirmation) using aquatic organism toxicity tests.) | high |
| #D029 | | Discharger | Any person or entity that discharges lanthanum-modified clay to canals, ditches, lakes, ponds, reservoirs or other storage or constructed conveyance facilities that are surface waters of the United States (U.S.) for the purpose of inactivating soluble reactive phosphorus. | high |
| #D030 | | Median | The middle measurement in a set of data. The median of a set of data is found by first arranging the measurements in order of magnitude (either increasing or decreasing order) If the number of measurements (n) is odd, then: If n is even, then: (i.e., the midpoint between the (n/2 and ((n/2)+1))). | high |
| #D031 | | Standard Deviation ( σ ) | Standard Deviation is a measure of variability that is calculated as follows: where: x is the observed value; µ is the arithmetic mean of the observed values; and n is the number of samples. | high |
| #D032 | | Bypass | ‘Bypass’ means the intentional diversion of waste streams from any portion of a treatment facility. (40 CFR § 122.41(m)(1)(i).) | high |
| #D033 | | Severe property damage | ‘Severe property damage’ means substantial physical damage to property, damage to the treatment facilities, which causes them to become inoperable, or substantial and permanent loss of natural resources that can reasonably be expected to occur in the absence of a bypass. Severe property damage does not mean economic loss caused by delays in production. (40 CFR § 122.41(m)(1)(ii).) | high |
| #D034 | | Upset | Upset means an exceptional incident in which there is unintentional and temporary noncompliance with technology-based permit effluent limitations because of factors beyond the reasonable control of the Discharger. An upset does not include noncompliance to the extent caused by operational error, improperly designed treatment facilities, inadequate treatment facilities, lack of preventive maintenance, or careless or improper operation. (40 CFR § 122.41(n)(1).) | high |
| #D035 | | Order | For the purposes of this Order, the term permit, general permit, and WDR, shall have the same meaning as the term Order used elsewhere in this Order. | high |
| #D036 | | Toxicity Identification Evaluation (TIE) | A TIE is a set of procedures to identify the specific chemical(s) responsible for toxicity. These procedures are performed in three phases (characterization, identification, and confirmation) using aquatic organism toxicity tests. | high |
| #D037 | | Storm water | storm water runoff, snow melt runoff, and surface runoff and drainage. | high |
| #D038 | | Illicit discharge | any discharge to a storm water conveyance system that is not composed entirely of storm water except discharges pursuant to an NPDES permit and discharges resulting from firefighting activities. | high |
| #D039 | | Category 3 | Those discharges of waste that could degrade water quality without violating water quality objectives or could cause a minor impairment of designated beneficial uses as compared with Category 1 and Category 2. | high |
| #D040 | | Category C | Any discharger for which waste discharge requirements have been prescribed pursuant to Section 13263 of the Water code not included in Category A [toxics] or Category B [non-toxic but requiring treatment]. Included are dischargers having no waste treatment systems or that must comply with best management practices, dischargers having passive treatment and disposal systems, or dischargers having waste storage systems with land disposal. | high |
| #D041 | | existing Dischargers | Dischargers enrolled under Order No. R9-2012-0063. | high |
| #D042 | | Hardness | Hardness is a measure of divalent cations in the water. In most cases, hardness is predominately a measure of the dissolved calcium (Ca 2+ ) and dissolved magnesium (Mg 2+ ) present. | high |
| #D043 | | Water Effect Ratio (WER) | A WER represents the correlation between the concentration that is present (measured in water sample) and the concentration that is biologically available and toxic to aquatic life. | high |
| #D044 | | Biologically available | 'Biologically available' refers to the metal being present in its free ionic state as a dissolved metal and able to take part in the biological processes of the aquatic life. | high |
| #D045 | | Wet weather | It is commonly defined as a storm event with greater than 0.1 inch of rainfall. | high |
| #D046 | | California Toxics Rule (CTR) | The USEPA promulgated a final rule prescribing water quality criteria for toxic pollutants in inland surface waters, enclosed bays, and estuaries in California on May 18, 2000 (The California Toxics Rule or 'CTR;' [40 CFR 131.38]). | high |
| #D047 | | CMC | criteria maximum concentration | high |
| #D048 | | CCC | criteria continuous concentration | high |
| #D049 | | TMDLs | Total Maximum Daily Loads | high |
| #D050 | | WLAs | wasteload allocations | high |
| #D051 | | San Diego Water Board | California Regional Water Quality Control Board, San Diego Region | high |
| #D052 | | Basin Plan | Water Quality Control Plan for the San Diego Basin | high |
| #D053 | | State Water Board | State Water Resource Control Board | high |
| #D054 | | USEPA | United States Environmental Protection Agency | high |
| #D055 | | CFR | Code of Federal Regulations | high |
| #D056 | | Chollas Creek Metals TMDLs | Total Maximum Daily Loads for Copper, Lead, and Zinc in Chollas Creek, tributary to San Diego Bay | high |
| #D057 | | OAL | State Office of Administrative Law | high |
| #D058 | | Technical Report | Technical Report for Tentative Resolution No. R9-2017-0015, Resolution Amending the Water Quality Control Plan for the San Diego Basin to Incorporate Site-Specific Water Effect Ratios into the Total Maximum Daily Loads for Copper, Lead, and Zinc in Chollas Creek | high |
| #D059 | | CEQA | California Environmental Quality Act | high |
| #D060 | | PRC | Public Resources Code | high |
| #D061 | | 14 CCR | California Code of Regulations, Title 14 | high |
| #D062 | | TMDL (Loading Capacity) | The maximum amount of a pollutant that a waterbody can receive and still attain water quality objectives and protection of designated beneficial uses. | high |
| #D063 | | enforcement action | Any formal or informal action taken to address an incidence of actual or threatened noncompliance with existing regulations or provisions designed to protect water quality. | high |
| #D064 | | Onsite wastewater treatment system(s) (OWTS) | Any individual or community onsite wastewater treatment, pretreatment and dispersal system including, but not limited to, a conventional, alternative, or experimental sewage dispersal system such a septic tanks having a subsurface discharge. | high |
| #D065 | | Pollution Prevention | Practices and processes that reduce or eliminate the generation of pollutants, in contrast to source control, treatment, or disposal. | high |
| #D066 | | Wet weather days | Days with rainfall events of 0.2 inches or greater and the following 72 hours. | high |
| #D067 | | Dry weather days | Days with less than 0.2 inch of rainfall observed on each of the previous 3 days. | high |
| #D068 | | Designated Beach Area | Those recreation waters that, during the recreation season, are heavily used (based upon a comparison of use within the state) and may have a lifeguard, bathhouse facilities, or public parking for beach access. | high |
| #D069 | | Moderate Full Body Contact Recreation | Those recreation waters that are not designated bathing beach waters but typically, during the recreation season, are used by at least half of the number of people as at typical designated bathing beach waters within the state. | high |
| #D070 | | Lightly Used Full Body Contact Recreation | Those recreation waters that are not designated bathing beach waters but typically, during the recreation season, are used by less than half of the number of people as at typical designated bathing beach waters within the state, but are more than infrequently used. | high |
| #D071 | | Infrequently Used Full Body Contact | Those recreation waters that are rarely or occasionally used. | high |
| #D072 | | Adaptive management | A structured iterative implementation process that offers flexibility for responsible parties to monitor implementation actions, determine the success of such actions and ultimately, base future management decisions upon the measured results of completed implementation actions and the current state of the system. | high |
| #D073 | | RWQCB | Regional Water Quality Control Board, San Diego Region | high |
| #D074 | | SWRCB | State Water Resources Control Board | high |
| #D075 | | OAL | Office of Administrative Law | high |
| #D076 | | USEPA | United State Environmental Protection Agency | high |
| #D077 | | TIEs | Toxicity Identification Evaluations | high |
| #D078 | | MS4 Permit | San Diego Municipal Storm Water Permit (Regional Board Order No. 2001-01 NPDES No. CAS0108758) | high |
| #D079 | | CTR | California Toxics Rule | high |
| #D080 | | AMAL | Average Monthly Action Level | high |
| #D081 | | ASBS | Area(s) of Special Biological Significance | high |
| #D082 | | BMP | Best Management Practice | high |
| #D083 | | Basin Plan | Water Quality Control Plan for the San Diego Basin | high |
| #D084 | | CEQA | California Environmental Quality Act | high |
| #D085 | | CCR | California Code of Regulations | high |
| #D086 | | CFR | Code of Federal Regulations | high |
| #D087 | | CWA | Clean Water Act | high |
| #D088 | | CWC | California Water Code | high |
| #D089 | | CZARA | Coastal Zone Act Reauthorization Amendments of 1990 | high |
| #D090 | | ESAs | Environmentally Sensitive Areas | high |
| #D091 | | GIS | Geographic Information System | high |
| #D092 | | IBI | Index of Biological Integrity | high |
| #D093 | | LID | Low Impact Development | high |
| #D094 | | MDAL | Maximum Daily Action Level | high |
| #D095 | | MEP | Maximum Extent Practicable | high |
| #D096 | | MS4 | Municipal Separate Storm Sewer System | high |
| #D097 | | NAL | Non-Storm Water Action Level | high |
| #D098 | | NAICS | North American Industry Classification System | high |
| #D099 | | NOI | Notice of Intent | high |
| #D100 | | NPDES | National Pollutant Discharge Elimination System | high |
| #D101 | | ROWD | Report of Waste Discharge (application for NPDES reissuance) | high |
| #D102 | | SAL | Storm Water Action Level | high |
| #D103 | | San Diego Water Board | California Regional Water Quality Control Board, San Diego Region | high |
| #D104 | | SIC | Standard Industrial Classification Code | high |
| #D105 | | State Water Board | State Water Resources Control Board | high |
| #D106 | | TMDL | Total Maximum Daily Load | high |
| #D107 | | USEPA | United States Environmental Protection Agency | high |
| #D108 | | WDID | Waste Discharge Identification Number | high |
| #D109 | | WLA | Waste Load Allocation | high |
| #D110 | | WQBEL | Water Quality Based Effluent Limitation | high |
| #D111 | | Active/Passive Sediment Treatment | Using mechanical, electrical or chemical means to flocculate or coagulate suspended sediment for removal from runoff from construction sites prior to discharge. | high |
| #D112 | | Anthropogenic Litter | Trash generated from human activities, not including sediment. | high |
| #D113 | | Average Monthly Action Level | The highest allowable average of daily discharges over a calendar month. | high |
| #D114 | | Beneficial Uses | The uses of water necessary for the survival or wellbeing of man, plants, and wildlife. These uses of water serve to promote tangible and intangible economic, social, and environmental goals. 'Beneficial Uses' of the waters of the State that may be protected include, but are not limited to, domestic, municipal, agricultural and industrial supply; power generation; recreation; aesthetic enjoyment; navigation; and preservation and enhancement of fish, wildlife, and other aquatic resources or preserves. Existing beneficial uses are uses that were attained in the surface or ground water on or after November 28, 1975; and potential beneficial uses are uses that would probably develop in future years through the implementation of various control measures. 'Beneficial Uses' are equivalent to 'Designated Uses' under federal law. [California Water Code Section 13050(f)]. | high |
| #D115 | | Best Management Practices (BMPs) | Defined in 40 CFR 122.2 as schedules of activities, prohibitions of practices, maintenance procedures, and other management practices to prevent or reduce the pollution of waters of the United States. BMPs also include treatment requirements, operating procedures and practices to control plant site runoff, spillage or leaks, sludge or waste disposal, or drainage from raw material storage. | high |
| #D116 | | Bioassessment | The use of biological community information to evaluate the biological integrity of a water body and its watershed. With respect to aquatic ecosystems, bioassessment is the collection and analysis of samples of the benthic macroinvertebrate community together with physical/habitat quality measurements associated with the sampling site and the watershed to evaluate the biological condition (i.e. biotic integrity) of a water body. | high |
| #D117 | | Biofiltration | Practices that use vegetation and amended soils to detain and treat runoff from impervious areas. Treatment is through filtration, infiltration, adsorption, ion exchange, and biological uptake of pollutants. | high |
| #D118 | | Biological Integrity | Defined in Karr J.R. and D.R. Dudley. 1981. Ecological perspective on water quality goals. Environmental Management 5:55-68 as: 'A balanced, integrated, adaptive community of organisms having a species composition, diversity, and functional organization comparable to that of natural habitat of the region.' Also referred to as ecosystem health. | high |
| #D119 | | BMP Design Manual | A plan developed to eliminate, reduce, or mitigate the impacts of runoff from development projects, including Priority Development Projects. | high |
| #D120 | | Chronic Toxicity | A measurement of sublethal effect (e.g. reduced growth, reproduction) to experimental test organisms exposed to an effluent or receiving waters compared to that of the control organisms. | high |
| #D121 | | Clean Water Act Section 303(d) Water Body | An impaired water body in which water quality does not meet applicable water quality standards and/or is not expected to meet water quality standards, even after the application of technology based pollution controls required by the CWA. The discharge of runoff to these water bodies by the Copermittees is significant because these discharges can cause or contribute to violations of applicable water quality standards. | high |
| #D122 | | Construction Activities | Actions implemented during construction of development or redevelopment projects during the Preliminary Task (including rough grading and/or disking, clearing and grubbing operations, or any soil disturbance prior to mass grading), Grading or Land Development (including topography and slope reconfiguration, alluvium removals, canyon cleanouts, rock undercuts, keyway excavations, land form grading, and stockpiling of select material for capping operations), Streets and Utility Installation (including excavation and street paving, lot grading, curbs, gutters and sidewalks, public utilities, public water facilities including fire hydrants, public sanitary sewer systems, storm sewer systems and/or other drainage improvements), or Vertical Construction (including the build out of structures from foundations to roofing, including rough landscaping). | high |
| #D123 | | Construction Site | Any project, including projects requiring coverage under the Construction General Permit, that involves soil disturbing activities including, but not limited to, clearing, grading, disturbances to ground such as stockpiling, and excavation. | high |
| #D124 | | Contamination | As defined in the Porter-Cologne Water Quality Control Act, contamination is 'an impairment of the quality of waters of the State by waste to a degree which creates a hazard to the public health through poisoning or through the spread of disease. 'Contamination' includes any equivalent effect resulting from the disposal of waste whether or not waters of the State are affected.' | high |
| #D125 | | Copermittee | A permittee to a NPDES permit that is only responsible for permit conditions relating to the discharge for which it is operator [40 CFR 122.26(b)(1)]. For the purposes of this Order, a Copermittee is one of the individual permittees identified in Tables 1a-1c of this Order. | high |
| #D126 | | Copermittees | All of the individual Copermittees, collectively. | high |
| #D127 | | Critical Channel Flow (Qc) | The channel flow that produces the critical shear stress that initiates bed movement or that erodes the toe of channel banks. When measuring Qc, it should be based on the weakest boundary material - either bed or bank. | high |
| #D128 | | Daily Discharge | Defined as either: (1) the total mass of the constituent discharged over the calendar day or any 24 hour period that reasonably represents a calendar day for purposes of sampling (as specified in the permit), for a constituent with limitations expressed in units of mass or; (2) the unweighted arithmetic mean measurement of the constituent over the day for a constituent with limitations expressed in other units of measurement (e.g. concentration.) The Daily Discharge may be determined by the analytical results of a composite sample taken over the course of one day (a calendar day, or other 24 hour period other than a day), or by the arithmetic mean of analytical results from one or more grab samples taken over the course of a day. | high |
| #D129 | | Development Projects | Construction, rehabilitation, redevelopment, or reconstruction of any public or private projects. | high |
| #D130 | | Dry Season | May 1 to September 30. | high |
| #D131 | | Dry Weather | Weather is considered dry if the preceding 72 hours has been without measurable precipitation (>0.1 inch). | high |
| #D132 | | Enclosed Bays | Enclosed bays are indentations along the coast that enclose an area of oceanic water within distinct headlands or harbor works. Enclosed bays include all bays where the narrowest distance between the headlands or outermost harbor works is less than 75 percent of the greatest dimension of the enclosed portion of the bay. Enclosed bays do not include inland surface waters or ocean waters. | high |
| #D133 | | Erosion | When land is diminished or worn away due to wind, water, or glacial ice. Often the eroded debris (silt or sediment) becomes a pollutant via storm water runoff. Erosion occurs naturally but can be intensified by land clearing activities such as farming, development, road building, and timber harvesting. | high |
| #D134 | | Environmentally Sensitive Areas (ESAs) | Areas that include but are not limited to all Clean Water Act Section 303(d) impaired water bodies; areas designated as Areas of Special Biological Significance by the State Water Board and San Diego Water Board; State Water Quality Protected Areas; water bodies designated with the RARE beneficial use by the State Water Board and San Diego Water Board; areas designated as preserves or their equivalent under the Natural Communities Conservation Program within the Cities and County of Orange; and any other equivalent environmentally sensitive areas which have been identified by the Copermittees. | high |
| #D135 | | Estuaries | Waters, including coastal lagoons, located at the mouth of streams that serve as areas of mixing fresh and ocean waters. Coastal lagoons and mouths of streams that are temporarily separated from the ocean by sandbars shall be considered estuaries. Estuarine waters shall be considered to extend from a bay or the open ocean to a point upstream where there is no significant mixing of fresh water and ocean water. Estuaries do not include inland surface waters or ocean waters. | high |
| #D136 | | Existing Development | Any area that has been developed and exists for municipal, commercial, industrial, or residential purposes, uses, or activities. May include areas that are not actively used for its originally developed purpose, but may be re-purposed or redeveloped for another use or activity. | high |
| #D137 | | Flow Duration | The long-term period of time that flows occur above a threshold that causes significant sediment transport and may cause excessive erosion damage to creeks and streams (not a single storm event duration). The simplest way to visualize this is to consider a histogram of pre- and post-project flows using long-term records of hourly data. To maintain predevelopment flow duration means that the total number of hours (counts) within each range of flows in a flow-duration histogram cannot increase between the pre- and post-development condition. Flow duration within the range of geomorphologically significant flows is important for managing erosion. | high |
| #D138 | | Grading | The cutting and/or filling of the land surface to a desired slope or elevation. | high |
| #D139 | | Groundwater | Subsurface water that occurs beneath the water table in soils and geologic formations that are fully saturated. | high |
| #D140 | | Hazardous Material | Any substance that poses a threat to human health or the environment due to its toxicity, corrosiveness, ignitability, explosive nature or chemical reactivity. These also include materials named by the USEPA in 40 CFR 116 to be reported if a designated quantity of the material is spilled into the waters of the U.S. or emitted into the environment. | high |
| #D141 | | Hazardous Waste | Hazardous waste is defined as 'any waste which, under Section 600 of Title 22 of this code, is required to be managed according to Chapter 30 of Division 4.5 of Title 22 of this code' [CCR Title 22, Division 4.5, Chapter 11, Article 1]. | high |
| #D142 | | Household Hazardous Waste | Paints, cleaning products, and other hazardous wastes generated during home improvement or maintenance activities. | high |
| #D143 | | Hydromodification | The change in the natural watershed hydrologic processes and runoff characteristics (i.e., interception, infiltration, overland flow, and groundwater flow) caused by urbanization or other land use changes that result in increased stream flows and sediment transport. In addition, alteration of stream and river channels, such as stream channelization, concrete lining, installation of dams and water impoundments, and excessive streambank and shoreline erosion are also considered hydromodification, due to their disruption of natural watershed hydrologic processes. | high |
| #D144 | | Illicit Connection | Any man-made conveyance or drainage system through which a non-storm water discharge to the storm water drainage system occurs or may occur. Any connection to the MS4 that conveys an illicit discharge. | high |
| #D145 | | Illicit Discharge | Any discharge to the MS4 that is not composed entirely of storm water except discharges pursuant to a NPDES permit and discharges resulting from firefighting activities [40 CFR 122.26(b)(2)]. | high |
| #D146 | | Inactive Areas | Areas of construction activity that are not active and those that have been active and are not scheduled to be re-disturbed for at least 14 days. | high |
| #D147 | | Infiltration | In the context of low impact development, infiltration is defined as the percolation of water into the ground. Infiltration is often expressed as a rate (inches per hour), which is determined through an infiltration test. In the context of non-storm water, infiltration is water other than wastewater that enters a sewer system (including sewer service connections and foundation drains) from the ground through such means as defective pipes, pipe joints, connections, or manholes. Infiltration does not include, and is distinguished from, inflow [40 CFR 35.2005(20)]. | high |
| #D148 | | Inland Surface Waters | Includes all surface waters of the State that do not include the ocean, enclosed bays, or estuaries. | high |
| #D149 | | Jurisdictional Runoff Management Program Document | A written description of the specific jurisdictional runoff management measures and programs that each Copermittee will implement to comply with this Order and ensure that storm water pollutant discharges in runoff are reduced to the MEP and do not cause or contribute to a violation of water quality standards. | high |
| #D150 | | Low Impact Development (LID) | A storm water management and land development strategy that emphasizes conservation and the use of on-site natural features integrated with engineered, small-scale hydrologic controls to more closely reflect pre-development hydrologic functions. | high |
| #D151 | | Low Impact Development Best Management Practices (LID BMPs) | LID BMPs include schedules of activities, prohibitions of practices, maintenance procedures, and other management practices to prevent or reduce the pollution of waters of the United States through storm water management and land development strategies that emphasize conservation and the use of on-site natural features integrated with engineered, small-scale hydrologic controls to more closely reflect pre-development hydrologic functions. LID BMPs include retention practices that do not allow runoff, such as infiltration, rain water harvesting and reuse, and evapotranspiration. LID BMPs also include flow-through practices such as biofiltration that may have some discharge of storm water following pollutant reduction. | high |
| #D152 | | Major Outfall | As defined in the Code of Federal Regulations, a major outfall is a MS4 outfall that discharges from a single pipe with an inside diameter of 36 inches or more or its equivalent (i.e. discharge from a single conveyance other than a circular pipe which is associated with a drainage area of more than 50 acres); or, for MS4s that receive storm water from lands zoned for industrial activity (based on comprehensive zoning plans or equivalent), a MS4 outfall that discharges from a single pipe with an inside diameter of 12 inches or more or from its equivalent (i.e. discharge from other than a circular pipe associated with a drainage area of 2 acres or more). | high |
| #D153 | | Maximum Daily Action Level (MDAL) | The highest allowable daily discharge of a pollutant, over a calendar day (or 24 hour period). For pollutants with action levels expressed in units of mass, the daily discharge is calculated as the total mass of the pollutant discharged over the day. For pollutants with action levels expressed in other units of measurement, the daily discharge is calculated as the arithmetic mean measurement of the pollutant over the day. | high |
| #D154 | | Maximum Extent Practicable (MEP) | The technology-based standard established by Congress in CWA section 402(p)(3)(B)(iii) for storm water that operators of MS4s must meet. Technology-based standards establish the level of pollutant reductions that dischargers must achieve, typically by treatment or by a combination of source control and treatment control BMPs. MEP generally emphasizes pollution prevention and source control BMPs primarily (as the first line of defense) in combination with treatment methods serving as a backup (additional line of defense). MEP considers economics and is generally, but not necessarily, less stringent than BAT. A definition for MEP is not provided either in the statute or in the regulations. Instead the definition of MEP is dynamic and will be defined by the following process over time: municipalities propose their definition of MEP by way of their runoff management programs. Their total collective and individual activities conducted pursuant to the runoff management programs becomes their proposal for MEP as it applies both to their overall effort, as well as to specific activities (e.g., MEP for street sweeping, or MEP for MS4 maintenance). In the absence of a proposal acceptable to the San Diego Water Board, the San Diego Water Board defines MEP. | high |
| #D155 | | Monitoring Year | October 1 to September 30 | high |
| #D156 | | Municipal Separate Storm Sewer System (MS4) | A conveyance or system of conveyances (including roads with drainage systems, municipal streets, catch basins, curbs, gutters, ditches, man-made channels, or storm drains): (i) Owned or operated by a State, city, town, borough, county, parish, district, association, or other public body (created by or pursuant to State law) having jurisdiction over disposal of sewage, industrial wastes, storm water, or other wastes, including special districts under State law such as a sewer district, flood control district or drainage district, or similar entity, or an Indian tribe or an authorized Indian tribal organization, or designated and approved management agency under section 208 of the CWA that discharges to waters of the United States; (ii) Designated or used for collecting or conveying storm water; (iii) Which is not a combined sewer; (iv) Which is not part of the Publicly Owned Treatment Works (POTW) as defined at 40 CFR 122.26. | high |
| #D157 | | National Pollutant Discharge Elimination System (NPDES) | The national program for issuing, modifying, revoking and reissuing, terminating, monitoring and enforcing permits, and imposing and enforcing pretreatment requirements, under Sections 307, 318, 402, and 405 of the CWA. | high |
| #D158 | | Non-Storm Water | All discharges to and from a MS4 that do not originate from precipitation events (i.e., all discharges from a MS4 other than storm water). Non-storm water includes illicit discharges and NPDES permitted discharges. | high |
| #D159 | | Nuisance | As defined in the Porter-Cologne Water Quality Control Act, a nuisance is 'anything which meets all of the following requirements: 1) Is injurious to health, or is indecent, or offensive to the senses, or an obstruction to the free use of property, so as to interfere with the comfortable enjoyment of life or property. 2) Affects at the same time an entire community or neighborhood, or any considerable number of persons, although the extent of the annoyance or damage inflicted upon individuals may be unequal. 3) Occurs during, or as a result of, the treatment or disposal of wastes.' | high |
| #D160 | | Ocean Waters | The territorial marine waters of the State as defined by California law to the extent these waters are outside of enclosed bays, estuaries, and coastal lagoons. Discharges to ocean waters are regulated in accordance with the State Board's California Ocean Plan. | high |
| #D161 | | Order | Unless otherwise specified, refers to this Order, Order No. R9-2013-0001 (NPDES No. CAS0109266) | high |
| #D162 | | Outfall | Outfall means a point source as defined by 40 CFR 122.2 at the point where a municipal separate storm sewer discharges to waters of the US and does not include open conveyances connecting two municipal separate storm sewers, or pipes, tunnels or other conveyances which connect segments of the same stream or other waters of the US and are used to convey waters of the US. | high |
| #D163 | | Persistent Flow | Persistent flow is defined as the presence of flowing, pooled, or ponded water more than 72 hours after a measureable rainfall event of 0.1 inch or greater during three consecutive monitoring and/or inspection events. All other flowing, pooled, or ponded water is considered transient. | high |
| #D164 | | Person | A person is defined as an individual, association, partnership, corporation, municipality, State or Federal agency, or an agent or employee thereof [40 CFR 122.2]. | high |
| #D165 | | Point Source | Any discernible, confined, and discrete conveyance, including, but not limited to, any pipe, ditch, channel, tunnel, conduit, well, discrete fissure, container, rolling stock, concentrated animal feeding operations, landfill leachate collection systems, vessel, or other floating craft from which pollutants are or may be discharged. This term does not include return flows from irrigated agriculture or agricultural storm water runoff. | high |
| #D166 | | Pollutant | Any agent that may cause or contribute to the degradation of water quality such that a condition of pollution or contamination is created or aggravated. | high |
| #D167 | | Pollution | As defined in the Porter-Cologne Water Quality Control Act, pollution is 'the alteration of the quality of the waters of the State by waste, to a degree which unreasonably affects either of the following: 1) The waters for beneficial uses; or 2) Facilities that serve these beneficial uses.' Pollution may include contamination. | high |
| #D168 | | Pollution Prevention | Pollution prevention is defined as practices and processes that reduce or eliminate the generation of pollutants, in contrast to source control BMPs, treatment control BMPs, or disposal. | high |
| #D169 | | Pre-Development Runoff Conditions | Approximate flow rates and durations that exist or existed onsite before land development occurs. For new development projects, this equates to runoff conditions immediately before project construction. For redevelopment projects, this equates to runoff conditions from the project footprint assuming infiltration characteristics of the underlying soil, and existing grade. Runoff coefficients of concrete or asphalt must not be used. A redevelopment Priority Development Project must use available information pertaining to existing underlying soil type and onsite existing grade to estimate pre-development runoff conditions. | high |
| #D170 | | Priority Development Projects | New development and redevelopment projects defined under Provision E.3.b of Order No. R9-2013-0001, as amended by Order Nos. R9-2015-0001 and R9-2015-0100. | high |
| #D171 | | Rainy Season (aka Wet Season) | October 1 to April 30 | high |
| #D172 | | Receiving Waters | Waters of the United States. | high |
| #D173 | | Receiving Water Limitations | Waste discharge requirements issued by the San Diego Water Board typically include both: (1) 'Effluent Limitations' (or 'Discharge Limitations') that specify the technology-based or water-quality-based effluent limitations; and (2) 'Receiving Water Limitations' that specify the water quality objectives in the Basin Plan as well as any other limitations necessary to attain those objectives. In summary, the 'Receiving Water Limitations' provision is the provision used to implement the requirements of CWA section 402(p)(3)(B). | high |
| #D174 | | Redevelopment | The creation and/or replacement of impervious surface on an already developed site. Examples include the expansion of a building footprint, road widening, the addition to or replacement of a structure. Replacement of impervious surfaces includes any activity where impervious material(s) are removed, exposing underlying soil during construction. Redevelopment does not include routine maintenance activities, such as trenching and resurfacing associated with utility work; pavement grinding; resurfacing existing roadways, sidewalks, pedestrian ramps, or bike lanes on existing roads; and routine replacement of damaged pavement, such as pothole repair. | high |
| #D175 | | Regional Clearinghouse | A central location for the collection and distribution of information developed and maintained by the Copermittees including, but not limited to, plans, reports, manuals, data, contact information, and/or links to such documents and information. | high |
| #D176 | | Rehabilitation | Remedial measures or activities for the purpose of improving or restoring the beneficial uses of streams, channels or river systems. Techniques may vary from in-stream restoration techniques to off-line storm water management practices installed in the system corridor or upland areas, or a combination of in-stream and out of stream techniques. Rehabilitation techniques may include, but are not limited to the following: riparian zone restoration, constructed wetlands, channel modifications that improve habitat and stability, and daylighting of drainage systems. | high |
| #D177 | | Reporting Period | The period of information that is reported in the Water Quality Improvement Plan Annual Report. The reporting period consists of two components: 1) July 1 to June 30, consistent with the fiscal year, for the implementation of the jurisdictional runoff management programs, and 2) October 1 to September 30, consistent with the monitoring year for the monitoring and assessment programs. Together, these two time periods constitute the reporting year for the Water Quality Improvement Plan Annual Report due January 31 following the end of the monitoring year. | high |
| #D178 | | Retain | Keep or hold in a particular place, condition, or position without discharge to surface waters. | high |
| #D179 | | Retrofitting | Storm water management practice put into place after development has occurred in watersheds where the practices previously did not exist or are ineffective. Retrofitting of developed areas is intended to improve water quality, protect downstream channels, reduce flooding, or meet other specific objectives. Retrofitting developed areas may include, but is not limited to replacing roofs with green roofs, disconnecting downspouts or impervious surfaces to drain to pervious surfaces, replacing impervious surfaces with pervious surfaces, installing rain barrels, installing rain gardens, and trash area enclosures. | high |
| #D180 | | Runoff | All flows in a storm water conveyance system that consists of the following components: (1) storm water (wet weather flows) and (2) non-storm water including dry weather flows. | high |
| #D181 | | San Diego Water Board | As used in this document the term "San Diego Water Board" is synonymous with the term "Regional Board" as defined in Water Code section 13050(b) and is intended to refer to the California Regional Water Quality Control Board for the San Diego Region as specified in Water Code Section 13200. | high |
| #D182 | | Sediment | Soil, sand, and minerals washed from land into water. Sediment resulting from anthropogenic sources (i.e. human induced land disturbance activities) is considered a pollutant. This Order regulates only the discharges of sediment from anthropogenic sources and does not regulate naturally occurring sources of sediment. Sediment can destroy fish-nesting areas, clog animal habitats, and cloud waters so that sunlight does not reach aquatic plants. | high |
| #D183 | | Source Control BMP | Land use or site planning practices, or structural or nonstructural measures that aim to prevent runoff pollution by reducing the potential for contamination at the source of pollution. Source control BMPs minimize the contact between pollutants and runoff. | high |
| #D184 | | Storm Water | Per 40 CFR 122.26(b)(13), means storm water runoff, snowmelt runoff and surface runoff and drainage. Surface runoff and drainage pertains to runoff and drainage resulting from precipitation events. | high |
| #D185 | | Structural BMPs | A subset of BMPs which detains, retains, filters, removes, or prevents the release of pollutants to surface waters from development projects in perpetuity, after construction of a project is completed. | high |
| #D186 | | Test of Significant Toxicity (TST) | A statistical approach used to analyze toxicity test data. The TST incorporates a restated null hypothesis, Welch's t-test, and biological effect thresholds for chronic and acute toxicity. | high |
| #D187 | | Total Maximum Daily Load (TMDL) | The maximum amount of a pollutant that can be discharged into a water body from all sources (point and non-point) and still maintain water quality standards. Under CWA section 303(d), TMDLs must be developed for all water bodies that do not meet water quality standards after application of technology-based controls. | high |
| #D188 | | Toxicity | Adverse responses of organisms to chemicals or physical agents ranging from mortality to physiological responses such as impaired reproduction or growth anomalies. The water quality objectives for toxicity provided in the Basin Plan, state in part…'All waters shall be free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life….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.' | high |
| #D189 | | Toxicity Identification Evaluation (TIE) | A set of procedures for identifying the specific chemical(s) responsible for toxicity. These procedures are performed in three phases (characterization, identification, and confirmation) using aquatic organism toxicity tests. | high |
| #D190 | | Toxicity Reduction Evaluation (TRE) | A study conducted in a step-wise process designed to identify the causative agents of effluent or ambient toxicity, isolate the sources of toxicity, evaluate the effectiveness of toxicity control options, and then confirm the reduction in toxicity. The first steps of the TRE consist of the collection of data relevant to the toxicity, including additional toxicity testing, and an evaluation of facility operations and maintenance practices, and best management practices. A Toxicity Identification Evaluation (TIE) may be required as part of the TRE, if appropriate. | high |
| #D191 | | Treatment Control BMP | Any engineered system designed to remove pollutants by simple gravity settling of particulate pollutants, filtration, biological uptake, media absorption or any other physical, biological, or chemical process. | high |
| #D192 | | Unpaved Road | Any long, narrow stretch without pavement used for traveling by motor passenger vehicles between two or more points. Unpaved roads are generally constructed of dirt, gravel, aggregate or macadam and may be improved or unimproved. | high |
| #D193 | | Waste | As defined in CWC Section 13050(d), 'waste includes sewage and any and all other waste substances, liquid, solid, gaseous, or radioactive, associated with human habitation, or of human or animal origin, or from any producing, manufacturing, or processing operation, including waste placed within containers of whatever nature prior to, and for purposes of, disposal.' | high |
| #D194 | | Water Quality Objective | Numerical or narrative limits on constituents or characteristics of water designated to protect designated beneficial uses of the water. [California Water Code Section 13050 (h)]. California's water quality objectives are established by the State and Regional Water Boards in the Water Quality Control Plans. Numeric or narrative limits for pollutants or characteristics of water designed to protect the beneficial uses of the water. In other words, a water quality objective is the maximum concentration of a pollutant that can exist in a receiving water and still generally ensure that the beneficial uses of the receiving water remain protected (i.e., not impaired). Since water quality objectives are designed specifically to protect the beneficial uses, when the objectives are violated the beneficial uses are, by definition, no longer protected and become impaired. This is a fundamental concept under the Porter Cologne Act. Equally fundamental is Porter Cologne's definition of pollution. A condition of pollution exists when the water quality needed to support designated beneficial uses has become unreasonably affected or impaired; in other words, when the water quality objectives have been violated. These underlying definitions (regarding beneficial use protection) are the reason why all waste discharge requirements implementing the federal NPDES regulations require compliance with water quality objectives. (Water quality objectives are also called water quality criteria in the CWA.) | high |
| #D195 | | Water Quality Standards | Water quality standards, as defined in Clean Water Act section 303(c) consist of the beneficial uses (e.g., swimming, fishing, municipal drinking water supply, etc.,) of a water body and criteria (referred to as water quality objectives in the California Water Code) necessary to protect those uses. Under the Water Code, the water boards establish beneficial uses and water quality objectives in water quality control or basin plans. Together with an anti-degradation policy, these beneficial uses and water quality objectives serve as water quality standards under the Clean Water Act. In Clean Water Act parlance, state beneficial uses are called 'designated uses' and state water quality objectives are called 'criteria.' Throughout this Order, the relevant term is used depending on the statutory scheme. | high |
| #D196 | | Waters of the State | Any water, surface or underground, including saline waters within the boundaries of the State [CWC section 13050 (e)]. The definition of the Waters of the State is broader than that for the Waters of the United States in that all water in the State is considered to be a Waters of the State regardless of circumstances or condition. | high |
| #D197 | | Waters of the United States | As defined in the 40 CFR 122.2, the Waters of the U.S. are defined as: '(a) All waters, which are currently used, were used in the past, or may be susceptible to use in interstate or foreign commerce, including all waters which are subject to the ebb and flow of the tide; (b) All interstate waters, including interstate 'wetlands;' (c) All other waters such as intrastate lakes, rivers, streams (including intermittent streams), mudflats, sandflats, 'wetlands,' sloughs, prairie potholes, wet meadows, playa lakes, or natural ponds the use, degradation or destruction of which would affect or could affect interstate or foreign commerce including any such waters: (1) Which are or could be used by interstate or foreign travelers for recreational or other purposes; (2) From which fish or shellfish are or could be taken and sold in interstate or foreign commerce; or (3) Which are used or could be used for industrial purposes by industries in interstate commerce; (d) All impoundments of waters otherwise defined as waters of the United States under this definition: (e) Tributaries of waters identified in paragraphs (a) through (d) of this definition; (f) The territorial seas; and (g) 'Wetlands' adjacent to waters (other than waters that are themselves wetlands) identified in paragraphs (a) through (f) of this definition. Waters of the United States do not include prior converted cropland. Notwithstanding the determination of an area's status as prior converted cropland by any other federal agency, for the purposes of the Clean Water Act, the final authority regarding Clean Water Act jurisdiction remains with the EPA.' | high |
| #D198 | | Watershed | That geographical area which drains to a specified point on a water course, usually a confluence of streams or rivers (also known as drainage area, catchment, or river basin). | high |
| #D199 | | Wet Season (aka Rainy Season) | October 1 to April 30 | high |
| #D200 | | Wet Weather | Weather is considered wet up to 72 hours after a storm event of 0.1 inches and greater, unless otherwise defined by another regulatory mechanism (e.g. a TMDL). | high |
| #D201 | | Bypass | ‘Bypass’ means the intentional diversion of waste streams from any portion of a treatment facility. (40 CFR § 122.41(m)(1)(i).) | high |
| #D202 | | Severe property damage | ‘Severe property damage’ means substantial physical damage to property, damage to the treatment facilities which causes them to become inoperable, or substantial and permanent loss of natural resources which can reasonably be expected to occur in the absence of a bypass. Severe property damage does not mean economic loss caused by delays in production. [40 CFR 122.41(m)(1)(ii)] | high |
| #D203 | | Upset | Upset means an exceptional incident in which there is unintentional and temporary noncompliance with technology based permit effluent limitations because of factors beyond the reasonable control of the Copermittee. An upset does not include noncompliance to the extent caused by operational error, improperly designed treatment facilities, inadequate treatment facilities, lack of preventive maintenance, or careless or improper operation. [40 CFR 122.41(n)(1)] | high |
| #D204 | | At the point of discharge(s) | Means in the surf zone immediately where runoff from an outfall meets the ocean water (a.k.a., at point zero). | high |
| #D205 | | Areas of Special Biological Significance (ASBS) | Those areas designated by the State Water Board as ocean areas requiring protection of species or biological communities to the extent that alteration of natural water quality is undesirable. All Areas of Special Biological Significance are also classified as a subset of State Water Quality Protection Areas. | high |
| #D206 | | Design storm | For purposes of these Special Protections, a design storm is defined as the volume of runoff produced from one inch of precipitation per day or, if this definition is inconsistent with the discharger's applicable storm water permit, then the design storm shall be the definition included in the discharger's applicable storm water permit. | high |
| #D207 | | Development | Relevant to reference monitoring sites, means urban, industrial, agricultural, grazing, mining, and timber harvesting land uses. | high |
| #D208 | | Higher threat discharges | Permitted storm drains discharging equal to or greater than 18 inches, industrial storm drains, agricultural runoff discharged through an MS4, discharges associated with waterfront and marina operations (e.g., piers, launch ramps, mooring fields, and associated vessel support activities, except for passive discharges defined below), and direct discharges associated with commercial or industrial activities to ASBS. | high |
| #D209 | | Low Impact Development (LID) | A sustainable practice that benefits water supply and contributes to water quality protection. Unlike traditional storm water management, which entails collecting and conveying storm water runoff through storm drains, pipes, or other conveyances to a centralized storm water facility, LID focuses on using site design and storm water management to maintain the site's pre-development runoff rates and volumes. The goal of LID is to mimic a site's predevelopment hydrology by using design techniques that infiltrate, filter, store, evaporate, and detain runoff close to the source of rainfall. | high |
| #D210 | | Marine Operations | Marinas or mooring fields that contain slips or mooring locations for 10 or more vessels. | high |
| #D211 | | Management Measure (MM) | Economically achievable measures for the control of the addition of pollutants from various classes of nonpoint sources of pollution, which reflect the greatest degree of pollutant reduction achievable through the application of the best available nonpoint pollution control practices, technologies, processes, siting criteria, operating methods, or other alternatives. For example, in the 'marinas and recreational boating' land- use category specified in the Plan for California's Nonpoint Source Pollution Control Program (NPS Program Plan) (SWRCB, 1999), 'boat cleaning and maintenance' is considered a MM or the source of a specific class or type of NPS pollution. | high |
| #D212 | | Management Practice (MP) | The practices (e.g., structural, non-structural, operational, or other alternatives) that can be used either individually or in combination to address a specific MM class or classes of NPS pollution. For example, for the 'boat cleaning and maintenance' MM, specific MPs can include, but are not limited to, methods for the selection of environmentally sensitive hull paints or methods for cleaning/removal of hull copper anti- fouling paints. | high |
| #D213 | | Municipal Separate Storm Sewer System (MS4) | A municipally-owned storm sewer system regulated under the Phase I or Phase II storm water program implemented in compliance with Clean Water Act section 402(p). Note that an MS4 program's boundaries are not necessarily congruent with the permittee's political boundaries. | high |
| #D214 | | Natural Ocean Water Quality | The water quality (based on selected physical, chemical and biological characteristics) that is required to sustain marine ecosystems, and which is without apparent human influence, i.e. , an absence of significant amounts of: (a) man-made constituents ( e.g., DDT); (b) other chemical ( e.g., trace metals), physical (temperature/thermal pollution, sediment burial), and biological ( e.g. , bacteria) constituents at concentrations that have been elevated due to man's activities above those resulting from the naturally occurring processes that affect the area in question; and (c) non-indigenous biota ( e.g., invasive algal bloom species) that have been introduced either deliberately or accidentally by man. | high |
| #D215 | | Nonpoint source | Nonpoint pollution sources generally are sources that do not meet the definition of a point source. Nonpoint source pollution typically results from land runoff, precipitation, atmospheric deposition, agricultural drainage, marine/boating operations or hydrologic modification. Nonpoint sources, for purposes of these Special Protections, include discharges that are not required to be regulated under an NPDES permit. | high |
| #D216 | | Non-storm water discharge | Any runoff that is not the result of a precipitation event. This is often referred to as 'dry weather flow.' | high |
| #D217 | | Non-structural control | A Best Management Practice that involves operational, maintenance, regulatory (e.g., ordinances) or educational activities designed to reduce or eliminate pollutants in runoff, and that are not structural controls (i.e. there are no physical structures involved). | high |
| #D218 | | Physical impossibility | Means any act of God, war, fire, earthquake, windstorm, flood or natural catastrophe; unexpected and unintended accidents not caused by discharger or its employees' negligence; civil disturbance, vandalism, sabotage or terrorism; restrain by court order or public authority or agency; or action or non-action by, or inability to obtain the necessary authorizations or approvals from any governmental agency other than the permittee. | high |
| #D219 | | Representative sites and monitoring procedures | Are to be proposed by the discharger, with appropriate rationale, and subject to approval by Water Board staff. | high |
| #D220 | | Sheet-flow | Runoff that flows across land surfaces at a shallow depth relative to the cross- sectional width of the flow. These types of flow may or may not enter a storm drain system before discharge to receiving waters. | high |
| #D221 | | Storm Season | Also referred to as rainy season, means the months of the year from the onset of rainfall during autumn until the cessation of rainfall in the spring. | high |
| #D222 | | Structural control | A Best Management Practice that involves the installation of engineering solutions to the physical treatment or infiltration of runoff. | high |
| #D223 | | Surf Zone | The surf zone is defined as the submerged area between the breaking waves and the shoreline at any one time. | high |
| #D224 | | Surface Water Ambient Monitoring Program (SWAMP) comparable | Means that the monitoring program must 1) meet or exceed 2008 SWAMP Quality Assurance Program Management Plan (QAPP) Measurement Quality Objectives, or 2) have a Quality Assurance Project Plan that has been approved by SWAMP; in addition data must be formatted to match the database requirements of the SWAMP Information Management System. | high |
| #D225 | | Waterfront Operations | Piers, launch ramps, and cleaning stations in the water or on the adjacent shoreline. | high |
| #D226 | | Persistent flow | Persistent flow is defined as the presence of flowing, pooled, or ponded water more than 72 hours after a measureable rainfall event of 0.1 inch or greater during three consecutive monitoring and/or inspection events. | high |
| #D227 | | transient | All other flowing, pooled, or ponded water is considered transient. | high |
| #D228 | | escalated enforcement | Escalated enforcement must include any enforcement scenario where a violation or other non-compliance is determined to cause or contribute to the highest priority water quality conditions identified in the Water Quality Improvement Plan. | high |
| #D229 | | interim and final numeric goals | Interim and final numeric goals may take a variety of forms such as TMDL established WQBELs, action levels, pollutant concentration, load reductions, number of impaired water bodies delisted from the List of Water Quality Impaired Segments, Index of Biotic Integrity (IBI) scores, or other appropriate metrics. | high |
| #D230 | | Annual milestones | Annual milestones for each final numeric goal must be clearly and directly linked to, or demonstrate progress is being made toward the achievement of the final numeric goal. The annual milestones may consist of water quality improvement strategy implementation phases, interim numeric goals, and other acceptable metrics. | high |
| #D231 | | Copermittee | The term Copermittee in this Order refers to any San Diego County, Orange County, or Riverside County Copermittee covered under this Order, unless specified otherwise. | high |
| #D232 | | TMDLs | TMDLs are numerical calculations of the maximum amount of a pollutant that a water body can assimilate and still meet water quality standards. | high |
| #D233 | | TMDL | A TMDL is the sum of the allowable loads of a single pollutant from all contributing point sources (waste load allocations or WLAs) and non-point sources (load allocations or LAs), background contribution, plus a margin of safety. | high |