Coastal Tijuana EA
Coastal Tijuana EA
Coastal Tijuana EA
Prepared for:
Comisin Estatal de Servicios Pblicos de Tijuana
Border Environment Cooperation Commission
U.S Environmental Protection Agency
Table of Contents Transboundary Environmental Assessment (EA) for Coastal Tijuana Wastewater Collection Improvement Projects
CONTENTS
SECTION 1 PURPOSE AND NEED FOR ACTION............................................................................. 1-1
1.1 1.2 1.3 1.4 1.5 1.6 Introduction ................................................................................................. 1-1
Legal Framework ....................................................................................... 1-1
Project Location and Study Area ............................................................. 1-2
Purpose and Need for Proposed Action.................................................. 1-3
Scope of Environmental Assessment ...................................................... 1-3
Relevant Environmental Issues................................................................. 1-4
Table of Contents Transboundary Environmental Assessment (EA) for Coastal Tijuana Wastewater Collection Improvement Projects
Table of Contents Transboundary Environmental Assessment (EA) for Coastal Tijuana Wastewater Collection Improvement Projects
SECTION 7
REFERENCES......................................................................................................................... 6-1
Table of Contents Transboundary Environmental Assessment (EA) for Coastal Tijuana Wastewater Collection Improvement Projects
Table of Contents Transboundary Environmental Assessment (EA) for Coastal Tijuana Wastewater Collection Improvement Projects
Tables
1-1 2-1 2-2 2-3 2-4 3-1 3-2 3-3 3-4 3-5 4-1 4-2 4-3 Summary of Proposed Action ..................................................................................................1-3
Wastewater Treatment Plants Serving Tijuanas Coastal Areas .........................................2-2
Areas Served by the Proposed Projects...................................................................................2-3
Service Details to Connect Unserved Colonias to San Antonio de los Buenos WWTP Collection System ...........................................................................................2-5
Service Details to Connect El Monte to Tecolote-La Gloria WWTP Collection System.......................................................................................................................2-5
State and Federal National Ambient Air Quality Standards Maximum Concentration Averaged Over Specific Time Period ........................................3-2
Summary of Air Quality Data for the San Diego Air Basin .................................................3-3
Monthly Mean Values of Selected Water Quality Parameters during 2004 ......................3-8
Groundwater Data Collected for the Groundwater Flow model for the Tijuana River Basin Project .................................................................................................... 3-11
List of Threatened and Endangered Species in Imperial Beach Quad .............................3-14
Summary of Impacts to the United States Resulting from the No Action Alternative......................................................................................................................4-2
Summary of Impacts to the United States Resulting from Alternative A .............................................................................................................................4-7
Summary of Impacts to the United States Resulting from Alternative B .............................................................................................................................4-12
Figures
1-1 Area of Interest..........................................................................................................1-5
2-1 Action Alternatives ..................................................................................................2-4
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This EA is extensively based on information contained in the Potable Water and Wastewater Master Plan for Tijuana and Playas de Rosarito (CDM, 2003); the Environmental Assessment for the Potable Water and Wastewater Master Plan for Tijuana and Playas de Rosarito (CDM, 2003), and; the Manifestacin de Impacto Ambiental (CDM, 2003) prepared for the Master Plan to comply with environmental review requirements of the Baja California State Ecology Department. Additional information was obtained from previous environmental impact statements and other sources, as referenced. A description of the project alternatives was provided by the Commisin Estatal de Servicios Pblicos de Tijuana (CESPT), including projected flows, pipeline alignments, diameters, and wastewater treatment and effluent disposal methods. Potential adverse and beneficial environmental impacts of the action alternatives, as well as the no action alternative are described in the EA. The document was prepared in general accordance with the BEIF Environmental Assessment Guidelines developed by BECC. It includes an evaluation of current conditions, and potential impacts including, but not limited to, near-term, long-term and cumulative. The main objective of this document is to describe transboundary impacts (i.e. impacts in the United States) associated with the alternatives evaluated in the planning documents previously described, although reference is also made to potential impacts in Mexico to the extent that they may influence effects in the U.S.
the US-Mexican border which includes the Tijuana River and its estuary in the U.S. and coastal areas directly north of the border. Figure 1-1 shows the locations of the proposed action in relation to the area of interest.
Proposed Action
Service Details 7,292 m sewer pipeline connecting to San Antonio de los Buenos WWTP 5,970 m sewer pipeline connecting to Tecolote-La Gloria WWTP
Wastewater Services
El Monte
1,243
alternative or one of the action alternatives. This EA was prepared following the scope of work presented under BECCs BEIF Environmental Assessment Guidelines for Mexican environmental infrastructure projects for which BEIF funding is sought. The organization of this document follows that established by the BECC scope of work. The following general topics are included in the scope of this EA: Description of Alternatives Environmental Setting Direct and Indirect Transboundary Impacts Analysis Cumulative Transboundary Impacts Analysis
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The coastal communities of Tijuana are between 8 and 14 miles (13-23 km) south of the U.S.-Mexico international border. Many environmental resources, including groundwater and floodplains, in the U.S. would not be affected because of the projects distance south of the border. Municipal services in Mexico would be improved by increasing the potable water services and collection coverage of the wastewater system, but municipal services in the U.S. would not be affected by any of the alternatives. Many resources in the U.S. would not be affected because all construction activities for the project would occur in Mexico. There are no wild and scenic rivers in the U.S. study area that could be affected. The Tijuana River Estuary is a national natural landmark. It would not be directly affected because there is no construction in the U.S. Potential indirect effects could occur through changes in the Pacific Oceans water quality along the U.S. coast. Effects to the Tijuana River Estuary are addressed in the water quality and biological resources analyses. Any hazardous or solid waste produced during project construction would not affect the study area in the U.S. because all waste would remain, be handled, and disposed of in Mexico, according to applicable Mexican regulations. There would be no direct or indirect effects to U.S. landfills or hazardous waste sites from the project. Land use in Mexico may be affected if construction activities took place within areas not previously disturbed or currently in use, however much of the construction activity would take place on previously disturbed land. The project would not affect land use in the U.S. because the proposed action does not include construction in the U.S. Construction activities that generate noise, dust and other air quality emissions would not affect the U.S. because of the distance of the construction sites to the U.S. Additionally; construction in Mexico would not affect historic and cultural resources and geology in the U.S. because of the distance to the U.S.-Mexico border. The alternatives could affect surface water quality by changing wastewater discharges to the Pacific Ocean. Changes in coastal water quality could indirectly affect biological and coastal resources in the U.S. Terrestrial biological resources would not be directly affected because of the distance of the projects to the U.S. If water quality along U.S. beaches changes, the public health of swimmers and beach-goers could be affected. Additionally, if beaches are closed for public health reasons, recreation and tourism industries could be affected. The project would improve public health in Mexico, and because of frequent border crossings, this could reduce potential health threats to the U.S. The U.S. border region shares close economic ties with the Tijuana region. This border economy could improve if the proposed action is implemented. Environmental justice in the U.S. would not be an issue because construction activities that could affect low income and minority populations would not occur within the U.S. In summary, hazardous and solid waste, land use, wild and scenic rivers, and municipal services in the U.S. study area would not be directly or indirectly affected by 1-6
the alternatives and therefore are not relevant for further detailed evaluation. Cultural resources, geology, groundwater, floodplains, and environmental justice are covered in the impacts evaluation to further assess potential indirect effects. Surface water resources and quality, biological resources, wetlands, coastal resources, socioeconomics, and public health may be relevant environmental resources and services are linked to the alternatives evaluation, and are assessed in greater detail in this EA. Also, potential indirect effects of construction activities on air quality and noise in the U.S. are analyzed in this EA.
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be needed such as from a WWTP in the Alamar valley. Wastewater treatment facilities in the Alamar valley are still in the planning phase and therefore are not included in this analysis. JBIC Facilities Currently there are three wastewater treatment plants under construction, referred to as the JBIC facilities for their funding source, a loan from the Japan Bank for International Cooperation. Two of the plants, La Morita and Monte de los Olivos which start operations in 2008, will serve some areas in the Tijuana River watershed that currently have wastewater collection service and treatment, provided either at South Bay International Water Treatment Plant (SBIWTP) in San Diego, or at the San Antonio de los Buenos WWTP along the coast in Mexico. As a result flows will be reallocated in the system and the San Antonio de los Buenos WWTP capacity will be available to receive flows generated at Granjas la Esperanza. La Morita WWTP will provide advanced secondary treatment with a design capacity of 5.8 mgd (254 L/s.) WWTP expansion to 8.7 mgd (380 L/s) is anticipated. The Monte de los Olivos WWTP will provide advanced secondary treatment with a capacity of 10.4 mgd (460 L/s.) It will be constructed in two modules of 5.2 mgd (230 L/s) each. Tecolote-La Gloria WWTP The Tecolote-La Gloria WWTP is one of the three plants financed by the JBIC Credit. It is located south of the San Antonio de los Buenos WWTP. Figure 2-1 shows the Tecolote-La Gloria WWTP within the Tijuana coastal area. The plant should be operational in 2009 and it will have a treatment capacity of 8.7 mgd (380 L/s) and discharge effluent into the Pacific Ocean. The Tecolote-La Gloria WWTP will provide advanced secondary treatment using oxidation ditch activated sludge treatment process and include construction of two modules of primary and secondary treatment of 4.3 mgd (190 L/s). This would satisfy demands in its service area through the year 2025. Table 2-1 summarizes the WWTP capacity and expected flows of the two WWTP serving the project communities.
Table 2-1 Wastewater Treatment Plants Serving Tijuanas Coastal Areas WWTP San Antonio de los Buenos 1 Tecolote la Gloria
1 Assuming
Expected Flows (MGD) 2007 32 2008 20 2009 21 3.2 2010 22 3.9 2015 14* 6.1 2020 21* 6.7 2025 25* 7.5 Discharge Ocean Ocean
La Morita and Monte de los Olivos WWTP in operation * Assuming Alamar WWTP in operation
2-2
In addition to these colonias and their associated flows, there are other uncollected residential sewage flows that run into canyons and creeks and discharge untreated to the ocean. Those flows would be connected to the Tecolote-La Gloria wastewater treatment plant when it becomes operational in 2009. Under the No Action alternative the only wastewater discharged untreated to the ocean would be the 0.17 mgd (7.33 L/s) from the project areas.
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Under Action Alternative A (preferred), wastewater generated in Granjas La Esperanza would be delivered for treatment to the existing San Antonio de los Buenos (Punta Bandera) WWTP through a gravity line of approximate 5120 ft (1561 m). Wastewater from El Monte would be delivered by gravity to the Tecolote-La Gloria WWTP through a gravity line of approximate 2870 ft (875 m). Both WWTPs discharge effluent into the Pacific Ocean off the coast of Mexico. Under Action Alternative B, wastewater generated in Granjas La Esperanza would be delivered at the Tecolote-La Gloria WWTP using a 4 HP lift station and a 6-inch (15 cm) pressurized line to convey the flows approximately 3600 ft (1097 m). Wastewater generated in El Monte would require two lift stations and two pressurized lines of 400 ft and 1940 ft (121 m and 590 m) to convey the flows to the Tecolote-La Gloria WWTP.
Both alternatives A and B are equal in terms of the population served and the wastewater flows generated and collected from both communities. Figures describing the location of Alternative A and Alternative B are presented in Appendix B.
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Section 2 Description of Alternatives Table 2-3 Collection System Service Details to Connect Unserved Colonias to SAB WWTP Unserved Number of Proposed Pipeline Length Status of Community Connections (ft/m) - Diameter (in) Trunk Line Total 23,920 ft (7,292 m) 511 ft (156 m) - 4" Granjas La Constructed 348 Esperanza 18,290 ft (5,575 m) - 8" 5, 121 ft (1,561 m) - 15" Table 2-4 Collection System Service Details to Connect El Monte to Tecolote-La Gloria WWTP Unserved Community El Monte Number of Connections 296 Proposed Pipeline Length (ft /m) - Diameter (in) Total 19,580 ft (5,970 m) 16,715 ft (5,095 m) - 8 2,870 ft (875 m) - 10 Status of Trunk Line Proposed
The Tecolote-La Gloria plant, with a capacity of 8.7 mgd (380 L/s), would have sufficient capacity in the short and long term to treat the average annual and peak flows from El Monte. Alternative A uses gravity flow, offering greater reliability and minimized energy need over the life of the facility.
Granjas La Esperanza
El Monte
296
Proposed
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3.1.1 Climate
The climate in San Diego County is influenced by the Pacific Ocean and its highpressure systems, which result in dry, warm summers and mild, occasionally wet winters. The normal wind pattern throughout the County is predominantly westerly to northwesterly (i.e., blows predominantly towards the east and southeast) (City of San 3-1
Diego Metropolitan Wastewater Department (MWWD), 1996). This pattern is occasionally disrupted by the Santa Ana wind conditions, during which offshore winds blow pollutants out to the ocean, resulting in clear days. If the Santa Ana conditions are combined with a low pressure system in Baja California, a pollutant laden air mass is drawn southward from Los Angeles and Orange Counties to produce some of the highest levels of air pollution found in the SDAB. During the winter, afternoon temperatures vary from 60 F to 80 F, summer temperatures range from 80F to 100F. The average annual precipitation in the area is 9.5 inches, falling predominantly from November through April (CH2M HILL, 1998).
A common expression of ambient air quality is the number of days air pollution levels exceed the federal and state standards shown in Table 3-1. Table 3-2 shows the annual number of days that pollutants exceeded the state and federal ambient air quality standards in the SDAB during 2000 to 2004. 3-2
Table 3-2 Summary of Air Quality Data for the San Diego Air Basin Number of Days Over Standard 2000 2001 2002 2003 2004 Federal 0 2 0 1 1 State 24 29 15 23 12 State and Federal 0 0 0 0 0 State and Federal State and Federal State and Federal Federal Annual Arithmetic Average (ug/m3) Federal 24-Hour State Annual Arithmetic Average (ug/m3) State 24-Hour Federal Annual Arithmetic Average (ug/m3) Federal 24-Hour Concentration 0 0 *** no no yes yes yes yes 0 0 *** no no yes yes yes no 0 0 *** yes* no yes yes yes no 0 0 *** yes* no** yes yes yes no** 0 0 *** yes* no yes yes no yes yes
Particulates (PM10)*
Particulates (PM2.5)*
State Annual Arithmetic yes yes yes yes Average (ug/m3) Source: San Diego Air Pollution Control District (SDAPCD, 2004). *Exceeding only at the Otay Mesa Monitoring location **Unusually high levels due to wild fires in 2003. Data without wildfires shows no exceedances. *** Data not available, however, SDAB is designated as an attainment area for lead
Ozone Ozone is produced as the end result of a chain of chemical reactions that produce a photochemical smog from hydrocarbon emissions. This combined with climatological and meteorological factors have made it difficult to control ozone concentrations in the SDAB. As a result the SDAB currently has a federal ozone designation of non attainment, and state ozone designation of serious non attainment (CARB, 2005). Particulates The SDAB is in attainment with the federal standards for both PM10, and PM2.5, but is currently listed in non-attainment status with the state for both standards (CARB, 2005b). The state standards have been difficult to meet due to natural particulate matter sources and the areas dry climate (SDAPCD, 2004). Local air pollution sources from within the area of influence (i.e., from sources within the U.S.) include vehicular air pollution on Interstate 5 and the more developed pockets along the border such as around the border crossing; and aircraft operations associated 3-3
with Brown Field and the Imperial Beach Naval Auxiliary Landing Field; and general urban activities within.
3.1.3 Noise
The area of influence with respect to noise is limited to those areas in the U.S. that are immediately adjacent to the international boundary. Due to the highly urbanized nature of Tijuana near the international border and the existing noise environment throughout much of the urbanized area immediately adjacent to the border within the U.S., the study area is characterized primarily by vehicular noise from car and truck travel, commercial aircraft noise from operations at the Aeropuerto de Tijuana, and general urban activities. Local noise sources from within the area of influence include vehicular noise on Interstate 5 and local roads, aircraft operations associated with Brown Field and the Imperial Beach Naval Auxiliary Landing Field, and general urban activities within the more developed pockets along the border such as around the border crossing stations. Ambient noise levels are estimated to range from approximately 45 decibels A-weighted (dBA) in remote undeveloped areas to over 70 dB near freeways and highly urbanized areas. Noise Standards The City of San Diego established noise ordinances that regulate construction and operation noise levels on specific types of land uses. Although these noise ordinances do not apply to activities occurring outside of the U.S., they provide a reasonable basis for evaluating the significance of potential noise impacts associated with the proposed action. Ordinance 59.5.0404 states that construction noises may not exceed 75 decibels equivalent sound level (dB Leq) between 7:00 A.M. and 7:00 P.M. in residential areas. Operational noise levels (established in Ordinance 59.5.0401) vary by land use type, and are lower during the nighttime. Residential uses range from 45 dB Leq to 60 db Leq, commercial ranges from 60 dB Leq to 65 dB Leq, and industrial uses have a limit of 75 dB Leq (Recon, 1994). Sensitive Noise Receptors Sensitive noise receptors typically include residential development, schools, and hospitals. Under certain conditions, habitat areas can also be considered to be sensitive receptors, such as when noise levels exceed 60 dBA in nesting areas for least Bells vireo (Vireo bellii) and California gnatcatcher(Polioptila californica californica) during the respective breeding seasons. Federal regulatory guidelines establish the following breeding seasons for these two species: February 15 through August 30 for the least Bells vireo, and April 10 through July 31 for the California gnatcatcher. In general, the presence of such receptors is limited to the western portion of the area of influence. Rural residential development occurs in and near the Tijuana River estuary. 3-4
Residential subdivisions occur to the north of the Tijuana River between Dairy Mart Road and Interstate 5, as does a public school located southwest of the Interstate 5/Via de San Ysidro interchange. With the exception of areas immediately adjacent to Interstate 5, the area of influence east of Interstate 5 is generally undeveloped or is occupied by non-sensitive uses such as agricultural or industrial/business park development.
3.2 Floodplains
The Tijuana River valley consists mainly of a broad floodplain surrounded by urban development. Flooding is a major issue on the U.S. side in the lower Tijuana River valley (SDSU, 2000). The 100-year and 500-year Tijuana River floodplain limits in the study area are shown on the U.S. Federal Emergency Management Agency (FEMA) Federal Insurance Administration on Flood Insurance Rate Maps (FIRM) 06073C2161 F, 06073C2162 F, and 06073C2166. A 100-year flood has a 1 percent chance of occurring in any given year, while a 500-year flood has a 0.2 percent chance of occurring in any given year.
3.3 Wetlands
The Tijuana River National Estuarine Research Reserve and the Tijuana River Valley portion of the study area include one of the largest and most important wetland systems in San Diego County and Southern California. The estuary supports extensive salt marsh and saltpan habitats. Significant efforts are being made to eliminate pollution, restore wetlands, and reintroduce endangered species into this environmentally sensitive area. The City of San Diegos Multiple Species Conservation Program (MSCP) proposes to preserve these areas and their natural habitats. The County of San Diego is acquiring land for the development of a regional park in the Tijuana River Valley (SDSU, 2000).
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environmental impacts. However, this plant does not meet U.S. quality standards on several parameters, among them toxicity. There are plans to provide secondary level treatment located immediately adjacent to the existing primary WWTP in the U.S. Tecolote-La Gloria WWTP The Tecolote-La Gloria WWTP is one of the three plants being financed by the Japanese Credit. The plant should be operating by 2009. It will have a treatment capacity of 8.7 mgd (380 L/s) and discharge effluent directly into the Pacific Ocean. The Tecolote-La Gloria WWTP will provide advanced secondary treatment using oxidation ditch- activated sludge technology. The plant capacity of 8.7 mgd (380 L/s) includes construction of two modules of primary and secondary treatment of 4.3 mgd (190 L/s). This would satisfy demands through the year 2025. Rosarito Plants Rosarito, located 18 miles (30 km) south of the border, has two secondary wastewater treatment plants discharging directly to the Pacific Ocean Rosarito and Rosarito Norte. The Rosarito Norte WWTP with capacity of 4.8 mgd (210 L/s), provides secondary treatment using activated sludge technology. The plant was recently updated with funds from the JBIC. There is an anticipated upgrade for the Rosarito I WWTP from 1.4 to 3.2 mgd (60 L/s to 120 L/s). The upgrade will provide secondary treatment through the oxidation ditch-activated sludge technology. Rosarito I discharges to the Pacific Ocean through the Huahuatay submarine discharge. The currents found along the coast of California are controlled mainly by the offshore, southward-flowing California current, which consists of a (1) broad southerly current that flows near the edge of and beyond the continental shelf, (2) an undercurrent flowing northerly under the southern current, and (3) coastal countercurrents flowing northerly at the surface and near surface (CDM, 2003). The California current varies in position and intensity based on the season, shifting onshore during the spring and summer. The northward flowing countercurrent is found at a depth of 90 feet (27 meters) and flows from Baja California to northern California, bringing warm, high salinity Equatorial Pacific water. There is an equatorial coastal flow that occurs with the northerly undercurrent from early spring to fall caused by wind stresses. Once the wind stresses subside (September) a broad northward surface current called the Davidson current begins to develop approximately 62 miles (100 km) offshore. The dynamics of the flows are influenced by the interactions of the coastal currents within the California system and the seasonal upwelling events that bring cool, dense water to the surface (CDM, 2003). Modeling of the flow patterns found the principal pattern to be a relatively uniform long shore flow north and south along the coastline, and a recurring eddy with counterclockwise circulation south of Point Loma of varying intensity found anywhere 3-7
from 6.2 to 9.3 miles (9.92 to 14.88 km) offshore and roughly 10.6 miles (16.96 km) alongshore (CH2M HILL, 1998). Marine Water/Sediment Quality The City of San Diego performs monthly compliance monitoring for the SBOO. The sampling area extends from the tip of Point Loma southward to Punta Bandera, Baja California, Mexico, and from the shoreline seaward to a depth of 200 feet (61 meters). Monthly mean data for water temperature, salinity, density, pH, transmissivity (XMS), dissolved oxygen (DO), and chlorophyll a are presented in Table 3-3 (City of San Diego, 2004).
Table 3-3 Monthly Mean Values of Selected Water Quality Parameters during 2004* Month Temp Density Salinity D.O. pH Chlor XMS (oC) (/) (ppt) (mg/L) (g/L) (%) Jan 13.8 24.84 33.20 8.4 8.1 4.2 83 Feb 13.8 24.83 33.19 8.6 8.2 4.4 80 Mar 14.2 24.66 33.09 7.8 8.1 3.7 75 Apr 16.7 24.16 33.14 6.9 8.2 3.9 79 May 16.7 24.26 33.29 6.6 8.2 3.1 75 Jun 18.9 23.85 33.43 7.9 8.2 5.1 76 Jul 18.4 24.03 33.50 8.0 8.2 6.0 80 Aug 20.1 23.54 33.44 7.7 8.2 2.3 87 Sep 22.2 22.97 33.44 7.1 8.2 1.4 87 Oct 17.4 24.09 33.26 8.5 8.1 1.8 87 Nov 18.2 23.75 33.08 7.7 8.1 2.0 76 Dec 15.7 24.44 33.20 7.9 8.1 1.3 85 Source: City of San Diego, 2004 *These measurements were taken at the surface (<2 m depth).
Results showed that physical and chemical parameters reflect a seasonal pattern. During the winter, increased surf and wind conditions result in a mixed water column with little thermal stratification. Around April, conditions change due to an intrusion of cold water followed by a warming of surface waters, causing the water column to become well stratified. Summer and fall were marked by a shallow, seasonal thermocline most pronounced between 13 and 30 feet (4 and 9 meters) (City of San Diego, 2002). Fecal coliform samples at shore stations ranged from an annual average of 12 Colony Forming Units (CFU)/100 mL to 4,089 CFU/100 mL in 2006. Highest coliform levels were detected at stations near the mouth of the Tijuana River. Data indicate that the wastewater plume from the SBOO rarely reached the surface waters in 2006. Most elevated bacterial counts that indicate contamination near the surface occurred in January, March, April, June and October during periods of rainfall or when turbidity 3-8
plumes from the Tijuana River or Los Buenos Creek reached the stations (City of San Diego 2006). The water quality characteristic in the vicinity of the SBOO is a result of both oceanographic events and input from point and non-point anthropogenic sources. Physical and chemical parameters were largely affected by stormwater inputs and oceanographic conditions (City of San Diego, 2002). Sources of bacterial contamination found along the shoreline adjacent to the SBOO may include effluent from the South Bay International Wastewater Treatment Plant; effluent from the San Antonio de los Buenos wastewater treatment plant (and the chlorinatedonly wastewater that by-passes the plant); input from the Tijuana River; and coastal storm drain outlets. The coliform concentrations found offshore were highly variable and ranged between 6 and 4,070 CFU/mL (City of San Diego, 2002). The City of Imperial Beach regularly monitors for bacterial contamination. Beaches in the vicinity were closed due to bacterial contamination and sewage flows from the Tijuana Estuary for a total of 85 days in 2005 and 56 days in 2006 (County of San Diego Department of Environmental Health, 2006). The waste plume from the SBOO typically remains offshore and at depth, due to the thermal stratification found during most of the year. The plume does surface occasionally under non-stratification conditions. Due to the numerous anthropogenic inputs, it is difficult to make a clear distinction between water quality changes caused by the SBOO and other sources. In general, shoreline sources of contamination tend to affect the nearshore waters. Monitoring results from the City of San Diego 2001 study suggest that discharge from the SBOO does not affect the shoreline and remains at the bottom near the diffuser (City of San Diego, 2002). Sediments surrounding the SBOO were generally found to be fine sands with a mean particle size of 2.3 phi (phi = -log2 (size in mm)). Higher concentrations of most trace metals and organic compounds were found in finer sediments, but those concentrations found near the SBOO were low when compared to the entire southern California continental shelf. Aluminum, chromium, copper, iron, manganese, zinc, and arsenic were found at all stations. Other contaminants were seen only occasionally; derivatives of the chlorinated pesticide DDT were detected at three monitoring stations, and PCB compounds were present at one station (City of San Diego, 2002).
3.5.2 Groundwater
Groundwater in the lower Tijuana River Valley occurs in the following three zones: (1) beneath Nestor Terrace north of the valley, (2) in the alluvial fill underlying the Tijuana River valley, and (3) in the San Diego Formation beneath the alluvium. Of the three, the alluvium fill has been most used and studied (CH2M HILL, 1998). The aquifer in this 3-9
area is unconfined and can potentially store up to 65,000 acre-feet of water. The aquifer rests atop a bedrock surface and, on the average, consists of 50 to 90 feet (15 to 27 meters) of sand and silt overlying 10 to 35 feet (3 to 11 meters) of interbedded layers of gravel and sand, which are tapped by production wells (MWWD, 1996). The primary source of aquifer recharge appears to be the Alamar River, which originates in the coastal San Ysidro Mountains and confluences with the Tijuana River. Other likely sources of recharge are winter rainfall (particularly on undeveloped land north of the border and in Alamar Valley), water line leakage in Tijuana, and discharge from surrounding sedimentary bedrock terraces. Recharge to the alluvial aquifer from the Tijuana River surface flow is more prominent in the U.S. than Mexico, since the Tijuana River is a concrete lined channel from the international border to Rodriguez reservoir. The primary aquifer discharge zone is the Pacific Ocean (USDOE, 2003). Historically, groundwater consumption was related to potable water extraction for export and agricultural use. The high levels of pumping during the 1950s resulted in a lowering of groundwater levels of 23 to 30 feet (7 to 9 meters). By the 1960s, groundwater levels had dropped below sea level, allowing highly saline groundwater and seawater to flow into the water (Recon, 1994). Several factors, including imported irrigation water, reduced pumping due to degraded groundwater quality, and the abandonment of farming activities have contributed to the decline in groundwater usage since 1952 (MWWD, 1996). This has allowed groundwater levels to recover to within 0 to 15 feet (0 to 4.5 meters) of the ground surface (CH2M HILL, 1998). There is currently no known extraction of groundwater from the Tijuana River basin in the U.S. for any purpose except limited agricultural use (MWWD, 1996). Groundwater extraction in the Tijuana River valley north of the international border was 1,500 acre-feet per year (DWR, 2006). Goundwater Quality Currently, the quality of groundwater in the basin is characterized by high levels of total dissolved solids and sodium chloride, which prevents the use of groundwater for salt-sensitive crops. Water quality has been rated generally inferior for domestic use due to high sulfate and fluoride concentrations. In addition, it was rated inferior for irrigation purposes because of high electrical conductivity, high chloride levels, and a high percentage of sodium (Recon, 1994). Table 3-4 shows a summary of water quality data collected by the U.S. Department of Energy for the Groundwater Flow Model for the Tijuana River Basin Project. The following information regarding sources that may alter ground water quality was taken directly from the report prepared by the U.S. Department of Energy titled Conceptual Model for the Tijuana River Aquifer Southwest Border Project dated September 2002. Several factors have attributed to the poor quality of groundwater in the Tijuana River valley, including the following: 3-10
Constituent Units
Table 3-4 Groundwater Data Collected for the Groundwater Flow model for the Tijuana River Basin Project2 Na K Ca Mg Cl SO4 Alk1 DO Fe pH mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L
Sr mg/L
TDS mg/L
Minimum 154 3.04 83.6 25.3 174 135 161 0.47 0.0044 6.79 0.45 858 Concentration Maximum 1940 15.9 486 257 2310 4120 789 5.49 18.7 8.19 3.76 9030 Concentration Average 511.5 7.33 199.9 87.8 768.6 524 416.8 1.96 2.41 7.23 1.62 2413 Concentration Source: USDOE, 2003 1 Alkalinity as mg/L of CaCO 3. 2 Samples collected by DOE personnel at 31 well locations, from IBWC wells in the USA and from municipal water wells in Mexico. Samples collected from Aug 26-30, 2002. Note: Alk = alkalinity; Ca = calcium; Cl = chloride; DO = dissolved oxygen; Fe = Iron; K = potassium; Mg = magnesium; Na = sodium; pH = measure of H+ ions in solution; SO4 = sulfate, TDS = total dissolved solids; Sr = strontium.
Rainfall: In industrial areas such as the Tijuana Basin, rainfall is typically slightly acidic (pH 5.5-6) as a result of sulfide emissions and subsequent oxidation to sulfate. Rainfall probably also contains seawater chemicals from sea spray near the ocean margin. As rainfall infiltrates through the saline soils in the Tijuana Valley, additional salts are dissolved in the groundwater (USDOE, 2002). Tijuana River Recharge: Recharge to the alluvial aquifer from the Tijuana River occurs mostly during high water stages. Although most of the river water recharging the aquifer is relatively low in TDS, it often contains anthropogenic contamination including metals (e.g., copper, lead, and zinc) from industrial effluents and municipal waste (e.g., nitrogen and organic carbon compounds) discharged from the City of Tijuana. Recharge from Tijuana River losses is most prominent in the U.S. because the river is concrete-lined in Mexico (USDOE, 2002). Municipal Discharges: Ground water chemistry in the alluvial aquifer may also be affected by direct recharge from pipes and drains in the City of Tijuana; this recharge is relatively low in dissolved salts, but high in industrial or municipal contaminants. The Colorado River is the main water source for Tijuana, and likely has a TDS concentration of about 500 mg/L (USDOE, 2002). Ocean Water Intrusion: Beneath the Pacific Ocean for a distance of about 1 mile inland from the coast, ground water in the Tijuana alluvium has the composition 3-11
of ocean water (TDS = 34,000). During the 1960s, the alluvial aquifer was pumped at high flow rates, resulting in further intrusion of the ocean water. Similarly, extensive pumping or injection of reclaimed water in the Lower Tijuana River Valley could cause substantial changes in groundwater salinity due to ocean intrusion (USDOE, 2002). Localized Sources: Hydrothermal activity causes additions of hydrogen sulfide and other constituents to groundwater in the San Diego Formation below the Nestor terrace (Izvicki, 1985). Hydrothermal water may locally modify ground water in the alluvium. Recharge from septic systems, leaking storage tanks, and other small sources of water can locally alter ground water composition (USDOE, 2002). Chemical Evolution: Several processes may take place within the aquifer that can modify the chemistry of ground water from its original composition. Dissolved chemicals can be added or removed by precipitation and dissolution of minerals. An example of a process that commonly occurs is the addition of carbon dioxide to infiltrating water caused by plant respiration in the root zone. This process causes pH to decrease which leads to dissolution of carbonate minerals. Ion exchange can alter the ratios of dissolved ions in the ground water. Ion exchange takes place at the surfaces of clay and oxide minerals by exchanging one ion for another. A common example is the exchange of calcium for sodium. Adsorption of metals is another common process that can alter the ground water chemistry (USDOE, 2002).
3.6.1 Vegetation
Vegetation within Tijuana Estuary Portions of the Tijuana River Valley, as it extends west from the international border to the Pacific Ocean support a variety of biological resources. For the most part, the portion of the River Valley located between the international border and Dairy Mart Road is devoid of notable biological resources due to a combination of factors including the channelization of the Tijuana River in the eastern portion of this segment, current 3-12
development, and past and present agricultural and mining activities. Areas west of Dairy Mart Road and north of Monument Road include pockets of dense riparian habitat that support a variety of bird species and are high in habitat value. The subject area is interspersed with agricultural, equestrian, mining, and rural residential uses, but, overall, is still rich in wildlife values. The most notable area of biological resources is the Tijuana Estuary, which extend approximately 3 miles (4.8 km) east from the Pacific Ocean. The Tijuana Estuary is an essential breeding, feeding, and nesting ground, providing an important stopping place on the Pacific Flyway for over 370 bird species (SDSU, 2000). The Tijuana Estuary is part of the National Estuarine Research Reserve (NERR) System and is classified as a Coastal Plain Estuary. Several different habitats occur within the Estuary including, but not limited to, sand dunes and beaches, open tidal channels and mudflats, salt marshes (low, middle, and high); fresh-brackish marshes dominated by bullrushes and cattails, and upland riparian habitats. The Estuary includes cordgrass (Spatina foliosa), pickleweed (Salicornia spp.), saltwort (Batis maritima), shoregrass (Monanthochlo littoralis), and the endangered salt marsh birds beak (Cordylanthus maritmus maritimus). Along the western side of Dairy Mart Road there are several areas of southern cottonwood-willow riparian forest that are known to support breeding habitat for the Least Bells Vireo, a state and federally listed endangered species (MWWD, 1996). Such breeding territory includes the area immediately north of the intersection of Monument Road and Dairy Mart Road. Habitat suitable for infrequent use by the California gnatcatcher (Polioptila californica californica), a federally listed threatened species, occurs south of the intersection of Monument Road and Dairy Mart Road (MWWD, 1996).
3.6.2 Wildlife
Wildlife within Tijuana Estuary The Tijuana estuary also is home to more than 370 species of birds, of which about 320 are migratory, included four federally listed endangered birds: the light-footed clapper rail (Rallus longirostris levipes), the California least tern (Sterna antillarum browni), the least Bells vireo (Vireo bellii pusillus), and the California brown pelican (Pelecanus occidentalis californicus). Occasional visitors include peregrine falcons (Falco peregrinus), bald eagles (Haliaeetus leucocephalus), and golden eagles (Aquila chrysaetos). The Estuary is used for staging and wintering by a variety of waterfowl and shorebirds, with more than 20 species occurring regularly along the sandflats and mudflats. The Estuary also supports a small mammal population, including mice, California ground squirrels and rabbits. At least 20 species of fish reside in the small 3-13
tidal creeks and channels of the estuary, and large populations of crabs, rove beetles, tiger beetles, and wandering skippers can be found as well. Migratory Species According to the Manifestacin de Impacto Ambiental of the Tijuana and Playas de Rosarito Water and Wastewater Master Plan (CDM, 2003), 127 species of birds occur on the Baja Californian peninsula of Mexico, particularly in the general area of the Master Plan. Of these species, all except six are included on the list of migratory birds recognized by the U.S. Migratory Bird Treaty Act (MBTA). Of the 121 species, thirtyseven are listed as threatened or endangered by the U.S. federal Endangered Species Act.
Scientific Name
California Status Endangered None Endangered None Endangered Endangered None None None Endangered None
Rallus longirostris levipes Charadrius alexandrinus nivosus Sterna antillarum browni Polioptila californica californica Vireo bellii pusillus Passerculus sandwichensis beldingi Perognathus longimembris pacificus Branchinecta sandiegonensis Streptocephalus woottoni Eryngium aristulatum var. parishii Ambrosia pumila
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Section 3 Environmental Settings Table 3-5 List if Threatened and Endangered Species in Imperial Beach Quad Deinandra conjugens Otay tarplant Threatened Ornithostaphylos oppositifolia Phacelia stellaris Acanthomintha ilicifolia Pogogyne nudiuscula Navarretia fossalis Rosa minutifolia Cordylanthus maritimus ssp. maritimus Fremontodendron mexicanum Orcuttia californica Orcuttia californica Baja California birdbush Brand's phacelia San Diego thorn-mint Otay Mesa mint spreading navarretia small-leaved rose salt marsh bird's-beak Mexican flannelbush California Orcutt grass California Orcutt grass None Candidate Threatened Endangered Threatened None Endangered Endangered Endangered Endangered
Endangered Endangered None Endangered Endangered None Endangered Endangered Rare Endangered Endangered
3.8 Socioeconomics
The population of the Municipality of Tijuana in 2005 was estimated by INEGI at 1,410,700, and is projected to reach 2,636,594 by the year 2030 (CDM, 2003). Economic activity in Tijuana revolves around the service (or tertiary) sector, mainly commerce and tourism. In 1998, 56 percent of the economically-active population of the area was employed in this sector. In 1998, 18 percent of the people employed in the tertiary sector worked in commercial activities, while 29 percent were employed in tourism (CDM, 2003). The secondary or industrial sector also contributes to the economic activity of the area, although at a smaller level than the tertiary sector. The main activity of this sector is the
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export-oriented industry, commonly referred to as maquiladoras, which has played a major role in the economic growth of Tijuana in recent years. According to the Economic Impacts of Wait Times at the San Diego Baja California Border(SANDAG, 2006) over 60 million people cross the San Diego County Baja California border annually. Approximately half of these trips are for shopping and recreation, while approximately 10 million trips per year are made to and from work. In addition, 730,000 trucks cross this border annually from Mexico. Given the high interrelationship between people in Tijuana and San Diego, public health issues on one side of the border may impact residents on the other side. Improving sanitary and environmental conditions and public health conditions in Tijuana would be beneficial to San Diego County.
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The No Action Alternative includes wastewater treatment plants and associated collection systems that existed in 2007 or are authorized, funded projects. The environmental consequences of the authorized and funded WWTP and collection system projects are considered in the cumulative impacts of the alternatives. Additionally, the analysis recognizes that construction will occur under the No Action Alternative to facilitate development in both the U. S. and Tijuana; however, this construction is not associated with the proposed action to provide wastewater services to the communities in Tijuana. Therefore, construction activities are not considered in the No Action Alternative analysis, but are discussed in the cumulative analysis. Table 4-1 presents a summary of transboundary environmental impacts resulting from the No Action Alternative. It is important to note that the No Action Alternative would have more adverse effects to resources in Tijuana because of the environmental and public health risks associated with inadequate collection, treatment and disposal of wastewater in Tijuana. The following impact discussions focus on resources within the U.S. Because of the shared border, the proposed actions could affect U.S. resources. The following impact discussions focus on resources within the U.S.
Table 4-1 Summary of Impacts to the United States Resulting from the No Action Alternative Air Resources (air quality, noise, odor) Water Resources (surface water, groundwater, water quality) Floodplains Wetlands Biological Resources Cultural Resources Coastal Resources Socioeconomics/Public Health Topography and Geology Cumulative Impacts No Impact Less than significant No Impact No Impact Less than significant No Impact No Impact Less than significant No Impact Less then significant
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and San Diegos Point Loma WWTP, the potential impact of the No Action Alternative on surface water resources and water quality in the U.S. would be less than significant. Groundwater Groundwater may be adversely affected in localized areas in Tijuana near latrines and along surface water courses where untreated wastewater is discharged. In addition, there might be indirect adverse impacts to coastal water resources as a result of groundwater flow to the ocean. Because of the distance of the communities to the U.S. border and the slow-moving nature of groundwater, groundwater resources in the U.S. would not be directly or indirectly affected by the No Action Alternative.
4.1.3 Floodplains
Floodplains in Tijuana or the U.S. would not be affected under this alternative because no construction would take place. There would be no dredging or filling of material within the floodplain limits. The No Action Alternative would not have any direct or indirect impacts to U.S. floodplains.
4.1.4 Wetlands
Wetlands in the U.S. would not be affected by the No Action Alternative. As discussed under Section 4.1.1.2, raw wastewater discharges would likely not have a significant impact on U.S. coastal water, and thus indirect impacts would not be anticipated on wetlands such as the Tijuana River Estuary.
flow, discharges from Tijuana may reach U.S. waters but would experience natural attenuation and dilution given the considerable distance to the border. Therefore, raw wastewater from Tijuana would not indirectly or directly affect coastal vegetation, wildlife, and fish.
regime and contaminants from these coastal Tijuanas raw sewage discharges would not reach U.S. beaches. Therefore, visitation to beaches would not decline as a result of raw sewage discharges from the unserved areas. Section 4.1.2 further discusses impacts to U.S. coastal waters. Environmental justice refers to equitable rights to healthy environmental conditions for poor and minority populations relative to other populations. Most populations in the U.S. rely on an adequate supply of potable water and sanitary disposal and treatment of wastewater for all households. The No Action Alternative would not affect any environmental justice populations in the U.S. The decision to be made on the proposed action is how to provide wastewater service to currently unserved communities in coastal Tijuana, and thus will not affect water and wastewater services to U.S. residents.
Besides, the projects mentioned above, the Rosarito Norte, Rosarito I and Tecolote la Gloria WWTP will discharge into the Pacific Ocean approximately 13.8 mgd (610 l/s) all together by the year 2025. These additional discharges could affect water quality of coastal areas of the U.S.; however, the No Action Alternative would have no contribution to these impacts. Additional wastewater services provided by the Japanese credit plants would improve public health and the general economy of the region under the cumulative condition. Furthermore, the la Morita and Monte de los Olivos WWTP will reduce the inflow in the San Antonio de los Buenos WWTP by approximately 12 mgd (525 L/s) since they will capture the wastewater generated in the Matanuco Norte and El Florido basins, which is currently treated at the SAB and International WWTPs. The No Action Alternative would not include any construction to connect identified communities in Tijuana to the wastewater system. Therefore, it would not contribute to a general improvement in municipal and sanitary services in the project area. The No Action Alternative would not result in any cumulative impacts to the U.S.
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Table 4-2 (Cont.) Summary of Impacts to the United States Resulting from Alternative A Wetlands Biological Resources Cultural Resources Coastal Resources Socioeconomics/Public Health Topography and Geology Cumulative Impacts No Impact Beneficial Impact No Impact No Impact Beneficial Impact No Impact Less than significant
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The construction activities associated with these alternatives are not in close enough proximity for noise levels to exceed U.S. standards. Based on construction equipment mix and activity level associated with construction of general wastewater infrastructure, construction activity noise levels at 50 feet would be approximately 84 dBA for site clearing, 87 dBA for excavation, 83 dBA for construction, and 82 dBA for finishing (MMWD, 1996). Based on standard noise drop-off rate of 6 DB per doubling of distance, the highest noise level (87 dBA for excavation activities) would naturally attenuate to 75 dBA the level recognized by the City of San Diegos Noise Ordinance as the maximum acceptable level for construction noise in residential areas at a distance of 200 feet. This noise level would fall well within the limits of Tijuana and would not result direct or indirect noise impacts within the U.S. During the operational phase, Alternative A would result in a reduction of odors arising from the inadequate disposal of raw wastewater. This alternative would be beneficial to the residents of the unserved areas during the operational phase. However, the odor impact on the U.S. would be negligible because of the substantial distance of the projects.
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4.2.3 Floodplains
Floodplains would not be directly or indirectly affected under Alternative A because no construction would take place in the U.S. No transboundary impacts to floodplains would result from this alternative.
4.2.4 Wetlands
Wetlands in the U.S. would not be directly or indirectly affected by Alternative A due to their substantial distance from the project areas. Effluent discharges by the WWTPs would not affect wetlands in the Tijuana River Estuary. Alternative A would cause no transboundary impacts to wetlands.
through infiltration and inflow. The alternative also would reduce the potential contamination of local water bodies, including the Pacific Ocean and groundwater resources. This alternative would have direct and indirect benefits to the regions economy and public health conditions. Public health in coastal areas of Tijuana would be positively affected by the proposed action because it would reduce exposure to raw sewage in open ditches and contamination of potable water supplies, which are both pertinent health risks. The improvement of sanitary conditions within the coastal Tijuana vicinity would promote better overall public health conditions in the area. The regions economy could improve because workers in Tijuana are healthier, which could lead to more productivity, and the region could attract more tourism because potential health threats to visitors would be reduced. The proposed action could result in indirect transboundary benefits to U.S. public health and the border economy. There are frequent border crossing between the U.S. and the Tijuana region. Public health in the U.S. could improve because U.S. visitors to Tijuana would not be exposed to raw sewage from the unserved areas. The border economy could also indirectly benefit as a result of better overall health conditions in Tijuana. The potential health threat associated with traveling to Tijuana would be reduced and more U.S. residents may choose to cross the border. This could increase economic activity in the border region of the U.S. Environmental justice populations, including low-income populations and minorities, in the U.S. would not be affected by the proposed action. The decision to be made on the proposed action is how to provide wastewater service to currently unserved communities in coastal Tijuana, and thus will not affect water and wastewater services for populations in the U.S.
approximately 13.8 mgd (610 L/s) all together by the year 2025. These additional discharges could affect water quality of coastal areas of the U.S. Additional effluent discharged into the ocean as a result of connecting the coastal communities would not be of sufficient quantity to affect U.S. coastal resources under the cumulative condition. On the other hand the la Morita and Monte de los Olivos WWTP will reduce the inflow to the San Antonio de los Buenos WWTP by approximately 12 mgd (525 L/s) since they will capture the wastewater generated in the Matanuco Norte and El Florido basins, which is currently treated at the SAB and International WWTPs. The Alternative A would provide wastewater services to two additional communities in Tijuana. Therefore, it would further reduce raw wastewater discharges into the environment under the cumulative condition. Water resources and biological resources would improve from better water quality in waterways. Incremental cumulative impacts to the U.S. coast would be less than significant. The border economy could benefit from improved public services and health in the Tijuana region. This could provide small beneficial transboundary impacts to the U.S. under the cumulative condition.
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Section 4 Environmental Consequences Topography and Geology Cumulative Impacts No Impact Less than Significant
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This alternative could improve groundwater resources by reducing the infiltration of raw wastewater into the groundwater basin. These beneficial effects would not likely be realized in the U.S.
4.3.3 Floodplains
Floodplains would not be directly or indirectly affected under Alternative B because no construction would take place in the U.S. No transboundary to floodplains would result from this alternative.
4.3.4 Wetlands
Wetlands in the U.S. would not be directly or indirectly affected by Alternative B due to their substantial distance from the project areas. Effluent discharges by the WWTPs into the Pacific Ocean would not affect wetlands in the Tijuana River Estuary. Alternative B would cause no transboundary impacts to wetlands.
4.3.8 Socioeconomics
Alternative B would eliminate the discharge of raw wastewater to nearby latrines and open ditches, reducing the potential contamination of localized water distribution lines through infiltration and inflow. The alternative also would reduce the potential contamination of local water bodies, including the Pacific Ocean and groundwater resources. This alternative would have direct and indirect benefits to the regions economy and public health conditions. Public health in coastal areas of Tijuana would be positively affected by the proposed action because it would reduce exposure to raw sewage in open ditches and contamination of potable water supplies, which are both pertinent health risks. The improvement of sanitary conditions within the coastal Tijuana vicinity would promote better overall public health conditions in the area. The regions economy could improve because workers in Tijuana are healthier, which could lead to more productivity, and the region could attract more tourism because potential health threats to visitors would be reduced. The proposed action could result in indirect transboundary benefits to U.S. public health and the border economy. There are frequent border crossing between the U.S. and the Tijuana region. Public health in the U.S. could improve because U.S. visitors to Tijuana would not be exposed to raw sewage from the unserved areas. The border economy could also indirectly benefit as a result of better overall health conditions in Tijuana. The potential health threat associated with traveling to Tijuana would be reduced and more U.S. residents may choose to cross the border. This could increase economic activity in the border region of the U.S. Environmental justice populations, including low-income populations and minorities, in the U.S. would not be affected by the proposed action. The decision to be made on the proposed action is how to provide wastewater service to currently unserved communities in coastal Tijuana, and thus will not affect water and wastewater services for populations in the U.S.
waterways and biological resources, by reducing raw wastewater discharges. Additional wastewater services would also improve public health and the general economy of the region under the cumulative condition. CESPT is currently is construction a project that would discharge treated effluent from the Japanese credit plants into the Pacific Ocean off Mexicos coast. Effluent discharge flow from the La Morita and Monte de los Olivos plants into the ocean would be a maximum of 16.7 mgd (733 L/s) by the year 2025. Besides, the projects mentioned above, the Rosarito Norte, Rosarito I and Tecolote la Gloria WWTP will discharge into the Pacific Ocean approximately 13.8 mgd (610 l/s) all together by the year 2025. These additional discharges could affect water quality of coastal areas of the U.S. Additional effluent discharged into the ocean as a result of connecting the coastal community would not be of sufficient quantity to affect U.S. coastal resources under the cumulative condition. On the other hand the la Morita and Monte de los Olivos WWTP will reduce the inflow in the San Antonio de los Buenos WWTP by approximately 12 mgd (525 L/s) since they will capture the wastewater generated in the Matanuco Norte and El Florido basins, which is currently treated at the SAB and International WWTPs . Additional construction would occur in Mexico and in the U.S. in the future to facilitate commercial and residential development, including the construction of other wastewater treatment facilities. These activities could temporarily reduce air quality by dust and exhaust emissions, increase noise levels, and deteriorate water quality by runoff into nearby streams from the construction site. Best Management Practices would be implemented during construction to reduce these effects. Additional development under the cumulative condition would improve Tijuanas economy by generating jobs and more economic activity. A better economy in Tijuana could promote more relations with U.S. businesses and attract more visitors to the region. Cumulative effects to these resources under the No Action Alternative would be less than significant. The Alternative B would provide wastewater services to additional communities in Tijuana. Therefore, it would further reduce raw wastewater discharges into the environment under the cumulative condition. Water resources and biological resources would improve from better water quality in waterways. Incremental cumulative impacts to the U.S. coast would be less than significant. The border economy could benefit from improved public services and health in the Tijuana region. This could provide small beneficial transboundary impacts to the U.S. under the cumulative condition.
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EA EID EIS EO EPA ESA Fe FEMA FIRM FNSI FWCA H+ H2S HC Hr IBC IBEP IBWC in INEGI K km L/s m
Environmental Assessment Environmental Information Document Environmental Impact Statement Executive Order Environmental Protection Agency Endangered Species Act Iron Federal Emergency Management Agency Flood Insurance Rate Map Finding of No Significant Impact Fish and Wildlife Coordination Act Ions in solution Hydrogen Sulfide Hydrocarbons hour International Boundary Commission Integrated Border Environmental Plan International Boundary and Water Commission inches Instituto Nacional de Estadstica Geographa e Informtica Potasium Kilometer Liters per Second Meters
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m3 MBTA Mg mg/l mgd MIA ml ml/l Mm-1 MSCP MWWD Na NAAQS NADB NAFTA NERR NEPA NHPA NO2 NOM NPS O3 Pb pH PM10
Cubic meters Migratory Bird Treaty Act Magnisium Milligrams per liter Million gallons per day Manifestacin de Impacto Ambiental Milliliters Milliliters per liter Inverse megameters Multiple Species Conservation Program Metropolitan Wastewater Department Sodium National Ambient Air Quality Standards North American Development Bank North American Free Trade Agreement National Estuarine Research Reserve National Environmental Policy Act National Historic Preservation Act Nitrogen Dioxide Norma Oficial Mexicana National Park Service Ozone Lead Measure of acidity Particulate matter under 10 microns 5-3
ppm SBIWTP SBOO SDAB SDSU SHPO SO2 SO4 Sr TDS g/m3 US USC USDOE USFWS USIBWC XMS W WA WTP WW WWTPs
Parts per million International Water Treatment Plant South Bay Ocean Outfall San Diego Air Basin San Diego State University State Historic Preservation Officer Sulfur dioxide Sulfate Strontium Total Dissolved Solids Micrograms per cubic meter United States United States Code United States Department of Energy US Fish and Wildlife Service United States International Boundary and Water Commission Transmissivity water alternatives Wilderness Act Water Treatment Plant Wastewater Wastewater Treatment Plants
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No Comments Provided
No Comments Provided The development of the projects would help protect and improve conditions along the coast.
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Section 7
References
Section 7 References
California Department of Fish and Game 2006. California Natural Diversity Database Quick Viewer. Imperial Quad. Available at: http://www.dfg.ca.gov/bdb/html/cnddb.htm California Department of Water Resource. 2006. Groundwater Bulletin 118 Tijuana Groundwater Basin. Last update 1/20/06. CARB(California Air Resources Board). 2005. Ambient Air Quality Standards). http://www.arb.ca.gov.aqs/aaqs2.pdf CARB. 2005. Area Designation Maps/State and National. http://www.arb.ca.gov/desig/adm/adm.htm CDM. 2003. Effluent Discharge and Dispersion through the South Bay Ocean Outfall, Environmental Review and Analysis for the Tijuana and Playas de Rosarito Water and Wastewater Master Plan. For the U.S. Environmental Protection Agency. CH2M HILL, 1998. Supplemental Environmental Impact Statement for the International Boundary Commission South Bay International Wastewater Treatment Plant Long Term Options. Volume 1. For the International Boundary and Water Commission (United States Section) and U.S. Environmental Protection Agency. City of San Diego. 2002. Annual Receiving Waters Monitoring Report for the South Bay Ocean Outfall (2001). Prepared for the International Boundary and Water Commission City of San Diego. 2004. Monthly Receiving Waters Monitoring Report for the South Bay Ocean Outfall. Prepared for the International Boundary and Water Commission City of San Diego Metropolitan Wastewater Department. 1996. South Bay Water Reclamation Plant and Dairy Mart Road and Bridge Improvements EIR/EA. County of San Diego Department of Environmental Health, 2006. Beach Closure and Advisory report. http://www.sdcounty.ca.gov/deh/lwq/beachbay/pdf/2005_bcr_appendix_a.pdf Dudek 1994. Groundwater Management Plan for the Tijuana River Basin, prepared for Tia Juana Valley County Water District by Dudek & Associates, October. Ocean Imaging. 2002. Satellite and Aerial Coastal Water Quality Monitoring in San Diego/Tijuana Region. October 11, 2002. Pages 16, 18. 7-1
Section 7 References
Recon, 1994. Final Environmental Impact Statement for the International Boundary and Water Commission International Wastewater Treatment Plant and Outfall Facilities, Volume 1. For the International Boundary and Water Commission (United States Section) and U.S. Environmental Protection Agency. SANDAG (San Diego Council of Governments). 2006. Economic Impacts of Wait Times at the San Diego Baja California Border. http://www.co.imperial.ca.us/IVAG/ProjectBriefs/2007-20ImperialCountyTransPlan /San%20Diego_Tijuana%20Study.pdf SDSU (San Diego State University) Institute for Regional Studies of the Californias San Diego-Tijuana International Area Planning Atlas. 2000. ISBN 0-925613-29-0. http://www-rohan.sdsu.edu/~irsc/atlas/atlsdesc.htm USDOE (United States Department of Energy). 2003. Southwest Border Project Ground Water Flow Model for the Tijuana River Basin. GJO-2003-408-TAC OP 13.3-2. USDOE (United States Department of Energy). 2002. Conceptual Model for the Tijuana River Aquifer Southwest Border Projects. GJO-2002-367-TAC OP 13.3-1.
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Appendix A
International Agreements
The BECC BEIF Environmental Assessment Guidelines identify and describe the following five major bilateral agreements between Mexico and the U.S. related to environmental protection:
The 1889 International Boundary Convention The Water Treaty of 1944 The 1983 La Paz Agreement (or Border Environmental Agreement) The 1992 Integrated Border Environmental Plan (IBEP) The 1994 North American Free Trade Agreement (NAFTA)
The 1889 International Boundary Convention established the International Boundary Commission (IBC). The Water Treaty of 1944 replaced the IBC with the International Boundary and Water Commission (IBWC) and granted the U.S. Section of the IBWC enhanced authority to address water quality, conservation, and use issues within the U.S. All international border and water treaties with respect to Mexico are coordinated through the IBWC. The IBWC was created by the governments of the U.S. and Mexico to apply the provisions of various border and water treaties and settle differences arising from such applications through a joint international commission. IBWC coordinates the exchange of information between the U.S. and Mexico for all program activities that involve watersheds or aquifers crossing into Mexico. The IBWC jurisdiction extends along the U.S./Mexico International Border, and inland into both countries where international border and water projects may exist. The IBWC has encouraged and coordinated the establishment of cooperative relationships with federal, state, and local agencies, both in the U.S. and Mexico, in carrying out its border projects and activities. The 1944 Treaty also specifies the way in which water rights of the Rio Grande, from Fort Quitman in Texas to the Gulf of Mexico, are allotted. In summary, the Treaty states that all of the water reaching the Rio Grande from the San Juan and Alamo Rivers belongs to Mexico, as wells as two thirds of the flow from the Conchos, San Diego, San Rodrigo, Escondido, and Salado rivers and Las Vacas Arroyo. Flows not-allotted by the treaty are equally owned by both countries. The Agreement for the Protection and Improvement of the Environment in the Border Area, known as La Paz Agreement, was signed in 1983. The main objective of the Agreement is to protect, improve, and conserve the environment of the border area. The La Paz Agreement defines the border region as the area lying 100 km (62 miles) to the north and south of the U.S./Mexico International Border. In 1992, the IBEP was A-1
released, and building on this, the Border XXI Program increased the scope of concern to include environmental health and natural resources issues. As part of NAFTA, a bilateral agreement was signed to address the deficiencies in water and wastewater infrastructure in the border area. A second environmental agreement negotiated to augment NAFTA is the 1994 U.S./Mexico Agreement Concerning the Establishment of a BECC and a NADB (BECC-NADB Agreement). The BECC-NADB Agreement targets certain environmental problems in the border region to remedy international border environmental or health problems. The BEIF was created by NADB and EPA to make environmental infrastructure projects affordable for communities throughout the U.S./Mexico border region by combining grant funds with loans or guaranties for projects that would otherwise be financially unfeasible.
Lmites Mximos Permisibles de Emisiones para Vehculos con Gasolina, or Maximum Permissible Emission Limits for Vehicles Using Gasoline (NOM-041-SEMARNAT 1999) Lmites Mximos Permisibles de Emisiones para Vehculos con Diesel, or Maximum Permissible Emission Limits for Vehicles Using Diesel (NOM-045-SEMARNAT 1996) Lmites Mximos Permisibles de Emisin de Ruido de Vehculos Automotores, or Maximum Permissible Emission Limits for Noise from Motor Vehicles (NOM-080 SEMARNAT-1994) Emisiones de Ruido de Fuentes Fijas, or Noise Emissions from Fixed Sources (NOM 081-SEMARNAT-1994) A-3
Limites Mximos Permisibles de Contaminantes en las Descargas de Aguas Residuales en Aguas y Bienes Nacionales, or Maximum Permissible Limits of Contaminants in Wastewater Discharges into National Waters and Natural Resources (NOM-001-SEMARNAT-1996) Lmites Mximos Permisibles de Contaminantes Para las Aguas Residuales Tratadas que se Reusen en Servicios al Pblico, or Maximum Permissible Limits of Contaminants for Treated Wastewaters that are Reused in Services to the Public (NOM-003-SEMARNAT-1997) Lmites Permisibles de Calidad y Tratamiento a que Debe Someterse el Agua Para su Potabilizacin, or Permissible Quality and Treatment Limits for Potable Water (NOM-127-SSA1-1994) Vigilancia y Evaluacin del Control de Calidad del Agua Para Uso y Consumo Humano Distribuida por Sistemas de Abastecimiento Pblico, or Monitoring and Evaluation of Quality Control of Water for Human Use and Consumption through Public Supply Systems (NOM-179-SSA1 1998) Requisitos Sanitarios que Deben Cumplir los Sistemas de Abastecimiento de Agua para Uso y Consumo Humano Pblicos y Privados, or Sanitary Requirements to Which Public and Private Water Supply Systems for Human Use and Consumption Must Comply (NOM-012-SSA1 1993)
A-4
The law prohibits any action, administrative or real, that results in a "taking" of a listed species, or adversely affects habitat. Likewise, import, export, interstate, and foreign commerce of listed species are all prohibited. In the context of this study, the ESA must be observed for any potential impacts to terrestrial habitat in the U.S. resulting from construction activities, as well as impacts to aquatic habitat resulting from changes in water quality.
carried out as part of a formal consultation with the SHPO, the ACHP, and other parties, such as Indian tribes, that have knowledge of, or a particular interest in, historic resources in the area of the undertaking. Wetlands Protection - EO 11990, Protection of Wetlands of 1977, requires federal agencies conducting certain activities to avoid, to the extent possible, adverse impacts associated with the destruction or loss of wetlands and to avoid support of new construction in wetlands, if a practicable alternative exists. Discharge of dredge or fill material into wetlands and other waters of the U.S. are also regulated under Section 404 of the Clean Water Act. Floodplain Management - EO 11988, Floodplain Management of 1977, requires federal agencies to evaluate the potential effects of actions they may take in a floodplain to avoid, to the extent possible, any adverse effects associated with the direct and indirect development of a floodplain. Coastal Zone Management Act - The Coastal Zone Management Act, 16 USC 1451 et seq., requires that federal agencies in coastal areas be consistent with approved State Coastal Zone Management Programs, to the maximum extent possible. If an EPA action may affect a coastal zone area, the responsible official is required to assess the impact of the action on the coastal zone. Fish and Wildlife Protection - The Fish and Wildlife Coordination Act, 16 USC 661 et seq., requires federal agencies involved in actions that will result in the control or structural modification of any natural stream or body of water for any purpose, to take action to protect the fish and wildlife resources that may be affected by the action. Wilderness Protection - The Wilderness Act, 16 USC 1131 et seq., establishes a system of National Wilderness Areas. The act establishes a policy for protecting this system by generally prohibiting motorized equipment, structures, installations, roads, commercial enterprises, aircraft landings, and mechanical transport. Otay Mountain Wilderness, designated in 1999, is the nearest wilderness site to the study area. Environmental Justice - EO 12898, Federal Actions to Address Environmental Justice in Minority Populations and Low-Income Populations, and the accompanying presidential memorandum, advise federal agencies to identify and address, whenever feasible, disproportionately high and adverse human health or environmental effects on minority communities and/or low-income communities.
A-6
Appendix B
B-1
B-2
B-3