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HomeMy WebLinkAboutCT 01-09; LA COSTA TOWN SQUARE; ADDENDUM TO THE FINAL ENVIRONMENTAL IMPACT REPORT; 2000-03-01, e- ADDENDUM TO THE .. ,QO-IO)~:-I? c~ O(~01' t>vJ~ <1 O!f-{ f> FINAL ENVIRONMENTAL IMPACT REPORT' FOR THE RANCHO SANTA FE ROAD }U:ALIGNMENT AND MASS GRADING seH # 90010850 " Prepared by: CITY OF CARLSBAD , 1635 Faraday Avenue Carlsb'adt California 92009 ' cr OJ-O~ (1. r '· "I .. 'r ABLE OF CONTENTS Section Page No. 1.0 INTRODUCTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 1-1 1.1 Purpose of the Addendum. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 1-1 1.2 Content and Format of the Addendum ...................... , .... ' 1-2 2.0 PROJBCT DBSCRIPTION ........................................ 2-1 2.1 Purpose ...... ~ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 2-1 2.2 Location and Setting .: ...... '. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 2-1 2.3 Project Characteristics .... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 2-1 2.3.1 Phase 1 and 2: Roadway Realignment. . . . . . . . . . . . . . . . . . . .. 2-3 2.3',2 Phase 2: Bridge Improvements .............. .-.......... " 2-5 2.3.3 Project Construction ...................... , ........... " 2-5 2.4 Measures Included to Avoid Environmental Impacts ............... 2-6 3.0 DBTBRMINATION ....... , ...................................... 3-1 4.0 RATIONALB .................................................. " 4-1' 4.1 Air Quality ..................... ' ................... ' ...... .' " 4-2 4.2 Earth Resources .............................................. '4-2 4.3 Water Resources .............. : . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 4-H 4.4 Biological Resources . . . . . . . . . . .... . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 4~4 4.5 Noise ............................. ' ....................... " 4-6' 4.6 Light and Glare ...................... : ..................... " 4-7, 4.7 Land Use. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 4-7 4.8 Public Service ............................................... 4-8 4.9 Utilities .................................................. " 4-8 4.10 Landform Alteration/Visual Quality ........................... '.. 4-8 4.,11 Cultural/Historic Resources ................................... 4-9 4.12 Traffic/Circulation............................................ 4-9' 4.13 Cumulative Effects ......................................... 4-10 4.14 Growth Inducement ........................................ 4-10 ~.:-&o1IWlI March 2000 1576-17 ~~------------------------~~---­;~~;~ Final EIR Ad~endum • Rancho Santa Fe Road Realignment and Bridge Replacement .. 'I'ABLE OF CONTENTS Section Page No. 5.0 MITIGATION, MONITORING AND RBPORTING PROGRAM (MMRP) . ' .... ' .. ' .......................... 5-1 ,6.0 RBFBRENCES. .... .. ........ ............................ .... .... 6-1 LIST OF FIGURES Figure 1 Figure 2 Limits of GradingIVicinity Map ............................ . . .. 2-2 Final Alignment ..................... : ...................... '. 2-4 '"J_o It., iiiiiMa;;;rchiiiii2oiiiiiiooiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii15iiiii76iiiiii"17 ,&.ASSOCIATES. INC-,- P~'1bmv/ .. C-pluP"I"" Rnal EIR Addendum. Rancho Santa Fe Road Realignment and Bridge Replacement II . ... . .. ~-. . -, ..... _---........ _"'_._._---. ~ ... -.-._.-...... _._ ...... _'.--_ ..... _._._-... _.-... _.-.. _-_._, ... -..-... --.-.. ... ~ tl U o ~ I "j ( ... . . .- SECTION 1.0 INTRODUCTION 1.1 Purpose of the Addendum In 1992, the City of Carlsbad (the City) approved the preliminary alignm~nt for the Rancho Santa Fe Road Realignment and Mass Grading project. Approval of the project was based on the certified Final Environmental 1m pact Report (EIR)--Rancho Santa Fe Road Realignment and Mass Grading (SCH #90010850) dated April 3, 1992. This EIR is available for review at the City of Carlsbad. . The 'City project approved in 1992 provided ~or realignment and construction of Rancho ~anta Fe Road and mass grading of 448 acres within an area in eastern Carlsbad. The project evaluated in the EIR addressed relocation of existing Rancho Santa Fe Road eC!.sterly to what . was referred to as the llCanyon Alignment," replacing the bridge over San Marcos Creek, and expansion of.the road into a six-lane arterial between La Costa Avenue and Melrose Drive as called fbr in the Circulation Element of the City's General Plan. The project evaluated in the EIR set the preliminary alignment and limits of grading for the roadway and bridge replacement .. The City has now completed Final Alignment Studies for the roadway realignment as well as the bridge replacement which differ slightly from the preliminary alignment and bridge replacement evaluated in the EIR. The City de~ires to document the Final Alignment Studies for the roadway realignment and bridge replacem~nt. This Addendum fulfills this need and conforms to the provisions of the 'California, Environmental Quality Act (CEOA) and CEOA Guidelines, ~ecti0l?-15164, providing for the , preparation of an Addendum. The CEOA Guidelines allow the preparation of an Addendum to an EIR under the following circumstances: 1. 2. 3. Only minor technical changes or additions are necessary to make the'EIR under consideration adequate; The changes and additions to the EIR do not raise important new issues about significant effects on the environment; and None of the cond~tions described in Section 15162, CEOA Guidelines, calling for the ,preparation of a subsequent EIR have occurred. ~~"'I March 2000 1576-17 ~~~~~~-Fln-ru-EI-RA-d-de-nd-um-+-R-a-nc-ho-sa-~-F-e-RO-ad-'R-ea-lig-nm-en-ta-nd-M-~-S-Gr-ad-lng--------~--------1--1 \ ............ _ .................................................... .. _ .... -., ... -.. -..... -.. -.... . _ ... .,. ..-........ -.. ~ .. _ ... _, -.. ~ .. " .. -..... ",-......... ~.~-.. -........ " -... " '" ~.-~ ., .... ~" .... -... ~,-.~ ......... -.-""" ...... ,.-.-.. ... -,~., ..... -. .: .-. ....... , ...... , .. " " --Section 1.0 I ntrod uction -1.2 Content and Format -of the Addendum This addendum includes the following: Section 1.0, Introduction: Provides an Introduction to and purpose of the Addendum. Section 2.0, Project Description: Provides a description of the proposed Final Alignment Studies for the roadway realignment as well as the ·bridge replacement. Section :to, Determination: CECA Guidelines Sections 15162 through 15164 set forth the criteria for determining the appropriate environmental documentation, if any, to be .completed when there is a pre-existing adopted EIR covering the project. This section addresses the criteria provided in CEOA GUidelines, Section 15162(a) and 15163, and provides a conclusion statement as to the basis for preparing an Addendum to the existing Final EIR pursuant to CEOA Guidelines .Section 15164. Section 4.0, Rationale: This section addresses environmental resource areas. and provides. discussion as to why the proposed project would not ·create new significant impacts or increase the severity of impacts identified for environmental issues addressed in the certified Final EIR. The following resource areas are addressed: Air Qvality, Earth .Resources, Water Resources, Biological Resources, Noise, Light and Glare, Land Use, Public Servic~s, Utilities, Landform Alteration /Visual QUfllity, Cultural/Historic Resources, Traffic/Circulation, Cumulative Impacts and Growth Inducement. . Section 5.0, Mitigation Monitoring and Reporting Program Incorporated into the Project: This section presents mitigation measures presented in. the Final EIR that are . necessary to accommodate the project changes addressed in this Ad4endum. Technical Studies: The following separate technical studies have been prepared for the Final . Alignment Studies for the roadway alignment as well as the bridge replacement: • Agra Environmental, 1998. Geotechncial Study. • Dudek & Associates, March 24, 1997. Water Quality Study Rancho Santa Fe Bridge Replacement Project. • Dudek & Associates, March 25, 1997. Visua/Asses~ment of Rancho Santa Fe Road Bridge Replacement. ill"lIiI:I~Ma_ro_h2_oo_o ______________________________________ ~1_57_~1_7. i;ASSOCIATES. IN~ _ 1''''f .. d ... IT'''''''forc",~''''P",I_ Anal EIR Addendum. Rancho Santa Fe Road Realignment and Mass Grading 1·2 ,-Section 1.0 Introduction • Dudek & Associates, April 7, 1997. Phase 1 Environmental Assessment Rancho Santa Fe Bridge Replacement. • Dudek & Associates, January 12,2000. Floodplain Evaluation Report Rancho Santa Fe Bridge Replacement Project. • Dudek & Associates, January, 2000. Acoustical Assessment Report Rancho Santa Fe Bridge Replacem'ent Project. • Dudek & Associates"February, 2000. Biological Resources Report for Rancho Santa, Fe Roadway Realignment and Bridge Replacement Project. • Gallegos & Associates, February, 2000. Cultural Resources Report, for Rancho , Santa Fe Roadway Realigntnent t}nd Bridge Replacement Project. These technical studies are incorporated into this Addendum by reference and are available for review at the City. March 2000 1576-17 ~~~~~;; Flnal EIR Addendum. Rancho Santa Fe Road Realignment and Mass Grading 1-3 _ ..... ~._._.w ...... ,,~_ .. _ ..... ~~_"""" _ ....... _ .. " .. ___ ............ , .. __ . . ___ . _ _',. ,._. 2 .. 1 Purp~se - SECTION 2.0 PROJECT DESCRIPTION As discussed in the EIR, the proposed roadway realignment, widening and bridge replacement improvements are necessary to implement the transportation requirements of the City of Carlsbad General Plan. Community benefits from this project will include reduced congestion, improved traffic flow and increased safety for travelers on the roadway. Additionally, this road realignment will provide a vital link in the regions roadway network. Increasing the capacity of the roadway would bring levels of service at intersec~ions in the project vicinity to acceptable levels and improve air quality by reducing traffic congestion. The project will also involve replacement of the existing bridge over San Marcos Creekwhich is currently ,hydraulically inadequate and cannot pass the lOO-year storm without becoming submerged .. 2.2 Location and Setting Rancho Sant~ Fe Road w.ould be widened and realigned from two lanes to an ultimate six lane prime arterial roadway from approximately 100 feet south of the La Costa Avenue/ . Rancho Santa Fe Road intersection to approximately 100 feet north of the Melrose Drive/Rancho Santa Fe Road within the City of Carlsbad. Figure 1 illustrates the preiiminary alignment evaluated in the EIR and the Final Alignment evaluat.ed in this Addendum. As illustrated in Figure 1, the Final Alignment Studies B:nd associated limits of grading for the roadway realignment as well as bridge replacement are substantially in conformance with the preliminary alignment and bridge replacement evaluated in the EIR. 2.3 Project Characteristics The City intends to construct the project in two phases: Phase 1 will consist of the realignment of Rancho Santa Fe Road south of the San Marcos Bridge crossing. Phase 2 will consist of the bridge replacement and intersection improvements north of the bridge. As a part of the FinalAlignment Studies, the roadway would be widened at the locations anticipated in the EIR and no substantial changes to the preliminary alignment or permanent limits of grading are proposed as a part of the Final Alignment Studies. DUDEK March 2000 1576-17 &MSOC~TEsmc. ______________________________________________ ~ ____ ~ l'nIflUinMIT_[m"CoIllf>lr.<l'n>frd.! Anal EIR Addendum +Rancho Santa Fe Road Realignment and Bridge Replacement 2"-1 BASE MAP SOURCE:.USGS 7.5 Minute Series, Rancho Santa Fe Quadrangle ~'-'-'-' :::.Ll_.:.LJ~~~~ 1" -2000' Rancho Santa Fe Road Realignment and Mass Grading· EIR Addendum I F1GUR~ I Limits of Grading I Vicinity Map 1 .' . '" Section 2.0 --' Project Description The Final Alignment Studies configuration illustrated in Figure 1 represents a refinement of the preliminary alignment to accommodate specific grading and alignment design developed for the Final Alignment Studies. As a result, some'minor modifications to the arec;i of disturbance from that addressed in the EIR to ac~ommodate temporary construction activities, and improvements to existing roads are necessary to implement the Final Alignment Studies. As shown in Figure 1, the Final Alignment Studies extend beyond the limits of grading identified iii the EIR at the Melrose Drive/Rancho Santa Fe Road intersection as' well as the southeastern border south of Ouesthaven. The Final Alignment Studies also incorporate some roadway work soutP. of the Rancho Sant,a Fe Road/La Costa Avenue intersection, Ouesthaven Road and La Costa Meadows Avenue that is not covered by the EIR. The area of disturbance' in the vicinity of the Melrose/Rancho Santa Fe intersection from that identified in the EI~ is neces~ary to accommodate temporary con'struction staging areas, further. refine the location of the Melrose/Rancho Santa Fe Road intersection as required by the EIR, as well as provide a connection with the Rancho Santa Fe Road alignment and widening to ~e built by the City of San Marcos. Work t? be completed south of the La Costa Avenue/Rancho Santa Fe Road intersection would consist of connection with the previously widened portions of Rancho Santa Fe Road and woulcl not represent an expansion of the capacity of the roadway from that anticipated in the EIR. The increase in the limits of grading for Ouesthaven Road and La CbSta Meadows Avenue is necessary to accommodate turning lanes at the intersections with Rancho Santa Fe Road and no increase to the capacity or alignment of these roadways is proposed. 2;3.1 Phase 1 and 2: Roadway B~alignment As shown in Figure 2, the Final Alignment Studies include specifics ~egarding grading including location and size of manufactured slopes. The realigned Rancho Santa Fe Road ' would be constructed to the full width on the east side of the median, with Sidewalks, curb' and gutte!, and street lights from the bridge to,Melrose Drive. The west side of the roadway will be constructed with 32 feet of paving adjacent to the median curb. The Final Alignment Studies also include drainage facilities and drainage outlets to be constructed as ,a part of the project. As shown in Figures 1 and 2, the Final Alignment Studies also include a configuration and specific grading plans for the Melrose Drive/Rancho Santa Fe Road intersection. The EIR required that the City finalize this intersection configuration prior to construction. As shown in Figure 1, the ~nal alignment intersection configuration conforms With the preliminary alignment anticipated by the City as a part of the EIR. March 2000 1576-1Z Prof_··ITtII ... /orc. .. pltJePtojtrJJ Final EIR Addendum +Rancho Santa Fe Road Realignment and B~dge Replacement 2-3 -:; ~~ .... .:. -, _. J 7 t •• ___ -.A .1 :~ .C.", __ ._J ~ } I.... __ • ... ~I t .!..- , ,f • ~ o 750 , : , Scat. In Feet . Rancho Santa Fe Road Realignment and Mass Grading· EIR Addpndum I EXHIBITI Final Alignment 2 ~w [J o o c] ; -ji, , r \~", Cl o I ~~ -~~ l'ti' (./" ~"<:!I" o [J J j J J Section 2.0 Project Description 2.3.2 Phase 2: Bridge Improvements The EIR identified the location and limits of grading for replacement of the bridge over San Marcos Creek. The proposed final alignment bridge replacement would conform with 'the location and limits of grading evaluated in the 1992 EIR. The Final Alignment Studies provide details necessary to construct the bridge replacement that were not identified in the preliminary alignment evaluated in the 1992 EIR. As shown in Figure 2, under the final alignment, the bridge would consist of six lanes; The span over San Marcos Creek would extend for approximately 375 feet and would range in height from 15 to 20 feet from the creek bottom to the bottom of the bridge. The bridge would be supported by manufactured fill slopes at the northern and southern termini of the bridge. A total C?f twelve piers would support the bridge span. Each pier woul~ be constructed by excavating a pit and using driven iron piers to form and cast each individual concrete pier. Following construction of the piers, the excavation area would be rerilled and returned to original grade. Each pier would include 4'x61 columns and 12'x12' footings. 2.3.3 Pro,iect Construction The EIR identified construction activities necessary to complete grading for the roadway. The EIR identified construction staging areas as well as locations for blasting operations. Construction activities and equipment for the Final Alignment Studies would conform with that anticipated by the EIR. As required by the EIR, the proposed earthwork will be balanced between cut and fill. The quantity of dirt and rocked moved within the project construction area would not exceed that evaluated by the EIR. Staging and blasting areas-anticipated to . be used during construction are included in the limits of grading shown in Figure J, and ate consistent with that anticipated by the EIR. Construction of the project is scheduled to begin in 2001 fiscal year. Construction activities will begin with Phase 1 portion of the project. Construction of Phase 1 will take approximately eighteen months. Construction of the Phase 2 portion of the project -is expected to begin in 2002 and will take approximately 18 months. As required in the EIR, in association with completion of Phases 1 and 2 segments-of the realigned roadway, those portions of the existing Rancho Santa-Fe Road that are no longer required as roads will be vacated. Figures 1 and 2 illustrate the roadway removal that will occur during construction. As shown in Figure 1, the area of roadway to be vacated conforms with that evaluated in the EIR. March 2000 1576·17 ~-T!lmsjarCorof1lal'nlj«JJ Rnal EIR Addendum +Rancho Santa Fe Road Realignment and Bridge Replacement 2·5 [j. [l [~l ~S\~~ [l [j I c,J a I, ~~; , . ] J ] ] J Section 2.0 Project Descri,ption 2.4 Measures Included to Avoid Environmental Impacts The City has incorporated as part of its proposed Fina~ Alignment Studies a number of measures to reduce or avoid potential environmental impacts as'sociated with construction and operations of the proposed project. All measures required for the roadway by the EIR as well as measures recommended by subsequent technical studies have been incorporated into the project design. These measures are considered part of the project and are summarized below: Air Quality Measures incorporated into the project to minimize project-related impact to air qualitY associated with construction include: • Using adequate water and/or other dust palliatives on all disturbed areas. • Washing do~n or sweeping streets from which construction access is taken to remove dirt carried from the ne~ alignment ~o the existing roadway to keep vehicles from pulverizing the dirt into fine particles. .' Terminating soil excavation, clearing or grading when wind speeds exceed 25 mph for an hourly average. . •. Covering/tarping all vehicles hauling dirt o~ spoils ~n public roadways unless aqditional moisture is added to prevent material blow-off during transport. • Requiring low-NOx-emission tuneups for all ,on-site construction equipment at a minimum of every ninety (90) days. • 'Providing rideshare incentives for construction personnel. • Minimizing obstruction of through traffic lanes from construction equipment or activities. • Prohibiting engine idling while waiting to load or unlo.ad if the expected wait exceeds ten (10) minutes. • Scheduling partial or full street closures to off-peak traffic hours. • The Contractor will perform street sweeping should silt' be carried ove]:' to adjacent public thoroughfares. DUDEK March 2000-1576-17 &ABSOC~TES,mc. ________________________________________________ =-____ _ ~T-Jor~1'n1jtdI Final EIR Addendum +Rancho Santa Fe Road Realignment and Bridge Replacement 2·g [l (1 'r :~ Vi :~ I'~" [] [j [-~ ~'Qj a I. [TI [~ II 4,' fiJi '"'II & J J -:'/ .,' Section 2.0 Project Description • During construction, the City will require the contractor to: use wa ter trucks or sprinkler systems to keep all areas where vehicles move damp enough to prevent dust raised when leaving the site; wet down areas in the late morning and after work is completed for the day; and use low sulfur fuel (0.5% by weight) for construction equipment • Bikeways, will be pr,?vided along Rancho Santa Fe Road as required by City standards; if required by the North County Transit District, bus shelters and benches and street pockets will be installed on Rancho Santa Fe Road; bicycle storage facilities will be provid.ed at any park and 'ride sites as required by Caltrans. Earth Resources • All improvements proposed in the Final Alignment Studies comply with the City grading ordinance and incorporate·all requirements 9f,the geotechnical analysis included as Appendix C of the EIR. , • Measures required by supplemeJ;ltal Agra Envirop.mental geotechnical. reports (1998) to avoid geotechnical hazards such as soil instability1 erosion or dam instability from blasting will be incorporated into the design of the Final Alignment Studies. • The c~ntractor will u'tilize straw1 hydro seeding, mulching, or other'suitable materials or techniques during construction activities to reduce the erosion· potential for uncovered soils. • The contractor will install temporary culverts, ditches, ~atchment basins, and se~tling ponds where needed during construction to collect excess Water and sediments Garried from the construction site. Sediments collected will be disposed of onsite, unless contamination of sediment with hazardous material occurs, which would require disposal at a Class II or Class III disposal site. DUDEK March 2000 1576-17 &ASSOC~Strnc. __________________________________________ ~ ______ ~ __ - ,Ptoftssi-/T,.ruforOJ"",""l'<Djtds Anal EIR Addendum +Rancho Santa Fe Road'Realignmentand Bridge Replacement 2-7 [] [] I fiJ ~ I o [1 [1 [' i o [1 Section 2.0 Project D,escription Water Resources • All erosion control measures required by the City Grading ordinance for roadways 'will be incorporated into the project design; • Project design will ensure that no additional runoff will drain into Stanley Mahr Reservoir • • • • • All refuse generated during grading will be contained and removed Construction Phas.e: During the construction phase, BMPs will be applied to control storm water runoff and to provide dust control. These measures include: Gravel berms, filter fabric fences,lines of straw bales, to prevent erosion Surfacing of roadways will occur as soon as possible Periodic watering of areas to keep dust down Prompt revegetati0Il: of surrounding areas to prevent erosion The Stormwater Pollution Prevention Plan (SWPPP) as identified in the construction activity permit from the RWOCB will be implemented and followed. T 6 minunize water quality degradation by sedimentation of the river chamiel during construction, construction of the neW bridge piers and demolition of existing piers will be limited to the dry season (March to October). Operational Phase: The roadway design inc1t:Ides devices for storm water treatment These devices capture and treat the st9rm water prior to discharge to San Marcos Creek. BMPs will also be applied to reduce pollutant loads to San Marcos Creek. These BMP's will include use of rip-rap at stormdrain outlets to reduce the velocity of runoff. The City will folJ.ow all recommendations made pertaining to erosion control in the geotechnical evaluation by Geocon, Inc., the City of Carlsbad's Grading Ordinance, and Landscape Manual. When feasible, hauling by the developer will be accomplished in a manner that minimizes the spillage of soil onto roads in developed areas. DUDEK March 2000 1 ~76-17 &ASSOCIATES, INC. iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii;;;;;;;;iiiii ~T ... forC."",""l'<oJ«U Anal EIR Addendum +Rancho Santa Fe Road Realignment and Bridge Replacement 2-8 Section 2.0 Project Description • Refuse material such as oil, grease, and broken equipment generated during grading will be property contained and removed offsite to a disposal site. Biological Resources • The City is currently in the process of obtaining the necessary permits for wetland impacts. These permits include a Nationwide Permit in accordance with Section 404 of the Clean Water Act from the Army Corps of Engineers (ACOE), a Section 1600 Streambed Alteration Agreement from the California Department of Fish and Game (CDFG), and a Water Quality Certification from the Regional Wa.ter Quality Control Board (RWQCB) in accordance with Section 401 of the Clean Water Act .. These permits will be obtained priOl: to implementation of grading. • The new bridge and abutments have been designed to avoid and minimize impacts to jurisdictional wetlands and wa t~r of the United States to the extent feasible. Project impacts to southern willow scrub wetlands and unvegetated stream channel will be minimized as follows: For impacts to wetlands habitats, the projec.t will include habitat creation; restoration, e~ancement or acquisition pursuant to permit·, .requirements of the ACOE and CDFG. The following ratios are included in the project for perman~nt impacts: for unvegetated stream channels, 1:1; for southern willow scrub, 8:1.-Following demolition of the old bridge over San Marcos Creek, this area will be restored to . support southern willow scrub habitat. Following temporary impacts' necessary to construct the new bridge, pre-construction contours will be restored and those areas that will support vegetation will be revegetated with riparian plants. • For permanent impacts to upland habitats associated with the roadway realignment, the City has purchased habitat credits in conformance with the 1996 Fieldstone Habitat Conservation Plan(HCP). The City has contributed approximately' 2 million dollars to the purchase of mitigation property identified as a part of the HCP for impacts associa~ed with realignmerttof the roadway. March 2000 1576·17 &ASSOCIATES, INC. iiiiiiiiiiiiiiiiiiiiiiOiiiiiiiOiiiiiiiOiiiiiiiOiiiiiiiOiiiiiiiOiiiiiiiOiiiiiiiiiiiiiiiOiiiiiiiOiiiiiiiOiiiiiiiiiiiiiiiiiiiiiiiOiiiiiiiOiiiiiiiiiiiiiiiiiiiiiiiOiiiiiiiOiiiiiiiOiiiOiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii DUDEK l''''fiss-musforCorof>'"I'tDjtctt Anal EIR Addendum +Rancho Santa Fe Road Realignment and Bridge Replacement 2·9 . [1- [~ [~ \\:.\t.J. [J [1 [~ ~4 o ~~f (" c. , , [] o I ~n tI ~ ~r o o o 1-_i --1 J Section 2.0 Project Description • Vegetation removal that is needed to accomplish the project will be conducted between 15 September and 15 February immediately prior to construction. • All work will be conducted during the daytime hours; night lighting will not . occur except in an emergency situation. Noise • • • • • • With the eight-foot high sound wall proposed by the project to he located along the western right-of-way north of Melrose Drive/Rancho Santa Fe.Road intersection, the future peak hour average noise level would be 61 to 62 dB and future noise levels would not exceed FHW NCaltrans noise criteria at four hom,es lqcated along Rancho Santa Fe Road. The eight-foot wall height is based on th~ acoustical assessment prepared for the City of San Marcos to address the widening of Rancho Santa Fe Road at this location (DUDEK, January 2000). Assuming the City of San Marcos constructs this segment of Rancho Santa Fe Road, the City of San Marcos will be responsible for constructing the eight-foot high sound wall. If the City of Carlsbad constrUcts the proposed project first, the City of Carlsbad has committed to constructing the sound wall. All City construction timing requirements would be adhered to as a part of project construction. Stationary equipment will be placed such that emitted noise is directed away from sensitive noise receivers such as residential areas. - Stockpiling and vehicle staging areas will be located as far as practical from occupied dwellings. Every effort will be made to create the greatest distance between noise sources _ and receptors during construction operations. All construction equipment, including trucks used for hauling roadbed material, shall have exhaust and muffler systems in compliance with state standards for emission and noise control. Light and Glare • Directional street lighting will be utilized to direct.lighting away from existing residences. - 1576-17 ~.:! __ ~~I March 2000 --------------------------=-----~­~~~~~~ Final EIR Addendum. Rancho Santa Fe Road Realignment and Bridge Replacement 2-10 [~. . 1 I e Section 2.0 Project Description • • • Use median landscaping within specifications of the City's Landscape Manual to limi~ the effect of headlightS" to oncoming traffic. All street lighting will be property directed so as to limit excess light from. intruding into sensitive areas. City design will use low pressure sodium street lights for preservation of a "dark sky.» Visual Quality/Landform Alteration • All grading proposed for the roadway will conform with recorp.mendations of Appendix C of the ErR, Carlsbad' GradIng Ordinance and Hillside development regulations. • Proposed manufactured slopes will not exceed the maximum heights anticipated in the EIR (maximum 100 feet). • All temporarily exposed m~nufactured slopes necessary to accommodate the roadway will be landscaped immediately with a hydro seed mix and jute matting. • Step grading techniques will be used w~ere feasible in the construction of the three cut slopes proposed south of the replacement bridg~ to siinulate existing terrain, as well as to better accommodate hydro seeding and planting efforts • Grading techniques such as rounding the edges of the cut will be used to blend the slopes in the existing terrain • • • To control erosion, exposed portions of proposed fill and cut areas will be planted with a hydroseed mix containing native drought tolerant species. Due to the high viSibility of the proposed manufactured slQpea, cut slope areas a~jacent to natural areas will be planted with native, drought tolerant shrubs a,nd trees where feasible (shrubs and trees may not survive in cut areas that expo.se· rocky surfaces). All cut slopes will be treated with a hydroseed mix cOhta41ing native species. Planting will occur within three months a:fter grading and will be temporarily irrigated until plants beco~e established. All landscaping on manufactured slopes, as well as on, the roadway median, will comply with. the guidelines of the City of Carlsbad Scenic Corridor Guidelines Manual. {1I"tJII~liiiiiMaiiiiirohiiiii2iiiiioooiiiiiiiiiiiiiiiiiiii ______________ iiiiiiiiiiiiiiiiiiii __ iiiiiiiiii __ iiiiiiiiiiiiiiiiiiiiiiiiiiiiii __ ~1~57~Q~7 ~ASSOCIATES, INc..:.. ProfadonalT_forCom/>I .. d .... Jo<a Anal EIR Addendum. Rancho Santa Fe Road Realignment and Bridge Replacement 2-11 [1 [-~ ~l' \ .. ~\tJ. ["~l ~.!~ [] [~ [~ fI tI [J, [1 I ~i~l ~iJt ,,, I , G [1 Section 2.0 Project Description Traffic/Circulation • A configuration for the Melrose Drive/Rancho Santa Fe Road intersection has 'been established,by the Final Alignment Studies tJ:lat is c.Onsistent with the alignment established in the'EIRj. • Final Alignment Studies include a signal at the Questhaven Road/Rancho Santa Fe Road intersection. • The Final Alignment Studies provide for full signalization at the Rancho Santa Fe Road/Cadencia Street intersection. • A traffic control plan will be c01n:pleted which lists all timing, traffic and s<;ifety issues for construction of the roadway. The traffic control plan will prQvide . for truck rerouting and that miniInizes detours. The plan will be provided to the contractor. .... ~ioaiIl March 2000 1576-17 ----------------------------------.. ~~~~~, Pno~~;; Anal E1R Addendum. Rancho Santa Fe Road Realignment and Brtdge Replacement 2 .. 12 []~ . -< [J I ~ (~ ~ o o o 1 l- SECTION 3.0 DETERMINATION The CEQA.Guid~lines Section 15162 throug~ 15164 set .forth the criteria for determining the appropriate environmental documentation, if any, to be completed when there is a pre- existing adopted ErR covering the project. The City' provides the following findings: The Rationale of the Findings is. presented in Section 4 of this document. CECA Guidelines, Section 15162(a) and 15163 state that "when an EIR has been certified for 4 project, no subsequent or supplemental EIR shall be prepared for that project unless the lead agency determines, on the basis of substantial evidence in}ight of the whole public record, one or more of the following:" . 1. '(Substantial changes are proposed in the project which will require major revisions of the previous EIR due to the involvement of new significal1t environmentdl effects or a substantial increase in the severity of previously identified significant effects. 11 2. Discussion: As discussed in Section 2.0 of this document and illustrated in Figure 1, "the Final Alignment Studies for:. the roadway realignment and bridge replacement substantially conforms with the preliminary roadway alignment evaluated in the ErR. The. Final Alignment Studies provide the detail regarding grading and roadway alignment necessary to construct the alignment approved by the City that was not . identified as a part of the preliminary alignment evaluated in the EIR. As also shown in Figure 1, improvements 'associated with the Final Alignment Studies would substantially conform with that evaluate4 in the EIR.· As discussed in Section 4, ' Rationale, of this document, comparison of the environmental impacts considered in . the certified EIR with the current proposed Final Alignment Studies for the roadway realigJ.?-ment and bridge replacement would not result. in new significant environmental effects. The proposed action will not require any changes to the. project description that may have a significant adverse impact to the environmeI?-t. Therefore, no substantial changes have been identified. "Substantial changes occur with respect to the circumstances under which the project IS undertaken which will require major revisions of the previous EIR due to the involvement of new significant environmental effects or a substantial ~ncrease in the severity of previously identified significant effects. " . March 2000 1576-1i l'rrjcufotWT-Jorr-plal'roj«U Anal EIR Addendum. Rancho Santa Fe Road Realignment and Bridge Replacement 3-1 [l [l fl .A o [] [] ~ 1M lJ [J I i ~ C o [i r\~ L....' ~ ! L· • • Section 3.0 Determination 3. Discussion: No changes to the circumstances under which the EUt' was adopted in 1992, resulting in significant new or increased effects were. identified in the environmental review of the proposed roadway and bridge Final Alignment Studies. As discussed in Section 4, Rationale,. of this document, comparison of the environmental impacts considered in the certified EIR with the current proposed construction plans for the roadway did not identify any change to the baseline conditions or to impacts associated with the project. Consequently, no changes in circumstances have occurred that would require major revisions of the 'previous EIR due to the involvement of new Significant environmental effects or a substantial increase in the severity of previously identified significant effects. "New information of substantial importance, which was not known and could not have been known with the exercise of reasonable diligence at the time the previous EIR was certified as compiete shows any of the following;" a) b) c) "The project will have one or more Significant effects not discussed,in the previous EIR or Negative Declq!ationi or" Discussion: As discussed in Section 4, Rationale, of this document, no new information of substantial importance which was not kn,own and could not have been known with the exercise of reasonable ·diligence at the time the previous EIR was certified has been identified during the environmentalreview of the Final. Alignment Studies for the roadway realignment and bridge replacement. "Significant effects previously examined will be substantially more severe, than shown ' in the previous EIRi or" Discussion: As discussed in Section 4, Rationale, of this document, based on a review of the previous EIR, no previously examined effects will be more severe than shown in the previous EIR. "Mitigation measures or alternatives preViously found not to be feasible would in fact be feasible, and would substantially reduce one or more significant effects of the project, bt!t the project proponents decline to adopt the mitigation measure or alternativei or" DUDEK March 2000 1576-17· &I:ASSOCIATES, INC. iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiOiiiiiiiiiiiiiiiiiiiii ProfmI-IT_jorr-pa.Proj«b Final EIR Addendum. Rancho Santa Fe Road Realignment and Brtdge Replacement 3-2 [1. f)· rl r1 n [J ~;ft -\, <';; • Section 3.0 Determ ination d) Discussion: As discussed in Section 4, Rationale of this document, no new information or changes in the project design have been identified or proposed that would 'change the feasibility of any proposed mitigation measures. Measures incorporated ,into the project (see Se.ction 2.4) combined with mitigation measures adopted with the EIR in 1992 are found to be·adequate and mitigate for all impacts associated with proposed Final Alignment Studies for the roadway realignment and bridge replacement. "Mitigation measures or alternatives which are considerably different from those analyzed in the previous EIR would substantially reduce one or more significant effects on the environment, but the project proponents decline to adopt the mitiga~ion measure or alternative." Discussion: The proposed Final Alignment Studies for the roadway realignment and bridge replacement incorporate measures to reduce or avoid potential environmental impacts. As discussed in Section 4, Rationale of this document, there are no add~tional mitigation measures or alternatives required to implement the modifications to the project. Mitigation measures adopted with the EIR in 1992 are found to ~e adequate and mitigate for all impacts associated with proposed Final Alignment Studies for the roadway realignment and bridge replacement. CEOA Guidelines, Section 15164(b) states that ''An Addendum to a previously certified EIR may be prepared if only minor technical changes or additions are, necessary." Discussion: Only minor changes or additions are required. As discussed in Section 4, Rationale, of this document. The proposed Final Alignment Studies for the roadway realigIiment and bridge replacement would not ,create' new significant impacts o,r require substantial revisions to the mitigation measures identified in the EIR. In addition, the proposed Final Alignment Studies for the roadway realignment and bridge replacement would not meet the criteria set forth in Section 15162(a) and 15163 of CEOA requiring t?-e preparation of a Supplemental or Subsequent EIR. DUDEK March 2000 1576-17 & ASSOCIATES, INC. OiiiiiiiOiiiiiiiOiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii l'n1farional. »oruforCnoj>la /'rrJj«It Final EIR Addendum. Rancho Santa Fe Road Realignment and Bridge Replacement 3-3 f]. [J. [~ l~1 ,cili [1 [~ ~ I lJ [1 I ~ I~~ ... ~1 -1 J ] • Section 3.0 Determ ination CONCLUSION None of the above criteria triggered the preparation of a subsequent or supplemental EIR . pursuant to CEQA Guidelines Section 15162(a), 15168. Based oil the rationale discussed in Section 4 of this document, this Addendum to the previously adopted EIR has been pr~pared pursuant to CEQA Guidelines Section 15164. DUDEK March 2000 1 ~76-17 . &ASSOCIA.TES, INC. ~~~iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii;;;;;;'iiiiii;i ~n-jor~1WjIds Anal EIR Addendum. Rancho Santa Fe Road Realignment and Bridge Replacement· 3-4 SE£TION 4.0 RA.TIONA.LE • The Final Alignment Studies for the roadway realignment and btidge replacement qescr~bed in Section 2 substantially conform with the preliminary alignment ~nd bridge replacement location covered in the EIR. Figure 1 shows the alignment of the roadway covered in th~ :eIR as well as the proposed final alignment and limits of grading for roadway and bridge replacement. As s~own in Figure 1, considering that the road capacity, alignment, and limits of grading of the proposed project conform with that covered by the EIR, approval of the , ,Final Alignment Studies would not create new significant environmental effects or increase the severity of significant effects for the issues of air quality, traffic circulation, land use, light and glare, landform alteration, nOise,' floodplains, water quality, public services, hazardous wastes, visual quality, cumulative effects and growth inducement froIp. that identified in the EIR. The rationale for support of these conclusjons is discussed further below. Subsequent to certification of the EIR, technical studies 'and analysis have been completed related to the Final Alignment Studies for the roadway realignment to update the cultural resources and biological resources analysis. As discussed below, based on review of the technical studies and analysis no new significant impacts have been identified beyond that identified in the EIR related to these issues. ' The proposed bridge replacement location is consistent with that anticipated ip t~e EIR in , that the proposed bridge would be located immediately to the we'st of the existing bridge. , The proposed Final Alignment Studies provide detailed grading and design information for these improvements that were not included in the E1lt. Technical studies for the proposed' bridge replacement project in the areas of earth resources, biological resources, cultural resour~es, noise, hazardous materials, water quality, flood hazards and visual assessment were conducted to determine whether the Final Alignment Studies for RanchoSant~ Fe B,ridge Replacement would have an impact on the environment. It was determined, as discussed further below that with implementation of measures incorporated into the project design the Final Alignment Studies for the bridge replacement would not create hew significant environmental effects or increase the severity of significant effects ide~tified in the EIR. March 2000 1576-17 ~E~~~~;; Rnal EIR Addendum. Rancho Santa Fe Road Realignment and Bridge Replacement • Section 4.0 Rationale 4.1 Air Quality The EIR identified short term significant impacts to air quality associated with constructiop. and long term significant impacts based on the proposed roadway realighn:l.ent al).d widening as well as the urban development accommodated by the mass grading. Additional grading beyond that associated with the roadway was intended to accommodate residential, commercial, office, park, and open space as specified in the General Plan. Development in accordance with the proposed Final Alignment Studies for the ro~dway realignment and bridge replacement would not' create new significant impacts beyond that identified in the EIR. As illustrated in Figure 1, the limits of grading proposed in the Final Alignment Studies substantially conform to the preliminary limi~s of grading evaluated in the EIR. Short-Term Construction Impacts: Measures have'been incorporated into the design and construction process to reduce short term construction impact's below a level of significance (see Section 2.4). Long-Term Impacts: The Final Alignment Studies for the roadway realignment and bridge replacement would not increase the travelway width ot capacity beyond that addres~ed in the EIR. Considering that no additional capacity would be developed, no new long term air qualitY-impacts beyond that addresse~ in the EIR would be associated with approva16f th~ Final Alignmept Studies. 4.2 Earth Resources No features of the proposed Final Alignment Studies for the roadway realignment or the" bridge replacement would alter the conclusion of the previou~ ElR regarding geotechnical hazards or e,arth resources. The project would not involve an incr~ase from the limit of grading for the roadway alignment from that anticipated in the ElR. As a result, no new formations or soil types would be disturbed. In additi~n, no manufactured slopes proposed 'as a part of the project would exceed the lOO-foot maximum height identified in the EIR. As discussed in Section 2.4, all improvements p~oposed will be completed in accordance with the requirements' of the geotechnical analysis included as Appendix C of the EIR. In addition, supplemental geotechnical analysis has been prepared for the City by Agra' Enviropmeneal to address the Final Alignment Studies (Agra Environmental, 1998). Measures required by'the Agra Environmental repor~s to avoid geotechnical hazards such as soil instability, erosion or ~~"'" March 2000 1576·17 --------------------------~----~~ ~~~~~~ Anal ElR Addendum. Rancho Santa Fe Road Realignment and Bridge Replacement 4·2 '. . -." : -. '. -'" .. -". ~"." -'.- • • Section 4.0 Rationale dam instability from blasting represent refinements to the measures called for the in geotechnical report prepared for the EIR. As a result implementation of the Final Alignment . would not increase the severity of any geotechnical hazards from that identified in the EIR. 4.3 Water Resources The EIR concluded that surface and subsurface water quality would be adversely affected by urban contributions. Altering the 448-acre site through m.ass grading for urban development and realignment of the roadway would produce greater runoff and potentially increase downstream flooding. Development in accordance with the proposed Final Alignment Studies for the roadway realignment and bridge replacement would not create new significant impacts to water resources .beyond that identified in the BIR. The Final Alignment Studies for the roadway realignment and bridge replacement are in substantial conformance with the EIR and include all erosion control measures required by the City grading ordinance and the EIR be incorporated into the project design (see Section 2.4). A majority of the drainage from the roadway'would be outletted to existing drainages adjacent to the roadway as shown in Figure 2. All drainage outlets would contain rip-rap filters to slow the velocity of the runoff and minimize offsite erosion. Eventually, a majority of the drainage outlets associated with the roadway would be connected to systems associated with planned urban deveIo"pment in the area. In additionl the drainage system has been designed to reduce velocities of runoff that outlet into the adj acent drainages. . ~" A separate technical study has been prepared by the' City to evaluate potential effects of the bridge design on hydrology and water quality in San Marcos Creek. This study is incorporated by reference to this Addendum and is available for review at the City (Dudek & Associates March 241 1997). The report concluded that ~ith measures included in the, , design of the bridge that the hydrology and,water quality of San Marcos Creek would not be adversely impacted. These measures are listed in Section 2.4 of this Addendum. A separate technical study has also been prepared by the City to evaluate the potential impacts of the bridge replacement and associated roadway improvements to flood waters (Dudek & Associatesl·Jan~ary 1212000). The report concluded that the project does not C .... pla Projccu Anal EIR Addendum. Rancho Santa Fe Road Realignment and Brldge Replacement ~,~-~~ .. ~-· ..... ~,-t' ... "._, ....... ~._._~, ..... "'_." " ? .... ,_ ••••• _ .......... _._ •••••• ~ ._ .... ~ ._ ,'_ •• ~ •• "_" • __ .... -_. _ ... ~'-'-"" ., .. ""'-". . ..,.,. """ ---.. --. -.. ~ ',,-.. "" ' ..... '" "' ........... -_ ..... -.... ----~.-.-~ .... -.. -........ --....... __ ._._ ... ,---.... _.-~ ... _ .. e· .. 1,; • I ~h:.,; . .... ;. Section 4.0 Rationale encroach on the base flood plain of San Marcos Creek and that the risk from flooding associated with this project is not significant. Routine ~onstruction measures necessary to minimize short term impacts to the floodplain incorporated into the project are listed in Section 2.4 of this Addendum. 4.4 Biological Resources Development in accordance with the proposed Final Alignm.ent Studies for the roadway realignment and bridge replacement would not create new significant impact$ beyond that identified in th.e BIR. Measures have been incorporated into the design and construction process to reduce biological resources impacts. below a level of significance (see Section 2.4). As shown in Hgure 1, the Final Alignment Studies for the roadway realignment and bridge replacement would substantially conform to the preliminary alignment plan evaluated in the EIR would occur. Furthermore, the City has completed a' biological resources report subsequent to approval of the EIR that updates the biological resources analysis and addresses the specific impacts of the Final Alignment Studies for the roadway realignment and bridge replacement. The Biological Resources Report, prepared by Dudek & Associates in February 2000,. is incorporated by reference to this addendum and is available for review at the City. As discussed further below, the updated Biological Resources Report concluded that with measures incorporated into the project design no significant impacts to biological resources would occur. As discussed in Section 2.0 and shown in Figure 1, some minor modifiCations to the area of disturbance from that addressed in the EIR to accommodate temporary. construction activities, and improvements to existing roads ate necessary to implement the Final, . Alignment Studies. The construction staging area proposed to the south of the Melrose/Rancho Santa Fe Road intersection would be restricted to areas characterized by annual non-native grassland and no impacts to native vegetation or ripari8:n vegetation woulq occur. Proposed construction activities so~th of La Costa Avenue and in the vicinity of La Costa Meadows Driv:e would be restricted to the existing roadway or disturbed habitat immediately surrounding the roadway. Construction activities in the vicinity of the'existfng Ouesthaven/Rancho Santa Fe Road intersection would be designed to avoid disturbanc~ to 'coastal sage scrub and native grassland areas. Based on a review of the updated Biological Resources Report and with implementation of measures incorporated into the project listed in Section 2.4, the proposed construction staging areas and improvements to existing roads .... 1IiiiiiI .... ' March 2000 1576-17 ----------------------------=------~~~~~£~ Final EIR Addendum. Rancho Santa Fe Road Realignment and Brtdge Replacement 4-4' -:--: . ..., ... ~, -. ~~, ~ '. -. '. .. . ".: ................ ':,--... ; .. -.... ;-':--',_.--..---."-;--'" 'J ,1' t" .:l ~'~I' " ,- • Section 4.0 Rationale weuld net create new significant impacts to bielegical resaurces beyend that identified in the EIR. Upland Vegetation and Sensitive Animal/Plant Species The EIRidentified impacts to. the upland'vegetatien cemmunities, the Califerniagnatcatcher and sensitive plant species. As discussed in Section 5.4 ef the EIR (pgs 5.4/12-15), the readway and assaciated mass grading weuld result in signi~cant impacts to. ceastal sage scrub, the Califernia gnatcatcher, and San Diego. Geldenstar. The updated Bielagical Reseurces Repert (Dudek & Assaciates, February 2000) cencluded that th,e roadway realignment weuld result in a similar level ef distlfrbance ef sensitive upland v~getatien, including ceastal sage scrub and seuthern mixed chaparral, as that, anticipated far the readway realignrnent in the EIR. Beth the updated Bialegical Reseurces Repert and the BIR also. identified significant impacts to. the sensitive plant species San Diego. Geldenstar. Sensitive animal species impacted included the Califernia Gnatcatcher and patentially eccurring rapter species. As described in the updated biek>gical reseurces repert, the City has cemmitted that upland vegetatian cammunities and sensitive species weuld be mitigated within the cantext ef the appreved Habitat Censervatien Plan/Ongeing M~lti-Species Plan (HCP/OMSP). Use af the HCP/OSMP as mitigatian far impacts ef the Final Alignment Studies to. upland . vegetatian and sensitive species is censistent with the mitigatien requirements ef the EIR. The EIR cancludes that all impacts to. upland vegetatian and sensitive species weuld mitigated ence the HCP/OMSP has been adapted and a system ef mitigatien credits are in place. Censistent with the requirements ef the EIR, the City has implemented the, requirements ef the HCP/OMSP in the farm af purchasing credits to. mitigate impac;:ts'to upland vegetatian and sensitive animal and plant species asseciated with the roadway realignment. The updated Bielagical Resaurces Repart also. addresses recently listed ,endangered species, as well as ether sensitive animal and plan~ species that were net cavered by the EIR. The repart cancludes that all mitigatian required in the approved HCP/OMSP weuld address all, patentially accurring animal species except fer two. fairy shrimp species, quine checkers pot ' butterfly and Pacific packet meuse. Accerding to. the Bielagical Resaurces Repert, surveys fer the quina checkers pet were negative and the habitat ensite is inapprepriate fer the pocket March 2000 1576-17 S;;~~~~~;; Final EIR Addendum. Rancho Santa Fe Road Realignment and Bridge Replacement 4-5 '~1 ., \: • • Section 4.0 Rationale mouse. In addition, the site is located in a portion of the County for which the USFWS determined in 2000 that no additional surveys would be required if negative surveys had been previously conducted. Vernal pools would not be impacted by tp.e project. As a result, it is not anticipated that the road w0uld directly impact fairy shrimp. The Biological Resources Report also included surveys for sensitive reptile species including the California redlegged frog that were negative. Results of surveys for San Diego thornmint were also negative. Wetlands The ErR concludes that the project would result in impacts to jurisdictional w~tlands and that mitigation in the form of offsite crea~ion/enhancement ~s well as obtain~ng the' necessary permits from the ACOE, the CDFG and RWQCB will be required prior to construction. The updated Biological Resources Report concludes that the roadway and bridge replacement would disturb approximately 1.5 acres of riparian habitat includingACOE jurisdiction waters. Measures incorporated into the project to reduce impacts to wetlands to below a level of significance are listed in Section 2.4 of this Addendum and are consistent with those measures listed in the EIR. Considering that measures are incorporated into the project including commitment to offsite wetland restoration/creation and that the proposed project substantially conforms to the limits of grading covered by the EIR, no new significant impacts to wetlands beyond that identified in the EIR would be associated. with implementation of the project. . . The updated Biological Resources Report id~ntifies four vernal pools in the project vicinIty that were not identified in the EIR. However, these vernal pools would be located approximately 200-600 feet from the proposed limits C!f grading for the Final Alignment. As , a result, It is riot anticipated that implementation of the roadway would impact these vernal pools. . 4.5 Noise The ErR concluded that increased traffic on the proposed roadway would result in long term # noise level greater than qO db(A) at the property line from increased traffic on the realigned Rancho Santa Fe Road. As a result, residential land uses proposed adjacent to the roadway may experience significant noise levels. Mitigation identified in the EIR consists of implementation of meas~res contained in the City Noise element as a part of future developments adjacent to the roadway. ~.lURI.JII~'iiiiiMaiiiiirehiiiii2iiiiiooOiiiiiiiiiiiiiiiiiiii __ iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii~~1iiiii57~6'_17 /§t ASSOCIATES, IN~ Pro{wlotlal T ...... for Cmnplrx I'n>jem Anal EIR Addendum. Rancho Santa Fe Road Realignment and Bridge Replacement 4-6 ...... ~~~~,..,."" ... "''\ ......... l'>-• ..,.-.... -.-.. \1 ..... ~ • .,''''n'>1"'> ....... ~ ....... _,.-.. .... ~ ..... __ .,, ___ .... '" •• __ ...., ......... __ ._ .,' ,.,. '~" _ ... _ ..... _._ ............. ,_ ~ __ .~ _ '._ •• _~._ ~ •••• _ ... '_"""_ .--, , .' __ ._.... •• , •• _' _. , .... __ •• ~ ......... __ . ". __ , .... " •• "._ ." _ •• .,. • __ rl .s,.; [11 l .,' " .~ """"'] 1 QI II • • Section 4.0 Rationale Implementation of the roadway realignment and widening, in accordance with the Final Alignment Studies for the roadway realignment and bridge replacement would not create new significant impacts in terms of construction noise or long-term traffic generated noise . beyond that identified in the EIR. Measures have beeri incorporated into the design and . construction process to reduce short term construction noise impacts below a level of significance (see Section 2.4). The Final Alignment Studies for the roadway realignment and ,bridge replacement would not increase the travelway width or capacity beyond,that addressed in the EIR. Considering that no additional capacity ,would be developed, no new long term impacts from traffic noise beyond that addr~ssed in the EIR would be associated with approval of the Final Alignmen,t Studies' , . Furthermore, the City has completed an acoustical report subsequent to approval of the EIR to comply with the requirement of the EIR that subsequent acoustical studies be prepared to refine measures necessary to reduce impacts from traffic noise on resid,ential proje,cts. The acoustical report (Dudek & Associates, 1997) is incorporated by reference to this Addendum and is available 'for review at the City. The report conCluded that with measures incorpGrated into the project design (see Section 2.4) no significant impacts to existing residences in the vicinity of the roadway would occur. 4.6 Light and Glare No new significant impacts from light and glare to existing residents are anticipated with proje<:t implementation beyond that identified in the EIR. The proposed project . design . incorpora tes measures required by the EIR (see Section 2.4) to reduce light from the roadway. In addition, the alignment for the roadway was chosen by the City to maximize the distance ' between the roadway and the exi~ting residences in the vicinity of La Costa Avenue. The' proposed alignment conforms with that anticipated by the EIR. As a result, no lighting, sources from the proposed project would be closer to the existing residences than from that evaluated by the EIR. 4.7 Land Use The Final Alignment Studies proposed for the roadway conform with the alignment and capacity evaluated in the EIR and approved by the Circulation Element of the City General Plan. Therefore, the proposed project would not create any new land use inconsistencies With relevant land use planning documents beyond that identified in'the EIR. March 2000 1576-17 ~~~~~; Final EIR Addendum. Rancho Santa Fe Road Realignment and Bridge Replacement 4-1 " 1 r!l j • • Section 4.0 Rationale 4.8 Public Services Implementation of the proposed Final Alignment Studies for the roadway realignment and bridge replacement would not generate additional population growth. The proposed Final Alignment Studies implement the roadway alignment and capacity increase evaluated in the EIR. In addition, widening the roadway is designed to implement the approved Circulation Element of the City General Plan. The Circulation Element provides for transpbrt,ation elements necessary to accommodate both existing demand and planned growth within the City. 4.9 Utilities Adoption of the proposed Final Alignment Studies would not generate demand for seWer, water, natural gas, electrical or solid water services. It is anticipated that utilities such as sewer, water, gas and electricity necessary to serve future development would be located within the alignment proposed for the roadway. Howeve"r, adoption of the Final Alignment Studies and construction of the roadway itself would not include any utility connections or increase demand for those services. As a result, implementation of the project would not create any new significant impacts with respect to utilities from that anticipated by the ElR. 4.10 Landform AlterationNisual Quality The Final Alignment Studies proposed by the project would implemep.t the alignment and roadway Width anticipated by the EIR. The limits of grading or location of the-rQadway " proposed as a part of the Final Alignment Studies su~stantially conform with that identifie.d iIi the EIR and approved as a part of the General Plan Circulation Element are proposed. Therefore, quantities of earth work as well as size of manufactured slopes (50-100 feet) would not exceed that anticipated by the EIR. In addition, the proposed project design,incorporates the measures required by the EIR to mitigate potential impacts to existing land forms and visual quality. These measures are listed in Section 2.4 of this Addendum. A separate visual assessment was prepared by the City for the bridge replacement portion of the project in 1997 to further define measures necessary to reduce visual impa(:ts associated with manufactured slopes identified in the Final Alignment Studies (DUDEK, March 25, 1997). Preparation of the technical study was completed in accordance with the requirement March 2000 1576-17 ftw Complex p,.jectI Final EIR Addendum. Rancho Santa Fe Road Realignment and Bridge Replacement 4-8 . r~' {~~ [j [j [1 ~~{i rp u I ~ lJ [J [] I [fl"' ~t:I. ,"-n, ~ o [-I ~I lJ U , f ...J • , • " ; j' Section 4.0 Rationale of the EIR that grading from hillsides be designed to maintain the appearance of natural slopes wh~re possible, The visual assessment is incorporated by reference to this document ,and is available for review at the City. Measures' required in the visual assessment for potential impacts to visual quality associated with exposed manufactured slopes have been incorporated into the project (see Section 2.4 of this'Addendum). 4.11 C,ultural/Historic Resources The EIR concluded that six historic sites within the project area are vulnerable to destruction. Five of these s~tes are considered potentia~y important. The EIR required further site testing and surveys as a part of future development of urban uses to mitigate for potential impacts to these cultural sites. The City has completed a cultural resource study subsequent to the approval of the EIR that cover the proposed Final Alignment Studies for both Phases 1 and 2 of the roadway (Gallegos & Associates, 2000). These cultural resources studies are'available for review at the City of Carlsbad and are incorporated by reference to this Addendum. The cultural resour~es studies prepared for Phase 1 for Phase 2 concluded that the proposed Final Alignment Studies would avoid disturbance' of significant cultural resources. Therefore, implementation of the proposed Final Alignment Studies would not result in new impacts to cultural resources from that identified in the EIR. 4.12 Traffic/Circulation The EIR concludes that traffic volumes would increase in association with development of the 448-acre area'proposed for mass grading: However, the realigned and widened Rancho Santa Fe Road would operate acceptably by accommodating proposed traffic levels and improving levels of service at intersections in the project vicinity. As a result, the EIR concluded that development of the project area as well as construction of the roadway would not result in significant adverse impacts to traffic congestion or circulation within the project area. Adoption 'of the proposed Final Alignment Studies would not alter the alignment or capacity of the roadway from that covered in the EIR and, therefore, would implement the traffic congestion relief anticipated by the EIR with implementation of the realignment. As discussed in the EIR, the proposed roadway realignment, widening and 'bridge replacement 1L=i-=---~1 March 2000 1576-17 ----------------------------~----~ ~~~~~p,.;;jecU;: Final EIR Addendum. Rancho Santa Fe Road Realignment and Bridge Replacement 4-9 " rt • ,4 [j~ r'f ~,m~ [j 0', -:;.'~ o U:: :.1 he' [I [~f j ... j c [ [ [ [ [ • • SECTION 5.0 MITIGATION, MONITORING AND REPORTING PROGRllH (MMRP) The City is responsible for the overall implementation and management of the MMRP through the design, construction and operations period. . The mitigation measures that were adopted as conditions of pr<;>ject approval are described in the EIR (see Section 2.0, Summary of Findings). The City has incorporated, as part of its proposed Final Alignment Studies for the roadway realignment and bridge reptacement, a number of ~easures to reduce or avoid potential environmental impacts associated with . '..:-. construction and operation. These measures are considered part of the proposed Final Alignment Studies are listed in Section 2.4 of this document. No other mitigation measure has been identified as necessary in order to accommodate the proposed project. .Anal EIR Addendum. Rancho Santa Fe Road Realignment and Mass Grading rl~ " r];+ [1 (] rM [~ 9 ~) " :~>::' [1 fJ I i ~>.~ ~~ . 'j.-".:: [1 [1 [J Cl o [I '. SECTION 6.0 REFERENCES • Dudek & Associates, March 24, 1997. Water,Quality Study Rancho Santa Fe Bridge Replacement Project. Dudek & Associates, March 25, 1997. Visual Assessment of Rancho Santa Fe Road Bridge Replacement. Dudek & Associates, April 7, 1997. Phase 1 Environmental Assessment for 55.55 acre Rancho Santa Fe Bridge Replacement. Dudek & Associates, January 12, 2000. Floodplain Evaluation Report Rancho Santa Fe Bridge Replacement Project. Dudek & Associates, January, 2000. Draft Acoustical Asses~ment Report Rancho Santa Fe Bridge Replacement Project. . . Dudek ~ Associates, February, 2000. Bjological Resources Report for Rancho Santa Fe Roadway Realignment and Bridge Replacement Project. Gallegos & Associates, February, 2000. Cultural Resources Report for RanchoSanta Fe Roadway Realignment and Bridge Replacement Project. __ ~~I~Ma~~~h~W~OO __________________ ~ ______________ ~ _______ 1_5~~ __ -17 ~~~~~; Rnal EIR Addendum. Rancho Santa Fe Roadway Realignment and Mass GradIng 6-1 • .' \. RECEIVED FEB 05 2003 ENGINEERING DEPARTMENT .; "~" , ...