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Home My WebLink AboutCT 89-26; SPYGLASS; Planning Commission- - - - - - -- - - - - - -r 11 1 i :1j..,/ ; : ; - I.. 1 - Z' Ar- ç SE COR or r 171 kill •.Id•- -' - ' -1 ri-i .-------. ...... ._L.. . 1 .1. ..... .. . . '4.. •? .. . . .. . 1 . • . . •1 • :i• •• ' . . . . . ()9S .4 , I •' •, •Y • .. 161 - .. . . ' I • I . .. . : . . . . : • • # . ' ,1 • ' . . , . .t . ; . '-: : , • . , , . . . . .5 L_ • •. . . . ' crr ?.... . . . In III <e2 I :•'' L . •\ . ... ' CO jL rill ,. , II ••%_ . -. .,4' . / to LYt Ie . . 55• 0' • \ CD IC- . Cn :iIi ! : , . . . (5% S •j (/ •'.. P -1 ri : Ir w 001 ka: D --o rd 71 i! . •.•':• • \.i.c#.r :,.. P':• c5 n ' '•'' - • ')-?-' , - :. •• ;f . • - c(T.) . - A • , t) & \rN)- ; _-;:;:\': \ ' ' ) \ -,. p •1----- p -I '.i- Im \ ( /T••' : A • • , U ' •- _1_ \ I F 10 __-._.S ......... i. . . . . ". i..'.. i . S \ '• . .-S I,.. • •e. . . \ p j . :17 \ \ L p .. ' , S •\ I t 'S..- t .;1 . (nry . A I . t t .. tI _•jf ry lit 2 A A P r Ik. L. • \ . • ct•11N ,- ETAsr\t\t . 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STE C P0 SOX 431 SAN DIEGO. CA P2111 CA ESBAD CA P (619)292-1353 (619)72961121 (619)737-5126 RRUcEA.TArr *CE32247 DATE *ICRARDBTHERXIEN DATE HORACE FEUCINS LEGAL DESCRIPTION VIM= MAP SPYGLASS CARLSBAD TRACT N SUMMARY NOTES DATE OROSSACIEAOE UNITS 4AC. GALPHOP314RTP2N RLM(o-4DWAC) g OPEN SPACE 2 WATER COSTA REAL MUNICIPAL CENITABLERENSTTY ACREAGE **c C2TPOFCAZLSIAS 22 GUY Arl 2.1 AC. TELEPHONE PACIFICIELL \ ATII4JEDCYOS &OAS 30015 GRADING MR CITY STANDARDS 409. SCHOOLS CAELIIADUNTPTEDSQIOOLDI3TUNrrPERø4 7EDENSEDRlED MANAGE 306452 r N < ILEPDA*EA 3.1 AC. LEGEND OPEN SPACE LOTS 3AAC. 9, (,,. - 1209 SQ. Pt IOIJNDAXYLINE LOTLINE CENTER LNE MLINE DWELLING MD. I / PAD ELEVATION -, - I.OTSGE 9-3- MANHOLE WATER -fpwm23lf-- GAS FrOKM DRAINAGE TELEPHONE PROPOSED GKADrNO PROPOSED CONTOURS $6 TERRACE DRAIN CROSSO(JTTER R HYDRANT FIRE bOl /)/\U1 \.- STREEFIJGIIT CATCH BASIN CLEAN OU'r wj ____________ 2. _ -:-::-:-- 9: -/ i >Z - .:/ __ WJ.J..1LILJ _.r)[ - I )f ,i ' ___________ E - -- — --- '-- —'— _ - - — - - - - - - - - - -- TCRQSS SECTION ' • CAMr*-- - . -- AW~1AG(. 5 .IP1 ' / - ----------- -- MULTIPLE PINAL MAPS MAY IER!CO9-DED BASED UPON AS$AS99.Ov30 7 1 ? TATIVEMENACCORDINOTOATflCEE4SECflON40.4360p7)45 — - 9 ZU30IV1ON MAP ACT. I - -. c,1 I EXHIBIT A DAILY TRAFFIC PROJECTIONS FOR PROJECT SITE 37,400\ 300600 jj;3c!j \ 't, Lio,900 4E-4574 WEST?- in 72- 0 PROJECT rf'E 17 SINGLE FAMILY UNITS I ws a. f1 xxx EXISTING TRAFFIC COUNT PER CITY PUBLIC WORKS DEPT. I I' ULTIMATE ADT 0 TRAFFIC, IN ADT, GENERATED BY PROPOSED PROJECT dIIIIa' .IIIII J'It1 -11 PIN DR 4 . City of Carlsbad HDP 89-47 SPYGLASS SUP 89-9 !Ii rn Certificate of Authenticity (Roll and Unitized Microforms) This is to certify that inicrophotographic images appearing on this film file are accurate and complete reproductions of the records identified below as delivered to Monterey Systems, Inc. for microfilming. ft Customer: Cl O 6'1,2z~~av~ Department: Project Title: 77- d- Reduction Ratio:5 Date Filmed: - 9 Technician: EJ /4S5'\/ It is further certified that the microphotographic processes used to create this film file were accomplished in a manner and on film that meets with the requirements of the National Bureau of Standards and the American National Standards Institute for permanent microphotographic film copy. Monterey Systems Inc. Source Division 131 -00 I I I I I I I I I I 1 I I I I I I ACOUSTICAL ASSESSMENT REPORT SPY GLASS CITY OF CARLSBAD Prepared for: Therrien Development Company 2979 State Street, Suite C Carlsbad, California 92008 Prepared By: Illingworth & Rodkin, Inc. 160 Chesterfield Drive, Suite 10 Cardiff By The Sea, California 92007 June 30, 1989 (Revised September 29, 1989) *utdEVVED NOV 8 1989 CITY OF CARLSBAD '' ru I aw4j . 1! I I j I I I I I I I 1 I I .1 I I I I 1 I I TABLE OF CONTENTS Section Title Page 1.0 Introduction 1 2.0 Existing Conditions 4 3.0 Future Conditions 7 4.0 Mitigation 10 LIST OF FIGURES Number Title Page 1 Regional Project Location 2 2 Site Plan 3 3 Future Noise Levels (in CNEL) 9 4 Proposed Mitigation Measures 12 LIST OF TABLES Number Title Page 1 Existing CNEL Noise Contour 6 Distances at the Project Site 2 Proposed Mitigation Measures for 13 First and Second Floor I 1 1.0 INTRODUCTION I This acoustical analysis was prepared to evaluate the I potential noise impacts for the proposed Spy Glass project. Noise generated along El Camino Real and Elm Avenue could I potentially affect the proposed project. The acoustical analysis assesses the existing noise conditions, projects I future noise levels and potential noise impacts, and identifies mitigation measures designed to reduce noise I impacts. I The Spy Glass project is a proposed 17-lot single family Li project. The site is located at the southeast corner of El Camino Real and Elm Avenue in the City of Carlsbad. Figure 1 I depicts the regional location of the project site. Figure 2 I shows the site plan. [1 The proposed project could be exposed to noise levels which would exceed the City of Carlsbad's noise guidelines. I Mitigation measures have been identified which would reduce I noise impacts to below a level of significance. I I I I 1 0S I USA BORDER Ft CURE 1 1 I I I I I I I I PACIFIC OCEAN I I I I I I I I I I Ilti COUS CA NGlt4ERS1tjj REGIONAL PROJECT LOCATION oil 01 RIVERSIDE COUNTY FMLBROOK PROJECT SITE 178 ESCON1IDO CARLSBAD ENCINITAS SANPI RAMONA Im CHULA VISTA LI LI d I I I [] I I I I Li LI LI I I I I (,,, ACQU5T iC.l U"flIII! I 9 20 EXISTING CONDITIONS The proposed project site is located at the southeast corner of El Camino Real and Elm Avenue and is generally only exposed to noise generated by vehicles travelling along these roadways. Community noise levels are generally presented in terms of CNEL (Community Noise Equivalent Level). CNEL is the average equivalent A-weighted sound level during a 24-hour day. It is calculated by averaging the daytime, evening and nighttime noise levels. Five decibels are added to the average noise level (Leq) in the evening and ten decibels are added to the nighttime noise levels. The five and ten decibel penalties are applied to account for increased noise sensitivity during the evening and nighttime hours. City Noise Guidelines: The City of Carlsbad has adopted an Administrative Noise Policy which establishes noise criteria for residential projects. The City's Noise Policy identifies the compatible exterior noise level for residential development. The maximum exterior noise level limit at five feet inside the residential property line is 60 CNEL. Vehicular Traffic: Based on a traffic count taken during January 1989, the average daily traffic volume along El Camino Real adjacent to the project site is approximately 22,000 Average Daily Trips (ADT) (City of Carlsbad 1989). I Li I I I I I I I [1 I I I I I I I I I 21 0 I The traffic volume along Elm Avenue is approximately 10,500 ADT. I The vehicular traffic noise was calculated using the Stamina 2.0 noise prediction model (Federal Highway Administration I Report Number DF-81/0001a). The model was used to estimate I the existing noise levels generated by traffic along El Camino Real and Elm Avenue. In addition to traffic volume, I other parameters used in the noise model include vehicle speed, truck mix and percent roadway grade. The truck mix was based on a vehicle mix survey conducted for the project. ' Based on the survey, approximately one percent of the traffic volume along El Camino Real are heavy trucks and 1.5 percent I are medium trucks. Elm Avenue consisted of 0.5 percent each of medium and heavy trucks. The existing noise level is calculated to be approximately 70 CNEL at 90 feet from the centerline of El Camino Real. The CNEL at 100 feet from Elm Avenue is calculated to be 63 dB. Table 1 depicts various distances to CNEL noise contours associated with traffic from El Camino Real and Elm Avenue. Ambient noise levels at portions of the site would be lower, as the effects of topographic and building shielding are not taken into account. I I I 5 01 TABLE 1 EXISTING CNEL NOISE CONTOUR DISTANCES AT THE PROJECT SITE Approximate Distance to CNEL from Centerline (in feet) 70 CNEL 65 CNEL 60 CNEL 90 290 625 -- 55 185 Does not account for topographic shielding I I I I I I I I I I I I I I I I I I I Roadway El Camino Real Elm Avenue I 3.0 FUTURE CONDITIONS Future noise levels were calculated in a similar manner as I the existing noise conditions. To determine the maximum noise levels that could be experienced onsite, buildout I traffic volumes, provided by the City's Planning Department were used for El Camino Real and Elm Avenue (i.e., 30,600 and 10,900 ADT respectively). A grade adjustment factor was used I to account for the uphill portions of El Camino Real and Elm Avenue. I The analysis of future conditions utilized the grading I elevations depicted in the tentative map (August 17, 1989). I With the exception of Lots 1, 2 and 9 all of the homes would be two stories high. The city requires that noise level I limits be met immediately above the highest window or door and five feet from the property line. Based on conversations I with the City Planning Department staff, the property line is I defined as the usable portion of the lots. A review of the architectural building plans shows the height above the I highest window or door to be approximately seven feet for a one story house and 16 feet for a two story house. I I The proposed single family homes would be elevated above both El Camino Real and Elm Avenue. The closest home adjacent to I El Camino Real would be on Lot 2 approximately 200 feet from the centerline. This lot would be exposed to noise levels of I approximately 68 CNEL at five feet from the lot line. As 7 0 I part of the tentative map, a four-foot high wall would be I constructed adjacent to Appian Road. This wall would reduce first and second floor exterior noise levels at the adjacent I lots (Lots 3, 4, 5, 6, 16 and 17) to 60 CNEL or less. The closest building lot to Elm Avenue is Lot 12 which is I approximately 80 feet to the centerline. Noise levels at Lot 12 would be approximately 63 CNEL at five feet from the lot I line. Noise levels at Lots 1, 10, and 11 adjacent to Elm Avenue would also exceed 60 CNEL. I I Figure 3 depicts the projected first floor noise levels at the lots adjacent to El Camino Real and Elm Avenue. Lots 1, 2, 10, 11, and 12 would exceed the City's noise limits and would result in a significant noise impact if not mitigated. I The lots without individual noise level projections shown in Figure 3 are expected to be less than 60 CNEL in the future. All the homes except on Lots 11 and 12 are projected to be exposed to noise levels of 60 CNEL or less at the second floor levels. With the exception of the I homes on Lots 11 and 12, the homes have been designed with adequate set back distances or with single story homes. I I 1-1 I] El;] I [1 Lu cc — 1 / •;' 'S / 10 40 ej i \C4 r I co \ I 1 . - \\ \tx Alt V6 01 0 FEET 125 Fl G U R E FUTURE NOISE LEVELS (in CNEL) 3 Fill I I I I I I I I I I I I I 1 (/ j • '.\ - - / H- " - - I I ' _LUNG WORTH&RODKIN, INC 1III4CQIJSTICA& ENGINEERSIII/ .2 0 El 1 4.0 MITIGATION To comply with the City of Carlsbad's exterior noise requirements, the proposed project would be required to reduce exterior noise levels at five feet inside the building pad lot lines and immediately above the highest window or door opening to 60 CNEL or below. I Potential noise impacts could be mitigated by constructing walls on top of the three-foot berms depicted on the I tentative map or by increasing the berm heights. Table 2 I summarizes the recommended mitigation measures to comply with the City's exterior first floor noise requirement. The I recommended measures are depicted in Figure 4. The measures recommended in Table 2 will also mitigate the second floor I noise levels of the homes on Lots 11 and 12. The noise barriers may be constructed as a wall, berm, or combination of both. The materials used in the construction of the barrier are required to have a minimum surface density of 3.5 pounds per square feet. They may consist of masonry material, wood, 5/8 inch plexiglass, 1/4 inch plate glass or a combination of these materials. The barriers must be designed so there are no openings or cracks. 1 Mitigation Monitoring and Reporting: Once a final mitigation I plan has been approved for the site, the City of Carlsbad is 10 I I I I I I I required to implement a noise mitigation monitoring and reporting program to comply with California State Assembly Bill Number 3180 (effective January 1, 1989). This program shall be designed to ensure compliance with the proposed mitigation measures. I I I I I I I I I I I I 11 0] INSM 49 41?41' TQlll / Wl LLJ 1H4 / ' p d W \ I j r ' _____ I i \ - (4>. 'I<'\.. 'W.' '• •1 ' s i - ' \ In \ \J \\ \ wl "T \ 4 \ 1-1 1 I I I I 11 1 I Li I I I 0 FEET 125 14- oil ~4 to Ln I FIGURE PROPOSED MITIGATION MEASURES 4: I I I I I I LIJNGWORTH&RODKIN,INC J$ ACOuST CAl ENGINEERSIII/ 12 I I I I I I 1 I I I I I I I I I I I I First Floor Recommended Lot Number Measures 1 5' Barrier (includes 3' berm height shown in tentative map) 2 7' Barrier (includes 3' berm height shown in tentative map) 10 4' Barrier 11 4' Barrier 12 5' Barrier PROPOSED MITIGATION MEASURES FOR FIRST AND SECOND FLOORS TABLE 2 13 Not Applicable Not Required Same As First Floor Same As First Floor Second Floor Recommended Measures Not Applicable