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US Army Corps of Engineers, January 12, 1989, "Rancho Palos Verdes, Rolling Hills, California Shoreline Erosion and Storm Damage" Reconnaissance Study I I 14.. 1 US Army Corps of Engineers Los Angeles District RANCHO PALOS VERDES, ROLLING HILLS, CALIFORNIA SHORELINE EROSION AND STORM DAMAGE RECONNAISSANCE STUDY PUBLIC INFORMATION WORKSHOP CITY OF RANCHO PALOS VERDES, CALIFORNIA JANUARY 12, 1989 4* . -Ns \ 17111:4 1)Y . T Op DEPARTMENT OF THE ARMY •�,,�� ",•� LOS ANGELES DISTRICT,CORPS OF ENGINEERS P.O.BOX 2711 W � LOS ANGELES,CALIFORNIA 90053.2325 'ay111p9` .M � c • f sTAT f.S U1�� REPLY TO • ATTENTION OF. Office of the Chief Coastal Resources Branch • NOTICE OF PUBLIC PARTICIPATION MEETING CONCERNING . . RANCHO PALOS VERDES COASTLINE • EROSION AND STORM DAMAGE STUDY, CITY OF RANCHO PALOS VERDES AND THE CITY OF ROLLING HILLS The Los Angeles District U.S. Army Corps of Engineers has begun a study to identify the Federal interest in solutions to problems associated with shoreline erosion mitigation measures and storm damage along the coast of the City of Rancho Palos Verdes, including consideration of how such solution would contribute to landslide stabilization. The study was authorized under Section 712 Water Resources Development Act of 1986, PL99- 662. A public meeting to discuss the study will be held on January 12, 1989 at 7:30 P.M. at Hesse Park, 29301 Hawthorne Boulevard, City of Rancho Palos Verdes, California. All interested persons and organizations are invited to be present or represented. . The purpose of the public information meeting is to inform you of the current reconnaissance study, and to solicit your participation in the study process. The meeting will be informal, and everyone is encouraged to attend and express their views concerning the shoreline erosion and storm damage problems to be considered in the study. Please plan to attend so that your ideas and interests can be heard. Your involvement, and expressions of concern about the Rancho Palos Verdes shoreline erosion and storm damage problems, related issues, and their prevention are necessary for the successful completion of our study. We encourage your attendance and interest. If you cannot attend this meeting, we would still appreciate receiving your views and comments, including the information requested in the announcement-booklet. Please send your letter to the address above, attention of Ms. Anna Zacher, Study Manager, CESPL-PD-CS. If you need additional information about this meeting, you may contact Anna Zacher at 213/894-2028. - 1 - We have attempted to send this information to all individuals and organizations that have an interest in the Rancho Palos Verdes coastline resonnaissance study and the shoreline erosion and storm damage problems. If you know anyone who would like to attend, and who has not been contacted by us, please bring this invitation to their attention. Sincerely, A414...4aL)t Tadahiko Ono Colonel, Corps of Engineers District Engineer - 2 - INTRODUCTION This meeting booklet provides information about the study background, describes the study area, and provides a map of the study and problem areas. Examples of measures that will be considered to control shoreline erosion and protect against storm damage are described and depicted. The types of information we need from the general public for this study are outlined in page 11 This questionnaire is provided for your convenience, and can be used to present questions, or to give us information whether or not you are ableto attend the scheduled public meeting. Background of the Study The U.S. Army Corps of Engineers, Los Angeles District, has been authorized to study the feasibility of constructing shoreline erosion mitigation measures along the Rancho Palos Verdes coastline and in the City of Rolling Hills and to provide additional stability for the Portuguese Bend landside and adjacent landsides. The reconnaissance phase of the study has begun. The final report is scheduled for completion by October 1989. The purpose of the study is to identify if there is a Federal interest in a project that could solve the shoreline erosion problems and provide stability in the landside area. We will be evaluating all viable solutions to determine if a potential Federal project can be justified, and if further study can be recommended. The study area will be investigated from a regional and local perspective relative to shoreline stability and protection. This type of focus will more effectively identify the extent of the problems and indicate the available opportunities for a solution in the study area. Description of Study Area The study area includes the entire Rancho Palos Verdes coastline, and specifically the shoreline seaward of the Abalone Cove, Portuguese Bend, and Klondike Canyon landslides in the City of Rancho Palos Verdes; and the Flying Triangle landslide in the City of Rolling Hills. Figure 1 shows the location of the study area, and Figure 2 delineates the shoreline stabilization problem area. - 3 - { /��•°. �. ��� �«, -r1� iii�� ;•(, I.1 ri \ \", A) Ii, •il t r yi-,� ,, Imo` '; +. /)�� •.. /, :�y .) .0', r...,,,,,.„,, � t �in �7..�,T•••— ` ii, 0\ ! ... 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' •11: i•Fe.1 A. :--; t 746),,,, , ..-- -- % --- '-‘1„.., •iiski -ci: i•p u c; ' ---------"44.. -,,.-_, 4 ,..irf ,- -6 \ otja • n , � �� __Sovth '.-•-•-.., /a, '.e � % eJ ; * ))I - . .4. _.„...•..... , A ii • ----______n \ ._„..,..,.._, f14:;41etzu se loyilz ' 2)r-------- --_, , - ,... rfspi ion *• e ;' 0 1000 2000 ' 4 P t h �Cy 4: ' ".....:.,,--.k ;` k�---rte _ FEET Pacific Ocean 6 *°?e `, FIGURE 2 - Rancho Palos Verdes and Rolling Hills Landslide Areas • - 5 - • Description of Alternative Measures - The following description of measures describes some of the options which may be considered for shoreline erosion and storm 'damage problems in the study area. Thesearenot the only alternatives the Corps of Engineers will be addressing. Examples of alternatives are depicted in Figures 3, 4, 5 and 6. - Groins: Fingershaped structures built perpendicular to the shoreline to trap littoral drift or retard shore erosion. - Revetment: Facings of rock placed on bank or bluff to protect a slope, embankment, or shore structures against erosion by wave action or currents. - Seawalls: Structures of concrete or timber bulkhead, primarily designed to prevent erosion and other damage due to wave action. - Breakwater: Fixed or floating structure that protect a shore area, harbor, anchorage, or basin by intercepting the waves. - Land Use Management: Local government regulations about design and construction including elevation, connections, and location. - Public Theme Park - 6 - EXAMPLE OF BEACH EROSION AND STORM DAMAGE CONTROL •:: Sho-.'f'61314'14_ l.:.: re Line - - g ' — 12 " — I 0. S. /� ' - . 60 /// #'' i ./ R -- - - 18 - -- - - - - - -- - _ -- '.i //� ' moi - - _ - - -- I PAEIF�E OCEAN - - - - GROINS EXAMPLE OF BEACH EROSION AND STORM DAMAGE CONTROL • :•:......./ , 7,2 7 7 /7 7 7/ 7 � BREAKWATERS /,� Jam/ J - -- - - - - - � _. _ -- -18 , i - _ r � � / � �'' . CIFIC OCEAN PA DETACHED OR SUBMERGED BREAKWATERS EXAMPLE OF BEACH EROSION AND STORM DAMAGE CONTROL x.401144/14 0 4/1o.4 .• �1dl.ib.•o, AD ir#41.7.42,4l0 Alb • I A I 4 I reit° . •.-' -; .-''•. •• :: : •• • •:. .si,..4 alk , • 4 r" / ;QUARRY RUN '.."I 1 - • • s.... 40a4 ...• CORE - ..r` �, 1 .01 A. 1r: • , •. .• . PROTECTIVE DIKE EXAMPLE OF BEACH EROSION AND STORM DAMAGE CONTROL Oter.lige" 4414 •Pa4rilllar*. Weivir 4.111k14.ji Irr Antaste .V4 re ftL _ I 0.40411 ,• 1�� S REVETMENT TYPES OF INFORMATION REQUESTED FOR THE RANCHO PALOS VERDES, ROLLING HILLS, CALIFORNIA SHORELINE EROSION AND STORM DAMAGE RECONNAISSANCE STUDY The following is an outline of information that the Corps of Engineers needs to effectively conduct the study. Your cooperation in providing the information outlined will greatly assist the planners. Public involvement and citizen • participation are both vital to the success of the study. 1. Problems and Needs. • What is your view concerning problems and needs of the Rancho Palos Verdes • coastline and in the City of Rolling Hills, and the significance of these problems and needs to the coastal community? - 2. Alternative (Optional) Measures. What are some of your ideas and preferences as to the type of options that might be implemented to control shoreline erosion and storm damage? 3. Project Impacts. Do you have concerns regarding any potential alternative measures and their impacts to the coastline? 14. Storm Damage Information. Provide any information you may have on past storm events and resultant storm damages to the shoreline, coastal improvements, and building . structures. 5. Other Issues or Questions. Please use the issues indicated above as a guide for any presentation you wish to make during the meeting, or mail your responses to the U.S. Army Corps of Engineers, Los Angeles District, P.O. Box 2711 , Los Angeles, California 90053, ATTN: Anna Zacher, Project Manager, Coastal Resources Branch. Name Address Phone • — 11 -