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20201218 Late Correspondence TO: HONORABLE MAYOR & CITY COUNCIL MEMBERS FROM: CITY CLERK DATE: DECEMBER 18, 2020 SUBJECT: ADDITIONS/REVISIONS AND AMENDMENTS TO AGENDA _____________________________________________________________________ Attached are revisions/additions and/or amendments to the agenda material received through Friday afternoon for the Saturday, December 19, 2020 City Council meeting: Item No. Description of Material 1 Letter from Los Angeles County Sanitation Districts Email from: Landslide Mitigation. IMAC Comments Emails from: Brain Thompson; Sheri Hastings; Noel Park; and Sharon Yarber Respectfully submitted, __________________ Emily Colborn L:\LATE CORRESPONDENCE\2020 Cover Sheets\20201219 additions revisions to agenda thru Friday afternoon.docx LOS ANGELES COUNTY SANITATION DISTRICTS Converting Waste Into Resources Mr. Ron Dragoo, City Engineer Public Works Department City of Rancho Palos Verdes 30940 Hawthorne Boulevard Rancho Palos Verdes, CA 90275-5391 Dear Mr. Dragoo: Robert C. Ferrante Chief Engineer and General Manager 1955 Workman Mill Road, Whittier, CA 90601-1400 Mailing Address: P.O. Box 4998, Whittier, CA 90607-4998 (562) 699-7411 • www.lacsd.org December 15, 2020 Ref. DOC 5972522 NOP Response for Portuguese Bend Landslide Mitigation Project The Los Angeles County Sanitation Districts (Districts) received a Notice of Preparation of a Draft Environmental Impact Report (NOP) for the subject project on November 11. The proposed project is located within the jurisdictional boundary of District No.5. We offer the following comments: 1. Sections of the proposed project may impact existing and/or proposed Districts' facilities (e.g. trunk sewers, recycled waterlines, etc.) over which it will be constructed. Districts' facilities are located directly under and/or cross directly beneath the proposed project alignment. The Districts cannot issue a detailed response to or permit construction of, the proposed project until project plans and specification that incorporate Districts' facilities are submitted for our review. To obtain copies of as-built drawings of the Districts' facilities within the project limits, please contact the Districts' Engineering Counter at engj]1eeringgm!J~!:@l~csd.org or (562) 908-4288, extension 1205. When project plans that incorporate our facilities have been prepared, please submit copies of the same to the Engineering Counter for our review and comment. 2. The Districts maintain sewerage facilities within the project area that may be affected by the proposed project. Approval to construct improvements within a Districts' sewer easement and/or over or near a Districts' sewer is required before construction may begin. For a copy of the Districts' buildover procedures and requirements go to www.lacsd.org, under Services, then Wastewater Program and Permits and select Buildover Procedures. For more specific information regarding the buildover procedure, please contact Ms. Danielle Thomas at (562) 908-4288, extension 2754. If you have any questions, please contact the undersigned at (562) 908-4288, extension 2717 or at araza~lacsd.org. AR:ar cc: A. Howard R. Paracuelles D. Thomas Engineering Counter DOC 6000083.005 Very truly yours, ~ft:f Adriana Raza Customer Service Specialist Facilities Planning Department \. Landslide Mitigation, I MAC EIR Scope comments 19 December 2020. The following comments are provided by the I MAC and complement the I MAC Landflow Report included in the agenda items. 1. Geographic scope. 1.1. Expand the project boundary to provide a margin of 180 feet along the easterly (up-slope) side of Burma Road Trail. (Portuguese Bend Mitigation Project, Nov. 2020, Chambers Group, Section 1.2, p. 5 and Figure 1, Project Site Location) Reason: This will include existing retention/catch basins in Paintbrush, Ishibashi and Portuguese Canyons that lie up-slope to the east of Burma Road Trail. Burma Road acts as a dam to some extent for these canyon retention/catch basins. The proposed expansion of the boundary also will include land fissures on and adjacent to Burma Road. 1.2 Clarify/expand the project location boundary on the north-west to conform to the limits of the Portuguese Bend watershed as depicted in the Geo-Logic hydrology report, Drawing 1, plus a margin of plus 100 feet for uncertainties in the watershed delineation. Reference Portuguese Bend Landslide Mitigation, Chambers, Nov. 2020 ("Chambers 2020-11") Section 1.2 and Figure 1. (Hydrology and Hydraulics Evaluation, Geo-Logic Associates, December 9, 2019, Appendix C, City Council page A-76, Attachment 1, Hydrology Map) (See also Chambers, Figure 7, Hydraugers Locations, location A3.) Reason: The northwest boundary lies in an area of complicated geology located between the currently existing outflows of middle Portuguese Canyon and the Kelvin Canyon tributary to Alta mira Canyon. There are unresolved issues concerning the possible existence of important water transfer underground between what appear at the surface to be separate canyon watersheds. The expanded 100-foot margin will allow investigation whether water infiltrating from storm run-off in this expanded area might intrude underground into the landslide either above or below the basal rupture surface of the landslide. This margin will allow the project to address potential sources of artesian water originating at higher elevations that could possibly be extracted by horizontal hydraugers or wells. (See, for example" Geo- Logic, December 2019, Section 5.6.1, Sub-phase lilA-Confirmatory Exploration and Instrumentation, council page A-20.) \ 2. Hydrauger Implementation Include alternative phasing (timing sequence) of construction. Installation of "down-gradient 'relief' drains" currently is proposed only in Phase Ill, sub-phase C, construction. That is, the hydraugers are to be installed near the end of all other construction such as fissure filling and installation of surface-water run-off controls. (Reference Chambers, 2020-11, Sections 1.3 and 1.4, pp. 11-12.) [Geotechnical Evaluation Report, Geo-Logic Associates, December 2019, section 5.6.3, page 17 (Council agenda page A-21). (Geo-Logic Report of 12-2019)] Include within the EIR scope an alternative Phase 1 construction for installation of a limited number of prototype directional hydraugers from the sea shore into the lower landslide to test/verify the viability of the directional hydrauger concept. Advance to Phase I some of the confirmatory exploration and instrumentation, currently specified in section 5.6.1 of the Geologic Report of 12-2019. A similar concept appears in Geo-Logic Report, 12-2019, appendix C, council page C-63 ("In addition, remedy construction is proposed to be completed incrementally and iteratively starting with a pilot test program for directional subsurface drains.") Reason: Directionally drilled hydraugers have never before been tried in the Portuguese Bend landslide. The consultants evaluate them as the largest contributor to stabilization of the landslide. (Geotechnical Report, Geo-Logic Associates, December, 2019, pages 12 -13, Council pages A-16-A-17, including Table 1, estimated factors of safety.) However, their effectiveness is uncertain and the consultants have stated that finding this high-pressure water will be a trial and error process. These hydraugers are high risk and high reward. Prudent risk management concludes that early hydrauger prototypes are essential. Prototypes will demonstrate their effectiveness in extracting significant quantities of water, provide needed information on the composition of the land below the slide plane, prove their survivability and provide the necessary information to plan the implementation of the operational hydraugers in Phase 3. If these prototypes work well then that opens up opportunities to cut back on some of the preventative measures if they are no longer essential. Specifically, there could be re-evaluation of fracture infilling and upper-slope, interception hydraugers, both of which have significant environmental impacts and substantial costs that might be saved. If the prototype lower hydraugers don't work, then the whole program will need to be reconsidered because we already know that all the other preventative measures combined will not achieve the defined success criteria. 3. Back Up Plan for Culvert under PVDS. Include within the scope of the project for EIR purposes the installation of a possible new, second culvert beneath Palos Verdes Drive South in the vicinity of Peppertree Trail on the eastern side of the landslide. Reason: Due to the unresolved questions about the viability of the sole, existing culvert under Palos Verdes Drive South and the viability of the storm-water pathway to that culvert, it would be prudent to include a functional alternative in the project as a backup for EIR purposes. The project as currently proposed relies exclusively upon a single, existing culvert to convey surface storm water from the canyons beneath Palos Verdes Drive South to the sea. That existing culvert is situated on the westerly side of the landslide at the elevation of the historic water channel of lower Portuguese Canyon. The culvert passes beneath the roadbed at a depth about 30 feet below the elevated Palos Verdes Drive road surface. There are well-known engineering questions: (A) Whether the existing culvert under Palos Verdes Drive South is suitable for re-use. (See the attached Elevation Mapping of the Proposed Landflow Retention Basin and PVDS Culvert Area which shows that there may be little to no slope for an effective gravity-flow pathway to the existing culvert.), (B) Whether the pathway for storm water flow from Peppertree Trail to that existing culvert will continue to sink in the future in the same manner that destroyed the 1990 storm drain system, and (C) Whether that existing culvert and the pathway to it will survive for an economically reasonable useful life in the proposed new project. (See, for example, Hydrology and Hydraulics Evaluation, Geo- Logic Associates, December 9, 2019, Conclusions and Recommendations, second bullet point, p. 3 (Council page A-78 at A-79.) If either the existing culvert or the storm-water pathway to the existing culvert were to fail then the entire surface water control system north of the road will fail for lack of any outlet past the roadbed to the sea. If the existing culvert and storm water pathway prove to be unsuitable and if no alternative plan has been evaluated in the current EIR then it might be necessary to incur the delay and expense for a new EIR on a new second culvert. The existing culvert was the target of the 1990 storm drain system. It has been physically stranded because the landslide surface sank along on the pathway of storm water leading from Peppertree Trail to that culvert. The sinking of the land reversed the water flow along the storm water pathway to the existing culvert, thereby stranding that culvert. This failure has created an impounded pool of storm water from Paintbrush and Ishibashi Canyons that seeps into the ground and presumably percolates beneath the roadbed of Palos Verdes Drive South to the ocean. The current project design includes a retention basin to be situated along the storm water pathway to the existing culvert. The retention basin is proposed to manage high volume flows, such as a 50-year or 100-year storm. The proposed retention basin will be subject to the same land-sinking risk along the storm-water pathway that destroyed the 1990 storm drain system. The current EIR could be done with a conceptual design for a second culvert but without a fully detailed engineering design. The concept is to install the new culvert with its inlet (on the north side of the road) at least ten feet lower than the current lowest ground surface north of the road. This would create a vertical margin of ten feet to accommodate future sinking of the land without stranding the new culvert. If the existing culvert and pathway prove to be unsuitable, and an alternative culvert has been included in the first EIR, then it would be easier, cheaper and quicker to perform a supplemental environmental analysis (or possibly a mitigated negative declaration) for a fully engineered design for a new second culvert. 4. Infilling. Expand scope to include possible use of filler materials other than fly ash, such as screened local soil, or imported soil or limestone. Reference Chambers, 2020-11, Section 1.4.1, Construction Phase I, Surface Fracture Infilling and Section 4.9. Reason: A material data safety sheet for fly ash indicates that it is highly alkaline (high pH). The potential impact of such ash filler upon fertility of local soils should be evaluated. 5. Swale/Trail Integration. Much of the proposed swale structure parallels Peppertree Trail. We have suggested as part of a more holistic approach that there is an opportunity to integrate the swales with the trail. Reason: Combining the lower swale with the existing trail would lead to a significantly reduced additional surface area required for the swale ("take" in NCCP parlance) and be a significant environmental and aesthetic benefit. Attachment: Infrastructure Management Advisory Committee Stormwater Subcommittee Report Elevation Mapping of the Proposed Landflow Retention Basin and PVDS Culvert Area 12/14/2020 Summary: The Portuguese Bend Landslide mitigation proposal includes a surface-water retention basin located north of Palos Verdes Drive South (PVDS) that outlets into the culvert under PVDS near Peppertree Lane. PVDS effectively forms a dam blocking storm water runoff from the landflow area to the ocean and the area of the proposed retention basin has been and likely still is sinking. Therefore, I MAC has raised concerns that the current concept of gravity flow of storm water from the proposed retention basin through the PVDS culvert may not be viable. To better understand the situation, the I MAC Stormwater Sub-committee conducted this study to roughly determine the elevation profile of the existing drain pipe running from the intersection of the Peppertree/Sandbox trails, past the proposed location of the surface-water retention basin to the culvert under PVDS and the surrounding area. This report documents the results of the study. The measurements indicate that the local low spot where storm water runoff naturally accumulates, on the connector trail between the Ishibashi Farm Trail and the Peppertree Trail near PVDS, is roughly the same elevation as the inlet to the culvert under PVDS. Additionally, there is a ridge with almost a 30 foot rise in terrain height between the culvert and the identified low point on the pathway to the culvert. While this study was conducted using a smartphone for elevation measurements and should not be considered accurate enough on its own to support engineering decisions, it does provide sufficient evidence that a full elevation survey of the area is needed prior to finalizing the design of this aspect of the landflow mitigation effort. Elevation Measurements: This aerial view of the area shows the locations of elevation measurements taken with a smartphone GPS on the morning of 10/22/20. Points #1, #2, #8, #3, #4 and #6 are at locations on the existing, but no longer functioning, drain pipe that once carried storm water from the landflow area to the PVDS culvert. Point #1 is the PVDS culvert inlet, #8 is a local high point and #4 is a local low point (where the area is covered in silt and the pipe is not visible-presumably buried. Point GPS (tJ§bl Delta H Estimate Elev(~bl Description 1 147 -8 -6 133 On tra il at c u'~te n . Estimate bonom of culvert is 6' l>elow traij . 2 159 -8 151 0 n tra~ tO CIJ~tert , local nig h point. p 1pe bottom IS level 'IJ!h tra il. 3 150 -8 -2 140 C ulven tra~ 30' from ~l)jgs§!JJ T rail intersec t iOn , local lowpoint . BO P IS 2' belowtra1l. 4 142 -8 134 ).s~ to ~.P.R.~ conn ecto r , local [owspot 1n s itt. C a n ~ see pipe he re . 5 162 -8 154 LovJfiat a rea 10n t rail nea r bon om . D id not v.alk th is vJlole trail. 6 199 -8 191 Dra in pipe 90" l>end . Pipe is same level a s tra il . 7 181 -8 -20 153 Lov.ell 's lo>.vspot o n LWOO§!Jl T ra il 8 169 -8 161 Local high point on culvert trail 9 177 -8 169 local low point on traJl heading tov.ard ~ 10 19D -8 182 Blaok •)(" o n tra il in from ~ D ena H = D 1stance fro m Phone antenna to ground vJlen read 1ng Estimate = M}' estimate o f the height differe nce l>etv.een g round and point of interest (usually the pipe bottom). Elevation Measurements Along the Existing Drain Pipe: The profile below shows the elevation change between the go• bend in the drain pipe at the Peppertree Trail (Point #6) and the PVDS culvert (Point #1)_ It indicate s that the contiguous fall line between point #6 and the culvert is a myth and a retention basin located around points #4 and #5 would probably not drain through to the culvert using gravity feed alone, especially if there is more sinking in the area. 200 191 190 ' 180 I 170 1 ::; "' :;.< ~· £ ~ .. ~ Ul 130 120 , ll0 1 100 -~---, 0 2 3 4 5 6 7 8 9 10 Other Points of Interest: Point #7 is the location of an estimated overall low point in the area. The trail in that area is at 173ft MSL. Given all the brush etc., it's very hard to estimate the elevation distance from the trail to the ground below. We estimated about 20ft which would make this spot above the silty area on the trail (Point #4) -153ft vs. 134ft. Points #5 and #9 could be used to support the idea of a culvert under PVDS on the south/east side of the landslide area. However, there is a substantial rise between this area and PVDS which would require a long tunnel or trench to get water under the road from this point. Elevation Measurement Errors: Two sources contributed to errors in the measurement of elevations presented in this report: 1. GPS Error: This study was conducted using a smartphone and an App (ForeFiight) showing GPS altitude in feet above Mean Sea Level. The Smartphone GPS receiver is generally accurate to about 5 meters which does not provide the accuracy necessary to support the elevation profiles given in this report. However, the study was conducted under conditions and in a way that reduces many of the large errors inherent to GPS measurements. GPS receiver errors contributing to the 5 meter accuracy claim are dominated by: Cause of Errors Study Specific Consideration Objects in the field of view of the GPS satellites. The entire study location is open space and there are no trees, buildings etc. that would obstruct the view of the GPS satellites. Changes in GPS satellites in view of the receiver This is minimized because the readings were all taken (active) and their relative position to the receiver. in nearly the same geographic location and within an hour of each other. Differences in modeling (earth ellipsoid, absolute MSL The study measurements compare locations relative to height etc.). each other to create a profile. The results are relative and not dependent on absolute altitude that these modeling inaccuracies affect. To further improve confidence, the GPS elevation of some of the data points was taken twice during the measurement period to confirm that the readings weren't "jumping around". In all cases, measurements taken at the same point minutes apart yielded results within a few feet of each other increasing the confidence of the accuracy of the technique. Measurement 1 Measurement 2 Point 1: 147' MSL 151' MSL Point 2: 159' MSL Point 3: 150' MSL 155' MSL Point 4: 142' MSL 140' MSL Point 5: 162' MSL Point 6: 199' MSL 198' MSL Point 7: 181' MSL Point 8: 169, MSL Point 9: 177' MSL Point 10: 190' MSL 184' MSL Measurement 1: Obtained elevation measurement of each point in the point number order. Measurement 2, About 20 minutes later, after completing all other points, returned to selected points and measured elevation again. Only Measurement 1 points were reported because they were taken within the shortest time span. 2. Vertical Distance Estimate Error ("Estimate" in the data table): Most measurements were taken while standing safely on a trail near the point of interest (such as the bottom of the drain pipe surveyed or a culvert inlet). In many instances, it was necessary to estimate the vertical distance from the trail surface to the point of interest. While care was taken to do this as accurately as possible, the use of proper surveying equipment would enhance the accuracy of the measurements a few more feet. Enyssa Momoli From: Sent: To: Subject: Late carr -----Original Message----- Teresa Takaoka Friday, December 18, 2020 11 :06 AM Enyssa Momoli FW: Please preserve access to the Portugese Bend Reserve From: Brian Thompson <brianthompson3@gmail.com> Sent: Monday, December 14, 2020 11:23 AM To: CC <CC@rpvca.gov> Subject: Please preserve access to the Portugese Bend Reserve Palos Verdes City Council, The Portugese Bend Reserve is one of the most beautiful outdoor spaces in the county of Los Angeles and it's access to a II residents needs to be protected. Please, I beg of you, protect meaningful access to this beautiful outdoor public space. For our children, and future generations, we need this meaningful access to be protected. Thank you, Brian Thompson 1 \ ' Enyssa Momoli From: Ron Dragoo Sent: To: Monday, December 14, 2020 2:19PM Sheri Hastings Cc: CC; Katie Lozano; CityCierk Subject: RE: Portuguese Bend Trail Network Dear Ms. Hastings, Thank you for your comments. Public comments received will be provided to the City Council as late correspondence in advance of Saturday's meeting. Best regards, Ron Dragoo, PE Principal Engineer City Hall is open to the public during regular business hours. To help prevent the spread of COVID-19, visitors are required to wear face coverings and adhere to physical distancing guidelines. Some employees are working on rotation and may be working remotely. If you need to visit City Hall, please schedule an appointment in advance by calling the appropriate department and follow all posted directions during your visit. Walk-ups are limited to one person at a time. Please note that our response to your inquiry could be delayed. For a list of department phone numbers, visit the Staff Directory on the City website. From: Ara Mihranian <AraM@rpvca.gov> Sent: Monday, December 14, 2020 11:10 AM To: Ramzi Awwad <rawwad@rpvca.gov>; Ron Dragoo <RonD@rpvca.gov> Subject: FW: Portuguese Bend Trail Network Please respond. Ara Michael Mihranian City Manager CITY OF RANO!O PALOS VERDES 30940 Hawthorne Blvd. Rancho Palos Verdes, CA 90275 31 0-544-5202 (telephone) 31 0-544-5293 (fax) 1 aram@rpvca.gov www.rpvca.gov Do you really need to print this e-mail? Thi:; H11ilil rnessage contains information belonging to the City of Rand1o Palos Verdes, which may be privile\Jed, confidential and/or protected from cli:;closure. The information is intended only for usc of the individual or entity narncd. Unauthorized diss('mination, distribution, or copyinq is strictly prohibited. If vou received this crnail in error, or me not an intended recipient, please notify the sender irnmediately. Thank you for your assistance and cooperation. From: Sheri Hastings <sherihastings@yahoo.com> Sent: Monday, December 14, 2020 9:14AM To: CC <CC@rpvca.gov>; Katie Lozano <KatieL@rpvca.gov>; CityCierk <CityCierk@rpvca.gov> Subject: Re: Portuguese Bend Trail Network Dear Rancho Palos Verdes City Council Members: As a resident of Portuguese Bend and as a hiker and equestrian in the Portuguese Bend community and as someone who cares deeply about preserving local wildlife, I am writing to express concern over the impacts of the Landslide Mitigation Project as well as the parking and access projects. Any proposed landslide mitigation project impacts us. Parking and access projects impact us. In 1984, the city approved The Trail Network Plan to enhance and maintain the trails. City staff were directed to watch for opportunity to enhance the trail network where other projects are proposed and initiated by staff. The plan included the need for disaster evacuation, firefighting access and other emergency preparedness concerns. The Palos Verdes Loop trail has already been disrupted. Due to erosion and lack of maintenance, new ways of getting through were created by trail users who then encroached on private property, which was later closed off. These factors have led to the loss of full segments of the trail network. We ask that while you plan both the parking and landslide mitigation projects, as well as any future projects, you follow the already adopted Trail Network Plan and look to enhance the trail network at every opportunity. This includes engineering permanent trail routes, canyon crossings, erosion control and access to trails from the Portuguese Bend Community. Access to Jack's Hat and Three Sisters is now at risk, dependent on property owners and conservancy to make a deaL Since the Conservancy took over the land near me there have been more hikers and more large groups of hikers on the trails. Large loud groups of people impacts the nesting birds and other wildlife on the trails. This puts more people on fewer trails which affects us all, the habitat and public safety. Many hikers and bikers are unaware of safe behavior around horses, so forcing all trail users into the same small space is extremely dangerous not only for equestrians, but also for other trail users. And heavy usage it also impacts wildlife along those trails. Expand the trails but have fewer people on them. An expanded and managed trail network is crucial to safety. Please include the 1984 Trails Network plan in your plans. Sincerely, Sheri Hastings Portuguese Bend Resident and Portuguese Bend Trail User 2 Enyssa Momoli From: Sent: To: Cc: Subject: Noel, Ron Dragoo Tuesday, December 15, 2020 1:21 PM Noel Park CC; Ramzi Awwad; imac RE: IMAC Landflow report Thank you for your comments. In addition to the electronic format they have received, they will be provided as late correspondence to the City Council at the Saturday 12-19-2020 seeping meeting. Best regards, Ron Dragoo, PE Principal Engineer City Hall is open to the public during regular business hours. To help prevent the spread of COVID-19, visitors are required to wear face coverings and adhere to physical distancing guidelines. Some employees are working on rotation and may be working remotely. If you need to visit City Hall, please schedule an appointment in advance by calling the appropriate department and follow all posted directions during your visit. Walk-ups are limited to one person at a time. Please note that our response to your inquiry could be delayed. For a list of department phone numbers, visit the Staff Directory on the City website. -----Original Message----- From: Noel Park <noelparkone@gmail.com> Sent: Tuesday, December 15, 2020 11:05 AM To: CC <CC@rpvca.gov>; Ramzi Awwad <rawwad@rpvca.gov>; Ron Dragoo <RonD@rpvca.gov>; imac <imac@rpvca.gov> Subject: IMAC Landflow report The Infrastructure Management Advisory Committee (I MAC) has done extensive work and analysis concerning the proposed landflow mitigation project. They have submitted a comprehensive report to you, raising many credible questions and offering many credible suggestions. I strongly urge you to carefully consider the report. The success of any project is at stake. As a matter of primary urgency, a professional survey should been made of the alignment of the channel from the proposed retention basin to the existing culvert under Palos Verdes Drive South. It seems highly likely that the elevation of the retention basin is lower than that of the culvert. If so, the whole design may be called into question, or extensive grading may be necessary to raise the elevation of the retention basin high enough to achieve gravity flow. The idea that this survey would be left to the construction contractor is extremely dangerous. If the design is found to be infeasible after a construction contract is let, the potential for large cost overruns is clear. Finally, I would like to compliment the IMAC for its diligence and commitment in creating their extremely relevant and valuable report. Sincerely, 1 \ ' Noel Park 6715 El Rodeo Road Rancho Palos Verdes CA 90275 562-413-5147 Sent from my iPhone 2 Enyssa Momoli From: Sent: To: Subject: Dear Members of the I MAC, sharon yarber <momofyago@gmail.com> Saturday, December 12, 2020 1 :51 PM PublicWorks; Katie Lozano; CC Portuguese Bend Landslide Project Thank you for your service to the community and your excellent and comprehensive report. I wish to express my support for the position you have taken that the first order of business should be to install the hydraugers and determine their efficacy before expending large sums of money on other measures which, without effective underground water extraction by the hydraugers, will not be particularly successful. I hope the City Council listens to your recommendation! I also encourage you to vigorously promote efforts by the City to engage with Rolling Hills to eliminate septic systems that surely contribute to the landslide problems. Please include this email as late correspondence for the meeting on December 14th. Sharon Yarber 1 \ .