Rolling Hills City Council
January 10, 2022

The responses suggest stronger demand for traditional ADUs than Junior ADUs, given the large number of respondents indicating they would built or convert an accessory structure, rather than use space within their own homes.

Likely Use of Future ADUs
Respondents were asked how they would use an ADU on their property if they developed one in the future. The responses to this question are important, as the objective of the program is to create rental housing opportunities or opportunities for on-site care givers. Using the ADU as a home office or space for occasional house guests would not accomplish State-mandated housing program goals. Figure C-4 shows the responses to the question.

Figure C-4: Likely Use of Future ADUs (N=192)
The responses indicate that roughly one-third would use the ADU for another household, including 16 who suggested they would rent it to a tenant and 48 who suggested they would use it for a domestic employee or caregiver. The latter statistic is particularly important, as it suggests a potential resource for health care workers, elder care professionals, construction and landscape workers, and others who may work in Rolling Hills but lack the financial resources to live here. Nearly a third of the respondents indicated they would use the ADU for a family For rent to a tenant
(16)
8%
For a family
member
(60)
31%
For
myself
(18)
9%
For an employee or
caregiver (48)
24%
For occasional
visitors (50)
25%
Other (5)
3%
Question: If you had a legal
ADU on your property, how
would you most likely use it?
(192 replies)
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D R A F T F O R H C D R E V I E W
Appendix C: Accessory Dwelling Unit (ADU) Survey Findings Page C-7 member. The family member could be an extension of their own household or a relative or relatives living independently as a separate household. It is worth noting that only a quarter of the respondents indicated they would use the ADU for occasional visitors—historically, this has been the intended use of guest houses in the city.

Use of ADUs as Affordable Housing
Respondents were asked if they would consider limiting the rent on an ADU so that the unit was affordable to a lower income household. The question specifically asked if the respondent would consider a deed restriction that maintained the rent at a reduced rate (such as $1,200/ month for a two-person household) to help the City meet its State-mandated affordable housing requirements. Of the 194 surveys returned, 25 indicated they would consider this and another 20 indicated they might consider this (“maybe”). This represents nearly one-quarter of the total respondents. Another one-quarter indicated they would need more information before deciding.

About 35 percent indicated they would not consider a lower income affordability restriction and 15 percent did not respond.

Figure C-5 shows the responses to this question. The data suggests that an “affordable” ADU program could generate sufficient participation for the City to meet its entire lower-income housing allocation through ADUs.

Figure C-5: Viability of ADUs to Meet Very Low Income Housing Assignment (N=194) For the 98 respondents who answered “Yes”, “Maybe,” or “Need More Information”, the survey asked a follow-up question, which is the maximum length of time the respondent would consider acceptable for an affordability deed restriction. Two respondents did not reply, but the other 96 provided the answers below:
• 20 would consider a 5-year term
• 2 would consider a 10-year term
Yes (25)
13%
Maybe
(20)
10%
Need More Info
(53)
27%
No (68)
35%
Didn't reply (28)
15%
Question: If you
had a legal ADU
on your property,
would you
consider a deed
restriction that
maintained the
rent at a reduced
rate to help the
City meet its
State-mandated
affordable
housing
requirements?
297

D R A F T F O R H C D R E V I E W
Appendix C: Accessory Dwelling Unit (ADU) Survey Findings Page C-8 • 3 would consider a 20-year term
• 17 would consider a deed restriction that ended when they sold the house • 59 were not sure or answered “other”
The responses suggest that long-term deed restrictions (10 or 20 years) and affordability contracts that “run with the land” would have limited participation. Residents are more open to short-term arrangements such as five-year affordability terms, and flexible arrangements that would not encumber the resale of their homes. This is an important consideration in the event a program is established.

Incentives
The final question in the survey asked respondents to select from a menu of possible incentives that might make a rent-restriction on an ADU more acceptable to them. Respondents were invited to select as many of the choices as they wanted. The most frequently selected options are shown in descending order in Figure C-6 below:

Figure C-6: Ranking of Potential Affordable ADU Incentives The most frequently selected option was “nothing.” However, 55 respondents indicated that fee waivers or reductions would be an incentive, and 50 said expedited permitting would be an incentive. Many respondents were also supportive of the idea of rent-restricted ADUs serving local essential service workers such as fire-fighters and teachers. The least popular incentive was assistance in finding a tenant.
0 10
20 30
40 50
60 Question: What
incentives might
make a rent
restriction more
attractive to you?
298

D R A F T F O R H C D R E V I E W
Appendix C: Accessory Dwelling Unit (ADU) Survey Findings Page C-9 Other Comments
The survey provided an opportunity for residents to make general open-ended comments on ADUs and housing issues in Rolling Hills, as well as the factors the City should consider as new ADU policies and regulations are developed. Feedback was provided by 52 of the respondents.

This is summarized below.

Most of the open-ended comments expressed negative views about ADUs and their potential impacts on the character of Rolling Hills, as well as concerns with State housing mandates and the erosion of local land use control. Numerous concerns were raised about safety, security, and privacy. There were also concerns expressed about noise, parking, traffic, evacuation capacity, and impacts on the community’s rural, equestrian feel. Some respondents expressed concerns that they would not be able to choose their own tenants if they created an ADU or would be penalized if they created an ADU but did not rent it. Questions were also raised about property tax impacts, septic system impacts, and whether tenants would pay association dues and have access to RHCA facilities.

There were also supportive comments, particularly from persons interested in creating ADUs for aging parents, or for themselves to age in place while renting out their primary home. Several respondents indicated an interest in renting space to a care giver. One respondent suggested prioritizing rentals to employees of the RHCA. Some respondents expressed their support for the idea of using the school property to meet affordable housing needs rather than relying on ADUs.

Survey
A copy of the survey mailed to residents follows this page. 299

D R A F T F O R H C D R E V I E W
Appendix C: Accessory Dwelling Unit (ADU) Survey Findings Page C-10 300

D R A F T F O R H C D R E V I E W
Appendix C: ADU Survey Report Page C-11
City of Rolling Hills Accessory Dwelling Unit Survey
October 2020
Dear Resident:

Please take a few minutes to complete this survey about Accessory Dwelling Units (ADUs) in Rolling Hills. Your
responses will help us understand community goals and
concerns and will be used to develop new policies for
consideration by the Rolling Hills Planning Commission and City Council.

State law requires that all cities and counties allow ADUs, provided they meet certain standards. Some of the
potential benefits of ADUs include rental income for
homeowners, on-site living space for caregivers or
household employees, and accommodation of extended
family (adult children, parents, etc.). ADUs can also help residents “age in place,” particularly as homeowners need more care or assistance.

The City’s objective in carrying out this survey is to
determine the level of interest in ADUs among Rolling Hills residents and evaluate their potential to meet local housing needs. Like all cities in California, Rolling Hills is required by State law to provide for its “fair share” of the region’s housing needs, including low- and very low-income
households. ADUs provide a way to do that without
significantly changing the character or appearance of the community. Some communities even provide special
incentives for homeowners who rent ADUs at reduced rates to very low-income households, including household
employees and local essential service employees.

The deadline for returning your survey is November 20,
2020. Please use the enclosed postage-paid envelope to
return the survey to City Hall by this date. If you would prefer to complete the survey on-line, please visit
www.surveymonkey.com//rollinghillsADUsurvey.

Please do not include your name or address on the survey as the intent is for all responses to be anonymous. If you have questions about the survey or about ADUs in Rolling Hills, please call Meredith Elguira at (310) 377-1521.

What are ADUs and JADUs?
Accessory Dwelling Units (ADUs) are
sometimes referred to as “in-law
apartments” or “second units.” They are
small independent dwelling units that exist
on single family properties, either in a
detached structure or as part of the
primary structure with a separate
entrance. ADUs include a bedroom or
sleeping area, a bathroom, and cooking
facilities.

Rolling Hills has adopted specific zoning
standards for ADUs as required by state
law. The maximum allowable size is 850
square feet for a studio or one-bedroom
and 1,000 square feet for a two bedroom.

Other standards also apply.

Junior Accessory Dwelling Units (JADUs)
are a type of ADU created by converting
existing living space inside a single-family
home (usually a bedroom) to a separate
living space. They have a maximum size
of 500 square feet. JADUs may have their
own kitchenette or bathroom, or they may
share the facilities in the primary
residence.

State law allows a property to have both
an ADU and a JADU if certain
requirements are met.
301

D R A F T F O R H C D R E V I E W
Appendix C: ADU Survey Report Page C-12
Thank you for taking the time to complete the survey!
Accessory Dwelling Unit Survey

1. Does your property include any of the following features? (circle all that apply) A. A legally permitted Accessory Dwelling Unit (ADU) with kitchen, bath, and separate entrance? B. A guest house, pool house, casita, barn or other outbuilding that has heat and plumbing? _____ Check here if the space has a kitchen or other cooking facilities C. A space inside your house with a separate entrance from outside and independent living quarters, including a bedroom/ sleeping area and bathroom?
_____ Check here if the space also has its own kitchen or cooking facilities D. Another space within your house that could easily be converted into an accessory dwelling unit?

2. If you circled one of the choices above, how is the space currently used? (If you circled more than one choice, please provide a response for each applicable space on your property. Use the blank line to the right of each choice below to describe the space you’re referring to).

A. It is occupied by a tenant paying rent ____________________________________ B. It is occupied by a family member or long-term visitor who is not part of my household ___________ C. It is occupied by a caretaker or household employee(s) ____________________________________ D. It is used occasionally by guests or visitors ____________________________________ E. My own household uses the space ____________________________________ F. The space is currently not occupied by anyone, or is used for storage ___________________________ G. Not applicable
2A. About how large is the space of each applicable feature from Question 1 (in square feet)? (please skip question if not applicable)
__________________ ___________________ _________________ 2B. If rent is collected for the space, what is the monthly amount? (if multiple spaces are rented, please indicate the rent for each area). (Please skip question if not applicable) __________________ ___________________ _________________ 302

D R A F T F O R H C D R E V I E W
Appendix C: ADU Survey Report Page C-13

3. If you have space on your property occupied by a household other than your own, please circle the category in the table below that most closely matches their annual income based on the number of persons in their household, if you know that amount. Recent data from the US Census indicates that 16 percent of Rolling Hills households have annual incomes below $50,000. ADUs (or potential ADUs) may provide a resource for these households. If Question 3 does not apply to your property, please skip to Question 4.

Number of Persons in the Household (for other occupants only, not your own household) 1 2 3 4 5 6
Annual Income
$23,700 or less $27,050 or less $30,450 or less $33,800 or less $36,550 or less $39,250 or less $23,700-
$39,450
$27,050-
$45,050
$30,450-
$50,700
$33,800-
$56,300
$36,550-
$60,850
$39,250-
$65,350
$39,450-
$63,100
$45,050-
$72,100
$50,700-
$81,100
$56,300-
$90,100
$60,850-
$97,350
$65,350-
$104,550
$63,100 or
more
$72,100 or
more
$81,100 or
more
$90,100 or
more
$97,350 or more $104,550 or
more

4. If you don’t currently have a legal ADU on your property, would you consider developing one? (circle one answer)
No Probably Not Not Sure/ Neutral Maybe, but not at
this time Yes
4A. If you answered A, B, or C, what are the reasons? (Circle All that Apply) No Interest Cost Loss of Privacy Permitting
Process
Don’t Want to
Deal with
Tenants
No Space
Other (please explain below)_____________________________________________________ ____________________________________________________________________________

5. If you decided to build an ADU on your property, where would it be located? (circle one) New
detached
structure
on my
property
Conversion of an
existing accessory
building on my
property (e.g., guest
house, barn, etc.)
An addition
to my house
Conversion of space
already within the
footprint of my house
Not sure
I would not add
an ADU on my
property

6. If you had a legally approved ADU on your property, how would you most likely use it? (circle one) For rent to
a tenant
For a family member
For myself For a household
employee of caregiver
For occasional
visitors
Other
303

D R A F T F O R H C D R E V I E W
Appendix C: ADU Survey Report Page C-14

7. If you had a legally approved ADU on your property, would you consider a deed restriction that maintained the rent at a reduced rate (for example $1,200/month, which is considered the threshold for an “affordable” housing unit for a two person very low income household) to help the City meet its State-mandated affordable housing requirements? (circle one) A. Yes
B. Maybe
C. I would need more information first
D. No
7A. If your answer to Question 7 was A-C, what would be the maximum length of time you would consider for the rent restriction? (circle one)
A. Five years
B. 10 years
C. 20 years
D. Until I sell the house
E. Not Sure
F. Other _______________________
7B: What incentives might make a rent restriction more attractive to you? (circle all that apply) A. No parking requirement
B. Reduced (or no) permit fees
C. Expedited permit processing
D. Assistance in finding a tenant
E. Rent supplement for the tenant
F. Local tenant (e.g., school teacher,
fire fighter, child care worker)
G. Senior tenant
H. Low-interest financing to create the ADU
I. Permission to build a unit larger
than 1,000 square feet
J. Nothing
K. Other _______________________

8. To ensure that we are hearing from a cross-section of the community, please tell us a little about you:

How Long Have You
Lived in Rolling Hills?
Less than 10 years
10-19 years
20-29 years
More than 30 years
Circle one choice in each box
Are you a Homeowner
or a Renter?
Homeowner
Renter
Age
Under 35
35-49
50-64
65+
How Many People Are
in Your Household?
1 4
2 5
3 6 or more

9. Please share any concerns you may have about ADUs in Rolling Hills, or factors you’d like us to consider as new ADU policies and regulations are developed:
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1/10/2022
1 2021-2029

ROLLING HILLS HOUSING ELEMENT
City Council Hearing
JANUARY 10, 2022
Background
 Required element of every General Plan
 Expresses City policies for housing
conservation, housing production, and
affordable housing
 Contents established by State law—many
prescriptive statutory requirements
 Subject to certification by State HCD
 Failure to comply can lead to loss of
eligibility for funds and legal risk
 Updated on eight-year cycle
Fifth Cycle:

Oct 2013 – Oct 2021
Sixth Cycle:

Oct 2021 – Oct 2029
305
1/10/2022
2 Timeline
 5th Cycle Element adopted in February 2014 -- not certified by State  City amended Element in 2020-2021 in response to HCD objections  Other cities were preparing 6th Cycle elements during this time  Amended Element certified in July 2021
 6th Cycle Element prepared in August-November 2021
 6th Cycle adoption deadline was October 15, with 120-day “grace period” (February 12, 2022)
Status of Elements in LA County
(1/5/22)
9 25
42 12
0 5 10 15 20 25 30 35 40 45
Nothing Submitted to HCD Yet
Draft Currently Under Review
Draft Reviewed and Found Non-Compliant
Adopted, Compliance Determination Pending
306
1/10/2022
3 Adoption Process
City prepares
HCD Draft,
circulates draft
for 30 days
(plus 10 days to
respond to
comments)
City submits
Draft to HCD.

HCD has 90 days
to issue
comments (per
AB 215).

City amends HCD
Draft in response to
HCD comments
(iterative process with
HCD)
City adopts Draft
(Planning Commission
and City Council
hearings, plus CEQA
review)
Amended Draft
submitted to HCD.

HCD has 60 days to
make compliance
determination.

Further
amendments if
non-compliant
Finding of
Compliance
Contents
Evaluation of
Prior Element
Needs
Assessment
Constraints
Analysis
Sites Analysis
Resources
Analysis
Affirmatively
Furthering
Fair Housing
Goals, Policies, Programs, and Objectives
307
1/10/2022
4 Regional Housing Needs Allocation
(RHNA)
8 5 20
9 5
11 10
5 0
5 10
15 20
25 30
35 40
45 50
Very Low Low Moderate Above Moderate
2005-2021
Cycle 6
2021-2029
Cycles 4+5
• City must plan for 60%
increase in number of
units relative to last
Element
• Number of “lower
income” units has
increased by 123%
Meeting the RHNA
 5 new market rate single family homes (3 already approved)  16 units of affordable multi-family housing on Rancho Del Mar site  5 accessory dwelling units per year (plus 9 already approved)  City has provided data demonstrating that at least 13 of these ADUs will be affordable to lower-income households
 Units created and occupied by family members or household employees for no rent or reduced rent may be counted as long as they can be documented by the City
308
1/10/2022
5 Data on ADU Rentals
Citation: SCAG survey of ADU
rents in coastal LA County
indicates 15% were affordable
to extremely low income HH
Citation: Craigslist ads for ADUs on
PV Peninsula indicates several
units at $1,200 or less
Program Recommendations
 Many recommendations are carried over from 5th Cycle
 State-mandated Zoning code amendments
 Ongoing activities (code enforcement, permit streamlining)  New recommendations relate to:
 Incentives for ADUs
 Record-keeping to track ADUs
 Education and outreach about ADUs
 Amend RHCA guidelines to address ADUs
 Fair housing enforcement
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1/10/2022
6 Review Process for HCD Draft
 Document was published December 3, 2021
 Notice was provided to every household through Blue newsletter  Notices were sent to housing advocacy groups/ supportive service providers
 Tribal notification was conducted (for CEQA)
 Planning Commission held hearing on December 16, 2021  30-day review period ended on January 2, 2022
 No substantive comments on the Housing Element were received Next Steps
 January 11: Transmit draft to HCD for expedited review  Receive HCD comments and revise Element
 Release Revised Draft and CEQA document
 Return to Planning Commission and City Council for adoption  By February 12 if possible
 Otherwise, by March-April 2022
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7 2021-2029

ROLLING HILLS HOUSING ELEMENT
City Council Hearing
JANUARY 10, 2022
THANK YOU!
311
Agenda Item No.: 9.A
Mtg. Date: 01/10/2022
TO: HONORABLE MAYOR AND MEMBERS OF THE CITY COUNCIL
FROM: ELAINE JENG, CITY MANAGER
THRU: ELAINE JENG P.E., CITY MANAGER
SUBJECT: RECEIVE AND FILE THE FINAL FEASIBILITY STUDY FOR SEWER

CONNECTIONS ALONG PALOS VERDES DRIVE NORTH
(WILLIAMSBURG AND MIDDLERIDGE LANE) AND PROVIDE
DIRECTION TO STAFF.

DATE: January 10, 2022
BACKGROUND:

At the May 24, 2021 City Council meeting, two residents reported that they plan to construct sewer main lines along Williamsburg Lane and Middleridge Lane to serve the residents along these streets.

The residents also noted that their proposed lines need an outlet. Since the City secured approvals from the Los Angeles County Sanitation District to discharge effluent from 235 homes within city limits to the County's treatment facility, the residents requested the City to allow the effluent from their proposed lines to discharge to the new 8" sewer main along Rolling Hills Road. In May, the residents expressed that the design of the 8" could be expanded to include a future connection to their proposed lines. The design of the 8" sewer main is complete as of November 2021. As a part of the design process, the completed plans are being reviewed by adjacent agencies for comments.

In response to the residents' request, in June 2021, the City Council engaged Willdan Engineering (Willdan) to provide a feasibility study possible connections from the residents' proposed sewer lines to the 8" sewer main along Rolling Hills Road. The scope of work for the feasibility study also included analyzing upstream areas that could connect to the residents' proposed sewer lines in the future.

DISCUSSION:

The feasibility study recommended three options to discharge the effluent from the residents' proposed sewer lines. Option 1 includes the Middleridge line discharging to an existing Los Angeles County trunk line along Crenshaw Boulevard via gravity flow. Option 2 includes Williamsburg line discharging via gravity flow to Rolling Hills Estates existing pump station at Dobbin Lane. Option 3 includes Middleridge and Williamsburg lines discharging to the 8" sewer main along Rolling Hills Road via a pump station. There is a low point along Palos Verdes Drive North (due to the existing utilities lines underground), between the extension of the Middleridge and Williamsburg streets.

Running sewer lines through the low point would result in the sewer line having only approximately three to four fee of cover (dirt above the pipeline). Design standards call for the sewer line to be much 312
deeper to avoid impacts from surface activities.

Each option excluded the cost of the sewer connection from Middleridge Lane North and Williamsburg Lane to Palos Verdes Drive North. This cost is assumed to be included the residents' cost of installing the private sewer lines. Willdan noted that there are potential constraints on Palos Verdes Drive North that went beyond the scope of work of the feasibility study and would need to be analyzed in the design phase to verify that option 1 and option 2 are viable.

Willdan worked with the City's Project Manager Alan Palermo to develop estimates of probable cost for each option.

Option 1: $1,352,284
Option 2: $1,012,363
Option 3: $1,703,300
Willdan also analyzed the effluent discharge of the homes located upstream of the residents' proposed limits for the sewer lines. Based on the number of homes, the proposed size of the residents' pipes, and topography, Willdan concluded that the upstream effluent can be accepted in the downstream proposed lines and that the topography will allow the upstream effluent to be accepted via gravity flow.

Attached to this report is the final feasibility study.

FISCAL IMPACT:

The cost of the feasibility study was $14,588. This amount was budgeted in the Utility Fund for FY2021-2022.

RECOMMENDATION:

Receive and file study and provide direction to staff.

ATTACHMENTS:

RH Sewer Feasibility Study Ph III 09-3-2021-Complete (1).pdf 313

CITY OF ROLLING HILLS
SEWER SERVICE FEASIBILITY STUDY – PHASE III

MIDDLERIDGE LANE AND WILLIAMSBURG LANE
Prepared Under the Supervision of
Tyrone Peter, P.E.

R.C.E. No. 81888
Willdan Engineering
2401 E. Katella Avenue, Suite 300
Anaheim, California 92806
(714) 940-6300
September 2021

FINAL SUBMITTAL
314

TABLE OF CONTENTS
Introduction…………………………………………………………………………………… 1
Project Area…………………………………………………………………………………... 3
Methodology………………………………………………………………………………….. 6
Sewer Pipe Capacity Analysis…………………………………………………………….. 7 Flow Coefficients…………………………………………………………………………….. 8
Flow Generation Analysis………………………………………………………………….. 9
Option 1……………………………………………………………………………………….. 10
Option 2……………………………………………………………………………………….. 12
Option 3……………………………………………………………………………………….. 15
Other Options………………………………………………………………………………… 17
Conclusions………………………………………………………………………………….. 17
Appendices
A Project Location Map
B Project Area Map and Conveyance Options Map
C Conveyance of Upstream Parcels to Rolling Hills Road
D As-Built Information
E Zoning Information
F LACDPW Sewer Capacity Policy
G LACDPW Flow Generation Coefficients
H Google Earth Image
I Option 1 Exhibits
J Option 2 Exhibits
K Option 3 Exhibits
315
1 INTRODUCTION
The City of Rolling Hills, CA (“City”) has retained Willdan Engineering to conduct research and analysis to study the feasibility of providing sanitary sewer service to two streets located west of City Hall; Middleridge Lane and Williamsburg Lane (See Project Location Map - Appendix A).

Properties on these streets, and the area upstream thereof, are not currently served by sanitary sewer lines. Willdan has performed three separate studies over the last 13 years to study the general nature of the sewer service potential in the area, however this study is specific to the Middleridge Lane and Williamsburg Lane streets.

The three previous studies are:

City of Rolling Hills Sewer Feasibility Study, September 2008 (2008 Study):

This study analyzed gravity sewer systems, Low Pressure Sewer (LPS) systems and combination gravity/LPS to serve the City.

Sewer Feasibility Study Including City Hall and Tennis Court Site” (Phase I), October 2018:

This study conducted concept level research and engineering feasibility evaluation regarding the potential of connecting the Project Area (City Hall, POA building, and the tennis court site, and upstream properties) to existing downstream sanitary sewer systems.

Sewer Feasibility Study Including City Hall and Tennis Court Site” (Phase II), May 2020:

This study involved the preparation of a Sewer Area Study and preliminary engineering plans for the extension of the sewer in Rolling Hills Road to serve the City Hall and Tennis Court Site. The documents prepared were submitted to and approved by:

City of Rolling Hills Estates
City of Torrance
Los Angeles County Department of Public Works (LACDPW)
County Sanitation Districts of Los Angeles County (CSD) 316
2 The three studies included research and conceptual level design of the sewer drainage of parcels south of Palos Verdes Drive North (PVDN), upstream of City Hall. It was noted in all three studies that providing sewer service to these properties may require pumps and easements due to topographic constraints. The 2008 report also studied a LPS to provide sewer service in this area.

Subsequent to the Phase II Study, the City contracted with another consultant to produce construction documents for the extension of the sewer in Rolling Hills Road to serve the City Hall and Tennis Court site. The City now seeks to study providing sanitary sewer to Middleridge Lane and Williamsburg Lane. The project proposal included the study of two potential conveyance options; convey northwest within PVDN to a trunk sewer in Crenshaw Boulevard; or convey southeast within PVDN to the sewer being constructed within Rolling Hills Road. During the performance of the study a third conveyance option was studied; convey north across PVDN to the existing sewer within Dobbin Lane.

In the performance of this study as-built information for downstream sewers was obtained and evaluated to determine conveyance feasibility. Topographical information was based on available GIS topography information and Google Earth data. Sewer flow generation rates were also calculated to evaluate downstream pipe capacity. The evaluation performed is concept level as limited topographic information was available and further design and evaluation will be required to produce preliminary engineering designs. Design concepts are presented which contain both gravity flow and pumping conditions; LPS systems were not considered in this study as they were thoroughly addressed in the 2008 Study.
317
3 PROJECT AREA
The project area for this study is Middleridge Lane and Williamsburg Lane. However, as sewer design must account for future conditions, the area of Rolling Hills upstream of these two streets was also evaluated. The overall project area is shown on the Project Area Map in Appendix B.

The 2008 study determined sewersheds within the Project Area based on topography and this same information was utilized for this study. The conveyance options are also shown on the Project Area Map and in Figure No. 1 below as follows:

Option 1: convey northwest within PVDN to a trunk sewer in Crenshaw Boulevard Option 2: convey north across PVDN to the existing sewer within Dobbin Lane Option 3: convey southeast within PVDN to the sewer being constructed within Rolling Hills Road Conveyance Options
FIGURE NO. 1
318
4 As mentioned above, the area upstream of Middleridge Lane and Williamsburg Lane was also researched and evaluated. This area was previously included in the 2008 Study and the Phase II Study. Utilizing the information from the 2008 Study, Sewer Areas 9, 13, 18 were evaluated.

The 2008 Study evaluated Area 9 as being pumped south to Crest Road to keep all sewer lines within existing rights of way. Areas 13 and 18 (portion) convey by gravity flow to Middleridge Lane and Williamsburg Lane respectively. For the subject study, to be conservative, Area 9 was also evaluated as conveying north into Area 18, to agree with the topography, even though right-ofway does not exist between these two areas. This conveyance would require an easement, but would eliminate the need for pumping back to Crest Road. For the scope of the subject project, what is required is that the sewer flow from Area 9 is accounted for in the sewer modeling, not whether it is in right-of-way or in an easement. Also, for the subject study, the upper portion of Area 18 was assumed to flow into Area 17, based on the topography and the conveyance path to Rolling Hills Road, which concurs with the Phase II Study.

It should be noted that the Phase II Study evaluated the upstream area of Areas 9, 10, 13, 16, 17, 18, 19, and 20 as tributary to Rolling Hills Road. A Will-Serve Letter was obtained from the Sanitation District of Los Angeles County and a Sewer Area Study was prepared and approved by LACDPW for the conveyance of this much larger area to Rolling Hills Road. Therefore, the subject study evaluated the potential of conveying flow from portions of Areas 9, 13 and 18, upstream of Middleridge Lane and Williamsburg Lane, to Portuguese Bend Road / Rolling Hills Road (see Figure No. 2 below and in more detail in Appendix C). This conveyance pattern agrees with the Phase II Study and would minimize the amount of flow to the downstream connection points. To be conservative, the analysis also evaluated the flow from Areas 9, 13 and 18 (portion) conveying to PVDN and to the connection points in Options 1, 2, and 3. It is noted that although the conveyance to Portuguese Bend Road is feasible, engineering challenges would need to be addressed including shallow sewers, deep manholes, and the potential need for pump stations. 319
5 Area Upstream of Middleridge Lane and Williamsburg Lane FIGURE NO. 2
320
6 METHODOLOGY
This study performs analyses of the sanitary sewer lines assuming full build out conditions. The model determines all areas conveying to the sanitary sewer line and analyzes the hydraulic characteristics of the flow in the pipes. To perform this analysis, the following information was required:

1. Information on the existing sewer: pipe size, slope, and lengths

2. Information on the zoning and land use of the contributing parcels

3. Information on the contributing parcel sizes
Existing information was obtained through research of available as-built information online and contained within the referenced studies. Available relevant as-built information from LACDPW is contained in Appendix D.

Zoning and Land Use information was obtained by utilizing topographical, land use, zoning, and parcel information available online, in GIS databases and from the referenced studies. (See Appendix E)
Information obtained was utilized to determine the waste flow generated by the properties. The flow generated by the parcels is a multiplication of the parcel acreage and a zoning flow coefficient for existing development. Discussion on the flow coefficients is contained in a following section of this report. Once the generated flow is determined, it is added to the sewer system proceeding upstream to downstream. The pipes between successive manholes are then analyzed to determine the hydraulic characteristics. This is accomplished by utilizing the as-built information obtained in Item 1 and performing hydraulic calculations in accordance with LACDPW requirements.
321
7 The hydraulic modeling begins at the upstream end of the system and proceeds downstream.

Flows from the contributing parcels are accumulated at the manholes where they enter the system. Each pipe segment along the critical path is then hydraulically analyzed. LACDPW Capacity Policy (See Appendix F) defines capacity of the sewer mainline as:
< 15” diameter ½ full = 100% Capacity (flow depth / pipe diameter) > 15” diameter ¾ full = 100% Capacity (flow depth / pipe diameter) All pipes in the system are 8” diameter pipes, therefore the design capacity is ½ full. Each pipe segment was then compared to the 100% capacity (1/2 full) value to determine its’ relative capacity, i.e., < 100% (< ½ full) is under capacity and > 100% (> ½ full) is over capacity. Segments that are over 100% capacity would be required to have the pipe size increased to bring that segment under capacity.

SEWER PIPE CAPACITY ANALYSIS
As mentioned previously, the design capacity is ½ full for pipes < 15” in diameter. LACDPW requires that the pipe flow be calculated by using Kutter’s formula, which is stated below:

Q = AC(RS)^(1/2)
C = 41.65 + (0.00281/S) + (1.811/n)
1 + (41.65 + 0.00281/S) * n/(R)^(1/2)
Where Q = Discharge (cfs)
C = Chezy coefficient
A = Flow Area (sf)
R = Hydraulic Radius (ft)
S = Pipe Slope (ft/ft)
n = 0.013
322
8 It is noted that for ½ full, R = Diameter / 4
Utilizing Kutter’s Formula, the analyses determined the Design Capacity for each pipe segment.

This was calculated in a spreadsheet and is included on each exhibit.

FLOW COEFFICIENTS
Information regarding flow generation coefficients and rates was obtained from the LACDPW.

The LACDPW table (See Appendix G) provides information on Average Daily Sewage Flows for Various Occupancies and Zoning Coefficients based on zoning. The upper table values are gallons/day and must be multiplied by 2.5 to obtain peak flow values. The lower table values are in cfs/acre and are multiplied by the appropriate acreage to achieve peak flows. The parcels in the project area are large. Per the City of Rolling Hills zoning information in Appendix E, the parcels in the study area are RAS-1, minimum lots size 1 acre, and RAS-2, minimum lot size 2 acres. The zoning information for the City of Rolling Hills Estates in Appendix E indicates the residential parcels in the study area are Residential Low Density (20,000 sq. ft.). LACDPW zoning information in Appendix E indicates R-A-20000, however, to be conservative, this area is analyzed as 12,000 sf lot size. For the Phase II Study, LACDPW indicated that the zoning coefficients to be used for large residential lots is to be based on a proration of 0.001 cfs/ac as follows:

Rolling Hills:

RAS-1, minimum lot size 1 acre (43,560 sf):

Coefficient = 0.001 cfs/ac x (43,560/43,560) = 0.001 cfs/ac RAS-2, minimum lot size 2 acres (87,120 sf):

Coefficient = 0.001 cfs/ac x (43,560/87,120) = 0.0005 cfs/ac 323
9 Rolling Hills Estates:

Low Density Residential (1 acre) (43,560 sf):

Coefficient = 0.001 cfs/ac x (43,560/43,560) = 0.001 cfs/ac Low Density Residential (20,000 sf):

Coefficient = 0.001 cfs/ac x (43,560/20,000) = 0.0022 cfs/ac Los Angeles County:

Low Density Residential (10,000 sf):

Coefficient = 0.001 cfs/ac x (43,560/12,000) = 0.0036 cfs/ac

FLOW GENERATION ANALYSIS
The calculations for the flow generated by each area are shown in the tables on the Study Exhibits 1, 2 and 3 in Appendices I, J, and K. The calculations proceed from upstream to downstream.

The cumulative flows are added to obtain the flow within each pipe segment. This flow is then compared against the Design Capacity Flow (1/2 full) to determine the % of Design Capacity. As stated previously, < 100% (< ½ full) is under capacity and > 100% (> ½ full) is over capacity.

Having outlined the methodology utilized to evaluate the sewer capacities, each conveyance option is discussed further below.
324
10 OPTION 1 (SEE APPENDIX I)
FIGURE NO. 3
Option 1 (see Figure No. 3 above) studied the conveyance of flows northwest within PVDN to a trunk sewer in Crenshaw Boulevard. A review of as-built information reveals that a gravity system exists in PVDN approximately 400 feet west of Middleridge Lane. The topography in the area was evaluated using GIS and Google Earth elevation data to determine the feasibility of connecting to this sewer. The upstream segments of the PVDN sewers are at shallow slopes and the downstream segments closer to Crenshaw Boulevard are steeper, which allows for the potential of lowering the sewer if needed to gain elevation.

The Study Exhibit 1 shows the areas tributary to this conveyance option. Specifically, the areas and respective zoning analyzed are:

Area 9 – RAS-2 = 67.6 ac
Area 13 (yellow) – RAS-2 = min. lot size 2 ac = 176.8 ac Area 13 (green) – RAS-1 = min. lot size 1 ac = 19.3 ac
Area 18 (portion, pink) - RAS-2 = min. lot size 2 ac = 94 ac 325
11 Area 18 (orange) – RAS-1 = min. lot size 1 ac = 28.5 ac D/S area south of PVDN (LA County) = min. lot size 12,000 sf = 55.6 ac D/S area north of PVDN (City of Rolling Hills Est.) = min. lot size 20,000 sf = (5.7 ac + 6.2 ac = 11.9 ac)
D/S area north of PVDN (City of Rolling Hills Est.) = Institutional = 2.8 ac These areas were modeled to determine the conceptual flow rates within the pipes and to evaluate the sewer flow relative to Design Capacity. A preliminary plan and profile was also prepared to conceptually design the horizontal and vertical alignment of the sewer. As mentioned previously, the downstream portions of the PVDN sewer are at steeper slopes. In order to gain sewer depth, the analysis assumes reconstructing portions of the existing sewer with 8” VCP at shallower slopes. The requirement for this must be determined by obtaining field survey information and utility location information. However, for the scope of this project, reconstructing the existing sewer segments is considered acceptable to evaluate feasibility. Using the conceptual design profile, the analysis indicates that the sewer line has capacity to convey the flow. Using the GIS/Google Earth information available indicates that the sewer would be as shallow as 4.40’, which may not be acceptable. However, this should be further evaluated with site specific topographical survey information.

A review of the GIS topography indicates low points on PVDN east and west of Middleridge Lane.

Google Earth reveals that drop inlets exist on PVDN east of Middleridge Lane. Google Earth does not indicate drop inlets west of Middleridge Lane, however it is reasonable to assume that a culvert exists in this area to convey the flow in the low point beneath PVDN. Location and elevation data for these drainage facilities, as well as detailed surface topographic survey and utility determination/mapping must be provided to further assess the feasibility of this option. 326
12 OPTION 2 (SEE APPENDIX J)
327
13 FIGURE NO. 4
(see Figure No. 4 above) A review of as-built information reveals that a gravity system exists in Dobbin Lane approximately 500 feet north of Middleridge Lane. The topography in the area was evaluated using GIS and Google Earth elevation data to determine the feasibility of connecting to this sewer. This sewer is at lower elevation than the study area and gravity connection to this sewer is feasible. However, this sewer conveys to the Lariat Lane Pump Station and adding flow to this pump station must be studied and the impact to the pump station would have to be evaluated. Due to the conveyance to the Lariat Lane Pump Station, two scenarios were modeled under Option 2, Study Options 2A and 2B. Option 2A modeled the following areas and respective zoning as tributary to the system:

Area 13 (green) – RAS-1 = min. lot size 1 ac = 19.3 ac
Area 18 (orange) – RAS-1 = min. lot size 1 ac = 28.5 ac D/S area north of PVDN (City of Rolling Hills Est.) = min. lot size 20,000 sf = (5.6 ac + 3.5 ac + 4.4 ac = 13.5 ac)
Option 2A assumes the flows upstream of Middleridge Lane and Williamsburg Lane are conveyed to Portuguese Bend Road and are not tributary to the sewer system conveying to Lariat Lane Pump Station (see Appendix C). Under this scenario, the downstream system has capacity for this conveyance. Regarding the Lariat Lane Pump Station, the as-built information indicates that the pump is rated to deliver 160 gpm at 60’ TDH. The model indicates that the flow conveyed to the pump station is 0.078 cfs = 35 gpm. Under this conceptual design, the pump would have the capacity for this added flow.
328
14 Option 2B modeled the following areas and respective zoning as tributary to the system:

Area 9 – RAS-2 = 67.6 ac
Area 13 (yellow) – RAS-2 = min. lot size 2 ac = 176.8 ac Area 13 (green) – RAS-1 = min. lot size 1 ac = 19.3 ac
Area 18 (portion, pink) - RAS-2 = min. lot size 2 ac = 94 ac Area 18 (orange) – RAS-1 = min. lot size 1 ac = 28.5 ac D/S area north of PVDN (City of Rolling Hills Est.) = min. lot size 20,000 sf = (5.6 ac + 3.5 ac + 4.4 ac = 13.5 ac)
Option 2B assumes the flows upstream of Middleridge Lane and Williamsburg Lane are conveyed to this sewer system and conveying to Lariat Lane Pump Station. Under this scenario, the downstream system has capacity for this conveyance. Regarding the Lariat Lane Pump Station, the as-built information indicates that the pump is rated to deliver 160 gpm at 60’ TDH. The model indicates that the flow conveyed to the pump station is 0.247 cfs = 111 gpm. Under this conceptual design, the pump would have the capacity for this added flow.

As with Option 1, GIS and Google Earth indicate a low point and drop inlets between Middleridge Lane and Williamsburg Lane. Invert elevation information for the apparent storm drain was not available and the design assumes no conflict with the storm drain. Location and elevation data for drainage facilities and utilities, as well as detailed surface topographic survey and must be provided to further assess the feasibility of this option. Also, the addition of sewer flows to the Lariat Lane Pump Station would require discussion with LACDPW and the City of Rolling Hills Estates regarding coordination, permitting, and possible pump station upgrade improvement design.
329
15 OPTION 3 (SEE APPENDIX K)
FIGURE NO. 5
(see Figure No. 5 above) This alternative would convey flow from the study area southeast along PVDN to the intersection of Rolling Hills Road. The topography in the area reveals that the intersection of Rolling Hills Road is approximately 60 feet higher than the Middleridge Lane/PVDN area. The sewer flow from Middleridge Lane and Williamsburg Lane could convey to a common manhole and then be pumped to Rolling Hills Road to the project currently under design. As with Option 2, two scenarios were modeled under Option 3, Study Options 3A and 3B. Option 3A modeled the following areas and respective zoning as tributary to the system:

Area 13 (green) – RAS-1 = min. lot size 1 ac = 19.3 ac
Area 18 (orange) – RAS-1 = min. lot size 1 ac = 28.5 ac 330
16 Option 3A assumes the flows upstream of Middleridge Lane and Williamsburg Lane are conveyed to Portuguese Bend Road and are not tributary to the sewer system in PVDN. Under this scenario, the downstream system has capacity for this conveyance as it was established in the Phase II Study.

Option 3B modeled the following areas and respective zoning as tributary to the system:

Area 9 – RAS-2 = 67.6 ac
Area 13 (yellow) – RAS-2 = min. lot size 2 ac = 176.8 ac Area 13 (green) – RAS-1 = min. lot size 1 ac = 19.3 ac
Area 18 (portion, pink) - RAS-2 = min. lot size 2 ac = 94 ac Area 18 (Orange) – RAS-1 = min. lot size 1 ac = 28.5 ac Option 3B assumes the flows upstream of Middleridge Lane and Williamsburg Lane are conveyed to this sewer system. Under this scenario, the downstream system has capacity for this conveyance the downstream system has capacity for this conveyance as it was established in the Phase II Study.

As with Option 1, GIS and Google Earth indicate a low point and drop inlets between Middleridge Lane and Williamsburg Lane. Invert elevation information for the apparent storm drain was not available and the design assumes no conflict with the storm drain. Location and elevation data for drainage facilities and utilities, as well as detailed surface topographic survey and must be provided to further assess the feasibility of this option. 331
17 OTHER OPTIONS
Although not studied in detail, other possible conveyance options are available. These would entail multiple sewer lines be constructed and conveyed to more than one of the outlets. That is, the flow could be conveyed to Crenshaw Boulevard, Dobbin Lane, and Rolling Hills Road, or any combination of those 3 connection points. To be conservative, the subject study analyzed all of the flow conveyed to one outlet.

CONCLUSIONS
The analyses provided reveal that all conveyance options studied are feasible, yet warrant more detailed design information regarding the following:

Right of Way verification
Topographic survey
Storm drain location and invert elevation
Utility locations and sizes
Lariat Lane Pump Station design information
Additionally, the conveyance options may require coordination and submittal of documents to:

Sanitation District of Los Angeles County (San District) to obtain a “Will Serve Letter”; Submittal of a Sewer Area Study to the San District, LACDPW and the City of Rolling Hills Estates;
Obtaining sewer flow measurements to correlate field conditions with the sewer modeling. 332

APPENDIX A
Project Location Map
333
Middleridge Lane Williamsburg Lane City Hall Palos Verdes Drive North Rolling Hills Road
Crenshaw Boulevard
Dobbin Lane

PROJECT LOCATION MAP

PROJECT
AREA 334

APPENDIX B
Project Area Map and Conveyance Options Map
335
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2 18
19 7
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1 10
12 4
13 3
14 6
16 20
15 290
340
360
310
350
320
260
330
270
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190
180
370
210
150
280
160
250
380
220
170
230
240
200
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370
280
380
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DR
RD
LN
RD
RD
CYN
RD
BLVD
CHES
PALOS
JOHNS

SILVER SPUR RD

CRENSHAW

CREST RD

BURMA RD

HILLSIDE

OUTRIDER

BRONCO DR

GANADO DR

BUGGY WHIP

SADDLEBACK

CABALLEROS

CREST RD E

CREST RD W

WESTVALE
RD

EASTVALE
RD

VERDES DR E

QUAIL RIDGE

GEORGEFF
RD

FORRESTAL DR

BUCKBOARD
LN

EASTFIELD DR

EASTFIELD DR

SUNNYRIDGE RD
CRE
N
S
HAW
BLVD

STRAWBERRY
LN

CRENSHAW BLVD

EUCALYPTUS LN
CH
U
C
KWAG
ON
RD

SOUTHFIELD
DR

BUGGY WHIP
DR

PORTUGUESE BEND

ROLLING
HILLS
RD

PALOS VERDES DR N

BLACKWATER
CYN
RD
®
City of Rolling Hills
Sanitary Sewer Feasibility Study
Gravity Sewer System with Tributary Areas
Appendix D - Exhibit A - Gravity Sewer Conceptual Design (NOT TO SCALE)
Legend
!. Sewer Manholes
$1 Grinder Pumps
Ú[ Lift Stations
Sewer Pipes
Sewer Laterals
Force Mains
Force Laterals
LA County Sewer Pipes
LA County Sewer Manholes
City Boundary
Area Boundary
!.

Middleridge
Lane Williamsburg
Lane
Document referenced
from 2008 Study
336
Williamsburg Lane Middleridge Lane Palos Verdes Drive North Dobbin Lane
Option 1 Option 2
Option 3
337

APPENDIX C
Conveyance of Upstream Parcels to Rolling Hills Road
338
(507) FS
(540) FS
(526) FS
(534) FS
(527) FS
(535) FS
(514) FS S=0.0040
S=0.0040
S=0.0040
(511) FS
(540) FS

PALOS VERDES DRIVE NORTH
(550) FS/HP
S=0.0200 PT1 PT2 PT3 PT5 PT4 PT6 PT7 PT8 PT10 PT11 PT12 (528) FS PT9 PT13 349.00' 237.43' LC=157 .07 ' 65.07' LC=2 41.9 0' LC=177 .8 4' LC=61.6 2 ' 119.52' LC=2 4 0 .4 5 ' LC=2 3 3 .3 5 ' (509) FS 316.17' (513) FS (545) FS (524) FS PT9.5 257.94' (538) FS LC=5 6 .01' S=0.0401 CITY OF ROLLING HILLS CITY OF ROLLING HILLS OF Know what'sbelow. Callbefore you dig. ® 1 3 LEGEND: (513) FS = Surface Elevation per Google Earth 502.79 INV. = Design sewer invert elevation at slope of 0.004 ft/ft EL (509.71) = Surface Elevation per GIS = Point Number for Manhole PT5 339

APPENDIX D
As-Built Information
340

PROJECT AREA
341

PROJECT AREA
342

PROJECT AREA
343

PROJECT AREA
344
6'-8 3/4" 5'-3/4"
143'-6 3/4"
13'-9 1/2" 8'-7 1/2" 13'-3 1/2"
345
8'-10 3/4"
146'-11 3/4"
440 Google
earth
346
347
348
6'-4" 11'-8"
349
11'-1 1/4" 15'-4 1/2"
350
351
8'-4 3/4" 10'-1 1/2" 7'-10" 7'-10 1/2"
352
353
354
355
356
357
PORTUGUESE BEND/ROLLING HILLS ROAD SEWER MAIN IMPROVEMENT PROJECT Know what'sbelow. Calltwo working before you dig.

R PUBLIC WORKS DEPARTMENT CITY OF ROLLING HILLS No. C50129 LUA N

NE BEA N

C I V I L

REGISTERED PROFES

SIONA L ENGINEER

S T A T E
O F
C
A

L I F O R N I A
358
Know what'sbelow.

Calltwo working before you dig.

R

PUBLIC WORKS DEPARTMENT

CITY OF ROLLING HILLS
No. C50129

LUA NNE BEA N

C I V I L

REGISTERED PROFESSIONA L ENGINEER

S T A T E O F C A L I F O R N I A
359
1 inch = ft.

GRAPHIC SCALE
20 Know what'sbelow.

Calltwo working before you dig. R

PUBLIC WORKS DEPARTMENT

CITY OF ROLLING HILLS
No. C50129 LUA NNE BEA N C I V I L REGISTERED PROFESSIONA L ENGINEER S T A T E O F C A L I F O R N I A

CRENSHAW BLVD
360
1 inch = ft.

GRAPHIC SCALE
20 Know what'sbelow.

Calltwo working before you dig. R

PUBLIC WORKS DEPARTMENT

CITY OF ROLLING HILLS
No. C50129 LUA NNE BEA N C I V I L REGISTERED PROFESSIONA L ENGINEER S T A T E O F C A L I F O R N I A 361
1 inch = ft.

GRAPHIC SCALE
20 Know what'sbelow.

Calltwo working before you dig. R

PUBLIC WORKS DEPARTMENT

CITY OF ROLLING HILLS
No. C50129 LUA NNE BEA N C I V I L REGISTERED PROFESSIONA L ENGINEER S T A T E O F C A L I F O R N I A 362
1 inch = ft.

GRAPHIC SCALE
20 Know what'sbelow.

Calltwo working before you dig. R

PUBLIC WORKS DEPARTMENT

CITY OF ROLLING HILLS
No. C50129 LUA NNE BEA N C I V I L REGISTERED PROFESSIONA L ENGINEER S T A T E O F C A L I F O R N I A

PALOS VERDES DR
363
1 inch = ft.

GRAPHIC SCALE
20 Know what'sbelow.

Calltwo working before you dig. R

PUBLIC WORKS DEPARTMENT

CITY OF ROLLING HILLS
No. C50129 LUA NNE BEA N C I V I L REGISTERED PROFESSIONA L ENGINEER S T A T E O F C A L I F O R N I A 364
Know what'sbelow.

Calltwo working before you dig.

R

PUBLIC WORKS DEPARTMENT

CITY OF ROLLING HILLS
No. C50129

LUA NNE BEA N

C I V I L

REGISTERED PROFESSIONA L ENGINEER

S T A T E O F C A L I F O R N I A
STA. 10+00 SEWER MANHOLE DETAIL STA. 10+34.94 SEWER MANHOLE DETAIL STA. 12+43.44 SEWER MANHOLE DETAIL STA. 12+93.11 SEWER MANHOLE TO BE REMOVED STA. 15+93.95 SEWER MANHOLE DETAIL STA. 40+00 SEWER MANHOLE DETAIL STA. 43+50 SEWER MANHOLE DETAIL STA. 47+78.69 SEWER MANHOLE DETAIL STA. 52+28.69 SEWER MANHOLE DETAIL STA. 56+70± SEWER MANHOLE DETAIL 365
SHEET NOTES:

MANHOLE PENETRATION CONNECTION
Know what'sbelow.

Calltwo working before you dig.

R

PUBLIC WORKS DEPARTMENT

CITY OF ROLLING HILLS
No. C50129

LUA NNE BEA N

C I V I L

REGISTERED PROFESSIONA L ENGINEER

S T A T E O F C A L I F O R N I A
366

APPENDIX E
Zoning Information
367
368

CREST RD

HAWTHORNE BLVD
*****

SILVER SPUR
RD

HIGHRIDGE RD

COUNTRY LN

CRENSHAW BLVD

INDIAN PEAK RD

ROLL NI G HILLS RD
PALOS
VERDES
DR

DEEP VALLEY DR

RANCHVIEW RD

CLUB VIEW LN

KINGSPINE RD

BUC KSKI N LN

SILVER SADDLE LN

PONY LN

STEIN HALE NATURE TR
ASPEN
WY

ROCKBLUFF DR

ENCANTO
DR

WILLOW WOOD RD

PENNSYLVANIA DR

SADDLE RD

DEERHILL DR

CYPRESS WY

ELMDALE DR

DAPPLEGRAY LN

SUGARHILL DR

INDIAN VALLEY RD
D

MOCCASIN LN

UNWOOD RD

GAUCHO DR

ROLLINGWOOD DR

BLUEMOUND RD

MISTY ACRES RD

MONTECILLO DR

CONESTOGA DR

AURORA DR

SANTA BELLA RD

SORREL LN

MARINA DR

REAL DR

MARLOMA DR

STONECREST RD

SHADY VISTA RD

COUNTRY MEADOW RD

STRAWBERRY LN
SANTA
CRUZ

HIDDEN VALLEY RD

CARRIAGE DR

GR ANADA

PALOS VERDES LN

SYCAMORE LN

ANACAPA

LARIAT LN

HILLCREST MNR

ESTRIBO DR

EMPTY SADDLE RD

BRIDLEWOOD
CIR

LATIGO LN

MASONGATE DR

OAKTREE LN

SEVILLA

PINTO LN

DORADO PL

CRESTRIDGE RD

ROANWOOD DR

CLEAR VISTA DR

COTTONWOO D CIR

QUAILWOOD DR

SEAVIEW
DR

CROSSFIELD DR

SADDLEBOW LN

DOBBIN LN

SEAHURST RD

HITCHING POST DR

PALOMINO LN

WILDHORSE LN

FOXPOINT LN

SANTA ROSA

CHADWICK LN

BEECHGATE DR

CELESTE PL

SCOTWOOD DR

HORSESHOE LN

SILVER ARROW DR

AVOCADO LN

PONDEROSA LN

ROLLANDO DR

ROLLING MEADOWS
RD

TANGLEWOOD LN

FERNCREEK DR

WHITLEY COLLINS DR

S HADO W LN

SAN MIGUEL

EMPTY SADDLE LN

PEACOCK LN

SPRUCE WY

SWEETGRASS LN

SILVERBIT LN

SILVER EAGLE
RD

HI D DEN LN

EASTVALE RD

CRESTA VERDES DR

BROKENBOW LN

GOLDEN SPAR PL

HARBOR SIGHT DR

SUNNYFIELD
DR

RAWHIDE LN

DRYBANK DR

COLINA LN

PLEASANT HILL D
L
R

AZY C REEK LN

PEAR T REE LN

BRANDING IRON LN

SINGLETREE LN

STABLE WY

BLACKHORSE RD

SILVERLEAF DR

CE RRITO PL

LANTA N A PL

TERRACE DR

MAJORCA

HILLCRES T MEADOW

COVERED WAG ON LN

RANGE HORSE LN

ROXCOVE
DR

SILVER SPRING DR

QUAR TERHORSE LN

SUNDOWN
DR

SPINNING WHEEL LN

ACADEMY DR

POTRILLO RD

LA CROIX DR

RUSTLER LN

BASSWOOD AV

CHALMETTE LN
*****
*****

ROLLANDO DR
*****

EMPTY SADDLE LN

ANACAPA
*****

FERNCREEK DR
*****
*****
*****
*****
*****
*****

LARIAT LN
*** **
*****

HAWTHORNE BLVD
*****
*****
*****
*****
*****
*****

CRENSHAW BLVD
*****
*****
*****
*****
*****
*****
*****
*****

SEAVIEW DR
Legend
City Boundary
Zoning
Residental Low Density (1 Acre)
Residental Low Density (20,000 Sq. Ft.)
Residental Medium Density (15,000 Sq. Ft.)
Residental Medium Density (10,000 Sq. Ft.)
Residental Planned Development
Commercial General
Commercial Office
Commercial Limited
Commercial Recreation
Agricultural
Institutional
Quarry
Open Space Recreation
1 inch = 700 feet
City of Rolling Hills Estates
Zoning Map
369
https://rpgis.isd.lacounty.gov/Html5Viewer/index.html?viewer=GISNET_Public.GIS-NET_Public ZONING MAP FOR UNINCORPORATED LA COUNTY AREA 370

APPENDIX F
LACDPW Sewer Capacity Policy
371
,CL, '",' :'.,,' ": " ,l", ' .. ~,:~(;.( '';~~(,;,
October 12, 2005 ~~ o~jj
Approved
--
'TO:

FROM:

Dean Efstathi0l;\ V
Dennis Hunte( ~
Land Development Division

POLICIES FOR MANAGING AVAILABLE SEWER CAPACITY

AND SEWAGE DISCHARGE IN EXCESS OF DESIGN CAPACITY
The following will set forth Public Works' policies related to managing sewer infrastructure capacity. Design capacity of the sewer mainline is defined as follows:
c: 15" diameter
;: 15" diameter
~ full = 100% capacity (dID)
% full = 100% capacity (dID)
When Public Works determines there is available capacity in a mainline sewer for infil and redevelopment projects, the remaining available capacity shall be allocated on a first come - first serve basis.

Sewer Advisory Committee
A Sewer Advisory Committee (SAC) will be formed for the purpose of recommending courses of action to address proposed development connecting to existing sewers that will cause them to be operating beyond their design capacity. The SAC will make their recommendations to Dean Efstathiou, Assistant Director. The SAC will be chaired by Waterworks and Sewer Maintenance Division and will have representatives from Design and Land Development Divisions. Each Division will appoint a Principal Engineer or Senior Civil Engineer as a representative to the SAC and will convene whenever sewer decisions are required to address developmental impacts. Sewer Maintenance will maintain records of SAC meetings and will prepare recommendations to Administration for approval. The SAC may require other Division representatives to participate on a case-by-case basis when necessary, such as Building and Safety and Programs Development.

Divisional Responsibilties
Desiqn Division

1. Support activities of the SAC.

2. Prepare sewer area studies when required.
372
Dea n Efstath iou
August 25, 2005

3. Maintain records/archive of all approved sewer area studies and flow measurements.

Land Development Division

1. Support activities of the SAC.

2. Impose sewer area study requirements for private developments if necessary and reviewlapprove all submittals.

3. Refer cases to SAC when both sewer area studies and flow measurements indicate that a potential overload situation exists or will exist based on criteria described below.

4. Provide copies of all approved sewer area studies and flow measurements to Design Division for archiving.

Waterworks and Sewer Maintenance Division
1 . Chair the SAC, maintain meeting records and prepare position papers to Administration.

2. Advise the SAC when an overload condition is observed during maintenance activities.

3. Initiate effort to track and map all overload areas within the Consolidated Maintenance District.

4. Keep database of all flow measurement results.

Desiqn Criteria

1. Capacity of sewer mainlines less than 15" in diameter are considered full (100 percent) when the ratio of the depth of flow (d) over the pipe diameter (D) is equal to 0.5, expressed as dID = 0.5.

2. Capacity of sewer mainlines equal to or greater than 15" in diameter are considered full (100 percent) when the ratio of the depth of flow (d) over the pipe diameter (D) is equal to 0.75, expressed as dID = 0.75. 373
Dean Efstathiou
August 25, 2005

3. When an area study indicates that flow conditions based on calculated discharges is between 101 percent to 150 percent of capacity, no flow measurements and no mitigation will be required. If maintenance records warrant, a flow test may be required.

4. When an area study for a development that proposes to increase the density or change the zoning indicates that flow conditions are between 151 to 200 percent of capacity, flow measurements shall be required. If the flow test indicates that the actual flow condition is below 151 percent, no mitigation wil be required. If the flow test results indicate the actual flow is above 151 percent, the case shall be referred to the SAC to evaluate options and make recommendations to Administration for approval. These options may include, but are not limited to: requiring full mitigation from the development, assessing pro-rata shares, creation of a reimbursement district, or establishing a County Improvement (CI) district.

AHN:ca
P:\LDPUB\SUBPCHECK\SEWER\MISCELLANEOUS\SEWER IN FRASTRUCTURE MANAGEMENT cc: Administration (Kelly)
BUil?ing and Safety (Patel) D,). Design (Kumar) (Itl. ¡Art ¿~ Land Development (D'Antonio, Burge~hong, Witler, Narag) Programs Development (Afshari) ,
Waterworks and Sewer Maintenance (Del Real, Lehto)
374

APPENDIX G
LACDPW Flow Generation Coefficients
375
Occupancy Abbreviation *Average daily flow
Apartment Buildings:

Bachelor or Single dwelling units Apt 150 gal/D.U.
1 bedroom dwelling units Apt 200 gal/D.U.
2 bedroom dwelling units Apt 250 gal/D.U.
3 bedroom or more dwelling units Apt 300 gal/D.U.

Auditoriums, churches, etc. Aud 5 gal/seat
Automobile parking P 25 gal/1000 sq ft gross floor area Bars, cocktails lounges, etc. Bar 20 gal/seat
Commercial Shops & Stores CS 100 gal/1000 sq ft gross floor area Hospitals (surgical) HS 500 gal/bed
Hospitals (convalescent) HC 85 gal/bed
Hotels H 150 gal/room
Medical Buildings MB 300 gal/1000 sq ft gross floor area Motels MB 150 gal/unit
Office Buildings Off 200 gal/1000 sq ft gross floor area Restaurants, cafeterias, etc. R 50 gal/seat
Schools:

Elementary or Jr. High S 10 gal/student
High Schools HS 15 gal/student
Universities or Colleges U 20 gal/student
College Dormitories CD 85 gal/student
Zone Coefficient (cfs/Acre)
Agriculture ---------------------------------- 0.001
Residential*:

R-1 -------------------------------------------- 0.004
R-2 -------------------------------------------- 0.008
R-3 -------------------------------------------- 0.012
R-4 -------------------------------------------- 0.016* Commercial:

C-1 through C-4 ---------------------------- 0.015*
Heavy Industrial:

M-1 through M-4 -------------------------- 0.021*
exceed the coefficients shown
* Use 0.001 (cfs/unit) for condominiums only
Estimated Average Daily Sewage Flows for Various Occupancies *Multiply the average daily flow by 2.5 to obtain the peak flow Zoning Coefficients
* Individual building, commercial or industrial plant capacities shall be the determining factor when they Source: Los Angeles County Department of Public Works
For large lots, per LACDPW, use a coefficient prorated on 0.001 cfs/ac as follows:
1 ac lot: Coeff. = 0.001 cfs/ac x (43,560 / 43,560) = 0.001 cfs/ac 2 ac lot: Coeff. = 0.001 cfs/ac x (43,560 / 87,120) = 0.0005 cfs/ac 20,000 sf lot: Coeff. = 0.001 cfs/ac x (43,560 / 20,000) = 0.0022 cfs/ac 376

APPENDIX H
Google Earth Image
377
Drop inlets Possible Culvert
Location
378

APPENDIX I
Option 1 Exhibits
379
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®
City of Rolling Hills
Sanitary Sewer Feasibility Study
(NOT TO SCALE)
TIE-IN
No 1
TIE-IN
No 2
TIE-IN
No 3
TIE-IN
No 4
TIE-IN
No 5
TIE-IN
No 6
City Boundary
Legend
Boundary No 5
Boundary No 1
Boundary No 6
Boundary No 2 & 3
Boundary No 4
(483) (155) (153) (152) (154) (156) (157) (151)
Area 13
GREEN

19.3 AC
(483) EXISTING MANHOLE NUMBER
MH 10 PROPOSED MANHOLE NUMBER
PROPOSED 8" GRAVITY VCP

MH 10 MH 11 MH 21 MH 22
STUDY EXHIBIT 1
Convey Northwest to Crenshaw Boulevard
PROPOSED 8" VCP
(14)

JOIN EXISTING
426.3 INV
(502) (503)

LARIAT PUMP

STATION
(501) (500) (499) (493)
Area 18
ORANGE

28.5 AC
MH 23
Area 13
Yellow
176.8 AC Middle Ridge Ln
Williamsburg Ln
Area 18
Pink
94 AC
Area 9
Blue

67.6 AC Dobbin Ln
MH 24 MH 25 MH 26 Rawhide Ln
Branding Iron Ln
Crenshaw Blvd.

6.2AC5.7AC 2.8 AC

55.6 AC
See Enlarged
Image at Left
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150
120
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T
(483) (155) (153) (152) (154) (156) (157) (151)
Area 13
GREEN
MH 10 MH 11 MH 21 MH 22
8" VCP
(502) (50 (501) (500) (499) (493) MH 23
e Ridge Ln
Ln
Dobbin Ln
MH 24 MH 25 MH 26 Rawhide Ln
Branding Iron Ln
Crenshaw Blvd.

6.2AC5.7AC 2.8 AC

55.6 AC
Upper portion of Area 18
assumed to convey into
Area 17.
380
CITY OF ROLLING HILLS CITY OF ROLLING HILLS OF Know what'sbelow. Callbefore you dig. ® 3 1" = 100' CONVEY NORTHWEST TO CRENSHAW BOULEVARD EXHIBIT 1 1 DOBBIN LN

SUNNY FIELD

WILLIAMSBURG LN MIDDLE RIDGE NORTH

RAWHIDE BRANDING IRON LN

EAST VALE ROAD PALOS VERDES DRIVE NORTH PALOS VERDES DRIVE NORTH 381

APPENDIX J
Option 2 Exhibits
382
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0 5
8 17
2 18
19 7
9 11
1 10
12 4
13 3
14 6
16 20
15 300
310
340
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360
370
290
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190
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210
280
150
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250
380
170
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390
130
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120
410
110
100
90 80 70
420
430
440
60 160
240
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200
120
180
410
280
330
240
160
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160
180
70 260
190
150
370
120
100
290
180
430
400
270
170
140
310
240
330
200
170
390
270
380
270
390
300
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190
390
140
370
300
440
90 140
400
140
290
130
130
220
280
100
110
210
350
110
210
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130
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360
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190
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110
®
City of Rolling Hills
Sanitary Sewer Feasibility Study
(NOT TO SCALE)
TIE-IN
No 1
TIE-IN
No 2
TIE-IN
No 3
TIE-IN
No 4
TIE-IN
No 5
TIE-IN
No 6
City Boundary
Legend
Boundary No 5
Boundary No 1
Boundary No 6
Boundary No 2 & 3
Boundary No 4
(483) (155) (153) (152) (154) (156) (157) (151)
Area 13
GREEN