appendix l

128 Pages·2013·12.24 MB·English

APPENDIX L
Sewer Study

Ka ise r Pe rm a n e n te
Sa n Die go Ce n tra l Ho spita l
Me dica l Ce n te r

Sewer Study
Prep a red b y:

RBF C onsulting

9 7 5 5 C la irem ont M esa Blvd .

Sa n D ieg o, C A 9 2 1 2 4

8 5 8 .6 1 4 .5 0 0 0

C onta ct: Trud i Lim RC E 6 1 2 1 3

January 2013

R B F Jo b N um b er 25105 4 30.001

Preliminary Sewer System Study
Kaiser Permanente San Diego Centra lHospital
Table of Contents
Section 1 - Introduction ........................................................................................................................... 1
Section 2 - Project Description ................................................................................................................. 1
2.1 Project Location: ........................................................................................................................ 1
2.2 Proposed Project:....................................................................................................................... 2
2.3 Prior Site Planning ...................................................................................................................... 3
2.4 Study Area ................................................................................................................................. 3
2.5 Sewage Generation Rates: ......................................................................................................... 6
Section 3 - Sanitary Sewer Analysis .......................................................................................................... 8
3.1 Guidelines, Data, Exhibits and Previous Study Reports ............................................................... 8
3.2 Sanitary Drainage Area Equivalent Population Analysis .............................................................. 8
3.3 Model Methodology ................................................................................................................ 11
3.4 Hydraulic Analysis Results – Phase 1 & Phase 2 ........................................................................ 12
Section 4 - Recommendations ............................................................................................................... 14
Section 5 - Appendices .......................................................................................................................... 15

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Preliminary Sewer System Study
Kaiser Permanente San Diego Centra lHospital
Figure Index
Figure 2-1 Project Site (Reference Thomas Bros. Map 1249 E1) ............................................................... 1
Figure 2-2 Proposed Site Layout .............................................................................................................. 2
Figure 2-3 Sanitary System Map and Study Area ...................................................................................... 4
Figure 2-4 Sanitary Sewer Exhibit............................................................................................................. 5
Figure 3-1 Sanitary Sewer Study Summary (Hydraulic Model Results) .................................................... 13
Table Index
Table 2-1 Proposed Project Summary ...................................................................................................... 2
Table 2-2 Sewer Generation Rates: City of San Diego Sewer Design Guide 2004 ...................................... 6
Table 2-3 Sewer Generation Rates: Wastewater Engineering - Treatment &
Reuse 4th Ed. (Metcalf & Eddy) ................................................................................................ 7
Table 3-1 Equivalent Population Summary Method 1 .............................................................................. 9
Table 3-2 Equivalent Population Summary Method 2 ............................................................................ 10
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Preliminary Sewer System Study
Kaiser Permanente San Diego Centra lHospital
Section 1 - Introduction
This report provides background data, analysis, and a summary of results as part of a preliminary
sanitary sewer system study for the proposed Kaiser Permanente San Diego Central Hospital project.
The purpose of this study is to ascertain the potential impact of the proposed project on the existing
sanitary sewer system and to verify that sufficient capacity exists within the existing sewer facilities.
Section 2 - Project Description
2.1 Project Location:
The proposed Kaiser Permanente San Diego Central Hospital site is comprised of a 20.01-gross acre
parcel (APN 369-121-14-00) that is currently developed with a single story 337,564 square-foot structure
formerly utilized as the County of San Diego Annex. Excluding dedicated Right-of-Way, the parcel area is
19.38 acres. Located at 5201 Ruffin Road in San Diego, California, the Project site abuts the Polanski
Child Services Center to the east with street frontage along Clairemont Mesa Boulevard to the north,
Ruffin Road to the west, and Ruffin Court to the south. The entire project site was previously graded
and is currently developed. The Project site is shown in Figure 2-1.
Figure 2-1
Project Site (Reference Thomas Bros. Map 1249 E1)
Project Site
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Preliminary Sewer System Study
Kaiser Permanente San Diego Centra lHospital
2.2 Proposed Project:
The proposed project at 5201 Ruffin Road will be a new Central Hospital to provide centralized tertiary
services for the entire county of San Diego. The new Kaiser San Diego Central Hospital (Hospital) will
serve as a partial replacement to the existing Kaiser San Diego Medical Center (SDMC). The new
Hospital will be constructed in two (2) phases; however, this WSA addresses the ultimate development
of both phases which will include 450 beds and 720,000 gross square feet (GSF). The project will also
include an Energy Center of approximately 38,000 GSF, a Hospital Support Building of approximately
180,000 GSF, and a Parking Structure with a total of 2,200 parking stalls. Table 2-1 summarizes the
phasing of the proposed Project. Figure 2-2 depicts the schematic site layout for the Project including
the location of the hospital building, hospital support building, energy center, and parking structure
within the Project area.
Table 2-1
Proposed Project Summary
Phase 1 Phase 2 Total
321 Beds 129 Beds 450 Beds
Hospital Building
550,000 SF 170,000 SF 720,000 SF
Hospital Support Building 180,000 SF -- 180,000 SF
Energy Center 36,000 SF -- 36,000 SF
Parking Structure 1,263 Stalls 937 Stalls 2,200 Stalls
Figure 2-2
Proposed Site Layout
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Preliminary Sewer System Study
Kaiser Permanente San Diego Centra lHospital
2.3 Prior Site Planning
The Kearny Mesa Community Plan currently designates the site as county facilities and is identified as a
county facility having an existing 337,564 square foot structure that would be demolished to
accommodate the proposed Project. As previously noted, the site is zoned IL-2-1 (previously M1-B)
which requires a maximum 0.5 Floor Area Ratio (FAR). Development proposals which exceed 0.50 FAR
would be considered through a discretionary permit process that would address potential traffic and
environmental impacts.
2.4 Study Area
The subject study area, shown in Figure 2-3 on the following page generally encompasses the parcels
fronting Ruffin Road between Spectrum Center Boulevard and Clairemont Mesa Boulevard, and also
fronting Clairemont Mesa Boulevard between Ruffin Road and Overland Avenue. The primary zoning in
the area consists of light industrial (IL-2-1) along Ruffin Road with a mixture of commercial (CC-1-3) and
light industrial (IL-3-1) along Clairemont Mesa Boulevard. In accordance with the requirements specified
in the preliminary permit review submittal comments, the proposed project is required to prepare a
sewer system study with manhole to manhole calculations performed from the upstream sewer system
reach on Ruffin Road downstream to the connection to existing 15-inch sewer in Clairemont Mesa
Boulevard east of Overland Avenue.
The proposed project will connect to the existing 8-inch PVC gravity sewer located south of the site in
the Ruffin Court and to the last reach of existing 10-inch vitrified clay pipe (VCP) gravity sewer located
west of the site in Ruffin Road (see Figure 2-4).
The 8-inch Ruffin Court sewer flows westerly and connects to the 10 inch Ruffin Road sewer via the
manhole located at the intersection of Ruffin Court and Ruffin Road. Additional sanitary flow from the
west (Lightwave Avenue) and south (portion of Spectrum Center Boulevard and Ruffin Road) converge
just south of the Ruffin Court and Ruffin Road intersection. The 10-inch sanitary sewer continues
northerly along the Ruffin Road alignment approximately 1,020 lineal feet to the intersection of
Clairemont Mesa Boulevard and Ruffin Road. At this intersection, a 12-inch VCP sewer flows westerly
within the Clairemont Mesa Boulevard alignment approximately 1,150 lineal feet to the point of
connection to the 15-inch VCP sewer about 148-feet east of the intersection of Clairemont Mesa
Boulevard at Overland Avenue. Refer to Figure 2-3, Figure 2-4, and City of San Diego SEWER FIELD BOOK
Pages H11S, H12S and I12S.
The existing Ruffin Road and Clairemont Mesa Boulevard sewers were constructed during the 1960s are
generally of VCP. The branch connecting sewers along Spectrum Center Boulevard, Lightwave Avenue,
and Ruffin Court were constructed primarily in the late 1990s and early 2000s and are of PVC
construction.
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! KAISER PERMANENTE SAN DIEGO CENTRAL MEDICAL CENTER
0 125 250 500
SANITARY SYSTEM MAP AND STUDY AREA
Feet
Source: Figure 2-3