Ownership of Facilities and Equipment at the
Thomas Shaft, Hetch Hetchy Coast Range Tunnel
Historical Background and General Description
The U.S. Department of Energy (Government) and the San Francisco Public Utilities Commission (SFPUC) have installed facilities and equipment on SFPUC fee owned property at the Thomas Shaft of the Coast Range Tunnel (shown generally in Diagram C on page 6 of this Attachment 8). In 1995, the Government purchased and constructed the first pumping equipment and piping components at the Thomas Shaft for the sole purpose of transporting Hetch Hetchy water from the SFPUC’s Regional Water System to Lawrence Livermore National Laboratory’s (LLNL) Site 300. Due to the State of California water quality regulatory changes that became effective after 1987, the Thomas Shaft pumping system was not able to deliver potable water to Site 300 without treatment. In 2002, the Government and the SFPUC mutually agreed through Modification 5 to Contract DE-AC03-76SF16828 that the SFPUC would install, at its own cost, the Thomas Shaft Chlorination Facility approximately 120 feet northeast of the Thomas Shaft. The Thomas Shaft Chlorination Facility was designed and constructed to reuse or replace the original 1995 Thomas Shaft equipment. The Thomas Shaft portion of the system was necessary to pump water from the Coastal Range Tunnel (approximately 354’ below grade up to the Thomas Shaft Chlorination Facility). Once the water was treated at the Thomas Shaft Chlorination Facility, it would be piped back toward the Thomas Shaft into a 10-inch pipe that runs below grade on the Thomas Shaft access road, also owned in fee by the SFPUC, about 1.54 miles to Site 300 (see Attachment 7 for SFPUC Property Drawing). The SFPUC maintains and operates the pumping, treatment, and delivery processes associated with these facilities and equipment. The SFPUC only supplies water to Site 300 when the Hetch Hetchy supply is available and when the Site 300 water distribution system signals to the SFPUC that it requires more water (e.g., the Government signals via telemetry between Site 300 and the Thomas Shaft when Site 300 tank water levels are low and require additional supply).
In 2015, through Contract DE-NA0002471, the Government transferred the ownership of certain Thomas Shaft components that were originally designated as Government property to the SFPUC. As of January 1, 2015, the SFPUC has sole ownership of and responsibility to operate and maintain those components, identified in Section A below, which are upstream of the Point of Delivery at the Thomas Shaft facilities shown on SFPUC Drawing E-15731 in Attachment 7. The SFPUC also owns the enclosures and equipment that the SFPUC installed in 2010 that are identified in Section B below.
The Thomas Shaft components that remained Government property following the 2015 transfer, and additional components installed by the Government since 2015 that remain Government property, are identified in Section C below. These components include: (1) the 10-inch diameter piping downstream of the Point of Delivery to Site 300, (2) a 10-inch backflow preventer installed in 2020, (3) new radio system and temporary communications antenna installed in 2022, and (4) the G1 and G4 control panels. It is the Government’s responsibility to operate and maintain these components. The Government and its representatives shall also coordinate with, and obtain prior approval from, SFPUC staff for access to Government-owned equipment and components located within the Thomas Shaft facilities.
A. Original 1995 Government Property Transferred to the SFPUC in 2015:
Attachment 7
1. 266 lineal feet of 8’ (H) wire cloth security fencing surrounding Thomas Shaft Deep Well Pump area enclosing Electrical Utility Prefabricated Enclosure, Well Pump Prefabricated Enclosure, and Deep Well Pumps at top of shaft casing.
2. Electrical Utility Prefabricated Enclosure: 10’ (W) x 16’ (L) x 10’ (H) prefabricated enclosure Atkinson Industries Inc. Model 128-004, Shop Order C5639, Manufactured October 1993. The following is contained within the Electrical Utility Building:
a. Motor Control Center No. 571A
i. Space A1: Automatic Transfer Switch 571A, Westinghouse Series 2100 208V/120V ii. Space B1: Circuit Breaker Welding Receptacle
iii. Space B2: Joslyn Surge Pack, Surge Protection Equipment iv. Space B3: Relay Deep Well Pump No. 1
v. Space B4: Relays Deep Well Pump No. 1 and No. 2
vi. Space C1: Spare Switch
vii. Space C5: Capacitor Deep Well Pump No. 2
viii. Space D1: Circuit Breaker Deep Well Pump No. 2
ix. Space D5: Capacitor Deep Well Pump No. 1
x. Space E1: Circuit Breaker Well Pump WP-1
xi. Space E5: Circuit Breaker Well Pump WP-2
xii. Space F1L: Primary Disconnect Switch Transformer T572 xiii. Space F1R: Main Circuit Breaker Lighting and Electrical Panel 572A b. Electric Transformer T572, MGM Transformer Co., CAT No. HT20A3B2, S/N 94-1-85622-1, 30 KVA 480V-208V/120V 3-Phase
c. Exterior and Interior Lighting Fixtures
d. Wall Mounted Phone Instrument
e. Wall Mounted HVAC Heat Pump ACHPS-01 and Thermostat
3. Electrical Meter Cabinet No. 511 [outside of security fencing area, adjacent on north side of fenced area][meters themselves are Pacific Gas & Electric Co. property]
4. Electric Transformer No. T571 500 KVA 12KV/480V [Outside of security fencing area, adjacent on north side of Electrical Meter Cabinet No. 511]
5. Isolation Valve No. 101 [between 10” Diameter x 8” Diameter 90 Degree Elbow and 8” Diameter x 6” Diameter 90 Degree Elbow on SFPUC’s 6” Diameter UV Reactor Treated Water Piping] [was installed new in 2010 by the SFPUC using its funds; replaced old valve]
6. 6” Reduced Pressure Backflow Preventer [was installed new by the SFPUC using its funds; replaced old Backflow Preventer]
7. 6” Piping Connecting Well Nos. 1, 2 & 3 to SFPUC Thomas Shaft Chlorination Facility and Appurtenances [Y-Strainer, Butterfly Valves, Gate Valve, Angle Ball Plugs (for disinfection), 6” Surge Control Valve, Flowmeter, Air Valve] [most of this was demolished and replaced in 2010 with new by the SFPUC using its funds – see SFPUC drawing E-15731 in Attachment 7.
8. 12” Diameter Well Casings (3) Nos. 1, 2, & 3 [original, i.e., prior to 2010 SFPUC construction work]
9. 4” Diameter Well Piping for Deep Well Nos. 1 & 3 located within well casings [Nos. 1 and 3 are original, i.e., prior to 2010 SFPUC construction work, and were not removed or replaced by the SFPUC in 2010]
B. Enclosures and Equipment Installed by the SFPUC in 2010 as SFPUC Property:
Attachment 7
1. Well Pump Prefabricated Valve Enclosure: 18’ (W) x 20’ (L) x 10’ (H) building structural Steel w/ concrete foundation to enclose the Point of Delivery and various mechanical components. [installed by the SFPUC in 2010 using its funds]
a. Surge Tank T-1 SSA-2000E/200 S/N 179574 and Associated Appurtenances and 4” Diameter Surge Piping [located within the Well Pump Prefabricated Valve Enclosure] [installed new by the SFPUC in 2010 using its funds; no surge tank was used as part of the Government’s 1995 constructed system]
2. Deep Well Pumps Nos. 2 & 3 at Well Casings Nos. 2, & 3 respectively [two (2 each) 100 horsepower submersible multistage lift pumps owned by the Government were removed by the SFPUC in 2010 and replaced with new pumps using its funds; the removed pumps were delivered to LLNL in 2010 for reuse elsewhere]
3. 4” Diameter Well Piping for Deep Well No. 2 located within well casing No. 2 [the original No. 2 4” Diameter Well Piping for Deep Well No. 2 was replaced by the SFPUC in 2010 using its funds; the removed components were delivered to LLNL in 2010 for reuse elsewhere]
C. Equipment that Remains Government Property:
1. Within the Electrical Utility Prefabricated Enclosure at Motor Control Center No. 571A:
a. Space G1: Pump Controls OPTO 22 Controller
b. Space G4: LLNL Telecommunication LLIX System
c. Space G4: New radio system connected to the temporary communications antenna (installed by the Government in 2022).
2. Temporary communications antenna (Mount Yagi, 902-960 MHz), mounting pole, and associated conduit leading into Electrical Utility Prefabricated Enclosure that terminates at the radio denoted in
1.c (installed by the Government in 2022) [see Diagram A below].
3. 10-inch diameter backflow preventer (installed by the Government in 2020), including valve V-101 and all pipes, valves, and associated appurtenances downstream of V-101 to Site 300 Valve Box No. 1 [see Diagrams B and D below].
Attachment 7
Diagram A. Temporary Antenna and Radio Installation at Electrical Utility Enclosure
Attachment 7
Diagram B. Backflow Device Downstream of Valve V-101
Attachment 7
Diagram C. General Illustration of Facilities and Equipment at Thomas Shaft
Point of
Delivery
10” pipeline
owned by
Government
Utility Enclosure
Electric
Transformer
T572
Phone
AC Unit
G1 and G4 (Govt Owned)
Not Present-
Delete
Well Pump Valve
Enclosure
North of V101
Surge Tank
Wells
1, 2,
and 3
Attachment 7
Diagram D. Aerial Map of the SFPUC Thomas Shaft Area