El Dorado Co.

El Dorado

Co. P

al cer Co.

P al cer Co.

El Dorado Co.El Dorado Co. Sacramento Co.

Sacramento

Co.

Placer Co. Placer Co.

Sacramento Co. Sacramento Co.

400

42

40

5

425

400

400

425

465

465

500

500

500

500

500

500

500

DIKE 1 

DIKE 2 

DIKE 3 

DIKE 4 

DIKE 5 

DIKE 6 

RIGHT WING 

DAM 

DIKE 7 

DIKE 8 

FOLSOM

DAM 

LEFT WING 

DAM 

CORPS

STAGING 

PROPOSED 

AUXILIARY 

SPILLWAY 

MIAD

MIAD

LEFT

MIAD

RIGHT

D2

D1

Granite

Bay

Beals

Point

Folsom

Point



0 3000 

FEET 

1:36,000

NORTH 

Potential Construction Zones 

Potential Borrow Areas 

Potential Contractor Use / Staging Areas 

Potential Borrow Areas and Potential 

Contractor Use/ Staging Areas 

Coffer Dam 

Processing Only 

(Approximate Location) 

Concrete and Processing 

(Approximate Location) 

465ft

500ft

425ft

400ft

Contours

Folsom

Reservoir

Figure 2-2

Alternative 3, Draft EIS/EIR

Construction Zones
Chapter 2 

Project Description 

 

The haul roads and routes for the revised Preferred Alternative are described below. 

a) Auxiliary Spillway to MIAD – This haul route would predominantly follow a 

portion of Folsom Dam Road closed to public use and the reservoir along the 

existing shoreline at an elevation below 480.5 ft. The haul road would continue 

to stock pile locations identified at Dike 7 along the shore line and cross the 

Folsom Point access road to the stockpile areas near MIAD identified as D1/D2 

and near the right groin area of MIAD. The haul route would have haulage 

access points to the contractor staging areas and stockpile locations identified in 

Figure 2-3 of this document. Public safety would be maintained via fencing or 

other similar measures. There would be nearly continuous public access to 

recreation areas throughout the construction period as outlined in Section 2.5 and 

Chapter 4 of this document. Specifically in relation to haul routes, Folsom Point, 

and associated adjacent recreation trails, access would be maintained year-round 

through the use of traffic control measures and/or grade separated vehicular 

and/or pedestrian crossings and/or temporary alternate public access detours. 

Temporary closures could occur when completing construction of the grade 

separation itself or other access measures or to meet unforeseen project 

circumstances. In such cases, temporary closures would be accomplished during 

off-peak days or the off-season to minimize impacts on recreation activities. 

Reclamation’s Central California Area Office will notify local agencies and the 

general public and accept input in advance of any possible extended closure(s) 

that may be necessary due to unforeseen project circumstances. 

b) Right Wing Dam to Dike 4 – This haul route reflects the above general 

description by predominantly following existing service roads along the 

downstream toes of embankments. The haul route would have haulage access 

points to Dikes 4, 5, 6 and RWD as shown in Figure 2-4 of this document. Public 

safety would be maintained via fencing or other similar measures. There would 

be nearly continuous public access to recreation areas throughout the 

construction period as outlined in Section 2.5 and Chapter 4 of this document. 

Specifically in relation to haul routes, Beal’s Point, and associated adjacent 

recreation trails, access would be maintained with minimal disruption through the 

use of traffic control measures and/or grade separated vehicular and/or pedestrian 

crossings and/or temporary alternate public access detours. Temporary closures 

could occur when completing construction of the grade separation itself or other 

access measures or to meet unforeseen project circumstances. In such cases, 

temporary closures would be accomplished during off-peak days or the offseason to minimize impacts on recreation activities. Reclamation’s Central 

California Area Office will notify local agencies and the general public and 

accept input in advance of any possible extended closure(s) that may be 

necessary due to unforeseen project circumstances. 

Folsom DS/FDR Final EIS/EIR – March 2007 2-11 
Chapter 2 

Project Description 

c) MIAD to Hobie Cove – This haul route follows the description presented in b) of 

this section by predominantly following a previously constructed haul road to 

Browns Ravine along the shoreline below 480.5 ft, as shown in Figure 2-3 of this 

document. Public safety would be maintained via fencing or other similar 

measures. Public recreation access would be maintained year-round, with 

minimal disruption at Browns Ravine and various recreation trails. 

Optimized Borrow 

The Draft EIS/EIR discussed the potential for developing borrow sites near each of 

the Folsom facilities to produce earthen materials for raising structures and 

additional shell material. The Partner Agencies have determined that the majority of 

borrow would be produced from the Auxiliary Spillway excavation site, which 

would reduce the need to develop in-reservoir borrow sites and effects to recreational 

opportunities. However, both agencies may determine the need to develop other 

borrow sites for supplemental use (as a contingency); therefore, the potential has 

been retained in the final project description. 

Supplemental borrow site requirements would be limited to in-reservoir areas, 

between elevation 400.0 and 425.9 ft, north of Beal’s Point at an area below Mooney 

Ridge and the cove area below Dike 8. Also, the Partner Agencies have retained the 

areas outside the reservoir near MIAD at the D1/D2 area as both a contractor staging 

area and potential borrow site. Borrow would no longer occur in the immediate 

vicinity of the Granite Bay or Browns Ravine recreation areas. 

Optimization of borrow operations would substantially reduce adverse effects by 

reducing potential in-reservoir traffic, air quality, recreation and noise impacts on 

roadways and to communities adjacent to the reservoir, as was presented in the Draft 

EIS/EIR. Reclamation’s Central California Area Office will notify local agencies 

and the general public and accept input prior to initiating supplemental borrow 

activities at these sites. 

Staging Areas 

In response to public comments on the Draft EIS/EIR, the Partner Agencies have 

reduced the amount of acreage needed for staging purposes by eliminating, 

consolidating, or reducing acreage from that presented in the Draft EIS/EIR. In 

principle, contractor staging areas would emphasize use of areas with no current 

public access, away from residential areas, use of excess materials to create 

platforms above the normal operating reservoir water surface elevation of 466.0 ft 

and be placed so as to maintain existing or equivalent public recreation access and 

use capacity during the peak recreation season. This change, along with other impact 

reduction measures below would reduce vegetation and wildlife and recreational 

impacts. 

2-12 Folsom DS/FDR Final EIS/EIR – March 2007 
RIGHT WING

DAM

DIKE 7

CSAD7S

DIKE 8

FOLSOMDAM

LEFT WINGDAM

PROPOSEDAUXILIARY

SPILLWAY

MIADRightMIADRight

D2

CSAM

Folsom

Point

Folsom

Point

Overlook

Point

Overlook

Point

CSALWDE

CSAD7N

CSAD8

CSALWDS

0 1250

FEET

1:15,000

NORTH

Potential Construction ZonesPotential Borrow AreasPotential Contractor Use / Staging AreasSeasonal Staging AreaPotential Borrow Areas and PotentialContractor Use/ Staging Areas

Processing Only(Approximate Location)

Concrete and Processing(Approximate Location)465ft500ft425ft400ftHaul Route

Contours


DIKE 4

DIKE 5

DIKE 6

RIGHT WING

DAM

FOLSOM

DAM

Beals

Point

Granite

Bay

CSARWDS

CSA4NW

CSA4NE CSAD5N

CSAD5S

CSA4SE

CSAD6E

CSAD6S

CSARWDN



Figure 2-4

Preferred Alternative,

Right Wing Dam to Dike 4

0 1000

FEET

1:12,000

NORTH

Potential Construction Zones

Potential Borrow Areas

Potential Contractor Use / Staging Areas

Seasonal Staging Area

Processing Only

(Approximate Location)

Haul Route

465ft

500ft

425ft

400ft

Contours
Chapter 2 

Project Description 

 

1) Staging area(s) for work on the RWD at Beal’s Point recreation site was 

removed through construction of a staging platform south of the recreation 

area. 

2) Staging for work at Dikes 4, 5, and 6 would be in the immediate vicinity of 

the dikes, or would use the platform established south of Beal’s Point. These 

locations would be in areas typically not accessible by the general public and 

away from residential areas. 

3) Staging for work at the Auxiliary Spillway site would potentially be at 

multiple locations along the toe of the LWD, at the Observation Point, at a 

constructed platform at Dike 7, and at the D1/D2 location. 

4) Staging for work on MIAD would be at the D1/D2 location. 

To minimize potential impacts to recreation, staging areas at Beal’s Point and 

Folsom Point would be placed on constructed platforms or on adjacent unimproved 

areas a safe distance from primary recreational activities. Public safety would be 

maintained through the use of fencing or other similar measures. There would be 

nearly continuous public access to recreation areas and trails throughout the 

construction period through the use of traffic control measures and/or grade 

separated vehicular and/or pedestrian crossings and/or temporary alternate public 

access detours. Temporary closures could occur when completing construction of 

the grade separation itself or other access measures or to meet unforeseen project 

circumstances. In such cases, temporary closures would be accomplished during offpeak days or the off-season to minimize impacts on recreation activities. 

Reclamation’s Central California Area Office would notify local agencies and the 

general public and accept input in advance of any possible extended closure(s) that 

may be necessary due to unforeseen project circumstances. 

Cofferdams 

The Partner Agencies have eliminated cofferdams proposed at Dikes 7 and 8. This 

would result in fewer adverse water quality and recreation impacts. 

Materials Storage, Processing and Batch Plants 

The Partner Agencies currently anticipate that commercial and processed materials 

(cement, concrete aggregates, sand and gravel, steel etc.) required for the project 

would be obtained from local commercial off-site suppliers. The revised Preferred 

Alternative includes the option of conducting processing (crushing and screening) of 

materials excavated from the new Auxiliary Spillway site, but limits such activity to 

areas away from residential areas and off limits to public access. The change to the 

use of commercially acquired materials would reduce air quality, noise, viewshed, 

and recreational impacts. 

Folsom DS/FDR Final EIS/EIR – March 2007 2-15 
Chapter 2 

Project Description 

The revised Preferred Alternative includes the option to locate materials storage and 

processing facilities, with the exception of rock crushing equipment, at staging and 

stockpile areas shown on Figures 2-1, 2-3, and 2-4 of this document. Specifically: 

1) The jet grout materials storage and mixing facilities and a materials screening 

plant at MIAD have been relocated to the staging area D1/D2. 

2) Concrete batch and crushing and screening plants – In response to public 

comments on the Draft EIS/EIR, the option to locate a concrete batch plant at 

Folsom Point and/or MIAD was eliminated and location of such facilities is 

now consolidated to sites between the Auxiliary Spillway and the LWD 

and/or Observation Point areas. This could require relocation of existing 

structures and/or power lines below the LWD. 

2.3 Overview of the Folsom DS/FDR Alternatives 

The Draft EIS/EIR discussed five action alternatives and identified Alternative 3 – 

the JFP Auxiliary Spillway, with a 3.5-ft raise, as the least environmentally 

damaging alternative. The five original alternatives and their current status, within 

the context of this Final EIS/EIR are briefly described below. 

2.3.1 Alternative 1 – Fuseplug Auxiliary Spillway/No Dam Raise 

Alternative 1 differs from the Draft EIS/EIR Alternative 3 principally in that the 

Auxiliary Spillway dimensions would be shallower and wider and the control 

structure would be an earthen fuseplug. There would be no raise to any structure for 

flood water retention or additional freeboard. This alternative has been retained as 

an executable option in this Final EIS/EIR should the Corps not receive timely 

funding and/or realize hydrologic risk reduction measures by constructing the 6STG 

Auxiliary Spillway component of the revised Alternative 3. 

2.3.2 Alternative 2 – Fuseplug Auxiliary Spillway with Tunnel/Potential 

4-ft Dam Raise 

Alternative 2 incorporates a potential 4-ft dam raise with a fuseplug Auxiliary 

Spillway and gate-controlled tunnel spillway for better hydrologic control of large 

flood events. This alternative has been eliminated from further consideration. 

2.3.3 Alternative 3 – JFP Auxiliary Spillway/3.5-Ft Raise 

Alternative 3 is identified in this EIS/EIR as the Preferred Alternative (also termed 

Proposed Project/Proposed Action). The principle elements of Alternative 3 are a 

new Auxiliary Spillway controlled by 6 submerged tainter gates, dam safety 

modifications to the RWD, LWD, Dikes 4, 5, 6 and MIAD, flood damage reduction 

modifications to the existing emergency spillway gates and a 3.5-ft embankment 

raise. The revised Preferred Alternative differs from Alternative 3 in the Draft 

2-16 Folsom DS/FDR Final EIS/EIR – March 2007 
Chapter 2 

Project Description 

 

EIS/EIR in that the 3.5-ft raise, if constructed in conjunction with modification 

and/or replacement of the three emergency spillway gates and the 6STG Auxiliary 

Spillway, would only serve as additional freeboard for the Folsom facilities. The 

raise would not substantially increase the maximum reservoir water surface elevation 

above 480.5 ft. As a result, under the Corps’ Selected Plan, there would no longer be 

a need for additional flood easements or auxiliary dikes around the reservoir. The 

3.5-ft raise, constructed in conjunction with modification and/or replacement of the 

three emergency spillway gates and the 6STG Auxiliary Spillway, has been 

identified by the Corps as the Selected Plan within the Corps’ PAC report. 

Section 2.4.10 below generally describes potential environmental effects of the 3.5-ft 

raise. Effects were also previously included in the American River Watershed LongTerm Study Final EIS/EIR, February 2002. The 3.5-ft raise portion of the Corps’ 

Selected Plan will undergo further detailed design during the Corps’ preconstruction, engineering, and design phase. 

Reclamation would implement the dam safety modifications to address seismic and 

static concerns related to the Main Concrete Dam and six of the eleven earthen 

structures. Seismic modifications would be made to MIAD through foundation jet 

grouting in conjunction with a downstream overlay and the reinforcement of Main 

Concrete Dam existing gates and piers. Static modifications would be undertaken to 

the RWD and LWD, Dikes 4, 5 and 6 and MIAD. Reclamation would independently 

identify the final environmental mitigation and commitments for this effort under a 

stand-alone ROD. 

2.3.4 Alternative 4 – JFP Auxiliary Spillway/Potential 7-ft Raise 

Alternative 4 contains many of the same elements as Alternative 3 with the exception 

of a 7-ft raise for increased reservoir flood storage during large flood events. Based 

upon additional engineering analysis and considering public comments on the Draft 

EIS/EIR, the Partner Agencies are no longer considering Alternative 4 as a probable 

alternative. 

2.3.5 Alternative 5 – 17-ft Raise 

Alternative 5 was specifically developed to address both dam safety and flood 

damage reduction requirements without the construction of an Auxiliary Spillway. 

Alternative 5 would involve increased reservoir storage capacity to control large 

flood events. Based upon additional engineering analysis and considering public 

comments, Alternative 5 is no longer being considered by the Partner Agencies as a 

probable alternative. 

Folsom DS/FDR Final EIS/EIR – March 2007 2-17 
Chapter 2 

Project Description 

2.4 Folsom Dam Safety/Flood Damage Reduction 

Project Description (Revised Alternative 3) 

This section describes activities for the Folsom DS/FDR Preferred Alternative, based 

upon the current sequencing plans for implementing corrective measures at each of 

the 12 structures of the Folsom Facility (see Table 2-1). The information below 

describes the general construction features and processes and the basic construction 

schedule. The text is not a repeat of the project details provided in the Draft 

EIS/EIR. The reader is referred to Chapter 2 of the Draft EIS/EIR for additional 

information regarding description of the features, details on quantities, and the 

activities planned at each of the structures of the Folsom Facility, recognizing that 

certain information in the Draft EIS/EIR related to elements of Alternative 3 is 

superseded by the discussion in this Final EIS/EIR. 

2.4.1 Activity 1 – JFP Auxiliary Spillway Excavation Phase 1 

The first activity, scheduled for the fall 2007, would be initiation of site excavation 

of the proposed Auxiliary Spillway. Under this phase, a materials haul road would 

be constructed from the Auxiliary Spillway site at the LWD to the vicinity of MIAD, 

stockpile and/or staging areas would be set up at the LWD (CSALWDS2), 

Observation Point (CSALWDE), at Dike 7 (CSAD7), and area D1/D2 

(CSAMIADN, CSAMIADS) near MIAD. Excavation of up to 860,000 cubic yards 

(cy) of soil and rock from the Auxiliary Spillway site would occur. The excavated 

materials would be hauled primarily to area D1/D2 near MIAD as a temporary 

stockpile. Excess material would be permanently stockpiled at staging/stockpile 

areas, principally below the LWD (CSALWDS) and the Observation Point 

(CSALWDE), Dike 7 (CSAD7), in-reservoir at the southern portion of Folsom Point 

adjacent to the right groin of MIAD (CSAD8), and area D1/D2 (CSAMIADN, 

CSAMIADS). CSAMIADS and CSAD8 sites could potentially be used for 

permanent stockpiling should capacity at primary sites below the LWD 

(CSALWDS) and observation point (CSALWDE) area be insufficient or to meet 

unforeseen project exigencies. The contractor staging areas (CSAs) described above 

are shown on Figures 2-3 and 2-4. 

The principle work schedule would include a 24 hour work day over two principal 

productions shifts, 7 days per week. The work shifts would be approximately 12 

hours long with ancillary support activities occurring over a 24-hour period. Work 

activities with significant impacts to residential areas such as noise, dust, and light 

would be either mitigated by appropriate measures to less than significant and/or 

limited to traditional working days and hours and/or in conformance with local 

relevant permit requirements and/or ordinances. 

 

2

 Contractor staging area (CSA) locations as labeled on Figures 2-3 and 2-4. 

2-18 Folsom DS/FDR Final EIS/EIR – March 2007 
Chapter 2 

Project Description 

 

Haul Road Construction

Off site material transportation would be via off road haul trucks. Through ongoing 

engineering analysis, the Partner Agencies continue to evaluate equipment size and 

other conveyance methods to reduce all impacts. Movement of excavated material 

would involve a substantial number of haul truck round trips. To keep this amount of 

truck traffic off city streets, a haul road would be constructed primarily on federal 

property between the maximum high (480.5 ft) and normal operational water levels 

(425.0 to 466.0 ft) of the reservoir. The haul road would be approximately 40 ft 

wide and would be maintained to minimize dust production with water and/or dust 

surfactants. Public safety would be maintained through the use of fencing or other 

similar measures. Public recreation access would be nearly continuous through 

measures described in Section 2.5 and Chapter 4 of this document. 

This haul road would be in use intermittingly for approximately 8 years during all 3 

phases of the Auxiliary Spillway construction. Excavation of the spillway site would 

not occur continuously for all 8 years of spillway construction work. There would be 

several periods of time with no excavation. However, this internal road would be 

used as a general transportation route for traffic between the main concrete dam and 

MIAD until all work at MIAD has been completed. 

Upon completion of construction activities, the haul road would either be regraded to 

previous contours or partially regraded to provide a platform for future incidental 

benefit as a recreational trail. Future beneficial improvements may be undertaken by 

Reclamation under other authorities and/or other parties on approval by Reclamation, 

subject to future environmental, economic and other required analysis, but does not 

represent a commitment to provide such improvements as part of this EIS/EIR. 

Staging

Initial staging of equipment for the Phase 1 excavation would be at combinations of 

below the LWD, Observation Point, Dike 7 and adjacent to MIAD at area D1/D2. 

Staging is primarily required for contractor facilities such as offices, materials and 

equipment storage and processing facilities. A batch plant would not be required. 

Processing facilities would be limited to below the LWD, Observation Point, and/or 

D1/D2. 

Excavation

Excavation would be performed using standard earth moving equipment. 

Approximately one half to one-third of the material to be excavated during Phase 1 is 

bedrock, which requires drilling and blasting. Drilling and setting of charges would 

follow an approved blasting plan and permit. 

Folsom DS/FDR Final EIS/EIR – March 2007 2-19 
Chapter 2 

Project Description 

On-site Hauling

Hauling would occur in large off-road haul trucks. To the extent practicable, the 

Partner Agencies would use natural topography and stockpiled materials to reduce 

noise along haul routes and control fugitive dust emissions with combinations of 

water, dust control surfactants, and gravel. 

Off-site Hauling

With the exception of transport of construction equipment and miscellaneous 

supporting services to the Auxiliary Spillway site, there would not be a substantial 

need for hauling of materials to the site during Phase 1. There would be a daily trip 

for a fueling truck during this phase, as well as for all other phases. The most likely 

route for the hauling in of construction equipment would be from US 50 using East 

Bidwell Street to East Natoma Street to Folsom Dam Road. 

Stockpiling

Stockpiling would occur primarily at locations near the LWD, Observation Point, 

Dike 7 and MIAD (identified in Figures 2-3 as CSALWDS, CSALWDE, CSAD7 

and CSAD8.) Permanent stockpiling at CSAD7, CSAMIADS, and CSAD8 may 

occur on a more limited basis if capacity at primary sites is exceeded or to meet 

unforeseen project exigencies. The majority of this material would be as part of the 

MIAD overlay (see Activity 6), or would be eventually recontoured as a permanent 

disposal site following all three phases of Auxiliary Spillway construction. 

Processing/Batch Plants

There would not be a need for a concrete batch plant under the Phase 1 excavation 

work. 

Relationship with Recreation Sites

To minimize potential impacts to recreation access and to provide safe access 

primarily to Folsom Point, the Partner Agencies would implement measures outlined 

in Section 2.5 and Chapter 4 of this document. Access to FLSRA and trails would be 

maintained with minimal disruption during the construction of the contractors’ haul 

routes, staging areas, and stockpiling work adjacent to Folsom Point through traffic 

control measures and/or grade separated vehicular and/or pedestrian crossings and/or 

temporary alternate public access detours. Temporary closures could occur when 

completing construction of the grade separation itself or other access measures or to 

meet unforeseen project circumstances. To the extent practicable, temporary 

closures would be accomplished off-season or during off-peak days to minimize 

impacts on recreation activities at Folsom Point. Reclamation’s Central California 

Area Office will notify local agencies and the general public and accept input in 

advance of any possible extended closure(s) that may be necessary due to unforeseen 

project circumstances. 

2-20 Folsom DS/FDR Final EIS/EIR – March 2007 
Chapter 2 

Project Description 

 

Schedule

Contractor mobilization for Phase 1 would start as early as September 2007, with 

activities lasting 12-18 months with expected completion in 2009. 

2.4.2 Activity 2 – Dam Safety Static Upgrades to the Right Wing Dam 

and Left Wing Dam 

The next activity planned under this project would be the proposed dam safety static 

upgrades to the RWD and LWD, starting in the late fall 2007. This would involve 

the installation of new filter material within the shells of the downstream faces of 

both earthen structures. The filter material would be obtained from local sand and 

gravel suppliers, although crushing and processing of spillway materials has been 

retained as an option. The existing shell material on the upper 20 ft of the 

downstream face would be removed, the filter materials installed, and the shell 

material replaced using standard construction equipment. 

Haul Road Construction

Construction of the overlay filters would be conducted along the crest and 

downstream face of both wing dams. The existing roads on the crest of the dams and 

along the toe of the dams would be used to support construction. The maintenance 

road along the toe would require an upgrade (i.e., filling and grading) to handle 

construction traffic, but no new roads are anticipated to support this activity. 

Staging

Staging of equipment for the construction work on the LWD would be at the 

Observation Point site (CSALWDE) and on the downstream side of the LWD along 

the toe (CSALWDS). Staging on the downstream side may be limited if the new 

Folsom Dam Bridge construction is concurrent with the LWD work. Two staging 

locations would be used for work on the RWD. The first staging area would be 

constructed south of Beal’s Point (CSARWDN), between the parking lot and the 

RWD. The second staging area would be downstream of the right abutment near the 

concrete dam (CSARWDS). In order to minimize potential impacts to recreation 

access and to provide safe access to Beal’s Point, the Partner Agencies would 

implement measures outlined in Section 2.5 and Chapter 4 of this document. 

Excavation and Filter Construction

Excavation would be performed using standard earth moving equipment. Shell 

material would be excavated and stockpiled along the toe or near the abutments of 

the wing dams while the filters are installed. Local commercial supplies would 

supply approximately 69,000 cy of fine and coarse filter material to the project sites. 

Consideration of onsite processed materials from the Auxiliary Spillway is under 

further evaluation. Filter material deliveries would be scheduled to minimize the 

need for stockpiling and double handling. The shell material would be replaced once 

the filter layer is installed. 

Folsom DS/FDR Final EIS/EIR – March 2007 2-21 
Chapter 2 

Project Description 

Off-site Hauling

Hauling of commercially processed material would occur in standard on-road haul 

trucks. Trucks would access the LWD from US 50 using East Bidwell Street to East 

Natoma Street to Folsom Dam Road. Trucks would access the RWD from Interstate 

80 (I-80) via Douglas Boulevard to Auburn-Folsom Road. Access to the RWD 

would be from both Beal’s Point and Folsom Dam Road. Truck drivers would be 

instructed to remain on established haul routes to avoid congested and residential 

areas. To the extent practicable, deliveries would be scheduled for non-commute 

hours. 

Processing/Batch Plants

There would not be a need for processing of excavated materials or a concrete batch 

plant to complete the filter work at the wing dams. 

Relationship with Recreation Sites

In order to minimize potential impacts to recreation access and to provide safe access 

primarily to Beal’s Point, the Partner Agencies would implement measures as 

outlined in Section 2.5 and Chapter 4 of this document. Construction activities at the 

RWD may require recreation accommodation measures for Beal’s Point. Access to 

Beal’s Point and trails would be maintained with minimal disruption during the 

construction of the contractors’ haul routes, staging areas, and stockpiling work 

adjacent to Beal’s Point through traffic control measures and/or grade separated 

vehicular and/or pedestrian crossings and/or temporary alternate public access 

detours. Temporary closures could occur when completing construction of the grade 

separation itself or other access measures or to meet unforeseen project 

circumstances. To the extent practicable, temporary closures would be accomplished 

off-season or during off-peak days to minimize impacts on recreation activities at 

Beal’s Point. Reclamation’s Central California Area Office will notify local agencies 

and the general public and accept input in advance of any possible extended 

closure(s) that may be necessary due to unforeseen project circumstances. 

Schedule

Contractor mobilization would start as early as October 2007 with work completed 

by November 2008. This activity would overlap with Activity 1 – JFP Auxiliary 

Spillway Excavation Phase 1. 

2.4.3 Activity 3 – Dam Safety Jet Grouting of MIAD Foundation 

The third activity would be the stabilization of the foundation at MIAD using a jet 

grouting process. Start of jet grouting is currently scheduled for summer 2008. Soil 

borings would be drilled using special drilling equipment. Borings would be drilled 

through the potentially unstable dredged alluvial or historic alluvial material and then 

into the underlying bedrock. Once the desired depth is achieved, a concrete-based 

grout would be injected and extruded into the subsurface using jets along the side of 

2-22 Folsom DS/FDR Final EIS/EIR – March 2007 
Chapter 2 

Project Description 

 

the drill pipe. The grout would be injected under high pressure into the formation, 

filling voids. Exploratory borings would be drilled into the grout columns to verify 

the extent that voids are filled and the grout has set and hardened. The exploratory 

borings would be backfilled with concrete. 

Presently, the Partner Agencies anticipate that approximately 1,360 borings would be 

drilled for jet grouting purposes. Within each boring, approximately 26 tons of grout 

would be injected. During grouting, drilling cuttings, water, and grout would be 

brought to the surface. This waste material would be directed to temporary, lined 

settling pits for solidification, removal, and disposal. It is anticipated that up to 70 

cy of waste material would be generated at each bore hole. This material would be 

dried and stockpiled on-site. Eventually the dried material would be incorporated 

into the downstream shell of MIAD (see Activity 6) pending review and approval by 

the Regional Water Quality Control Board (RWQCB) of chemical inertness tests of 

the wasted material. 

Haul Road Construction

Existing roads within the project site would be utilized. These roads would be 

upgraded to receive construction traffic, but no new roads will be necessary. To the 

extent practicable, the Partner Agencies would use natural topography and stockpiled 

materials to reduce noise along haul routes and control fugitive dust emissions by use 

of combinations of water, dust control surfactants, and gravel. In response to public 

comments on the Draft EIS/EIR, mitigation requirements identified in Section 2.5.2 

would be implemented to control dust and noise. 

Staging

Staging of equipment for the jet grouting work would be on federal property 

downstream of MIAD (CSAMIADN). This area currently has limited recreation use; 

however, in order to minimize potential impacts to recreation access and to provide 

safe access to adjacent recreation trails, the Partner Agencies would implement 

measures outlined in Section 2.5 and Chapter 4 of this document. 

Off-site Hauling

Grout material would be hauled to the site in on-road trucks. Although there would 

be a silo at the site to store some raw material, it is expected that grout deliveries 

would be at the rate that grout is being injected. Approximately 10 deliveries would 

be expected each work day. Truck drivers would be instructed to remain on 

established haul routes to avoid congested and residential areas. To the extent 

practicable, deliveries would be scheduled during non-commute hours. The most 

likely traffic route would be from US 50 using East Bidwell Street and Green Valley 

Road. 

Folsom DS/FDR Final EIS/EIR – March 2007 2-23 
Chapter 2 

Project Description 

Processing/Batch Plants

A grout processing plant would be established at the MIAD staging area. This plant 

would mix the dry grout, brought to the site in enclosed trailers, with water to a 

consistency meeting the injection standards. To the extent practicable, the Partner 

Agencies would use natural topography and stockpiled materials to reduce noise 

during processing and grout plant operations. 

Relationship with Recreation Sites

Jet grouting at MIAD is not expected to affect any recreation facilities. This area 

currently has limited recreation use; however, in order to minimize potential impacts 

to recreation access and to provide safe access to adjacent recreation trails, the 

Partner Agencies will implement measures outlined in Section 2.5 and Chapter 4 of 

this document. 

Schedule

Contractor mobilization would start as early as July 2008 with work completed by 

late fall 2009. This activity would overlap with Activity 1 - Phase 1 of the JFP 

Auxiliary Spillway excavation and Activity 2 - Dam Safety static upgrades to the 

RWD and LWD. 

2.4.4 Activity 4 – JFP Auxiliary Spillway Excavation Phase 2 

Construction of the JFP Auxiliary Spillway and 6STG control structures would be 

accomplished during three phases. The first phase described above represents the 

initial excavation and removal of up to 860,000 cy of material. During the second 

phase, substantially more material, up to 2.0 million cy, would be removed in 

advance of Phase 3 (see Activity 9). This would involve excavation of the approach 

channel, control structure, chute, and stilling basin. The material excavated as part of 

Phase 2 would be substantially rock that requires blasting. One part of Phase 2 

would be reinforcing the site slopes using rock bolts, wire mesh, etc., as necessary. 

Under this phase, the same haul road constructed for Phase 1 would be used to haul 

material to the Dike 7 and MIAD areas with modifications. Staging areas and 

materials stockpiling areas would be set up downstream of the LWD, at the 

Observation Point, at Dike 7, and at the D1/D2 locations. 

Haul Road Construction

The existing haul road would be maintained to keep truck traffic on federal property 

and off city streets. It is anticipated that continuous maintenance of the haul road 

would be necessary due to the high volume of traffic and material hauled on it. 

Principle material distribution is assumed via off road haul trucks; however, through 

continued engineering analysis, the Partner Agencies continue to evaluate equipment 

size and other conveyance methods to reduce all impacts. Movement of excavated 

material would involve a significant number of haul truck round trips. To keep this 

2-24 Folsom DS/FDR Final EIS/EIR – March 2007 
Chapter 2 

Project Description 

 

amount of truck traffic off city streets, a haul road primarily on federal property 

(described in Activity 1) would be modified accordingly between the maximum high 

(480.5 ft) and normal operational water levels (425.0 to 466.0 ft) of the reservoir. 

The haul road would be approximately 40 ft wide and would be maintained to 

minimize dust production with water and/or dust surfactants. To the extent 

practicable, the Partner Agencies would use natural topography and stockpiled 

materials to reduce noise along haul routes and control fugitive dust emissions by use 

of combinations of water, dust control surfactants, and gravel. Public safety would be 

maintained via fencing or other similar measures. Public recreation access would be 

nearly continuously as described in Section 2.5 and Chapter 4 of this document. 

Staging

Staging of equipment and materials for the Phase 2 excavation would be primarily at 

the LWD, Observation Point, and area D1/D2. These areas are away from principle 

recreation areas; however, to minimize potential impacts to recreation access and to 

provide safe access to adjacent recreation trails, the Partner Agencies will implement 

measures outlined in Section 2.5 and Chapter 4 of this document. 

Excavation

Excavation would be performed using standard earth moving equipment. The 

majority of the material to be excavated during Phase 2 is bedrock, which would 

require drilling and blasting. 

On-site Hauling

Hauling would occur in large off-road haul trucks as described in Activity 1. To the 

extent practicable, the Partner Agencies would use natural topography and stockpiled 

materials to reduce noise along haul routes and control fugitive dust emissions by use 

of combinations of water, dust control surfactants, and gravel. 

Stockpiling

Stockpiling would occur as described in Activity 1. 

Off-site Hauling

Iron and steel to stabilize the excavation slopes would be hauled from off-site. 

Production of concrete would require hauling of cement and gravel to the batch plant 

site. Hauling of this material would be in standard highway haul trucks. The most 

likely transportation route from US 50 would be East Bidwell Street to East Natoma 

Street to Folsom Dam Road. To the extent practicable, deliveries would be 

scheduled for non-commute hours. 

Processing/Batch Plants

This activity may require processing of excavated rock to produce sufficient material 

for the MIAD overlay. Processing would involve the use of a large material 

screening device termed a “grizzly.” The grizzly would separate large rocks from 

Folsom DS/FDR Final EIS/EIR – March 2007 2-25 
Chapter 2 

Project Description 

finer materials. The finer materials would then be crushed and screened for use in 

filters or drains or as part of the MIAD overlay, while the larger materials would be 

used as riprap along the faces of dikes and wing dams or disposed of permanently at 

the LWD (CSALWDS), Observation Point (CSALWDE), Dike 7 (CSAD7), and/or 

D1/D2 (CSAMIADN/S) locations. To produce concrete for the spillway chute, a 

concrete batch plant would be set up near the spillway site (Observation Point plus 

the area below LWD) or area CSAMIADN/S. There would be no batch plant at 

Folsom Point/Dike 8 proper as described in the Draft EIS/EIR. To the extent 

practicable, the Partner Agencies would use natural topography and stockpiled 

materials to reduce noise during processing and batch plant operations. 

Relationship with Recreation Sites

These areas currently have limited recreation use; however, to minimize potential 

impacts to recreation access and to provide safe access to adjacent recreation trails, 

the Partner Agencies will implement measures outlined in Section 2.5 and Chapter 4 

of this document. 

Schedule

Contractor mobilization for Phase 2 would start in September 2010 and continue to 

January 2014. 

2.4.5 Activity 5 – Dam Safety Dike 5 Static Repair 

Under Reclamation's Dam Safety Program, Dike 5 would be subject to modifications 

to control seepage. This would involve placement of a sand filter within the 

downstream face in a fashion similar to that performed for the wing dams. Existing 

shell material would be removed, filter material placed, and the shell material 

replaced, along with additional material from borrow. Trucks would haul filter 

material to the project site from commercial off-site sources. 

Haul Road Construction

The existing maintenance roads along the crest and along the toe of the downstream 

side of Dike 5 would be improved to receive haul truck traffic. The use of Dike 5 as 

a recreation trail would be closed for the duration of the construction and a 

temporary detour would be constructed nearby. To the extent practicable, the Partner 

Agencies would use natural topography and stockpiled materials to reduce noise 

along haul routes and control fugitive dust emissions by use of combinations of 

water, dust control surfactants, and gravel. 

2-26 Folsom DS/FDR Final EIS/EIR – March 2007 
Chapter 2 

Project Description 

 

Staging

Staging would take place near Dike 5 (CSAD5S, CSAD5N) in one of the areas 

designated for staging. These areas currently have limited recreation use; however, 

to minimize potential impacts to recreation access and to provide safe access to 

adjacent recreation trails, the Partner Agencies would implement measures as 

outlined in Section 2.5 and Chapter 4 of this document. 

Excavation

The Partner Agencies assume that material stockpiled from the Auxiliary Spillway 

may be used for supplemental shell material. In the event of unforeseen 

circumstances, shell material for Dike 5 could be excavated from the reservoir 

shoreline, north of Beal’s Point below Mooney Ridge. Supplemental borrow site 

requirements would limited to in-reservoir areas, between elevation 400.0 and 425.9 

ft, north of Beal’s Point at an area below Mooney Ridge and the cove area below 

Dike 8. 

Optimization of borrow operations would substantially reduce the adverse effects 

presented in the Draft EIS/EIR by reducing potential in-reservoir traffic, air quality, 

recreation and noise impacts on roadways and to communities adjacent to the 

reservoir. Reclamation’s Central California Area Office will notify local agencies 

and the general public and accept input prior to initiating supplemental borrow 

activities at this sites. 

On-site Hauling

As needed, supplemental excavated material from either the Auxiliary Spillway, 

various stockpiles and/or the reservoir area borrow below Mooney Ridge would be 

transported directly to the Dike 5 project site using an internal construction road. 

Traffic would be separated from public either through a grade separation or via a 

controlled, secured intersection with a traffic control measure, public detour, or other 

engineered mechanism. 

Off-site Hauling

Processed material for filters and drains would be obtained from a local commercial 

source or sources. Auburn-Folsom Road would be used as the primary artery for 

commercial material transport. 

Materials Screening

There would not be a need for rock crushing and/or a concrete plant at Dike 5. If 

necessary to produce material of proper size for additional shell material for the Dike 

5 modifications, a materials separating plant (grizzly and screening only) would be 

established north of Beal’s Point. This plant would separate large rocks from finer 

material. The large rocks would be placed near the processing site and the finer 

material hauled to Dike 5. 

Folsom DS/FDR Final EIS/EIR – March 2007 2-27 
Chapter 2 

Project Description 

Relationship with Recreation Sites

Beal’s Point or the Dike 5 access road would be the primary access point for Dike 5 

work. In order to minimize potential impacts to recreation access and to provide safe 

access to adjacent recreation trails, the Partner Agencies would implement measures 

outlined in Section 2.5 and Chapter 4 of this document. 

Schedule

Contractor mobilization would start in September 2009 with the majority of the work 

accomplished during the winter. Completion is expected in May 2010. This activity 

would overlap for several months with the completion of Activity 3 – Dam Safety Jet 

Grouting of MIAD Foundation. 

2.4.6 Activity 6 – Dam Safety MIAD Overlay 

To address seismic concerns for dam safety of this earthen structure, an earthen 

overlay would be constructed on the downstream side of MIAD. This activity would 

involve excavation of a portion of the downstream fill, placement of a filter layer, 

replacement of shell, and placement of an overlay of approximately up to 2 million 

cy. The material for the overlay would be obtained from the D1/D2 stockpile site 

(material originally excavated from the Auxiliary Spillway site and waste material 

from the jet grouting program). Filter material would be transported from an off-site 

commercial source or processed at the Auxiliary Spillway. 

Haul Road Construction

The Partner Agencies would construct a haul road from the stockpile for trucks to 

haul overlay material to MIAD. 

Staging

Staging of equipment and materials would be at the CSAMIADN/S locations and at 

the downstream toe of MIAD. 

On-site Hauling

Trucks would haul overlay material from the CSAMIADN/S locations using internal 

construction roads. 

Off-site Hauling

For filter material obtained from a local commercial source or sources, East Bidwell 

and Green Valley Road would be used as the primary artery for transport from US 

50. 

Processing/Batch Plants

Though not anticipated in Auxiliary Spillway Excavation Phase 2, the Partner 

Agencies retain an option to process material via rock crushing and screening at the 

Auxiliary Spillway site. If a commercial source is not available, the material for the 

overlay would be obtained from already processed materials as part of the Auxiliary 

2-28 Folsom DS/FDR Final EIS/EIR – March 2007 
Chapter 2 

Project Description 

 

Spillway Phase 2 excavation. No concrete batch plant would be required. To the 

extent practicable, the Partner Agencies would use natural topography and stockpiled 

materials to reduce noise during processing and batch plant operations. 

Relationship with Recreation Sites

The trail along the top of MIAD would be closed to foot traffic during the 

construction period and alternate access to trails will be provided where practical. In 

order to minimize potential impacts to recreation access and to provide safe access to 

adjacent recreation trails, the Partner Agencies will implement measures outlined in 

Section 2.5 and Chapter 4 of this document. 

Schedule

Contractor mobilization would start in the summer 2015 and continue until the 

spring 2017. 

2.4.7 Activity 7 – Dam Safety Dikes 4 and 6 Static Repair 

To address Dam Safety concerns, both Dikes 4 and 6 would receive static control 

modifications consisting of sand filter upgrades as described for Dike 5. This repair 

would involve placement of a filter within the downstream face in a fashion similar 

to that performed for Dike 5. Existing shell material would be removed, filter 

material placed, and the shell material replaced, along with additional material from 

borrow. Filter material would be hauled to the project site from off-site sources. 

Supplemental additional shell material would be excavated from the reservoir 

shoreline, north of Beal’s Point. Staging would be adjacent to each dike in areas 

identified for that purpose. 

Haul Road Construction

The Partner Agencies would improve the existing maintenance roads along the crests 

and along the toes of the downstream portions of Dikes 4 and 6 to receive haul truck 

traffic. The recreational trails affected by the truck traffic would be relocated to 

allow the trails to stay open during construction. The use of Dike 5 as a recreation 

trail would be closed for the duration of the construction and a temporary detour 

would be constructed nearby. 

Staging

Staging of equipment and materials would be adjacent to each dike (see locations 

CSAD4NW, CSAD4NE, CSAD4SE, and CSAD6E.) 

On-site Hauling

Excavated material from either the Auxiliary Spillway site or – as circumstances 

require – the reservoir area borrow north of Beal’s Point would be transported 

directly to each dike using internal construction roads. 

Folsom DS/FDR Final EIS/EIR – March 2007 2-29 
Chapter 2 

Project Description 

Off-site Hauling

Filter material would be obtained from a local commercial source or sources. Trucks 

would use Auburn-Folsom Road as the primary artery for commercial transport. 

Materials Screening

There would not be a need for a concrete plant to support work at either dike. If 

necessary to produce material of proper size for additional shell material, a materials 

separating plant (grizzly and or screening only) could be established north of Beal’s 

Point. This plant would separate large rocks from finer material. The large rocks 

would be placed near the processing site(s) and the finer material hauled to Dikes 4 

and 6. To the extent practicable, the Partner Agencies would use natural topography 

and stockpiled materials to reduce noise during processing operations. 

Relationship with Recreation Sites

Beal’s Point would be the primary access point for Dike 4, 5 and 6. For Dike 4 and 5 

staging areas would be utilized that are separated from the principle recreation areas; 

however, to minimize potential impacts to recreation access and to provide safe 

access to adjacent recreation trails, the Partner Agencies will implement measures 

outlined in Section 2.5 and Chapter 4 of this document. Dike 6 is in very close 

proximity to Beal’s Point and the intersection of numerous trails and recreational 

facilities. Access to Beal’s Point and trails would be maintained with minimal 

disruption during the construction of the contractors’ haul routes, staging areas, and 

stockpiling work through traffic control measures and/or grade separated vehicular 

and/or pedestrian crossings and/or temporary alternate public access detours. 

Temporary closures could occur when completing construction of the grade 

separation itself or other access measures or to meet unforeseen project 

circumstances. To the extent practicable, temporary closures would be accomplished 

off-season or during off-peak days to minimize impacts on recreation activities at 

Folsom Point. Reclamation’s Central California Area Office will notify local 

agencies and the general public and accept input in advance of extended closure(s). 

Schedule

Contractor mobilization would start in September 2017 with the majority of the work 

to be accomplished during the winter to minimize recreation impacts. Completion is 

expected for April 2018. 

2.4.8 Activity 8 – Dam Safety Main Concrete Dam Seismic 

Improvements and Repairs 

To provide better seismic stability and to upgrade the spillway gates and piers for 

dam safety, the Main Concrete Dam would be subject to a series of improvements. 

These include installation of tendons through the spillway piers into the Main 

Concrete Dam’s monoliths to tie the piers and monoliths together, installation of 

steel members to the spillway piers, and modifications to the spillway gates. 

2-30 Folsom DS/FDR Final EIS/EIR – March 2007 
Chapter 2 

Project Description 

 

Pier Tendon Installation

Tendons would be installed through the piers by drilling a borehole into the concrete 

blocks, inserting the tendon, and grouting the tendon in place. After drilling the 

hole, the tendon would be inserted, anchored, and tensioned. The tendon and hole 

would then be grouted to the surface. There are 6 tendons anticipated per pier and 7 

piers that require anchoring. 

Spillway Pier Wraps and Braces

The pier wraps and braces would consist of installation of steel plates on the existing 

piers and steel braces between the piers. This would involve drilling for insertion of 

bolts. This work would not involve substantial staging areas or cause haul truck 

issues. 

Spillway Gate Modifications

Work on the spillway gates would involve structural modifications and metal plate 

bracing. This work would not involve substantial staging area or cause haul truck 

issues. 

Haul Road Construction

The existing dam maintenance roads would be used to access the project sites. 

Staging

Staging of equipment and materials would be at CSALWDS. 

Off-site Hauling

Off-site hauling would include the tendons, grout material, braces, metal plates, and 

miscellaneous supplies such as bolts. 

Processing/Batch Plants

A small grout mixing plant would be established near the Main Concrete Dam at one 

of the established staging areas to produce grout for the tendon installation. No other 

processing would be required. 

Relationship with Recreation Sites

There would not be a need to close recreation sites for this work. The work area is 

inaccessible to the public. 

Schedule

Work on the pier tendons is scheduled to start in January 2014 and would take 

approximately 14 months. Work on the spillway pier wraps and braces would start 

in August 2016 and take approximately 20 months to complete. The spillway gate 

repairs would start in January 2018 and take over 2.5 years. 

Folsom DS/FDR Final EIS/EIR – March 2007 2-31 
Chapter 2 

Project Description 

2.4.9 Activity 9 – JFP Auxiliary Spillway Excavation Phase 3 

Phase 3 would involve construction of the JFP Auxiliary Spillway’s approach 

channel, control structure, chute, and stilling basin. This includes the removal of 

approximately up to 500,000 cy of material to excavate the approach channel and 

control structure that would house the submerged tainter gates. A substantial amount 

of concrete would be required to construct and line the approach channel, control 

structure, spillway chute, and stilling basin. Under this phase, the same haul road 

constructed for Phase 1 would be used to haul material to the Observation Point, 

Dike 7, and D1/D2 areas. Staging areas would be set up near the spillway site and/or 

at D1/D2. Activity 9 represents the completion of the 6STG portion of the Corps’ 

Selected Plan. The Corps continues to evaluate design criteria. 

Haul Road Construction

The existing haul road would be maintained to keep truck traffic on federal property 

and off city streets. It is anticipated that continuous maintenance of the haul road 

would be necessary. To the extent practicable, the Partner Agencies would use 

natural topography and stockpiled materials to reduce noise along haul routes and 

control fugitive dust emissions by use of combinations of water, dust control 

surfactants, and gravel. 

Staging

Staging of equipment and materials for the Phase 3 excavation would be primarily at 

the LWD (CSALWDS), Observation Point (CSALWDE), and MIAD 

(CSAMIADN/S) areas. These areas are away from principle recreation areas; 

however, to minimize potential impacts to recreation access and to provide safe 

access to adjacent recreation trails, the Partner Agencies would implement measures 

outlined in Section 2.5 and Chapter 4 of this document. 

Excavation

Excavation would be performed using standard earth moving and dredging 

equipment. 

On-site Hauling

Hauling would occur in large off-road haul trucks. To the extent practicable, the 

Partner Agencies would use natural topography and stockpiled materials to reduce 

noise during processing and batch plant operations. 

Stockpiling

Stockpiling would primarily occur at the Observation Point area. The majority of 

this material would be either used as part of a permanent stockpile, or the stockpile 

site eventually would be recontoured as a permanent disposal site. 

2-32 Folsom DS/FDR Final EIS/EIR – March 2007 
Chapter 2 

Project Description 

 

Off-site Hauling

Production of concrete would require hauling of commercially sourced cement and 

gravel to the batch plant site near the Auxiliary Spillway construction site. Hauling 

of this material would be in standard highway haul trucks. 

Processing/Batch Plants

To produce concrete for the spillway approach and control structure, a concrete batch 

plant would be set up near the spillway site and/or Observation Point and/or D1/D2. 

To the extent practicable, the Partner Agencies would use natural topography and 

stockpiled materials to reduce noise during processing and batch plant operations. 

Relationship with Recreation Sites

These areas are separated from principle recreation areas; however, to minimize 

potential impacts to recreation access and to provide safe access to adjacent 

recreation trails, the Partner Agencies would implement measures outlined in Section 

2.5 and Chapter 4 of this document. 

Schedule

Contractor mobilization for Phase 3 would start during the fall 2011 and continue 

into the late fall 2014. 

2.4.10 Activity 10 – Flood Damage Reduction 3.5-ft Raise of Dam 

Structures 

The last activity related to flood damage reduction actions would be modification 

and/or replacement of the existing emergency spillway gates and a 3.5-ft raise of all 

embankments using either a parapet wall design on top of all facilities or through an 

earthen raise. Relative to the revised Preferred Alternative, this 3.5-ft raise would be 

to provide additional freeboard capacity and is not necessary to raise the reservoir 

surface water elevation as related to flood damage reduction objectives. The parapet 

wall raise is described below and potential environmental effects of the raise are 

discussed generally in this document and in the American River Watershed LongTerm Study Final EIS/EIR, February 2002. Activity 10 represents the completion of 

the additional flood damage reduction portions of the Corps’ Selected Plan as 

identified in the PAC Report. The Corps continues to evaluate design criteria during 

the Corps’ pre-construction, engineering, and design phase. 

The parapet wall raise would involve excavating a small portion of the top of each 

earthen structure to receive the base of the parapet wall, constructing forms to 

receive cement, pouring the cement, removing the forms for the next construction 

length, and replacing/backfilling of filter and removing shell material. Existing 

maintenance roads would be used to access the construction sites; there would not be 

a need for new roads. Staging would be conducted at each site. 

Folsom DS/FDR Final EIS/EIR – March 2007 2-33 
Chapter 2 

Project Description 

Haul Road Construction

There would not be a need for haul roads for the embankment raise. 

Staging

Staging would occur adjacent to each earthen structure. 

Excavation

Excavation of the crown of each dike and wing dam would be performed using 

standard earth moving equipment. One daylight shift is anticipated on a 5 day per 

week schedule. 

On-site Hauling

Any hauling of materials on-site would be in smaller, on-road type vehicles. 

Stockpiling

Temporary stockpiling of materials would occur adjacent to each facility. 

Off-site Hauling

Concrete for the parapet walls would be produced at a commercial site batch plant 

and hauled to the project site in rotary concrete trucks. There would not be concrete 

production at the site. If an earthen raise is done, material needed for construction 

would be hauled to the project site from a commercial source. 

Processing/Batch Plants

There would not be a need for a concrete batch plant at the site. 

Schedule

Contractor mobilization for the parapet wall raise would start in May 2010 and 

continue to June 2014. The smaller facilities such as Dikes 1, 2, and 3, would 

require several weeks to install the parapet wall. Larger facilities, such as the RWD, 

would require several months. 

2.4.11 Ancillary Actions 

There are several actions related to the Folsom DS/FDR project that have not been 

completely defined at this time. These actions include dredging mechanism for the 

spillway approach channel construction and new Auxiliary Spillway stilling basin 

construction. 

Spillway Approach Channel Construction

Construction of portions of the approach channel to the new Auxiliary Spillway 

would require “wet” work below the water level of the reservoir. It is anticipated 

that some form of dredging would be required to excavate some of the material. The 

specific dredging method and materials handling processes are not known at this 

time. The detailed design on the spillway approach channel, including dredging and 

2-34 Folsom DS/FDR Final EIS/EIR – March 2007 
Chapter 2 

Project Description 

 

materials handling, would be determined in the Corps’ pre-construction, engineering, 

and design phase and if needed, supplemental NEPA/CEQA documentation would 

be prepared. 

Auxiliary Spillway Stilling Basin

The new Auxiliary Spillway would require a stilling basin at the point where the 

channel would enter the American River. Details regarding the stilling basin and 

how it would be constructed are currently being refined by Reclamation. 

Reclamation would issue a supplemental environmental document on the 

construction of the stilling basin if needed, in consultation with National Marine 

Fisheries Service and the USFWS once those details are known. 

2.5 Commitments 

This section presents the environmental commitments proposed by the Folsom 

DS/FDR Partner Agencies. 

2.5.1 Recreation Mitigation Limitations 

Reclamation under the authority of the Safety of Dams Act, under which 

Reclamation exercises its authority to make the proposed Folsom Facility 

improvements, can mitigate for damages to recreation facilities and take actions to 

ensure recreational access is maintained, but it cannot provide additional recreational 

benefits (i.e., Reclamation cannot provide recreational enhancements). Reclamation 

and the Corps authorities related to recreation include but are not limited to: 

1) Section 4, 1944 Flood Control Act (P.L. 78-534) as amended, Federal Water 

Project Recreation Act 1965 (P.L. 89-72) as amended; 

2) Section 103(c)(4) and 103(e) Water Resources Development Act 1986 as 

amended; and 

3) Reclamation Projects Authorization and Adjustments Act, Section 2804 (P.L. 

102-575). 

As public stewards of the Federal interests and property of which the project is being 

undertaken, Reclamation and the Corps acknowledge the potential exists in the 

future to provide new beneficial recreational or other improvements that could be 

made to remnant unimproved platforms following completion of project 

construction. Such potential improvements are viewed at this time as being 

consistent with conceptual plans put forth in the Draft Folsom Lake State Park 

Resource Management Plan and with other local recreation plans. These plans are 

conceptual in nature at this time and are not funded and/or approved plans and not 

considered an existing project future condition and thus are not required to be 

considered as offsetting mitigation for potential impacts. Future beneficial 

Folsom DS/FDR Final EIS/EIR – March 2007 2-35 
Cha

Proje

2-36

pter 2 

ct Description 

 Folsom DS/FDR Final EIS/EIR – March 2007 

improvements may be undertaken by Reclamation under other authorities and/or by 

the Corps or other parties on approval by Reclamation, subject to future 

environmental, economic and other required analysis but does not represent a 

commitment to provide such improvements as part of this EIS/EIR. 

2.5.2 Folsom DS/FDR Mitigation Commitments 

Table 2-2 identifies mitigation commitments as part of the Folsom DS/FDR. These 

commitments relate to potential environmental impacts of the actions that would 

occur under the Preferred Alternative. 

2.6 Unresolved Issues 

Some actions have not been fully defined in this project description primarily 

because engineering methods have not been determined. These actions include the 

spillway approach channel, the Auxiliary Spillway stilling basin, a 3.5-ft raise, and 

grade separation activities at Beal’s Point. Reclamation and/or the Corps will 

supplement these actions, as needed, to comply with CEQA and NEPA, as further 

described below. 

The dredging mechanism for the spillway approach channel construction is currently 

not known. Methods could involve in-reservoir excavation, which could result in 

additional environmental impacts. The detailed design on the spillway approach 

channel including dredging and materials handling would be determined in the 

Corps’ pre-construction, engineering, and design phase and if needed, supplemental 

NEPA/CEQA documentation would be prepared. 

The new Auxiliary Spillway would require a stilling basin at the point where the 

channel would enter the American River. Details regarding the stilling basin and 

how it would be constructed are currently being refined by Reclamation. 

Reclamation would issue a supplemental environmental document on the 

construction of the stilling basin if needed, in consultation with National Marine 

Fisheries Service and the USFWS once those details are known. 

The engineering for the 3.5-ft raise is currently not determined and could include a 

parapet wall or an earthen raise. In conjunction with the raise, additional hydrologic 

evaluation of Dike 1 would need to occur. The detailed design on the 3.5-ft raise 

including dredging and materials handling would be determined in the Corps’ preconstruction, engineering, and design phase and if needed, supplemental 

NEPA/CEQA documentation would be prepared. 

Grade separation activities at Beal’s Point could occur to maintain access for 

recreational activities. Currently, a technique for grade separation, including the 

route and alignment are not known. Supplemental NEPA/CEQA documentation 

may be necessary to evaluate environmental impacts of grade separation actions. 
Table 2-2 

Folsom Dam Safety/Flood Damage Reduction EIS/EIR Impacts and Mitigation Measures 

Impact Being Mitigated 

Relevant 

Mitigation 

Measures 

Level of 

Significance 

With 

Mitigation3 List of Mitigation Measures for each R

Hydrology/Water Quality /Groundwater 

HWQ-1: The responsible Federal Agency working with thContractor will obtain an NPDES permit prior to construccommencing by filing a Notice of Intent (NOI) with the CeWater Quality Control Board (CVRWQCB} and preparing Prevention Plan (SWPPP). 

Construction-related activities related to earth moving operations, storage and handling of construction materials on site, and operation and maintenance of construction equipment and vehicles could affect water quality within the reservoir or small local tributaries leading to the reservoir. Soil erosion associated with excavating material and re-grading may transport sediment into local tributaries or directly into the reservoir. 

HWQ-1, HWQ-2, HWQ-3, HWQ-9 

 LTS 

HWQ-2: The responsible Federal Agency working with thContractor will incorporate measures to control on-site spaddition to the spill prevention and control Best Managempresented above, the SWPPP will contain a visual monit

chemical monitoring program for pollutants that are non-if there is a failure of BMPs. 

Jet grouting at the downstream foundation of MIAD would affect water quality. 

HWQ-4, HWQ-5, HWQ-6, HWQ-7, HWQ-8 

 LTS HWQ-3: The responsible Federal Agency working with th

Contractor will prepare and obtain permits abided by as sSection 404 of the Clean Water Act (CWA) regarding dreof the United States, and activities involving discharging include wetlands, respectively. 

3 LTS = Less than significant with mitigation. 4 Unless otherwise specified, for mitigation measures that refer to “responsible Federal agency”, the Corps is responsible for impac

mitigation related to flood damage reduction construction activities; for all other construction-related project impacts and correspoReclamation is the responsible Federal agency. 

Folsom DS/FDR Final EIS/EIR – March 2007 
Chapter 2 

Project Description 

Table 2-2 

Folsom Dam Safety/Flood Damage Reduction EIS/EIR Impacts and Mitigation Measures 

Impact Being Mitigated 

Relevant 

Mitigation 

Measures 

Level of 

Significance 

With 

Mitigation3 List of Mitigation Measures for each R

HWQ-4: Reclamation will perform jet grouting tests at MoDam (MIAD) prior to implementing the full jet grouting acmonitoring for any grout leakages as well as the testing osurface water levels and quality. If Reclamation determiexpected to occur and could cause adverse water quality construct a cutoff wall before they jet grout the foundatioeliminate the migration of the grout, metals released from water impacts to surrounding waters.

Jet grouting at the downstream foundation of MIAD would reduce the water source for a portion of the wetlands. 

HWQ-5 LTS 

Construction actions such as in-reservoir dredging would cause adverse water quality effects from mercury and metals in the reservoir. 

HWQ-12, HWQ-13 

 LTS HWQ-5: Reclamation will monitor surface and groundwa

quality prior to, during, and after jet grouting or excavatioMIAD. 

Excess material placed in the reservoir would cause adverse water quality effects. 

HWQ-1, HWQ-2, HWQ-3, HWQ-9, HWQ-14 

 LTS HWQ-6: The Reclamation Construction Contractor will b

work should jet grout daylight more than 50 ft from the pountil it can be determined that the grout will remain locali

Dewatering the existing Stilling Basin could cause adverse water quality effects. 

HWQ-11 LTS HWQ-7: Reclamation will visually inspect all wetlands ne

could be impacted by construction for the presence of grevery 15 to 30 minutes.

HWQ-8: The Reclamation Construction Contractor will grout solidification areas with an impervious material thamigration of any construction-related wastes. 

2-38 Folsom DS/FDR Final EI
Table 2-2 

Folsom Dam Safety/Flood Damage Reduction EIS/EIR Impacts and Mitigation Measures 

Impact Being Mitigated 

Relevant 

Mitigation 

Measures 

Level of 

Significance 

With 

Mitigation3 List of Mitigation Measures for each R

HWQ-9: The Responsible Federal Agency will obtain guCVRWQCB for testing earthen materials before construcwithin or adjacent to the reservoir. This is to ensure that associated pollutants will not be introduced into the resewater quality standards or substantially degrade existing material will be placed in the reservoir during periods of lwhen possible. Best management practices will be adheminimize water quality impacts during the placement of fHWQ-11: The Corps will obtain a dewatering permit from implement applicable water quality monitoring during dewStilling Basin. HWQ-12: The Responsible Federal Agency will develop consultation with CVRWQCB staff to minimize water quameasures may include placement of a silt curtain surrounzone or construction of coffer dams. If appropriate, routicollected at the start and completion of each dredging anHWQ-13: During the process of dredging material to conchannel for the Auxiliary Spillway, sediment containing musing a variety of methods, including, but not limited to, swell as other BMPs and construction methods approved Dredged material will be placed on the downstream side contained area for drying and processing. The dredged contained either in the MIAD overlay or transported to a outside of the reservoir.HWQ-14: The Responsible Federal Agencies will develomonitoring plan for review by the CVRWQCB prior to any work. The plan will address sampling requirements durinexcavation, and placement of fill within the reservoir. If tuaction level values established by the CVRWQCB, correimplemented in accordance with the plan.

Folsom DS/FDR Final EIS/EIR – March 2007 
Chapter 2 

Project Description 

Table 2-2 

Folsom Dam Safety/Flood Damage Reduction EIS/EIR Impacts and Mitigation Measures 

Impact Being Mitigated 

Relevant 

Mitigation 

Measures 

Level of 

Significance 

With 

Mitigation3 List of Mitigation Measures for each R

Water Supply 

WS-1: The Responsible Federal Agencies working with tContractors will construct a temporary bypass using meascheduled disruption, using a bypass pipeline) that will nThese means will be discussed with CCAO and the CCACity of Folsom, and California Department of Corrections 

The relocation of a 300-ft segment of the Natomas Pipeline to an above ground pipeline would temporarily interrupt water supplies to the City of Folsom and California Department of Corrections water treatment plants. 

WS-1 LTS 

Air Quality Stationary Source Mitigation Options: The stationary sources associated with the Folsom DS/FDR would include the concrete batch plant(s) and material crushing/processing facilities. Because these plants would be subject to air quality permitting by one or more of the local air districts with assumed emissions reduction requirements. 

AQ-1, AQ2 LTS AQ-1: The Responsible Federal Agencies, including CCA

manager, will seek opportunities to tie facility power to thlieu of diesel-driven generators and pumps. Using grid pgaseous pollutants associated with diesel engines, as wematter which is a listed toxic air contaminant in California

Mobile Source Mitigation Options: Construction equipment emissions would exceed air quality standards. The standard CEQA mitigation measures for construction equipment emissions are provided in SMAQMD, 2004 

AQ-3, AQ4 LTS AQ-2: If deemed appropriate, the Responsible Federal A

with their Construction Contractors will institute a wet supreduce plant dust emissions. For this analysis, the controon AP-42 controlled emission factors for batch plants and These controls are included as part of the Folsom DS/FDstationary plants. The emissions for these units will be refirmed up for air quality permitting and eventual operation

2-40 Folsom DS/FDR Final EI
Table 2-2 

Folsom Dam Safety/Flood Damage Reduction EIS/EIR Impacts and Mitigation Measures 

Impact Being Mitigated 

Relevant 

Mitigation 

Measures 

Level of 

Significance 

With 

Mitigation3 List of Mitigation Measures for each R

NOx Mitigation Options: Construction equipment emissions would exceed air quality standards. Several mitigation options that may be applicable to mobile construction equipment engines to reduce NOx emissions are described below. The specific measures to be employed will be based on discussions with the SMAQMD. 

AQ-5, AQ6, AQ-7 LTS AQ-3: The Responsible Federal Agencies (working with 

Contractors as appropriate) will provide a plan for approvdemonstrating that the heavy-duty (> 50 horsepower) offin the construction project, including owned, leased and will achieve a project wide fleet-average 20 percent NOx percent particulate reduction compared to the most recetime of construction 

PM 10 Mitigation Options: Construction activities, materials processing, and materials hauling will produce fugitive dust above air quality standards 

AQ-8 LTS AQ-4: The Responsible Federal Agency working with the

Contractor will submit to the SMAQMD a comprehensive construction equipment, equal to or greater than 50 horsan aggregate of 40 or more hours during any portion of tThe inventory shall include the horsepower rating, engine projected hours of use or fuel throughput for each piece inventory shall be updated and submitted monthly througproject, except that an inventory shall not be required for which no construction activity occurs. At least 48 hours pheavy-duty off-road equipment, the project representativand the CCAO area manager with the anticipated constrstart date, and name and phone number of the project mforeman.AQ-5: The responsible Federal Agency in conjunction wContractors will evaluate the potential use of emulsified ocould theoretically be applied to all diesel equipment opeevaluation would be making a decision whether this woupurchased for the Folsom DS/FDR action. It is anticipatewould occur onsite with a fuel depot and/or mobile fuelinthat aqueous diesel fuel would provide a 14 percent reduwell as a 63 percent reduction of engine exhaust PM10 ethe control efficiencies incorporated in the URBEMIS200

Folsom DS/FDR Final EIS/EIR – March 2007 
Chapter 2 

Project Description 

Table 2-2 

Folsom Dam Safety/Flood Damage Reduction EIS/EIR Impacts and Mitigation Measures 

Impact Being Mitigated 

Relevant 

Mitigation 

Measures 

Level of 

Significance 

With 

Mitigation3 List of Mitigation Measures for each R

AQ-6: The responsible Federal Agency working with theContractors will evaluate the use of equipment with enginexhaust gas recirculation (EGR) systems. EGR systems the engine design for a substantial portion of the existing fleet in the region to be effective. While EGR systems caNOx, PM10, CO, and VOC emissions, it is not likely that construction equipment have EGR engines to provide anFolsom DS/FDR action. However, the availability of consEGR systems will need to be reviewed in detail prior to thincorporate or drop this option from the MMRP for the prAQ-7: The responsible Federal Agency working with theContractors will evaluate the installation of a lean NOx caexhaust system. Lean NOx catalyst filters may be availaequipment exhaust. However, these units would need to before being installed on specific construction equipmenother add-in exhaust filters are not compatible with aqueTherefore, aqueous fuel use and lean NOx catalysts may mitigation options. Again, a detailed review of applicable compatibility with different fuels will need to be conductecan be made to incorporate in or drop this option from thAQ-8: The responsible Federal Agency working with theContractors will apply fugitive dust control to reduce PM1Typical dust mitigation measures include:

• Wet suppression and soil stabilization • Wind fencing around active area • Paving on-site roadways • Truck wheel washing facilities at site exits onto public r

• Maintaining minimum truck bed freeboard or covering h

Terrestrial Vegetation and Wildlife 

2-42 Folsom DS/FDR Final EI
Table 2-2 

Folsom Dam Safety/Flood Damage Reduction EIS/EIR Impacts and Mitigation Measures 

Impact Being Mitigated 

Relevant 

Mitigation 

Measures 

Level of 

Significance 

With 

Mitigation3 List of Mitigation Measures for each R

Construction may have direct or indirect impacts to special-status plant species. 

BIO-1, BIO-2, BIO-3, BIO-4, BIO-5, BIO-7, BIO-11 

 LTS BIO-1: A biologist qualified for the respective survey will 

surveys within the project footprint in areas that may conspecial-status plant, invertebrate, or wildlife species. Thlocations of special status plant, invertebrate, or wildlife snecessary measures to provide protection.

There would be direct or indirect impacts to protected oak woodlands. 

BIO-1, BIO-2, BIO-4, BIO-7, VEG-1 

 LTS BIO-2: To the extent consistent with project implementat

Responsible Federal Agencies working with their respecContractors will avoid any populations of special-status pwildlife species by placing fencing around the population area. Environmental monitors employed either by the ReAgency or their Construction Contractor will regularly insbiological resources to ensure no disturbance.

There could be direct or indirect impacts (death, harassment, disturbance, noise) to special-status wildlife species, including amphibians, reptiles, birds, and mammals, or their habitat due to temporary or permanent alteration of terrestrial habitat through construction, development of borrow sites, and placement of fill. 

BIO-1, BIO-2, BIO-3, BIO-4, BIO-5, BIO-7, BIO-9, BIO-11, AMP-1 

 LTS BIO-3: The responsible Federal Agency will consult with 

should populations of special-status plant, invertebrate, ofound that cannot be avoided; special mitigation measuredeveloped for those populations.

Borrow site excavation and other construction activities could result in sedimentation in streams, creeks and seasonal wetlands. 

BIO-6, BIO-7 

 LTS BIO-4: All construction personnel at the Folsom DS/FDR 

receive environmental awareness training from Responsbiologist(s) associated with the project, or suitably trained regarding the potential presence of listed, special-status, trees) species in the project area and the importance of aspecies and/or habitats and reporting sightings.

Folsom DS/FDR Final EIS/EIR – March 2007 
Chapter 2 

Project Description 

Table 2-2 

Folsom Dam Safety/Flood Damage Reduction EIS/EIR Impacts and Mitigation Measures 

Impact Being Mitigated 

Relevant 

Mitigation 

Measures 

Level of 

Significance 

With 

Mitigation3 List of Mitigation Measures for each R

Borrow site excavation and other construction activities could result in direct mortality to nesting birds protected by the Migratory Bird Treaty Act. 

BIO-11 WIL-1, BRD-1, BRD-2 

 LTS BIO-5: The responsible Federal Agencies will develop a 

address potential losses to all habitats impacted within thRevegetation Plan will be implemented immediately folloaccordance with requirements in the SWPP, FWCAR, anand Reporting Plan (MMRP).

Adverse effects to wildlife could result from underwater blasting. 

BIO-1, BIO-2, BIO-3, BIO-4, BIO-5, BIO-11 

 LTS BIO-6: The Construction Contractor will be required to im

erosion and sedimentation control measures (BMPs), as measures HWQ-1 through HWQ-3, for all grading, filling, excavating that occurs as part of site and haul road cons

There would be loss of native vegetation. VEG-1 to 

VEG-3, VEG-5, VEG-6, BIO-10 

 LTS BIO-7: The Construction Contractor will be required to m

vegetation, wetlands, and breeding wildlife. Unpaved acfrequently watered with raw water using a sprayer truck dtrucks and other construction vehicles are using the roadwhen precipitation has dampened the soil enough to inhion unpaved roads in the construction footprint would be dust.

There would be permanent loss of wetlands and other waters of the U.S. 

VEG-4, VEG-6, VEG-7, BIO-10 

 LTS BIO-9: The responsible Federal Agency or their respecti

Contractor will employ qualified biologists (monitors) throperiod to identify any at-risk special-status species. The the appropriate agency to remove individuals from the prUSFWS and CDFG laws, handling guidelines, licenses, a

There would be temporary disturbance of wetlands and other waters of the U.S. 

VEG-4, VEG-6, VEG-7, BIO-10 

 LTS BIO-10: Reclamation will follow recommendations in the 

mitigation in the FWCAR for all affected habitats. Followincremental analysis, the Corps will develop and coordinmitigation with USFWS, and ensure mitigation will be imphabitats.

2-44 Folsom DS/FDR Final EI
Table 2-2 

Folsom Dam Safety/Flood Damage Reduction EIS/EIR Impacts and Mitigation Measures 

Impact Being Mitigated 

Relevant 

Mitigation 

Measures 

Level of 

Significance 

With 

Mitigation3 List of Mitigation Measures for each R

BIO-11: To minimize adverse effects to federally listed sthe responsible Federal agency shall implement avoidanmeasures from the project Biological Assessment and anOpinion from the USFWS. These measures will supplemnecessary, other project mitigation measures.

Construction activities and borrow site excavation may result in adverse effects to host plants for the valley elderberry longhorn beetle. 

BIO-11, INV-1a, INV-1b, INV-1c, INV-1d, INV-1e 

 LTS 

WIL-1: To the extent possible, the responsible Federal Arespective Construction Contractor to initiate excavation activities during non-breeding seasons for special-status Habitat for special status and protected species will be rebreeding season if practicable to preclude return to the pspecies during construction activities. BRD-1: To the extent possible, the responsible Federal Arespective Construction Contractor to remove vegetation breeding habitat in the Folsom DS/FDR project area betwFebruary 28, when birds are not expected to be nesting worder to comply with the Migratory Bird Treaty Act (MBTAImpacts to non-breeding birds still may occur between S28, because they are not reproductively constricted to thperiod. During the period from March 1 to August 31, bird occurring and therefore the potential for impacts to nestin

Folsom DS/FDR Final EIS/EIR – March 2007 
Chapter 2 

Project Description 

Table 2-2 

Folsom Dam Safety/Flood Damage Reduction EIS/EIR Impacts and Mitigation Measures 

Impact Being Mitigated 

Relevant 

Mitigation 

Measures 

Level of 

Significance 

With 

Mitigation3 List of Mitigation Measures for each R

BRD-2: The responsible Federal Agency will be required implement a bird monitoring plan as part of the MMRP to construction-related impacts to birds during the breeding with the MBTA and Executive Order 13186. Mitigation wlimited to a nest monitoring zone of an adequate size to reduce impacts to breeding birds at active construction seither deter nesting or acclimate birds to construction noemployed. One potential method would be the use of aco500 ft of blasting sites to deter birds from nesting near blthem to become habituated to the noise. Also, an appropactive nests of special status bird species will be implemwill be conducted by a biologist qualified and experienceAMP-1: The Construction Contractor will be required to gexcavated areas within the proposed borrow sites to prevartificial pools by amphibian species as well as prevent fchanging reservoir water surface elevations.VEG-1: Reclamation will be required to compensate for nwoodlands impacted by construction at the ratio stipulateMMRP. Following the Corps’ incremental analysis, the Ccoordinate project-related mitigation with USFWS, and eimplemented for all affected habitats.VEG-2: Reclamation will be required to compensate for rimpacted by construction at the ratio stipulated in the FWFollowing the Corps’ incremental analysis, the Corps will project-related mitigation with USFWS, and ensure mitigfor all affected habitats.

VEG-3: Reclamation will be required to compensate for cimpacted by construction at the ratio stipulated in the FWFollowing the Corps’ incremental analysis, the Corps will project-related mitigation with USFWS, and ensure mitigfor all affected habitats.

2-46 Folsom DS/FDR Final EI
Table 2-2 

Folsom Dam Safety/Flood Damage Reduction EIS/EIR Impacts and Mitigation Measures 

Impact Being Mitigated 

Relevant 

Mitigation 

Measures 

Level of 

Significance 

With 

Mitigation3 List of Mitigation Measures for each R

VEG-4: Reclamation will be required to compensate for wconstruction at the ratio stipulated in the FWCAR and MMCorps’ incremental analysis, the Corps will develop and mitigation with USFWS, and ensure mitigation will be imphabitats.VEG-5: For appropriate phases of work, prior to bringing sites, Construction Contractors will clean all mud, soil, anfrom the equipment. This will help prevent the importatiothat are exotic, non-native, or invasive.VEG-6: The responsible Federal Agency will ensure that disturbed areas will be monitored for invasive non-native particularly French broom and pampas grass, for three to completion of construction, with the assistance of a qualispecies are becoming established on areas disturbed by the three to five year period, invasive species will be rempreclude the plants from setting new seed.VEG-7: During jet grouting of the foundation at MIAD, Reresponsible to delineate wetlands downstream of MIAD uequipment will be staged within 25 ft of a wetland, nor wi25 ft of a wetland.

INV-1a: Where avoidance is compatible with the constru

DS/FDR Action, the responsible Federal Agency working construction contractor will establish and maintain a 100elderberry plants containing stems measuring 1.0 inches ground level. USFWS will be consulted before any disturarea occur.

Folsom DS/FDR Final EIS/EIR – March 2007 
Chapter 2 

Project Description 

Table 2-2 

Folsom Dam Safety/Flood Damage Reduction EIS/EIR Impacts and Mitigation Measures 

Impact Being Mitigated 

Relevant 

Mitigation 

Measures 

Level of 

Significance 

With 

Mitigation3 List of Mitigation Measures for each R

INV-1b: The responsible Federal Agency will transplant ecannot be avoided during Folsom DS/FDR construction tapproved by USFWS. All elderberry plants containing steinches or greater in diameter at ground level will be transconservation area if technically feasible, per project Biolowas submitted to USFWS and Biological Opinion that is as well as the Valley Elderberry Longhorn Beetle (VELB) (USFWS 1999).INV-1c: The responsible Federal Agency will compensatstem measuring 1.0 inch or greater in diameter at ground affected during Folsom DS/FDR construction with elderbassociated native plant seedlings in the conservation areOpinion for the Project and USFWS’s 1999 VELB Conseminimum survival rate of at least 60 percent of the elderbmaintained throughout the monitoring period (see INV-1ethis level, additional seedlings or cuttings will be planted. be obtained from local sources.INV-1d: The responsible Federal Agency will be responsplants associated with elderberry plants at the Folsom Dsimilar reference sites, at ratios provided in the BiologicaA minimum survival rate of at least 60 percent of the assmust be maintained throughout the monitoring period (sedrops below this level, additional seedlings or cuttings wfrom local sources will be used.INV-1e: The responsible Federal Agency will establish a distinct from the project area that will be protected in percompensation site for transplanted elderberry plants and vegetation. This area will provide at least 1,800 square fe

elderberry plant. The condition of the valley elderberry loshrubs, and general condition of the conservation area wperiod of ten consecutive years or for seven years over a occurring on the first, second, third, fourth, fifth, seventh, years.

2-48 Folsom DS/FDR Final EI
Table 2-2 

Folsom Dam Safety/Flood Damage Reduction EIS/EIR Impacts and Mitigation Measures 

Impact Being Mitigated 

Relevant 

Mitigation 

Measures 

Level of 

Significance 

With 

Mitigation3 List of Mitigation Measures for each R

Aquatic Biota Construction activities may result in alteration of habitat for protected vernal pool invertebrates or direct impacts to these species. 

BIO-4, BIO-11, AQINV1a, AQINV1b, AQINV-1d 

 LTS AQINV-1a: The responsible Federal Agency will complet

special-status branchiopods prior to any grading or other potential habitat for these species. 

Jet grouting may have direct or indirect impacts to adjacent wetland ecosystems 

AQINV-4 LTS AQINV-1b: The responsible Federal Agency working wit

Construction Contractor will avoid (preserve) potential veplacing fencing and a suitable buffer area around the vereffects from vehicle compaction and other construction-rvernal pool habitat that is to be avoided, an approved bioinspect construction-related activities to ensure that no udestruction of habitat occurs. The biologist will contact threpresentative who has the authority to stop activities thaor destruction until corrective measures have been takenbe required to report immediately any unauthorized effecCorps, and to the USFWS and CDFG. 

Dewatering the existing Stilling Basin would displace and potentially harm fish. 

FISH-1 LTS AQINV-1d: Adverse impacts to potential vernal pool hab

DS/FDR footprint will be compensated in a manner agreresponsible Federal Agency and the USFWS. For exampdirectly or indirectly affected, vernal pool credits will be dUSFWS-approved ecosystem preservation bank. Based of conservation values of the affected habitat, vernal poopreserved, or created and monitored, on the Folsom DS/non-bank site approved by the USFWS. Vernal pool habupland habitat used as on-site mitigation will be protecteand managed in perpetuity or until the responsible Federagree on a process to exchange such areas for credits wmitigation banking system. 

Folsom DS/FDR Final EIS/EIR – March 2007 
Chapter 2 

Project Description 

Table 2-2 

Folsom Dam Safety/Flood Damage Reduction EIS/EIR Impacts and Mitigation Measures 

Impact Being Mitigated 

Relevant 

Mitigation 

Measures 

Level of 

Significance 

With 

Mitigation3 List of Mitigation Measures for each R

AQINV-4: To monitor the health of the wetlands downstr

at MIAD, Reclamation will conduct bioassessment studieafter jet grouting of the MIAD foundation.

FISH-1: The responsible Federal Agency will develop a fdewatering the existing Stilling Basin and implement the dewatering. 

Soils, Minerals, and Geological Resources 

GR-1: In order to obtain air quality permits from both SacCounties, the responsible Federal Agency will prepare a characterization report (signed by a California Registered approved Dust Mitigation Plan. The geologic site charactuseful for mitigation purposes by identifying areas of natuThe Dust Mitigation Plan will specify the activities and BePractices (BMPs) required to minimize airborne naturallyThese activities and BMPs are specified in the Airborne Tregulation as well as the more restrictive county requiremare not limited to, the following: 

• Pre-wet work area and keep area sufficiently wet during An approved palliative material may also be used to seaparent material; 

• Limit vehicle access and speed on serpentine and otheasbestos; • Cover areas that are exposed to vehicle travel; 

Construction activities near D1/D2, MIAD, and Dike 8 could result in effects associated with asbestos disturbance. 

GR-1 LTS 

• Material transfers and stockpiles of loose material must adequately wet, or sealed by an approved palliative; and

2-50 Folsom DS/FDR Final EI
Table 2-2 

Folsom Dam Safety/Flood Damage Reduction EIS/EIR Impacts and Mitigation Measures 

Impact Being Mitigated 

Relevant 

Mitigation 

Measures 

Level of 

Significance 

With 

Mitigation3 List of Mitigation Measures for each R

• Worker safety precautions and monitoring should be coemployee notifications should be provided, notifying emphealth risk and requirements of the asbestos dust mitigatCounty 2003). GR-2: Prior to construction activity, the responsible Fedetheir Construction Contractor will file a Notice of Intent windicate the intent to comply with the State General PermDischarges Associated with Construction Activity (GenerPermit establishes conditions to minimize sediment and requires preparation and implementation of a SWPPP pr

Section 3.1 for more details). The purpose of this Plan is of construction pollutants (in contact with storm water) inaccomplished through the selection of BMPs which are mto control erosion and sediment transport. The SWPPP lused and identifies the placement of the BMPs (State WBoard 2006). BMPs will be used during the construction in affected areas (e.g., Auxiliary Spillway and borrow and will be reestablished as well. 

Construction activities would increase the potential for soil erosion. 

GR-2 LTS 

Visual Resources Construction would introduce color and form changes to the landscape 

Note: visual resource impacts during construction are norestoration of disturbed areas following construction will impacts due to construction. 

VIS-3: To lessen the visual impacts of the concrete coloring agent will be added to the concrete to help natural surroundings. 

Construction of the parapet wall would introduce a color change to the top of existing dikes and dams. 

VIS -3 LTS 

Agricultural Resources N/A Note: there are no agricultural resources within the footp

DS/FDR actions. 

Folsom DS/FDR Final EIS/EIR – March 2007 
Chapter 2 

Project Description 

Table 2-2 

Folsom Dam Safety/Flood Damage Reduction EIS/EIR Impacts and Mitigation Measures

Impact Being Mitigated 

Relevant 

Mitigation 

Measures 

Level of 

Significance 

With 

Mitigation5 List of Mitigation Measures for each R

Transportation and Traffic 

T-1: In conjunction with the development and review of mdesign and construction specifications, the responsible FCCAO and CCAO area manager, will prepare a peak hospecific intersections to evaluate the need for changes to phasing modification, provision of additional turn lanes thphysical improvements, as necessary and appropriate to impacts to an acceptable level. In conjunction with that aneed for roadway improvements or operation modificatiorestrictions on turning movements, on-street parking, etccapacity in light of additional traffic from the project will bcompletion of these evaluations and the identification of improvement measures, as deemed necessary and apprtemporary nature of impacts, will be coordinated with the departments of the affected jurisdictions. 

Project alternative would result in traffic impacts including LOS deterioration, an ADT Increase >2%, and LOS F V/C Increase >0.05. 

T-1, T-2, T-3 

 LTS 

T-2: The responsible Federal Agency, including CCAO aworking with their respective Construction Contractor wilmanagement plan, outlining proposed routes to be approlocal entity, and implement it. High collision intersections avoided if possible. Drivers will be informed and trained haul routes, and areas that are more sensitive (e.g., high education centers, or narrow roadways). To the extent pbe restricted to non-commute hours. 

T-3: The responsible Federal Agency, including CCAO aworking with their respective Construction Contractor wilappropriate signage to inform the general public of the h

5 LTS = Less than significant with mitigation. 6 Unless otherwise specified, for mitigation measures that refer to “responsible Federal agency”, the Corps is responsible for impac

mitigation related to flood damage reduction construction activities; for all other construction-related project impacts and correspoReclamation is the responsible Federal agency. 

2-52 Folsom DS/FDR Final EI
Table 2-2 

Folsom Dam Safety/Flood Damage Reduction EIS/EIR Impacts and Mitigation Measures

changes, if applicable.

Noise 

N-1: The responsible Federal Agency will incorporate the sound attenuation on equipment or near facilities that wilsensitive receptors to comply with local noise ordinancesattenuation measures that could be considered include, temporary sound barriers near the noise source, such as impacts analysis relative to BACT for stationary/quasi-staotherwise placed between the source(s) of construction nreceptors, as appropriate.

The following measures will be incorporated into a Noise Control Plan to address increased night time noise levels as a result of the Folsom DS/FDR activities. 

N1, N2, N3, N4, N5, N6, N7, N8, N9, N10 

 LTS 

N-2: The Construction Contractor will be responsible for comply with noise standards (e.g., exhaust mufflers, acoshields, shrouds, or enclosures).N-3: If necessary to meet local noise ordinances, the Cobe required to enclose above-ground conveyor systems enclosures.N-4: If necessary to meet local noise ordinances, the Cobe required to line or cover hoppers, conveyor transfer pchutes with sound-deadening material. N-5: When necessary to comply with nighttime noise levContractor will be required to schedule truck loading, unloperations so as to reduce nighttime noise impacts to lesN-6: For nighttime or after-hour construction, the Construobtain a permit from the City and County, as appropriateN-7: The responsible Federal Agency will schedule blastand will adhere to restrictions on blasting as stated per Rsafety regulations. N-8: Monitoring blasting vibration will be implemented as Corps safety guidelines.

N-9: The Construction Contractor will be directed to use mats to cover blasts in order to minimize the possibility o

Folsom DS/FDR Final EIS/EIR – March 2007 
Chapter 2 

Project Description 

Table 2-2 

Folsom Dam Safety/Flood Damage Reduction EIS/EIR Impacts and Mitigation Measures

N-10: The responsible Federal Agency along with their rContractor will examine any properties, structures and cocomplaints of damages have been filed will be performed rock excavation and blasting work.

Cultural Resources 

CR-1: Identification, Evaluation and Mitigation (TreatmenProperties and/or Historical Resources.

All cultural resources located within the Area of Potentia

evaluated for inclusion in the National Registry of HistoriCRHR using criteria found at 36 CFR Part 800.4 or CRHmemorandum of agreement or a programmatic agreemeconsultation with SHPO and consulting parties, to mitigaidentified historic properties or historic resources. The imagreement document will reduce impacts to historic propresources to less than significant levels, per NEPA and Cthat are determined to be not eligible for inclusion in the require no further management. It should be noted that may not meet NRHP eligibility criteria, but still may be Cbe managed per CEQA but not per NEPA. 

If human remains are discovered, procedures outlined in and Standards for the Inadvertent Discovery of Human Rbe followed. 

Construction would lead to adverse effects to historic properties and/or historical resources. 

CR-1 LTS

The standard contract specifications contain directions to event of the discovery of other cultural resources during 

this project. Any such discovery will also be considered uCFR Part 800.13. 

Construction would lead to adverse effects to previously unknown historic properties and/or historical resources. 

CR-1 LTS

2-54 Folsom DS/FDR Final EI
Table 2-2 

Folsom Dam Safety/Flood Damage Reduction EIS/EIR Impacts and Mitigation Measures

Construction would lead to adverse effects upon previously undiscovered and potential historic properties and/or historical resources within the area of the increased reservoir elevation, and locations of new embankment, or footprints of construction work at existing Folsom Facilities. 

CR-1 LTS 

Land Use N/A There will be no changes to land use under the Preferred 

Folsom DS/FDR actions. 

Recreation 

RC-1: All construction-related damages to recreation fackind by the appropriate Federal Agency, in accordance wpolicies and guidance.

Construction could result in occasional temporary loss of recreational use at Folsom Point. 

RC-1 through RC-8 

 LTS 

Construction traffic could result in periodic interruptions to recreation at Beal’s Point. 

 RC-1 through RC-8 

LTS 

Construction could result in lost recreational use on trails at Beal’s Point. 

RC-9, RC10 LTS 

Construction could result in cancellation of special events scheduled at FLSRA. 

RC-7 LTS 

Installation and operation of security measures could interrupt recreation at FLSRA facilities. 

RC-6, RC9, RC-10 LTS 

 Construction could result in lost recreation on the Folsom Point-Browns Ravine Trail. 

Temporary, 

Significant and Unavoidable 

RC-2: The responsible Federal Agency will post signage announcements to inform the public of construction activFolsom Point or Beal’s Point, and provide instructions as access to FLSRA will be possible. The selected alternatiseparation at Folsom Point. Traffic will be separated eithcreates a grade separation or via a controlled, secured inperson or other engineered mechanism. In any case, thcontinuous access to Folsom Point during the constructioaccess entrances at Beal’s Point will be reconstructed to construction traffic and public access. This will significanon the recreation facilities.RC-3: Construction, borrow and staging areas will be siterecreation areas as practical in order to minimize recreatdetermined by the responsible Federal Agency. When a moved or relocated, appropriate measures would be takeconsiderations.

Folsom DS/FDR Final EIS/EIR – March 2007 
Chapter 2 

Project Description 

Table 2-2 

Folsom Dam Safety/Flood Damage Reduction EIS/EIR Impacts and Mitigation Measures

RC-4: The responsible Federal Agency will ensure that sdevelopment, staging and construction activities will be rconstructing agency, as appropriate, to pre-construction which do not pose a safety hazard. RC-5: After all construction activities are complete at Be

or Granite Bay, the responsible Federal Agency will ensurecreation areas and facilities will be restored as closely construction conditions. 

RC-6: The responsible Federal Agency will include in the specifications, as appropriate, details necessary to ensustations at Folsom Point and Beal’s Point will meet public requirements during construction. RC-7: The Responsible Federal Agencies including CCAManager will ensure that construction activities will be scimpacts during peak recreation use periods, holidays, anallow public access to the extent practical. RC-8: The Responsible Federal Agencies including CCAmanager will develop a traffic management plan for all pwithin the recreation areas where both public and constrplan would include measures such as flagmen and approtraffic plan would be submitted to the appropriate entitiesand Specifications for construction. An appropriate mile pwould be imposed in all public areas close to constructioand traffic will utilize internal haul routes, to the extent prRC-9: The responsible Federal Agency working with CalParks and Recreation (DPR) will identify suitable detourssignage, for any bike, equestrian, or pedestrian trails thaconstruction, per agency guidance and policy. Public serwould also be distributed and posted to inform the public Where possible to ensure public safety, the recreational truck traffic will be relocated to allow the trails to stay ope

2-56 Folsom DS/FDR Final EI
Table 2-2 

Folsom Dam Safety/Flood Damage Reduction EIS/EIR Impacts and Mitigation Measures

RC-10: Any damage to existing improved trails from conin kind after construction is completed by the responsible agency policy and guidance. 

Public Utilities Construction activities could require the relocation of electricity infrastructure. 

PSU-1 LTS PSU-1: The responsible Federal Agency, including CCA

manager, working with their respective Construction Conwith utility companies and other relevant agencies before existing utilities and avoid damage. Avoid the relocation possible. Provide notification of any potential interruptionappropriate agencies. 

Electricity would be required to power processing and concrete batch plants. 

PSU-2 LTS PSU-2: The responsible Federal Agency, including CCA

manager, working with their respective Construction Conutility will stage utility relocations to minimize interruption

Construction activities could require the relocation of existing water and wastewater infrastructure. 

PSU-1 LTS PSU-3: The Construction Contractor will be instructed to 

landfills to select licensed landfills with adequate capacit

Construction activities would generate solid waste. 

PSU-3, PSU-4, PSU-5 

 LTS PSU-4: The Construction Contractor will be instructed to 

wastes whenever possible.

Construction activities could increase emergency response times to the Folsom Facility. 

PSU-6 LTS PSU-5: The Construction Contractor will be directed to d

wastes at licensed hazardous waste facilities.

 Construction activities could require the relocation of telecommunication infrastructure. 

PSU-1, PSU-2 

 LTS PSU-6: Prior to construction, the responsible Federal Ag

its respective Construction Contractor will consult with loand CCAO area manager, and DPR staff to develop and response plans and establish emergency vehicle routes.

Hydropower N/A The Folsom DS/FDR actions will not change current powPopulation & Housing N/A The Folsom DS/FDR actions will not require new housinEnvironmental Justice 

Folsom DS/FDR Final EIS/EIR – March 2007 
pter 2 

ct Description 

Folsom DS/FDR Final EI

Table 2-2 

Folsom Dam Safety/Flood Damage Reduction EIS/EIR Impacts and Mitigation Measures

N/A The Folsom DS/FDR actions will have no significant env

impacts. 

Public Health & Safety 

PHS-1: A public safety management plan will be prepareFederal Agency and implemented to maintain public safeconstruction. Components of the plan will address: • Public notification of the location and duration of constr

pedestrian/bicycle path/trail closures, and restrictions on boating, water skiing, fishing, swimming); 

• Verification with local jurisdictions that construction blocroadways will not interfere with existing emergency evac• Adequate signage regarding the location of constructiothe presence of construction equipment; • Fencing of construction staging areas and of constructiconditions exist when construction is not occurring; and 

Construction activities could increase hazards by the placement of construction equipment in waterways, roadways, or other areas potentially accessible by park visitors. 

PHS-1 LTS 

• Temporary walkways (with appropriate markings, barrieseparate pedestrians from vehicular traffic) and detour ssidewalk or pedestrian/bicycle path/trail will be closed du

Construction would increase the risk of fire. 

PHS-2 LTS PHS-2: Prior to initiating construction activities, the respo

in consultation with CCAO and CCAO area manager and county and State fire suppression agencies will prepare Management Plan. The plan will include fire prevention aincluding fire precaution, pre-suppression, and suppresswith the policies and standards in the affected jurisdictionPHS-3: The responsible Federal Agency will conduct a PSite Assessment (ENSA) at all former construction sites construction. As necessary, a soil characterization progrimplemented at all excavation locations in proximity to lissites identified in the Phase I ENSA. The soil characterizidentify those excavation areas that will require developmof appropriate remediation measures. Mitigation Measurapplies only to areas where contact with contaminated ssuspected. 

ChaProje2-58

Construction work at sites used to construct the original Folsom Facility may expose workers to health and safety effects from chemical materials buried at those sites. 

PHS-3, PHS-4, PHS-5 

 LTS

Construction work could expose workers PHS-4, LTS PHS-4: The Responsible Federal Agencies will prepare 
Folsom DS/FDR Final EIS/EIR – March 2007 

Table 2-2 

Folsom Dam Safety/Flood Damage Reduction EIS/EIR Impacts and Mitigation Measures

Health and Safety Plan prior to the start of construction awill prepare a Health and Safety Plan that should, at a m• all contaminants that could be encountered during excapotential for asbestos, TPH in soil) ; • all appropriate worker, public health, and environmentaand procedures; • emergency response procedures; • most direct route to a hospital; and • Site Safety Officer. The plan will require documentation that all workers have the plan.

to hazardous materials used during construction 

PHS-5 

PHS-5: Prior to initiation of construction activities, the Cobe required to prepare a Hazardous Material Managemeresponsible Federal Agency. The purpose of this plan is plan of action if hazardous materials are encountered duestablish best management practices (BMPs) to reduce to hazardous wastes. The plan will: • define a protocol for proper handling and disposal of haare encountered during construction, • define a protocol for proper emergency procedures and hazardous materials if an accidental spill occurs during c• establish BMPs to reduce the potential for spills of HTRTypical BMPs to reduce the potential for spills may includ

• having a spill prevention and control plan with a designoversee and enforce proper spill prevention measures; • providing spill response and prevention education for esubcontractors; • stocking appropriate clean-up materials onsite near maand use areas; • designating hazardous waste storage areas away from watercourses;• minimizing production or generation of hazardous matesubstituting chemicals used onsite with less hazardous c• designating areas for construction vehicle and equipmefueling with appropriate control measures for run-on and • arranging for regular hazardous waste removal to minim
pter 2 

ct Description 

Folsom DS/FDR Final EI

Table 2-2 

Folsom Dam Safety/Flood Damage Reduction EIS/EIR Impacts and Mitigation Measures

ChaProje2-60

Indian Trust Assets There are no Indian Trust Assets within the Folsom DS/FDR project footprint.