FIO-LSAR_R9P5B_DDR_Geotech_Appendix_Attachments_F-Q.pdf

Attachment F

Development of Design Shear Strength Parameters

COMPUTATION SHEET

PROJECT LSAR Reach 9 Phase 5B SHEET NO. 1 OF 1 SHEETS

ITEM Unit Weight Determination DATE 10-28-15 _

FILE ___________________________

COMPUTED BY DT CHECKED BY REF. DRWG. NO. ________________

Based on the soil phase relationships, the following two equations will be utilized to determine the dry and saturated unit weights.

𝑤 = 𝑆 × �𝛾𝑤 𝛾𝐷 − 1

𝐺 � (Equation 1) 𝛾𝑠𝑎𝑡 = (1+𝑤)×𝛾𝑤 𝑤+1𝐺

(Equation 2)

Where w = Water Content S = Saturation G = Specific Gravity 𝛾𝐷= Dry United Weight 𝛾𝑤= Unit Weight of Water 𝛾𝑠𝑎𝑡= Saturated Unit Weight

It is assumed 𝛾𝑤= 62.4 pounds per cubic foot (pcf), G = 2.65 (sands range from 2.63 to 2.67), initial saturation (S) of 80 percent, and 𝛾𝐷= 115 pcf. The resulting moisture content, w, and saturated unit weight, 𝛾𝑠𝑎𝑡, is 13.2 percent and 139 pcf respectively.

SC

PROJECT LSAR Reach 9 Phase 5B SHEET NO. 1 OF 3 SHEETS

ITEM Evaluation of Design Shear Strength Parameters DATE 05/07/15 ________

FILE _________________ ___

COMPUTED BY AR CHECKED BY REF. DRWG. NO. ___________

Estimation of the soil strength parameters for use in slope stability analysis were based on field explorations, laboratory testing (direct shear), published shear strength correlations, and engineering judgment. Field explorations included twenty-six (26) test holes from the 2014 subsurface exploration conducted by the U.S. Army Corps of Engineers. Using “raw” Standard Penetration Test (SPT) blow counts (standard penetration resistance) and calculated vertical effective overburden stress, a relative density can be estimated from "Correlations Between Relative Density and Standard Penetrations Resistance" published in the NAVFAC Soil Mechanics Design Manual, DM 7.01 (Figure 3, pg. 7.1-87).

With a known soil classification and relative density, the effective angle of internal friction Φ' (degrees) can be estimated using the "Correlations of Strength Characteristics for Granular Soils" also published in DM 7.01 (Figure 7, pg 7.1-149). This approximate correlation is only appropriate for cohesionless materials without plastic fines. An example calculation is presented below.

Calculation Example:

Problem Statement - For test hole TH14-P5B-15, determine the effective angle of internal friction at a depth of 35 to 36.5 feet below ground surface (bgs). Groundwater was encountered at 19.4 feet bgs.

From the test hole log, the Standard Penetration Resistance (N, blows/foot) recorded at 35 to 36.5 feet bgs is 24 and the soil was classified as poorly graded sand with silt (SP-SM). Total unit weight of soil is assumed to be ~ 139 pcf. The vertical effective stress is calculated as follows:

Vertical Effective Stress

35 36.5

3.95

With the standard penetration resistance and vertical effective stress, go to NAVFAC DM 7.1 Figure 3 and estimate the relative density.

Using the relative density estimate of ~ 66% from the previous step and the SP-SM soil classification, go to NAVFAC DM 7.1 Figure 7 and estimate Φ'. In this example, Φ' was estimated at 34 degrees.

This procedure was used to evaluate all of the SPT data collected during the field explorations. Included in this calculation package are summary tables for each test hole presenting the data used to estimate the soil strength and the design value assigned to each stratigraphic unit.

Using the correlation between SPT values and relative density in Table 22-1 of the Engineering Geology Field Manual from the U.S. Department of the Interior Bureau of Reclamation’s and the developed geographic cross sections each SPT data point was assigned one of the design material types. The samples were sorted by material type to provide a range of strengths associated with each material. To be conservative and consistent with the Corps’ guidance, the design strength parameters used the 33 percentile strength value. Based on the direct shear results, a minimal amount of cohesion was assigned to the materials.

PROJECT LSAR Reach 9 Phase 5B SHEET NO. 2 OF 3 SHEETS

ITEM Evaluation of Design Shear Strength Parameters DATE 05/07/15 ________

FILE _________________ ___

COMPUTED BY AR CHECKED BY REF. DRWG. NO. ___________

NAVFAC DM 7.1 Figure 3: Correlations Between Relative Density and Standard Penetration Resistance.

Figure 2 – From NAVFAC DM 7.1, Correlations of Strength Characteristics for Granular Soils

~ 66 %

Φ’=34

PROJECT LSAR Reach 9 Phase 5B SHEET NO. 3 OF 3 SHEETS

ITEM Evaluation of Design Shear Strength Parameters DATE 05/07/15 ________

FILE _________________ ___

COMPUTED BY AR CHECKED BY REF. DRWG. NO. ___________

Below are the adopted design shear strengths for each stratigraphic unit.

Material Shear Strength Unit Weight

' (degrees) c' (psf) Ɣ’m (pcf) Ɣ’sat (pcf)

Artificial Fill 36 0 115 139

Sandy Silt/Silty Sand 34 400 100 130

Loose to Medium Dense Alluvium 33 25 110 135

Medium Dense to Dense Alluvium 34 25 115 139

Dense to Very Dense Alluvium 38 0 120 141

Fine Grained Older Alluvium (CL) 33 750 105 133

Sandstone Bedrock 40 400 123 143

Compacted Backfill 30 0 130 147

Grouted Stone 45 250 150 150

SHEAR STRENGTH CALCULATION BASED ON SPT BLOWCOUNT CORRELATION

LSAR Reach 9 Phase 5b David Tran Date: 11/19/2015

Lower Santa Ana River

Boring No. :

Top Bottom Top Bottom Relative

Density, %

Friction Angle

(degree) Cohesion (psf)

Friction Angle

(degree) Cohesion (psf) silty sand SM 39 317.2 5 6.5 355.5 354.0 well‐graded sand w/ silt & gravel SW‐SM 139 115 50 0.80 100 39 0 14 15.5 346.5 345.0 poorly graded sand SP 139 115 27 2.05 82.5 38 0 24 25.5 336.5 335.0 well‐graded sand w/ silt & gravel SW‐SM 139 115 24 3.39 68.9 35 0 poorly graded sand w/ silt SP‐SM 139 115 41 438.4 40 41.5 320.5 319.0 poorly graded sand w/ silt SP‐SM 139 115 5 4.62 16.6 28 0 50 50.4 310.5 310.0 poorly graded sand w/ silt SP‐SM 139 115 50/5" 5.34 100 39 0

Boring No. :

Top Bottom Top Bottom Relative

Density, %

Friction Angle

(degree) Cohesion (psf)

Friction Angle

(degree) Cohesion (psf)

5 6.5 360.3 358.8 silty sand SM 139 115 17 0.80 80.1 36 0 15 16.5 350.3 348.8 well‐graded sand w/ silt SW‐SM 139 115 16 2.19 64.4 34 0 poorly graded sand w/ silt SP‐SM 34 307.5 30 31.5 335.3 333.8 well‐graded sand w/ silt SW‐SM 139 115 29 4.05 71.3 35 0 40 41.5 325.3 323.8 well‐graded sand w/ silt & gravel SW‐SM 139 115 50/6" 4.81 100 42 0

45 46.5 320.3 318.8 silty sand w/ gravel SMg 139 115 58 5.20 88.4 37 0

Boring No. :

Top Bottom Top Bottom Relative

Density, %

Friction Angle

(degree) Cohesion (psf)

Friction Angle

(degree) Cohesion (psf)

10 11.5 344.4 342.9 well‐graded sand w/ silt & gravel SW‐SM 139 115 16 1.49 69.3 34 0

12 13.5 342.4 340.9 well‐graded sand w/ silt & gravel SW‐SM 139 115 11 1.77 54.6 33 0

15 16.5 339.4 337.9 well‐graded sand w/ silt & gravel SW‐SM 139 115 26 2.11 80.4 37 0

20 21.5 334.4 332.9 well‐graded sand w/ silt & gravel SW‐SM 139 115 27 2.49 78.7 36 0

22.5 24 331.9 330.4 well‐graded sand w/ silt & gravel SW‐SM 139 115 15 2.69 59.1 34 0

25 26.5 329.4 327.9 well‐graded sand w/ silt & gravel SW‐SM 139 115 35 2.88 84.9 37 0

30 31.5 324.4 322.9 well‐graded sand w/ silt SW‐SM 139 115 74 3.26 100.0 39 0

35 36.5 319.4 317.9 well‐graded sand w/ silt SW‐SM 139 115 36 3.64 80.0 37 0

40 41.5 314.4 312.9 well‐graded sand w/ silt SW‐SM 139 115 50/0" 4.03 100.0 42 0

SPT

used Po, ksf

Estimated

Elevation of Top Hole (ft): 365.33

Estimated From Lab, Ultimate Value

356.95

30 330.5

TH14‐P5B‐2 Groundwater Depth (ft):

From Lab, Ultimate Value

From Lab, Ultimate Value

27.1

Layer Depth (feet) Layer in Elevation

(ft, NGVD 29) Type of Soil USCS

Total Unit

Weight (pcf)

Dry Unit Weight

(pcf)

TH14‐P5B‐2A Groundwater Depth (ft): 14.5 Elevation of Top Hole (ft):

Layer Depth (feet) Layer in Elevation

(ft, NGVD 29) Type of Soil USCS

Total Unit

Weight (pcf)

Dry Unit Weight

(pcf)

SPT

used Po, ksf

Project Name:

Project Location:

360.45TH14‐P5B‐01 Groundwater Depth (ft): 24 Elevation of Top Hole (ft):

Calculated By:

Checked By:

3.5

354.37

Layer Depth (feet) Layer in Elevation

(ft, NGVD 29)

Type of Soil USCS Total Unit

Weight (pcf)

Dry Unit Weight

(pcf)

SPT

used Po, ksf

20 345.3

Estimated

Boring No. :

Top Bottom Top Bottom Relative

Density, %

Friction Angle

(degree) Cohesion (psf)

Friction Angle

(degree) Cohesion (psf) silty sand w/ gravel SMg 37 302.8

10 11.5 358.7 357.2 silty sand w/ gravel SMg 139 115 25 1.49 85.5 36 0 silty sand SM 39 0

20 21.5 348.7 347.2 poorly graded sand SP 139 115 19 2.88 65.1 36 0 30 31.5 338.7 337.2 poorly graded sand SP 139 115 24 4.06 65.7 36 0 35 36.5 333.7 332.2 well‐graded sand w/ silt SW‐SM 139 115 46 4.44 84.3 37 0 40 41.5 328.7 327.2 well‐graded sand w/ silt SW‐SM 139 115 74 4.82 99.5 39 0 45 46.5 323.7 322.2 silty sand w/ gravel SMg 139 115 11 5.21 41.8 31 0

Boring No. :

Top Bottom Top Bottom Relative

Density, %

Friction Angle

(degree) Cohesion (psf)

Friction Angle

(degree) Cohesion (psf) silty sand SM 36 0 15 16.5 342.1 340.6 well‐graded sand w/silt & gravel SW‐SM 139 115 27 2.08 82.2 37 0 20 21.5 337.1 335.6 well‐graded sand w/ silt & gravel SW‐SM 139 115 24 2.46 75.3 36 0 25 26.5 332.1 330.6 well‐graded gravel w/ silt & sand GW‐GM 139 115 70 2.85 100 43 0 30 31.5 327.1 325.6 well‐graded sand w/ silt SW‐SM 139 115 35 3.23 82.1 37 0 40 41.5 317.1 315.6 well‐graded sand w/ silt SW‐SM 139 115 46 4.00 87 38 0 45 46.5 312.1 310.6 poorly graded gravel w/ silt and sand GP‐GM 139 115 55 4.38 91 42 0 50 51.5 307.1 305.6 poorly graded gravel w/ silt and sand GP‐GM 139 115 60 4.76 92.1 42 0

Boring No. :

Top Bottom Top Bottom Relative

Density, %

Friction Angle

(degree) Cohesion (psf)

Friction Angle

(degree) Cohesion (psf)

5 6.5 365.92 364.42 silty sand SM 139 115 31 0.80 100 37 0 silty sand SM 36 0

20 21.5 350.92 349.42 poorly graded sand w/ gravel SPg 139 115 13 2.88 53.5 34 0 silty sand SM 36 180.5

30 31.5 340.92 339.42 poorly graded sand w/ silt& gravel SP‐SM 139 115 23 4.10 64.2 34 0

Boring No. :

Top Bottom Top Bottom Relative

Density, %

Friction Angle

(degree) Cohesion (psf)

Friction Angle

(degree) Cohesion (psf)

5 6.5 368.28 366.78 poorly graded sand w/ silt & gravel SP‐SM 139 115 37 0.80 100 37 0 15 16.5 358.28 356.78 sandy silt ML 139 115 7 2.19 40.8 30 0 sandy silt ML 33 405.3 25 26.5 348.28 346.78 well‐graded sand w/ gravel SWg 139 115 38 3.58 82.7 38 0 30 31.5 343.28 341.78 well‐graded sand w/ gravel SWg 139 115 39 4.27 79.2 38 0 35 36.5 338.28 336.78 sandy silt ML 139 115 23 4.67 61.5 32 0 silty sand SM 38 145 45 46.5 328.28 326.78 poorly graded sand w/ silt SP‐SM 139 115 21 5.44 56.8 33 0 48 49.5 325.28 323.78 poorly graded sand w/ silt SP‐SM 139 115 58 5.66 86.3 38 0

Po, ksf

Total Unit

Weight (pcf)

Dry Unit Weight

(pcf)

SPT

used

Type of Soil USCS Total Unit

Weight (pcf)

Dry Unit Weight

(pcf)

SPT

used

Type of Soil USCS

Estimated

TH14‐P5B‐05 30.94

Layer Depth (feet)

Layer Depth (feet)

TH14‐P5B‐04 Groundwater Depth (ft): 27.92 370.92

363.73

6 351.14

Po, ksf

Total Unit

Weight (pcf)

Dry Unit Weight

(pcf)

SPT

used

Layer Depth (feet) Layer in Elevation

(ft, NGVD 29) Type of Soil USCS

Total Unit

Weight (pcf)

21 352.28

332.28

Dry Unit Weight

(pcf)

373.28Elevation of Top Hole (ft):

Elevation of Top Hole (ft):

SPT

used Po, ksf

Estimated

357.14

From Lab, Ultimate Value

TH14‐P5B‐03 368.73

Layer Depth (feet)

Groundwater Depth (ft):

Estimated From Lab, Ultimate Value

USCS

Estimated From Lab, Ultimate Value

From Lab, Ultimate Value

Layer in Elevation

(ft, NGVD 29)

27.3

TH14‐P5B‐03A Groundwater Depth (ft): 14

15 353.7

Elevation of Top Hole (ft):

Groundwater Depth (ft): Elevation of Top Hole (ft):

Layer in Elevation

(ft, NGVD 29)

354.92

25.5 345.42

Layer in Elevation

(ft, NGVD 29) Type of Soil

Po, ksf

Top Bottom Top Bottom Relative

Density, %

Friction Angle

(degree) Cohesion (psf)

Friction Angle

(degree) Cohesion (psf)

5 6.5 348.89 347.39 poorly graded sand w/ silt & gravel SP‐SM 139 115 17 0.77 80.6 36 0 10 11.5 343.89 342.39 well‐graded gravel w/ silt & sand GW‐GM 139 115 28 1.15 94.6 44 0 15 16.5 338.89 337.39 well‐graded gravel w/ silt & sand GW‐GM 139 115 32 1.54 94.8 44 0 poorly graded sand w/ silt & gravel SP‐SM 44 0 poorly graded sand w/ silt & gravel SP‐SM 48 0

25 26.5 328.89 327.39 well‐graded sand w/ silt &gravel SW‐SM 139 115 13 2.30 57.2 33 0 30 31.5 323.89 322.39 poorly graded gravel w/ sand GP 139 115 48 2.69 98.5 42 0 35 36.5 318.89 317.39 poorly graded sand w/ silt & gravel SP‐SM 139 115 36 3.07 84.5 37 0 40 41.5 313.89 312.39 poorly graded sand w/ silt & gravel SP‐SM 139 115 57 3.45 98.8 39 0 45 45.2 308.89 308.72 poorly graded sand w/ silt & gravel SP‐SM 139 115 50/2" 3.78 100 39 50 51.5 303.89 302.39 poorly graded sand w/ silt & gravel SP‐SM 139 115 62 4.22 96.8 39 0

Boring No. :

Top Bottom Top Bottom Relative

Density, %

Friction Angle

(degree) Cohesion (psf)

Friction Angle

(degree) Cohesion (psf)

5 6.5 370.91 369.41 silty sand w/ gravel SMg 139 115 30 0.80 100 37 0 clayey sand w/gravel SC 41 0

20 21.5 355.91 354.41 poorly graded sand w/ silt SP‐SM 139 115 30 2.88 79.2 37 0 poorly graded sand w/ silt SP‐SM 32 195.3

30 31.5 345.91 344.41 silty sand SM 139 115 53 4.27 90.2 37 0 35 36.5 340.91 339.41 silty sand SM 139 115 34 4.97 72 34 0 sandstone bedrock N/A 40 401

Boring No. :

Top Bottom Top Bottom Relative

Density, %

Friction Angle

(degree) Cohesion (psf)

Friction Angle

(degree) Cohesion (psf) silty sand SM 32 453 10 11.5 367.08 365.58 silty sand SP‐SM 139 115 34 1.49 97.9 37 0 20 21.5 357.08 355.58 well‐graded sand w/ gravel SW 139 115 28 2.88 77.3 37 0 25 26.5 352.08 350.58 well‐graded sand w/ silt SW‐SM 139 115 22 3.36 66.6 34 0 30 31.5 347.08 345.58 silty gravel w/ sand GM 139 115 28 3.74 71.9 43 0 35 35.1 342.08 342.00 silty gravel w/ sand GM 139 115 50/1" 4.07 100 41 0

Boring No. :

Top Bottom Top Bottom Relative

Density, %

Friction Angle

(degree) Cohesion (psf)

Friction Angle

(degree) Cohesion (psf) silty sand SM 36 317.2 10 11.5 366.65 365.15 silty sand SM 139 115 19 1.49 75.9 34 0 well‐graded sand w/ silt & gravel SW‐SM 38 0 20 21.5 356.65 355.15 well‐graded sand w/ silt & gravel SW‐SM 139 115 57 2.63 100 39 0

23.5 23.9 353.15 352.73 well‐graded sand w/ silt & gravel SW‐SM 139 115 50/5" 2.86 100 39 0 30 31.5 346.65 345.15 well‐graded sand w/ silt & gravel SW‐SM 139 115 73 3.40 100 39 0 35 35.75 341.65 340.9 well‐graded gravel w/ silt & sand GW‐GM 139 115 50/3" 3.75 100 43 0

Groundwater Depth (ft):

Estimated

Elevation of Top Hole (ft):

332.8921 20.5

TH14‐P5B‐06 Groundwater Depth (ft):

TH14‐P5B‐05A

333.39

Layer in Elevation

(ft, NGVD 29)

26.17 Elevation of Top Hole (ft): 375.91

From Lab, Ultimate Value

From Lab, Ultimate Value

376.65

SPT

used Po, ksf

Estimated

377.08

From Lab, Ultimate Value

Type of Soil USCS Total Unit

Weight (pcf)

Dry Unit Weight

(pcf)

SPT

used Po, ksf

Layer Depth (feet)

Type of Soil USCS Total Unit

Weight (pcf)

Dry Unit Weight

(pcf)

6 371.08

Layer Depth (feet) Layer in Elevation

(ft, NGVD 29) Type of Soil USCS

Total Unit

Weight (pcf)

Dry Unit Weight

(pcf)

360.91

349.91

SPT

used Po, ksf

Estimated From Lab, Ultimate ValueLayer Depth (feet) Layer in Elevation

(ft, NGVD 29) Type of Soil USCS

Total Unit

Weight (pcf)

Dry Unit Weight

(pcf)

SPT

used Po, ksf

Groundwater Depth (ft): 22.2 Elevation of Top Hole (ft):

Groundwater Depth (ft): 16.7 Elevation of Top Hole (ft):

Layer Depth (feet) Layer in Elevation

(ft, NGVD 29)

5.3

6 370.65

360.6516

51 324.91

TH14‐P5B‐07

TH14‐P5B‐08

Estimated

353.89

Top Bottom Top Bottom Relative

Density, %

Friction Angle

(degree) Cohesion (psf)

Friction Angle

(degree) Cohesion (psf)

3 4.5 376.7 375.2 silty sand w/ gravel SMg 139 115 15 0.52 79.9 36 0 silty sand w/ gravel SMg 30 627.9

10 11.5 369.7 368.2 sandy lean clay CL 139 115 13 1.49 63.4 33 0 poorly graded sand w/silt and gravel SP‐SM 36 251.8

20 21.5 359.7 358.2 poorly graded sand w/ gravel SP 139 115 9 2.88 43.4 33 0 25 26.5 354.7 353.2 well‐graded sand w/ grave; SW 139 115 46 3.30 91.7 40 0 30 31.5 349.7 348.2 well‐graded sand w/ silt and gravel SW‐SM 139 115 48 3.68 90.4 38 0 34 34.5 345.7 345.2 well‐graded sand w/ silt and gravel SW‐SM 139 115 50/2" 3.95 100.0 39 0

Boring No. :

Top Bottom Top Bottom Relative

Density, %

Friction Angle

(degree) Cohesion (psf)

Friction Angle

(degree) Cohesion (psf) silty sand SM 37 502 5 6.5 376.9 375.4 silty sand SM 139 115 62 0.80 100 37 0 clayey sand SC 30 551 15 16.5 366.9 365.4 poorly graded sand w/ silt SP‐SM 139 115 19 2.19 69.2 35 0 poorly graded sand w/ silt SP‐SM 33 283.2 25 26.5 356.9 355.4 well‐graded sand w/ gravel SW 139 115 16 3.38 57.4 35 0 30 30.5 351.9 351.4 well‐graded sand w/ gravel SW 139 115 50/4" 3.72 100 41 0

Boring No. :

Top Bottom Top Bottom Relative

Density, %

Friction Angle

(degree) Cohesion (psf)

Friction Angle

(degree) Cohesion (psf) silty sand SM 38 0 10 11.5 361.3 359.8 poorly graded sand w/ silt & gravel SP‐SM 139 115 29 1.44 91.8 38 0 15 16.5 356.3 354.8 poorly graded sand w/ silt & gravel SP‐SM 139 115 54 1.82 100 37 0 20 21.5 351.3 349.8 well‐graded sand w/ silt & gravel SW‐SM 139 115 60 2.20 100 39 0 25 26.5 346.3 344.8 poorly graded sand w/ silt SP‐SM 139 115 27 2.59 78.1 36 0

30 32.3 341.3 339.1 poorly graded sand w/ silt SP‐SM 139 115 50/3" 3.00 100 39 0

Boring No. :

Top Bottom Top Bottom Relative

Density, %

Friction Angle

(degree) Cohesion (psf)

Friction Angle

(degree) Cohesion (psf) sandy silt ML 33 468 silty sand w/gravel SM 42 121.1

15 16.5 371.46 369.96 well‐graded sand w/ silt SW‐SM 139 115 31 2.19 86.3 37 0 silty sand SM 42 221.5

25 26.5 361.46 359.96 poorly graded sand w/ gravel SP 139 115 34 3.46 79.4 38 0 28 29.5 358.46 356.96 well‐graded sand w/ silt & gravel SW‐SM 139 115 15 3.69 54.1 33 0 30 30.4 356.46 356.04 well‐graded gravel w/silt GW‐GM 139 115 50/5" 3.80 100 41 0 35 35.3 351.46 351.21 well‐graded gravel w/silt GW‐GM 139 115 50/3" 4.18 100 41 0 40 40.4 346.46 346.04 poorly graded sand w/ silt SP‐SM 139 115 50/5" 4.57 100 39 0

380.96

Estimated From Lab, Ultimate Value

360.9

5.5 10 376.46

378.393.5

386.46

Layer Depth (feet) Layer in Elevation

(ft, NGVD 29) Type of Soil USCS

Total Unit

Weight (pcf)

Dry Unit Weight

(pcf)

SPT

used Po, ksf

Estimated

TH14‐P5B‐13 Elevation of Top Hole (ft):

From Lab, Ultimate Value

TH14‐P5B‐12

Po, ksf

11 370.9

Layer Depth (feet) Layer in Elevation

(ft, NGVD 29) Type of Soil USCS

Total Unit

Weight (pcf)

Dry Unit Weight

(pcf)

SPT

used

365.316

21 365.46

379.67

Layer Depth (feet) Layer in Elevation

(ft, NGVD 29) Type of Soil USCS

Total Unit

Weight (pcf)

Dry Unit Weight

(pcf)

TH14‐P5B‐10

Estimated From Lab, Ultimate Value

Type of Soil USCS

9.85 Elevation of Top Hole (ft): 371.31Groundwater Depth (ft):

381.89

SPT

used Po, ksf

Estimated From Lab, Ultimate Value

Groundwater Depth (ft): 22.5 Elevation of Top Hole (ft):

Groundwater Depth (ft): 23.8

Groundwater Depth (ft): 21.3 Elevation of Top Hole (ft):

Total Unit

Weight (pcf)

SPT

used Po, ksf

Dry Unit Weight

(pcf)

374.75

364.715

TH14‐P5B‐09

Layer Depth (feet) Layer in Elevation

(ft, NGVD 29)

Top Bottom Top Bottom Relative

Density, %

Friction Angle

(degree) Cohesion (psf)

Friction Angle

(degree) Cohesion (psf) sandy silt ML 38 81.5 well‐graded sand with silt SW‐SM 42 788

15 16.5 360.88 359.38 poorly graded sand w/ gravel SPg 139 115 17 1.71 69.3 36 0 20 21.5 355.88 354.38 poorly graded sand w/ gravel SPg 139 115 25 2.09 79.3 38 0 25 25.3 350.88 350.63 poorly graded sand w/ silt SP‐SM 139 115 50/3" 2.43 100 39 0

Boring No. :

Top Bottom Top Bottom Relative

Density, %

Friction Angle

(degree) Cohesion (psf)

Friction Angle

(degree) Cohesion (psf)

5 6.5 385.51 384.01 silty sand SM 139 115 43 0.80 100 38 0 sandy lean clay CL 41 0 sandy lean clay CL 45 1042 clayey sand SC 43 0 clayey sand SC 40 0

20 21.5 370.51 369.01 poorly graded sand SP 139 115 24 2.88 72.1 36 0 25 26.5 365.51 364.01 well‐graded sand w/ silts & gravel SW‐SM 139 115 38 3.58 82.7 37 0 30 31.5 360.51 359.01 well‐graded sand w/ silts & gravel SW‐SM 139 115 40 4.01 81.6 37 0

Boring No. :

Top Bottom Top Bottom Relative

Density, %

Friction Angle

(degree) Cohesion (psf)

Friction Angle

(degree) Cohesion (psf) silty sand SM 34 888.2 silty sand w/gravel SM 43 277

30 31.5 359.58 358.08 well‐graded sand w/ silt SW‐SM 139 115 21 3.57 64.2 34 0

35 36.5 354.58 353.08 poorly graded sand w/ silt SP‐SM 139 115 24 3.95 66.2 34 0

40 41.5 349.58 348.08 silty sand w/ gravel SMg 139 115 42 4.33 81.4 36 0 well‐graded sand w/ silt SW‐SM 39 0

50 51.5 339.58 338.08 poorly graded sand w/ silt SP‐SM 139 115 44 5.10 79 36 0

Boring No. :

Top Bottom Top Bottom Relative

Density, %

Friction Angle

(degree) Cohesion (psf)

Friction Angle

(degree) Cohesion (psf) poorly graded sand w/ gravel SP 44 0 10 11.5 371.4 369.9 poorly graded sand w/ silt SP‐SM 139 115 15 1.40 68.2 35 0 15 16.5 366.4 364.9 well‐graded sand w/silt & gravel SW‐SM 139 115 30 1.79 88.9 38 0 20 21.5 361.4 359.9 well‐graded sand w/silt & gravel SW‐SM 139 115 19 2.17 69.3 35 0 25 26.5 356.4 354.9 silty sand SM 139 115 49 2.55 100.0 38 0 30 31.5 351.4 349.9 well‐graded sand w/silt & gravel SW‐SM 139 115 21 2.94 67.6 35 0 35 36.5 346.4 344.9 poorly graded sand w/ silt SP‐SM 139 115 38 3.32 84.6 37 0 40 41.5 341.4 339.9 well‐graded sand w/ silt SW‐SM 139 115 11 3.70 45.7 32 0 45 46.5 336.4 334.9 silty sand w/ gravel SMg 139 115 21 4.08 61.5 33 0

50 51.5 331.4 329.9 poorly graded sand /clay SP/CL 139 115 30 4.47 70.1 37 0

374.51

15.5 375.01

6 383.58

6 375.41

Estimated From Lab, Ultimate ValueLayer Depth (feet) Layer in Elevation

(ft, NGVD 29) Type of Soil USCS

Total Unit

Weight (pcf)

Dry Unit Weight

(pcf)

SPT

used

Po, ksf

Estimated From Lab, Ultimate Value

TH14‐P5B‐15 Groundwater Depth (ft): 19.4 Elevation of Top Hole (ft): 389.58

TH14‐P5B‐15A Groundwater Depth (ft): 9.3 Elevation of Top Hole (ft): 381.41

Layer Depth (feet) Layer in Elevation

(ft, NGVD 29) Type of Soil USCS

Total Unit

Weight (pcf)

Dry Unit Weight

(pcf)

SPT

used

45.5 344.08

11 378.58

390.51

Layer Depth (feet) Layer in Elevation

(ft, NGVD 29) Type of Soil USCS

Total Unit

Weight (pcf)

Dry Unit Weight

(pcf)

SPT

used Po, ksf

Estimated From Lab, Ultimate Value

Po, ksf

From Lab, Ultimate ValueEstimated

TH14‐P5B‐13A Groundwater Depth (ft): 8.1 Elevation of Top Hole (ft): 375.88

Layer in Elevation

(ft, NGVD 29) Type of Soil USCS

Total Unit

Weight (pcf)

Layer Depth (feet) Dry Unit Weight

(pcf)

SPT

used

Elevation of Top Hole (ft):TH14‐P5B‐14 Groundwater Depth (ft): 26.45

379.51

10.5 380.01

6 369.88 11 364.88

Po, ksf

Top Bottom Top Bottom Relative

Density, %

Friction Angle

(degree) Cohesion (psf)

Friction Angle

(degree) Cohesion (psf) silty sand SM 37 0 15 16.5 375.6 374.1 poorly graded sand SP 139 115 11 2.19 51.3 34 0 20 21.5 370.6 369.1 poorly graded sand w/ silt SP‐SM 139 115 61 2.63 100 39 0 25 26.5 365.6 364.1 silty sand SM 139 115 15 3.02 57.4 32 0 30 31.5 360.6 359.1 silty sand SM 139 115 47 3.40 91.8 37 0 35 36.5 355.6 354.1 well‐graded sand w/ silt SW‐SM 139 115 37 3.78 89 38 0 40 41.5 350.6 349.1 well‐graded sand w/ silt SW‐SM 139 115 44 4.17 84.3 37 0 poorly graded sand w/ silt SP‐SM 39 160 50 51.5 340.6 339.1 silty sand SM 139 115 55 4.93 88 36 0

Boring No. :

Top Bottom Top Bottom Relative

Density, %

Friction Angle

(degree) Cohesion (psf)

Friction Angle

(degree) Cohesion (psf) silty sand w/gravel SM 37 192 25 26.5 370.4 368.9 well‐graded sand w/ silt & gravel SW‐SM 139 115 28 3.33 74.4 36 0 30 31.5 365.4 363.9 well‐graded sand w/ silt & gravel SW‐SM 139 115 66 3.72 100 39 0 40 41.5 355.4 353.9 well‐graded sand w/ silt & gravel SW‐SM 139 115 52 4.48 88.4 37 0 45 46.5 350.4 348.9 well graded sand w/ silt & gravel SW‐SM 139 115 46 4.86 81.7 37 0

Boring No. :

Top Bottom Top Bottom Relative

Density, %

Friction Angle

(degree) Cohesion (psf)

Friction Angle

(degree) Cohesion (psf)

10 11.5 374.7 373.2 poorly graded sand w/ silt SP‐SM 139 115 14 1.38 66.5 35 0 15 16.5 369.7 368.2 poorly graded sand w/ silt SP‐SM 139 115 34 1.76 94.6 38 0 20 21.5 364.7 363.2 well‐graded sand w/ silt SW‐SM 139 115 21 2.14 73.2 35 0 25 26.5 359.7 358.2 well graded sand w/ silt SW‐SM 139 115 46 2.52 98.5 39 0 30 31.5 354.7 353.2 poorly graded sand w/ silt SP‐SM 139 115 40 2.91 89.3 38 0 35 36.5 349.7 348.2 poorly graded sand w/ silt & gravel SP‐SM 139 115 70 3.29 100 39 0 40 41.5 344.7 343.2 well‐graded sand w/ silt & gravel SW‐SM 139 115 33 3.67 77.5 36 0 45 46.5 339.7 338.2 well‐graded sand w/ silt & gravel SW‐SM 139 115 49 4.06 88.8 38 0 50 51.5 334.7 333.2 well‐graded gravel w/ silt & sand GW‐GM 139 115 70 4.44 99.7 45 0

Boring No. :

Top Bottom Top Bottom Relative

Density, %

Friction Angle

(degree) Cohesion (psf)

Friction Angle

(degree) Cohesion (psf) well‐graded sand w/silt SW‐SM 39 172 10 11.5 387.5 386.0 silty sand SM 139 115 22 1.49 80.8 36 0 well‐graded sand w/silt SW‐SM 53 0 20 21.5 377.5 376.0 well‐graded sand w/ silt & gravel SW‐SM 139 115 19 2.86 65.2 34 0 25 26.5 372.5 371.0 well‐graded sand w/ silt & gravel SW‐SM 139 115 27 3.25 73.7 35 0 50 51.5 347.5 346.0 silty sand w/ gravel SM 139 115 34 5.16 71 34 0

TH14‐P5B‐18

5.5 385.07

46 344.6

6 389.43

5 392.54

Estimated From Lab, Ultimate ValueLayer Depth (feet) Layer in Elevation

(ft, NGVD 29) Type of Soil USCS

Total Unit

Weight (pcf)

Dry Unit Weight

(pcf)

SPT

used

TH14‐P5B‐16 Groundwater Depth (ft): 16.74 Elevation of Top Hole (ft): 390.57

Po, ksf

Estimated

395.43

USCS

Total Unit

Weight (pcf)

Dry Unit Weight

(pcf)

SPT

used Po, ksf

Estimated From Lab, Ultimate Value

Elevation of Top Hole (ft):

Groundwater Depth (ft): 8.85 Elevation of Top Hole (ft): 384.66

From Lab, Ultimate ValueEstimated

16 381.5

Po, ksf

Elevation of Top Hole (ft):Groundwater Depth (ft): 397.54

From Lab, Ultimate Value

USCS

Total Unit

Weight (pcf)

Dry Unit Weight

(pcf)

SPT

used

20.4

USCS

Total Unit

Weight (pcf)

Dry Unit Weight

(pcf)

SPT

used Po, ksf

Layer Depth (feet) Layer in Elevation

(ft, NGVD 29) Type of Soil

TH14‐P5B‐17 Groundwater Depth (ft): 21.8

Layer Depth (feet) Layer in Elevation

(ft, NGVD 29) Type of Soil

TH14‐P5B‐17A

Layer Depth (feet) Layer in Elevation

Top Bottom Top Bottom Relative

Density, %

Friction Angle

(degree) Cohesion (psf)

Friction Angle

(degree) Cohesion (psf)

5 6.5 399.15 397.65 clayey sand SC 139 115 14 0.80 72.4 33 0 10 11.5 394.15 392.65 silty sand SM 139 115 10 1.49 54.4 32 0 clayey sand SC 33 131 20 21.5 384.15 382.65 poorly graded sand w/ silt & gravel SP‐SM 139 115 23 2.88 70.3 35 0 25 26.5 379.15 377.65 poorly graded sand w/ silt & gravel SP‐SM 139 115 22 3.59 65.5 34 0 30 31.5 374.15 372.65 poorly graded sand SP 139 115 57 3.98 95.2 40 0 35 36.5 369.15 367.65 well‐graded gravel GW‐GM 139 115 12 4.36 45.9 34 0

Boring No. :

Top Bottom Top Bottom Relative

Density, %

Friction Angle

(degree) Cohesion (psf)

Friction Angle

(degree) Cohesion (psf) poorlyt graded sand w/silt SP‐SM 28 941 poorlyt graded sand w/silt SP‐SM 38 630

10 10.3 394.75 394.42 clayey sand SC 139 115 50/4" 1.41 100 38 0 15 15.75 389.75 389 clayey sand SC 139 115 50/3" 2.14 100 38 0 25 26.5 379.75 378.25 silty sand w/ gravel SM 139 115 15 3.51 55 33 0

Boring No. :

Top Bottom Top Bottom Relative

Density, %

Friction Angle

(degree)

Friction Angle

(degree) Cohesion (psf) poorly graded sand w/silt SP‐SM 38 0 poorly graded sand SP 51 142 poorly graded sand SP 39 280

15 16.5 330.4 328.9 silty sand w/ gravel SMg 139 115 25 1.90 81.1 36 0 20 21.5 325.4 323.9 well‐graded sand w/ silt SW‐SM 139 115 36 2.28 90.9 38 0 25 26.5 320.4 318.9 well‐graded sand w/ silt SW‐SM 139 115 44 2.67 95.5 39 0 30 31.5 315.4 313.9 well‐graded sand w/ silt & gravel SW‐SM 139 115 7 3.05 33 30 0 40 41.5 305.43 303.93 poorly graded sand w/ silt & gravel SP‐SM 139 115 69 3.81 100 39 0 45 46.5 300.43 298.93 poorly graded sand w/ gravel SP 139 115 68 4.20 100 41 0 50 51.5 295.43 293.93 well‐graded sand w/ silt & gravel SW‐SM 139 115 71 4.58 99.4 39 0

16 388.15

6 398.75

TH14‐P5B‐20

6 339.43

11 334.43

10.5 334.93

399.25

TH14‐P5B‐21A

Groundwater Depth (ft): 24.6 Elevation of Top Hole (ft): 404.75

Layer Depth (feet) Layer in Elevation

(ft, NGVD 29) Type of Soil USCS

Total Unit

Weight (pcf)

Dry Unit Weight

(pcf)

SPT

used Po, ksf

Estimated

USCS

Groundwater Depth (ft): 11.1 Elevation of Top Hole (ft):

Estimated

From Lab, Ultimate Value

345.43

Groundwater Depth (ft): 26 Elevation of Top Hole (ft): 404.15

Estimated From Lab, Ultimate Value

From Lab, Ultimate Value

USCS

Total Unit

Weight (pcf)

Dry Unit Weight

(pcf)

SPT

used Po, ksf

Layer Depth (feet) Layer in Elevation

(ft, NGVD 29) Type of Soil

5.5

TH14‐P5B‐19

Total Unit

Weight (pcf)

Dry Unit Weight

(pcf)

SPT

used Po, ksf

Layer Depth (feet) Layer in Elevation

DESIGN STRENGTH PARAMETERS BASED ON SPT CORRELATION

LSAR Reach 9 Phase 5b Anabel Pho Date: 5/7/2016

Lower Santa Ana River

Top Bottom Top Bottom Relative

Density, %

Friction Angle

(degree) Cohesion (psf)

TH14‐P5B‐19 10 11.5 394.2 392.7 silty sand SM 139 115 10 1.49 54.4 32 0 Artificial Fill TH14‐P5B‐19 5 6.5 399.2 397.7 clayey sand SC 139 115 14 0.80 72.4 33 0 Artificial Fill TH14‐P5B‐08 10 11.5 366.7 365.2 silty sand SM 139 115 19 1.49 75.9 34 0 Artificial Fill TH14‐P5B‐02 5 6.5 360.3 358.8 silty sand SM 139 115 17 0.80 80.1 36 0 Artificial Fill TH14‐P5B‐03 10 11.5 358.7 357.2 silty sand w/ gravel SMg 139 115 25 1.49 85.5 36 0 Artificial Fill TH14‐P5B‐18 10 11.5 387.5 386.0 silty sand SM 139 115 22 1.49 80.8 36 0 Artificial Fill TH14‐P5B‐04 5 6.5 365.9 364.4 silty sand SM 139 115 31 0.80 100 37 0 Artificial Fill TH14‐P5B‐05 5 6.5 368.3 366.8 poorly graded sand w/ silt & gravel SP‐SM 139 115 37 0.80 100 37 0 Artificial Fill TH14‐P5B‐06 5 6.5 370.9 369.4 silty sand w/ gravel SMg 139 115 30 0.80 100 37 0 Artificial Fill TH14‐P5B‐06 20 21.5 355.9 354.4 poorly graded sand w/ silt SP‐SM 139 115 30 2.88 79.2 37 0 Artificial Fill TH14‐P5B‐07 10 11.5 367.1 365.6 silty sand SP‐SM 139 115 34 1.49 97.9 37 0 Artificial Fill TH14‐P5B‐14 5 6.5 385.5 384.0 silty sand SM 139 115 43 0.80 100 38 0 Artificial Fill TH14‐P5B‐01 5 6.5 355.5 354.0 well‐graded sand w/ silt & gravel SW‐SM 139 115 50 0.80 100 39 0 Artificial Fill TH14‐P5B‐05 15 16.5 358.3 356.8 sandy silt ML 139 115 7 2.19 40.8 30 0 Sandy Silt/Silty Sand TH14‐P5B‐09 3 4.5 376.7 375.2 silty sand w/ gravel SMg 139 115 15 0.52 79.9 36 0 Sandy Silt/Silty Sand TH14‐P5B‐10 5 6.5 376.9 375.4 silty sand SM 139 115 62 0.80 100 37 0 Sandy Silt/Silty Sand TH14‐P5B‐16 25 26.5 365.6 364.1 silty sand SM 139 115 15 3.02 57.4 32 0 Fine Grained Older Alluvium (CL) TH14‐P5B‐09 10 11.5 369.7 368.2 sandy lean clay CL 139 115 13 1.49 63.4 33 0 Fine Grained Older Alluvium (CL) TH14‐P5B‐16 30 31.5 360.6 359.1 silty sand SM 139 115 47 3.40 91.8 37 0 Fine Grained Older Alluvium (CL) TH14‐P5B‐01 40 41.5 320.5 319.0 poorly graded sand w/ silt SP‐SM 139 115 5 4.62 16.6 28 0 Loose to Medium Dense Alluvium TH14‐P5B‐21A 30 31.5 315.4 313.9 well‐graded sand w/ silt & gravel SW‐SM 139 115 7 3.05 33 30 0 Loose to Medium Dense Alluvium TH14‐P5B‐09 20 21.5 359.7 358.2 poorly graded sand w/ gravel SP 139 115 9 2.88 43.4 33 0 Loose to Medium Dense Alluvium TH14‐P5B‐13 28 29.5 358.5 357.0 well‐graded sand w/ silt & gravel SW‐SM 139 115 15 3.69 54.1 33 0 Loose to Medium Dense Alluvium TH14‐P5B‐10 15 16.5 366.9 365.4 poorly graded sand w/ silt SP‐SM 139 115 19 2.19 69.2 35 0 Loose to Medium Dense Alluvium TH14‐P5B‐10 25 26.5 356.9 355.4 well‐graded sand w/ gravel SW 139 115 16 3.38 57.4 35 0 Loose to Medium Dense Alluvium TH14‐P5B‐13A 15 16.5 360.9 359.4 poorly graded sand w/ gravel SPg 139 115 17 1.71 69.3 36 0 Loose to Medium Dense Alluvium TH14‐P5B‐14 20 21.5 370.5 369.0 poorly graded sand SP 139 115 24 2.88 72.1 36 0 Loose to Medium Dense Alluvium TH14‐P5B‐13 25 26.5 361.5 360.0 poorly graded sand w/ gravel SP 139 115 34 3.46 79.4 38 0 Loose to Medium Dense Alluvium

Dry Unit Weight

(pcf) Boring No. : Design Stratigraphic Unit

Adopted Friction Angle (degrees)

Estimated

SPT

used Po, ksf

Layer Depth (feet) Layer in Elevation

(ft, NGVD 29) Type of Soil USCS

Total Unit

Weight (pcf)

Project Name: Calculated By:

Project Location: Checked By: SC

Lower Santa Ana River

Top Bottom Top Bottom Relative

Density, %

Friction Angle

(degree) Cohesion (psf)

Dry Unit Weight

(pcf) Boring No. : Design Stratigraphic Unit

Adopted Friction Angle (degrees)

Estimated

SPT

used Po, ksf

Layer Depth (feet) Layer in Elevation

(ft, NGVD 29) Type of Soil USCS

Total Unit

Weight (pcf)

Project Name: Calculated By:

Project Location: Checked By:

TH14‐P5B‐03 45 46.5 323.7 322.2 silty sand w/ gravel SMg 139 115 11 5.21 41.8 31 0 Medium Dense to Dense Alluvium TH14‐P5B‐05 35 36.5 338.3 336.8 sandy silt ML 139 115 23 4.67 61.5 32 0 Medium Dense to Dense Alluvium TH14‐P5B‐15A 40 41.5 341.4 339.9 well‐graded sand w/ silt SW‐SM 139 115 11 3.70 45.7 32 0 Medium Dense to Dense Alluvium TH14‐P5B‐02A 12 13.5 342.4 340.9 well‐graded sand w/ silt & gravel SW‐SM 139 115 11 1.77 54.6 33 0 Medium Dense to Dense Alluvium TH14‐P5B‐05 45 46.5 328.3 326.8 poorly graded sand w/ silt SP‐SM 139 115 21 5.44 56.8 33 0 Medium Dense to Dense Alluvium TH14‐P5B‐05A 25 26.5 328.9 327.4 well‐graded sand w/ silt &gravel SW‐SM 139 115 13 2.30 57.2 33 0 Medium Dense to Dense Alluvium TH14‐P5B‐15A 45 46.5 336.4 334.9 silty sand w/ gravel SMg 139 115 21 4.08 61.5 33 0 Medium Dense to Dense Alluvium TH14‐P5B‐20 25 26.5 379.8 378.3 silty sand w/ gravel SM 139 115 15 3.51 55 33 0 Medium Dense to Dense Alluvium TH14‐P5B‐02 15 16.5 350.3 348.8 well‐graded sand w/ silt SW‐SM 139 115 16 2.19 64.4 34 0 Medium Dense to Dense Alluvium TH14‐P5B‐02A 10 11.5 344.4 342.9 well‐graded sand w/ silt & gravel SW‐SM 139 115 16 1.49 69.3 34 0 Medium Dense to Dense Alluvium TH14‐P5B‐02A 22.5 24 331.9 330.4 well‐graded sand w/ silt & gravel SW‐SM 139 115 15 2.69 59.1 34 0 Medium Dense to Dense Alluvium TH14‐P5B‐04 20 21.5 350.9 349.4 poorly graded sand w/ gravel SPg 139 115 13 2.88 53.5 34 0 Medium Dense to Dense Alluvium TH14‐P5B‐04 30 31.5 340.9 339.4 poorly graded sand w/ silt& gravel SP‐SM 139 115 23 4.10 64.2 34 0 Medium Dense to Dense Alluvium TH14‐P5B‐07 25 26.5 352.1 350.6 well‐graded sand w/ silt SW‐SM 139 115 22 3.36 66.6 34 0 Medium Dense to Dense Alluvium TH14‐P5B‐15 30 31.5 359.6 358.1 well‐graded sand w/ silt SW‐SM 139 115 21 3.57 64.2 34 0 Medium Dense to Dense Alluvium TH14‐P5B‐15 35 36.5 354.6 353.1 poorly graded sand w/ silt SP‐SM 139 115 24 3.95 66.2 34 0 Medium Dense to Dense Alluvium TH14‐P5B‐16 15 16.5 375.6 374.1 poorly graded sand SP 139 115 11 2.19 51.3 34 0 Medium Dense to Dense Alluvium TH14‐P5B‐18 20 21.5 377.5 376.0 well‐graded sand w/ silt & gravel SW‐SM 139 115 19 2.86 65.2 34 0 Medium Dense to Dense Alluvium TH14‐P5B‐19 25 26.5 379.2 377.7 poorly graded sand w/ silt & gravel SP‐SM 139 115 22 3.59 65.5 34 0 Medium Dense to Dense Alluvium TH14‐P5B‐19 35 36.5 369.2 367.7 well‐graded gravel GW‐GM 139 115 12 4.36 45.9 34 0 Medium Dense to Dense Alluvium TH14‐P5B‐01 24 25.5 336.5 335.0 well‐graded sand w/ silt & gravel SW‐SM 139 115 24 3.39 68.9 35 0 Medium Dense to Dense Alluvium TH14‐P5B‐02 30 31.5 335.3 333.8 well‐graded sand w/ silt SW‐SM 139 115 29 4.05 71.3 35 0 Medium Dense to Dense Alluvium TH14‐P5B‐15A 10 11.5 371.4 369.9 poorly graded sand w/ silt SP‐SM 139 115 15 1.40 68.2 35 0 Medium Dense to Dense Alluvium TH14‐P5B‐15A 20 21.5 361.4 359.9 well‐graded sand w/silt & gravel SW‐SM 139 115 19 2.17 69.3 35 0 Medium Dense to Dense Alluvium TH14‐P5B‐17A 10 11.5 374.7 373.2 poorly graded sand w/ silt SP‐SM 139 115 14 1.38 66.5 35 0 Medium Dense to Dense Alluvium TH14‐P5B‐18 25 26.5 372.5 371.0 well‐graded sand w/ silt & gravel SW‐SM 139 115 27 3.25 73.7 35 0 Medium Dense to Dense Alluvium TH14‐P5B‐19 20 21.5 384.2 382.7 poorly graded sand w/ silt & gravel SP‐SM 139 115 23 2.88 70.3 35 0 Medium Dense to Dense Alluvium TH14‐P5B‐02A 20 21.5 334.4 332.9 well‐graded sand w/ silt & gravel SW‐SM 139 115 27 2.49 78.7 36 0 Medium Dense to Dense Alluvium TH14‐P5B‐03 20 21.5 348.7 347.2 poorly graded sand SP 139 115 19 2.88 65.1 36 0 Medium Dense to Dense Alluvium TH14‐P5B‐03 30 31.5 338.7 337.2 poorly graded sand SP 139 115 24 4.06 65.7 36 0 Medium Dense to Dense Alluvium TH14‐P5B‐03A 20 21.5 337.1 335.6 well‐graded sand w/ silt & gravel SW‐SM 139 115 24 2.46 75.3 36 0 Medium Dense to Dense Alluvium TH14‐P5B‐05A 5 6.5 348.9 347.4 poorly graded sand w/ silt & gravel SP‐SM 139 115 17 0.77 80.6 36 0 Medium Dense to Dense Alluvium TH14‐P5B‐17 25 26.5 370.4 368.9 well‐graded sand w/ silt & gravel SW‐SM 139 115 28 3.33 74.4 36 0 Medium Dense to Dense Alluvium TH14‐P5B‐21A 15 16.5 330.4 328.9 silty sand w/ gravel SMg 139 115 25 1.90 81.1 36 0 Medium Dense to Dense Alluvium TH14‐P5B‐02A 15 16.5 339.4 337.9 well‐graded sand w/ silt & gravel SW‐SM 139 115 26 2.11 80.4 37 0 Medium Dense to Dense Alluvium TH14‐P5B‐03A 15 16.5 342.1 340.6 well‐graded sand w/silt & gravel SW‐SM 139 115 27 2.08 82.2 37 0 Medium Dense to Dense Alluvium TH14‐P5B‐07 20 21.5 357.1 355.6 well‐graded sand w/ gravel SW 139 115 28 2.88 77.3 37 0 Medium Dense to Dense Alluvium TH14‐P5B‐13 15 16.5 371.5 370.0 well‐graded sand w/ silt SW‐SM 139 115 31 2.19 86.3 37 0 Medium Dense to Dense Alluvium TH14‐P5B‐01 14 15.5 346.5 345.0 poorly graded sand SP 139 115 27 2.05 82.5 38 0 Medium Dense to Dense Alluvium TH14‐P5B‐12 10 11.5 361.3 359.8 poorly graded sand w/ silt & gravel SP‐SM 139 115 29 1.44 91.8 38 0 Medium Dense to Dense Alluvium TH14‐P5B‐15A 15 16.5 366.4 364.9 well‐graded sand w/silt & gravel SW‐SM 139 115 30 1.79 88.9 38 0 Medium Dense to Dense Alluvium TH14‐P5B‐16 20 21.5 370.6 369.1 poorly graded sand w/ silt SP‐SM 139 115 61 2.63 100 39 0 Medium Dense to Dense Alluvium TH14‐P5B‐07 30 31.5 347.1 345.6 silty gravel w/ sand GM 139 115 28 3.74 71.9 43 0 Medium Dense to Dense Alluvium TH14‐P5B‐05A 10 11.5 343.9 342.4 well‐graded gravel w/ silt & sand GW‐GM 139 115 28 1.15 94.6 44 0 Medium Dense to Dense Alluvium TH14‐P5B‐05A 15 16.5 338.9 337.4 well‐graded gravel w/ silt & sand GW‐GM 139 115 32 1.54 94.8 44 0 Medium Dense to Dense Alluvium

Lower Santa Ana River

Top Bottom Top Bottom Relative

Density, %

Friction Angle

(degree) Cohesion (psf)

Dry Unit Weight

(pcf) Boring No. : Design Stratigraphic Unit

Adopted Friction Angle (degrees)

Estimated

SPT

used Po, ksf

Layer Depth (feet) Layer in Elevation

(ft, NGVD 29) Type of Soil USCS

Total Unit

Weight (pcf)

Project Name: Calculated By:

Project Location: Checked By:

TH14‐P5B‐06 35 36.5 340.9 339.4 silty sand SM 139 115 34 4.97 72 34 0 Dense to Very Dense Alluvium TH14‐P5B‐18 50 51.5 347.5 346.0 silty sand w/ gravel SM 139 115 34 5.16 71 34 0 Dense to Very Dense Alluvium TH14‐P5B‐15A 30 31.5 351.4 349.9 well‐graded sand w/silt & gravel SW‐SM 139 115 21 2.94 67.6 35 0 Dense to Very Dense Alluvium TH14‐P5B‐17A 20 21.5 364.7 363.2 well‐graded sand w/ silt SW‐SM 139 115 21 2.14 73.2 35 0 Dense to Very Dense Alluvium TH14‐P5B‐12 25 26.5 346.3 344.8 poorly graded sand w/ silt SP‐SM 139 115 27 2.59 78.1 36 0 Dense to Very Dense Alluvium TH14‐P5B‐15 40 41.5 349.6 348.1 silty sand w/ gravel SMg 139 115 42 4.33 81.4 36 0 Dense to Very Dense Alluvium TH14‐P5B‐15 50 51.5 339.6 338.1 poorly graded sand w/ silt SP‐SM 139 115 44 5.10 79 36 0 Dense to Very Dense Alluvium TH14‐P5B‐16 50 51.5 340.6 339.1 silty sand SM 139 115 55 4.93 88 36 0 Dense to Very Dense Alluvium TH14‐P5B‐17A 40 41.5 344.7 343.2 well‐graded sand w/ silt & gravel SW‐SM 139 115 33 3.67 77.5 36 0 Dense to Very Dense Alluvium TH14‐P5B‐02 45 46.5 320.3 318.8 silty sand w/ gravel SMg 139 115 58 5.20 88.4 37 0 Dense to Very Dense Alluvium TH14‐P5B‐02A 25 26.5 329.4 327.9 well‐graded sand w/ silt & gravel SW‐SM 139 115 35 2.88 84.9 37 0 Dense to Very Dense Alluvium TH14‐P5B‐02A 35 36.5 319.4 317.9 well‐graded sand w/ silt SW‐SM 139 115 36 3.64 80 37 0 Dense to Very Dense Alluvium TH14‐P5B‐03 35 36.5 333.7 332.2 well‐graded sand w/ silt SW‐SM 139 115 46 4.44 84.3 37 0 Dense to Very Dense Alluvium TH14‐P5B‐03A 30 31.5 327.1 325.6 well‐graded sand w/ silt SW‐SM 139 115 35 3.23 82.1 37 0 Dense to Very Dense Alluvium TH14‐P5B‐05A 35 36.5 318.9 317.4 poorly graded sand w/ silt & gravel SP‐SM 139 115 36 3.07 84.5 37 0 Dense to Very Dense Alluvium TH14‐P5B‐06 30 31.5 345.9 344.4 silty sand SM 139 115 53 4.27 90.2 37 0 Dense to Very Dense Alluvium TH14‐P5B‐12 15 16.5 356.3 354.8 poorly graded sand w/ silt & gravel SP‐SM 139 115 54 1.82 100 37 0 Dense to Very Dense Alluvium TH14‐P5B‐14 25 26.5 365.5 364.0 well‐graded sand w/ silts & gravel SW‐SM 139 115 38 3.58 82.7 37 0 Dense to Very Dense Alluvium TH14‐P5B‐14 30 31.5 360.5 359.0 well‐graded sand w/ silts & gravel SW‐SM 139 115 40 4.01 81.6 37 0 Dense to Very Dense Alluvium TH14‐P5B‐15A 35 36.5 346.4 344.9 poorly graded sand w/ silt SP‐SM 139 115 38 3.32 84.6 37 0 Dense to Very Dense Alluvium TH14‐P5B‐15A 50 51.5 331.4 329.9 poorly graded sand /clay SP/CL 139 115 30 4.47 70.1 37 0 Dense to Very Dense Alluvium TH14‐P5B‐16 40 41.5 350.6 349.1 well‐graded sand w/ silt SW‐SM 139 115 44 4.17 84.3 37 0 Dense to Very Dense Alluvium TH14‐P5B‐17 40 41.5 355.4 353.9 well‐graded sand w/ silt & gravel SW‐SM 139 115 52 4.48 88.4 37 0 Dense to Very Dense Alluvium TH14‐P5B‐17 45 46.5 350.4 348.9 well graded sand w/ silt & gravel SW‐SM 139 115 46 4.86 81.7 37 0 Dense to Very Dense Alluvium TH14‐P5B‐03A 40 41.5 317.1 315.6 well‐graded sand w/ silt SW‐SM 139 115 46 4.00 87 38 0 Dense to Very Dense Alluvium TH14‐P5B‐05 25 26.5 348.3 346.8 well‐graded sand w/ gravel SWg 139 115 38 3.58 82.7 38 0 Dense to Very Dense Alluvium TH14‐P5B‐05 30 31.5 343.3 341.8 well‐graded sand w/ gravel SWg 139 115 39 4.27 79.2 38 0 Dense to Very Dense Alluvium TH14‐P5B‐05 48 49.5 325.3 323.8 poorly graded sand w/ silt SP‐SM 139 115 58 5.66 86.3 38 0 Dense to Very Dense Alluvium TH14‐P5B‐09 30 31.5 349.7 348.2 well‐graded sand w/ silt and gravel SW‐SM 139 115 48 3.68 90.4 38 0 Dense to Very Dense Alluvium TH14‐P5B‐13A 20 21.5 355.9 354.4 poorly graded sand w/ gravel SPg 139 115 25 2.09 79.3 38 0 Dense to Very Dense Alluvium TH14‐P5B‐15A 25 26.5 356.4 354.9 silty sand SM 139 115 49 2.55 100 38 0 Dense to Very Dense Alluvium TH14‐P5B‐16 35 36.5 355.6 354.1 well‐graded sand w/ silt SW‐SM 139 115 37 3.78 89 38 0 Dense to Very Dense Alluvium TH14‐P5B‐17A 15 16.5 369.7 368.2 poorly graded sand w/ silt SP‐SM 139 115 34 1.76 94.6 38 0 Dense to Very Dense Alluvium TH14‐P5B‐17A 30 31.5 354.7 353.2 poorly graded sand w/ silt SP‐SM 139 115 40 2.91 89.3 38 0 Dense to Very Dense Alluvium TH14‐P5B‐17A 45 46.5 339.7 338.2 well‐graded sand w/ silt & gravel SW‐SM 139 115 49 4.06 88.8 38 0 Dense to Very Dense Alluvium TH14‐P5B‐20 10 10.33333 394.8 394.4 clayey sand SC 139 115 50/4" 1.41 100 38 0 Dense to Very Dense Alluvium TH14‐P5B‐20 15 15.75 389.8 389.0 clayey sand SC 139 115 50/3" 2.14 100 38 0 Dense to Very Dense Alluvium TH14‐P5B‐21A 20 21.5 325.4 323.9 well‐graded sand w/ silt SW‐SM 139 115 36 2.28 90.9 38 0 Dense to Very Dense Alluvium TH14‐P5B‐01 50 50.41667 310.5 310.0 poorly graded sand w/ silt SP‐SM 139 115 50/5" 5.34 100 39 0 Dense to Very Dense Alluvium TH14‐P5B‐02A 30 31.5 324.4 322.9 well‐graded sand w/ silt SW‐SM 139 115 74 3.26 100 39 0 Dense to Very Dense Alluvium TH14‐P5B‐03 40 41.5 328.7 327.2 well‐graded sand w/ silt SW‐SM 139 115 74 4.82 99.5 39 0 Dense to Very Dense Alluvium TH14‐P5B‐05A 40 41.5 313.9 312.4 poorly graded sand w/ silt & gravel SP‐SM 139 115 57 3.45 98.8 39 0 Dense to Very Dense Alluvium TH14‐P5B‐05A 45 45.16667 308.9 308.7 poorly graded sand w/ silt & gravel SP‐SM 139 115 50/2" 3.78 100 39 0 Dense to Very Dense Alluvium TH14‐P5B‐05A 50 51.5 303.9 302.4 poorly graded sand w/ silt & gravel SP‐SM 139 115 62 4.22 96.8 39 0 Dense to Very Dense Alluvium TH14‐P5B‐08 20 21.5 356.7 355.2 well‐graded sand w/ silt & gravel SW‐SM 139 115 57 2.63 100 39 0 Dense to Very Dense Alluvium TH14‐P5B‐08 23.5 23.91667 353.2 352.7 well‐graded sand w/ silt & gravel SW‐SM 139 115 50/5" 2.86 100 39 0 Dense to Very Dense Alluvium TH14‐P5B‐08 30 31.5 346.7 345.2 well‐graded sand w/ silt & gravel SW‐SM 139 115 73 3.40 100 39 0 Dense to Very Dense Alluvium TH14‐P5B‐09 34 34.5 345.7 345.2 well‐graded sand w/ silt and gravel SW‐SM 139 115 50/2" 3.95 100 39 0 Dense to Very Dense Alluvium TH14‐P5B‐12 20 21.5 351.3 349.8 well‐graded sand w/ silt & gravel SW‐SM 139 115 60 2.20 100 39 0 Dense to Very Dense Alluvium TH14‐P5B‐12 30 32.25 341.3 339.1 poorly graded sand w/ silt SP‐SM 139 115 50/3" 3.00 100 39 0 Dense to Very Dense Alluvium TH14‐P5B‐13 40 40.41667 346.5 346.0 poorly graded sand w/ silt SP‐SM 139 115 50/5" 4.57 100 39 0 Dense to Very Dense Alluvium TH14‐P5B‐13A 25 25.25 350.9 350.6 poorly graded sand w/ silt SP‐SM 139 115 50/3" 2.43 100 39 0 Dense to Very Dense Alluvium TH14‐P5B‐17 30 31.5 365.4 363.9 well‐graded sand w/ silt & gravel SW‐SM 139 115 66 3.72 100 39 0 Dense to Very Dense Alluvium

Lower Santa Ana River

Top Bottom Top Bottom Relative

Density, %

Friction Angle

(degree) Cohesion (psf)

Dry Unit Weight

(pcf) Boring No. : Design Stratigraphic Unit

Adopted Friction Angle (degrees)

Estimated

SPT

used Po, ksf

Layer Depth (feet) Layer in Elevation

(ft, NGVD 29) Type of Soil USCS

Total Unit

Weight (pcf)

Project Name: Calculated By:

Project Location: Checked By:

TH14‐P5B‐17A 25 26.5 359.7 358.2 well graded sand w/ silt SW‐SM 139 115 46 2.52 98.5 39 0 Dense to Very Dense Alluvium TH14‐P5B‐17A 35 36.5 349.7 348.2 poorly graded sand w/ silt & gravel SP‐SM 139 115 70 3.29 100 39 0 Dense to Very Dense Alluvium TH14‐P5B‐21A 25 26.5 320.4 318.9 well‐graded sand w/ silt SW‐SM 139 115 44 2.67 95.5 39 0 Dense to Very Dense Alluvium TH14‐P5B‐21A 40 41.5 305.4 303.9 poorly graded sand w/ silt & gravel SP‐SM 139 115 69 3.81 100 39 0 Dense to Very Dense Alluvium TH14‐P5B‐21A 50 51.5 295.4 293.9 well‐graded sand w/ silt & gravel SW‐SM 139 115 71 4.58 99.4 39 0 Dense to Very Dense Alluvium TH14‐P5B‐09 25 26.5 354.7 353.2 well‐graded sand w/ grave; SW 139 115 46 3.30 91.7 40 0 Dense to Very Dense Alluvium TH14‐P5B‐19 30 31.5 374.2 372.7 poorly graded sand SP 139 115 57 3.98 95.2 40 0 Dense to Very Dense Alluvium TH14‐P5B‐07 35 35.08333 342.1 342.0 silty gravel w/ sand GM 139 115 50/1" 4.07 100 41 0 Dense to Very Dense Alluvium TH14‐P5B‐10 30 30.5 351.9 351.4 well‐graded sand w/ gravel SW 139 115 50/4" 3.72 100 41 0 Dense to Very Dense Alluvium TH14‐P5B‐13 30 30.41667 356.5 356.0 well‐graded gravel w/silt GW‐GM 139 115 50/5" 3.80 100 41 0 Dense to Very Dense Alluvium TH14‐P5B‐13 35 35.25 351.5 351.2 well‐graded gravel w/silt GW‐GM 139 115 50/3" 4.18 100 41 0 Dense to Very Dense Alluvium TH14‐P5B‐21A 45 46.5 300.4 298.9 poorly graded sand w/ gravel SP 139 115 68 4.20 100 41 0 Dense to Very Dense Alluvium TH14‐P5B‐02 40 41.5 325.3 323.8 well‐graded sand w/ silt & gravel SW‐SM 139 115 50/6" 4.81 100 42 0 Dense to Very Dense Alluvium TH14‐P5B‐02A 40 41.5 314.4 312.9 well‐graded sand w/ silt SW‐SM 139 115 50/0" 4.03 100 42 0 Dense to Very Dense Alluvium TH14‐P5B‐03A 45 46.5 312.1 310.6 poorly graded gravel w/ silt and sand GP‐GM 139 115 55 4.38 91 42 0 Dense to Very Dense Alluvium TH14‐P5B‐03A 50 51.5 307.1 305.6 poorly graded gravel w/ silt and sand GP‐GM 139 115 60 4.76 92.1 42 0 Dense to Very Dense Alluvium TH14‐P5B‐05A 30 31.5 323.9 322.4 poorly graded gravel w/ sand GP 139 115 48 2.69 98.5 42 0 Dense to Very Dense Alluvium TH14‐P5B‐03A 25 26.5 332.1 330.6 well‐graded gravel w/ silt & sand GW‐GM 139 115 70 2.85 100 43 0 Dense to Very Dense Alluvium TH14‐P5B‐08 35 35.75 341.7 340.9 well‐graded gravel w/ silt & sand GW‐GM 139 115 50/3" 3.75 100 43 0 Dense to Very Dense Alluvium TH14‐P5B‐17A 50 51.5 334.7 333.2 well‐graded gravel w/ silt & sand GW‐GM 139 115 70 4.44 99.7 45 0 Dense to Very Dense Alluvium

Attachment G

Slope Stability Analysis

PROJECT LSAR Reach 9 Phase 5B SHEET NO. 1 OF 3 SHEETS

ITEM Slope Stability Analyses DATE 5/09/16 _____

FILE ___________________________

COMPUTED BY ML CHECKED BY SC REF. DRWG. NO. ________________

Limit equilibrium static slope stability analyses were conducted to determine factors of safety of the proposed bank protection using GeoStudio (Slope/W) 2012. Factors of safety for the critical failure slip surfaces were calculated using Spencer’s Method which satisfies all conditions of force and moment equilibrium. Cross sections at Station 1360+00, 1389+10, and 1398+00 were selected to represent the most critical sections along the project alignment. Factors for the selection of the critical cross sections included the height of the temporary slopes, cross section geometry, groundwater conditions, and estimated soil shear strengths. The subsurface profile and adopted design strength parameters were based on site investigations, characterization of physical soil samples, SPT and BPT blow counts, CPT data interpretation, laboratory testing, and engineering judgment.

Loading Cases EM 1110-2-1902 and EM 1110-2-1913 provide guidance and methods for analysis of slope stability. In addition, these Engineer Manuals provide minimum acceptable factors of safety for prescribed loading conditions. The loading conditions analyzed for this project are described below.

Temporary Cut Slopes - During Construction: Dewatering will be required for the project. It was assumed the dewatering efforts have lowered the groundwater table to the elevation corresponding to 5 feet below the bottom of the excavation subgrade. The cut slopes are 2H: 1V and 1.5H:1V; each slope was analyzed separately.

End of Construction: Construction of the 24-inch thick grouted stone revetment is complete, “toe-down” excavation is backfilled, construction dewatering system has been decommissioned, and groundwater levels have stabilized to historic average elevations. Historic average groundwater elevations were adopted using data collected from four instrumented monitoring wells constructed along the project alignment.

Steady Seepage - Full flood stage: The project is designed to provide erosion protection for the 190-year flood event. Full flood stage condition for the 190-yr event includes three feet of freeboard. The grouted stone protected slopes were analyzed assuming a fully developed phreatic surface at the full flood stage condition.

Sudden Drawdown: This case represents an extended full flood stage with a fully developed phreatic surface and the river level suddenly drops faster than the soils can drain. This condition can result in the development of excess pore water pressure which may result in the slope becoming unstable. However, the soil conditions along this project alignment are predominately free draining coarse alluvium. In addition, the design includes a subdrain system behind the grouted stone. Therefore, the sudden drawdown case will most likely not create an unstable slope condition for this project.

Earthquake Seismic stability was analyzed using the pseudostatic procedure. Earthquake loading was represented by a seismic load coefficient (k) equal to 50% of the peak horizontal ground acceleration (PGA) for the Operating Basis Earthquake (OBE) and the Maximum Design Earthquake (MDE). The MDE PGA= 0.75g and the OBE PGA = 0.24g.

PROJECT LSAR Reach 9 Phase 5B SHEET NO. 2 OF 3 SHEETS

ITEM Slope Stability Analyses DATE 5/09/16 _____

FILE…