HomeMy WebLinkAboutCUP 2022-0010; CARLSBAD DESALINATION PLANT PHASE 2; FINAL SOILS REPORT; 2025-08-28
certerra.com 12130 Santa Margarita Ct, Rancho Cucamonga, CA 91730 (909) 989-1751
Kiewit Infrastructure West Co. August 28, 2025
4650 Business Center Drive
Fairfield, CA 94534
Subject: Final Soil Compaction Report
Carlsbad Desalination Plant Phase 2 – Intake Modifications
4600 Carlsbad Blvd,
Carlsbad, CA 92008
The purpose of this report is to document that earthwork for the Carlsbad Desalination Plant has been completed in
conformance with the recommendations of the project geotechnical report and relevant project documents.
A series of in place density (compaction) tests were taken within the subject site at the locations listed herein from
February 3, 2023, and continuing through May 16, 2025. The compaction tests were taken in subgrade, base, and
utility trenches.
Field testing was by the direct transmission nuclear method, ASTM D6938. The maximum density – optimum
moisture relationship was established in the laboratory by the ASTM D1557 test method. Testing was performed
after compaction operations were completed and the methods used in compacting the tested materials were not
observed by our representative.
The field density tests were taken at locations selected by our representative and do not constitute certification of
compaction of the subject improvements. We have performed the tests, as previously described, in accordance to
generally accepted soil testing practices. No other warranty, express or implied, is made.
A summary of the results of all tests performed is attached.
We trust that this letter will serve your needs at this time. In you have any questions or require further
assistance, please do not hesitate to contact us.
Respectfully,
RMA Group
Slawek Dymerski, P.E, G.E
President
GE 2764
MAXIMUM DENSITY - OPTIMUM MOISTURE RELATIONSHIPS
Soil Test Optimum Maximum
Type Method1 Description Moisture Density
(%) (pcf)
certerra.com 12130 Santa Margarita Ct, Rancho Cucamonga, CA 91730 (909) 989-1751
1 M Reddish Brown Silty Sand W/ Gravel 10.3 126.1
2
3
4
5
6
7
8
9
M
M
M
M
M
M
M
M
Electrical Building
Feeder Vaults
Brown Sandy Clay
Tan Silty Sand W/ Gravel
Tan Silty Sand
Brown Sandy Silt W/ Aggregates
Crushed Aggregate Base
Brown Silty Sand
11.5
11.4
11.0
11.0
13.3
8.9
6.3
9.5
125.4
124.5
121.4
122.3
121.2
127.4
138.7
129.7
1Test Method
M – ASTM D1557 (Maximum Density Optimum Moisture Content Relationship)
IN-PLACE DENSITIES
Test Item2 Test3 Test Dry Relative Soil
No. Date Tested Location Method Depth Moisture Density Compaction Type
(ft) (%) (pcf) (%)
certerra.com 12130 Santa Margarita Ct, Rancho Cucamonga, CA 91730 (909) 989-1751
1 2/13/23 UT Next To 2” PW Pipe N 0.0 7.7 120.5 92.9 9
2 2/13/23 UT 15’ South East Of The End Of Pipe N 3.0 7.9 122.7 94.6 9
3 2/13/23 UT 30’ South East Of End Of Pipe N 2.0 8.7 123.6 95.3 9
4 8/3/23 UT Electrical Duct Bank #9 N 5.0 19.6 119.3 95.8 3
5 8/4/23 UT Electrical Duct Bank #9 N 5.0 9.7 116.8 95.5 5
6 8/10/23 UT Electrical Duct Bank #9 N 1.0 11.7 121.1 99.8 4
7 8/10/23 UT Electrical Duct Bank #9 N 2.0 11.9 119.9 98.8 4
8 10/2/23 UT Electrical Duct Bank 8A N 4.0 9.9 117.0 95.7 5
9 10/24/23 UT Electrical Duct Bank 8a. N 1.0 11.3 116.3 95.8 4
10 11/10/24 SG Boat Ramp Stairs Founda�on N 5.6 9.1 116.5 95.3 5
11 1/25/24 EM Electrical Trench Number 12 N 5.0 20.9 105.7 84.3 2
12 1/30/24 EM Electrical Trench Number 12 N 5.0 15.1 120.5 96.1 2
13 1/30/24 SZ Electrical Bldg Pad N 3.1 8.4 120.4 95.5 1
14 1/30/24 FL Electrical Bldg Pad N 3.0 8.3 120.1 95.2 1
15 1/30/24 FL Electrical Bldg Pad N 2.2 8.4 119.9 95.1 1
16 1/30/24 FL Electrical Bldg Pad N 2.0 8.5 120.6 95.6 1
17 1/30/24 FL Electrical Bldg Pad N 1.0 8.3 121.7 96.5 1
18 1/30/24 FG Electrical Bldg Pad N 0.0 8.7 121.1 96.0 1
19 1/31/24 UT Electrical Duct Bank 12-3 N 1.0 12.9 114.4 93.5 5
20 2/13/24 UT Electrical Duct Bank #9 N 4.5 10.0 116.5 95.3 5
21 2/22/24 UT Electrical Duct Bank #9 N 1.0 10.9 120.7 98.7 5
22 3/22/24 UT Electrical Duct Bank N 4.0 12.1 116.1 95.6 4
23 4/4/24 SG Pile Slab, S Pile N 8.0 12.1 116.5 95.3 5
24 4/5/24 SG Pile Slab, S Pile N 8.0 11.2 119.9 98.0 5
25 4/9/25 SG East Side Of DSS (Roadway) N 6.3 12.9 116.2 95.0 5
26 4/9/25 SG East Side Of DSS (Roadway) N 5.3 12.8 117.0 95.7 5
IN-PLACE DENSITIES
Test Item2 Test3 Test Dry Relative Soil
No. Date Tested Location Method Depth Moisture Density Compaction Type
(ft) (%) (pcf) (%)
certerra.com 12130 Santa Margarita Ct, Rancho Cucamonga, CA 91730 (909) 989-1751
27 5/22/24 SG Condenser Pad N 1.5 12.4 119.1 98.3 6
28 5/22/24 SG Condenser Pad N 1.5 13.4 118.7 97.9 6
29 6/11/24 UT North Of Bent 8 N 0.0 12.2 116.4 95.2 5
30 6/11/24 UT North Of Bent 8 N 0.0 13.5 109.7 90.5 6
31 6/14/24 SG Backwash Pump Pipeline N 5.0 13.0 118.0 97.4 6
32 6/19/24 SG IPS Discharge Access, North Side N 1.0 10.2 113.3 93.5 6
33 6/19/24 SG West Intake Vault, North Side. N 19.5 11.7 111.1 91.7 6
34 6/19/24 SG West Intake Vault, East Side N 18.5 13.1 114.1 94.1 6
35 6/19/24 SG West Intake Vault, East Side N 17.1 11.6 114.8 94.7 6
36 6/19/24 SG West Intake Vault, North Side N 16.1 11.7 112.4 92.7 6
37 6/20/24 SG West Intake Vault, East Side N 15.8 11.8 115.3 90.5 7
38 6/20/24 SG West Intake Vault, South Side. N 14.8 12.1 114.9 90.2 7
39 6/20/24 SG West Intake Vault, North Side N 13.8 12.2 115.6 90.7 7
40 6/27/24 SG Internal Pump Sta�on N 12.8 12.4 112.3 92.7 6
41 6/27/24 SG Internal Pump Sta�on N 11.8 12.6 112.0 92.4 6
42 6/27/24 SG Internal Pump Sta�on N 10.8 12.3 112.1 92.5 6
43 6/28/24 SG Ips Intake Vault, East Vault N 9.1 13.1 110.2 90.9 6
44 6/28/24 SG Ips P, Intake Vault, West Vault N 7.1 11.9 110.2 90.9 6
45 6/28/24 SG Ips, Intake Vault, Center Area N 8.1 12.9 115.1 95.0 6
46 7/2/24 SG IPS Intake Vault, Center Area N 6.1 10.8 114.9 90.2 7
47 7/2/24 SG IPS, Intake Vault, East Center N 5.1 10.6 116.1 91.1 7
48 7/15/24 UT E/O Debris Sor�ng Sta�on N 4.0 13.5 109.5 90.3 6
49 7/19/24 SG IPS Intake Vault, East Side N 6.1 11.6 115.0 90.3 7
50 7/19/24 SG Ips Intake Vault, Center. N 5.1 10.6 116.7 91.6 7
51 7/19/24 SG IPS Intake Vault, West Side. N 4.1 11.2 116.6 91.5 7
52 7/26/24 UT Internal Pump Sta�on N 2.0 9.3 113.2 93.4 6
53 8/15/24 SG Ips Manhole N 9.0 12.2 109.5 90.3 6
IN-PLACE DENSITIES
Test Item2 Test3 Test Dry Relative Soil
No. Date Tested Location Method Depth Moisture Density Compaction Type
(ft) (%) (pcf) (%)
certerra.com 12130 Santa Margarita Ct, Rancho Cucamonga, CA 91730 (909) 989-1751
54 8/15/24 SG Brine Discharge Pipe In IPS N 11.0 13.2 114.3 94.3 6
55 8/15/24 SG Ips Manhole N 12.0 13.1 115.3 95.1 6
56 8/16/24 SG North Side Of Manhole, In IPS N 7.0 13.4 117.9 97.3 6
57 8/16/24 SG South Side Of Manhole In IPS N 5.0 13.2 113.3 93.5 6
58 8/16/24 SG 63” Brine Discharge Pipe In IPS. N 3.0 13.0 112.5 92.8 6
59 8/16/24 SG 63” Brine Discharge In IPS. N 1.0 13.3 109.6 90.4 6
60 8/22/24 SG Bulkhead Tie In Vaults N 4.0 13.4 114.8 90.1 9
61 8/22/24 SG Bulkhead Tie In Vaults N 3.0 12.2 117.5 92.2 7
62 8/22/24 SG Bulkhead Tie In Vaults N 2.0 12.9 115.1 90.3 7
63 8/26/24 SG Ips, West Tie In, North Side N 3.0 12.1 115.6 90.7 7
64 8/26/24 SG Ips, West Tie In, North Side N 1.0 11.9 114.9 90.2 7
65 8/26/24 SG Ips, East Tie In, East Side N 4.0 11.7 115.4 90.6 7
66 8/26/24 SG Ips East Tie In, North Side N 1.0 12.7 114.8 90.1 7
67 8/29/24 SG Retaining Wall Foo�ng Abutment N 0.0 13.0 115.3 95.1 6
68 8/29/24 SG Retaining Wall Foo�ng Abutment N 0.0 13.2 115.7 95.5 6
69 8/30/24 SG Retaining Wall Foo�ng Abutment N 0.0 13.7 115.4 95.2 6
70 8/30/24 SG Retaining Wall Foo�ng Abutment N 0.0 13.4 115.6 95.4 6
71 9/3/24 SG Retaining Wall Foo�ng Abutment N 0.0 13.7 115.4 95.2 6
72 9/3/24 SG Retaining Wall Foo�ng Abutment N 0.0 13.3 116.1 95.8 6
73 9/6/24 SG Concrete Trough, South Side N 1.4 13.0 118.5 97.8 6
74 9/9/24 SG East Ramp Abutment Ramp N 4.0 9.6 116.6 91.5 7
75 9/9/24 SG East Ramp Abutment Ramp N 3.0 10.2 116.7 91.6 7
76 9/9/24 SG East Ramp Abutment Ramp N 2.0 9.3 115.6 90.7 7
77 9/12/24 SG East Retaining Walls N 8.0 11.6 115.1 90.3 7
78 9/12/24 SG East Retaining Walls N 6.0 10.5 115.3 90.5 7
79 9/19/24 SG Storm Drain Precast Filter Box N 6.0 11.6 113.3 91.0 3
80 9/19/24 SG Storm Drain Precast Filter Box N 4.0 11.9 112.4 90.3 3
IN-PLACE DENSITIES
Test Item2 Test3 Test Dry Relative Soil
No. Date Tested Location Method Depth Moisture Density Compaction Type
(ft) (%) (pcf) (%)
certerra.com 12130 Santa Margarita Ct, Rancho Cucamonga, CA 91730 (909) 989-1751
81 9/19/24 SG Storm Drain Precast Filter Box N 2.0 11.5 112.6 90.4 3
82 9/24/24 SG Storm Drain Precast Filter Box N 2.0 11.4 112.3 90.2 3
83 9/26/24 SG Retaining Wall N 2.0 10.9 117.0 95.7 5
84 9/26/24 SG Retaining Wall N 2.0 10.3 116.6 95.3 5
85 9/30/24 SG 24” Storm Drain S/O Ips. N 3.0 10.9 116.1 91.1 7
86 10/1/24 SG 2” Water Line N 0.0 13.0 115.1 90.3 7
87 10/1/24 SG Roadway, Main Entrance And Exit N 0.0 11.9 115.6 95.2 6
88 10/1/24 B Roadway, Main Entrance And Exit N 1.0 4.5 132.3 95.4 8
89 10/1/24 SG Roadway, Main Entrance And Exit N 0.0 9.8 116.0 95.7 6
90 10/2/24 SG Retaining Wall W/O Bridge N 6.5 11.6 116.1 95.8 6
91 10/3/24 SG Retaining Wall N 3.0 11.2 110.1 90.8 6
92 10/3/24 SG Retaining Wall N 2.0 10.9 110.3 91.0 6
93 10/4/24 SG 2 Inch Water Line Trench N 2.0 11.7 115.7 95.5 6
94 10/11/24 SG 24” Storm Drain Ips Main Yard N 6.0 12.5 114.6 94.6 6
95 10/11/24 SG 24” Storm Drain Ips Main Yard N 2.0 11.9 111.1 91.7 6
96 10/17/24 SG North Side Of Water Filter N 4.0 12.2 111.6 92.1 6
97 10/28/24 WBF Electrical Retaining Wall N 2.0 8.8 121.4 95.3 7
98 10/28/24 WBF Electrical Retaining Wall N 2.0 7.6 119.9 94.1 7
99 11/4/24 WBF Electrical Retaining Wall N 0.0 6.3 117.8 92.5 7
100 11/4/24 WBF Electrical Retaining Wall N 0.0 7.2 117.9 92.5 7
101 11/4/24 WBF Electrical Retaining Wall N 0.0 9.5 116.4 91.4 7
102 11/4/24 WBF Electrical Retaining Wall N 0.0 10.3 114.7 90.0 7
103 11/26/24 SG East Retaining Wall, Center Area. N 0.0 12.8 115.4 95.2 6
104 11/26/24 SG West Ramp, Center Area. N 2.0 11.5 121.2 95.1 7
105 11/26/24 B PCC Guter, West Side N 0.9 5.6 135.0 97.3 8
106 11/26/24 B PCC Guter, East Side. N 0.9 6.6 134.0 96.6 8
107 11/26/24 SG Ips, Electrical Trench N 0.0 4.7 124.9 98.0 7
IN-PLACE DENSITIES
Test Item2 Test3 Test Dry Relative Soil
No. Date Tested Location Method Depth Moisture Density Compaction Type
(ft) (%) (pcf) (%)
certerra.com 12130 Santa Margarita Ct, Rancho Cucamonga, CA 91730 (909) 989-1751
108 11/26/24 SG West Ramp, Center Area N 0.0 9.2 112.4 92.7 6
109 12/19/24 SG Fore-Bay Backfill N 0.0 12.9 113.8 91.4 3
110 12/19/24 SG Fore-Bay Backfill N 0.0 11.3 117.6 94.5 3
111 12/19/24 SG West Road Concrete Trench Drain N 0.7 14.5 115.8 95.5 6
112 12/28/24 SG South Road Sub-Grade N 1.3 13.6 116.4 96.0 6
113 12/28/24 WBF East Retaining Walls West Side N 2.0 15.0 115.3 95.1 6
114 1/16/25 B East Roadway, Center Sec�on N 0.5 6.2 136.0 98.1 8
115 1/16/25 B Ips Parking Lot, Center Area. N 0.3 4.8 135.1 97.4 8
116 1/16/25 SG East Roadway. North Side N 0.5 13.3 115.4 95.1 4
117 1/22/25 B Ips, West Side N 0.4 4.2 132.3 95.4 8
118 1/22/25 B East Roadway N 0.5 4.5 133.2 96.0 8
119 1/22/25 B East Retaining Wall Roadway. N 0.5 5.4 132.3 95.4 8
120 1/22/25 B East Ramp N 0.5 3.9 133.9 96.5 8
121 2/8/25 B South Roadway, Center Area N 0.0 6.4 132.3 95.4 8
122 2/8/25 B South Roadway, West Sec�on N 0.0 6.9 134.8 97.2 8
123 2/8/25 B Main Yard Patch, North Sec�on. N 0.0 7.1 132.8 95.7 8
124 2/8/25 B Main Yard Patch Work N 0.0 6.3 132.4 95.5 8
125 2/24/25 B West Roadway, West Side. N 0.3 4.1 132.1 95.2 8
126 2/24/25 B West Ramp Roadway N 0.3 6.3 132.2 95.3 8
127 2/24/25 B Debris Sor�ng Sta�on. N 0.3 5.0 132.6 95.6 8
128 2/24/25 B West Roadway, West Side N 0.3 5.2 131.9 95.1 8
129 2/25/25 SG West Roadway, South Sec�on N 0.8 14.2 118.3 97.6 8
130 2/25/25 B West Roadway, South Sec�on N 0.4 5.6 133.0 95.9 8
131 2/25/25 B West Roadway, South Sec�on N 0.4 5.9 133.3 96.1 8
132 3/17/25 B West Roadway, North Side Of DSS N 0.3 6.4 132.0 95.2 8
133 3/17/25 B West Roadway, North Side Of DSS N 0.3 6.5 133.4 96.2 8
134 3/18/25 SG Oyster Farm Entrance/Sidewalk N 0.0 8.2 125.3 90.3 8
IN-PLACE DENSITIES
Test Item2 Test3 Test Dry Relative Soil
No. Date Tested Location Method Depth Moisture Density Compaction Type
(ft) (%) (pcf) (%)
certerra.com 12130 Santa Margarita Ct, Rancho Cucamonga, CA 91730 (909) 989-1751
135 3/18/25 SG Oyster Farm Entrance/Sidewalk N 0.0 7.8 127.2 91.7 8
136 3/19/25 B Oyster Farm Sidewalk N 0.0 6.1 125.2 90.3 8
137 3/19/25 B Oyster Farm Sidewalk N 0.0 6.4 125.5 90.5 8
138 4/16/25 B Roadway Patch Area E/O Bridge. N 0.0 7.9 132.9 95.8 8
139 4/16/25 B Upper Parking Lot, Patch Area N 0.0 6.3 132.5 95.5 8
140 5/16/25 LS 24” Storm Drain, Landscape Area N 5.0 11.4 105.8 87.3 6
141 5/16/25 LS 24” Storm Drain, Landscape Area N 4.0 10.4 103.9 85.7 6
142 5/16/25 LS 24” Storm Drain, Landscape Area N 2.0 10.3 103.4 85.3 6
143 5/16/25 LS 24” Storm Drain, Landscape Area N 3.0 13.7 105.6 87.1 6
2Item Tested:
SG - Subgrade B - Base
WBF – Wall Backfill FL – Fill
EM – Electric Main
SZ – Scarified Zone
UT – Utility Trench
FG – Finish Grade LS – Landscape (85% Req)
3Test Method:
N - ASTM D6938 (Density of Soil In-Place by Direct Transmission Nuclear Method)
113
73
29
30
31
48
91
108
90
92
103
14
17
16
18
13
15
28 27
84
104
129
128
131
126
125
130 132
133
77 78
72
71
6769
138
118
12076
83
9997
98
119
100
101
102
68
70
51
46 38
42
44 35
34
66
50
43
74
75
107
63
65
117 64
60
61 57
139
58
54
52
115
59
36
65
33 56
49
41 45
53
553732
39
40 47
GG
G
2'
'
W
2'
'
W
2'
'
W
2''W
2''W
2''W 2''W
G
G
GW
GW GW
EXISTING
CDP-IPS
AREA 03
AR
E
A
0
2
Kiewit Infrastructure West Co.Carlsbad Desalination Plant
Ph 2 Intake Modifications 1
BASE MAP PROVIDED BY:
HDR THIS PLAN HAS BEEN PREPARED FOR USE AS A Utility
LOCATION MAP AND IS NOT INTENDED FOR
CONSTRUCTION.FIGURE NO.:
RMA JOB NO.:
00-230082-0
RANCHO CUCAMONGA, CA 91730
909.989.1751 · FAX 909.989.4287
12130 SANTA MARGARITA COURT
www.rmacompanies.com
*EOTECHNICAL EN*INEERIN* CONSTRUCTION INSPECTION MATERIALS TESTIN*
NAP#14
#Approximate Compaction Test Location
Not to Scale
DATE:
08/27/2025
Project Address:
4600 Carlsbad Blvd
Carlsbad, CA 92008