WHITE POINT LANDSLIDE GEOTECHNICAL INVESTIGATION November 29, 2012 Status Report

Transcription

1 Gary Lee Moore, P.E., City Engineer Vince Jones, P.E., Deputy City Engineer WHITE POINT LANDSLIDE GEOTECHNICAL INVESTIGATION November 29, 2012 Status Report

2 White Point Landslide Geotechnical Investigation November 2012 Status Report Page 2 November 29, 2012 TABLE OF CONTENTS 1.0 Background 2.0 Site Observations and Activities for the Period Ending November 29, Landslide Monitoring for the Period Ending November 29, Geotechnical Investigation Attachment 1 Status Report Prepared by Shannon & Wilson, Inc. for Period Ending September 27, 2012 White Point Landslide Investigation Attachment 2 Summary of Survey Monitoring Points White Point Landslide, prepared by the Bureau of Engineering, Period Ending September 29, 2012

3 White Point Landslide Geotechnical Investigation November 2012 Status Report Page 3 November 29, Background This Status Report provides a progress summary of the activities for the White Point Landslide project for the period ending November 29, Since the date of the last posted status report in March of 2012, the Bureau of Engineering (BOE) has continued to oversee and support the geotechnical investigation of the landslide being conducted by Shannon & Wilson, Inc., a private consulting firm. BOE has provided presentations of findings at several community meetings over this time, posted the Final Geotechnical Report for the White Point Landslide on line and has responded to comments on the report. Monthly monitoring of the landslide has continued by surveying of the established set of monitoring stations, and by readings and measurements of instrumentation in groundwater monitoring wells and borings with inclinometers. Attached to this report are the September 28, 2012 Status Report by Shannon & Wilson, Inc. (Attachment 1) and a Summary of Survey Monitoring Points by the Bureau of Engineering (Attachment 2). 2.0 Site Observations and Activities for the Period Ending November 29, 2012 Shannon & Wilson, Inc. completed geotechnical investigation of the landslide and their final report was posted to the Bureau of Engineering (BOE) White Point Landslide web site. As recommended by Shannon & Wilson, Inc., and authorized by BOE, investigative studies and geotechnical analyses have continued in order to evaluate and design stabilization improvement measures. These measures, as conceptually described in the Final Geotechnical Report of the White Point Landslide (see BOE web site) are: install a subsurface dewatering system, construct soil anchors on the beach bluff east the landslide, construct traffic control measures, and perform limited grading in the headward area of the landslide. BOE is working to implement these recommendations with an emphasis on tasks that help prepare for this winter season. An initial shape and trim phase of grading in the landslide area, designed to remove debris, improve safety of the steep slope around the edge of the landslide, and to improve drainage conditions at the head of the landslide, is near completion. Shannon & Wilson, Inc. continue with the geotechnical investigation of the landslide and have completed drilling and instrumentation in two additional borings on the east side of the landslide. Stability and hydrogeologic analyses for the de-watering project are completed. Preliminary plans and a draft geotechnical report for the de-watering system are complete and currently under review by the Bureau. Th slope anchor system stabilization improvement measure design is on-going. Interim measures to improve traffic in the area, such as re-striping the street at the corner of Paseo del Mar and Weymouth, are being implemented. 3.0 Landslide Monitoring for the Period March 29, 2012 to November 29, 2012 Survey Monitoring The BOE continues to survey the established survey monitor stations and monitor points set on the street, curb and ground around the landslide to check for evidence of ground movement which might indicate landslide movement or enlargement. No variation in the survey data has

4 White Point Landslide Geotechnical Investigation November 2012 Status Report Page 4 November 29, 2012 been noted which would indicate evidence of ground movement, with one recent exception. Survey data for Monitoring Station MS-1 located on the curb near the intersection of Paseo del Mar and Weymouth has shown five one hundredths of a foot of displacement. This detected movement is very small and several measurements over time were required for it s confirmation. A summary table of the survey monitoring is provided in Attachment 2. The survey data as of the date of this report shows no indication of surface ground movement near the landslide which might signal landslide enlargement. Instrument Monitoring Geologists from both BOE and Shannon & Wilson, Inc. continue to conduct site observation of the landslide and surrounding area. A status report prepared by Shannon & Wilson, Inc. and dated September 28, 2012 is presented in Attachment 1. As described, Shannon & Wilson, Inc. continues with the inclinometer monitoring (measurement of devices that were placed in some borings to detect ground movement) and water well readings. Subsurface movement or offset was detected in the inclinometer in boring B-7 at a depth of approximately 60 feet. As reported by Shannon & Wilson, Inc., the recent data suggests that movement of approximately 0.1 inches has occurred in the southward direction. These conclusions are preliminary and subject to change as more readings are obtained over time to verify this very small displacement amount and track any changes. Shannon & Wilson, Inc. report that readings of the installed inclinometers indicate that no measurable ground movement has occurred in the areas of the inclinometers between September 27 and October Geotechnical Investigation As noted above, the geotechnical investigation conducted by Shannon & Wilson, Inc. was completed and posted to the Bureau of Engineering (BOE) web site. Shannon & Wilson, Inc. have also completed a draft report for the design and construction of the de-watering system. The attached Status Report by Shannon & Wilson summarizes September 2012 status of some of the ongoing geotechnical studies which are part of the scope of work for stabilization improvement measures. As indicated in the report, Shannon & Wilson, Inc. have completed additional field investigation with laboratory analyses and stability analyses. Some ground cracks developed near the edge of the landslide during the interim grading project and were subsequently removed by the trim grading. Other than these ground cracks, Shannon & Wilson, Inc. report that no new significant ground cracks have been observed in the area between the fence and main landslide mass during the latest monitoring period.

5 Attachment 1 Status Report Prepared By Shannon & Wilson, Inc.

6 ALASKA CALIFORNIA COLORADO FLORIDA MISSOURI OREGON WASHINGTON September 28, 2012 Bureau of Engineering 1149 South Broadway, Suite 120 Los Angeles, California Attn: Mr. Mark Oborne RE: STATUS REPORT THROUGH 9/27/12 WHITE POINT LANDSLIDE INVESTIGATION CITY OF LOS ANGELES W.O. E , TOS SHANNON & WILSON PROJECT NO This letter provides an update to the subtask status for the period ending September 27, Shannon & Wilson is currently completing a geotechnical exploration and design program of the White Point Landslide following the landslide on November 20, We have recorded recent groundwater depths in the inclinometer borings and wells that were installed along the landslide perimeter including new borings B-10 and B-11 (Figure 1). During the most recent reporting period, the groundwater surface or piezometric surface was measured at depths ranging from approximately 22 to 101 feet below ground surface. Groundwater levels measured within the completed wells and inclinometers appear to be relatively stable with only minor fluctuations (Table 1). As discussed previously, the anomalously high groundwater level within B-1 on the west side of the site appears to have lowered to the levels measured in January of During the course of our services, we have not observed new surface cracks related to landslide movement outside of the fenced perimeter of the landslide. No new significant ground cracks have been observed in the area between the fence and main landslide mass during the latest monitoring period. Ongoing visual observation of the existing cracks adjacent to the main head scarp within the fenced-off area suggest that the material immediately adjacent to the scarp continues to move or rotate into the graben area. We expect to see periodic detachment of the scarp material throughout the upcoming winter and spring months if the corrective grading is not completed prior to the rainy season. The main landslide mass will likely move ocean-ward during and after periods of heavy precipitation. As previously reported to the Bureau of Engineering (BOE), we have detected minor subsurface movement or offset in the inclinometer in boring B-7 at a depth of approximately 60 feet. The recent data suggests that movement of approximately 0.1 inches has occurred in the direction to the south (towards the ocean slope). 664 WEST BROADWAY GLENDALE, CALIFORNIA

7 Mr. Mark Oborne City of Los Angeles September 28, 2012 Page 2 of 3 The interpretation of these data from B-7 required several readings to determine the movement amount and direction. These conclusions are preliminary and are subject to change as our studies develop. The most recent inclinometer data for the site are included in Table 2. The status of each subtask is listed below: SUBTASK STATUS Subtask Status 1. Health and Safety Plan 100% Complete 2. Geologic Mapping 75% Complete 3. Interim Grading Plan 75% Complete 4. Subsurface Exploration 100% Complete 5. Waste Handling and Management Ongoing - 20% Complete 6. Geophysical Downhole Logging 100% Complete 7. Laboratory Testing of Samples 100% Complete 8. Geologic Cross Sections Ongoing - 50% Complete 9. Stability Analysis Ongoing - 25% Complete 10. Meetings Ongoing - 10% Complete 11. Dewatering (Hydrauger) Design Ongoing - 50% Complete 12. Slope Stabilization Design Ongoing 10% Complete For this work period, tasks completed include: TASKS COMPLETED FOR THIS PERIOD Completion of borings B-10 and B-11. Meeting with Wagner Engineering for Interim Grading Plan on 8/28/12. Field Meeting with BOE and Wagner Engineering for Interim Grading Plan on 8/31/12. Initial slope stability analysis. Instrumentation reading dates shown in Tables 1 and 2. Instrumentation will be read on monthly basis for the subsequent months to monitor the landslide area for groundwater elevations and possible subsurface movement. Site observations for landslide movement during the weeks of 7/23/12 through 8/27/12. Project Team Meetings with the City of Los Angeles BOE at the downtown office, and field meetings on site L01 Rev 1/wp/d

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9 PIPE 145 AS R ASPH DIRT DIRT GNV ASPH ASPH Filename: I:\PROJECTS\10052 San Pedro Landslide\Graphics\PROPOSED BORING LOCATIONS.MXD !( Boring PIPE ASPH 138.3!. Groundwater Well!> Inclinometer PIPE LEGEND? GNV ASPH ASPH Nike Missile Base ROCKS ASPH Silo Silo? Qsf 7.2 Head Scarp GNV GNV B-1!> DIRT PIPE 41.0 PIPE ROCKS DIRT 82.7 PIPES ASPH ASPH DIRT 64.7 DIRT PIPES ASPH PIPES GNV PIPES GNV VC R VC UB VC VC VC VC VC DI ROCKS B-2 B-5!( inch = 100 feet B-9!>!> Feet GNV B-6! B !( Perimeter Hiking Trail B-3!. ASPH B ROCKS B-8!. 5.5 DIRT B-10 Paseo Del Mar!>!> 6.2 B-11 PIPES !> 6.4 TREES R AT5 ASPH Weymouth Ave TREES PIPE TREES ASPH White Point Landslide San Pedro District Los Angeles, California ³ VC SITE AND EXPLORATION PLAN September FIG. 1 N 1,718,800 N 1,71 PASEO DEL MAR LANDSLIDE Photo Date: Contour Interval=.5 Ft. Map Scale: 1" - 40' prepared by gital Maps, Inc

10 White Point Landslide City of Los Angeles Table 1 Groundwater Data Shannon & Wilson, Inc. Well/ VWP Reading Date B-1 B-3 Elev ft. Elev ft. Elev ft. Screened Elev. = to B-5 B-6 B-7 B-8 B-9 Elev ft. Elev ft. Elev ft. Elev ft. Screened Elev. = to Screened Elev. = to VWP Elev. = 1.8 VWP Elev. = VWP Elev. = 6.41 VWP Elev. = VWP Elev. = 7.31 VWP Elev. = VWP Elev. = VWP Elev. = Depth 1 Depth 2 Depth 1 Depth 2 Depth 1 Depth 2 Depth 1 Depth 1 VWP Elev. = Depth 1 VWP Elev. = VWP Elev. = VWP Elev. = VWP Elev. = Depth 1 Depth 1 Depth 1 Depth 1 1/11/ /21/ /29/ (3) /2/ /8/ (3) /16/ (3) /30/ /4/ /11/ /18/ /25/ /27/ /22/ /23/ /28/ /27/ /24/ /27/ /27/ B-10 Elev ft. B-11 Elev ft. Notes: 1. Measured using vibrating wire piezometer (VWP). 2. Measured using electronic well sounder between 12/8/11 and 6/27/12 and VWP thereafter. 3. Measured during drilling. 10/16/2012, GW and Inclinometer Tables.xlsx, JXM Page 1 of

11 White Point Landslide City of Los Angeles Inclinometer Reading Date Table 2 Inclinometer Data Cumulative Displacement(in.) B-1 B-5 B-7 B-9 B-10 B-11 12/28/2011 Baseline Baseline Baseline Baseline 1/4/2012 <0.1 <0.1 <0.1 <0.1 1/11/2012 <0.1 <0.1 <0.1 <0.1 1/18/2012 <0.1 <0.1 <0.1 <0.1 1/25/2012 <0.1 <0.1 <0.1 <0.1 2/27/2012 <0.1 <0.1 <0.1 <0.1 3/2/2012 <0.1 <0.1 <0.1 <0.1 4/23/2012 <0.1 <0.1 <0.1 <0.1 5/28/2012 <0.1 <0.1 <0.1 <0.1 6/27/2012 <0.1 <0.1 <0.1 <0.1 7/24/2012 <0.1 <0.1 <0.1 <0.1 8/14/ Baseline Baseline 8/22/ <0.1 <0.1 8/27/2012 <0.1 < <0.1 <0.1 <0.1 9/7/ <0.1 <0.1 9/28/2012 <0.1 < <0.1 <0.1 <0.1 Shannon Wilson, Inc. Notes: 1. Measured using inclinometer. Baseline: Three series of measurements to determine starting point used for comparisons. 10/16/2012, GW and Inclinometer Tables.xlsx, JXM Page 1 of

12 Attachment 2 Summary of Survey Monitoring Points

13 WHITE POINT SLIDE MONITORING STATIONS REPORT FIGURE 2 CITY OF LOS ANGELES DEPARTMENT OF PUBLIC WORKS BUREAU OF ENGINEERING Monitoring Station Reference Position Date Offset Station Northing Easting MS1 O\S= L31.428' STA= ' N= ' E= ' EL= ' MS2 O\S= L30.113' STA= ' N= ' E= ' EL= ' 01/26/ ' 0.001' 0.002' 0.000' 0.000' 02/09/ ' ' 0.001' 0.001' 0.003' 02/16/ ' ' ' 0.005' 0.001' 02/23/ ' ' ' 0.001' 0.007' 02/29/ ' ' ' 0.001' 0.011' 03/09/ ' 0.001' ' ' 0.007' 03/21/ ' ' ' 0.004' 0.011' 04/27/ ' ' ' 0.007' 0.004' 05/24/ ' ' ' ' ' 06/21/ ' 0.001' ' ' ' 07/31/ ' ' ' 0.010' ' 08/31/ ' ' ' 0.000' ' 09/27/ ' 0.002' ' ' ' 01/26/ ' ' 0.001' 0.004' 0.002' 02/09/ ' 0.001' 0.005' 0.001' ' 02/16/ ' ' 0.004' 0.002' ' 02/23/ ' ' 0.001' 0.002' ' 02/29/ ' ' ' 0.004' ' 03/09/ ' 0.001' 0.005' 0.000' 0.001' 03/21/ ' 0.003' 0.004' ' ' 04/27/ ' ' 0.002' 0.011' 0.002' 05/24/ ' 0.005' 0.004' ' ' 06/21/ ' 0.002' 0.002' ' 0.001' 07/31/ ' 0.003' 0.002' ' ' 08/31/ ' 0.003' ' ' 0.006' 09/27/ ' 0.007' 0.000' ' 0.004'

14 Monitoring Station Reference Position Date Offset Station Northing Easting MS3 O\S= L28.890' STA= N= ' E= ' EL= ' MS4 O\S= R ' STA= ' N= ' E= ' EL= ' MS5 O\S= R ' STA= ' N= ' E= ' EL= ' 01/26/ ' 0.002' 0.000' ' ' 02/09/ ' ' 0.000' 0.003' ' 02/16/ ' 0.003' 0.000' ' 0.002' 02/23/ ' ' 0.001' 0.003' ' 02/29/ ' 0.005' 0.003' ' ' 03/09/ ' ' 0.002' 0.001' 0.002' 03/21/ ' 0.005' 0.002' ' 0.002' 04/27/ ' 0.003' 0.005' ' ' 05/24/ ' ' 0.003' 0.007' ' 06/21/ ' 0.000' 0.005' 0.001' 0.001' 07/31/ ' ' 0.004' 0.004' ' 08/31/ ' 0.006' 0.006' ' 0.002' 09/27/ ' 0.001' 0.008' 0.001' ' 01/26/ ' ' 0.000' 0.010' ' 02/09/ ' 0.016' ' ' ' 02/16/ ' 0.016' ' ' ' 02/23/ ' 0.000' ' 0.000' ' 02/29/ ' 0.013' 0.015' ' 0.005' 03/09/ ' 0.003' ' ' 0.008' 03/21/ ' ' ' ' ' 04/27/ ' 0.003' ' ' ' 05/24/ ' ' ' 0.008' ' 06/21/ ' ' ' 0.016' ' 07/31/ ' ' ' 0.009' 0.010' 08/31/ ' ' ' 0.020' 0.011' 09/27/ ' ' ' 0.019' ' 01/26/ ' ' 0.002' 0.022' 0.014' 02/09/ ' 0.016' ' ' ' 02/16/ ' 0.013' ' ' 0.019' 02/23/ ' 0.008' ' ' 0.007' 02/29/ ' 0.010' ' ' 0.009' 03/09/ ' ' ' 0.003' 0.014' 03/21/ ' ' ' 0.014' 0.004' 04/27/ ' ' ' 0.008' 0.002' 05/24/ ' ' ' 0.012' ' 06/21/ ' ' ' 0.011' ' 07/31/ ' ' ' 0.020' ' 08/31/ ' ' ' 0.011' 0.005' 09/27/ ' ' ' 0.011' '

15 Monitoring Station Reference Position Date Offset Station Northing Easting MS6 O\S= L25.617' STA= ' N= ' E= ' EL= ' MS7 O\S= L25.719' STA= ' N= ' E= ' EL= ' MS8 O\S= L25.063' STA= ' N= ' E= ' EL= ' 01/26/ ' 0.003' 0.002' ' 0.000' 02/09/ ' ' ' 0.007' 0.001' 02/16/ ' 0.002' 0.004' ' 0.001' 02/23/ ' 0.000' ' ' ' 02/29/ ' 0.002' 0.003' ' 0.004' 03/09/ ' 0.002' 0.004' ' 0.004' 03/21/ ' 0.001' 0.001' ' 0.002' 04/27/ ' 0.003' 0.010' 0.000' 0.001' 05/24/ ' 0.002' ' ' 0.002' 06/21/ ' ' ' 0.007' 0.004' 07/31/ ' 0.002' ' ' 0.000' 08/31/ ' ' ' 0.007' 0.007' 09/27/ ' 0.003' 0.005' ' 0.007' 01/26/ ' 0.007' 0.008' ' ' 02/09/ ' 0.007' ' ' 0.002' 02/16/ ' 0.007' 0.001' ' ' 02/23/ ' 0.007' ' ' ' 02/29/ ' 0.018' 0.015' ' ' 03/09/ ' ' 0.014' 0.007' 0.000' 03/21/ ' 0.008' 0.006' ' ' 04/27/ ' 0.018' 0.005' ' ' 05/24/ ' 0.007' ' ' 0.001' 06/21/ ' 0.007' ' ' ' 07/31/ ' 0.007' ' ' ' 08/31/ ' 0.008' 0.003' ' 0.003' 09/27/ ' 0.007' ' ' 0.006' 01/26/ ' 0.000' 0.003' 0.001' 0.000' 02/09/ ' ' ' 0.004' 0.005' 02/16/ ' 0.005' 0.001' ' 0.002' 02/23/ ' 0.003' 0.004' ' ' 02/29/ ' 0.011' 0.013' ' 0.002' 03/09/ ' 0.002' 0.007' 0.000' 0.003' 03/21/ ' 0.003' 0.008' ' 0.002' 04/27/ ' 0.013' 0.005' ' 0.001' 05/24/ ' 0.002' ' ' 0.004' 06/21/ ' 0.011' 0.001' ' ' 07/31/ ' 0.002' ' ' ' 08/31/ ' 0.003' ' ' ' 09/27/ ' 0.002' ' ' '

16 Monitoring Station Reference Position Date Offset Station Northing Easting MS9 O\S= R2.519' STA= ' N= ' E= ' EL= ' MS10 O\S= R45.174' STA= ' N= ' E= ' EL= ' MS11 O\S= R95.696' STA= ' N= ' E= ' EL= ' 01/26/ ' ' 0.000' 0.003' 0.001' 02/09/ ' 0.011' ' ' 0.011' 02/16/ ' 0.011' ' ' 0.000' 02/23/ ' 0.011' 0.003' ' ' 02/29/ ' 0.029' 0.018' ' 0.005' 03/09/ ' 0.008' 0.016' ' 0.008' 03/21/ ' 0.010' 0.006' ' 0.000' 04/27/ ' 0.010' 0.003' ' 0.007' 05/24/ ' 0.001' ' ' 0.006' 06/21/ ' 0.009' ' ' 0.008' 07/31/ ' 0.009' ' ' 0.005' 08/31/ ' 0.011' 0.000' ' 0.002' 09/27/ ' 0.000' ' 0.001' 0.004' 01/26/ ' 0.005' 0.003' ' 0.002' 02/09/ ' ' ' 0.005' 0.006' 02/16/ ' 0.004' 0.001' ' ' 02/23/ ' ' ' 0.013' 0.003' 02/29/ ' 0.015' ' ' 0.007' 03/09/ ' ' ' 0.012' 0.005' 03/21/ ' 0.005' ' ' ' 04/27/ ' 0.000' ' ' 0.002' 05/24/ ' ' ' 0.016' 0.004' 06/21/ ' ' ' 0.007' 0.001' 07/31/ ' ' ' 0.006' 0.000' 08/31/ ' ' ' 0.004' ' 09/27/ ' ' ' 0.018' ' 01/26/ ' ' 0.007' 0.012' ' 02/09/ ' ' 0.008' 0.006' 0.006' 02/16/ ' 0.019' 0.008' ' ' 02/23/ ' ' ' 0.011' 0.000' 02/29/ ' ' 0.008' 0.004' 0.004' 03/09/ ' ' 0.003' 0.011' ' 03/21/ ' 0.002' 0.002' ' 0.001' 04/27/ ' 0.003' 0.008' 0.000' 0.004' 05/24/ ' ' ' 0.000' 0.001' 06/21/ ' 0.003' 0.005' ' 0.009' 07/31/ ' 0.013' 0.012' ' 0.001' 08/31/ ' 0.011' 0.008' ' 0.004' 09/27/ ' 0.012' 0.011' ' '

17 Monitoring Station Reference Position Date Offset Station Northing Easting MS12 O\S= R ' STA= ' N= ' E= ' EL= ' MS13 O\S= R ' STA= ' N= ' E= ' EL= ' MS14 O\S= R ' STA= ' N= ' E= ' EL= ' 01/26/ ' ' ' 0.003' ' 02/09/ ' ' 0.003' 0.014' ' 02/16/ ' 0.009' 0.009' ' ' 02/23/ ' ' ' 0.013' ' 02/29/ ' ' 0.003' 0.005' 0.006' 03/09/ ' ' ' 0.007' 0.000' 03/21/ ' ' ' 0.010' 0.003' 04/27/ ' 0.005' ' ' 0.000' 05/24/ ' ' ' 0.014' ' 06/21/ ' 0.001' 0.001' ' 0.005' 07/31/ ' 0.001' 0.001' ' 0.002' 08/31/ ' ' 0.000' 0.001' 0.008' 09/27/ ' 0.006' 0.009' ' ' 01/26/ ' 0.000' ' ' ' 02/09/ ' 0.005' ' ' ' 02/16/ ' ' ' 0.001' 0.006' 02/23/ ' ' ' 0.000' 0.005' 02/29/ ' ' ' 0.007' ' 03/09/ ' 0.011' 0.004' ' 0.005' 03/21/ ' 0.000' ' ' 0.006' 04/27/ ' 0.001' ' ' 0.009' 05/24/ ' ' ' ' 0.004' 06/21/ ' ' ' 0.013' ' 07/31/ ' ' ' 0.020' ' 08/31/ ' ' ' 0.010' 0.001' 09/27/ ' ' ' 0.015' ' 01/26/ ' 0.002' 0.008' 0.003' ' 02/09/ ' ' ' ' ' 02/16/ ' 0.002' ' ' 0.005' 02/23/ ' 0.004' ' ' 0.010' 02/29/ ' 0.008' 0.007' ' 0.004' 03/09/ ' 0.010' 0.000' ' 0.010' 03/21/ ' 0.000' ' 0.003' 0.003' 04/27/ ' ' ' 0.004' 0.014' 05/24/ ' ' ' 0.012' 0.003' 06/21/ ' ' ' 0.019' 0.002' 07/31/ ' ' ' 0.013' ' 08/31/ ' ' ' 0.013' ' 09/27/ ' ' ' 0.020' 0.005'

18 Monitoring Station Reference Position Date Offset Station Northing Easting MS15 O\S= R ' STA= ' N= ' E= ' EL= ' MS16 O\S= R ' STA= ' N= ' E= ' EL= ' MS17 O\S= R ' STA= ' N= ' E= ' EL= ' 01/26/ ' ' ' 0.007' ' 02/09/ ' ' ' 0.000' ' 02/16/ ' 0.001' ' ' 0.010' 02/23/ ' ' 0.001' 0.003' 0.009' 02/29/ ' ' 0.010' 0.007' 0.002' 03/09/ ' 0.006' 0.004' ' 0.014' 03/21/ ' 0.001' ' ' 0.010' 04/27/ ' ' ' 0.004' 0.012' 05/24/ ' 0.003' ' ' 0.009' 06/21/ ' 0.004' ' ' 0.004' 07/31/ ' 0.003' ' ' 0.004' 08/31/ ' ' 0.018' 0.009' 0.010' 09/27/ ' 0.000' 0.002' 0.001' 0.003' 01/26/ ' ' ' 0.003' ' 02/09/ ' 0.000' 0.012' 0.003' ' 02/16/ ' 0.002' 0.006' 0.000' 0.004' 02/23/ ' ' 0.006' 0.005' 0.004' 02/29/ ' ' 0.011' 0.009' 0.002' 03/09/ ' ' 0.012' 0.006' 0.005' 03/21/ ' 0.000' 0.010' 0.003' 0.004' 04/27/ ' ' 0.011' 0.008' 0.009' 05/24/ ' ' 0.008' 0.008' ' 06/21/ ' ' 0.008' 0.004' 0.001' 07/31/ ' 0.004' ' ' 0.006' 08/31/ ' ' ' 0.028' 0.009' 09/27/ ' ' 0.004' 0.003' ' 01/26/ ' ' ' 0.003' ' 02/09/ ' ' ' 0.012' ' 02/16/ ' ' ' 0.003' 0.001' 02/23/ ' 0.010' 0.002' ' 0.019' 02/29/ ' ' ' 0.000' 0.005' 03/09/ ' 0.004' ' ' 0.005' 03/21/ ' 0.000' ' ' 0.005' 04/27/ ' ' ' 0.001' ' 05/24/ ' ' 0.000' 0.002' ' 06/21/ ' ' ' 0.001' 0.004' 07/31/ ' ' 0.005' 0.004' 0.008' 08/31/ ' ' ' 0.020' 0.008' 09/27/ ' ' 0.002' 0.003' '

19 Monitoring Station Reference Position Date Offset Station Northing Easting MS18 O\S= R ' STA= ' N= ' E= ' EL= ' MS19 O\S= R74.056' STA= ' N= ' E= ' EL= ' MS20 O\S= R ' STA= ' N= ' E= ' EL= ' 01/26/ ' ' ' 0.008' ' 02/09/ ' ' ' 0.021' ' 02/16/ ' 0.003' ' ' 0.002' 02/23/ ' 0.004' 0.010' ' 0.015' 02/29/ ' ' 0.005' 0.005' 0.000' 03/09/ ' 0.004' 0.008' ' 0.001' 03/21/ ' 0.000' 0.002' 0.001' 0.010' 04/27/ ' ' ' 0.001' 0.009' 05/24/ ' 0.001' 0.003' 0.000' 0.004' 06/21/ ' ' ' 0.001' 0.002' 07/31/ ' 0.001' ' ' 0.002' 08/31/ ' ' ' 0.028' 0.010' 09/27/ ' ' ' 0.000' 0.000' 01/26/ ' ' ' 0.012' ' 02/09/ ' ' ' 0.016' ' 02/16/ ' 0.004' ' ' 0.003' 02/23/ ' 0.029' ' ' 0.003' 02/29/ ' ' 0.005' 0.018' 0.006' 03/09/ ' 0.003' 0.012' 0.001' 0.007' 03/21/ ' 0.001' ' ' 0.005' 04/27/ ' 0.001' ' ' 0.005' 05/24/ ' ' 0.008' 0.005' 0.005' 06/21/ ' ' ' 0.000' 0.002' 07/31/ ' 0.000' 0.005' 0.002' 0.009' 08/31/ ' ' ' 0.030' 0.006' 09/27/ ' ' 0.000' 0.029' ' 01/26/ ' ' ' 0.004' ' 02/09/ ' 0.009' 0.006' ' ' 02/16/ ' 0.002' ' ' 0.007' 02/23/ ' ' ' 0.002' ' 02/29/ ' 0.004' 0.008' 0.001' 0.003' 03/09/ ' ' 0.004' 0.011' ' 03/21/ ' 0.012' 0.001' ' 0.003' 04/27/ ' ' 0.000' 0.021' 0.006' 05/24/ ' ' ' 0.020' 0.005' 06/21/ ' ' ' 0.020' ' 07/31/ ' ' ' 0.010' ' 08/31/ ' ' ' 0.020' ' 09/27/ ' ' 0.004' 0.021' '

20 Monitoring Station Reference Position Date Offset Station Northing Easting MS21 O\S= R ' STA= ' N= ' E= ' EL= ' MS22 O\S= R ' STA= ' N= ' E= ' EL= ' MS23 O\S= R ' STA= ' N= ' E= ' EL= ' 01/26/ ' 0.005' 0.005' ' ' 02/09/ ' 0.004' 0.019' 0.000' ' 02/16/ ' 0.001' 0.014' 0.002' ' 02/23/ ' ' 0.000' 0.000' 0.000' 02/29/ ' 0.010' ' ' 0.000' 03/09/ ' 0.012' 0.002' ' 0.006' 03/21/ ' 0.002' ' ' 0.009' 04/27/ ' ' ' 0.017' 0.002' 05/24/ ' ' 0.002' 0.016' 0.003' 06/21/ ' ' ' 0.000' 0.000' 07/31/ ' 0.000' 0.000' ' 0.001' 08/31/ ' ' 0.002' 0.006' ' 09/27/ ' ' 0.002' 0.007' ' 01/26/ ' 0.008' ' ' ' 02/09/ ' 0.005' 0.018' ' ' 02/16/ ' 0.005' 0.014' ' ' 02/23/ ' 0.010' 0.008' ' 0.000' 02/29/ ' 0.005' ' ' 0.000' 03/09/ ' ' 0.005' 0.010' 0.001' 03/21/ ' 0.002' 0.003' ' 0.012' 04/27/ ' ' 0.008' 0.020' ' 05/24/ ' ' 0.000' 0.010' 0.005' 06/21/ ' ' 0.000' 0.003' ' 07/31/ ' ' 0.004' 0.012' ' 08/31/ ' ' ' 0.024' ' 09/27/ ' ' 0.008' 0.020' ' 01/26/ ' ' ' 0.015' ' 02/09/ ' 0.013' 0.009' ' ' 02/16/ ' ' 0.014' 0.024' 0.003' 02/23/ ' ' 0.012' 0.007' 0.003' 02/29/ ' ' 0.003' 0.014' 0.001' 03/09/ ' ' ' 0.004' 0.006' 03/21/ ' 0.001' 0.003' 0.000' 0.007' 04/27/ ' ' ' 0.005' 0.006' 05/24/ ' ' 0.002' 0.012' 0.002' 06/21/ ' ' 0.008' 0.016' 0.003' 07/31/ ' ' ' 0.008' 0.003' 08/31/ ' ' ' 0.005' ' 09/27/ ' ' 0.006' 0.024' 0.004'

21 Monitoring Station Reference Position Date Offset Station Northing Easting MS24 O\S= R83.317' STA= ' N= ' E= ' EL= ' MS25 O\S= R31.427' STA= ' N= ' E= ' EL= ' MS26 O\S= L8.070' STA= ' N= ' E= ' EL= ' 01/26/ ' ' ' 0.001' 0.006' 02/09/ ' ' ' ' ' 02/16/ ' 0.008' 0.015' ' 0.006' 02/23/ ' 0.010' 0.020' ' ' 02/29/ ' ' ' 0.008' 0.007' 03/09/ ' 0.007' 0.007' ' 0.007' 03/21/ ' ' ' 0.000' 0.002' 04/27/ ' ' ' 0.001' 0.005' 05/24/ ' ' 0.005' 0.006' ' 06/21/ ' ' 0.000' 0.005' ' 07/31/ ' 0.008' 0.000' ' ' 08/31/ ' ' ' 0.020' 0.002' 09/27/ ' 0.006' 0.007' ' 0.003' 01/26/ ' 0.006' ' ' ' 02/09/ ' ' ' ' ' 02/16/ ' ' 0.005' 0.005' ' 02/23/ ' ' ' 0.018' 0.007' 02/29/ ' ' ' 0.024' 0.006' 03/09/ ' 0.001' 0.008' 0.001' ' 03/21/ ' 0.010' 0.002' ' 0.005' 04/27/ ' ' ' 0.036' 0.003' 05/24/ ' ' ' 0.006' 0.002' 06/21/ ' 0.006' ' ' ' 07/31/ ' 0.014' ' ' ' 08/31/ ' ' ' 0.007' ' 09/27/ ' ' ' 0.025' ' 01/26/ ' 0.000' ' ' ' 02/09/ ' 0.001' ' ' ' 02/16/ ' 0.006' 0.013' ' 0.009' 02/23/ ' ' ' 0.027' ' 02/29/ ' ' ' 0.012' 0.014' 03/09/ ' 0.003' 0.012' 0.001' 0.007' 03/21/ ' ' ' 0.007' 0.006' 04/27/ ' ' 0.000' 0.008' ' 05/24/ ' ' ' 0.007' 0.005' 06/21/ ' 0.000' ' 0.000' 0.005' 07/31/ ' ' 0.004' 0.008' 0.006' 08/31/ ' ' ' 0.034' 0.013' 09/27/ ' ' ' 0.023' 0.004'

22 Control Points Pt # Northing Easting CP 1 CP 2 CP 6 CP 7 CP

23