08 ElecRestGPRSurvey20200618.pdf

Carlsbad Caverns National Park Electrical Resistivity and Ground Penetrating Radar Survey National Park Service

Project Location: Eddy County, NM June 18, 2020

Carlsbad Caverns National Park Electrical Resistivity and Ground Penetrating Radar Survey National Park Service

June 18, 2020 | i

Contents

1 Introduction

1.1 Project Overview

1.2 Purpose and Scope

2 Fieldwork Methodology

2.1 Electrical Resistivity Tomography

2.2 Ground Penetrating Radar

2.3 RD8000 Locator

2.4 Global Positioning System

3 Summary of Field Activities and Site Conditions

3.1 Field Activities

3.2 Site Conditions

4 Data Results

4.1 ER Results

4.2 GPR Results

4.3 Utility Survey Results

5 Conditions and Limitations

Figures

ER and GPR Line Locations with Interpreted Voids.....................................................................Appendix A ER Data and Interpretations .........................................................................................................Appendix B GPR Data and Interpretations ......................................................................................................Appendix C Utility Mapping Results.................................................................................................................Appendix D ii | June 18, 2020

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hdrinc.com

1670 Broadway, Suite 3400, Denver, CO 80222 T (303) 764-1520 F (303) 860-7139

June 18, 2020

Paula Aldridge, Project Manager National Park Service, Denver Service Center 12795 W Alameda Pkwy Lakewood, CO 80225

SUBJECT: CAVE 169636 Carlsbad Cavern National Park, Replace Primary Electrical, Geophysical Survey Report - Final

Dear Ms. Aldridge

This report is provided to present the finding of the geophysical survey of the proposed alignment for replacement of the primary electrical system. All field surveys, investigations and analysis of the resulting data have been completed. The field work included:

establishing survey coordinate control of the information based on the available control monuments within the Park tied in with Global Positioning System (GPS), locating and determining the coordinates of the existing utilities within a 30 foot corridor of the proposed electrical alignment, geophysical survey of the proposed alignment utilizing Electrical Resistivity Tomography (ER) to detect potential voids or other anomalies, geophysical survey of the proposed alignment utilizing Ground Penetrating Radar (GPR) to detect potential voids or other anomalies where ER was not possible due to interferences.

Preliminary results were presented to the NPS for concurrence on potential areas of concern.

Additional ER and GPR surveys were performed in the areas of concern to better inform decisions on the alignment of the primary electrical alignment.

The collected data was reduced and analyzed using various computer programs. The results of that analysis are presented as both a written summary and graphical images in this report. The graphical information has been normalized with topographical variations to improve the clarity of the information presented.

If you have any questions or comments after reading this report please let me know.

Sincerely, Glen Adams, PG, RG, PGp Paul Davila, PE, LEED AP Senior Geophysicist Task Order Manager cc: File Kent Brogger, HDR

June 18, 2020 | 1

1 Introduction

1.1 Project Overview

HDR Engineering, Inc. (HDR) was contracted by the National Park Service to perform electrical resistivity (ER) tomography, ground penetrating radar (GPR), and utility locating surveys for the purpose of detecting possible voids existing within the subsurface along the route of the proposed electrical duct bank alignment and identifying conflicting utilities.

The survey area included the electrical substation access, portions of the Visitor’s Center parking lot and areas around park offices and residential buildings. Utilities within an approximately 30-foot wide corridor of the proposed electrical duct bank alignment were surveyed to aid in the ER and GPR interpretations as well as to provide utility information for the electrical system design and construction. This report contains an overview of field collection activities, data processing, and interpretation of the ER and GPR survey data and utility mapping results for the aforementioned project. The goal of this report is to provide a summary of the data collection and present the interpreted results of the geophysical surveys.

1.2 Purpose and Scope

The overall purpose of the geophysical investigation was split into two parts. The first was to detect the presence of shallow subsurface voids in the limestone within the path of the electric line. The focus of the void detection survey was the top 15 to 50 feet of the subsurface. The second was to identify and map the location of the existing utilities (electrical, telecom, fiber optic, water, and sewer) within the proposed electrical duct bank alignment.

2 Fieldwork Methodology For the identification and delineation of subsurface voids at the geophysical survey locations, the following technologies were used:

Ground Penetrating Radar;

Electrical Resistivity Tomography; and Global Positioning System.

For the identification and delineation of the existing utilities, the following technologies were used:

RD8000 Locator Ground Penetrating Radar

The paragraphs below provide a detailed description of each survey technology.

2 | June 18, 2020

2.1 Electrical Resistivity Tomography

In sections of the proposed electric duct bank alignment that were not parallel to existing utilities, ER was used to detect subsurface voids. With this technique, the apparent electrical resistivity distribution of the subsurface is measured using multiple arrays of four electrodes. By injecting a direct current (DC) or very low frequency alternating current (AC) intensity (I) between a pair of electrodes and measuring the resulting potential difference (∆V) with a second pair of electrodes, it is possible to calculate the apparent resistivity (R) of the subsurface using a derivation of Ohm’s law (R=∆V/I). The approximate depth of this measurement is proportional to the unit spacing between the electrodes, and therefore, by increasing the separation of the electrodes, readings can be recorded from greater depths. Using large arrays of numerous electrodes, deployed in line and connected via multi-core cables, the measurement system then runs a series of commands that automatically selects various different combinations of electrodes, eventually creating a pseudo-section of apparent resistivity values for the subsurface beneath the electrode array.

It should be appreciated that the data recorded are ‘apparent’ resistivity values, and not the ‘true’ subsurface resistivity values. This is because the recorded values are a function of all parts of the subsurface that the current has traveled through between electrodes.

Conversion of the ‘apparent’ resistivity values to ‘true’ resistivity values is performed via an inversion process, which generates a model with a similar theoretical ‘apparent’ resistivity distribution to that of the field data. It must be noted that this process is non-unique; a given apparent resistivity data set might be accounted for by many different models. Therefore, inversion process is constrained using available intrusive site investigation data, so as to produce the most realistic geological model.

For this investigation, an AGI Supersting, 8-channel resistivity meter, with an array of 56 electrodes was used. Using unit electrode spacing of 10 feet and a combined dipole-dipole and inverse Schlumberger array, data was collected down to a minimum depth of 60 feet (this combined array takes advantage of the preferred lateral resolution provided by the dipole-dipole array and the vertical resolution provided by the inverse Schlumberger array).

It was assumed that the underlying bedrock has relatively uniform resistivity, with potential void features manifesting a regions of anomalous data (high for air-filled voids, low for sediment or water-filled karsts).

2.2 Ground Penetrating Radar

GPR was one of the geophysical methods used to help identify possible voids within the subsurface. This nondestructive method uses electromagnetic radiation in the microwave band (UHF/VHF radio frequencies). It detects reflected signals from subsurface interfaces and structures. GPR can be used in a variety of media, including rock, soil, ice, fresh water, pavements and structures. It can detect objects, changes in material, and conditions such as voids and cracks. GPR transmits high-frequency polarized radio waves into the ground. When the transmitted wave encounters a buried object, or a boundary with contrasting dielectric constants, the receiving antenna records a reflection and shows variations in the return signal. The GPR was utilized on this project along the proposed excavation route to identify anomalous areas. By the amplitude and general response of the instrument anomalies that could be voids were identified.

June 18, 2020 | 3

The depth range of the GPR is limited by the electrical conductivity of the ground and the transmitted center frequency of the antenna. As conductivity increases, the penetration depth decreases. Higher frequencies do not penetrate as far as lower frequencies, but give better resolution. Good penetration is also achieved in dry sandy soils, or massive and dry materials, such as granite, limestone, and concrete. The depth of penetration for a typical survey is usually between 10 and 15 feet. In moist and/or clay-laden soils and soils with high electrical conductivity, penetration is much less (sometimes only a few inches). The GPR data coverage is a single profile below each line with a very narrow width, considered to be just looks immediately below the survey path. Since in most areas two GPR profiles were collected and about two feet apart, the GPR coverage can be considered to be an approximately two-foot wide path where collected.

The physical GPR unit is a 3.0’x3.0’x1.5’ box that is mounted on a 4-wheel cart near the ground surface. The controller is a small handheld tablet that is used to control the collection and view the GPR data as it is collected. When operating the GPR, the unit must slide smoothly along the ground surface. The cart has the capability to float up and over small obstacles like rocks and tree roots, but larger obstacles may affect the data recorded or cause interference in the GPR signal.

2.3 RD8000 Locator

The RD8000 Locator (RD) has many different functions to identify and locate various utilities. The RD800 has a passive operation mode that detects the 60Hz frequency on active electric lines. Telecom, water, sewer and fiber optic lines required direct coupling to the utility or tracer wire to induce a known frequency with a low wattage transmitter and utilizing the RD800 Receiver to map the utility within the proposed electric corridor.

2.4 Global Positioning System

The global positioning system (GPS) used for this project was a Trimble Catalyst Global Navigation Satellite System (GNSS) mounted on s standard 6-foot survey pole. Positional accuracy is typically within 4 inches. The starting and ending stations (at a minimum) were recorded for both the GPR and ER survey line locations. For ER lines that crossed the more rugged terrain with changes in elevation were surveyed at more frequent stationing to help provide elevations along the line for data processing. The utilities traced and marked on the ground surface were also recorded during the GPS surveying. Several survey monuments were also surveyed and are included on site maps presented in Appendix A. and in the table below:

4 | June 18, 2020

Table 1: Coordinates of site control points, expressed in northings and eastings, New Mexico State Plane East, NAD27, US Survey Feet.

Point Name Northing (ft) Easting (ft) Elevation (ft) A-19 428028.06 466081.78 4396.84

PA-2839 427159.55 465414.42 4409.01

PA-3009 427354.77 465453.48 4408.84

PA-3339 427295.26 465197.23 4421.65

PA-6754 428589.05 466356.77 4441.01

PA-9713 428516.68 466006.43 4448.78

3 Summary of Field Activities and Site Conditions

3.1 Field Activities

A 2-person crew was mobilized to Carlsbad Caverns National Park and conducted field data collection from May 12th through 21st, 2020. The proposed electric duct bank alignment was walked by HDR and NPS personnel and flagging was placed at specific crossing points to minimize damage to historic features and mark selected alignment locations. As-built utility drawings were used to inform the GPR and ER survey layouts along the proposed electrical duct bank alignment. ER profile sections were collected in areas where no parallel utilities were expected within 50-feet of the ER profile. ER profiles were collected using a 5 to 10-foot electrode spacing in 28, 42 and 56 electrode profiles;

19 ER profiles were collected, totaling 5,300 linear feet. GPR transects were collected along the proposed electric line corridor in areas that contained utilities that would affect the ER data collection. GPR transects were collected using a GSSI 200-megahertz (MHz) hyper-staking antenna. The GPR antenna was deployed on small wheels that made it ideal for collection on hard surfaces. Due to the ease of GPR transect data collection in paved areas, GPR was also collected along ER profiles in the Visitor’s Center parking lot and along Reef Top Circle. GPS data was collected at each start and end points from the ER profiles and GPR transects. If the ER profile had significant elevation relief, then additional GPS positions were collected along the profile. Utilities mapped within the proposed electrical duct bank alignment were also recorded with the GPS. Appendix A contains sheets showing the route of the proposed electric duct bank alignment (approximate location, design in progress) and the geophysical ER profiles and GPR transect locations.

Also included on these figures are the interpreted primary voids. Primary voids are anomalies within the ER and GPR data that have both high amplitude responses and are of a larger size and within the top 10 to 15 feet from the ground surface. Other anomalies and potential deeper voids are included in the interpretations shown in Appendices B and C.

June 18, 2020 | 5

3.2 Site Conditions

Carlsbad Caverns National Park is located within the northern portion of the Chihuahuan Desert, and is bordered by the Guadalupe Mountains. The subsurface generally consists of limestone deposited around 265 million years ago as a reef near the shore of an inland sea. Within the last 10-15 million years, sulfuric acid has dissolved portions of the fossilized reef to create voids or in many cases large caves within the limestone.

The survey area was in the general vicinity of the park Visitor’s Center, offices, residential buildings, and maintenance shops. Areas that contained dense vegetation and terrain were surveyed primarily using the ER method; these areas are indicated on sheets in Appendix A. ER survey areas were focused on the following alignments: Electric Substation to park access road, Visitor’s Center to Reef Top Circle, southeast of the Superintendent Building, between Reef Top Circle and the housing area, and around the Six-Plex (Building 61).

4 Data Results

4.1 ER Results

ER profiles were modeled in the field right after collection and nightly. High amplitude resistivity anomalies were noted for discussion and flagged for additional data collection to define the extent of the shallow features.

Preliminary ER field data processing indicated shallow high resistivity features on lines ER-3, ER-10, ER-11, ER-13 and ER-14. Additional perpendicular or offset parallel ER profiles were added to further define the shallow anomalies. ER data was reprocessed back at the office and elevation and refined model parameters were applied as part of the final data processing. Appendix B contains the final processed ER data plots with interpreted features. Each profile collected is shown in combination with nearby or related lines on the same sheet and described in more detail in the following sections.

The ER-11 is a 270-foot profile that begins near the substation and travels uphill to the east ending past the dirt access road. A shallow high amplitude resistivity anomaly (>20,000 Ohm-m) occurs in the region of the access road from 190 feet to 240 feet from the beginning of the line. Profile ER-12 crosses perpendicular to ER-11 at station 210 feet

The ER-12 profile is 270 feet long and starts along the dirt access road from north to south and crosses the ER-11 profile at Station 165 feet. The high amplitude resistivity anomaly (>20,000 Ohm-m) in ER-11 is also defined in ER-12; this shallow feature could be associated with the exposed limestone bedrock along the access road or a shallow void area.

Working north along the dirt access road profile ER-3 starts at Carlsbad Caverns Hwy and overlaps profile ER-12 on the south end. ER-3 has a shallow high amplitude feature at 125 feet from the north end of the profile; ER-16 is a perpendicular profile added to further define the shallow anomaly. The anomalous feature in ER-3 and ER-16 show similar characteristics (>20,000 Ohm-m); the feature appears to shallow west of the dirt access road with a resistive feature at the ground surface.

6 | June 18, 2020

Three ER profiles were collected along the south parking stalls of the Visitor’s Center parking lot, working west to east, ER-5, ER-2 and ER-1. Profiles ER-5 and ER-1 have no high amplitude features. ER1 does have a large utility anomaly at 35 feet from the east end of the profile. Profile ER2 is the middle section of the parking lot and has an area that could contain shallow fill material on the east side of the profile. A moderate amplitude (15,000 Ohm-m) resistivity anomaly occurs at 240 feet from the east end of the ER-2 profile; perpendicular and parallel GPR profiles were collected to further define this anomaly.

Profile ER-10 is 410 feet long and crosses north of the Visitor’s Center though the stream bed and ends north of Reef Top Circle. The south end of the line has a shallow bowl feature from 80 feet to 150 feet. The northern 2/3rds of the line contains no high amplitude features. Offset parallel lines ER-18 (10 feet) and ER-19 (20 feet) were added to the west to further define the shallow feature in ER-10. Both ER-18 and ER-19 show a similar anomalous feature (>20,000 ohm-m) that indicates a possible void area.

ER Profiles ER-6, ER-7, and ER-9 were collected along Reef Top Circle working west to east, each profile overlaping the previous profile approximately 60 feet. ER-6 has two high amplitude anomalies, at 30 feet to 55 feet, and 70 feet to 90 feet. A disturbed area from 170 feet to 205 feet is likely due to the subsurface utilities. No crossings were added in this area due to terrain and parallel utilities. Profile ER-7 has no shallow high amplitude anomalies. Profile ER-9 was collected adjacent to the Bat Walk Trail just south of the superintendent’s offices. Shallow features in ER-9 could be the storm sewer from 50 feet to 60 feet. A high amplitude feature from 85 feet to 125 feet could be a subsurface void;

no crossing profiles were added in this area due to terrain and proximity to nearby utilities.

Profile ER-8 was a short resistivity line (216 feet) from the superintendent’s offices across the Bat Walk Trail and into the old parking lot. A spatially small and elevated resistivity feature at 50 feet from the north end of the profile is not likely a void. The 10,000 Ohm-m feature from 90 feet to 113 feet is likely the walkway and electric line associated with the path lights. The shallow high amplitude features occurs from 118 feet to 130 feet could be a void; however, this area is in the old parking lot and likely out of the proposed electric duct bank alignment.

ER-14 is another 410-foot long profile from Reef Top Circle north to the Six-Plex housing area. Shallow anomalies that could possibly be voids were investigated with the perpendicular crossing profile ER-20. Both ER-14 and ER-20 profiles have similar features, and although not high in amplitude, they could be associated with voids. ER-20 did cross the current water line as indicated at 237 feet from the west end of the profile.

ER profiles ER-13, ER-15 and ER-17 cover the north and east side of the Six-Plex building.

Small shallow anomalies in ER-13 could be voids. Due to limited space to add a crossing east/west profile, a 10-foot parallel offset profile (ER-17) was added east of ER13. Three features were identified in ER-13 at 90 feet, 110 feet, and 145 feet to 185 feet. Two of the three features show up in the ER-17 profile, with the shallow feature furthest south only being 15-foot long instead of 40-foot long. Profiles ER-13 and ER-17 were collected very close to a NW-SE trending electric utility and that repeatable anomaly can been seen in the southern end of both profiles. ER profile ER-15 was collected east to west and no shallow high amplitude features are in the data.

June 18, 2020 | 7

Table 2 (below) provides geographic coordinates for the potential voids. Each coordinate represents the New Mexico State Plane, NAD27 coordinate for the center of each potential or primary interpreted voids from the ER profiles.

Table 2: Coordinates of each primary void from the ER data interpretations, expressed in northings and eastings, New Mexico State Plane East, NAD27, US

Survey Feet.

Target Name Northing (ft) Easting (ft)

ER Anomaly 1 426661.91 465470.98 ER Anomaly 2 426813.01 465265.91 ER Anomaly 3 427675.81 465615.07 ER Anomaly 4 427935.75 465644.60 ER Anomaly 5 427928.48 465682.76 ER Anomaly 6 427986.49 466216.76 ER Anomaly 7 427906.20 466187.84 ER Anomaly 8 428080.18 465731.40 ER Anomaly 9 428152.80 465785.41

ER Anomaly 10 428644.52 466244.69 ER Anomaly 11 428626.75 466257.53 ER Anomaly 12 428582.96 466282.38 ER Anomaly 13 428629.38 466110.24

4.2 GPR Results

GPR transects were analyzed near real-time while in the field, and additional parallel or crossing transects were added to help define subsurface features and/or utilities.

Additional processing and analysis was performed after returning from the field, including normalizing color scales and gain settings. Anomalies in the GPR data were interpreted based on the relative changes in amplitude of the signal and patterns of the reflections.

Two categories were used for interpreting anomalous areas: probable void or weak zones in the rock (solid yellow circled areas in the data) and possible weak zones or fill areas that may have some void space (dashed yellow circled areas). Appendix C contains GPR data plots with interpreted features. Each GPR line collected is shown in combination with nearby or related lines on the same sheet. A summary of notable features is described in the following sections, working from south to north across the site.

GPR profiles ID’s 14-19 are over the area where the proposed duct bank crosses the main park entrance road (Carlsbad Caverns Highway). Lines were collected in both parallel and perpendicular orientation to the proposed electrical duct bank alignment. No probable or strong void-like features were interpreted in this area.

GPR profiles ID’s 20-22 and 50-60 are within the Visitor’s Center parking lot. Profiles 20- 22 are parallel and coincide with ER lines 5, 2 and 1 (west to east). Similar to the ER interpretations, these lines do have some anomalies; however, the character of the reflections is more of what is expected over areas of fill that may include large boulders and/or small void spaces. No large probable interpreted voids were found with the GPR.

Additional GPR lines near an anomaly interpreted along ER-2 were collected as GPR ID’s 52-60. Again, most of the GPR anomalies were not interpreted as probable voids, except one small shallow area between 26 to 38 feet from the south end of profile 56. Adjacent

8 | June 18, 2020 lines near this anomaly did not exhibit a similar feature, therefore we estimate it is minor and not widespread. GPR profiles 50 and 51 were collected over the proposed duct bank alignment in a curved area that was outside the straight line path of ER-5. Both of these profiles have interpreted probable voids within the top 15 feet of the surface. For profile 50 from the west interpreted voids include; 0 to 14, 20 to 46, 74 to 85, 105 to 128 and 202 to 214 feet. For profile 51 from the west interpreted voids include; 55 to 85, 96 to 114 and 192 to 210 feet. Again, these areas in the GPR show reflections that are also consistent with areas of fill and these possible voids may just be areas of less compacted fill or void space between larger boulders.

GPR profiles ID’s 2-6, 23 and 24 were collected within the driving lanes on the west side of the Visitor’s Center. One larger area of possible fill was identified to be consistent across most of the GPR profiles. Although this area may contain areas of smaller voids, the GPR signature was consistent to what is expected over fill containing larger boulders or inconsistent zones of rock.

GPR profiles ID’s 7-13, 25 and 26 were collected within the driving lane on the north side of the Visitor’s Center. Several shallow utilities were expected/traced in this area (discussed further in the utility survey results section) and some were imaged by the GPR and identified with black arrows added to the interpreted profiles presented in Appendix C. This area also had a consistent zone of possible fill similar to the west side of the building but also within this area was a zone of stronger amplitude GPR signals that are consistent with what is expected over voids. This zone was found to be approximately 55 to 125 feet from the west along GPR profiles 7-9, also seen on crossing lines GPR 10-13 approximately 0 to 20 feet from the south of these profiles. Other anomalies near this area within the GPR lines are consistent with possible fill and may be related to fill but they exhibit stronger reflections in the data and should be considered as probable voids.

GPR profiles ID’s 47-49 were lines collected parallel and adjacent to ER lines 6, 7 and 9 also along Reef Top Circle. GPR line 47 (along ER-6) interpreted void-like features at 86 to 104 feet and 232 to 246 feet from the west. GPR line 48 (along ER-7) also had void-like features at 52 to 72 feet and 164 to 210 feet from the west end of the line. Within this line on the GPR profile a sloping higher amplitude structure is visible that may indicate a deeper rock surface and the anomaly near 52 to 72 feet could be related to changes in fill.

For GPR line 49 (along ER-9) an anomalous area at 0 to 42 feet from the west was interpreted that may be related to a shallow void. These areas were not identified during the data review in the field, therefore further exploratory GPR lines or crossing lines were not collected.

GPR profiles ID’s 27-35 were collected along and near Permian Drive and the housing area of the park. GPR profile ID 32 was collected along Permian Drive within the pavement of the road and an interpreted probable void area at 80 to 99 feet from the west was observed but was not detected on adjacent GPR lines. On GPR profile ID 34 a void-like anomaly was observed between 537 to 542 feet from west and a similar anomaly was observed on GPR profile ID 35 at 532 to 541 feet from the west. GPR profile ID 29 has a strong high amplitude area between 30 to 37 feet from the south near a utility crossing.

This area could be related to the utility but does have a void-like appearance. GPR profile ID 27 had a high amplitude reflective area near the surface from about 2 to 22 feet from the south that may be related to fill; a similar but lower amplitude anomaly was observed

June 18, 2020 | 9 in adjacent GPR line ID 28 near this area. No other probable void features were interpreted on the remaining GPR lines within this area.

GPR profiles ID’s 42-46 were collected along the access road near the maintenance building. No probable voids or anomalous area with void-like signature in the GPR data were interpreted within this area.

GPR profiles ID’s 36-41 were collected near the west side of the Six-Plex building. This area is unpaved but some smoother areas to make GPR transects were chosen. This area appears in the GPR data to have zones of possible fill; however, no probable voids were interpreted.

Table 3 (below) provides geographic coordinates for the potential voids interpreted within the GPR data. Each coordinate represents the New Mexico State Plane, NAD27 coordinate for the center of each area of interest from the GPR profiles.

Table 3: Coordinates of each primary void from the GPR data, expressed in northings and eastings, New Mexico State Plane East, NAD27, US Survey Feet.

Target Name Northing (ft) Easting (ft) GPR Anomaly 1 427590.28 465693.68 GPR Anomaly 2 426930.31 465129.82 GPR Anomaly 3 426940.68 465150.74 GPR Anomaly 4 426966.24 465192.37 GPR Anomaly 5 426994.52 465228.01 GPR Anomaly 6 427056.54 465282.41 GPR Anomaly 7 426948.74 465181.70 GPR Anomaly 8 426972.24 465213.88 GPR Anomaly 9 427033.70 465275.98

GPR Anomaly 10 427079.96 465272.64 GPR Anomaly 11 427122.06 465287.41 GPR Anomaly 12 428295.64 466040.88 GPR Anomaly 13 428551.00 466409.39 GPR Anomaly 14 428259.33 465955.72 GPR Anomaly 15 427928.48 465682.76 GPR Anomaly 16 427899.10 465834.18 GPR Anomaly 17 427904.00 465894.84 GPR Anomaly 18 427906.17 465988.61 GPR Anomaly 19 427894.32 465995.59

4.3 Utility Survey Results

In conjunction with the ER and GPR void investigations, utility tracing and mapping along the proposed duct bank alignment were also performed. Expected utilities shown on previous survey maps provided by the park were used to help search for known water, gas, electric, telecom, and sewer lines within the proposed alignment. Conductive lines were of interest for the ER survey to avoid interference during data collection. Secondly, potential utility crossings that conflict with the proposed alignment are of interest for the

10 | June 18, 2020 duct bank design. Expanding upon the expected or known utilities, crews further searched for unknown or undocumented utilities by connecting and tracing from surface utility related features (such as hydrants and vaults), when near the alignment, to attempt to detect lines heading into the proposed duct bank route. Appendix D presents a set of map sheets along the alignment showing traced and GPS-surveyed utilities. Some area utilities are shown extending further away from the alignment that were traced from further connection points. However, this should not imply that all utilities were located within these extended areas. Also, nonconductive utilities that were not detected or located with the GPR may not have been mapped. Sewers (both sanitary/wastewater and storm water) were not traced and lines shown are based on expected line connection from site observations and historic drawing information.

5 Conditions and Limitations The professional services that form the basis for this report have been performed using that degree of care and skill ordinarily exercised, under similar circumstances, by reputable geophysicists practicing in the same locality. No warranty, expressed or implied, is made as to the professional interpretations or advice set forth.

The results, conclusions, and recommendations contained in this report are directed at, and intended to be utilized within, the scope of work contained in the agreement executed by HDR and client. This report is not intended to be used for any other purposes. HDR makes no claim or representation concerning any activity or condition falling outside the specified purposes to which this report is directed, said purposes being specifically limited to the scope of work as defined in said agreement. Inquiries as to said scope of work or concerning any activity or condition not specifically contained therein should be directed to HDR for a determination and, if necessary, further investigation.

Geophysical exploration methods are non-intrusive, indirect, and potentially influenced by a variety of natural or man-made conditions. The potential for detecting the presence or absence of underground objects or voids is based on the quality of the recorded data as limited by site conditions, and on the interpretation of the data received; hence, there will always be the potential of not observing a subsurface object or void or interpreting the presence of a subsurface object or void where one does not exist.

Appendix A

ER and GPR Line Locations with Interpreted Voids

PATH: J:\2018\18-023_CARLSBAD_(ADAM)\7.2_WORK_IN_PROGRESS\MAP_DOCS\DRAFT\CARLSBAD_ER_GPR_LOCATION.MXD - USER: EBOWLIN - DATE: 6/4/2020

ER AND GPR LINE LOCATIONS WITH INTERPRETED VOIDS

CARLSBAD CAVERNS NATIONAL PARK

GPR 15

GPR 16

GPR 51

GPR 50

GPR 20

GPR 20

GPR 14

GPR 19

GPR 18

GPR 17

GPR 51

GPR 50

ER5

ER11

ER12

ER3

ER16

Carlsbad Cavern Hwy State Hwy 7

GPR Survey ER Survey

Approx. Proposed Duct Bank Alignment

#0 Control Point

Interpreted Primary Voids-ER Interpreted Primary Voids-GPR

SHEET A1

0 50 100 Feet

PATH: J:\2018\18-023_CARLSBAD_(ADAM)\7.2_WORK_IN_PROGRESS\MAP_DOCS\DRAFT\CARLSBAD_ER_GPR_LOCATION.MXD - USER: EBOWLIN - DATE: 6/4/2020

CARLSBAD CAVERNS NATIONAL PARK

#0

#0

#0

GPR 57

GPR 51

GPR 50

GPR 4

GPR 20

GPR 21

GPR 22

GPR 54

GPR 55

GPR 56

GPR 59

GPR 60

GPR 58

GPR 2

GPR 3

GPR 23

GPR 52

GPR 53

ER5

ER1

ER2

Carl sb ad Cave rn Hwy

Sta te H wy 7

GPR Survey ER Survey

Approx. Proposed Duct Bank Alignment

#0 Control Point

Interpreted Primary Voids-ER Interpreted Primary Voids-GPR

SHEET A2

PATH: J:\2018\18-023_CARLSBAD_(ADAM)\7.2_WORK_IN_PROGRESS\MAP_DOCS\DRAFT\CARLSBAD_ER_GPR_LOCATION.MXD - USER: EBOWLIN - DATE: 6/4/2020

CARLSBAD CAVERNS NATIONAL PARK

GPR 2

GPR 3

GPR 23

GPR 47 GPR 48

GPR 49

GPR 13

GPR 12

GPR 10

GPR 5

GPR 6

GPR 24

GPR 4

GPR 7

GPR 9

GPR 8

GPR 26

GPR 25

GPR 10

ER9ER6

ER19

ER18

ER7

ER10

Reef Top Cir

GPR Survey ER Survey

Approx. Proposed Duct Bank Alignment

#0 Control Point

Interpreted Primary Voids-ER Interpreted Primary Voids-GPR

SHEET A3

PATH: J:\2018\18-023_CARLSBAD_(ADAM)\7.2_WORK_IN_PROGRESS\MAP_DOCS\DRAFT\CARLSBAD_ER_GPR_LOCATION.MXD - USER: EBOWLIN - DATE: 6/4/2020

CARLSBAD CAVERNS NATIONAL PARK

#0

GPR 47 GPR 48

GPR 49

GPR 27

ER6 ER8

ER20

ER14

ER7

ER9

Reef Top Cir

GPR Survey ER Survey

Approx. Proposed Duct Bank Alignment

#0 Control Point

Interpreted Primary Voids-ER Interpreted Primary Voids-GPR

SHEET A4

PATH: J:\2018\18-023_CARLSBAD_(ADAM)\7.2_WORK_IN_PROGRESS\MAP_DOCS\DRAFT\CARLSBAD_ER_GPR_LOCATION.MXD - USER: EBOWLIN - DATE: 6/4/2020

CARLSBAD CAVERNS NATIONAL PARK

#0

GPR 47 GPR 48

GPR 49

GPR 29

GPR 28

GPR 27GPR 30

GPR 31

GPR 37GPR 38

ER8

ER10

ER9ER6

ER20

ER7

ER14

Reef Top Cir

Permian Dr

Reef Top Cir

GPR Survey ER Survey

Approx. Proposed Duct Bank Alignment

#0 Control Point

Interpreted Primary Voids-ER Interpreted Primary Voids-GPR

SHEET A5

PATH: J:\2018\18-023_CARLSBAD_(ADAM)\7.2_WORK_IN_PROGRESS\MAP_DOCS\DRAFT\CARLSBAD_ER_GPR_LOCATION.MXD - USER: EBOWLIN - DATE: 6/4/2020

CARLSBAD CAVERNS NATIONAL PARK

#0

#0

GPR 41

GPR 29

GPR 46 GPR 45

GPR 28

GPR 36

GPR 37GPR 38

GPR 42

GPR 43

GPR 44

GPR 32

GPR 34

GPR 33

GPR 35

GPR 39

GPR 40

ER13

ER17

ER15

Reef Top Cir

Permian Dr

GPR Survey ER Survey

Approx. Proposed Duct Bank Alignment

#0 Control Point

Interpreted Primary Voids-ER Interpreted Primary Voids-GPR

SHEET A6

Appendix B

ER Data and Interpretations

PATH: J:\2018\18-023_CARLSBAD_(ADAM)\7.2_WORK_IN_PROGRESS\MAP_DOCS\DRAFT\CARLSBAD_ER_INTERP.MXD - USER: EBOWLIN - DATE: 6/4/2020

ER INTERPRETATION

CARLSBAD CAVERNS NATIONAL PARK

ER11

ER12

SHEET B1

PATH: J:\2018\18-023_CARLSBAD_(ADAM)\7.2_WORK_IN_PROGRESS\MAP_DOCS\DRAFT\CARLSBAD_ER_INTERP.MXD - USER: EBOWLIN - DATE: 6/5/2020

CARLSBAD CAVERNS NATIONAL PARK

ER3

ER16

SHEET B2

PATH: J:\2018\18-023_CARLSBAD_(ADAM)\7.2_WORK_IN_PROGRESS\MAP_DOCS\DRAFT\CARLSBAD_ER_INTERP.MXD - USER: EBOWLIN - DATE: 6/4/2020

CARLSBAD CAVERNS NATIONAL PARK

ER5

ER1

ER2

SHEET B3

PATH: J:\2018\18-023_CARLSBAD_(ADAM)\7.2_WORK_IN_PROGRESS\MAP_DOCS\DRAFT\CARLSBAD_ER_INTERP.MXD - USER: EBOWLIN - DATE: 6/4/2020

CARLSBAD CAVERNS NATIONAL PARK

ER19

ER18

ER10

SHEET B4

PATH: J:\2018\18-023_CARLSBAD_(ADAM)\7.2_WORK_IN_PROGRESS\MAP_DOCS\DRAFT\CARLSBAD_ER_INTERP.MXD - USER: EBOWLIN - DATE: 6/4/2020

CARLSBAD CAVERNS NATIONAL PARK

ER7ER6

SHEET B5

PATH: J:\2018\18-023_CARLSBAD_(ADAM)\7.2_WORK_IN_PROGRESS\MAP_DOCS\DRAFT\CARLSBAD_ER_INTERP.MXD - USER: EBOWLIN - DATE: 6/4/2020

CARLSBAD CAVERNS NATIONAL PARK

ER8ER9

SHEET B6

PATH: J:\2018\18-023_CARLSBAD_(ADAM)\7.2_WORK_IN_PROGRESS\MAP_DOCS\DRAFT\CARLSBAD_ER_INTERP.MXD - USER: EBOWLIN - DATE: 6/4/2020

CARLSBAD CAVERNS NATIONAL PARK

ER20

ER14

SHEET B7

PATH: J:\2018\18-023_CARLSBAD_(ADAM)\7.2_WORK_IN_PROGRESS\MAP_DOCS\DRAFT\CARLSBAD_ER_INTERP.MXD - USER: EBOWLIN - DATE: 6/4/2020

CARLSBAD CAVERNS NATIONAL PARK

ER13

ER17

SHEET B8

PATH: J:\2018\18-023_CARLSBAD_(ADAM)\7.2_WORK_IN_PROGRESS\MAP_DOCS\DRAFT\CARLSBAD_ER_INTERP.MXD - USER: EBOWLIN - DATE: 6/4/2020

CARLSBAD CAVERNS NATIONAL PARK

ER15

SHEET B9

Appendix C

GPR Data and Interpretations

PATH: J:\2018\18-023_CARLSBAD_(ADAM)\7.2_WORK_IN_PROGRESS\MAP_DOCS\DRAFT\CARLSBAD_GPR_INTERP.MXD - USER: EBOWLIN - DATE: 6/5/2020

GPR INTERPRETATION

CARLSBAD CAVERNS NATIONAL PARK

Carlsbad Cavern Hwy

GPR 16

GPR 15

GPR 14

SHEET C1

GADAMS

Text Box 0 10 20 30 40 50 60 70

GADAMS

Text Box 0 10 20 30 40 50 60 70

GADAMS

Text Box 0 10 20 30 40 50 60 70

GADAMS

Text Box ft

GADAMS

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GADAMS

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GADAMS

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GADAMS

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GADAMS

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GADAMS

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GADAMS

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GADAMS

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GADAMS

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GADAMS

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GADAMS

Text Box

PATH: J:\2018\18-023_CARLSBAD_(ADAM)\7.2_WORK_IN_PROGRESS\MAP_DOCS\DRAFT\CARLSBAD_GPR_INTERP.MXD - USER: EBOWLIN - DATE: 6/5/2020

CARLSBAD CAVERNS NATIONAL PARK

Carlsbad Cavern Hwy

State Hwy 7

GPR 19

GPR

GPR 17

SHEET C2

GADAMS

Text Box

GADAMS

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GADAMS

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GADAMS

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GADAMS

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GADAMS

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GADAMS

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GADAMS

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GADAMS

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GADAMS

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GADAMS

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GADAMS

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GADAMS

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GADAMS

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GADAMS

Text Box 0 10 20 30 40 50 60 70 80

GADAMS

Text Box 0 10 20 30 40 50 60 70 80

GADAMS

0 10 20 30 40 50 60 70 80

PATH: J:\2018\18-023_CARLSBAD_(ADAM)\7.2_WORK_IN_PROGRESS\MAP_DOCS\DRAFT\CARLSBAD_GPR_INTERP.MXD - USER: EBOWLIN - DATE: 6/5/2020

CARLSBAD CAVERNS NATIONAL PARK

Carl sb ad Cave rn Hwy

State Hwy 7

GPR 20

GPR 21 GPR 22

SHEET C3

GADAMS

Text Box ft0

GADAMS

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GADAMS

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GADAMS

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GADAMS

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GADAMS

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GADAMS

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GADAMS

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GADAMS

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GADAMS

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GADAMS

Text Box ft0

GADAMS

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GADAMS

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GADAMS

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GADAMS

Text Box 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210 220 230 240 250 260

GADAMS

Text Box 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210 220 230 240 250 260 270

GADAMS

0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210 220 230 240 250 260 270

PATH: J:\2018\18-023_CARLSBAD_(ADAM)\7.2_WORK_IN_PROGRESS\MAP_DOCS\DRAFT\CARLSBAD_GPR_INTERP.MXD - USER: EBOWLIN - DATE: 6/5/2020

CARLSBAD CAVERNS NATIONAL PARK

GPR 52

GPR 53

GPR 54

GPR 55

SHEET C4

GADAMS

Text Box ft

GADAMS

Text Box

GADAMS

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GADAMS

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GADAMS

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GADAMS

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GADAMS

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GADAMS

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GADAMS

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GADAMS

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GADAMS

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GADAMS

Text Box 0 10 20 30 40 50

GADAMS

Text Box 0 10 20 30 40 50

GADAMS

Text Box 0 10 20 30 40 50

GADAMS

0 10 20 30 40 50

PATH: J:\2018\18-023_CARLSBAD_(ADAM)\7.2_WORK_IN_PROGRESS\MAP_DOCS\DRAFT\CARLSBAD_GPR_INTERP.MXD - USER: EBOWLIN - DATE: 6/5/2020

CARLSBAD CAVERNS NATIONAL PARK

GPR 56

GPR

GPR 58

SHEET C5

GADAMS

Text Box 0 10 20 30 40 50

GADAMS

Text Box 0 10 20 30 40 50

GADAMS

Text Box 0 10 20 30 40 50

GADAMS

Text Box ft

GADAMS

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GADAMS

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GADAMS

PATH: J:\2018\18-023_CARLSBAD_(ADAM)\7.2_WORK_IN_PROGRESS\MAP_DOCS\DRAFT\CARLSBAD_GPR_INTERP.MXD - USER: EBOWLIN - DATE: 6/5/2020

CARLSBAD CAVERNS NATIONAL PARK

GPR 59

GPR 60

SHEET C6

GADAMS

Text Box ft

GADAMS

Text Box

GADAMS

Text Box

GADAMS

Text Box

GADAMS

Text Box

GADAMS

Text Box ft

GADAMS

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GADAMS

Text Box

GADAMS

Text Box

GADAMS

Text Box 0 10 20 30 40 50

GADAMS

0 10 20 30 40 50

PATH: J:\2018\18-023_CARLSBAD_(ADAM)\7.2_WORK_IN_PROGRESS\MAP_DOCS\DRAFT\CARLSBAD_GPR_INTERP.MXD - USER: EBOWLIN - DATE: 6/5/2020

CARLSBAD CAVERNS NATIONAL PARK

Carls bad

Cave rn

Hw y

GPR 51

GPR 50

SHEET C7

GADAMS

Text Box ft

GADAMS

Text Box

GADAMS

Text Box

GADAMS

Text Box

GADAMS

Text Box

GADAMS

Text Box ft

GADAMS

Text Box

GADAMS

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GADAMS

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GADAMS

Text Box

GADAMS

Text Box 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210 220

GADAMS

0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210 220

PATH: J:\2018\18-023_CARLSBAD_(ADAM)\7.2_WORK_IN_PROGRESS\MAP_DOCS\DRAFT\CARLSBAD_GPR_INTERP.MXD - USER: EBOWLIN - DATE: 6/5/2020

CARLSBAD CAVERNS NATIONAL PARK

GPR 24

GPR 2

GPR 3

GPR 23

GPR 4

SHEET C8

GADAMS

Text Box 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190

GADAMS

Text Box 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190

GADAMS

Text Box 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200

GADAMS

Text Box 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200

GADAMS

Text Box 0 10 20 30 40 50 60 70 80 90

GADAMS

Text Box ft

GADAMS

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GADAMS

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PATH: J:\2018\18-023_CARLSBAD_(ADAM)\7.2_WORK_IN_PROGRESS\MAP_DOCS\DRAFT\CARLSBAD_GPR_INTERP.MXD - USER: EBOWLIN - DATE: 6/5/2020

CARLSBAD CAVERNS NATIONAL PARK

GPR 5

GPR 6

SHEET C9

GADAMS

Text Box ft

GADAMS

Text Box

GADAMS

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GADAMS

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GADAMS

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GADAMS

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GADAMS

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Text Box 0 10 20 30 40

GADAMS

0 10 20 30 40

PATH: J:\2018\18-023_CARLSBAD_(ADAM)\7.2_WORK_IN_PROGRESS\MAP_DOCS\DRAFT\CARLSBAD_GPR_INTERP.MXD - USER: EBOWLIN - DATE: 6/5/2020

CARLSBAD CAVERNS NATIONAL PARK

GPR 7

GPR 9GPR 8

GPR 26

GPR 25

SHEET C10

GADAMS

Text Box 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210 220 230 240 250 260 270 280 290 300 310 320 330 340

GADAMS

Text Box 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210 220 230 240 250 260 270 280 290 300 310 320 330 340

GADAMS

Text Box 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210 220 230 240 250 260 270 280 290 300 310 320 330 340

GADAMS

Text Box 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210 220 230 240 250 260 270 280 290 300 310 320 330 340

GADAMS

Text Box 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210 220 230 240 250 260 270 280 290 300 310 320 330 340

GADAMS

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GADAMS

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GADAMS

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GADAMS

Text Box 2.5

GADAMS

Text Box 7.5

GADAMS

Text Box ft

GADAMS

Text Box 2.5

GADAMS

Text Box

GADAMS

Text Box 7.5

GADAMS

Text Box ft

GADAMS

Text Box 2.5

GADAMS

Text Box

GADAMS

Text Box 7.5

GADAMS

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GADAMS

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GADAMS

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GADAMS

PATH: J:\2018\18-023_CARLSBAD_(ADAM)\7.2_WORK_IN_PROGRESS\MAP_DOCS\DRAFT\CARLSBAD_GPR_INTERP.MXD - USER: EBOWLIN - DATE: 6/5/2020

CARLSBAD CAVERNS NATIONAL PARK

GPR

GPR

12GPR

GPR

SHEET C11

GADAMS

Text Box 0 10 20

GADAMS

Text Box 0 10

GADAMS

Text Box 0 10

GADAMS

Text Box 0 10 20

GADAMS

Text Box ft

GADAMS

Text Box 2.5

GADAMS

Text Box

GADAMS

Text Box 7.5

GADAMS

Text Box

GADAMS

Text Box 12.5

GADAMS

Text Box 17.5

GADAMS

Text Box

GADAMS

Text Box ft

GADAMS

Text Box 2.5

GADAMS

Text Box

GADAMS

Text Box 7.5

GADAMS

Text Box

GADAMS

Text Box 12.5

GADAMS

Text Box

GADAMS

Text Box 17.5

GADAMS

Text Box ft

GADAMS

Text Box 2.5

GADAMS

Text Box

GADAMS

Text Box 7.5

GADAMS

Text Box

GADAMS

Text Box 12.5

GADAMS

Text Box

GADAMS

Text Box 17.5

GADAMS

Text Box ft

GADAMS

Text Box 2.5

GADAMS

Text Box

GADAMS

Text Box 7.5

GADAMS

Text Box

GADAMS

Text Box 12.5

GADAMS

Text Box

GADAMS

17.5

PATH: J:\2018\18-023_CARLSBAD_(ADAM)\7.2_WORK_IN_PROGRESS\MAP_DOCS\DRAFT\CARLSBAD_GPR_INTERP.MXD - USER: EBOWLIN - DATE: 6/5/2020

CARLSBAD CAVERNS NATIONAL PARK

Reef Top Cir

GPR 49

GPR 48

GPR 47

SHEET C12

GADAMS

Text Box 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210 220 230 240 250 260

GADAMS

Text Box 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210 220 230 240 250 260

GADAMS

Text Box 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210 220 230 240 250 260

GADAMS

Line

GADAMS

Line

GADAMS

Line

GADAMS

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GADAMS

Line

GADAMS

Line

GADAMS

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GADAMS

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GADAMS

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PATH: J:\2018\18-023_CARLSBAD_(ADAM)\7.2_WORK_IN_PROGRESS\MAP_DOCS\DRAFT\CARLSBAD_GPR_INTERP.MXD - USER: EBOWLIN - DATE: 6/5/2020

CARLSBAD CAVERNS NATIONAL PARK

GPR 30

GPR 31

SHEET C13

GADAMS

Text Box ft

GADAMS

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GADAMS

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GADAMS

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GADAMS

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GADAMS

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GADAMS

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PATH: J:\2018\18-023_CARLSBAD_(ADAM)\7.2_WORK_IN_PROGRESS\MAP_DOCS\DRAFT\CARLSBAD_GPR_INTERP.MXD - USER: EBOWLIN - DATE: 6/5/2020

CARLSBAD CAVERNS NATIONAL PARK

Perm ian

Dr

GPR 32

GPR 33

SHEET C14

GADAMS

Text Box ft

GADAMS

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GADAMS

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GADAMS

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GADAMS

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Text Box 0 20 40 60 80 100 120 140 160 180 200 220 240 260 280 300 320 340 360 380 400 420 440 460 480 500 520 540 560 580 600 620 640

GADAMS

Text Box 0 20 40 60 80 100 120 140 160 180 200 220 240 260 280 300 320 340 360 380 400 420 440 460 480 500 520 540 560 580 600 620 640

GADAMS

Text Box 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210 220

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PATH: J:\2018\18-023_CARLSBAD_(ADAM)\7.2_WORK_IN_PROGRESS\MAP_DOCS\DRAFT\CARLSBAD_GPR_INTERP.MXD - USER: EBOWLIN - DATE: 6/5/2020

CARLSBAD CAVERNS NATIONAL PARK

Permian Dr GPR 34

GPR 35

SHEET C15

GADAMS

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GADAMS

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GADAMS

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GADAMS

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Text Box 0 20 40 60 80 100 120 140 160 180 200 220 240 260 280 300 320 340 360 380 400 420 440 460 480 500 520 540 560 580 600 620 640 660

GADAMS

Text Box 0 20 40 60 80 100 120 140 160 180 200 220 240 260 280 300 320 340 360 380 400 420 440 460 480 500 520 540 560 580 600 620 640

GADAMS

Text Box 470 480 490 500 510 520 530 540 550 560 570 580 590 600

GADAMS

Text Box 470 480 490 500 510 520 530 540 550 560 570 580 590 600

GADAMS

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PATH: J:\2018\18-023_CARLSBAD_(ADAM)\7.2_WORK_IN_PROGRESS\MAP_DOCS\DRAFT\CARLSBAD_GPR_INTERP.MXD - USER: EBOWLIN - DATE: 6/5/2020

CARLSBAD CAVERNS NATIONAL PARK

Permian Dr

GPR 29

GPR 28

GPR 27

SHEET C16

GADAMS

Text Box ft

GADAMS

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GADAMS

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GADAMS

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GADAMS

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GADAMS

Text Box 0 10 20 30 40 50 60 70 80 90 100

GADAMS

0 10 20 30

PATH: J:\2018\18-023_CARLSBAD_(ADAM)\7.2_WORK_IN_PROGRESS\MAP_DOCS\DRAFT\CARLSBAD_GPR_INTERP.MXD - USER: EBOWLIN - DATE: 6/5/2020

CARLSBAD CAVERNS NATIONAL PARK

Per mian

Dr

GPR 42

GPR 43

GPR 44 ¯

SHEET C17

GADAMS

Text Box ft

GADAMS

Text Box

GADAMS

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GADAMS

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GADAMS

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GADAMS

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GADAMS

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GADAMS

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GADAMS

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GADAMS

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GADAMS

Text Box 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210

GADAMS

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GADAMS

0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210

PATH: J:\2018\18-023_CARLSBAD_(ADAM)\7.2_WORK_IN_PROGRESS\MAP_DOCS\DRAFT\CARLSBAD_GPR_INTERP.MXD - USER: EBOWLIN - DATE: 6/5/2020

CARLSBAD CAVERNS NATIONAL PARK

GPR 46 GPR 45

SHEET C18

GADAMS

Text Box ft

GADAMS

Text Box

GADAMS

Text Box

GADAMS

Text Box

GADAMS

Text Box

GADAMS

Text Box ft

GADAMS

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GADAMS

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GADAMS

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GADAMS

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GADAMS

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GADAMS

0 10 20 30 40

PATH: J:\2018\18-023_CARLSBAD_(ADAM)\7.2_WORK_IN_PROGRESS\MAP_DOCS\DRAFT\CARLSBAD_GPR_INTERP.MXD - USER: EBOWLIN - DATE: 6/5/2020

CARLSBAD CAVERNS NATIONAL PARK

GPR 36

GPR 37

GPR 38

SHEET C19

GADAMS

Text Box 0 10 20 30 40 50 60 70 80 90 100 110 120

GADAMS

Text Box 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 170

GADAMS

Text Box 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 170 180

GADAMS

Text Box ft

GADAMS

Text Box

GADAMS

Text Box

GADAMS

Text Box

GADAMS

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GADAMS

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GADAMS

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PATH: J:\2018\18-023_CARLSBAD_(ADAM)\7.2_WORK_IN_PROGRESS\MAP_DOCS\DRAFT\CARLSBAD_GPR_INTERP.MXD - USER: EBOWLIN - DATE: 6/5/2020

CARLSBAD CAVERNS NATIONAL PARK

GPR 39

GPR 40

GPR 41

SHEET C20

Appendix D

Utility Mapping Results

SITE UTILITIES

CARLSBAD CAVERNS

NATIONAL PARK

çñ

Telecomm vault w/ empty conduit (not traced)

Carlsbad Cavern Hwy

State Hwy 7

Electric Node Conduit

O Lighting &&M Meter

")#* Transformer

") Vault Unknown Segment Electric Segment

Natural Gas Node

Unknown #* Stickup "T Tank

Gas Segment Communicati...

Node çñ Vault

Communication Segment Approx.

Proposed Duct Bank Alignment

#0 Control Point Fence

Wastewater Node Unknown

%, Manhole

")C Clean Out lJ Lift Station

%, Stormwater Manhole

!@C Stormwater Culvert

!@ Stormwater Inlet Sanitary Sewer Segment Stormwater Segment

Domestic Water Node %, Manhole R7d Valve ")¬« Hydrant ") Vault

Water Segment Unknown Segment

0 50 100 Feet

Sheet D1 Sheet D2

Sheet D3 Sheet D4

Sheet D5

Sheet D6

Service Layer Credits: Esri, USDA Farm Service Agency

SHEET D1

NATIONAL PARK

#0

#0

#0 çñ

R7d

R7d R7d

Carl sba d C ave rn Hwy

Sta te

Hwy 7

Electric Node Conduit

O Lighting &&M Meter

")#* Transformer

") Vault Unknown Segment Electric Segment

Natural Gas Node

Unknown #* Stickup "T…