Capistrano Beach County Park Sand Compatibility and Use Guidelines https://www.ocregister.com/wp-content/uploads/2019/05/OCR-L-CAPO-0525-02-JAG-1.jpg

Prepared For:

County of Orange, OC Parks

13042 Old Myford Road

Irvine, CA 92620

Prepared By:

Moffatt & Nichol

4225 E. Conant St.

Long Beach, CA 90808

M&N File: 8189-04 and 10186-09

September 2020

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Contents

1. INTRODUCTION

1.1 Document Objectives

2. PROPOSED SAND COMPATIBILITY AND USE CHARACTERISTICS

2.1 Sand Placement Footprint and Quantities

2.2 Source Sand Quality

2.2.1 Physical Testing

2.2.2 Chemical Testing

2.3 Sand Placement Timing

2.4 Haul Routes, Staging, and Storage

2.5 Proposed Monitoring

2.6 Sand Placement Summary

2.7 Submittals

3. PROJECT NOTIFICATION REPORT OUTLINE

3.1 Introduction

3.2 Source Material

3.2.1 General Site Location

3.2.2 Specific Location of Source Material at Site

3.2.3 Volume of Material (Total volume and volume proposed for beach placement)

3.2.4 Material Testing

3.2.5 Debris Management

3.3 Transportation and Placement

3.3.1 Site Location and Timing

3.3.2 Transportation Method

3.3.3 Beach Placement Method

3.4 Public Notification Process

3.5 Project Monitoring

3.6 Previous Projects at Capistrano Beach County Park

3.7 Assumption of Risk, Waiver of Liability and Indemnity

4. REFERENCES

APPENDIX A CAPISTRANO BEACH GRAIN SIZE CHARACTERISTICS

APPENDIX B CHEMICAL TESTING ANALYTES

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TABLE OF TABLES

Table 2-1. Summary of Sand Placement Parameters Table 3-1. Proposed Project Limits Table 3-2. Previous Projects at Capistrano Beach County Park Table A-1. Capistrano Beach Profile Grain Size Summary (Kinnetic Laboratories, 2007) Table B-1. Source Sediment Chemical Testing Analytes

TABLE OF FIGURES

Figure 1-1. Project Vicinity Figure 1-2. Project Location Figure 1-3. Capistrano Beach County Park – Preferred Interim Plan (red boxes identify focus areas of the SCUG) Figure 2-1. Sand Placement Envelope Figure 2-2. Anticipated Haul Routes and Access Points Figure A-1. 2013 Capistrano Beach Sampling Locations (M&N & Kinnetic Laboratories, 2014) Figure A-2. Capistrano County Beach Grain Size Envelope, depicted in beige color (M&N & Kinnetic

Laboratories, 2014) Figure A-3. 2007 Capistrano Beach Sampling Locations (Kinnetic Laboratories, 2007)

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1. Introduction Capistrano Beach County Park (Capo Beach) is a recreational beach with public facilities managed by OC Parks (Figure 1-1). The site has a length of approximately 1,500 feet, and is bordered by Doheny State Beach to the west, private homes to the east, Pacific Coast Highway and railway to the north, and the Pacific Ocean to the south (Figure 1-2). Capo Beach has been subjected to ongoing shoreline erosion that has caused the loss of park facilities and continues to threaten the remaining facilities and amenities, including public parking, restrooms, picnic tables, walkways, and a coastal trail / bicycle path.

Figure 1-1. Project Vicinity

Capo Beach is located at the upcoast end of the Oceanside Littoral Cell. The sediment budget for the coastline between Dana Point and San Mateo (near San Clemente) is estimated to be in a 56,000 cubic yards (cy) per year deficit (erosion) in dry years, and in a 3,000 cy per year surplus (accretion) in wet years (Ninyo & Moore, 2015). Large nourishment events (1.6M cubic yards) occurred in the 1960s and 70s which maintained Capo Beach into the late 1980s. Since that time, no significant nourishment events have occurred. With reduced natural and artificial sediment supply, acute erosion events (El Niño and other large wave events) have caused significant and ongoing, long-term erosion.

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Figure 1-2. Project Location

Emergency shoreline protection measures were taken in response to 2015-2016, 2017-2018, 2019, and 2020 storm events. One emergency measure was to install sandbags (“sandcubes”) in the northern and southern reaches of the site. These sandcubes are exposed to wave action and subject to damage. Sand cover of the sandcubes will minimize damage to the sandcubes, improve beach access, and improve beach aesthetics. OC Parks is providing this Sand Compatibility and Use Guidelines (SCUG) document which is intended to outline the process for utilizing available sand to provide cover of the sandcubes.

1.1 Document Objectives

This SCUG document outlines a process whereby beach-compatible material can be evaluated and placed at Capo Beach. The project objectives are prepared to align with key guidelines of the regional San Diego County Sediment Compatibility and Opportunistic Use Program (SCOUP) model (M&N, 2006). This Capo Beach program deviates from the standards set by the implementation of other jurisdictions (Imperial Beach, Coronado, Encinitas, Oceanside, etc.) in that the Capo Beach sand placement activities will be limited to relatively small volumes of sand, placed above the mean high tide line, and as cover for existing sandcubes. As a part of the OC Parks Preferred Interim Plan (Figure 1-3), this SCUG document is intended to guide the maintenance and sand cover of existing and proposed sandcube shoreline protection. The Preferred Interim Plan is intended to drive shoreline management action for approximately 2-5 years.

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Figure 1-3. Capistrano Beach County Park – Preferred Interim Plan (red boxes identify focus areas of the SCUG)

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2. Proposed Sand Compatibility and Use Characteristics Capo Beach has been the site of recent erosion and emergency shoreline protection measures, as detailed in the recent Coastal Resilience Study (Moffatt & Nichol, 2019) and emergency permit applications.

Sandcubes were placed along the back beach at the north end along the bicycle path and at the south end along the parking lot. This SCUG program consists of placing designated compatible sand over and generally within the footprint of the existing sandcube shoreline protection. The typical OC Parks sand placement project will occupy a small footprint within the maximum envelope.

The following sections provide details which apply to sand placement projects at Capo Beach, including

(1) sand placement envelope and quantities, (2) sand qualities, (3) sand placement timing, (4) haul routes, staging, and storage; and (5) proposed monitoring.

2.1 Sand Placement Footprint and Quantities

The proposed envelope along Capo Beach is shown in Figure 2-1. The proposed envelope is broken into two reaches, North Reach and South Reach, intended to encompass existing and proposed sandcube protection measures under the Preferred Interim Plan. The North Reach extends approximately 500 linear feet; the South Reach extends approximately 225 linear feet. However, individual placement projects could take place in smaller footprints within the proposed overall envelope.

Unlike a typical beach fill project, placement at Capo Beach will not take the form of berm placement or surf zone placement. Instead, imported sediment will be placed as a layer over the existing and proposed sandcubes along the back beach to provide sandcube protection. The elevation, width, length, and slope of the material placement will depend upon the quantity and quality of material imported, as well as the condition of the beach at the time of material placement. It is anticipated that sediment may slightly increase the back-beach elevation and width beyond the sandcube footprint, and allowance is made for such results within the proposed SCUG envelope.

The amount of imported sand for a typical event is expected to be 500 – 1,000 cy. However, if source sand becomes available and budget allows, each of the north and south reach placement envelopes can accommodate up to 10,000 cy (maximum of 20,000 cy per maintenance event). Sand placement events are to occur on an as-needed basis to provide maintenance and support of the Preferred Interim Plan over the next 2-5 years. Within a one-year period, no greater than 20,000 cy total is proposed to be placed.

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Figure 2-1. Sand Placement Envelope

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2.2 Source Sand Quality

Sand cover material is anticipated to be from local projects which generate beach-quality sand, such as from flood control channel maintenance, ocean outlets maintenance, Dana Point Harbor maintenance dredging, upland construction, or from a commercial supplier of recreational sand. It is anticipated that many of these projects would generate sand which has been approved for beach placement as part of the source sand project’s permits.

Offshore sources of beach quality sand may be available for use as beach nourishment however the costs of acquiring such material is very high, and its use would likely not be practical for this Capo Beach SCUG application.

Evaluating opportunistic sand sources to determine if they are appropriate for beach placement is a process based upon sediment characterization and compatibility protocols. OC Parks would require source material testing prior to placement on the beach. Chemical and grain size testing would be required of all sources as discussed further below. Any source not meeting these predetermined standards would be rejected. Source material compatibility for placement at Capo Beach will be determined through physical and chemical testing, as described below.

2.2.1 Physical Testing

Sediment gradation analysis identifies the composition of material, identifying the percent silt, clay, sand, and gravel. Sediment qualities for placement is proposed to ensure that the source material does not drastically alter the existing beach conditions. The source material must be tested, analyzed, and classified prior to construction (referred to as sediment characterization) by collecting a certain number of samples and sample depths depending upon the location and volume of the material to be repurposed. Two (2) samples from the source material with be physically tested per 10,000 cy of import material. This material must also be analyzed for chemistry. Source site characterization will be performed and summarized under the Project Notification Report (PNR) process, as outlined in Section 3.

Sediment quality testing was performed at Capo Beach in 2013 (M&N and Kinnetic Laboratories, 2014) and in 2007 (Kinnetic Laboratories, 2007; Laguna Geoscience, 2007), in support of Dana Point Harbor maintenance dredging. In each of these projects, sediment samples were collected, logged, and analyzed for grain size characteristics along two shore-perpendicular transects. The finest grained sample at Capistrano Beach contained 7% fines. Further details of the sediment sampling and results are provided in Appendix A. These Capistrano Beach sediment characterization results (Kinnetic Laboratories 2014, Kinnetic Laboratories, 2007; Laguna Geoscience, 2007) will be used to evaluate the source material suitability. Grain size suitability determinations of source material will be conducted according to SCOUP guidelines (Moffatt & Nichol, 2006). Specifically, the following criteria will be used in determining whether sediments from the source site are suitable for placement at Capo Beach:

• Mean gradation curves of the source material must not be strikingly dissimilar to the mean gradation curve of the receiving beach. Furthermore, the composite gradation curves of the source material should, for the most part, fall within the receiver beach compatibility envelope as defined by the fine and coarse limits.

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• Must be a minimum of 75 percent sand, optimally 80 percent sand or greater and with a percent sand content within 10 percent, and preferably slightly coarser than, of the grain size envelope of the beach profile.

• The percentage of fine grain material (<0.074 mm) shall not exceed that of the finest beach sample from Capo Beach by more than ten percent.

• Material should reasonably match the color of natural beach sand after exposure to the marine environment.

• Material should not form a hardpan after placement.

• Material must be free of trash and debris based on visual inspection.

Less-than-optimum beach fill material is material not compatible with the dry beach, but compatible with lower underwater areas. Less-than-optimum material (typically containing 15-45 percent fines) is not proposed for use, as surf zone (i.e., nearshore) placement is not within the scope of the Capo Beach sand placement program.

2.2.2 Chemical Testing

Material cannot be suspected of containing hazardous chemicals based on US Environmental Protection Agency (EPA) Tier I or II assessment. If there is a potential for chemical contamination, sediment chemical testing will be performed through one (1) composite sample per 10,000 cy of import material.

Sediment chemistry results are compared to National Oceanic and Atmospheric Administration (NOAA) Screening Quick Reference Table (SQUIRT) Guidelines (Buchman, 2008). These guidelines are used to screen sediments for contaminant concentrations that might cause biological effects and to identify sediments for further toxicity testing. The guidelines are based on a NOAA database correlating biological effects with concentrations of 9 trace metals, 13 individual Polycyclic aromatic hydrocarbons (PAHs), 3 classes of PAHs, and 3 classes of chlorinated organic hydrocarbons. The guidelines are based on a database assembled by Long et al. (1995). This study developed ERL and ERM values that provide a statistical relationship between adverse biological effects and sediment compound concentration levels.

For any given contaminant, the ERL guideline represents the 10th percentile concentration value in the NOAA database that might be expected to cause adverse biological effects. Therefore, results found to be below established ERL values represent concentrations at which biological effects would rarely be observed. The incidence of adverse biological effects increases to 20% to 30% for most trace metals and 40% to 60% for most organics when concentrations exceeded ERL values but were lower than the ERM values. When concentrations exceed ERM values, the incidence of adverse effects increased to 60% to 90% for most trace metals and 80% to 100% for most organics.

To assess the source sediment’s suitability for human contact, the chemical contamination concentration results were compared with “Regional Screening Levels for Chemical Contaminants at Superfund Sites” (USEPA Region 9, updated 2015). Regional Screening Levels (RSLs) are broken into two categories:

residential and industrial. RSLs were developed with USEPA toxicity data, standard exposure assumptions, and standardized equations and are an umbrella term for USEPA Region 9 Preliminary Remediation Goals (PRGs), USEPA Region 3 Risked-Based Concentrations (RBCs) and EPA Region 6 Human Health Medium – Specific Screening Levels (HHMSSLs). USEPA deemed RSLs to be protective for humans over a lifetime.

RSLs do not represent ecological impact contaminant levels. Although RSLs were developed for superfund

OC Parks | Sand Compatibility and Use Guidelines | Page 8 sites, their consideration in non-superfund sites can be beneficial to the project, helping to assess areas and materials that demand greater attention and/or avoidance.

California Human Health Screening Levels (CHHSLs) were also referenced to assess the source sediment’s suitability for human contact and potential human health risks. CHHSLs apply to 54 hazardous chemicals that are protective of human health (Cal/EPA, updated 2010). CHHSL values are broken into two categories: residential and industrial/commercial. CHHSLs were developed by the Office of Environmental Health Hazard Assessment (OEHHA) with USEPA and California Environmental Protection Agency (Cal/EPA) toxicity data, and standard exposure assumptions.

Chemical analytes for testing and corresponding RSLs are summarized in Appendix A. If there are particularly elevated concentrations of chemical contaminants, then the source material proposed for beach placement may be assessed as to whether or not it is suitable for human contact through comparison with regional screening levels. Retesting may be performed to isolate suitable sediment for placement.

2.3 Sand Placement Timing

Sand placement is to occur on an as-needed basis when erosion of existing sandcube and back beach protection occurs during storm events. Historically, the most erosive storm events tend to occur during the fall and winter periods, especially during an El Niño season, although recently, significant erosion of the site has occurred during the summer season south swells (e.g. July 4th, 2020 event). The majority of sand placement is proposed to occur in the fall and winter seasons – September through May, or Labor Day to Memorial Day. Limited placement may also occur in summer if opportunities arise and/or the need is present should south-swell storm events cause erosion which threatens the longevity of the sandcubes.

2.4 Haul Routes, Staging, and Storage

Sand could be delivered either by truck or pipeline, depending on the material source. Trucks would drive material from the excavation location within the County of Orange and nearby areas to Capo Beach for placement. Trucks would generally use local roads to access the beach. During placement of beach sand, OC Parks would coordinate the proposed haul routes with other projects that may impact identified haul routes. Beach access points include Beach Rd within Capistrano Beach County Park, and Park Lantern Rd within Doheny State Beach.

Areas for construction staging and landside access for placing sand are required. It is anticipated that the imported sand would be placed immediately on the beach upon delivery, however there may be a need for short-term temporary storage of the imported sand. California State Parks has indicated that OC Parks can utilize the southeastern end of Doheny State Beach for a staging and storage area, as long as the County obtains a State Parks Right-of-Entry (ROE) permit. This ROE permit will be provided to CCC for any sand placement event which utilizes this Doheny State Beach area. The Doheny State Beach staging and storage area would not interrupt bike trail access and would not eliminate any public parking spaces. The Capistrano Beach staging and access area would impact up to 15 parking spaces at the south end of the parking lot. Impacts would be temporary for a short-term only (likely less than one week). Both staging

OC Parks | Sand Compatibility and Use Guidelines | Page 9 areas are located in the vicinity of the placement envelopes and are limited to disturbed/developed areas.

Haul routes and the staging/storage areas are depicted in Figure 2-2. These limits of the staging and storage areas shall be provided to the contractor. The minimum number of parking spaces that are required shall be used.

Figure 2-2. Anticipated Haul Routes and Access Points

Construction materials or waste will not be stored where it could potentially be subjected to wave erosion and dispersion. In addition, no machinery will be placed, stored, or otherwise located in the Intertidal zone at any time, except for the minimum necessary to implement the project.

Construction equipment shall not be washed on the beach or in the beach parking lots. Construction debris and sediment shall be properly contained and secured on site with BMPs, to prevent the unintended transport of sediment and other debris into coastal waters by wind, rain, or tracking.

Construction debris and sediment shall be removed from the construction areas as necessary to prevent the accumulation of sediment and other debris which may be discharged into coastal waters. Any and all debris resulting from construction activities shall be removed from the project site within 24 hours of completion of construction. Debris shall be disposed of at a debris disposal site outside the coastal zone.

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2.5 Proposed Monitoring

Due to the current lack of sandy beach along Capistrano Beach, the presence of sensitive species along Capistrano Beach is not typical. However, OC Parks will retain a qualified biologist or environmental resources specialist to conduct pre-construction bird surveys if sand placement is proposed during bird nesting season (April 1 to August 31).

• Nesting birds – A nesting bird survey will be conducted prior to construction activities occurring within the period of April 1 to August 31. If an active nest of any bird is found within 300 ft of the project, a monitor will conduct bird and noise surveys each day during significant construction activities. The nest will not be removed or disturbed. Construction activities will only occur if construction noise levels are at or below a peak of 65 dB at the nest(s) site. If construction noise exceeds a peak level of 65 dB at the nest(s) site, sound mitigation measures may be employed. If proved ineffective in reducing noise levels below peak level, construction will not recommence until either new sound mitigation can be employed, or the birds have fledged.

Since the SCUG sand placement is proposed only within the footprint of the sandcubes and above the high tide line, monitoring for California grunion is not necessary. However, the County will be mindful of the potential presence of grunion eggs if sand placement occurs during predicted grunion spawning periods and if sand conditions along Capo Beach have become suitable for grunion spawning. If spawning is suspected, sand placement activities will be postponed.

Any inadvertent impacts to sensitive habitat areas by the sand placement shall be reported to the Executive Director of the California Coastal Commission (CCC) within 2 weeks of occurrence and shall be mitigated. Such mitigation shall require an amendment to the CCC Coastal Development Permit or a new permit unless the CCC Executive Director determines that no amendment or new permit is legally required. Other approvals may also be required from the other permitting agencies (USACE, RWQCB, SLC, and California State Parks and Recreation) and any inadvertent impacts will be reported to these agencies concurrently.

A qualified on-site debris monitor (geotechnical background or similar) will evaluate the source site prior to the material being loaded into trucks for placement on the beach. The monitor will ensure, to the maximum extent practicable, that material being loaded into the trucks is free of debris. The receiving beach shall be monitored periodically on every day of sand deposition by County staff to ensure the material being placed on the beach is free of debris. If any debris or non-sandy material is detected, the specific beach replenishment project(s) that was/were using that sand material shall be halted at that site(s) and the contractor will be responsible for removing all debris from the beach immediately. The project will be restarted once debris is cleared from the beach and a method is formulated to ensure, to the maximum extent practicable, that no further debris is generated from the source site.

2.6 Sand Placement Summary

The proposed SCUG has defined parameters for allowed activities that take into account physical conditions specific to the Capo Beach Preferred Interim Plan; these are summarized in Table 2-1.

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Table 2-1. Summary of Sand Placement Parameters

Design Characteristics Nourishment Site

Method of Placement Allowed

Nourishment Site Length (approximate) North Reach: 500 ft or less; South Reach: 225 ft or less

Sandcubes Cover Yes

Beach Berm No

Surf Zone (i.e. Nearshore) No

Maximum Quantities Allowed Given % Fines

Maximum Annual Volume 20,000 cy/year

0 – 17%* Fines for Source Material 20,000 cy/year

Up to 25% Fines, Nearshore placement only Not Proposed

Timing and Duration for Placement

All Seasons Anticipated increased placement activity between Labor Day and Memorial Day

Monday – Friday, no holidays 7:30 am to dusk (Typical construction hours)

Staging and Stockpile Locations South end of Doheny State Beach parking lot and south end of Capo Beach parking lot

Monitoring Bird nesting monitoring if placement occurs during the period of April 1 to August 31

* Up to 17% fines for source material is based on the SCOUP guidelines for allowance of up to 10% finer (or coarser) material than the receiver site; the finest grain-size sample at Capo Beach sediment was previously determined to be 7%.

2.7 Submittals

A summary of events and assessment of the project effects, both beneficial and adverse, will be provided to CCC at the end of every year. This analysis will serve as the basis for any modifications that can be made to optimize the program.

Remedies or modifications must be submitted to the CCC Executive Director and the CCC Executive Director will determine whether the proposed remediation may be authorized under the City’s CDP or whether the work shall require an amendment the permit or a new permit. The remedies or modifications will also be presented to the other permitting agencies (USACE, RWQCB, SLC, and CSP) for their review and approval.

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3. Project Notification Report Outline A Project Notification Report (PNR) will be submitted to the California Coastal Commission (CCC) four weeks prior to each sand placement event. Procedures for producing and submitting the PNR are outlined in the following section.

3.1 Introduction

Provide the basic outline of the proposed project (proposed placement event) and in compliance with Table 3-1. Specify any permit conditions. This Project Notification Report will request CCC concurrence and a Notice to Proceed from the CCC.

Table 3-1. Proposed Project Limits

Placement Site

Maximum Annual

Quantity

(CY)

Maximum Project

Length (ft)

Placement Scenarios

Season

Max.

Percent

Fines Allowed

Proposed Maximum

Volume per Event (CY)

North Reach

South Reach

20,000 cy

North Reach:

500 ft

South Reach:

225 ft

Sandcube cover along backbeach

All Seasons (1) 17%

North Reach:

10,000 cy

South Reach:

10,000 cy

(1) No work can occur on holiday weekends of Memorial Day and Labor Day, and weekends adjacent to Independence Day, when

Independence Day falls on a Friday or Monday.

3.2 Source Material

3.2.1 General Site Location

Include maps, figures, and text description of the source site location and surrounding areas.

3.2.2 Specific Location of Source Material at Site

Describe where on the site the source material is found.

3.2.3 Volume of Material (Total volume and volume proposed for beach placement)

Describe the total volume of material available at the source site and the volume that is being proposed for placement.

3.2.4 Material Testing

Present the source material physical and chemical testing results, as outlined in Section 2.2. The results will be provided, which will include any chemistry and grain size testing and comparison to RSLs and receiver site grain size, respectively.

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3.2.5 Debris Management

Describe general content of material with regard to debris. This will include a description of the kinds of debris found in the source material, methods for screening, separating, and/or retrieving the debris, and disposal methods.

3.3 Transportation and Placement

3.3.1 Site Location and Timing

Describe the existing conditions of the beach site and the timing of project. Include projected schedule.

3.3.2 Transportation Method

Describe how the material will get to the beach site. Outline trucking routes and provide figures, if needed.

Indicate how many trucks and frequency.

3.3.3 Placement Method

Describe the placement method, including any equipment that may be needed to construct the project.

Outline specific public access closures or restrictions.

3.4 Public Notification Process

This section will outline how the public is being notified of the overall program and this specific project. A posting will be placed at the construction site with a notice indicating the project scope, expected dates of construction, and/or beach closure 1-2 weeks prior to placement.

3.5 Project Monitoring

This section will summarize the monitoring activities for the project. This section will also include the reporting protocols for the monitoring efforts as outlined in the permit requirements.

3.6 Previous Projects at Capistrano Beach County Park

This section will provide a table listing any sand placement events that have occurred at Capistrano Beach as part of the program or otherwise.

Table 3-2. Previous Projects at Capistrano Beach County Park

Site Project Dates of

Placement Volume

(CY)

Total Volume to Date (CY)

Placement Method

Placement Length

Width (if applicable)

% fines

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3.7 Assumption of Risk, Waiver of Liability and Indemnity

The County of Orange acknowledges and agrees (i) that the site may be subject to hazards such as erosion and landslides; (ii) to assume the risks to the County and the property that is the subject of this permit of injury and damage from such hazards in connection with this permitted development; (iii) to unconditionally waive any claim of damage or liability against the Coastal Commission, its officers, agents, and employees for injury or damage from such hazards; and (iv) to indemnify and hold harmless the Commission, its officers, agents, and employees with respect to the Commission’s approval of the project against any and all liability, claims, demands, damages, costs (including costs and fees incurred in defense of such claims), expenses, and amounts paid in settlement arising from any injury or damage due to such hazards.

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4. References Buchman, M.F. 2008. NOAA Screening Quick Reference Tables, NOAA OR&R Report 08-1, Seattle WA.

Office of Response and Restoration Division, National Oceanic and Atmospheric Administration, 34 pages.

Kinnetic Laboratories. 2007. Dredge Material Evaluation, Dana Point Harbor Maintenance Dredging.

Prepared for OC Dana Point Harbor, County of Orange.

Laguna Geoscience. 2007. 2006/2007 Dana Point Harbor Geotechnical Data and Soils Logs. Prepared for OC Dana Point Harbor, County of Orange.

Long, E. R., D. D. MacDonald, S. L. Smith, and F. D. Calder. 1995. Incidence of adverse biological effects within ranges of chemical concentrations in marine and estuarine sediments. Environmental Management 19(1): 81-97.

Moffatt & Nichol (M&N). 2006. Final Sand Compatibility and Opportunistic Use Program Plan. Prepared for San Diego Association of Governments. Prepared by Moffatt & Nichol. March 2006.

M&N. 2019. Capistrano Beach County Park, Coastal Resilience Study. Prepared for County of Orange, OC Parks. Prepared by M&N. 25 April 2019.

M&N and Kinnetic Laboratories. 2014. Sampling and Analysis Report, Dredge Material Evaluation, Dana Point Harbor Maintenance Dredging. Prepared by Kinnetic Laboratories and M&N. Prepared for OC Dana Point Harbor, County of Orange. March 2014.

M&N. 2009. Coastal Regional Sediment Management Plan – For the San Diego Region. Prepared for the San Diego Association of Governments and the California Coastal Sediment Management Workgroup.

Prepared by Moffatt & Nichol, in association with Everest International Consultants and Science Applications International Corporation. March 2009.

Patsch, K. and Griggs, G.B.. 2006. Littoral cells, sand budgets, and beaches: understanding California's shoreline (p. 40). Institute of Marine Sciences, University of California, Santa Cruz.

USEPA Region 9. 2015. Regional Screening Levels (RSL) for Chemical Contaminants at Superfund Sites.

http://www.epa.gov/region9/superfund/prg/. Updated November 2015.

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Appendix A. Capistrano Beach Grain Size Characteristics

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The most recent sediment quality testing was performed at Capo Beach in 2013 (M&N and Kinnetic Laboratories, 2014), in support of Dana Point Harbor maintenance dredging. A series of grab samples were collected, logged, and analyzed for grain size characteristics, along two transects at Capistrano Beach Figure A-1). Each transect ran perpendicular to the shoreline. Grab samples were collected at four approximate elevations (+12, +6, 0 and -6 feet mean lower low water [MLLW]) along each of the two transects. Sieve analysis data show that sediments collected above mean lower low water along the transects were poorly graded sand with very little or no fines (98% - 99% sand and gravel). Elevations below MLLW along the transects contained a slightly higher percentage of silt (93% - 94% sand and gravel).

The finest grained sample at Capistrano Beach contained 7% fines. Figure A-2 shows the Capistrano Beach grain size envelope based on the two transects.

Sediment sampling and analysis for Capistrano Beach also occurred in 2007 (Kinnetic Laboratories, 2007;

Laguna Geoscience, 2007) in support of Dana Point Harbor Maintenance Dredging. Two beach profile transects (Figure A-3) were sampled to assess the beach from the upper dry beach (+12 ft MLLW) to the nearshore submerged profile (-30 ft MLLW). Sediment was identified to range from Sand with Gravel to Silty Sand (Table A-1) with the finer material being found offshore and the coarser material being closer inshore. The upper beach (+6 to +12 ft MLLW), which is the focus of this SCUG, was identified as Sand.

The gradation was determined to have an average of 4% gravel, 95% sand, and 1% fines. The color was generally a pale yellowish brown, and the particles were subangular to subrounded in shape.

Figure A-1. 2013 Capistrano Beach Sampling Locations (M&N & Kinnetic Laboratories, 2014)

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Figure A-2. Capistrano County Beach Grain Size Envelope, depicted in beige color (M&N &

Kinnetic Laboratories, 2014)

Figure A-3. 2007 Capistrano Beach Sampling Locations (Kinnetic Laboratories, 2007)

T-1

T-2

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Table A-1. Capistrano Beach Profile Grain Size Summary (Kinnetic Laboratories, 2007)

Sample Depth (ft MLLW)

Soil Classification Color Particle Shape Gravel

(percent) Sand

(percent) Fines

(percent) T-1 (North)

12 Sand (SP) Pale yellowish brown (10YR 6/2) Subangular to subrounded 0 100 0 6 Sand (SP) Pale yellowish brown (10YR 6/2) Subangular to subrounded 7 93 0 0 Sand with Gravel (SP) Dark yellowish brown (10YR 4/2) Subangular to subrounded 20 77 3 -6 Sand (SP) Light olive gray (5Y 5/2) Subangular to subrounded 0 99 1

-12 Sand (SP) Light brown (5YR 5/6) Subangular to subrounded 11 88 1 -18 Sand with Gravel (SP) Light brown (5YR 5/6) Subangular to subrounded 15 85 0 -24 Sand with Silt (SP-SM) Light olive gray (5Y 5/2) Subangular to subrounded 0 89 11 -30 Silty Sand (SM) Light olive gray (5Y 5/2) Subangular to subrounded 0 56 44

T-2 (South) 12 Sand (SP) Dark yellowish brown (10YR 4/2) Subangular to subrounded 9 89 3 6 Sand (SP) Pale yellowish brown (10YR 6/2) Subangular to subrounded 0 99 1 0 Sand with Gravel (SP) Dark yellowish brown (10YR 4/2) Subangular to subrounded 39 61 0 -6 Sand (SP) Light olive gray (5Y 5/2) Subangular to subrounded 0 98 2

-12 Sand with Silt (SP-SM) Light olive gray (5Y 5/2) Subangular to subrounded 1 89 10 -18 Sand (SP) Light olive brown (5YR 5/6) Subangular to subrounded 0 99 1 -24 Silty Sand (SM) Light olive gray (5Y 5/2) Subangular to subrounded 0 70 30 -30 Silty Sand (SM) Light olive gray (5Y 5/2) Subangular to subrounded 0 55 45

T-1 Average Percentage 7 86 8 T-2 Average Percentage 6 83 12 T-1 and T-2 Average Percentage 6 84 10

OC Parks | Sand Compatibility and Use Guidelines | Page 20

Appendix B. Chemical Testing Analytes

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Table B-2. Source Sediment Chemical Testing Analytes

GROUPINGS Analyte Analytical Method

NOAA

Screening3 Human RSLs4 Human CHHSLs5

Results Units MDL1 TRL2 ERL ERM Residential Industrial Residential Commercial/

Industrial Grain Size Plumb (1981) NA NA % Conventionals Ammonia 350.1M 0.04 0.5 mg/kg

TOC USEPA 9060A 0.07 0.2 %

Moisture 160.3 NA NA % TSS SM 2540 D 5 5 mg/L

TVS SM 2540E NA NA %

TPH SW-846 NA NA mg/kg TRPH 1664M 1.6 25 mg/kg Metals Arsenic USEPA 6020 0.051 0.2 8.2 70 0.68 3.0 0.07 0.24 mg/kg Cadmium USEPA 6020 0.005 0.2 1.2 9.6 71 980 1.7 7.5 mg/kg Chromium USEPA 6020 0.017 0.2 81 370 100,000 1,000,000 mg/kg Copper USEPA 6020 0.018 0.2 0.234 270 3100 4700 3000 38000 mg/kg Lead USEPA 6020 0.009 0.2 46.7 218 400 800 18 180 mg/kg Mercury USEPA 7471A 0.001 0.04 0.15 0.71 1.1 4.6 1600 16000 mg/kg Nickel USEPA 6020 0.016 0.2 20.9 51.6 150 2200 150 3500 mg/kg Selenium USEPA 6020 0.035 0.2 39 580 380 4800 mg/kg Silver USEPA 6020 0.004 0.2 1 3.7 39 580 380 4800 mg/kg Zinc USEPA 6020 0.26 2 150 410 2300 35000 23000 100000 mg/kg Organotins Dibutyltin Krone 1989 0.6 6 µg/kg Monobutyltin Krone 1989 0.97 6 µg/kg Tetrabutyltin Krone 1989 0.36 6 µg/kg Tributyltin Krone 1989 0.33 6 <2.0 <2.7 1900 25000 µg/kg

OC Parks | Sand Compatibility and Use Guidelines | Page 22

Screening3 Human RSLs4 Human CHHSLs5

Results Units MDL1 TRL2 ERL ERM Residential Industrial Residential Commercial/

Industrial PAHs 1-Methylnapthalene EPA 8270C SIM 1.04 20 18000 73000 µg/kg 2-Methylnapthalene EPA 8270C SIM 1.04 20 70 670 24000 300000 µg/kg 2,4,5-Trichlorophenol EPA 8270C SIM 1.5 10 µg/kg 2,4,6-Trichlorophenol EPA 8270C SIM 3.6 20 44000 160000 µg/kg 2,4-Dichlorophenol EPA 8270C SIM 2.7 20 180000 1800000 µg/kg 2,4-Dimethylphenol EPA 8270C SIM 3.1 20 1200000 12000000 µg/kg 2,4-Dinitrophenol EPA 8270C SIM 63 1000 120000 1200000 µg/kg 2-Chlorphenol EPA 8270C SIM 3.4 20 390000 5100000 µg/kg Acenaphthene EPA 8270C SIM 0.76 20 16 500 360000 4500000 µg/kg Acenaphthylene EPA 8270C SIM 0.73 20 44 640 µg/kg Anthracene EPA 8270C SIM 0.66 20 85.3 1100 1800000 23000000 µg/kg Benzo(a)anthracene EPA 8270C SIM 1.01 20 261 1600 160 2900 µg/kg Benzo(a)pyrene EPA 8270C SIM 0.64 20 430 1600 16 290 38 130 µg/kg Benzo (b) Fluoranthene EPA 8270C SIM 0.77 20 160 2900 µg/kg Benzo (g,h,i) Perylene EPA 8270C SIM 1.14 20 µg/kg Benzo (k) Fluoranthene EPA 8270C SIM 0.96 20 1600 29000 µg/kg Chrysene EPA 8270C SIM 0.76 20 384 2800 16000 290000 µg/kg Dibenz (a,h) Anthracene EPA 8270C SIM 0.53 20 63.4 260 16 290 µg/kg Fluoranthene EPA 8270C SIM 0.78 20 600 5100 240000 3000000 µg/kg Fluorene EPA 8270C SIM 0.7 20 19 540 240000 3000000 µg/kg Indeno (1,2,3-c,d) Pyrene EPA 8270C SIM 0.66 20 160 2900 µg/kg Naphthalene EPA 8270C SIM 0.83 20 160 2100 3800 17000 µg/kg Pentachlorophenol EPA 8270C SIM 88 1000 µg/kg Phenanthrene EPA 8270C SIM 1.08 20 240 1500 µg/kg Pyrene EPA 8270C SIM 0.82 20 665 2600 180000 2300000 µg/kg Total Low Weight PAHs EPA 8270C SIM 552 3160 µg/kg Total High Weight PAHs EPA 8270C SIM 1700 9600 µg/kg Total PAHs EPA 8270C SIM 4022 44792 µg/kg

OC Parks | Sand Compatibility and Use Guidelines | Page 23

Screening3 Human RSLs4 Human CHHSLs5

Results Units MDL1 TRL2 ERL ERM Residential Industrial Residential Commercial/

Industrial PCBs PCB 018 USEPA 8082A ECD 0.086 0.5 µg/kg PCB 028 USEPA 8082A ECD 0.53 0.5 µg/kg PCB 037 USEPA 8082A ECD 0.12 0.5 µg/kg PCB 044 USEPA 8082A ECD 0.25 0.50 µg/kg PCB 049 USEPA 8082A ECD 0.095 0.50 µg/kg PCB 052 USEPA 8082A ECD 0.15 0.50 µg/kg PCB 066 USEPA 8082A ECD 0.1 0.50 µg/kg PCB 070 USEPA 8082A ECD 0.15 0.50 µg/kg PCB 074 USEPA 8082A ECD 0.1 0.50 µg/kg PCB 077 USEPA 8082A ECD 0.082 0.50 38 160 µg/kg PCB 081 USEPA 8082A ECD 0.07 0.50 12 48 µg/kg PCB 087 USEPA 8082A ECD 0.15 0.50 µg/kg PCB 099 USEPA 8082A ECD 0.079 0.50 µg/kg PCB 101 USEPA 8082A ECD 0.078 0.50 µg/kg PCB 105 USEPA 8082A ECD 0.053 0.50 120 490 µg/kg PCB 110 USEPA 8082A ECD 0.082 0.50 µg/kg PCB 114 USEPA 8082A ECD 0.068 0.50 120 500 µg/kg PCB 118 USEPA 8082A ECD 0.078 0.50 120 490 µg/kg PCB 119 USEPA 8082A ECD 0.072 0.50 µg/kg PCB 123 USEPA 8082A ECD 0.092 0.50 120 490 µg/kg PCB 126 USEPA 8082A ECD 0.072 0.50 0.036 0.15 µg/kg PCB 128 USEPA 8082A ECD 0.08 0.50 µg/kg PCB 138 USEPA 8082A ECD 0.075 0.50 µg/kg PCB 149 USEPA 8082A ECD 0.07 0.50 µg/kg PCB 151 USEPA 8082A ECD 0.069 0.50 µg/kg PCB 153 USEPA 8082A ECD 0.097 0.50 µg/kg PCB 156 USEPA 8082A ECD 0.073 0.50 120 500 µg/kg PCB 157 USEPA 8082A ECD 0.076 0.50 120 500 µg/kg PCB 158 USEPA 8082A ECD 0.07 0.50 µg/kg PCB 167 USEPA 8082A ECD 0.088 0.50 120 500 µg/kg PCB 168 USEPA 8082A ECD 0.069 0.50 µg/kg PCB 169 USEPA 8082A ECD 0.093 0.50 0.12 0.51 µg/kg PCB 170 USEPA 8082A ECD 0.066 0.50 µg/kg PCB 177 USEPA 8082A ECD 0.089 0.50 µg/kg PCB 180 USEPA 8082A ECD 0.083 0.50 µg/kg PCB 183 USEPA 8082A ECD 0.064 0.50 µg/kg

OC Parks | Sand Compatibility and Use Guidelines | Page 24

Screening3 Human RSLs4 Human CHHSLs5

Results Units MDL1 TRL2 ERL ERM Residential Industrial Residential Commercial/

Industrial PCB 187 USEPA 8082A ECD 0.087 0.50 µg/kg PCB 189 USEPA 8082A ECD 0.068 0.50 130 520 µg/kg PCB 194 USEPA 8082A ECD 0.082 0.50 µg/kg PCB 201 USEPA 8082A ECD 0.13 0.50 µg/kg PCB 206 USEPA 8082A ECD 0.078 0.50 µg/kg Total PCBs USEPA 8082A ECD 22.7 180 230 970 89 300 µg/kg Pesticides 2,4'-DDD US EPA 8081A 0.2 2 µg/kg 2,4'-DDE US EPA 8081A 0.18 2 µg/kg 2,4'-DDT US EPA 8081A 0.14 2 µg/kg 4,4'-DDD US EPA 8081A 0.26 2 2 20 2300 9600 2300 9000 µg/kg 4,4'-DDE US EPA 8081A 0.3 2 2.2 27 2000 9300 1600 6300 µg/kg 4,4-DDT US EPA 8081A 0.33 2 1 7 1900 8500 1600 6300 µg/kg Total DDTs US EPA 8081A 1.58 46.1 µg/kg Aldrin US EPA 8081A 0.31 2 39 180 33 130 µg/kg Alpha-BHC US EPA 8081A 0.29 2 µg/kg Beta-BHC US EPA 8081A 0.26 2 µg/kg Chlordane US EPA 8081A 1.9 10 1700 7500 430 1700 µg/kg DCPA (Dacthal) US EPA 8081A 0.02 8 610000 6200000 µg/kg Delta-BHC US EPA 8081A 0.32 2 µg/kg Dieldrin US EPA 8081A 0.23 2 34 140 35 130 µg/kg Endosulfan I US EPA 8081A 0.36 2 470000 7000000 µg/kg Endosulfan II US EPA 8081A 0.18 2 µg/kg Endosulfan Sulfate US EPA 8081A 0.26 2 µg/kg Endrin US EPA 8081A 0.2 2 1900 25000 19000 250000 µg/kg Endrin Aldehyde US EPA 8081A 0.2 2 µg/kg Endrin Ketone US EPA 8081A 0.3 2 µg/kg Gamma-BHC US EPA 8081A 0.23 2 570 2500 µg/kg Heptachlor US EPA 8081A 0.22 2 130 630 130 520 µg/kg Heptachlor Epoxide US EPA 8081A 0.18 2 70 330 µg/kg Methoxychlor US EPA 8081A 0.17 2 32000 410000 340000 3800000 µg/kg Toxaphene US EPA 8081A 8.5 40 490 2100 460 1800 µg/kg Phthalates Bis(2-Ethylhexyl) Phthalate EPA 8270C SIM 4.1 20 39000 160000 µg/kg Butylbenzyl Phthalate EPA 8270C SIM 4.4 20 290000 1200000 µg/kg Diethyl Phthalate EPA 8270C SIM 5 20 5100000 66000000 µg/kg Dimethyl Phthalate EPA 8270C SIM 5.4 20 780000 12000000 µg/kg Di-n-butyl Phthalate EPA 8270C SIM 5.1 20 630000 8200000 µg/kg

OC Parks | Sand Compatibility and Use Guidelines | Page 25

Screening3 Human RSLs4 Human CHHSLs5

Results Units MDL1 TRL2 ERL ERM Residential Industrial Residential Commercial/

Industrial Di-n-octyl Phthalate EPA 8270C SIM 4.7 20 63000 820000 µg/kg Phenols 2-Methylphenol EPA 8270C SIM 5.3 20 µg/kg 2-Nitrophenol EPA 8270C SIM 2.4 20 µg/kg 3,4-Methylphenol EPA 8270C SIM µg/kg 4,6-Dinitro-2-Methylphenol EPA 8270C SIM µg/kg 4-Chloro-3-Methylphenol EPA 8270C SIM 3.5 20 µg/kg Bisphenol A EPA 8270C SIM 320000 31000000 µg/kg 2,4,6-Trichlorophenol EPA 8270C SIM 6300 82000 µg/kg 2,4-Dichlorophenol EPA 8270C SIM 19000 250000 µg/kg 2,4-Dimethylphenol EPA 8270C SIM 130000 1600000 µg/kg 2,4-Dinitrophenol EPA 8270C SIM 13000 160000 µg/kg 2-Chlorophenol EPA 8270C SIM 39000 580000 µg/kg Pentachlorophenol EPA 8270C SIM 1000 4000 4400 13000 µg/kg Total phenols EPA 8270C SIM 3.7 30 1900000 25000000 µg/kg Pyrethroids Allethrin (Bioallethrin) GC/MS/MS 0.09 1 µg/kg Bifenthrin GC/MS/MS 0.085 1 95000 1200000 µg/kg Cyfluthrin-beta (Baythroid) GC/MS/MS 0.1 1 160000 2100000 µg/kg Cyhalothrin-Lamba GC/MS/MS 0.078 1 32000 410000 µg/kg Cypermethrin GC/MS/MS 0.15 1 63000 820000 µg/kg Deltamethrin (Decamethrin) GC/MS/MS 0.093 1 47000 620000 µg/kg Esfenvalerate GC/MS/MS 0.087 1 160000 2100000 µg/kg Fenpropathrin (Danitol) GC/MS/MS 0.091 1 160000 2100000 µg/kg Fenvalerate (sanmarton) GC/MS/MS 0.094 1 160000 2100000 µg/kg Fluvalinate GC/MS/MS 0.12 1 63000 820000 µg/kg Permethrin (cis and trans) GC/MS/MS 0.088 1 320000 4100000 µg/kg Resmethrin (Bioresmethrin) GC/MS/MS 0.079 1 190000 2500000 µg/kg Resmethrin GC/MS/MS 0.013 1 190000 2500000 µg/kg Sumithrin (Phenothrin) GC/MS/MS 0.09 1 µg/kg Tetramethrin GC/MS/MS 0.085 1 µg/kg Tralomethrin GC/MS/MS 0.1 1 47000 620000 µg/kg

1Method Detection Limit (dry weight) 2Target Reporting Limit (dry weight) 3Effects Range Low (ERL) and Effects Range Median (ERM) sediment quality objectives from Long et al. (1995).

4Regional Screening Levels for Chemical Contaminants at Superfund Sites (USEPA Region 9, updated 2017).

5California Human Health Screening Levels for Soil (Cal/EPA, 2005-updated 2010).