Sweetwater-Silvergate Eelgrass Mitigation Project

Status In-progress County San Diego
Project Type Compensatory mitigation Location 32.64639° N, -117.10501° W Map
Project Area (Acres) < 0.1 Last Updated 13 April 2022
Project Abstract During a horizontal drilling operation a frac-out occurred releasing drilling muds and cutting sediments into the Sweetwater Marsh channel, harming eelgrass beds.; Mitigation Type: Onsite.
Project Groups Eelgrass Mitigation Projects
Administrative Region National Oceanic and Atmospheric Administration - Byrant Chesney, NOAA

Project Identification

CDP 6-06-140 CCC - Record Number
150316SWR2010HC_N1232 NMFS - Record Number
06C-077 SWRCB - 401 Certification Letter (e.g., Site Number or WDID)
200601820-LAM USACE - DA File Number

Habitat Plan

Site NamePhaseActivitySubActivitiesHabitatSubHabitatAcresActivity StatusWater Regime
Sweetwater Silvergate Frac Out Transplant None Restoration (unspecified) Unspecified Estuarine Wetland Submerged aquatic vegetation < 0.1 Construction in-progress

Related Habitat Impacts

Impact Project NameHabitatAcres LostType of Loss
Silvergate 138kV Horizontal Directional Drilling Frac-out-impact Estuarine Wetland < 0.1 Lost Permanent


Sweetwater Silvergate Frac Out Pre Project 1 Construction in-progress No Data
Sweetwater Silvergate Frac Out Pre Project 2 Construction in-progress No Data
Sweetwater Silvergate Frac Out Transplant Construction in-progress < 0.1


DateTypeDescriptionSite Name
2013-08-01 Monitoring end Estimated date
2013-03-14 Project entered Project entered into database
2008-07-25 Groundwork end Actual date
2008-07-24 Groundwork start Actual date
2008-07-24 Monitoring start Actual date
2007-10-01 Groundwork end Estimated date
2007-10-01 Groundwork start Estimated date
2006-10-01 Project start date Estimated date


Contact Keith Merkel Merkel and Associates, Inc. Principal Consultant
Contact Shannon Turek San Diego Gas & Electric Not applicable/Unknown


No Data

Related CRAM Assessments

Visit DateVersionSite NameWetland TypeIndex Score
No Data

Performance Criteria

StatusDetailsEvaluation Date
Criteria not evaluated yet See plan in Files & Links 2007-10-01
Name File Type Submitted On Submitted By
2 Year Post-Construction Survey Other 2013-03-14 SFEI, SFEI
3 Month Post Transplant Survey Other 2013-03-14 SFEI, SFEI
3 Year Post Transplant Survey Other 2013-03-14 SFEI, SFEI
4 Year Post Transplant Survey Other 2013-03-14 SFEI, SFEI
Post Transplant Survey Other 2013-03-14 SFEI, SFEI
Tracker Data Form Other 2013-03-14 SFEI, SFEI

How to Use the Habitat Development Curve

Habitat Development Curves (HDCs) are used to determine the developmental status and trajectory of on-the-ground projects to create, restore, or enhance California wetland and stream habitats. Each HDC is based on assessments of habitat condition for different age areas of one habitat type that in aggregate represent the full spectrum of habitat development. The assessments of condition are provided by expert applications of the California Rapid Assessment Method (CRAM). Visit the CRAM website for more information about CRAM.

For each HDC, reference condition is represented by areas of a habitat that consistently get very high CRAM scores, have not been subject to disruptive management practices, and exist within landscapes that are protected and managed for their natural conditions. The horizontal lines intersecting the top of an HDC represent the mean CRAM score and standard deviation of scores for 25 qualifying reference areas.

The age of a project is estimated as the elapsed time in years between the groundwork end date for the project and the date of the CRAM assessment. To add or update a groundwork end date, use the Project Events form in Project Tracker (ptrack.ecoatlas.org). The minimum age in years of a non-project area, including any natural reference area, is estimated from all available local information, including historical maps and imagery, historical written accounts, and place-specific scientific studies of habitat development.

An HDC can be used to address the following questions:

  1. At what time in the future will the area of assessed habitat achieve the reference condition or other milestones in habitat development? The HDC can answer this question if the CRAM score for the assessed area is within the confidence interval of the HDC. The answer is the time in years along the HDC between the current age of the assessed area and the future date corresponding to the intersection of the HDC and the reference condition or other milestone.
  2. Is the area of assessed habitat likely to develop faster, slower, or at the same pace as most other areas of the same habitat type? The habitat area is likely to develop faster, slower, or at the same pace if the CRAM score for the area is above, below, or within the confidence interval of the HDC, respectively.
  3. What can be done to improve the condition of the habitat area or to increase its rate of development? HDCs by themselves cannot answer this question. Possible answers can be inferred by the following analysis that involves HDCs:
    1. Examine the HDC for each of the four CRAM Attributes;
    2. Identify the Attribute(s) scoring below the HDC;
    3. For any low-scoring Attribute, examine the component Metric Scores (note: the Metric Scores for any public CRAM assessment in the CRAM database can be obtained through EcoAtlas);
    4. Assume the low score of an Attribute is due to its low-scoring Metric(s);
    5. Consider modifying the design or management of the habitat area in ways that will sustainably increase its score(s) for the low-scoring Metric(s).

For more information about CRAM Attributes and Metrics, including their scientific rationale, see the CRAM Manual.

Display Habitat Development Curves For Wetland Type:

CRAM Site Scores