Contra Costa Water District Shortcut Pipeline Improvement Project Phases 1-3 Mitigation at Rheem Creek Property

Status Completed County Contra Costa
Project Type Compensatory mitigation Location 37.97658° N, -122.35661° W Map
Project Area (Acres) No Data Last Updated 8 May 2024
Project Abstract Rheem Creek Preserve: To address SCPL Phase 3 impacts after SCPL Phase 2 implementation in 2018 the preserve is being enlarged from 6.37 to 9.72 acres. Within the 9.72-acre site there are 4.59 acres of verified wetlands. Three (3) wetland acres were used for SCPL Phase 2 and 1.52 acres will be used for SCPL Phase 3.
Administrative Region San Francisco Bay Regional Water Quality Control Board - Xavier Fernandez, SFBRWQCB

Project Identification

2 CW403674 SWRCB - 401 Certification Letter (e.g., Site Number or WDID)
819511 SWRCB - CIWQS Place Number

Habitat Plan

Site NamePhaseActivitySubActivitiesHabitatSubHabitatAcresActivity StatusWater Regime
No Data

Related Habitat Impacts

Impact Project NameHabitatAcres LostType of Loss
No Data


Rheem Creek CCWD SCPL Phases 1-3 Mitigation Wetlands Completed No Data


DateTypeDescriptionSite Name
2020-04-10 Monitoring end The 2020 Year 5 survey results show that the seasonal wetland habitat contained all three characteristics (vegetation, soils and hydrology) to consider it a wetland. The wetland acres at the time of the survey were 3.65 acres, which is in excess of the 3.17 acres required. The area of the seasonal wetland is consistent with performance expectations. The site was dominated (88 percent) by wetland plants (OBL, FACW, FAC) at the time of the survey. The vegetation criteria has been met for Year 5 and is consistent with performance expectations. No Cal-IPC “High” rated invasive plant species were observed during the survey. Wildlife has been observed utilizing the wetland habitat. The Year 5 wetland monitoring report concludes annual wetland monitoring for this site as all performance criteria have been met.


Consultant Jeff Olberding Olberding Environmental, Inc. Not applicable/Unknown


No Data

Related CRAM Assessments

Visit DateVersionSite NameWetland TypeIndex Score
No Data

Performance Measures

Plan NamePlan GoalPerformance MeasureMeasure ValueStatusEvaluation Date
Mitigation and Monitoring Plan Ecosystem Protection, Restoration, and Enhancement Conduct wetland delineation and verify established wetlands meet ACOE criterion
1 / 0 not applicable
measure achieved
Mitigation and Monitoring Plan Ecosystem Protection, Restoration, and Enhancement Percent relative cover of hydrophytic vegetation
88 / 51 percent
measure achieved
Mitigation and Monitoring Plan Ecosystem Protection, Restoration, and Enhancement Saturated soil within 12” of the surface for no less than 18 consecutive days during average rainfall years
1 / 0 not applicable
measure achieved 2020-04-10
Name File Type Submitted On Submitted By
Year 5 Monitoring Report Monitoring Report 2022-01-24 Katie Miller , Olberding Environmental, Inc.

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 ( 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