HELIX Environmental Planning, Inc.
7578 El Cajon Boulevard
La Mesa, CA 91942
619.462.1515 tel
619.462.0552 fax
www.helixepi.com
October 17, 2025 00987.00015.001
Yu Tagai
City of Lake Elsinore
130 S Main Street
Lake Elsinore, CA 92530
[email protected] | 951-674-3124 (x246)
Subject: Contract Augment to Provide Additional Environmental Consulting Services for the Murrieta Creek Multi-Use Trail Construction Project
The original written contract dated June 9, 2025 between HELIX Environmental Planning, Inc. (HELIX) and the City of Lake Elsinore (Client) is hereby augmented as follows:
SCOPE OF WORK (See attached)
CURRENT CONTRACT TOTAL $331,100
Task
Number Task Name Cost
13 Two-Year Biological Monitoring of the RWQCB Mitigation Area $49,200 14 Five-Year Biological Monitoring of the MSHCP and LBVI Mitigation Areas 165,100 15 Management, Meetings, and Agency Support 19,900
16 Restoration/Revegetation Installation Mobilization 7,100 17 RWQCB Mitigation Area Seed Installation 2,800
18 RWQCB Mitigation Area Maintenance 11,900
19 LBVI Mitigation Area Hand Watering 95,800
20 LBVI Mitigation Area Plant Installation 24,700
21 LBVI Mitigation Area Seed Installation 6,400
22 LBVI Mitigation Area Maintenance 88,900
23 MSHCP Revegetation Area Seed Installation 24,200
24 MSHCP Revegetation Area Maintenance 107,200
25 Easement Coordination and Support 10,900
Subtotal without Optional Tasks $614,000
Optional Tasks
26 MSHCP Revegetation Area Hand Watering $12,600
27 LBVI Mitigation Fine Grading 12,900
Subtotal with Optional Tasks $639,600
TOTAL REVISED CONTRACT without Optional Tasks $945,200
TOTAL REVISED CONTRACT with Optional Tasks $970,700
Contract Augment to Yu Tagai Page 2 of 8
October 17, 2025
Sincerely,
Karl Osmundson
Biology Division Manager
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October 17, 2025
HELIX will continue work on this contract, inclusive of this augment, in a timely manner and in accordance with the original Terms and Conditions and Schedule of Fees.]
___________________________
(Client)
By: ___________________________
Name
Title
Date: ___________________________
Contract Augment to Yu Tagai Page 4 of 8
October 17, 2025
SCOPE OF WORK
Task 13 Two-Year Biological Monitoring of the RWQCB Mitigation Area. 13a: Installation Monitoring and Reporting. HELIX will monitor site preparation consisting of recontouring three temporarily impacted drainage locations and seed installation in the 0.046- acre Regional Water Quality Control Board (RWQCB) mitigation areas identified in the 2024 Murrieta Creek Multi-Use Trail Project On-Site Streambed Revegetation Plan. The RWQCB installation monitoring will include pre- and post-construction photos and monitoring of seed installation. Specifically, HELIX will:
• Take pre- and post-construction photos (included in Task 8); • Monitor the recontouring of the temporarily impacted drainages (up to three visits of four hours on-site per visit); and
• Conduct a single installation monitoring visit (four hours on-site per visit including travel), to inspect the seed material and monitor seed installation.
Following mitigation installation, HELIX will prepare an as-built letter to document the completed work and start of the two-growing season (i.e., two-year) maintenance and monitoring period. The report will include a summary of the site preparation and installation activities, including any changes during implementation. The letter will also include a figure depicting the revegetation area and representative photos of the work. HELIX will provide an electronic copy of the as-built letter to Client for review prior to submittal to RWQCB. HELIX will revise the draft report based on a single set of minor comments provided by the Client. If additional or major comments/revisions are received, a contract augment will be required.
13b. Maintenance and Annual Monitoring. Following installation, a HELIX biologist will monitor maintenance activities conducted by the maintenance crews during the two-growing season maintenance and monitoring period. HELIX will conduct a total of 10 site inspections, five per growing season, during the two-growing season maintenance and monitoring period.
Maintenance monitoring will be conducted in accordance with the 2024 On-site Streambed Revegetation Plan for the Project. Maintenance monitoring visits are proposed to be conducted in January, March, May, July, and November. The timing of monitoring visits is subject to change based on weather and site conditions. Brief email documentation of observations and recommendations will be submitted to the Maintenance Contractor and Client following each monitoring visit (10 total, five per growing season).
HELIX will also conduct an annual technical monitoring visit in spring (April) of each year during the two-growing season maintenance and monitoring period. Following the annual technical monitoring each spring, HELIX will prepare an annual monitoring report. The annual report will include: photo documentation of the revegetation areas; visual estimates of percent cover of native, non-native, and invasive species; a complete list of plant and animal species observed; hydrology observations; and a summary of whether the revegetation effort is meeting the required performance standards. The reports will be submitted electronically to RWQCB annually. HELIX will submit annual monitoring reports to the Client for review prior to submittal to RWQCB. This task assumes one round of minor revisions (per report) from the Client. Major or multiple revisions may require additional authorization.
13c. Agency Sign-off. HELIX will coordinate and attend one sign-off walk with RWQCB following the completion of the final monitoring report, if necessary. This task assumes performance
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standards will be met within the two-growing season period. If the revegetation area does not meet all performance standards, the maintenance and monitoring period will be extended.
Additional authorization will be required if the maintenance and monitoring period is extended beyond two growing seasons.
Task 14 Five-Year Biological Monitoring of the MSHCP and LBVI Mitigation Areas.
14a: Installation Monitoring and Reporting. HELIX will monitor site preparation and the installation of plant and seed material in the total 3.05-acre revegetation areas identified in the 2025 Murrieta Creek Multi-Use Trail Project Habitat Mitigation and Monitoring Plan. The plan includes two separate mitigation areas: the Western Riverside County Multiple Species Habitat Conservation Plan (MSHCP) revegetation area (2.63 acres), and the least Bell’s vireo (LBVI) mitigation area (0.41 acre). The MSHCP revegetation area requires three years of maintenance and monitoring, and will include seed installation only (no container plants). The LBVI mitigation area requires five years of maintenance and monitoring, and container plants and seed will be installed along with temporary above-ground irrigation. Installation monitoring will include attending one pre-construction meeting, pre-restoration documentation (photos and hydrology and wildlife use observations), and monitoring of the site during the installation period. Specifically, HELIX will:
• Attend one pre-restoration meeting to help ensure that installation personnel understand the project requirements and limitations for both the MSHCP revegetation area and the LBVI mitigation areas;
• Inspect the marking of the project limits prior to grading of the LBVI mitigation area; and • Conduct six installation monitoring visits (up to five hours on-site per visit), to: inspect the seed and plant material prior to installation (two visits), confirm proper irrigation coverage (concurrent with plant material inspection), monitor the manner in which the material is installed (three visits), and conduct a post-installation inspection (one visit).
Following the completion of the installation, HELIX will prepare an as-built report to document the completed installation and start of the 90-day Plant Establishment Period (PEP), which starts concurrently with the three- and five-year maintenance and monitoring programs. The report will include a summary of the site preparation and installation activities, and document plant material installed including any changes during implementation. The report will also include a figure depicting the revegetation area and representative photos of the work. HELIX will provide an electronic copy of the installation report to Client to review prior to submittal to U.S. Fish and Wildlife Service, California Department of Fish and Wildlife, and Western Riverside County Regional Conservation Authority. HELIX will revise the draft report based on a single set of minor comments provided by the Client. If additional or major comments/revisions are received, a contract augment will be required.
14b. Maintenance Monitoring. A HELIX biologist will monitor maintenance activities conducted by the maintenance crews during the five-year maintenance and monitoring period, which includes the initial 90-day PEP that will run concurrently with the start of Year 1. Monitoring visits will be conducted monthly during first three months of Year 1 (three visits; i.e., during the PEP) and will be reduced to eight visits for the remainder of Years 1 through 3 each, for a total of 27 site visits between Years 1 through 3. Monitoring for Years 4 and 5 will consist of six visits each (December, January, March, May, July, and October). The timing of monitoring visits is subject to change based on weather and site conditions. Monitoring memos noting issues with
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plant establishment, non-native species, irrigation, sediment control, etc., will be provided, as necessary, to the maintenance contractor and client.
14c: Technical Monitoring. HELIX will conduct technical monitoring visits twice each year during Years 1 through 3 of the maintenance and monitoring period. During Years 4 and 5 only a single maintenance visit will be conducted for the LBVI mitigation area. The first visit (Years 1 through 3) will be conducted in the late spring (April/May) to measure the success of the MSHCP revegetation area. The second visit (Years 1 through 5) will be conducted in the LBVI mitigation area in late summer (August/September). Monitoring for the MSHCP revegetation area will be qualitative (visual only – no transects). Monitoring for the LBVI mitigation area during Years 1 and 2 will be qualitative (visual only – no transects). Monitoring for the LBVI mitigation area during Years 3 through 5 will include quantitative (assumed to be a total of three transects in LBVI mitigation area). HELIX will prepare an annual report after each technical monitoring event. The Years 1 through 3 reports will include the MSHCP revegetation area and LBVI mitigation area results while the Years 4 and 5 reports will only cover the LBVI mitigation area results. The annual reports will include botanical observations (i.e., measurements of percent cover of native and non-native species) and a summary of whether the restoration effort is progressing and meeting the required success standards. The report will also recommend remedial measures that may be required. HELIX will provide an electronic copy of the installation memo to Client to review prior to submittal to the resource agencies.
HELIX will revise the draft report based on a single set of minor comments provided by the Client If additional or major comments/revisions are received, a contract augment will be required.
14d. Agency Sign-off. HELIX will coordinate and attend one sign-off walk with resource agencies following the completion of the final monitoring report, if necessary. This task assumes performance standards will be met within the five-year maintenance and monitoring period. If the mitigation areas do not meet all performance standards, the maintenance and monitoring period will be extended. Additional authorization will be required if the maintenance and monitoring period is extended beyond five years.
Task 15 Irrigation Construction Documents. HELIX’s Landscape Architecture Group will provide construction documents for a temporary above-grade irrigation system for the 0.35-acre LBVI mitigation area per the Murrieta Creek Multi-use Trail HMMP. An irrigation point of connection has been provided at the end of Skylark Drive, which will be used for this system. The plans will include a Cover Sheet, Irrigation Plan with notes, equipment legend, and construction details.
Specifications will not be provided in the document, but relative City standards and details will be referenced reference relevant. This task does not include project meetings. If Client requests additional services that cause HELIX to exceed the time allocated for this task, additional authorization will be required.
Two rounds of consolidated Client review comments/revisions are included, and all comments will be addressed in a response table. Following approval, e-signed digital copies of the final plans will be provided to the Client for their use/records.
Task 16 Restoration/Revegetation Installation Mobilization. The HELIX management team and two- person restoration crew will attend a four-hour kick off meeting on the first day of installation implementation to review project goals with the project team (i.e. Client and restoration specialist). This day will include staging area preparation and accepting delivery of equipment including a portable restroom, storage container, ATV, etc., for use during installation.
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Task 17 RWQCB Mitigation Area Seed Installation. HELIX will install seed withing the 0.046-acre RWQCB mitigation areas. Seed will be hand broadcasted and raked into the soil. HELIX will procure seed from a reputable vendor, like S&S Seed. Seed material will be sourced as close to the project area as possible, but some commercial seed may be required for specific species. HELIX will install two pounds of seed, which is higher than the 0.72 pound listed in the plan. Two pounds of seed is required to meet the minimum ordering requirements from the S&S Seed. Half a workday with a four-person restoration crew is assumed for this task.
Task 18 RWQCB Mitigation Area Maintenance. HELIX will maintain invasive and non-native species in the 0.046-acre RWCQB mitigation area for a two-year period. Maintenance will include non- native vegetation treatment via herbicide application, hand weeding, and line trimming.
Maintenance will occur quarterly per the maintenance schedule outlined in the On-Site Streambed Revegetation Plan. A total of eight half workdays with a four-person restoration crew are assumed for this task.
Task 19 LBVI Mitigation Area Hand Watering. HELIX will conduct supplemental watering during Years 1 through 3 within the 0.35-acre LBVI mitigation area to support native plant establishment.
Watering will be performed using a hose connected to a 500-gallon water buffalo, which will be parked along the developed trail within the project. The Client will provide a hydrant with temporary water meter to fill the 500-gallon water meter. Assumes a total of 50 watering events utilizing a two-person restoration crew during Year 1 of the project.
Task 20 LBVI Mitigation Area Plant Installation. HELIX will install plants in the 0.35-acre LBVI mitigation area per the HMMP plant palette. Installation quantities include 723 one-gallon or d-40 container stock. Planting assumes flexibility in total quantities and species. HELIX will procure plant material with source locations as close to the project as possible. Placement of container plantings in the field will be coordinated with the restoration specialist. Plants will be watered during planting using a hose connected to a 500-gallon water buffalo. A total of five days with a four-person restoration crew are assumed for this task.
Task 21 LBVI Mitigation Area Seed Installation. HELIX will install seed in the 0.35-acre LBVI mitigation area per the HMMP seed palette. Up to 4.20 pounds of seed will be installed. Seed will be dispersed through the work area via hydroseed slurry consisting of 2,500 pounds of wood fiber mulch per acre and eight-pounds of ultralight tackifier per acre.
Task 22 LBVI Mitigation Area Maintenance. HELIX will control invasive and non-native species in the
0.35-acre LBVI mitigation area for a five-year period per the HMMP. Maintenance will include non-native weed control via herbicide application, hand weeding, and line trimming.
Maintenance will occur quarterly per the maintenance schedule outlined in the HMMP.
Additional maintenance visits may be warranted to meet HMMP requirements and may require an augment. During maintenance, HELIX will replace 10% of the container stock installed in Task 22, which totals 72 plants. A total of 36 workdays with a two-person restoration crew are assumed for the maintenance and planting portion of this task.
Task 23 MSHCP Revegetation Area Seed Installation. HELIX will install seed withing the 2.66-acre MSHCP revegetation area per the HMMP seed palette. Up to 71.82 pounds of seed will be installed. Seed will be dispersed through the work area via hydroseed slurry consisting of 2,500 pounds of wood fiber mulch per acre and eight pounds of ultralight tackifier per acre. HELIX will procure seed from a reputable vendor, like S&S Seed. Seed material will be sourced as close to the project area as possible, but some commercial seed may be required for specific species.
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Task 24 MSHCP Revegetation Area Maintenance. HELIX will control invasive and non-native species in the 2.66-acre MSHCP revegetation area. Maintenance will include non-native weed control via herbicide application, hand weeding, and line trimming. Maintenance will occur quarterly over the three-year maintenance period, per the maintenance schedule outlined in the HMMP.
Additional maintenance visits may be warranted to meet HMMP requirements and may require an augment. A total of 36 workdays with a four-person restoration crew are assumed for this task.
Task 25 Easement Coordination and Support. HELIX has assumed 40 hours of Senior Biology Project Manager time and eight hours of Principal Biologist time for management/meetings with the Client, Rivers and Lands Conservancy, CDFW, and other applicable agencies regarding conservation easement of the least Bell’s vireo mitigation area. If Client requests additional services that cause HELIX to exceed the time allocated for this task, additional authorization would be required.
Optional Tasks
Task 26 MSHCP Revegetation Area Hand Watering. If needed, HELIX will conduct supplemental watering during Year 1 within the 2.66-acre MSHCP revegetation area to support native plant establishment. Watering will be performed using a hoses connected to a water buffalo. Due to the configuration of the project and water pressure limitations, HELIX does not propose a temporary, automatic, and above grade overhead irrigation system within the MSHCP revegetation area. If supplemental watering is required due to poor rainfall, HELIX will conduct supplemental watering, as needed. Assumes a total of six watering events utilizing a two- person restoration crew during Year 1 of the project.
Task 27 LBVI Mitigation Area Fine Grading. If needed, HELIX will perform fine grading within the 0.35- acre LBVI mitigation area following rough grading completed by another contractor. Fine grading will be conducted using an excavator to shape, smooth, and contour the work area.
This activity will be performed to give the LBVI Mitigation Area a more organic and natural appearance prior to installation efforts. A total of three days with an operator and restoration technician are assumed for this task.
ASSUMPTIONS AND LIMITATIONS
The following additional assumptions and limitations are a material component of this Agreement. • This estimate does not include costs for water and meter. The Client is responsible for water and associated costs.
• HELIX is not responsible for the replacement or repair of the project lost or damaged due to vandalism, natural disasters (such as fire and flood), and other events and circumstances. • Erosion control and repair of erosion problems due to natural rainfall is not a part of this estimate.
• This estimate includes state prevailing wage labor rates. • Vehicle access will be permitted on the developed trail within the project area for the purposes of transporting materials, equipment, and personnel.