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Attachment D - Appendix F-2 - Geotechnical Memo RPSPA

San Marcos City Council
July 23, 2024

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Attachment D - Appendix F-2 - Geotechnical Memo RPSPA
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July 23, 2024
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San Marcos City Council
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Text extracted from the city's file for reading and search. Open the original on legistar2.granicus.com. That file is the official record.

Appendix F-2
Geotechnical Memorandum for the
Pacific Specific Plan Project Alternative

GEOTECHNICAL | ENVIRONMENTAL | MATERIALS

The Las Posas Owner LPV, LLC,
A Delaware Limited Liability Company
2235 Encinitas Boulevard, Suite 216
Encinitas, California 92024

Attention: Mr. Greg Waite

Subject: Reduced Pacific Specific Plan Project Alternative Corner of Linda Vista Drive & Los Posas Road
San Marcos, California

Dear Mr. Waite:

This memorandum (memo) presents a discussion in regard to a development plan for the

2.2 Future Development / Project Description

The Reduced Pacific Specific Plan Project Alternative consists of 299 residential units, including a

May 8, 2024
Project No. 3649-SD
subject project location. An updated project discussion, conclusions, and recommendations are presented in this memo.

mix of rowhomes, villas, and affordable units on approximately 13.3 acres of the 33.2-acre project site. This reduced project alternative includes a total of 646 parking spaces and 111,025 square feet of common open space area. 45 of the 299 total units (15% of the total) would be designated as deed-restricted affordable units ( this alternative project reserves the option to contribute to the affordable housing fund by paying the in-lieu fee). This reduced project alternative also includes landscaping, bio-retention areas, and circulation improvements. The remaining approximately 19.9 acres of the 33.2-acre project site would be preserved and restored as open space and habitat area. This reduced project alternative would have a density of approximately

8.99 dwelling units per acre, including the open space and habitat area.

As planning progresses and additional or revised plans become available, they should be provided to GeoTek for review and comment. If plans vary significantly, additional geotechnical field exploration, laboratory testing and engineering analyses may be necessary to provide specific earthwork recommendations and geotechnical design parameters for actual development plans.

5.0 Conclusions and Recommendations

5.1 General
The Reduced Pacific Specific Plan Project was compared to the findings, conclusions, and recommendations presented in GeoTek’s December 5, 2023 report and a revised report is not recommended at this time. An updated Boring Location Plan presenting the Reduce Pacific Specific Plan Project Alternative is presented as Figure 2. Future development of the property appears feasible from a geotechnical viewpoint provided that the recommendations presented in GeoTek’s referenced December 5, 2023 report are incorporated into the design, construction, and post construction phases of the project. Due to the preliminary nature of this report, supplemental geotechnical evaluations of the property are anticipated at future dates once more detailed development plans are available. Those supplemental geotechnical recommendations will supersede the preliminary recommendations provided in this report.

Closure
The opportunity to be of service is sincerely appreciated. If you should have any questions, please do not hesitate to call our office. Respectfully submitted, GeoTek, Inc. Bruce A. Hick GE 2284 Geotechnical Engineer Christopher D. Livesey CEG 2733 Principal Geologist ENCLOSURES Figure 2 – Boring Location Map
THE LAS POSAS OWNER LPV, LLC. Project No. 3649-SD Reduced Pacific Specific Plan Project Alternative May 8, 2024 Corner of Linda Vista & Las Posas, San Marcos, California Page 2

Selected References GeoTek, Inc. 2023, Reduced Pacific Specific Plan Project, Northwest Corner of Linda Vista, Drive & Los Posas Road, San Marcos, California, Project Number 3649-SD, dated December 5, 2023.

THE LAS POSAS OWNER LPV, LLC. Project No. 3649-SD Reduced Pacific Specific Plan Project Alternative May 8, 2024 Corner of Linda Vista & Las Posas, San Marcos, California Page 3 LEGEND APPROXIMATE LOCATION OF ALLUVIUMBORING & PERCOLATION TEST LOCATIONSLIMITS OF PROPERTY SANTIAGO FORMATION, CIRCLED WHERE BURIED1384 Poinsettia Avenue, Suite A Vista, California 92081The Los Posas Owner LPV, LLC Reduced Pacific Specific Plan ProjectN-NW Corner of Linda Vista Dr. & Las PosasSan Marcos, California Figure 2Boring Location Plan B-6
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P-2 PN: 3649-SDMay2024

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