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Home My WebLink AboutCT 2018-0002; AVIARA APARTMENTS; GEOTECHNICAL ADDENDUM AND REVIEW OF PUBLIC IMPROVEMENT CONSTRUCTION PLANS; 2022-03-24 GEOTECHNICAL | ENVIRONMENTAL | MATERIAL March 24, 2022 Project No. 3740-SD Wermers Companies 5120 Shoreham Place, Suite 150 San Diego, California 92122 Attention: Mr. Austin Wermers Subject: Geotechnical Addendum and Review of Public Improvement Construction Plans Public Improvements Along Laurel Tree Lane Aviara Apartments Development 6145 Laurel Tree Lane, Carlsbad, California 92009 Reference: GeoTek, Inc., “Geotechnical Evaluation Report, Aviara Apartments Development, 6145 Laurel Tree Lane, Carlsbad, California 92009,” PN 3740-SD, dated November 11, 2021 Geosoils, Inc. “Preliminary Geotechnical Evaluation, 9.2 Acres, APN 212-040-56- 00, Laurel Tree Lane At Aviara Parkway, Carlsbad, San Diego County, California, W.O. 7103-A-SC, dated July 7, 2016. SB&O, Inc, 2022, (Public) Improvement and Grading Plans For: Aviara Apartments, Project Number CT2018-0002, Drawing 535-1, 18 Sheets, print date March 21, 2022 Dear Mr. Wermers: As requested, GeoTek, Inc. (GeoTek) has completed a geotechnical review of the referenced construction plans with consideration of GeoTek’s and Geosoils, Inc. geotechnical reports to provide remedial grading recommendations for the offsite public improvements for the subject site. GeoTek performed a geotechnical evaluation specific to the western portion of the County of San Diego’s assessor’s parcel number, which is bisected from the east by Aviara Parkway. It is GeoTek’s understanding that Aviara Parkway and Laurel Tree Lane were constructed with geotechnical guidelines similar to current practices, as the grading ordinances for the City of Carlsbad and industry practice have not changed considerably. Furthermore, the roadway embankment fills have been accepted by the City of Carlsbad. WERMERS COMPANIES Project No. 3740-SD Public Improvements Along Laurel Tree Lane March 24, 2022 Aviara Apartments, 6145 Laurel Tree Lane, Carlsbad, California Page 2 Although the road and existing embankment fills have been observed to be in good condition, remedial grading for support of new embankment fills should be performed prior to construction of the embankments and proposed improvements on the east parcel. Based on Geosoils 2016 report for the eastern side of the parcel, all alluvium and the upper weathered bedrock was considered to be unsuitable to support settlement-sensitive improvements. In preparation for the public improvements to be constructed prior to private improvements being constructed, remedial grading of the fills should be performed to avoid unnecessary setbacks or deepened foundations, or reduce the potential depth of deepened foundations. Geosoils’ recommended remedial grading for the eastern parcel on the order of 17 feet below the ground surface. Laboratory data within the Geosoils report is sparse, provided additional data is obtained during remedial grading that support reduced depths of remedial grading, more shallow removals may be warranted, without the recommendation for deepened foundations or setbacks of foundations. Based on this review, it is GeoTek’s opinion that the provided and reviewed plans have been prepared utilizing the soil engineering design parameters and recommendations provided in the referenced reports. These plans are considered to be geotechnically suitable. GeoTek, Inc. makes no representation as to the accuracy of dimensions, calculations, or structural/civil design provided on the referenced plans. Should you have any questions after reviewing this addendum, please feel free to contact our office at your convenience. Respectfully submitted, GeoTek, Inc. Christopher D. Livesey CEG, 2733 Exp. 05/31/23 Associate Vice President Bruce A. Hick GE, 2284 Exp. 12/31/22 Geotechnical Engineer GEOTECHNICAL | ENVIRONMENTAL | MATERIAL May 6, 2022 Project No. 3740-SD Wermers Companies 5120 Shoreham Place, Suite 150 San Diego, California 92122 Attention: Mr. Austin Wermers Subject: Response to Geotechnical Review Comments and Second Review of Public Improvement Construction Plans Public Improvements Along Laurel Tree Lane Aviara Apartments Development 6145 Laurel Tree Lane, Carlsbad, California 92009 Reference: See Page 3 Dear Mr. Wermers: As requested, GeoTek, Inc. (GeoTek) has prepared this letter to respond to City of Carlsbad 3rd party (Heatherington Engineering, Inc.) geotechnical review comments and to provide a second geotechnical review of the referenced construction plans with consideration of GeoTek’s and Geosoils, Inc. geotechnical reports and recommendations. The second plan review includes geotechnical commentary regarding City of Carlsbad plan review comments by MBI. Copies of both Heatherington’s and MBI’s review comments are included in Appendix A. Review Comment It appears preliminary public works (street grading and pavement) recommendations were provided in Reference 1. The Consultant should review the project improvement and grading plans (Reference 5), provide any additional and/or updated geotechnical recommendations considered necessary, and confirm that the plans have been prepared in accordance with the geotechnical recommendations (Heatherington, 2022). Response to Review Comment Reference 1 (Geosoils, 2016) provided preliminary pavement design/construction recommendations for private streets. GeoTek understands that the private street recommendations provided in Geosoils’ report do not apply to proposed public street improvements. The preliminary street structural sections noted in Geosoils’ report and plans WERMERS COMPANIES Project No. 3740-SD Public Improvements Along Laurel Tree Lane May 6, 2022 Aviara Apartments, 6145 Laurel Tree Lane, Carlsbad, California Page 2 are preliminary and final pavement design will be provided once the proposed embankment fills have reached rough grade elevations. A representative sample of the subgrade material can be performed and final recommendations can be provided. Remedial grading recommendations were provided in Geosoils’ report that encompassed both the east and west side of the Aviara Apartment project. The report was reviewed by GeoTek and a supplemental evaluation for the west portion of the parcel was performed to address recommendations provided by Geosoils. It should be noted that Geosoils recommended all road embankment fills be removed and recompacted. This recommendation was provided without evaluation of the consistency of the embankment fills. As part of GeoTek’s evaluation (GeoTek, 2021), public records were requested regarding geotechnical information for the construction of Aviara Parkway. The records request returned a preliminary soils report for the construction of Aviara Parkway, however, an as-graded soils report was not provided. During construction of Aviara Parkway a private driveway with an embankment was constructed on the project site. The private driveway embankment was evaluated as part of GeoTek’s 2021 report. GeoTek’s conclusion with regards to the embankment fills was that the existing fill was found to be suitable to support the proposed improvements provided the upper two feet of the driveway’s subgrade was reprocessed. As the embankment fills for Aviara Parkway were apparently accepted by the City of Carlsbad following construction, and inference by association can be drawn from the embankment fill evaluation, as well as the lack of evidence of low compacted fills, it was GeoTek’s conclusion in our 2022 addendum and plan review letter that the proposed improvements are geotechnically suitable. No further recommendations are deemed necessary. Plan Review GeoTek performed a review of the referenced S.B. & O plans. Detail A/8 noted Stalite structural soil be constructed within the tree basin BMPs. GeoTek has reviewed the properties of Stalite and conclude that Stalite is geotechnically suitable to support the proposed improvements. Based on this review, it is GeoTek’s opinion that the provided and reviewed plans have been prepared utilizing the soil engineering design parameters and recommendations provided in the referenced reports. These plans are considered to be geotechnically suitable. GeoTek, Inc. makes no representation as to the accuracy of dimensions, calculations, or structural/civil design provided on the referenced plans. WERMERS COMPANIES Project No. 3740-SD Public Improvements Along Laurel Tree Lane May 6, 2022 Aviara Apartments, 6145 Laurel Tree Lane, Carlsbad, California Page 3 Should you have any questions after reviewing this addendum, please feel free to contact our office at your convenience. Respectfully submitted, GeoTek, Inc. Attachments: Heatherington’s Comments and GeoTek’s 2022 Letter References Geosoils, Inc. “Preliminary Geotechnical Evaluation, 9.2 Acres, APN 212-040-56-00, Laurel Tree Lane At Aviara Parkway, Carlsbad, San Diego County, California, W.O. 7103-A- SC, dated July 7, 2016. GeoTek, Inc., 2021, “Geotechnical Evaluation Report, Aviara Apartments Development, 6145 Laurel Tree Lane, Carlsbad, California 92009,” PN 3740-SD, dated November 11, 2021 , 2022, “Geotechnical Addendum and Review of Public Improvement Construction Plans, Public Improvements Along Laurel Tree Lane, Aviara Apartments Development, 6145 Laurel Tree Lane, Carlsbad, California 92009”, PN 3740-SD, dated March 24, 2022. Heatherington Engineering, Inc, 2022, “Third-Party Geotechnical Review (First), Aviara Apartments, Public Improvements – Aviara Parkway & Laurel Tree Lane, Carlsbad, California, Project ID: CT2018-0002, ROW2021-0976, Heatherington’s Project No. 9680.1 Log No. 21866, dated April 29, 2022. MBI, 2022, Third Plan Check Review, that includes GeoTek’s Referenced 2022 Letter, Comments noted on Letter. SB&O, Inc, 2022, (Public) Improvement and Grading Plans For: Aviara Apartments, Project Number CT2018-0002, Drawing 535-1, 18 Sheets, print date May 3, 2022. Christopher D. Livesey CEG, 2733 Exp. 05/31/23 Associate Vice President Bruce A. Hick GE, 2284 Exp. 12/31/22 Geotechnical Engineer Appendix A April 29, 2022 Project No. 9680.1 Log No. 21866 City of Carlsbad Land Development Engineering 1635 Faraday Avenue Carlsbad, California 92008-7314 Attention: Ms. Allison McLaughlin Subject: THIRD-PARTY GEOTECHNICAL REVIEW (FIRST) Aviara Apartments Public Improvements – Aviara Parkway & Laurel Tree Lane Carlsbad, California Project ID: CT2018-0002, ROW2021-0976 References: Attached Dear Ms. McLaughlin: In accordance with your request, Hetherington Engineering, Inc. has provided third-party geotechnical review of References 1 through 4. The following comment is provided for analyses and/or response by the Geotechnical Consultant. It appears preliminary public works (street grading and pavement) recommendations were provided in Reference 1. The Consultant should review the project improvement and grading plans (Reference 5), provide any additional and/or updated geotechnical recommendations considered necessary, and confirm that the plans have been prepared in accordance with the geotechnical recommendations. The opportunity to be of service is sincerely appreciated. If you have any questions regarding this review, please contact this office at your convenience. Sincerely, HETHERINGTON ENGINEERING, INC. Mark D. Hetherington Paul A. Bogseth Civil Engineer 30488 Professional Geologist 3772 Geotechnical Engineer 397 Certified Engineering Geologist 1153 (expires 3/31/24) Certified Hydrogeologist 591 (expires 3/31/24) Distribution: 1-via e-mail (Allison.McLaughlin@carlsbadca.gov) 1-via e-mail (LDEtrackingdesk@carlsbadca.gov) SOIL & FOUNDATION ENGINEERING ENGINEERING GEOLOGY HYDROGEOLOGY (760) 931-1917 Fax (760) 931-0545 333 Third Street Laguna Beach, CA 92651 (949) 715-5440 Fax (949) 715-5442 Carlsbad, CA 92008-43695365 Avenida Encinas, Suite A HETHERINGTON ENGINEERING, INC. www.hetheringtonengineering.com REFERENCES Project No. 9680.1 Log No. 21866 1. “Preliminary Geotechnical Evaluation, 9.2 Acres, APN 212-040-56-00, Laurel Tree Lane at Aviara Parkway, Carlsbad, San Diego County, California,” by GeoSoils, Inc., dated July 7, 2016. 2. “Revised Infiltration Recommendations, West Portion of APN 212-040-56-00, West of Laurel Tree Lane at Aviara Parkway, Carlsbad, San Diego County, California,” by GeoSoils, Inc., dated May 16, 2017. 3. “Geotechnical Considerations Regarding Raised Site Elevations, Aviara Parkway, 6145 Laurel Tree Road (East and West), Carlsbad, San Diego County, California 92011,” by GeoSoils, Inc., dated March 26, 2018. 4. “Supplemental Geotechnical Recommendations, Walls, and BMP Basins, Daylight Lines, Proposed Aviara Apartments, Laurel Tree Lane at Aviara Parkway, Carlsbad, San Diego County, California,” by GeoSoils, Inc., dated July 11, 2018. 5. “Improvement and Grading Plans for: Aviara Apartments, 6145 Laurel Tree Road, Carlsbad, CA, 92011,” by SB&O, Inc., dated March 25, 2022 (17-Sheets). HETHERINGTON ENGINEERING, INC. GEOTECHNICAL | ENVIRONMENTAL | MATERIAL March 24, 2022 Project No. 3740-SD Wermers Companies 5120 Shoreham Place, Suite 150 San Diego, California 92122 Attention: Mr. Austin Wermers Subject: Geotechnical Addendum and Review of Public Improvement Construction Plans Public Improvements Along Laurel Tree Lane Aviara Apartments Development 6145 Laurel Tree Lane, Carlsbad, California 92009 Reference: GeoTek, Inc., “Geotechnical Evaluation Report, Aviara Apartments Development, 6145 Laurel Tree Lane, Carlsbad, California 92009,” PN 3740-SD, dated November 11, 2021 Geosoils, Inc. “Preliminary Geotechnical Evaluation, 9.2 Acres, APN 212-040-56- 00, Laurel Tree Lane At Aviara Parkway, Carlsbad, San Diego County, California, W.O. 7103-A-SC, dated July 7, 2016. SB&O, Inc, 2022, (Public) Improvement and Grading Plans For: Aviara Apartments, Project Number CT2018-0002, Drawing 535-1, 18 Sheets, print date March 21, 2022 Dear Mr. Wermers: As requested, GeoTek, Inc. (GeoTek) has completed a geotechnical review of the referenced construction plans with consideration of GeoTek’s and Geosoils, Inc. geotechnical reports to provide remedial grading recommendations for the offsite public improvements for the subject site. GeoTek performed a geotechnical evaluation specific to the western portion of the County of San Diego’s assessor’s parcel number, which is bisected from the east by Aviara Parkway. It is GeoTek’s understanding that Aviara Parkway and Laurel Tree Lane were constructed with geotechnical guidelines similar to current practices, as the grading ordinances for the City of Carlsbad and industry practice have not changed considerably. Furthermore, the roadway embankment fills have been accepted by the City of Carlsbad. WERMERS COMPANIES Project No. 3740-SD Public Improvements Along Laurel Tree Lane March 24, 2022 Aviara Apartments, 6145 Laurel Tree Lane, Carlsbad, California Page 2 Although the road and existing embankment fills have been observed to be in good condition, remedial grading for support of new embankment fills should be performed prior to construction of the embankments and proposed improvements on the east parcel. Based on Geosoils 2016 report for the eastern side of the parcel, all alluvium and the upper weathered bedrock was considered to be unsuitable to support settlement-sensitive improvements. In preparation for the public improvements to be constructed prior to private improvements being constructed, remedial grading of the fills should be performed to avoid unnecessary setbacks or deepened foundations, or reduce the potential depth of deepened foundations. Geosoils’ recommended remedial grading for the eastern parcel on the order of 17 feet below the ground surface. Laboratory data within the Geosoils report is sparse, provided additional data is obtained during remedial grading that support reduced depths of remedial grading, more shallow removals may be warranted, without the recommendation for deepened foundations or setbacks of foundations. Based on this review, it is GeoTek’s opinion that the provided and reviewed plans have been prepared utilizing the soil engineering design parameters and recommendations provided in the referenced reports. These plans are considered to be geotechnically suitable. GeoTek, Inc. makes no representation as to the accuracy of dimensions, calculations, or structural/civil design provided on the referenced plans. Should you have any questions after reviewing this addendum, please feel free to contact our office at your convenience. Respectfully submitted, GeoTek, Inc. Christopher D. Livesey CEG, 2733 Exp. 05/31/23 Associate Vice President Bruce A. Hick GE, 2284 Exp. 12/31/22 Geotechnical Engineer