HomeMy WebLinkAboutSDP 2021-0029; IONIS LOTS 21 AND 22; ADDITIONAL INFORMATION REQUESTED BY CITY OF CARLSBAD; 2023-02-21Project No. 06442-32-31A
February 21, 2023
Ionis Pharmaceuticals, Inc.
2855 Gazelle Court
Carlsbad, California 92010
Attention: Mr. Wayne Sanders
Subject: ADDITIONAL INFORMATION REQUSTED BY CITY OF CARLSBAD
IONIS PHARMACEUTICALS LOTS 21 AND 22
(CARLSBAD OAKS NORTH BUSINESS PARK)
CARLSBAD, CALIFORNIA
References: 1. Response to City of Carlsbad Review Comments, Ionis Pharmaceuticals Lots 21 and 22
(Carlsbad Oaks North Business Park), Carlsbad, California, prepared by Geocon
Incorporated, dated January 23, 2023.
2. City of Carlsbad Review Comments, Ionis Lots 21 & 22, Carlsbad Oaks North Business
Park (1st review), Project ID: SDP2021-0029, Memorandum dated December 7, 2022.
3. Update Geotechnical Report, Ionis Lots 21 and 22 (Carlsbad Oaks North Business
Park), Carlsbad, California, prepared by Geocon Incorporated, dated October 19,
2021 (Project No. 06442-32-31A).
Dear Mr. Sanders:
In accordance with the request of Mr. Jon Olhson with DGA Planning/Architecture/Interiors, we are
providing additional information requested by City of Carlsbad. The following is our responses to the
information requested:
Based on information presented in Reference No. 3, and in general conformance with
Occupation Safety and Health Act (OSHA) Trenching and Excavation Safety, the site soils may
be considered Soil Type B. The soil type should be revised to Soil Type C if seeps are
encountered along the face of excavations. In accordance with OSHA, it is the responsibility of
the contractor and their competent person to determine the soil type during construction to
ensure all excavations, temporary slopes and trenches are properly constructed and maintained
in accordance with applicable OSHA guidelines, in order to maintain safety and the stability of
the excavations and adjacent improvements.
We anticipate the soils at pad grade for the office/R&D building will consist of materials with
expansion potential (EI) less than 20.
GEOCON
INCORPORATED
G E OT E CHN I CAL ■E NV I RONMENTA L ■ MA T ER I A L S
6960 Flanders Drive ■ Son Diego, California 92121-297 4 ■ Telephone 858.558.6900 ■ Fax 858.558.6159
Project No. 06442-32-31A - 2 - February 21, 2023
The Newport-Inglewood and Rose Canyon Fault zones, located approximately 8 miles west of
the site, are the closest known active faults.
We will perform the following services during grading and improvement construction:
a)Testing and observation services on a full-time basis during grading operations and
construction of the planned soil nail wall.
b)Check the foundation excavations for parking garage, office/R&D building, and retaining
walls prior to placement of rebar and concrete.
c)Testing and observation services on a requested basis during trench backfill, wall backfill
and construction of surface improvements.
As presented in Reference No. 3, we prepared the project update geotechnical report based on
information obtained from the geotechnical reports titled Final Report of Testing and
Observation Services During Site Grading, Carlsbad Oaks North Business Park – Phase 2
(Phase 2 – Lots 13 through 19; Phase 3 – Lots 20 through 25 and 27), Carlsbad, California,
prepared by Geocon Incorporated, dated December 11, 2007 (Geocon Project No. 06442-32-
13) and Update Geotechnical Investigation, Carlsbad Oaks North Business Park and Faraday
Avenue Offsite, Carlsbad, California, prepared by Geocon Incorporated, dated October 21, 2004
(Geocon Project No. 06442-32-03).
Should you have any questions regarding this letter, or if we may be of further service, please contact
the undersigned at your convenience.
Very truly yours,
GEOCON INCORPORATED
Emilio Alvarado
RCE 66915
EA:am
(e-mail) Addressee