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Home My WebLink AboutCT 2018-0002; AVIARA APARTMENTS WEST; GEOTECHNICAL CORROSION MEMO; 2023-07-14 GEOTECHNICAL | ENVIRONMENTAL | MATERIAL July 14, 2023 Project No. 3740-SD R&V Real Estate Services c/o Wermers Companies 5120 Shoreham Place, Suite 150 San Diego, California 92122 Attention: Mr. Austin Wermers Subject: Geotechnical Update Review of Precise Grading Plans - Delta A Aviara Apartments West 1205 Aviara Parkway, Carlsbad, California 92009 Reference: GeoTek, Inc., “Geotechnical Evaluation Report, Aviara Apartments Development, 6145 Laurel Tree Road, Carlsbad, California 92011,” PN 3740-SD, dated November 11, 2021 GeoTek, Inc., “Review – On-site Stormwater Disposal and Retaining Wall Design, Aviara Apartments Development, 6145 Laurel Tree Road, Carlsbad, California 92011,” PN 3740-SD, dated August 18, 2022 SB&O, Inc. “Precise Grading Plans for: Aviara Apartments West,” Delta A, dated April 7, 2023. Dear Mr. Wermers: As requested, GeoTek, Inc. (GeoTek) has completed a geotechnical review of the referenced precise grading construction plans. The plans were reviewed on November 30, 2022. Since then, the plans were revised as Delta A (4, 5 15, 19A, 20A, 23) to incorporate an underground detention pipe system designed by Contech Engineered Solutions, LLC to replace the precast concrete underground vault designed by StormTrap. The underground pipe system is a corrugated metal pipe (CMP) that is polymer coated. The polymer coating is designed for pH environments ranging from 3 to 11 and minimum resistivity of 250 ohm-cm or greater with an unlimited maximum resistivity limit. Table 1 summarizes the design environment provided by the manufacturer. GeoTek, Inc. 1384 Poinsettia Avenue, Suite A Vista, CA 92081-8505 (760) 599-0509 Offic, (760) 599-0593 Fa: www.geotekusa.com R&V REALESTATE July 14, 2023 Updated Precise Grading Plan Review Delta A Project No. 3740-SD Aviara Apartments West, Carlsbad, California Preliminary corrosion test results indicate that site soils exhibit minimum resistivity (938 ohm- cm)and pH values (8.0 – 8.5) within the range of the polymer coated CMP design. Laboratory test results are presented in Appendix A. Confirmation corrosion testing of the material to be backfilled around the CMP should be performed prior to placement of backfill to confirm the corrosion environment is within the design environment of the CMP design. 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 as well as the Corrugated Metal Pipe Design Guide prepared by Contech Engineered Solutions. These plans are considered to be geotechnically suitable. GeoTek 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. 05/31/25 Vice President Edwin R. Cunningham RCE 81687, Exp. 03/31/24 Project Engineer Material Type Galvanized Steel* Aluminized Steel Type 2 (ALT2) Polymer Coated Aluminum Alloy 3 Table 1 -Recommended Environments Soil* and Water pH 4 5 6 7 8 9 10 11 * Appropriate pH range for Galvanized Steel is 6. 0 to I 0 GEOTEK Resistivity (ohm-cm) 12 Minimum Maximum 2,000 10,000 1,500 N/A 250 N/A 500 N/A R&V REALESTATE July 14, 2023 Updated Precise Grading Plan Review Delta A Project No. 3740-SD Aviara Apartments West, Carlsbad, California APPENDIX A GEOTEK Project X REPORT S211011A Corrosion Engineering Page 1 Corrosion Control – Soil, Water, Metallurgy Testing Lab 29990 Technology Dr, Suite 13, Murrieta, CA 92563 Tel: 213-928-7213 Fax: 951-226-1720 www.projectxcorrosion.com Results Only Soil Testing for Aviara Apartments October 13, 2021 Prepared for: Chris Livesey GeoTek, Inc. 1384 Poinsettia Ave, Suite A Vista, CA, 92081 clivesey@geotekusa.com Project X Job#: S211011A Client Job or PO#: 3740-SD Respectfully Submitted, Eduardo Hernandez, M.Sc., P.E. Sr. Corrosion Consultant NACE Corrosion Technologist #16592 Professional Engineer California No. M37102 ehernandez@projectxcorrosion.com No. lMG7102 Project X REPORT S211011A Corrosion Engineering Page 2 Corrosion Control – Soil, Water, Metallurgy Testing Lab 29990 Technology Dr., Suite 13, Murrieta, CA 92563 Tel: 213-928-7213 Fax: 951-226-1720 www.projectxcorrosion.com Soil Analysis Lab Results Client: GeoTek, Inc. Job Name: Aviara Apartments Client Job Number: 3740-SD Project X Job Number: S211011A October 13, 2021 Method ASTM D4972 ASTM G200 ASTM D4658 ASTM D4327 ASTM D6919 ASTM D6919 ASTM D6919 ASTM D6919 ASTM D6919 ASTM D6919 ASTM D4327 ASTM D4327 Bore# / Description Depth pH Redox Sulfide S2- Nitrate NO3- Ammonium NH4+ Lithium Li+ Sodium Na+ Potassium K+ Magnesium Mg2+ Calcium Ca2+ Fluoride F2-- Phosphate PO43- (ft)(mg/kg)(wt%)(mg/kg)(wt%)(Ohm-cm)(Ohm-cm)(mV)(mg/kg)(mg/kg)(mg/kg)(mg/kg)(mg/kg)(mg/kg)(mg/kg)(mg/kg)(mg/kg)(mg/kg) B-1, BB-1 Light Brown Silty Sand with Gravel 0-10 299.4 0.0299 256.6 0.0257 6,164 938 8.5 164 0.20 240.0 3.9 ND 434.5 24.5 0.6 6.8 8.8 0.3 B-4, BB-1 Dark Brown Silty Sand with Clay 5-10 64.8 0.0065 59.7 0.0060 19,430 3,350 8.0 160 1.08 23.5 0.9 0.01 172.8 12.5 133.1 311.2 7.0 3.8 ASTM G187 ASTM D4327 ASTM D4327 Resistivity As Rec'd | Minimum Sulfates SO42- Chlorides Cl- Cations and Anions, except Sulfide and Bicarbonate, tested with Ion Chromatography mg/kg = milligrams per kilogram (parts per million) of dry soil weight ND = 0 = Not Detected | NT = Not Tested | Unk = Unknown Chemical Analysis performed on 1:3 Soil-To-Water extract PPM = mg/kg (soil) = mg/L (Liquid) I 2 3 4 s 6 7 R 9 10 II 12 13 14 IS Lab Request Sheet Chain of Custody Phone: (213) 928-7213 • Fax (951) 226-1720 • www.projcctxcorrosion.com Project X Corrosion Engineering 1 ,on,..,t1'1't ( ,,,11rnl • ""Otl. W11k"r. and \ltu llu1t:, I .o" Ship Samples To: 29990 Technology Dr, Suite 13, Murrieta, CA 92563 ProjectXJobNumbe:_g. 2//01/ A-Geofe.t J71to-~J> A Y/q fa.. /. ld. 2 fu_ IMPORTANT: Please complete Project and Sample Identification Data as you would like it to appear In report & nclude this form with samples. Company Name: GeoTek, Inc. Contact Name: Chris Livesey Phone No: 949-338-9233 Mailing Address: 1384 Poinsettia Ave, Ste A, Vista, CA 92081 Contact Email: clivesey@geotekusa.com Accounting Contact: Accounts Payable Invoice Email: ap@geotekusa.com; lwhite@geotekusa.com Client Project No: 3740-SD Project Name: Aviara Aparments J Day 2AHr P.O.#: J-5 Day Guanialct RUSH ANALYSIS REQUESTED (Please circle) Stlnchrd so~• mart-up 100%mart.._.p t/ □ ~i ~i -~ •N "' g ;t CN ., (Business Days) Turn Around Time: !~ . ~ -a. <8 ct Jt ~~ a -g .!: g~ 0 h g_ :c 8 ~ ~ ~ .... ~ "' .., 0: ~ Results By: □ Phone □ Fax O Email ~~ ~~ :z: ~ ::q~ ?. ~ ::=: ~ u,N V) ~ "'g tn ! .5 "' 3:: < I-~ I-< I-E -o < < ~ '.::!: ., C: -· ~ .. -~ g ., Default ~~ ., -~E. ~ E. ~~ ~i ~i ~E ~~ :.!~ ~~ ::;:~ ~~ ::;:~ ~~ er !;Ji e;; Date & Received by : .... ~ ~~ ~g .... ~ .... ~ ~ ~~ ~o ~o ~o ~o n ~8 n ~N Method < 0 <o < 0 < i3 ti • <O Sl!t>c.'lal lns1ru1:1ion5: Fun Corrosion Serrin Reports "' "' ·;;; ., "' >, Geo Quad ·c: "' -;;; 0, c >, Cl) -;;; C: t: c c :j -< C: 08. C >< ~ ·;; c -< >< ,,, c 0 .':! ., " g "' ·;;; ·-" ·;;; C: :s "0 " :~ c -~ ~ -;;; "0 C C .':! § 0 t: 0 .s .s B E t: u -;;; " " " "E -~ " " E " 0 C 0 0:: "cl, a 0 -;; -~ C 0 t: .9 0 0.. l':! -"' .. ~ " "' " 0. 'c: " a ::, E 0 u u 0, :;;: -;;; E .:! ::c: 0, .':! "0 " 0 B 'tl ..c a ·;;; " .0 0 -.. 0:: £1 " ·c: u:i 0:: ·.:: >< "0 ·.:: 0.. ;:; ::, .. u ~ E 0 .. <l: 0 E g ::, "' C ·u "' :i "'·--;;; ] 0J) -"' " 0 ,;:: ::, "' :s :a "' 0J) -;;; u.. DATE "0 E 0 u -C ·o " C: " -;; SAMPLE ID -BORE# DF.SCRll'TIO1' DEPTH(O) ·o :i :a :i 0 0 "' -;;; ti. ·o > "'·-0 " 0:: COLLECTED ::c: ~ i ..c :::l 0 ::E ai ?; '.::!: '.::!: ..c ::E "' ::, ?; Cl) 0.. <ll u Cl) < ~ 0. <ll 0. u Cl) tlJ I-I-...J 0. X B-1 , BB-1 Light Brown Silty Sand with Gravel 0-10' 10/8/21 X B-4, BB-1 Dark Brown Silty Sand with Clay 5-10' 10/8/21 X