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Home My WebLink AboutCDP 2020-0001; PATEL RESIDENCE; RESPONSE TO THIRD PARTY GEOTECHNICAL REVIEW FOR PROPOSED TWO-STORY RESIDENCE WITH BASEMENT GARAGE; 2021-02-17Mr. Rajesh Patel 3170 Vista Way EAST COUNTY SOIL CONSULTATION AND ENGINEERING, INC. 10925 HARTLEY ROAD, SUITE "I" SANTEE, CALIFORNIA 92071 TEL. 619-258-7901 Oceanside, California 92056 February 17, 2021 Project No. 19-l 126G3 Subject: Response to Third-Party Geotechnical Review for Proposed Two-Story Residence with Basement Garage 5462 Carlsbad Boulevard Carlsbad, California 92008 Reference: • Third Party Geotechnical Review (Third) for Proposed Single Family Residence, Carlsbad Boulevard, Carlsbad, California, Project No. ID: CDP 2020-0001 , by Hetherington Engineering Inc, dated January 25, 2021 Dear Mr. Patel: In accordance with your request, we have prepared this letter in response to the subject third- party geotechnical review by Hetherington Engineering, Inc. Comment Nos. 1 and 2 Please find attached (Figures No. 2 and 3) showing an updated geotechnical map/plot plan and geologic cross sections. Comment No. 3 It is our opinion that the proposed grading and construction will not adversely impact the adjacent properties or improvements. Comment Nos. 4 and 5 Proposed driveway and exterior concrete slabs should be at least 5 inches thick and reinforced with No. 4 rebars spaced at 18 inches on centers in two directions and placed at mid-height in the slab. Exterior slabs should be supported on the exisitssng souls scarified to a depth of 6 to 8 inches inches, moisture condititoned and compacted to at least 90 percent relative compaction. Driveway and exterior slabs should be provided with construction joints spaced no more than 1 O feet apart to minimize shrinkage cracking. Slab concrete should have a minimum compressive Response to Third-Party Geotechnical Review for Proposed Two-Story Residence with Basement Garage 5462 Carlsbad Boulevard Carlsbad, California 92008 Page 2 February 17, 2021 Project No. 19-1126G3 strength of 3,000 psi and maximum water-cement ratio of 0.5 to minimize shrinkage cracking. No special testing of concrete is necessary. Some shrinkage cracking is still possible. Comment No. 6 An allowable passive pressure for foundations of 300 pounds per cubic foot may be used. Section 1806.2 of the 2019 CBC allows 400 pcffor sedimentary rock. Comment No. 7 Corrosivity tests were performed on a representative sample of the onsite soils. The attached test results (Figure 4) indicate a low degree of corrosivity. Accordingly, we recommend Type I/II Portland Cement for foundation construction. Comment No. 8 The project geotechnical engineer or engineer's representative should receive advance notice to provide the necessary intermittent fieled observations and compaction testing during site development. Comment No. 9 The attached Figure 1 provides an updated list of references. This opportunity to be of service is appreciated. If you have any questions, or we can be of further service, please do not hesitate to call or contact us . This opportunity to be of service is appreciated. If you have any questions, or we can be of further service, please do not hesitate to call or contact us. Respectfully Submitted, Martin R. Owen, PE, GE Geotechnical Engineer Attachments: Figures 1 through 4 EAST COUNTY son, CONSULTATION AND ENGINEERING, INC. Response to Third-Party Geotechnical Review for Proposed Two-Story Residence with Basement Garage 5462 Carlsbad Boulevard Carlsbad, California 92008 FIGURE 1 REFERENCES Page 6 February 17, 2021 Project No. 19-1126G3 1. "2019 California Building Code, California Code of Regulations, Title 24, Part 2, Volume 2 of 2", Published by International Code Council. 2. "Grading Plans for Patel Residence-Terramar, Carlsbad Boulevard, Project No. CDP 2020-0001, Drawing No. 526-6A, Prepared by BHA, Inc. Land Planning, Civil Engineering, Surveying, Undated. 3. "Response to Third-Party Geotechnical Review for Proposed Single-Family Residence with Basement Garage, 5462 Carlsbad Boulevard, California 92008, Project No. I 9-l 126G3, Prepared by East County Soil Consultation and Engineering, Inc., Dated January 13, 2021. 4. "Review of Grading Plans and Supplemental Geotechnical Recommendations, Proposed Single- Family Residence, 5462 Carlsbad Boulevard, California 92008, Project No. I 9-l l 26G3, Prepared by East County Soil Consultation and Engineering, Inc., Dated November 11, 2020. 5. "Review of Foundation Drawings, Plans and Details for Proposed Single-Family Residence, Carlsbad Boulevard, APN 210-115-08, Project No. I 9-l l 26G3, Prepared by East County Soil Consultation and Engineering, Inc., Dated October 24, 2020. 6. "Response to EsGil Review, Proposed Single-Family Residence, 5462 Carlsbad Boulevard, Carlsbad, California 92008", EsGil plan Check No. PC2020-0040, Project No. I 9-l l 26G3, Prepared by East County Soil Consultation and Engineering, Inc., dated October 17, 2020. 7. Updated Report of Geotechnical Investigation for Proposed Single-Family Residence (Patel Residence), 5462 Carlsbad Boulevard, APN 210-115-08, Carlsbad, California 92008, Project No. 19- l 126G3, Prepared by East County Soil Consultation and Engineering, Inc., Dated January 12, 2021. EAST COUNTY SOIL CONSULTATION AND ENGINEERING, INC. Second Response to Third-Party Geotechnical Review for Proposed Two-Story Residence with Basement Garage 5462 Carlsbad Boulevard Carlsbad, California 92008 FIGURE2 GEOTECHNICAL MAP --a .. ~"'-I . Page4 February 14, 2021 Project No. 19-1126G3 "' ~ .... 1.. I . 2>-0.58 ;3 f-In kl i~ ... ~ l R·dim··1:;E--.:.;.i;~l:."iffiJA:IJ"16t Cb ~~!i6t 57..JD F.f:' £! _ ~;;,:;; ~ 415.55 I,< -: ~u ~ _;; ~ t . , .... ~ ,:-~~· ' .. .,!.., l r•.z I A-Pr,kO)(IMA'rc. ~A1/'1oN 0r '%9r n -r- Qt te,eMCe ~/-r5 ---£/#/rs OF ~WG- EAST COUNTY SOIL CONSULTATION AND ENGINEERING, INC. '70 bo Second Response to Third-Party Geotechnical Review for Proposed Two-Story Residence with Basement Garage Page5 February 14, 2021 Project No. 19-l 126G3 5462 Carlsbad Boulevard Carlsbad, California 92008 {54 - - ~ II Sl!C'J,'[QN: "B-B• SCALE: HORJZ. r•-m• ~r. 1·=ro· ---- FIGURE3 GEOLOGIC CROSS-SECTIONS " 'I ... l _; .,_ ~· 80 . ·- 70 ,= ,. ,. ~ ..:,"lft .f:>;&; ... ... ·-.•• 60 ---- -···· -50 . -- ·- • Tt.llPO!?ARY ~Rli'Ci!t CIITS ro,., Jl.«lMfiM ors· MA.Y IJ£ CCWSTRJJC7E!1 IN N47tli~A, SD.I.LS. A,{Y !DIPORl<.llY curs fJE:'fCh'O s' S.'tAI.L 8£ t:XCAVA~.:I AT A 0. ~; I PfR CEOiEcmiJl',J,1, RE:C04/MOOA110NS 1£.l'lB'r OA 1Eli 01/JJfi1. C,.RP.5~ -5"~oAI 8-ft ~/1'!-~/ EAST COUNTY SOIL CONSULTATION AND ENGINEERING, lNC. Second Response to Third-Party Geotechnical Review for Proposed Two-Story Residence with Basement Garage 5462 Carlsbad Boulevard Carlsbad, California 92008 FIGURE4 pH-RESISTIVITY TEST RESULTS L A B O R A T O R Y R E P O R T Page 6 February 14, 2021 Project No. 19-l 126G3 Telephone (619) 425-1993 Fax 425-7917 Established 1928 CLARKSON LABORATORY AND SUPPLY INC . 350 Trousdale Dr. Chula Vista, Ca. 91910 www .clarksonlab .com A N A L Y T I C A L A N D C O N S U L T I N G C H E M I S T S Date : February 3 , 2021 Purchase Order Number : NONE Sales Order Number : 50602 Account Number: EASCS To : *-------------------------------------------------* East County Soil Consultation and Engineering Inc . 10925 Hartley Road Suite I Santee, Ca 92071 Attention: Michael Duncan Laboratory Number: SO8103 Customers Phone : 258-7901 Fax : 258-7902 Sample Designation: *-------------------------------------------------* One soil sample received on 01/29/21 at 12:30pm, taken from Patel Carlsbad Blvd. Analysis By California Test 643, 1999, Department of Transportation Division of Construction, Method for Estimating the Service Life of Steel Culverts . pH 7 .1 Water Added (ml) 46 60 84 107 130 10 5 5 5 5 5 5 years years years years years to perforation to perforation to perforation to perforation to perforation for a for a for a for a for a Water Soluble Sulfate Calif. Water Soluble Rosa Bernal RMB/arr Chloride Calif . 16 gauge metal 14 gauge metal 12 gauge metal 10 gauge metal 8 gauge metal Test 417 Test 422 Resistivity (ohm-cm) 30000 25000 20000 20000 20000 21000 22000 culvert. culvert. culvert. culvert. culvert. <0 .003% 0.004% EAST COUNTY SOIL CONSULTATION AND ENGINEERING, INC.