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Home My WebLink AboutCT 07-05; LA COSTA GREENS NEIGHBORHOOD 1.03; PAVEMENT RECOMMENDATIONS; 2009-04-10GEOCON INCORPORATED C1 o1-05 GEOTECHNICAL CONSULTANTS Project No. 06403-52-32A April 10, 2009. CoiRich 4747 Morena Boulevard, Suite 100 San Diego, California 92117 Attention: Ms. Teri Shusterman Subject: VILLAGES OF LA COSTA - THE GREENS NEIGHBORHOOD 1.03 JASPER WAY - STATIONS 16+00 THROUGH 22+70 TRONA WAY - STATIONS 10+15 THROUGH 11+74 CARLSBAD, CALIFORNIA PAVEMENT RECOMMENDATIONS Dear Ms. Shusterman: In accordance with'the request of Mr. Larry Willis, your onsite superintendent, we obtained subgrade soil samples from the subject roadways. After collection, we performed Resistance Value (R-Value) tests on the samples. Based on conversations with the project civil engineer from Hunsaker and Associates San Diego Incorporated, we understand that a Traffic Index'(TI) of 5.0 has been assigned to the subject roadways;. . . Subgrade soil consists predominately of silty to clayey sand, and typically exhibits relatively low to moderate R-Value characteristics. We performed the laboratory R-Value tests in-accordance with ASTM D 2844 (California Test Method No. 301). The results of the laboratory tests and the corresponding roadway station numbers are presented in Table I. Based .on laboratory testing, we calculated the pavement sections in accordance with California Department of Transportation Highway Design Manual and the City of Carlsbad Minimum Structural Standard GS-17. The pavement sections and the Traffic Index are presented in Table II. Calculations for the. pavement sections are presented in Figure i. Final pavement section approval should be obtained from the City of Carlsbad. Asphalt concrete should conform to Section 203-6 of the Standard Specifications for Public Works Construction (Greenbook). Class 2 aggregate base materials should conform to Section 26-1.02A of the Standard SpecIcations of the State of California, Department of Transportation (Caltrans) or approved equivalent. Additionally, 'materials should conform to City of Carlsbad specifications. Prior to placing base materials for roadways and curb/gutter, the upper 12 inches of subgrade should be scarified, moisture conditioned as necessary, and compacted to a dry density of at least 95 percent of the laboratory maximum dry density in accordance with ASTM D 1557. The upper 12 inches of subgrade beneath areas to receive concrete sidewalks should be compacted to a. dry density of at least 90 percent of the laboratory, maximum dry density near to slightly above optimum moisture content. 6960 Flanders Drive 0 San Diego, California 92121-2974 0 Telephone (858) 558-6900 U Fox (858) 558-6159 The base materials should be compacted to a dry density of at least 95 percent of the laboratory maximum dry density near to slightly above optimum moisture content. The asphalt concrete should be compacted to a density ofat least 95 percent of the laboratory Hveem density in. accordance with ASTM D 2726. -. The performance of asphalt concrete pavement is highly dependent on providing iIositive surface drainage away from the edge of the pavement. Ponding of water on or adjacent to the pavement will likely result in saturation of the subgrade materials and may cause pavement distress. To reduce the occurrence for such situations, a minimum drainage gradient of at least 1 percent should be maintained for pavement surfaces. Drainage from landscaped areas should be directed to controlled drainage structures. Should you have any ,questions regarding this correspondence, or if we may be of further service, please contact the undersigned at your conve'nience. . Very truly yours, GEOCON INCORPORATED . . Michael C. Ertwine i Sadr Shawn Weedon .. Senior Staff Geologist CEG 1778 . GE 2714 MCE:AS:SW:dmc . WIC AU 0 b Site Trailer 0 SADR 01" tr No. 1r16 z Mr. Larry Willis. M .2 14 .1 CERTIF16~ Exp. 06130/09 m :: Associates ENGINEEFUNG Mr. David Blalock GEOLMST Project No. 06403-52-32A . - 2 - . April 10, 2009 FIGURE PAVEMENT SECTION CALCULATIONS FOR LASCOSTAGREENS - NEIGHBORHOOD 1.03 Jasper Way - Stations 16+00 through 19+40 Use subgrade R,-Value = 35.0 Traffic Index (TI) = 5.0 Methodology = Caltrans Highway Design Manual Section 608.4 Safety Factor = 0.2--Applied, to Asphalt Concrete (AC) GE for AC = (0.0032)( 5.0)(.100-78.0)+0.2 = .55 fet from Table 608.4B Highway Design Manual' GE = .55 feet for AC yields actual thickness = 2.65 inches - 0 Use 4.0 inches of AC - City Minimum GE for 4.0 inches of AC= .83 feet GE for base = (0.0032)(5.0)(100-35.0) -.83 =21 feet from Table 608.4B Highway Design Manual with GF for Class 2 base = 1:1 Base thickness = 2.25 inches Use base thickness = 4.0 inches *** Design Street Structural Section *** Asphalt Concrete Thickness = 4.0 inches. Class 2 Aggregate Base Thickness = 4.0 inches. - Jasper Way - Stations 19+40 through 22+70 Use subgrade R-Value = 28.0 Traffic Index (TI) = 5.0 Methodology = Caltrans Highway Design Manual Section 608.4 S Safety. Factor = 0.2 - Applied to Asphalt Concrete (AC) GE for AC = (0.0032)(5.0)(100-78.0)+0.2 .55 feet from Table 608.4B Highway Design Manual GE .55 feet for AC yields actual thickness 2.65 inches Use 4.0 inches of AC - City Minimum GE for 4.0 inches of AC = .83 feet GE for base = (0.0032)(5.0)(100-28.0) -.83 = .32 feet from Table 6084B Highway Design Manual with GF for Class 2 base = 1.1 Base thickness 3.48 inches 0 Use base thickness = 4.0 inches - - Design Street Structural Section *** Asphalt Concrete Thickness = 4.0 inches. Class 2 Aggregate Base Thickness 4.0 inches. • Project No. 06403-52732A . . - 0 ) April 10, 2009 FIGURE 1 (Continued) PAVEMENT SECTION CALCULATIONS FOR LA COSTA GREENS - NEIGHBORHOOD 1.03' Trona Way - Stations 10+15 through 11+74 Use subgrade R-Value = 28.0 - Traffic Index (TI) = 5.0 Methodology = Caltrans Highway Design Manual Section 608.4 Safety Factor = 0.2 - Applied to Asphalt Concrete (AC) GE for AC = (0.0032)(5.0)(100-78.0)+0.2 =.55 feet from Table 608.4B Highway Design Manual GE= .55 feet fórAC yields actual thickness =2.65 inches D Use 4.0 inches of AC - City. Minimum GE for 4.0 inches of AC = .83 feet GE for base = (0.0032)(5.0)(100-28.0) -.83 = .32 feet from Table 6084B Highway Design Manual with GF for Class 2 base = 1.1 Base thickness = 3.48 inches Use base thickness = 4.0 inches *** Design Street Structural Section *** Asphalt Concrete Thickness = 4.0 inches. S Class 2 Aggregate Base Thickness = 4.0 inches. TABLE I - SUMMARY OF R-VALUE TEST RESULTS ASTM D 2844-01 (CALIFORNIA TEST METHOD NO. 301) Sample Number Location R-Value R-4 Jaspe Way - Stations 16+00 through 19+40 35 R-5 Jasper Way - Stations 19+40 through 22+70 28 R-5 Trona Way - Stations 10+ 15 through 11+74 28 - TABLE II PAVEMENT SECTION RECOMMENDATIONS Traffic Asphalt Class 2* Location Index (TI) R-Value Concrete Aggregate (inches) Base (inches) Jasper Way - Stations 16+00 through 19+40 5.0 35 4.0 4.0. Jasper Way - Stations 19+40 through 22+70 5.0 28 4.0 4.0 Trona Way — Stations 10+15 through 11+74 5.0 28 4.0 4.0 *Or approved equivalent. a ProjectNo. 06403-52-32A April 10, 2009 GEOCON . I NCORPORA T ED GEOTECHNICAL CONSULTANTS (410) Project No. 06403-52-32A March 12, 2009 CoiRich - 4747 Morena Boulevard, Suite 100 San Diego, California 92117 Attention: Ms. Teri Shusterman Subject: -ELA COSTA — THE-GREENS CINNABAR WAY STATIONS 10+65 THROUGH 16+00 COPPER WAY. STATIONS 16+00 THROUGH 19+40 / CARLSBAD, CALIFORNIA PAVEMENT RECOMMENDATIONS Dear Ms. Shusterman: In accordance with, Mr. Larry Willis, your onsite superintendent, we obtained subrade soil samples from the subject roadways. After collection, we performed Resistance Value (R-Value) tests on the samples. Based on conversations with the project civil engineer from Hünsaker and Associates San Diego Incorporated, we undèrstand that a Traffic Index (TI) of 5has been assigned to the subject roadways. . Subgrade soil consists predominately of silty to clayey sand, and- typically exhibits low R-Value characteristics. We performed the laboratory R-Value tests in accordance with ASTM D2844 (California Test Method No. 301): The results of the laboratory tests and the corresponding roadway station numbers are presented in Table I. Based on laboratory testing, we calculated the pavement sections in accordance with California Department of Transportation Highway Design Manual and the City of Carlsbad Minimum Structural .(Standard GS-17. The pavement sections and the Traffic Index are presented in Table II. Calculations for the pavement sections are presented in Figure 1. -Final pavement section approval should be obtained from the City of Carlsbad. Asphalt concrete should conform to Section 203-6 of the Standard Specifications for Public Works Construction (Greenbook). Class 2 aggregate base materials should conform to Section 26-1.02A of the Standard Specifications of the State of California, Department of Transportation (Caltrans) or approved equivalent. Additionally, materials should conform to City of Carlsbad specifications. Prior to placing base materials for roadways and curb/gutter, the upper 12 inches. of subgrade should be scarified, moisture conditioned as necessary, and compacted to a dry density of at least 95 Scent of the laboratory maximum dry density in accordance with ASTM D 1557. The upper 12 inches of subade beneath areas to receive concrete sidewalks should be compacted to a dry density of at least 90 percent of the laboratory maximum dry density near to slightly above optimum moisture content. 6960 Flanders Drive U San Diego, California 92121-2974 0 Telephone (858) 558-6900 0 Fax (858) 558-6159 The base materials should be compacted to a dry density of at least 95 percent of the laboratory maximum dry density near to slightly above optimum moisture content. The asphalt concrete should be compacted to a density of at least 95 percent of the laboratory Hveem density in accordance with. ASTM D 2726. The performance of asphalt concrete pavement is highly dependent on providing ositive surface drainage away from the edge of the pavement. Ponding of water on or adjacent to the pavement will likely result in saturation of the subgrade materials and may cause pavement distress. To reduce the occurrence for such situations, a minimum drainage gradient of at least 1 percent should be maintained for pavement surfaces. Drainage from landscaped areas should be directed to 'controlled drainage structures. ShQuld 'you have any questions regarding this correspondence, or if we may be of further service, please contact the undersigned at your convenience. - Very truly yours, GEOCON INCORPORATED. . Michael C. Ertwine Shawn Weedon Senior Staff Geologist . . GE 2714 • ' (2) Addressee (3/del) qolRich Job Site Trailer ~2 No 2714 Attention: Mr. David B lalock OF Project No. 06403-52-32A -2- March 12, 2009 FIGURE 1 PAVEMENT SECTION CALCULATIONS FOR LA COSTA GREENS - NEIGHBORHOOD 1.03 Cinnabar Way - Stations 10+65 through 13+00 Use subgrade R-Value = 33.0 Traffic Index (TI) = 5.0 Methodology = Caltrans Highway Design Manual Section 608.4 Safety Factor = 0.2 - Applied to Asphalt Concrete (AC) GE for AC = (0.0032)(5.0)(100-78.0)+0.2 .55 feet from Table 608.4B Highway Design Manual GE = .55 feet for AC yields actual thickness = 2.65 inches Use 4.0 inches of AC - City Minimum - GE for 4.0 inches of AC = .83 feet. GE for base = (0.0032)(5.0)(100-33.0)-.83 = .24 feet from Table 608.4B Highway Design Manual with OF for Class 2 base = 1.1 Base thickness = 4.0 inches Use basethickness = 4.0 inches, City of Carlsbad minimum *** Design Street Structural Section *** Asphalt Concrete Thickness = 4.0 inches. Class 2 Aggregate Base Thickness = 4.0 inches. Cinnabar Way - Stations 13+00 through 16+00 Use subgrade R-Value = 28.0 - Traffic Index (TI) = 5.0 - Methodology = Caltrans Highway Design Manual Section 608.4 Safety Factor .= 0.2 - Applied to Asphalt Concrete (AC) GE for AC = (0.0032)(5.0)(100-78.0)+0.2 =.55 feet from Table 608.4B Highway Design Manual GE = .55 feet for AC yields actual thickness = 2.65 inches Use 4.0 inches of AC - City Minimum - GE for 4.0 inches of AC =.83 feet GE for base = (0.0032)(5.0)(100-28.0)-.83 =.32 feet from Table 608.4B Highway Design Manual with GF for Class 2 base = 1.1 Base thickness = 3.48 inches Use base thickness = 4.0 inches, City of Carlsbad minimum *** Design Street Structural Section *** Asphalt Concrete Thickness = 4.0 inches. Class 2 Aggregate Base Thickness = 4.0 inches. Project No. 06403-52-32A March 12, 2009 FIGURE 1 (Continued) PAVEMENT SECTION CALCULATIONS FOR LA COSTA GREENS - NEIGHBORHOOD 1.03 Copper Way - Stations 16+00 through 19+40 Use subgrade R-Value = 21.0 - Traffic Index (TI) = 5.0 - Methodology = Caltrans Highway Design Manual Section 608.4 Safety Factor = 0.2 - Applied to Asphalt Concrete (AC) GE for AC = (0.0032)(5.0)(100-78.0)+0.2 =.55 feet from Table 608.4B Highway Design Manual GE = .55 feet for AC yields actual thickness ='2.65 inches Use 4.0 inches of AC City Minimum - GE for 4.0 inches of AC =.83 feet GE for base = (0.0032)(5.0)(100-21.0)-.83 =.43 feet from Table 608.4B Highway Design Manual with GF for Class 2 base = 1.1 Base thickness = 4.70 inches Use base thickness = 5.0 inches, City of Carlsbad minimum *** Design Street Structural Section *** Asphalt Concrete Thickness =4.0 inches. Class 2 Aggregate Base Thickness = 5.0 inches. - If Project No. 06105-52-32A March 12, 2009 TABLE I SUMMARY OF R-VALUE TEST RESULTS ASTM D 2844-01 (CALIFORNIA TEST METHOD NO. 301) Sample Number Location R-Value R-1 Cinnabar Way - Stations 10+65 through 13+00 33 R-2 Cinnabar Way - Stations 13+00 through 16+00 28 R-3 Copper Way - Stations 16+00 through 19+40 21 TABLE II PAVEMENT SECTION RECOMMENDATIONS Traffic Asphalt Class 2*. Location Index (TI) R-Value Concrete Aggregate (inches) Base (inches) Cinnabar Way - Stations 10+65 through 13+00 5.0 33 4.0 4.0 Cinnabar Way - Stations 13+00 through 16+00 5.0 2. 4.0 4.0 Copper Way - Stations16+00 through 19+40 1 5.0 21 4.0 5.0 *Or approved equivalent. \ , ,. Project No. 06403-52-32A . March 12, 2009 /