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Home My WebLink AboutCT 02-04; VILLAGES OF LA COSTA OAKS SOUTH; PAVEMENT RECOMMENDATIONS; 2004-01-30CrO2*QL. GEOCON INCORPORATED Project No. 06105-52-16 January 30, 2004 Pulte Homes 4141 Jutland Drive, Suite 200 Del Mar, California 92117, GEOTECHNICAL CONSULTANTS (V>) CITY OF CARLSI3AD APPROVED 0 WITH ADDITIONS - EY D.JE Attention: Mr. Robert Quiles Subject: VILLAGES OF LA COSTA - THE OAKS SOUTH NEIGHBORHOOD 3.14 CALLE PALIvllTO STATION 16+20 TO 19+30 AND STATION 20+55 TO 25+60 CORTE HORTENSIA STATION 10+00 TO 13+60 CORTE TOMILLO STATION 10+00 TO 17+10 SITIO MANANA STATION 12+60 TO 21+80 CARLSBAD, CALIFORNIA PAVEMENT RECOMMENDATIONS Gentlemen: In accordance with your request, we have performed supplemental geotechnical service s f o r t h e subject streets within Villages of La Costa - The Oaks South development. The scope of our services included obtaining representative subgrade soil samples within the street areas and perf o r m i n g Resistance Value (R-Value) tests. The purpose of our work was to provide pavement d e s i g n recommendations. To aid in preparing this letter, we have reviewed the improvement plans e n t i t l e d Improvement and Utility Plans for: Villages of La Costa - Neighborhood 3.14, prepared by Hunsaker & Associates, City of Carlsbad approval dated May 27, 2003, and our repor t e n t i t l e d Update Geotechnical Report, Villages of La Costa-The Oaks South, Neighborhood 3.14, C a r l s b a d , California, dated November 4, 2004 (Project No. 06105-52-16). Subgrade soils in the area are predominately sandy to clayey gravels and typically exhibit relati v e l y low to medium R-Value characteristics. Based on field observations and previous la b o r a t o r y t e s t s , subgrade materials possess an expansion potential of "low" to "medium" (Expansion I n d e x o f 9 0 o r less) as defined by Uniform Building Code (UBC) Table 18-I-B. R-Value laborato r y t e s t s w e r e performed in accordance with ASTM D 2844-99 (California Test Method 301) and the labor a t o r y test results are presented on Table I. It is our understanding that a Traffic Index (TI) of 4.5 has been assigned to Corte Tomillo and C o r t e Hortensia. Furthermore, we understand that a TI of 5.0 has been assigned to Calle Palmito a n d S i t i o Manana. Based on the above information and laboratory testing, we recommend the pa v e m e n t sections indicated on Table II. Pavement section calculations were performed in accordance w i t h t h e California Department of Transportation Highway Design Manual, Section 608.4 and the City of Carlsbad Minimum Structural Standard GS-17. Pavement section calculations are presented on Figure 1. These recommended sections should be considered preliminary with final sections t o b e determined and approved by the City of Carlsbad. 6960 Flanders Drive • San Diego, California 92121-2974 • Telephone (858) 558-6900 U Mx ld.Duj 330-01.3y Prior to placing base material for roadways as well as curb and gutter, we recommend the upper 12 inches of subgrade be scarified, moisture conditioned as necessary, and compacted to a dry density of at least 95 percent of the laboratory maximum dry density near to slightly above optimum moisture content in accordance with ASTM D 1557-00. In addition, Class 2 aggregate base 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. Asphalt concrete shoUld be compacted to a density of at least 95 percent of the laboratory Hveem density in accordance with ASTM D 2726-96a. The upper 12 inches of subgrade soils 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. Fill soil and base lift thickness should not exceed 6 inches. Class 2 aggregate base and asphalt concrete should conform to City of -Carlsbad specifications. The performance of asphalt concrete pavement is highly dependent on providing positive surface drainage away from the edge of the pavement. Ponding of water on or adjacent to the pavement will likely result in pavement distress and subgrade failure. To reduce the occurrence for such situations, we récommënd that a minimum drainage gradient of 1 percent be maintained for pavement surfaces. Drainage from landscaped areas shouldbe 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 convenience Very truly yours, GEOCON INCORPORATED RCE' 63291 Addressee Pulte Homes.La Costa Oaks Construction Office Attention: Mr. Jamie Ahrensberg Hunsaker & Associates Attention: Mr. David Blalock 4.D G' JOHN Lu HOOBS NO. 1524 CERTIFIED ENGINEERING J_ '..p GEOLOGIST - 'A 12-31-04 OF CAt/' No. 31 EWWM a~ l bs ,EG 1524 January 30, 2604 TABLE I SUMMARY OF R-VALUE TEST RESULTS ASTM D 2844-99 (CALIFORNIA TEST METHOD 301) Sample No. Location R-Value R-3 Calle Palmito Station 16+20 to 19+30 37 R-4 Calle Palmito Station 20+55 to 23+10 45 R-5 Calle Palmito Station 23+10 to 25+60 40 R-6 Corte Hortensia Station 10+00 to 13+60 29 R-7 Corte Tomillo Station 10+00 to 13+55 67 R-8 Corté Tomillo Station 13+55 to 17+10 40 R-9 Sitio Manana Station 12+60 to 15+70 - 59 R-10 Sitio Manana Station 15+70 to 18+80 . 38 R-11 Sitio Manana Station 18+80tO21±80 44 TABLE II PAVEMENT SECTION RECOMMENDATIONS Location Traffic Index (TI) Asphalt Concrete (inches) Class 2 Aggregate Base (inches) Calle Palmito Station 16+20 to 19+30 5.0 4 4 Calle Palmito Station 20+55 to 23+10 5.0 4 4 Calle Palmito Station 23+10 to 25+60 5.0 - 4 4 Corte Hortensia Station 10+00 to 13+60 4.5 4 4 Corte Tomillo Station 10+00 to 13+55 4.5 4 4 Corte Tomillo Station 13 +5 5 to 17+10 4.5 4 4 Sitio Manana Station 12+60 to 15+70 5.0 4 4 Sitio Manana Station 15+70 to 18+80 5.0 4 4 Sitio Manana Station 18+80 to 21+80 5.0 4 4 Project No. 06105-52-16 January 30, 2004 FIGURE 1 PAVEMENT SECTION CALCULATIONS VILLAGES OF LA COSTA -THE OAKS SOUTH Calle Palmito - Station 16+20 to. 19+30 Use subgrade R-Value = 37.0 Traffic Index (TI) 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)(100-37.0) - .83 = .1.7 feet from Table 608.4B Highway Design Manual with GF for Class 2 base = 1.1 Base thickness = 1.9'1 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. Calle Palmito - Station 20+55 to 23+10 Use subgrade R-Value =45.Q . 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 =.5 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 = (00032)(5.0)(100-45.0) - .83 .05 feet from Table 608.4B Highway Design. Manual with GF for Class 2 base = 1.1 Base thickness = .51 inches Use base thickness = 4.0 inches S S Design Street Structural Section Asphalt Concrete Thickness = 4.0 inches. Class 2 Aggregate Base Thickness = 4.0 inches. Project No. 06105-52-16 5 January 30, 2004 FIGURE 1 (Continued) PAVEMENT SECTION CALCULATIONS VILLAGES OF LA COSTA -THE OAKS SOUTH q - - S. Calle Palmito - Station 23+10 to 25+60 Use subgrade R-Value = 40.0 Traffic Index (TI) = 5.0 .f. 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 =.5.5 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)(100-40.0) -183 =.13 feet from Table 608.4B Highway Design Manual with GF for Class 2 base = 1.1 Base thickness =, 1.38 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. Corte Hortensia - Station 10+00 to 13+60 Use subgrade R-Value = 29.0 Traffic Index (TI) = 4.5 Methodology = CALTRANS Highway Design Manual Section 608.4 Safety Factor = 0.2 -- Applied to Asphalt Concrete (AC) GE for AC = (0.0032)(4.5)(100-78.0)+0.2 =.52 feet from Table 608.4B Highway Design Manual GE = .52 feet for AC yields actual thickness = 2.48 inches Use 4.0 inches of AC - City Minimum GE for 4.0 inches of AC = .83 feet GE for base = (0.0032)(4.5)(100-29.0) - .83 = .19 feet from Table 608.4B Highway Design Manual with GF for Class 2 base = 1.1 Base thickness = 2.06 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. Project No. 06105-52-16 . ', ;' .5-. . , January 30, 2004 Sr FIGURE 1 (Continued) PAVEMENT SECTION CALCULATIONS VILLAGES OF LA COSTA - THE OAKS SOUTH Corte Tomillo - Station 10+00 to 13+55 Use subgrade R-Value = 67.0 Traffic Index (TI) = 4.5 Methodology = CALTRANS Highway Design Manual Section 608.4 Safety Factor =0.2 -- Applied to Asphalt Concrete (AC) GE for AC (0.0032)(4.5)(100-78.0)-f0.2 =.52 feet from Table 608.4B Highway Design Manual . GE = .52 feet for AC yields actual thickness= 2.48 inches Use 4.0 inches of AC - City Minimum GE for 4.0 inches of AC =.83 feet GE for base = (0.0032)(4.5)(100-67.0) -.83 = -.36 feet from Table 608.413 Highway Design Manual with GF for Class 2 base = 1.1 Base thickness = -3.91 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. Corte Tomillo - Station 13+55 to 17+10 Use subgrade R-Value = 40.0 Traffic Index (TI) = 4.5 Methodology = CALTRANS Highway Design Manual Section 608.4 Safety Factor = 0.2 -- Applied to Asphalt Concrete (AC) GE for AC = (0.0032)(4.5)(100-78.0)+0.2 =.52 feet from Table 608.4B Highway Design Manual GE = .52 feet for AC yields actual thickness = 2.48 inches Use 4.0 inches of AC - City Minimum GE for 4.0 inches of AC = .83 feet GE for base = (0.0032)(4.5)(100-40.0) -.83 = .03 feet from Table 608.4B Highway Design Manual with GF for Class 2 base = 1.1 Base thickness = .33 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. Project No. 06105-52-16 January 30, 2004 FIGURE 1 (Continued) PAVEMENT SECTION CALCULATIONS VILLAGES OF LA COSTA - THE OAKS SOUTH Sitio Manana - Station 12+60 to 15+70 Use subgrade R-Value = 59.0 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)(100-59.0) - .83 = -.18 feet from Table 608.4B Highway Design Manual with GF for Class 2 base = Base thickness = -1.93 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. Sitio Manana Station 15+70 to 18+80 Use subgrade R-Value = 38.0 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)(100-38.0) -.83 =.16 feet from Table 608.4B Highway Design Manual with GF for Class 2 base = 1.1 Base thickness = 1.73 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. Project No. 06105-52-16 January 30, 2004 FIGURE 1 (Continued) PAVEMENT SECTION CALCULATIONS VILLAGES OF LA COSTA - THE OAKS SOUTH Sitio Manana - Station 18+80 to 21+80 Use subgrade R-Value = 44.0 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)(5M)(100-44.0) - .83 = .06 feet from Table 608.4B Highway Design Manual with GF for Class 2 base = 1.1 Base thickness .68 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. Project No. 06105-52-16 . January 30, 2004 GEOCON AT1fl Project No. 06105-52-16 January 19, 2004 Pulte Homes 4141 Jutland Drive, Suite 200 Del Mar, California 92117 Attention: Mr. Robert Quiles LLUI.tLMINlLP1 LL)INJULII CITY OF CARLSBAD APPROVED O WITH ADDITIONS DATE (44) Subject: VILLAGES OF LA COSTA - THE OAKS SOUTH NEIGHBORHOOD 3.14 CALLE PALMITO STATION 10+00 TO 16+20 CARLSBAD, CALIFORNIA PAVEMENT RECOMMENDATIONS Gentlemen: In accordance with your request, we have performed supplemental geotechnical services for the subject street within Villages of La Costa - The Oaks South development. The scope of our services included obtaining representative subgrade soil samples within the street areas and performing Resistance Value (R-Value) tests. The purpose of our work was to provide pavement design recommendations. To aid in preparing this letter, we have reviewed the improvement plans entitled Improvement and Utility Plans for. Villages of La Costa - Neighborhood 3.14, prepared by Hunsaker & Associates, City of Carlsbad approval dated May 27, 2003, and our report entitled Update Geotechnical Report, Villages of La Costa-The Oaks South, Neighborhood 3.14, Carlsbad, California, dated November 4, 2004 (Project No. 06 105-52-16). Subgrade soils in the area are predominately sandy to clayey gravels and typically exhibit relatively low R-Value characteristics. Based on field observations and previous laboratory tests, subgrade materials possess an expansion potential of "low" to "medium" (Expansion Index of 90 or less) as defined by Uniform Building Code (IJBC) Table 18-I-B. R-Value laboratory tests were performed in accordance with ASTM D 2844-99 (California Test Method 301) and the laboratory test results are presented on Table I. It is our understanding that a Traffic Index (TI) of 5.0 has been assigned to the subject street. Based. on the above information and laboratory testing, we recommend the pavement sections indicated on Table II. Pavement section calculations were performed in accordance with California Department of Transportation Highway Design Manual, Section 608.4 and the City of Carlsbad Minimum Structural Standard GS-17. Pavement section calculations are presented on Figure 1. These recommended sections should be considered preliminary with final sections to be determined and approved by the City of Carlsbad. Furthermore, we understand that the City of Carlsbad requires lime treatment of subgrade soils when the R-Value is less than 12. However, it is the opinion of Geocon Incorporated that the lime treatment of subgrade soils along the subject roadway alignments is not feasible due to the amount of rock present near finish subgrade elevation. Therefore, a waiver of the lime treatment policy is requested. 6960 Flanders Drive U San Diego, California 92121-2974 U Telephone (858) 558-6900 U Fax (858) 558-6159 Prior* to placing base material for roadways as well as curb and gutter, we recommend the upper 12 inches of subgrade be scarified, moisture conditioned as necessary, and compacted to a dry density of at least 95 percent of the laboratory maximum dry density near to slightly above optimum moisture content in accordance with ASTM D 1557-00. In addition, the Class 2 aggregate base should be compacted to a dry density of at least95 percent of the laboratory maximum dry density near to slightly above optimum moisture content. Asphalt concrete should be compacted to a density of at least 95 percent of the laboratory Hveem density in accordance with ASTM D 2726-96a. The upper 12 inches of subgrade soils 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. Fill soil and base lift thickness should not exceed 6 inches. Class 2 aggregate base and asphalt concrete should conform to City of Carlsbad specifications. The performance of asphalt concrete pavement is highly dependent on providing positive surface drainage away from the edge of the pavement. Ponding of water on or adjacent to the pavement will likely result in pavement distress and subgrade failure. To reduce the occurrence for such situations, we recommend that a minimum drainage gradient of 1 percent be maintained for pavement surfaces. Drainage from landscaped areas should be directed to controlled drainage strutures. Should 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 RCE 63291 SR:bjl (2) Addressee '10- (3/del) Pulte Homes (Construc ion 01 (I) Hunsaker & Associates Attention: Mr. David-Blalock Project No. 06105-52-16 -2 - January 19, 2004 TABLE-1 SUMMARY OF R-VALUE TEST RESULTS ASTM D 2844.99 (CALIFORNIA TEST METHOD 301) Sample No Location R-Value R-1 Calle Palmito, Station 10+00 to 13+10 10 R-2 Calle Palmito Station 13+10 to 16+20 10 TABLE II PAVEMENT SECTION RECOMMENDATIONS Traffic Index Asphalt Class 2 Location (TI) Concrete Aggregate Base (inches) (inches)• Calle Palmito Station 10+00 to 13+10 5.0 4 7 Cafle Palmito Station 13+10 to 1,6+20 5.0 4 7 Project No. 06105-52-16 January 19, 2004 FIGURE 1 PAVEMENT SECTION CALCULATIONS VILLAGES OF LA COSTA - THE OAKS SOUTH Calle Palmito - Station 10+00 to 13+10 Use subgrade R-Value = 10.0 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)(100-10.0) - .83 = .61 feet from Table 608.4B Highway Design Manual with GF for Class 2 base = 1.1 Base thickness = 6.62 inches Use base thickness = 7.0 inches Design Street Structural Section Asphalt Concrete Thickness = 4.0 inches. Class 2 Aggregate Base Thickness = 7.0 inches. Calle Palmito - Station 13+10 to 16+20 Use subgrade R-Value = 10.0 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)(100-10.0) - .83 = .61 feet from Table 608.4B Highway Design Manual with GF for Class 2 base = 1.1 Base thickness = 6.62 inches Use base thickness = 7.0 inches Design Street Structiral Section Asphalt Concrete Thickness = 4.0 inches. Class 2 Aggregate Base Thickness = 7.0 inches. Project No. 06105-52-16 January 19, 2004