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Home My WebLink AboutGeotechReviewRoughGrading(Oct.11,1999) II I I I I I (+) I I I I I I I I I I I I I OPnnlONlcn R..c~cI.." P.PIt, Converse Consultants Over 60 Years of Dedication in Geotechnical Engineering and Environmental Sciences GEOTECHNICAL REVIEW OF ROUGH GRADING PLAN Tracts 24182 -3, 24182-4 Paseo Del Sol Master Planned Community Temecula, California Prepared for Newland Communities 27393 Ynez Road, Suite 253 Temecula, CA 92591 Converse Project No. 96-81-420-36 October 11, 1999 10391 Corporate Drive, Redlands. California 92374 Telephone: (909) 796-0544 . Facsimile: (909) 796-7675 . e-mail- ccieconv@aol.com \ I I I I I I I I I I I I I I I I I I I (+) Converse Consultants Over 60 Years of Dedication in Geotechnical Engineering and Environmental Sciences October 11, 1999 Mr. Dean Meyer, R.C.E. Director of Engineering Newland Communities 27393 Ynez Road, Suite 253 Temecula, CA 92591 Subject: GEOTECHNICAL REVIEW OF ROUGH GRADING PLAN Tracts 24182 -3, 24182-4 Paseo Del Sol Master Planned Community Temecula, California Converse Project No. 96-81-420-36 Dear Mr. Meyer: Converse Consultants (Converse) has prepared this report to present our geotechnical review comments of the Rough Grading Plans for Tracts 24182-3 and -4 to evaluate site conditions and provide geotechnical grading recommendations for the site. 1.0 INTRODUCTION The location of the subject project is shown in Figure No.1, Site Location Map. The subject tracts are bound by Campanula Way on the north, on the east by Tract 24182-2, on the south by State Highway 79, and on the west by Meadows Parkway. In preparing this report, we have utilized the following reports and grading plans as references: . Preliminary Geotechnical Investigation Eastern and Southern Portion of the "Meadows", Approximately 800-acre site, City of Temecula, California, dated April 26, 1996, prepared by Converse for Newland Associates, Converse Project No. 96-81-420-01. . As Built Geology and Compaction Report of Rough Grading, Tracts 24182 through 24186 and 24188-1, Paseo Del Sol Master Planned Community, Temecula, California, dated August 20, 1997, prepared by Converse for Newland Associates, Converse Project No. 96-81-420-03. . Rough Grading Plan, Tract 24182-1, -2, -3, and -4, dated March 6, 1998, prepared by Keith International Inc., Number LD98-015GR. O Pnnl,"",,," R"qcl"d P.p.., 10391 Corporate Drive. Redlands, California 92374 Telephone: (909) 796-0544 . Facsimile: (909) 796-7675 . e-mail" ccieconv@aoLcom -v i I I I I I I I I I I I I I I I I I I I 96-81-420-36 October 11, 1999 Page 2 2.0 BACKGROUND The subject tract is located within the Pas eo Del Sol Master Planned Community in the City of Temecula, California. Tract 24182 had been previously mass graded in accordance with the above-referenced compaction report dated August 20, 1996 and the mass grading plans. At this time, the site is being graded in accordance with the above-referenced rough grading plans dated March 6, 1999. 3.0 PLAN REVIEW Based on our review of the subject rough grading plan, dated March 6, 1998, has conformed to our original recommendation of a minimum 15 foot compacted fill blanket over the area designated as a liquefiable zone in our original report. The existing compacted fill blanket thickness ranges from approximately 16.7 feet in the southwest corner of Tract No. 24182-4 to approximately 27.8 feet in a localized area near the proposed Guevara Drive alignment. For the subsurface conditions of the subject tracts prior to grading, see the above- referenced, geotechnical report dated April 26, 1996. Previous grade pad elevations from the subject grading plan dated March 6, 1998, in comparison with the mass grading compaction report, dated August 20, 1997, range from 0.0 feet to 2.9 feet higher than originally planned. 4.0 CONCLUSIONS The following conclusions are based on our review of the above referenced rough grading plans dated March 6, 1998, the proposed grading plans, data analysislinterpretation, and our previous experience with similar projects and professional judgement are listed below: . Compacted fill blanket thicknesses for the subject tracts meet or exceed the recommended 15-foot minimum provided in our preliminary report. · Grade changes range from 0.0 to 2.9 feet higher when compared to the original mass grading plan referenced in our compaction report, dated August 20, 1997. ~ ~ Converse Consultants CC I ENT\O FFICE\JO BFILEINEWLAN DI96-420196-420-36. grv 1 :? I I I I I I I I I I I I I I I I I I I 96-81-420-36 October 11, 1999 Page 3 . The subject grading plans are suitable for the proposed development, from a geotechnical point of view, provided recommendations provided in our preliminary report dated April 26, 1996 and are incorporated into grading, design, and construction. . Based on the time elapsed since the completion of previous grading, fill thickness, consolidation characteristics of the subsurface soils and the results of the settlement monitoring, it is our opinion that the majority of the primary consolidation settlement under existing fills has occurred over the subject tracts. . Final design recommendations should be based on additional investigation of the actual soil conditions at the completion of grading. 5.0 CLOSURE The site development recommendations and limitations provided in the above- referenced preliminary geotechnical report dated April 26, 1996 are still applicable. These recommendations include earthwork specifications, observation and testing during grading, site drainage, slope protection and maintenance, buried utilities and structural design recommendations. Site grading recommendations provided in the report dated April 26, 1996 may need to be augmented or modified based on field observation during grading. This report is written for the proposed residential project described herein and is intended for use solely by Newland Communities and its designated agents. It may not contain sufficient information for use by others andlor for other purposes. It should not be used as a bidding document but may be made available to the potential contractors for information on factual data only. An additional geotechnical report should be prepared to provide final design recommendations based on additional studies of the actual soil conditions at the completion of grading. This report has been prepared by the staff of Converse Consultants under the professional supervision of the registered engineers and the certified engineering geologist whose seals and signatures appear hereon. ~ ~ Converse Consultants CC I ENT\O FFICEIJO SFI LEIN EWLAN 019 6-42019 6-420-36. grv 1 A.. I I I I I I I I I I I I .1 .1 II I : I I I 96-81-420-36 October 11, 1999 Page 4 The findings, recommendations and professional opinions presented in this report were prepared in accordance with generally accepted professional geological and engineering practice at this time in Southern California. There is no other warranty, either express or implied. We appreciate this opportunity to be of continued service to Newland Communities. If you have any questions, please feel to contact the undersigned at (909) 796- 0544. CONVERSE CONSULTANTS N. Kuganenthira, Ph. D. gineer /Vl~ fJ& Michael O. Cook, C.E.G. 1716 Project Geologist Dist.: 3/Addressee Encl: Figure No.1, Site Location Map KNK\MOC\bac\mjr ~ ~ Converse Consultants CC IENTIO FFICEIJOBFI LEIN EWLAN 0196-420196-420-36. grv 1 ~ I I I I I I I I I I I I I I I I I I I 96-81-420-36 October 11, 1999 Page 5 REFERENCES American Society of Testing Materials (ASTMl, Annual Books of ASTM Standards, Volume 04.08 and 04.09. Converse Consultants (1996), Preliminary Geotechnical Investigation, Eastern and Southern Portion of the "Meadows", Approximately 800-acre site, City of Temecula, California, Dated April 26, 1996, prepared by Converse for Newland Associates, Converse Project No. 96-81-420-01. Converse Consultants (1997), As Built Geology and Compaction Report of Rough Grading, Tracts 24182 through 24186 and 24188-1, Paseo Del Sol Master Planned Community, Temecula, California, Dated August 20, 1997, Prepared by Converse for Newland Associates, Converse Project No. 96-81-420-03. 0' Hungr Geotechnical Research, Inc. (1992), Clara, Slope Stability Analysis in Two or Three Dimensions for IBM Compatible Microcmputers, Version 2.31. International Conference of Building Officials (1994), Uniform Building Code, Whittier, California. @ ~ Converse Consultants CCI ENT\O FFICE\JO BFI LE\N EWLAND\96-420\96-420-36. grv 1 ~ I I I I I I I I I I I I I I I I I I I I TO RIVERSIDE TO CORONA CD C ::j fT1 " :!l fT1 r o ~ ~ ~ ~ .., ~ '1\ '" ;! <:) fT1 ~ I'-"U8A City of (J> TO SAN DIEGO PROJECT SITE VICINITY MAP Reference: ROUGH GRADING PLAN, TRACT 24182-3 AND -4 KEITH INTERNATIONAL INC. INLAND EMPIRE DIVISION, CALIFORNIA NOT TO SCALE SITE LOCATION MAP PASEO DEL SOL, Tr. 24182-3 AND -4 TEMECULA, CALIFORNIA For: NEWLAND COMMUNITIES Project No. 96-81-420-36 @ Converse Consultants Figure No. 1 '\.