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HomeMy WebLinkAboutTract Map 3883 Lot 156 Rough Grading RECEIVED OCT 3 0 2000 CITY OF TEMECULA ENGINEERING DEPARTMENT LAKESHORE Engineering Consulting Civil Engineers October 28, 2000 Project No. 00-0306.LG Attention: Department of Public Works City of Temecula, CA. Client: Mr. and Mrs. Maag (909) 698-5460 29101 Camino Abla Murrieta, CA 92563 Subject: Rough Grade Pad Certification Letter Proposed Single Family Home Construction Lot 156 of Tract No. 3883 City of Temecula, CA. LD 00-154GR Reference: Grading Plan by Lakeshore Engineering 20-Scale Plan, dated April 10, 2000 (P.N. 00-030.GP) Gentlemen: Per your request, Lakeshore Engineering has recently conducted a site inspection with the purpose of certifying the completed rough grading operation. Our site observation indicated that the rough grading operation is now completed and was performed in substantial compliance with the approved grading plan on file. There were no major deviation noted in the field except the house pad was lowered 12 inches from designed finished grade. Proposed surface drainage pattern remained unchanged. The house finished pad grade is at F.G.=1180.00 (and within 2/100 tho tolerance). Reference benchmark is at F.L.=1l77.0 at beginning of westerly driveway approach. This certification letter is for lines and grades and location of cut and fill slopes. The building pad is now considered sui table for its intended use. installation of permanent slopes will be required prior to Fen 31520-8 Railroad Canyon Road' Canyon Lake, CA 92587 . (909) 244-2913 . FAX: (909) 244-2987 \ I i. . . . ~ w . . I I I . I . . I . ROUGH GRADE COMPACTION REPORT 3gg3 Lot /5(;; PROPOSED SINGLE FAMILY HOME CONSTRUCTION LOT 156 OF TRACT NO. 3883 LINDA ROSEA ROAD RANCHO CALIFORNIA, CALIFORNIA A.P.N. 919-131-002 FOR MR. GENE MAAG PROJECT NO. 00-030.COM DATED OCTOBER 24, 2000 Lakeshore Engineering Z- I I I I I "I - II I I I I I I I I I -. I LAKESHORE Engineering Consulting Civil Engineers October 24, 2000 Project No: 00-030.COM Client: Mr. and Mrs. Maag (909) 698-5460 29101 Camino Abla Murrieta, CA 92563 Subject: Rough Grade Compaction Report Proposed Single Family Home Construction Lot 156 of Tract No. 3883 City of Temecula, CA. A.P.N. 919-131-002 Reference: 1. Soil and Foundation Report P.N. 00-034.PI, dated July 20, 2000 2. Precise Grading Plan Prepared by Lakeshore Engineering 20 scale, dated April 10, 2000 Gentlemen: INTRODUCTION This report presents the results of our field density tests and site inspections made during the placement of compacted fill on the subject site. Periodic field density tests and site observations were provided by a representative of Lakeshore Engineering to check the grading contractors on compliance with the drawing and job specifications. The presence of our field representative at the site was to provide to the owner a source of professional advice, opinions and recommendations based upon the field representative's observations of the contractor's work and did not include any supervision, superintending or direction of the actual work of the contractors or the contractor's workmen. The opinions and recommendations presented hereafter are based on our tests and observations of the grading procedures used, and represent our engineering judgment as to the contractor's compliance with the job grading specifications. BACKGROUND INFORMATION AND PROPOSED DEVELOPMENT The subject lot is in the community of Meadowview where homes are single family, upper middle class, custom designed and built. Except for sewer services (all lots are planned for individual septic system), offsite improvements are already inplaced. Proposed development will consist of a one story single family residence founded on a level graded pad. 31520-8 Railroad Canyon Road' Canyon Lake, CA 92587 . (909) 244-2913 . FAX: (909) 244-2987 6 I I I I I I I I I I I I I I I I I I I October 24, 2000 Project No.:00-030.COM Page Two Review of house plans provided to us by client, indicates proposed construction will consist of approximately 3,000 square feet of living space, of conventional woodframed and stucco construction. Foundation is planned for conventional spread footings and concrete slab-on-grade floors. GRADING OBSERVATION AND TESTING Grading operation started on September 27, 2000 with a pre grade site meeting and and concluding on October 21, the last day of our field inspection and testing services. Equipment used included a CAT. D-6 and a CAT. D-4. The rough grading operation was observed to be performed in the following manner: 1. Vegetation, surface debris were cleared from the areas to be rough graded. 2. Unsatisfactory soils were excavated to expose competent materials on which to start the fill. The maximum depth of fill placed onsite was about 15 vertical feet located along the top of fill slope (north corner of house pad). The average depth of fills placed under the house pad (overexcavation and recompaction) was 4 feet_ 3. The native soils exposed at the bottom substandard soil removal, inspected and are in our opinion, considered suitable for support of compacted fills. Prior to placing any fills, the exposed bottom subgrade was scarified, moisture conditioned and then recompacted. 4. Equipment width size keyway (15 feet wide by 3 feet deep minimum) were excavated to exposed competent bottom prior to placing slope fill. A continuous keyway was constructed along the toe of fill slope. 5. Manufactured fill slopes are in the order of less than 30 feet high and cut slope are less than 20 feet high. Slopes are pitched at 2:1(H:V) or less. 6. Approved soils were placed in layers on each prepared surface, and each layer was compacted to the specified density before the next layer was added. 7. The minimum acceptable degree of compaction content was 90 percent of the laboratory maximum dry density. 8. Maximum density and optimum moisture content were determined by the A.S.T.M. D1557-78 method. Lakeshore Engineering -s I I I I I I I I I I I I I I I I I I I October 24, 2000 Project No.:00-030.COM Page Three 9. Field density tests were performed utilizing the sandcone method (A.S.T.M. D1556) and the drive tube method. 10. The onsite compacted fill consisted predominantly of a brown Silty SAND (SM/SP), trace of clay. The import fill dirt was predominantly a silty fine SAND. 11. Field density tests were made during the placement of fills to determine the degree of relative compaction and moisture content. All field density tests are listed in the "Summary of Field Density Tests", and their approximate locations are shown on Figure No.2. Also shown are the limits of the compacted fill placed during this grading operation. GRADING DEVIATIONS FROM APPROVED PLAN Near the conclusion of rough grading operation, no major deviation were noted in the field when compared with the approved plan on file, except the house pad was lowered 12 inches from designed pad grade. All drainage scheme remain the unchanged_ LABORATORY TEST PROCEDURES MAXIMUM DENSITY COMPACTION TEST Soil samples obtained from the field were visually identified and when necessary, additional laboratory testing was performed to confirm identification. All soils were classified with the Unified Soil Classifications System. The procedures outlined in A. S. T .M. Method D1557-78 were used to determine the compaction characteristics of the fill materials. The results of our laboratory compaction tests are presented below: Soil Type Soil Description Optimum Moisture Max. Dry Content Density A Brn. Silty SAND (SM/SP) 12.0 % of dry wt. 128.0 p.c.f. B Grey Brown silty fine SAND 12.5 % of dry wt. 119.0 p.c.f. (SM-import) Lakeshore Engineering ~ I I I I I I I I I I I I I I I I I I I October 24, 2000 Project No.:00-030.COM Page Four LABORATORY EXPANSION TEST A Laboratory Expansion Index Test was performed on a representative soil sample recovered from within the proposed building area at the subject site. The laboratory expansion test was performed in accordance with U.B.C. Test Method 29-C, and the pertinent test results are presented below: Soil Description Depth Moisture % Content Expan. Expansion Index Potential Silty SAND trace clay -1/2 8.8 <30 LOW Based upon a test result of 30, subgrade materials are considered to be LOW/MEDIUM in expansion potential. Conclusions and recommendations as presented in the reference soil reports remain applicable and should be incorporated into the design and construction phases of this project. SULPHATE CONTENT TEST The laboratory test was performed in accordance with E.P.A. Test Method 375.3, and the pertinent test results are presented below: SAMPLE Location BLDG. PAD Depth F.G. SULPHATE Content RECOMMENDED CEMENT ~ ND ppm. Portland Cement TYPE 11 CONCLUSION AND RECOMMENDATIONS Based on the final results of field density tests, on observations of the grading operation procedures used in the field and on our past experience, it is Lakeshore Engineering opinion that the compacted fill as shown on the Plot Plan, figure no. 2 attached has been placed in accordance with the applicable portions of the job specifications and in accordance with the City of Temecula adopted ordinance. The conclusions and recommendations presented in our preliminary soil report, dated July 20, 2000 remains applicable, and should be incorporated into the deisgn and construction phases of the building contruction. Any fill dirt added beyond the limits or above the grades shown on the attached plot plan, should be placed under engineering inspection and in accordance with the applicable grading job specifications, if it is to be covered by the recommendations of this report. Lakeshore Engineering 1 I I I I I I I I I I I I I I I I I II II October 24, 2000 Project No.:00-030.COM Page Five Based upon our field testing results, it is our opinion that the fill placed has been compacted to at least 90 percent of its relative density. The foundation soils are considered low-moderate in expansion potential. The graded pad has provided compacted fill mat cushion of 4 feet thick. Footings should be founded at least 18 inches below the lowest adjacent ground surface, for one and/or two story building sections. All continuous foundations should be reinforced with at least two no. 4 rebars at top and two rebars at bottom (total of 4 rebars) and consistent with the recommendations of the Structural Engineer or Architect and the guidelines in the U. B. C. Footing reinforcement should also be placed across garage grade beam at door opening. CONCRETE SLAB-ON-GRADE The onsite native and stockpile soils are considered to be low- moderate in expansion potential. Presaturation of subgrade prior to concrete slab-on-grade pour is recommended. Pre saturation of local soils to 120% over optimum and 12 inches penetration is suggested. Concrete floor slabs may be supported directly on properly prepared subgrade. If a floor covering that could be critically affected by moisture, such as vinyl tile, slabs should be protected by a plastic vapor barrier of six-mil thickness. The sheet should be covered by at least two-inches of sand cushion to prevent punctures and aid in concrete cure. The concrete floor slabs should be reinforced with at least 6" x 6"-#10/#10 welded wire mesh or equivalent bar reinforcing (no. 3 rebars at 18 inches on center) and installed at mid-height (using chair support). Concrete floor slabs should be at least 4 inches thick nominal. Cold joints should not exceed 14 feet apart maximum, either directions. FOOTING INSPECTION Due to periodic inspections by consultant, footing trench excavations should be inspected by a representative of Lakeshore Engineering prior to placement of reinforcing. rebars to verify proper embeddment entirely into competent compacted soil. Lakeshore Engineering ~ I I I I I I I I I I I I I I I I I I I October 24, 2000 Project No.:00-030.COM Page Six SLOPES AND EROSION CONTROL The constructed onsite cut and fill slopes, pitched at least 2:1(H:V) or flatter, and below 30 feet in height are considered to be grossly stable from deep seated failure. However, due to the sandy nature of the onsite soils, it is our opinion that existing slope faces are sensitive and susceptible to surficial erosion. In order to mitigate surficial ground erosion, the following recommendations are presented: 1. Slopes should be planted as soon as possible with vegetation which is drought resistant and whose root system extends a minimum of 18 inches into the slope face. Immediate planting of the slopes is particularly important where relatively loose sand is exposed. 2. High water content in slope soils is a major factor in slope erosion or slope failures. Vegetation watering should be such that a uniform near optimum content is maintained year-around. A landscape architect should be consulted in this regard. 3. Shrub and/or tree root excavations should be minimized in size so that water will not collect and cause saturation of the surficial materials. Also, back cuts for tree wells are geotechnically inadvisable because they create a localized over-steepened condition. 4. Excavated slope and footing soils should not be spread loosely on the slope face. Burrowing Animals should be controlled because burrows become avenue for water penetration. 5. All berms should be regularly maintained. Surface drains should be kept free of debris at all times. 6. Seemingly insignificant factors, such as recreational abuse (e.g., motorcycles, BMX cycles, etc.), human trespass, small concentrations of uncontrolled surface/subsurface water, or poor compaction of trench backfill on slope can result in major erosion and slope distress. DRAINAGE Positive drainage should be provided around the perimeter of all structures to minimize water infiltrating into the underlying soils. Finish subgrade adj acent to exterior footings should be sloped down and away to facilitate surface drainage. All drainage should be directed off-site via non-erosive devices. Lakeshore Engineering <1 I I I I I I I I I I I I I I I I I I I October 24, 2000 Project No.:00-030.COM Page Seven The homeowner should be made aware of the potential problems which may develop when drainage is altered through construction of retaining walls, patios and pools. ponding water situation, leaking irrigation systems, overwatering or other conditions which could lead to ground saturation must be avoided. ADDITIONAL GRADING The project soil engineer should be notified prior to any fill placement, regrading of the site, or backfilling of trenches, after rough grading has been completed. This report is limited to the earthwork performed through July 22, 2000, the date of our last inspection and testing of compacted soils. Any future appurtenant structures such as buildings, office, barn, spas or pools, etc., the approved plans should be reviewed for prior to construction. a detached garage that are not shown on subgrade suitability CLOSURE Our findings have been obtained professional engineering practices engineering. This warranty is in either express or implied. in accordance with accepted in the fields of geotechnical lieu of all other warranties, It has been our pleasure to be of service to you on this project. If you have any questions, please contact this office at your convenience. Respect- LAKES.If9~:? .. <, / ,.'<'/' ,,~), ml'VQ r/I~'::' I", , (~ ' ". \~ Enclosed: 1) PLOT PLAN, FIGURE 2 2) SUMMARY OF FIELD DENSITY TEST RESULTS 3) REFERENCE GRADING PLAN Lakeshore Engineering \<0 I I I I I I I I I I I I I I I I I I I PLOT PLAN I ~.... " . )., .- Ijj" . ~I I I ~r LI,I;,' ' 'r I , /. '" ~f>..~ "'~'\~'DtJ \..Dv "\ ~ I "'!) o , , X Lr)/ 4'..... ~, . '7 '. - l' 'It' . $'. eo,; , ~ r..r::. w..r;" .D~..f ,f;t. . " .' ,~~ _\, z~...~~'" EXPLANATION Jtf ~.~. @ . <I"~~~AL~. 'E':, X-9 APPROXIMATE LOCATION OF DENSITY TEST ~ APPROX. LIMITS OF COMPACTED FILL INSPECTED --.d li S ~ .., LAKESHORE Engineering SINGLE FAMILY RESIDENCE LOT 156 TR 3883 VIA VAL VERDE SINGLE FAMILY RESIDENCE Project No: 00-030.c Oate 10/24/00 CONSULTING CIVIL. ENGINEERS Rgure No: 2 'Iv ,. I I . . I . . . I . . I . . . . . . SUMMARY OF FIELD DENS\TY TESTS FIELD ~ ""~ DATE ELEVA REFER- MAXIMUM 25F TEST OF TION EfleE DP.Y HATER DRY ~ .;."- ,,'> u LOCATION '(~""t-<" RENARKS coP: NO. TEST (feet) CURVE DENS !TY CONTENT OEI,S!TY ,<-,,"?- <::s~ ~~ -lC (pef) (%) (pef) ~ <:.; V> = I JOIL KE"IwA't' -+'2... A 12.11.'0 1.3 IlG.O QO / 2- ID/l. KE'f (DA 'f t4 A I~~.O q.O 1J~'O ~H. / 3 [014- k~'l uHW' I s.uJPe tC:. A IZ~o b.3 1'2 '3.0 orb V of 1c>/.4,- s,wPE.. t~ A 12$.0 7,0 121.c;' ~s V 5 ID/4 SLDf'E... . tlo e/'~ llQ.o g.l.. 115".3 or, V ,6 lolll ~U)~E. t II B 110,.0 Q'7 lo1.l:, qL / 7 loll/ SLDPE + r~ €>. IICr.O 10'( 101.3- C}o / ~ /0)2.4 ~ftrD t:=.(O .. A i,,~o \1.'3 In.S' qZ I '7 10}2.1.( (::>f'I () , 1=='(;. A. t'zg.o II.g 115.S qo / ~ ref:. R2btu. M'I Q\.(.~ flu... ( e;xPOl.tUl ~ ~ !M.lf'OtL"T DllOrr. .LAKESHORE LOT 156 TR 3883 \l- Engineering VIA VAL VERDE PrQ/. No' DaN' Tabl., 3 Consulting Civil Engineering and Geologists 00-030.C 10/24/00 \ I "1 .. 'f 1=4 'f, fa ~g~\ f 'V ., ~[\ ~ ~\ , 'J ~ -, ; f~. \' . \ .', ~ tt _ ~ ... ~ ~ -\ .' ~.lj""!. , ,~", o I " , "" e , _:.. \.J ',:1:. " U, Ii Ii J~ rl ~IIIH Ii _' j!i: 11 It ~! H I l; al~ ~~ L I ql t: h ~I '.!1 ; f Hi j':'t I .f I; I! h Pi r iPh l~ I ~ H ~; II It 1 ! Ii i' "Ii H -' . U ~: [Ii I I Ii' I 11'1 ~t I ~1 ~ I tl; ( · U, alii i} . i ~ ~ I It ;1 H ~ !,! ~i ! 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