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HomeMy WebLinkAboutTract Map 3646 Lot 1 Rough Grading Compaction Report I I I I I I I I I I I I I I I I I I I LAKESHORE Engineering ~~\ ~,O~ ,\ 1,r j\f L'Z>' CA7'C, Consulting Civil Engineers March 24, 2000 Project No: 99-099.CL Attention: City of Temecula Building & Safety, Public Works Department Client: Mr. Aaron Smith (909) 695-5277 46701-A Pal a Road Temecula, CA 92592 RECEIVED MAR 27 2000 CITY OF TEMECULA ENGINEERlNG DEPARTMENT SUbject: Rough Grade Certification Letter Lot 1 of Tract No. 3646 Vallejo Road, City of Temecula, CA. A.P.N. 922-190-012/ LD99-246GR Ref: Grading Plan by Lakeshore Engineering Dated 11/10/99, 30 Scale, P.N. 99-099.GP Gentlemen: Per your request, Lakeshore Engineering has conducted a site inspection on the afternoon of March 24, 2000. The purpose of our inspection was to verify that the rough grading operation is now completed, and constructed pads are considered suitable for its intended use. Our site inspection indicated that the rough grading is now completed and in substantial compliance with the approved plan on file. No major deviations were noted in the field when compared to approved grading plans, except as noted hereon. The building pads (main house and detached guest unit), were graded to within 2/100 tho elevation of designed grades (elev. 1028.50 and 1027.0), respectively, with reference elevation of 1031.50 taken from edge of pavement at driveway approach. Onsite cut and fill slopes were manufactured per plan. This letter is to certify that the rough grading operation for the subject site is now completed with respect to location of cuts and fills. The site can now be considered suitable for its intended use. 31520-B Railroad Canyon Road. Canyon Lake, CA 92587 . (909) 244-2913 . FAX: (909) 244-2987 I I I I I I I I I I I I I I I I I I I LO ctq-ZA' ~ ROUGH GRADE COMPACTION REPORT PROPOSED SINGLE FAMILY RESIDENTIAL CONSTRUCTION PARCEL 1 OF PARCEL MAP 3646 VALLEJO AVENUE CITY OF TEMECULA COUNTY OF RIVERSIDE. CALIFORNIA FOR MR. AARON SMITH PROJECT NO. 99-099.COM DATED: MARCH 24. 2000 Lakeshore Engineering I I I I I I I I I I I I I I I I I I I LAKESHORE Engineering Consulting Civil Engineers March 24, 2000 Project No. 99-099.COM Client: Mr. Aaron Smith (909) 695-5277 46701-A Pala Road Temecula, CA 92592 SUbject: Rough Grade Compaction Report Lot 1 of Tract No. 3646 Vallejo Avenue, City of Temecula, CA. A.P.N. 922-190-012/ LD99-246GR Ref: Soil and Foundation Report by Lakeshore Engineering Dated 11/29/99, P.N. 99-099.PI Gentlemen: INTRODUCTION This is to report the results of our field density tests and observations made during the placement of compacted fill on the subject property. PeriOdic field density tests and site grading observations were provided by a representative of Lakeshore Engineering to check the grading contractors on compliance with the approved grading plans and pertinent earthwork 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 earthwork 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 field and laboratory test results and observations of the grading procedures used, and represent our engineering judgment as to the contractor's compliance with the jOb (earthwork) specifications. BACKGROUND INFORMATION The property was a vacant lot prior to being rough graded. The surrounding neighborhood consists of a scattering of custom built, upper class, single family homes. The lot fronts Vallejo Avenue and the terrain is gentle rolling, with less than 10 percent pitch. A grading plan and geotechnical (soil and foundation) investigation report (both prepared by Lakeshore Engineering) were prepared for this site with the intended purpose of developing two single family residential units. \ 31520-B Railroad Canyon Road . Canyon Lake, CA 92587 . (909) 244-2913 . FAX: (909) 244-2987 I I I I I I I I I I I VICINITY MAP LAKESHORE Engineering SINGLE FAMILY RESIDENCE VALLEJO AVENUE TEMECULA, CA. AARON SMITH'S PROPERTY Project No: 99-099.C Dote 3/24/2000 CONSULTING CIVIl:. ENGINEERS N N.T.S. z,. Figure No; 1 I I I I I I I I I I I I I I I I I I I March 24, 2000 Project No. 99-099.COM Page Two PROPOSED DEVELOPMENT Proposed site development consists of the preparation of two level graded building pads, for the construction of single family homes. A larger house pad centrally located on the lot with a guest unit (to the east) are planned for construction. Construction will likely be upper scale, custom designed, one and/or two story structures, of conventional, wood framed and stucco construction, with tile rOOfing. Foundation will be conventional spread footings with concrete slab-on-grade flooring. Pad drainage is by sheetflow and surface swales around building, exiting flows into a natural gully located at the easterly property line. Both the proposed referenced grading plan and soil report were used in the field to aid the grading operation. Xerox copy of grading plan is attached in the back of this report. ROUGH GRADING OBSERVATION AND TESTING Rough grading operation commenced on the later part of February, 2000, interrupted by intermittent rains, and concluded on March 22, 2000, the last day of our field inspection and compaction/density testing services. Grading was performed using rental equipment, consisting of a paddle wheel, water truck and dozer (D-6 equivalent) with sheepsfoot. Grading was conducted under the jurisdiction of the City of Temecula. The rough grading operation was observed to be performed in the following manner: I. Surface vegetation and debris (organic) were removed/cleared from the areas to be graded. 2. Unsatisfactory soils were excavated to expose competent materials on which to start the fill. The maximum depth of fill placed during this grading operation was in the order of 5 vertical feet, at the easterly corner of the guest unit pad. 3. All bottom of substandard soil removal/excavation were inspected and deem competent prior to fill placement and compaction. The native soils exposed at the bottom of overexcavation were inspected and in our opinion, considered suitable for support of new fills. Prior to placing any fills, the exposed bottom subgrade was scarified and moisture conditioned. Lakeshore Engineering ~ I I I I I I I I I I I I I I I I I I I March 24, 2000 Project No. 99-099.COM Page Three 4. Minimum equipment size keyway of about 13 feet wide by 30 inches deep were excavated along the toe of fill slope, exposed bottom inspected and deemed competent prior to the construction of fill slope. 5. Approved soils were placed in layers on the prepared surface, and each layer was compacted to the specified density before the next layer was added. The exposed bottom of overexcavation was scarified another 6 inches, moisture conditioned prior to placing fill. 6. The minimum acceptable degree of building fill dirt compaction was 90 percent of the laboratory maximum dry density. 7. Maximum density and optimum moisture content were determined by the A.S.T.M. D1557-78 method. 8. Field density tests were performed utilizing the drive tube and sandcone methods. 9. The soils used in the compacted fill consisted predominantly of on-site light brown, Silty SAND (SM/ML). 10. Both house pads were capped with about 4 feet of compacted fill blanket. Limits of overexcavation extended 4-5 feet beyond building footprints. 11. Field density tests were made during the placement of fill to determine the degree of 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 compacted fills placed and inspected during this grading operation. GRADING DEVIATIONS FROM APPROVED PLAN At the conclusion of rough grading, no major deviations were noted in the field when compared to approved grading plans, except as noted hereon. It is understood that fine grading will be needed at end of building construction to defined parameter swales, flowlines and slope berms inplaced. A.. Lakeshore Engineering I I I I I I I I I I I I I I I I I I I March 24, 2000 Project No. 99-099.COM Page Four LABORATORY MAXIMUM DENSITY COMPACTION TEST 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: Type Soil Description Optimum Moisture Max. Dry Densitv A Silty fine SAND (SM/ML) 10.5 % of dry wt. 122.0 P.C.F. LABORATORY EXPANSION TEST Laboratory Expansion Index Tests were performed on representative soil samples recovered from within the proposed building areas near the completion of rough grading. The laboratory expansion test was performed in accordance with U.B.C. Test Method 29-C, and the pertinent test results are presented on the following page: Soil LOCATION Depth Moisture % Before Test Expan. Index Expansion Potential Pad A & B F.G. 8.0 42 LOW/MEDIUM Based upon a test results obtained, the subgrade materials are considered to be LOW/MEDIUM IN EXPANSION POTENTIAL. In that regard, Lakeshore Engineering recommends that the upper 12 inches of subgrade be pre saturated to at least 120% optimum moisture content, prior to slab-on-grade pour. Concrete slabs should be 4 inches thick and reinforced with #6x#6-10x10 W.W.M. or # 3 rebars at 18 inches on center. Cold jOints should be placed at no further than 14 feet apart, in either direction. SULPHATE CONTENT TEST A Laboratory sulphate content Test was performed on a representative soil sample recovered from within the proposed building area at the subject site. 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 Depth Sulphate Content Recommended Cement ~ PADS A & B - 611 <150 ppm. Portland Cement TYPE 11 (2,500 psi concrete) Lakeshore Engineering 6 I I I I I I I I I I I I I I I I I I I March 24, 2000 Project No. 99-099.COM Page Five 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 shown on the Plot Plan, figure no. 2 attached has been placed in accordance with the applicable portions of the grading specifications and in accordance with the City of Temecula adopted Ordinance. Any fill dirt added beyond the limits or above the grades shown on county approved plans 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 soil report. Based upon our field testing results, the compacted fill in our opinion has been compacted to at least 90 percent relative densities. Proposed foundation should be constructed and reinforced as follows: FOOTINGS Footings should be founded at least 18 inches below lowest adjacent ground surface for proposed bUilding. Minimum width of footing is 18 inches. All continuous foundations should be reinforced with at least 2 rebars (#4), one located at top and one at bottom and consistent with the recommendations of the Structural Engineer. FOOTING PLACEMENT AND TRENCH INSPECTION Due to periodic site inspections conducted during rough grading operations, footing trench excavations should be inspected by a representative of Lakeshore Engineering prior to concrete placement to verify proper embeddment either entirely into competent fills. CONCRETE SLAB-ON-GRADE The local subgrade soils are considered LOW/MEDIUM in expansion potential (E.I. 42) as verified by our laboratory test results. The 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 clean sand cushion to prevent punctures and aid in concrete cure. Lakeshore Engineering recommends that the upper 12 inches of subgrade be presaturated to at least 120% optimum moisture content, prior to slab-on-grade pour. Concrete slabs should be 4 inches thick and reinforced with #6x#6-10xl0 W.W.M. or # 3 rebars at 18 inches on center. Cold jOints should be placed at no further than 14 feet apart, in either directions. Lakeshore Engineering ~ I .. . I I . . I I I I I . I I I I I I March 24, 2000 Project No. 99-099.COM Page Six SLOPES AND EROSION CONTROL The constructed fill and cut slopes, pitched at less than 4:1 (H:V) and in the order of less than 7 feet high are considered grossly stable and suitable for its intended use. The onsite granular soils (fine sand and silt mix), are considered sensitive to surficial erosion. In order to mitigate surficial 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) All berms should be regularly maintained. Surface drains should be kept free of debris at all times. 5) Excavated Slope and footing soils should not be spread loosely on the slope face. Burrowing animals should be controlled (burrows become avenue for water penetration). 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 backfills on slope can result in major erosion and slope distress. Lakeshore Engineering '\ I I I . . . I I . I I I I . I I I I I March 24, 2000 Project No. 99-099.COM Page Seven DRAINAGE Positive drainage should be provided around the perimeter of all structures to minimize water infiltrating into the underlying soils. Finish subgrade adjacent to exterior footings should be sloped down and away to facilitate surface drainage. All drainage should be directed off-site to natural swales/gully to the east. 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 consultant 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 March 22, 2000, the date our last site inspection. Any future appurtenant structures such as a detached garage buildings, home office, barn, spas or pools, etc., that are not shown on the approved grading plan should be reviewed for subgrade suitability and permitted separately by county prior to construction. Our findings have been obtained in accordance with accepted professional engineering practices in the fields of geotechnical engineering. This warranty is in lieu of all other warranties, either express or implied. -j Enclosed: 1) Plot Plan, Fig. 2 2) Summary of Test Results 3) Xerox reduction of Grading Plan cc: 1 copy to city 2 copies to client ~ Lakeshore Engineering PLOT PLAN 1J('l.vnJ b'I, ~ <OJ " I 't. / -:',/. ~, \ '-. - \ I~ F 'T ~ Fl, n.Q.ox \ . I \ ' \, 5'o&~ J4. -n " ?sf;T?f "lsV( I""...., ~ ". ---t~' ,.J'. _ .0' l ~O;;o:;;. ~~l~ OF I' II \ . , . PL. ..''i\ll'~ f\\.T. ';....Al1:.lL. (~':i~ b .._. , l,.HTl. ,oi! ~ - "\I 5'Nt:" ^~ 0.".:.0. r>~"'''' EXPLANATION: _ -.l JQ, N f>,\.. I _LIe _(10 N.T.S. _(, w ;1.0,- ,,4:1 6~~ SOlllIllM., \lu.H ~ 'j 'o...~ l} I t, < / ; ~, /, "^ / vp' ~i.\O..,\:;, ....~. \,~-I'~"/" :;. , }7\~-<"':"-- ti-S% ..,p -1./ r ". -;-~ ,/ .... - ~ ---:) . ~ ..,... I E::x6.i' (j)..1;~ 10 &: S~',_ -+ V~\f'JOil;O Ml ~t~, -.-.- ~'C QtJ0t=A('/1/lIAO>I PW-- -, ~. . X-9 APPROX. LOC. OF FIELD DENSITY TEST APPROX. LIMITS OF FILL PLACEDIINSPECTED LAKESHORE Engineering CONSULTING CIVIL ENGINEERS SINGLE FAMILY RESIDENCE VALLEJO AVENUE TEMECULA, CA. AARON SMITH'S PROPERTY C\ Project No: 99-099.C Dote 3/24/2000 Figure No: 2 I I . I . I I I I I I I I I I . I I I SUMMARY OF FIELD DENS ITV TESTS DATE ELEVA REFER- MAX IMUM FIELD ~ ~3 <\;\ ,,'<- ,,~ o~ TEST OF TION ErlCE DRY \,A TER DRY u LOCATION \: :\ " 't-" RENARKS ~ NO. TEST (feet) CURVE DENS !TY CONTENT OEr~S!TY ,,'<- "'-~ 9::: (pef) (:-;) (pef) <<:-'<: ,,<0 ao::;: ",- I 317 1<.E.'l ,WA"I. t'Z.. A /11..0 (-z..b lo'1L qc I z 314 PAD 1=1lJ...>. -+1.. A 1'21..0 1(".3- l1ot. b ~I / 3 31~. PM) t:lll ~ . +..s . A 11.'2.() 1'2.() ,13.5 q3 1'2-€1'e:>1 Of -l} '2. / 4 3.IQ, 2 n~l U ~rT PA'f). -!-2- A 17.2.0 1'.5 110.0 Cjo 1/ 5 .)\'2.1- hMlt\t.J PAr-.. l + 4Ii. R,~ A 17'2.0 cVL Ill..1 0,0 / b 31'2.1.. ,'\1,,\10 PAD ( v) r:.b. A 112.,0 <4'3. In'5. '1f / 1 3\n G.Ut:S:T. P1'\D (t 3'i) F- b. A \,2;2,0 g'7 ~n'b q( / ~ 'SI-Zl. G(.(5T. 1>f\D ( v) f._ . A \?-u () 9,,7 \1'7.2.. Off / ~ ~(n ~LDl'E-1 PM> F.(", A. 11.2..0 ~ ,I 11,.2- ql / -)( F,r\)I~E{) (../ZAOE: -~ Fe~ b\,(,l2.F ~ (;/2 ~C>E.. . z. . .LAKESHORE VALLEJO AVENUE TEMECULA. CA. \0 Engineering AARON SMITH'S PROPERTY PrqJ. No: Date' Tabl,: Consulting Civil Engineering and Geologis\S 99-099.C 3/24/2000 3 . 'ObIOa ~v" - . Jo'I.lllVS ~V '"1I1I.l ~.- ~-~. - ....-:..-- ;/ ! n I !i !Ii! i 1 jl,llh ~l' II! I .Rf Ii,l~~}ll! t i I J II' ,ntj IliJllitiJ"Jj!' iil t, lil"'llill,l~ !.' II!! f1!J f .lf~..j1 0 P~~!"I' I] ~ 1111 ~ II J" ill if jlll , 11 i It. +1 f ! hiljl lit i JJ J 'I hi' Ad -fIt ! . 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