The URL can be used to link to this page

Home My WebLink About; Stagecoach Park Grading; Stagecoach Park Grading; 1986-11-24TESTING AND OBSERVATION SERVICES FOR STAGECOACH PARK CARLSBAD, CALIFORNIA FOR CITY OF CARLSBAD CARLSBAD, CALIFORNIA D BY GEOCON, INCORPORATED SAN DIEGO, CALIFORNIA NOVEMBER, 1986 GEOCON INCORPORATED Geotechnical Engineers and Engineering Geologists D File No. D-3480-J02 November 24, 1986 City of Carlsbad 1200 Elm Avenue Carlsbad, California 92008 Attention: Mr. Mark Steyaert Subject: STAGECOACH PARK CARLSBAD, CALIFORNIA REPORT OF TESTING AND OBSERVATION SERVICES DURING GRADING OPERATIONS ADJACENT TO MISION ESTANTIA Gentlemen: In accordance with your request and our proposal dated August 26, 1986, we have provided testing and observation services during the construction of a stability fill adjacent to Mision Estantia on the subject site. Our services were performed during the period of October 4 through October 27, 1986. The scope of our services included the following: 0 Observing the grading operation, including engineering geologic observation of shear key excavations and installation of subdrains. • Performing in-place density tests in the placed and compacted fill. e Performing laboratory tests to aid in evaluating the compaction, shear strength and expansion characteristics of various soil types encountered. e Preparing this report of grading. GENERAL The grading contractor for the project was Frank Wright & Sons, Incorporated. The grading was performed in general accordance with the revised grading plans prepared by Rick Engineering Company, undated and "Stagecoach Park Consultation" prepared by Geocon, Incorporated, dated June 20, 1986. 9530 Dowdy Drive San Diego, CA 92126 619 695-2880 File No. D-3480-J02 November 24, 1986 The project soils report is entitled "Geotechnical Investigation for Stagecoach Park, Carlsbad, California" prepared by Geocon, Incorporated and dated July 5, 1985. References to elevations and locations herein were based on surveyor's or grade checker's stakes in the field and/or interpolation from the referenced Grading Plans. GRADING After completed shear key excavation and installation of chimney and collector subdrains, the exposed natural ground surface was scarified, moisture conditioned and compacted. Fill soils derived from on-site cutting operations and import sources were then placed and compacted in layers until the design elevations were attained. The slope face was overbuilt a minimum of 3 feet and trimmed back to finish design elevations. During the grading operation, compaction procedures were observed and in- place density tests (ASTM D1556) were performed to evaluate the relative compaction of the placed fill. Field observations and the results of the in-place density tests indicate that the fill has generally been compacted to at least 90 percent relative compaction. The results of the in-place density tests are summarized in Table II. The approximate locations of the in-place density tests are shown on the site plan, Figure 1. Additional in-place density tests performed during ongoing grading operations within the park site (subsequent to our most recent grading report dated June 19, 1986) have also been included within Table II. Laboratory tests were performed on samples of materials used for fill to evaluate moisture-density relationships, optimum moisture content and maximum dry density (ASTM D1557-70, Method C), expansion and shear strength characteristics. The results of the laboratory tests are summarized in Tables la, Ib and Ic. LIMITATIONS The conclusions and recommendations contained herein apply only to our work with respect to grading, and represent conditions at the date of our final inspection, October 27, 1986. Any subsequent grading should be done under our observation and testing. As used herein, the term "observation" implies only that we observed the progress of the work with which we agreed to be involved. Our conclusions and opinions as to whether the work essentially complies with the job specifications are based on our observations, experience and testing. Subsurface conditions, and the accuracy of tests used to measure such conditions, can vary greatly at any -2- File No. D-3480-J02 November 24, 1986 time. We make no warranty, expressed or implied, except that our services were performed in accordance with engineering principles generally accepted at this time and location. We will accept no responsibility for any subsequent changes made to the site by others, by the uncontrolled action of water, or by the failure of others to properly repair damages caused by the uncontrolled action of water. If there are any questions regarding our recommendations or if we can be of further service, please contact the undersigned. Very truly yours, 3N, INCORPORATED James E. Likins ]E 17030 JEL:MWH:JJ:bmc (6) addressee Michael W. Hart CEG 706 John Juhrend Project Engineer -3- File No. D-3480-J02 November 24, 1986 TABLE la Summary of Laboratory Compaction Test Results D Sample No. 1 2 3 4 5 6 ' 7 8 9 ASTM D1557-70 Description Dark brown, Silty CLAY Yellow- tan, Silty SAND Dark brown, Silty-Sandy CLAY Yellow- tan, Clayey SAND South-Coast Class II Base Material Green- tan Silty SAND Tan-brown, Sandy CLAY Green, Silty CLAY Yellow-brown, Silty SAND Maximum Dry Density pcf 116.8 121.0 121.9 129.1 140.9 118.3 120.0 115.0 114.4 Optimum Moisture % Dry Wt. 12.5 12.4 10.3 11.0 7.7 11.7 13.3 16.3 13.1 File No. D-3480-J02 November 24, 1986 TABLE Ib Summary of Direct Shear Test Results Sample No. 2 3 4 6 7 9 Dry Density pcf 108.9 109.5 115.9 107.3 108.9 103.3 Moisture Content % 12.4 10.9 11.1 10.8 12.6 12.7 Unit Cohesion psf 290 270 180 150 320 130 Angle of Shear Resistance Degrees 31 13 31 30 18 29 TABLE Ic Summary of Laboratory Expansion Index Test Results Moisture Content Before After Sample No. 1 2 3 4 Test % 13 10 12 10 .1 .6 .6 .3 Test % 25, 18. 27 21, .3 .5 .8 .9 Dry Density pcf 99.2 108.2 100.6 108.8 Expansion Index 46 0 85 35 •HcdCUcuPi0)CuoCO CJc.H,— 1— (cLOe"ouvHGJOi0)3 CO "rHo tnji25ci**C3Si— i0&*1?sJ_J^ U COCO ^H0 0i»o ~^f ^0 **o r^* r*^ r**1* r*^ r^ c^j r^** ^o ^o \o r***r-HLOCNjr^cNu^ cjN1"* f~^"1 cn -<i" r** ^o <d~ 10O^ O^ O*» O^ O^ O^ IQQ (7^ ^ O*» ^ co O^ CT\ 0**C*OCN] O^OOCOO>»<l'O^Orr)iOiO'— ICO LO LO CN1 CO CO "sT *d" CS <I" Q\ ^f ^D O ' — 1 "*d" . CO / — * "C CJ3 •H 5u CDiJ rH 3 CO0)ei jj COcu H ^-1 -H COc Q u-i CJ O C 0 TH 1J ij QJre cu P^ U-i CJ ^— 'fcd co co in co CM o^ <r '<f o *«o <r r^- <r vo r^- r^CMOOCOOCOrs-OO"\CMCMCMCO'— ICOOCMOO*— <»-HOOO' — '' — 'O1 — it— (i — i *^j" in ^ r*** CTi »— i co co *3~ co in r^ r^« CTi >^j" CMCMCMCMCMCOCMCMCOCMCMCMCMCMCOCMCMCMCMCMCMCMCMCMCMCMCMCMCMCM •a cu—iu- Io00srcoIQ •H Fn Location4J CO • CJ O H 2 CD reco rv. o O Or^ in o in o3 *-3 t3 t-3 \£> \j~) co P*«CM CM CM CM cd 4J O Oco r ; : co m t-c3 ^3 rH t — 1 ^O l~->. •H .r ; r CM CM fn . •>-. to 4-1 ' 4->•H cot— 1•H : ; = a) r rQ CU rd O 4-J T— i CO ^ = = CO Z r— ^ C\J CO <T LO VO P^ p^ pj p^ p^ ryj oo iy} cn co co co vO i^~\ inCM ^3 0 CO r^ =ifc t| ] O 4-1 - COcu 4-1 0): Pi Pi PiCO CO o 00 *-3 ^o CM . cd 4-) CO CU Cuo, — 1 CO PiCO 4-1aHI6CJ COCO W a•H cd J-i P O 4-1 CO 01 — 1Pi CO \ 0o <-3 O CO f CO 4-J CO Q) D-< O rHcn rH r— 1 PiCO 0m *-3 CT\ CM CM .-1 <4-t O 4-1 = CO CU 4J CU = Pi CM CO< — I i — 1 Pi PiC/3 CO Om <-3 00 CM • CO 4-1 CO CU Cuo rH CO ^., { PiCO 0o •Ji i —CM - - m,— i PiCO J-l•Hcdft0) ftqi — i CO II Pi CO H O.-H 5~H eJoto -a OlCMu 00 CD 3 •H 4-1 OC_5s^x Mf-i M r-J <H i — i OH-Jio CO CO 1 Oz; CD rH •H UH•-H OCDCD 4-J5 >-,[T. lJ•H a cn S3 • O >J-i >-. c. ocn 4-J T-i 3 Ccn o 01 -H J-l Pi JJ CDre a) cn a)<U T-! H td >,4J T-icn C 4) •o *"H Q) (a. uj O O Ec 3 CCO O-H 4J crj O O i-J 4-1 cn • CD o H 2 o -J-J ^Ore co O CTv 0CTiV40m m r^o o CM CN 4-1 C 0)s 0)cncdw fi- *rMcd 1_( Q 6 O 4-1 CO vD T— ( Pi CO -^0 O o i — i i— i -J"o*> o^ o*\ o^ o^vO ^O CO CO vOi-O **3T "«d" vO i-O m <r vo co co r^ m oo co CMo •— i o o •— ' CM \o \o in r^CO co CO CO COCM CM CM CM CM O 0 t-3 ^OCN] O LO O O •o r^ un o aj 4-)^-b <-2I <-<3 O CO rn m )0 o T3co CM CM ro rH •H • ^5cd . <~i 4-1 ' QJCO p^ <D r r s QJ ft ft0 o •H rHco : : r co r^ co cr\ o rH i — I i — I t-H CM CMPi Pi Pi c4 pi CO CO CO CO CO ^ T— 1 > O ' 1CTi CT\ 0** O\co co c~^ inun -^* r^* co *^° r*^ oo <~H CM oo r** r^ •-H O O O oo co -<r oo CO CO CO CO CM CM CM CM O O O Oin o o o i<3 t£J (.^J <J$ co rH in m CM CO CM CM , cd4_J - ~ - CO -a •rl "~ n CL) Pi = = = CU ft0 : ~ r co CM CO -3- in CM CM CM CM CO CO CO CO CO r-H 0 oLO0 0 r^ O in CO CM oo t-3 r-- CM — — - - VO CM CO o0><r f™" < r- i^. O o<r CM in CM u3 m CM . cd 4-J 01 13 rH •rH 3 0) Pi Q) ftO rH CO ^CMPi CO ^J-,— { O CO\0CO i-H CO _, o CO<f CM Oo <<5 CT» CM — — ^ - CO CM Pi CO , — !01vOCO CM -*0 CO CM CO CM MH 0 4-1 (1) 4-1 01 Pi CTi CMPi CO COa\0o o CM1 — 1 ^. CM O 0 <-£3 ^o CM . cd 4-1 CO -a rH •H 3 <uPi a)fto rH CO o COPiCO r-l•HcflftQJPiQJftorHCO II piCO (-4 On:.— 1 5cLOS. XE rtOOJcS0)>-!CO O CO V •O iwu>, ft n en i — it — io O O ^— X *"O 0) -^ ijj o CJ 3co QJ Pi JJ CO QJH JJ•H CO C co -H JJ re> CJ , — 1tJ JJ GJ CU Li_l CNCNCNCNCNCNCNCNCNCNCNCNCNCNCN td 3 3 C CO O -H -LJ tSoo ^ o 31o o o o oo o o o oa 03 «3 <« CTi r-^ CO CT» C-~) CN CN CN a!JJco r r : -a •H.3 r z - rOa)pi a) = - rft 0 rHco : ~ - CO en JJ 1 CO • O 1) 0H 2 ' — i CN cn <Ten en en enpi pi pi pi CO CO CO CO O QJ QJ •" vo rH ™ CO FV. LO ,— 4 -^ o 000LO LO o i^3 i*& <-3 -<r c?> CN CN CN en «4Jco : r T3 •H3 = = ^CU Pi 0) r s DHO rHco - r LO O f^~ Pi Pi pi CO CO CO , — 1*^ o o o 0 0 ^3 ^ O ^H nj4J CO - T3 rH •H 3 = J3 QJPi OJ rft 0 rH CO = CO CTien enpi Pi CO CO r-~. ,__4 O O LO O CN ^5 <# CN CNen en - - - ~ _ = ~ O r-H Pi PiCO CO CO T^^ o o LO ^3 ON CN 13 •H 3 J3 QJ Pi Q) ft O rH CO CN PiCO o CN O LOr~- ^g LOCN JJ CO<D H Q) ftO rH C/0 PiCO oo .-3 1 —CN 4J COQ) H QJ ft O rH CO 3CO oo •-3 tH en _J("•"!•H 3r^ OJPi QJ ftO rH CO LO<rPi CO OJ CO ooinJ-l•HfrjCXQJPi0)P.OrHCO PiCO "^ CJ 3r* J-1 O CJ — ' 1 [ M LJ15 H , — ( O 1 O 00 ro O<z QJ rH •H to—1 T-l 3to OJci iJ 10 CJ H >, ^J 1— iw H GJ £^ 'O T ^<u U-I U-lo P-, c 3 H n—1 CJ—I CioLO -3c. x:o li-wrH 0CJCS 6-S•QJ JJ^ ^•LJ ^to i-i •H Q JD to Q !-W CJ >-, C. r^ e 0 •rH iJ JJ QJC QJ P- feCJ I™"? W c Q iJreoo 0-Jto - QJ O H Z OJ• i vO rc COa o-v -3-ino\ro^J.1— ( I — 1 COCM< — i cr\ COCM O O L<3 CM CO rH •H 3" ^Q QJpi QJ Pi 0 rH CO vO CO o CM "*—s^ O r^-inC7\CO•o T—< 1 — ( ~d- rH I — 1 VO CM in CM i-3 CTi CM 4-1 CO QJ H QJ P.O rH CO r^<3- CO • — i CM *"^» O r^ r~ r~O CM CMO CTV a\•— iCO CTi vO<r <f r~- •— 1 i— 1 r— i i— i i— i i — O-i O O l-H r— 1 r-< 1 — 1 I— i I — 1 r-l CO CO CM CM CM o o o O O O ^3 ^ <-3 CM i— l CM CO CO CO 13 rH •H 3 = = rO QJ Pi OJ : =P.O1 — Ico r = 00 CTi O pi fv^ cti CO CO CO 1 —CMOACO^J.1 — 1 CM O i— li — i r^. CM CM om o3 CO CM J-lto QJ H QJ P. O rH CO r-<m to r-H0O^vOf^ r-( rH VO O1 — ( insf CM OO -3 , — 1 CO rH •H 3 ^QJ Pi QJ P, O rH CO CMmPiCO r-COCOCO<3- T— 1 1 ( vO Oi— l CO CM Oin ^ , — i CO = ^ - ^ COmPiCO CMCM -*^O r-~*,OOr^i— l vO r^ 0i — i CO CM COin *4H O tn Q) 4J QJ Pi -4-inPi CO CJ00 OCO CJ^0 0CO r~ i— i •— i CO vO m r~o Oi— i i— i <N <fm mCM CM 0 0o o <-*3 <-2J C-.) ^-1 CO CO = rH •H 3 = QJ Pi QJ = P.O rH CO : m voin inPi Pi CO CO CO CM O r-.r~.r~>O CO OC7\ CTv CT\\O CO CTlf~^ ~-J ~^ •— 1 rH t— I o in o co r- 1 r-~ O rH Oi — f i — i i — t vo CM r~-m in inCM CM CM m m CM CM '•"3 i-^J CM CMCO CO m 13 in rH - 3 IW ,-Q O QJ Pi : to QJQJ p, *-" OQ) rH = Pi CO r~- CO o^im m mpi pi pi CO CO CO r-OCTvCTi^j- i— I O ^O i — [ OCO CM Oin ^j a\CM ^JCO QJ H QJ O rH CO oVO Pi CO r~-, — i0".0COt — 1 CTv CO Oi — i 0COCM O O <-3 CM CO 4-1 03 QJ H OJ P.O rH CO , — l vOPi CO D Io CO^rroI O o2; 0) rH •H x-s "O Q) 3 C •H1 i C O U V—- M f™ 4 tair— Jca H QJ COD.,M>, r-1H cOrH QJ•H d0CO t«0. XE CO0 SCJ>UHrH OQJPi S^QJ 4-)rH 334-1 >, CO U •H Q O 2 B-S COCo • Q U-l U>> c± rHQ CO 4-} rHD C CO Oa) -H ojC£ u QJ CO QJ 4-1 > fan CO 0) OJ rHH H >>1 1 •H COCa>Q " W rH 0)"rH U< UH O >^j_j . COrr § 3 C CO O -Hj i CTiMJCJ O I-J U CO QJ O H -Z. cu ^^> 4-1 CO CO 0%o ^ in<f, — ir^'CJ<r <rCN Oca CT\<j- in as m CN rH m vo 0 rH 0 0 CN CN CN CM U CD PM PM • 00 13, — i & i— < O • •H . 4-1 (^co n r-l . —1 CJ =ir^OJ Pi MH O CN r-H 4J CN CO QJ T3 4-1 CO QJPH prf as o CO -4- <ri — i' ^ o- rH CNCN COcrv a\*£} O n CN o\ r~- VD CN O rH i~4 ir-H 0 0O vOCN -H T3 rH QJ •H PH rH rHcfl» 4_1 CO0) .3 QJ "O •H rH CO rH •H rG fe 4J !H r-H O rH 3 cO S rH 13 rH Cfl •H QJPH 33 r-H CN <r -<r o r-H — ^r-« CN r- 1 r-H r^- r~- rHCN -H r-H CO "'CO ^fCTv CT* C7N CO CJ*i CTi<— i CN cy\ o vc n -J- CO r-H CO LT) -<f in n o r-~ o oo rH \£) \£) O- r— 1 f-~ rH O O O rH O O CN co uo o> o r^- \D O O rH CN O rH CN CN CM CN CN O Pn 2 -a « 'cj •H -HPH p^, - 1 ,Zj r~i •— ' rH "3 COM ffl3CO a) |2« -H .!3 Fn CO <U rH Q.•d cn rH r e rH -H CO CO CflrH OO r-H pq pjj •H ^5 P^ rd 4-i = ^ *-> ^4-1 M m rH 5H 0 CO ^ rH 0 WOcd ,3 w : a ^ CO J2 ^ T3 rH QJ 4-1 fl CO rH 4-1 J_| g QJ -H 0) o CO33 PH pi g; - ^ j co <a- in vo r^. oo - •<)• -<r <r -<r -j- -4- ' r- rH _, ^ _ _ ^ r^. rH O CM rH CM ^"~^ ^-~ o 1^ CO r-H Ig >1rH U) 3 | IO, erf CO T i f CO 4->cna Icn OJord rH P-