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HomeMy WebLinkAbout; Arroyo La Costa, Unit 1, Lots 1 through 120; Final Report of Testing and Observation Services; 1997-11-01FINAL REPORT OF TESTING AND OBSERVATION SERVICES DURING SITE GRADING ARROYO LA COSTA, UNIT 1 LOTS 1 THROUGH 120 CARLSBAD, CALIFORNIA PREPARED FOR VILLAGES OF LA COSTA SOUTHWEST, LLC CARLSBAD, CALIFORNIA NOVEMBER 1997 In general, the in-place density test results indicate that the fill soil, at the tested locations, has a relative compaction of at least 90 percent. The approximate locations of the in-place density tests are shown on the As-Graded Geologic Map (Figures 2 through 9). Laboratory tests were performed on samples of material used for fill to evaluate moisture-density relationships, optimum moisture content and maximum dry density (ASTM D-1557-91), expansion potential, shear strength, and soluble sulfate. The results of the laboratory tests are summarized in Tables II through V. Slopes The project slopes consisted of cut and fill slopes constructed at inclinations of 2:1 (horizonta!:vertical) or flatter, with maximum heights of approximately 30 and 45 feet, respectively. A shear key was constructed at the transition, cut/fill slope adjacent to Lot Nos. 26 through 29 to remove highly fractured claystone of the Del Mar Formation. The shear key was constructed to reduce the potential for damage to the fill slope and the building pads that may occur due to erosion and sloughage ofthe cut portion of the slope. Cross Section A-A' (Figure 1) depicts the general configuration of the shear key. All slopes should be planted, drained and maintained to reduce erosion. Slope irrigation should be kept to a minimum to just support the vegetative cover. Surface drainage should not be allowed to flow over the top of the slope. Subdrains Subdrains were installed at the general locations shown on the approved grading plans. In addition, the subdrains were "as-built" for location and elevation by the project civil engineer. The subdrains generally consisted of a 6 to 8-inch diameter PVC perforated pipe placed in crushed aggregate surrounded by Mirafi MON filter fabric. The drains were typically placed at least 10 feet below grade and constructed at a gradient of at least 1 percent. During construcfion, the subdrains were generally discharged into storm drain inlet structures or onto surface grade. Where discharged onto surface grade, a concrete wall was constructed at the outlet point to protect against blockage or destruction of the subdrain outlet. The canyon subdrain outlets should be maintained regularly to prevent sediment and debris from obstructing the free flow of water out of the subdrain system. The final "as-built" subdrain locations surveyed by Project Design Consultants are shown on the "As-Graded Geologic Map" (Figures 2 through 9). Project No. 05871-12-01 - 4 - November 14, 1997 the amount of soluble sulfates within the surficial soils to determine the potential for sulfate attack on normal Portland Cement Concrete. The test results ranged from a very low to high sulfate content with corresponding "negligible" to "severe" sulfate exposure rafings. Generally, Type II and Type V cement should be used for moderate and severe sulfate ratings, respectively. Geocon Incorporated does not practice corrosion engineering. Therefore, results of these tests should be reviewed by the respecfive neighborhood developer and their retained corrosion consultant and appropriate recommendafions should be implemented during design and construction of proposed improvements. The results of the soluble sulfate tests are summarized on Table V. SOIL AND GEOLOGIC CONDITIONS The soil and geologic condifions encountered during grading were found to be similar to those described in the project geotechnical report. Moderately dense to dense, silty, fine sands and sandy silts of the Torrey Sandstone (Tt), were exposed at grade on cut lots, cut slopes, cut areas within street right-of-ways, or in canyon cleanouts. Limited exposures of sfiff, sandy claystone of the Delmar Formation (Td) were observed in the lower elevations of the site. Compacted fill soil was placed in areas of fill and is designated as Qcf on Figures 2 through 9. In addition, compacted fill soil placed in undercut areas is designated as Que. Table VII presents a summary of the as-graded building pad conditions for each lot. The enclosed "As-Graded" Geologic Map (Figures 2 through 9) depicts the general geologic conditions observed. No soil or geologic conditions were observed during grading which would preclude the confinued development of the property as planned. CONCLUSIONS AND RECOMMENDATIONS 1.0. General 1.1. Based on observations and test results, it is the opinion of Geocon Incorporated that the grading, which is the subject of this report, has been performed in substantial conformance with the recommendations of the previously referenced project soil report. Soil and geologic conditions encountered during grading which differ from those anticipated by the project soil report are not uncommon. Where such conditions required a significant modification to the recommendations of the project soil report, they have been described herein. 2.0. Future Grading 2.1. Any additional grading performed at the site should be accomplished in conjunction with the observation and compaction testing services of the geotechnical engineer of record. Grading plans for any future grading should be reviewed by the geotechnical engineer of record prior to finalizing. All trench backfill in excess of 1-foot-thick should be compacted to at least 90 percent relative compaction. This office should be notified at least 48 hours prior to commencing additional grading or backfill operafions. 3.0. Foundations 3.1. Lot specific foundation recommendations should be provided by the geotechnical engineer of record for each respective neighborhood within the Arroyo La Costa planned residential community. As-graded conditions for each lot are provided in Table VII as general guidelines to aid in evaluating foundation design. 3.2. Where buildings or other improvements are planned near the top of a slope steeper than 3:1 (horizontahvertical), special foundations and/or design considerations are recommended due to the tendency for lateral soil movement to occur. The considerations listed below should be reviewed by the respective neighborhood developer and the geotechnical engineer of record for the site improvements. • For fill slopes less than 20 feet high, building footings should be deepened such that the bottom outside edge of the footing is at least 7 feet horizontally from the face of the slope. • Where the height of the fill siope exceeds 20 feet, the minimum horizontal distance should be increased to H/3 (where H equals the vertical distance from the top of the ProjectNo. 05871-12-01 -6- November 14, 1997 slope to the toe) but need not exceed 40 feet. For composite (fili over cut) slopes, H equals the vertical distance from the top of the slope to the bottom ofthe fill portion of the slope. An acceptable altemative to deepening the footings would be the use of a post-tensioned slab and foundation system or increased footing and slab reinforce- ment. Specific design parameters or recommendations for either of these altematives can be provided once the building location and fill slope geometry has been determined. For cut slopes in dense formational materials, or fill slopes inclined at 3:1 (hori- zontahvertical) or flatter, the bottom outside edge of building footings should be at least 7 feet horizontally from the face of the slope, regardless of slope height. Swimming pools located within 7 feet of the top of cut or fiil slopes are not recommended. Where such a condition cannot be avoided, it is recommended that the portion of the swimming pool wall within 7 feet of the slope face be designed assuming that the adjacent soil provides no lateral support. This recommendation applies to fill slopes up to 30 feet in height, and cut slopes regardless of height. For swimming pools located near the top of fill slopes greater than 30 feet in height, additional recommendations may be required and the geotechnical engineer of record for site improvements should be retained under separate contract for a review of specific site conditions. ProjectNo. 05871-12-01 - 7- November 14, 1997 which we agreed to be involved. Except for the limited soluble sulfate testing of near surface soils, our services did not include the evaluation or identification of the potenfial presence of hazardous or corrosive materials. Our conclusions and opinions as to whether the work essentially complies with the job specifications are based on our observations, experience, and test resuhs. Subsurface conditions, and the accuracy of tests used to measure such conditions, can vary greatly at any 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. The findings and recommendations of this report may be invalidated wholly or partially by changes outside our control. Therefore, this report is subject to review and should not be relied upon after a period of three years. If you have any questions regarding this report, or if we may be of further service, please contact the undersigned at your convenience. Very truly yours. GEOCON INCORP RCE 22527 PAT:DFL:dmc Patrick A. 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CT CT* CT ON o CO CM in CT 00 CT 00 m o* o o oooo CTl CT* CT CT rH O O CN ON ON CTN CT* vD in m pv ^ rH rH rH o in o rH in in pv ON in m CM rH oooo CT CT CT ejN m CM CN CM ON ON (CTl (JN vo -d- vd- m m rH -d- O OOOO ON CT CT CT CT rH CM O CT CT CT ON rH CT 00 rH rH O O rH CT oo CO CT CO pv CN 00 vd- ON rH rH vd- rH VO <30 O O O ON mmmm -d- -d- Hj vd- <t en cn G O O O rH m m m CM rH in in o rH O O rH CN in in CN CO 00 o vd- rH O rH O in in in in vd- vd- vd- m rH rH rH rH in in in o m vd- vd- m rH rH rH rH oooo CN CM CN m m m m -d" o o o in in m m in rH rH rH rH rH rH rH rH oooo oooo CN CN CN Csl CT O O pv vd" CM CM rH in in in o rH rH rH CN OOOO O O O rH CM CN CN rH pv vd- vd- O pv O rH m ffi CJ td CQ 3 CQ PJ o in in o CN rH rH CN rH rH rH rH OOOO rH CO 00 rH 00 vd- rv. rH m -d- vd- in o o o in CN CM CM rH rH rH rH rH oooo rH rH rH O rH rH rH CM VD rH pv iH in VD VO CM rH rH rH rH -d-l-l in vf m pv pv 00 00 ON CT in vo pv CO ON O rH CM -d-m < m m m CM CM CN CM CN CM •vf vd-vf vd-vd-in in in vf H Vi H H H H H H H H H H H H H H H H H H O < O O o o O O o O o o O O O o o O o o rA OA rJ rJ l-J rA 1-1 1-1 rA rA rA rA rA 1-1 rA l-l rA rA rA id rH rH rH rH rH rH rH rH T-t rH r-t rH T-t rH rH rH rH T-t rH rH P P P P p P P P P P P P P P P P P P P P pv pv pv pv pv r-v pv pv pv rv rv rv pv pv pv rv pv rv rv rv CT "v ON -V CTN Vv CT Vv CT -v^ CT -v^ CT -v^ CT -v tr v.. 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VO O VO VO CT CO -d-Csl Csl Pv VO m in CO in o O O pv ON vd-o CO CT 03 >^ c: a 1 •H JH <u Cu 1 pv O in vd-in m Pv vd-pv -d-vd-pv rH -d-VD rH 00 CO pv vd-in VO VO CO PH Q a v..' 1 o o o o o o o o o o o o o O o o O o o O o o o O 1 rH rH rH rH rH rH rH rH rH I-H rH rH rH rH rH rH rH rH rH rH rH rH rH rH 13 • 01 4J •rl CU O o s m in in in -d^ vf -d- -cf in un in in -d- -d- <t -d- in m in in •d- vd- vd- -d- un in in in vd- -d- vd- -d- in in m in vd- vd- vd- Vd- rH rH rH rH in tn in in vd- -d- vd- -d- cn 4H >^ G o H <u cu td rA CQ < H CJ O I CN pv CO in o o Z 4J O tU •r-l O JH OA Vi H 1-1 P cn td OS H cn PJ H >^ H hH cn Z PJ a 1-! td hH ClH cn = ^ 3 vd- o X-S rH \ O dp cu m cd ^ X ti x-v cu 4-1 JH tU ^ o c:i c o •r-l 4J cfl o o 1-1 ti tn (U H eu 4J CO a ti cn tu o H Z in o o o in in in in oooo O 00 00 CO CM rH rH rH vD in in CM CjN pv pv pv rH rH rH OOOO in in un in oooo CO CO 00 CO vd- vo o CO pv 00 CT CO oooo in un in in OOOO CO CO CO CO CM CO vo in pv pv pv 00 OOOO in in in m oooo CO CO CO 00 pv rv. 00 00 rv rv 00 rH OOOO in in un in OOOO 00 CO 00 oo oo 00 ON CN rH 00 rv 00 oooo un in un tn OOOO CO CO CO oo in CO CN vo 00 CO 00 CO CT rH rH rH rH OO ON rH ID -d-in vd-pv pv m CO 00 •<f -d-vd-in VD VO in m rH rH rH rH in in vD CO 00 00 co 00 CO CO CN CN CO in in in in 00 00 H H H H H H H H H H H H H H H H H H H H H H H H O O O O o O O O o o o O O O O o O O O O O o o o hJ l-J l-l l-I l-l rA id rA rA rA 1-1 l-l rA l-J 1-1 1-1 1-1 rJ rJ id rJ rA 1-1 1-3 rH rH rH rH rH T-t rH rH rH rH rH rH rH rH rH rH rH rH rH rH rH rH rH rH P P P P P P P P P P P P P P P P P P P P P P P P pv rv pv rv r-v pv pv Pv pv rv pv rv pv pv pv pv rv pv pv pv rv pv pv pv CT CT •V. CT c^ Vv CT v_ ON Vv CT Vv ON Vv CT Vv CT -v^ CT "v ON -Vv ON -Vv CT -v^ CT -V CT --V CT --V CT -v^ CT -V ON Vv ON -Vv CT Vv ON v.. CT rH Vv rH rH Vv rH Vv rH Vv CN Vv CM v m Vv pv Vv pv Vv CO Vv CO Vv CT Vv CT Vv CTN Vv CT Vv CT V. o Vv o \ rH Vv vd- Vv -J- Vv vd-v, in rH V. O Vv o -Vv o Vv O Vv O •Vv o Vv o Vv o v-v o o -Vv o O O Vv o O Vv O rH rH rH •Vv rH Vv rH rH Vv rH v-v V. CO Vv r-V pv v-v rv Vv r-Vv pv Vv r-v Vv pv Vv pv pv Vv pv pv pv Vv pv r-v Vv rv. rv pv pv Vv rv Vv Pv rv Vv pv Vv pv o o o o O O o O o o O o O O o O O O O O o o o O < <: CT CT CT o rH in vo o rv 00 ON o m m -<f in un VD rH 00 pv CO cr* O in vd-vd-pv pv CO oo rH rH rH rH vd-•<f vd--d-vd-vd-•<f VO VD 00 CO oo CT CT o o o O O o rH rH rH rH rH rH rH rH rH rH rH rH rH rH rH rH rH rH CN CN CN CN Csl Csl Csl CN CN CN CN CN CN CM CN CN CN CM CM CN CN CN CN tn E u 03 ti X) CU X! 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Pv CT -Vv pv CT ---^ Pv ON pv ON •Vv pv ON Vv pv CT •Vv pv CT •Vv r-v CT QJ cn Vv in rH Vv Vv in rH 00 rH Vv Vv 00 rH -v^ Vv 00 rH Vv Vv CO rH -V Vv CO rH -v. v-v CO rH Vv Pv CM Vv Vv pv CM -v^ Vv pv Cs] Vv Vv pv CM Vv Vv pv CN -v^ pv CN -V )te; Vv CO o Vv CO o Vv CO o Vv 00 o V oo o Vv 00 O Vv CO o Vv CO o v, oo o Vv GO o Vv 00 o Vv CO O Vv oo o Vv CO o VJ z CJ pv CO in o o Z ti o QJ O IH OH X hH PH PH P cn H cn Pd H bO G •rl G 0 •H ti X! •rA 4J X) •H G 15 O a XJ -QJ eu O JH tti 3 rH cn QJ •H IH 0 E x3 c bO tfl G •rl X3 0 > rH 0 rH E o eu CtH JH „ tn tu cti u 3 rH <u •rl JH cfl 3 CH rH •rl 4-) cfl cn CH tu 4J 4J rH tn •H QJ O tl 4J to •H cn >^rH G ti rH lU •TA •rH X3 Ol CH G G tn O 03 X3 3 •rA XJ Q> o i-i 4-J •rl O CH O > Cti o tfl (U CU 0-H E CO E CU o tu o o JH o CH 01 tfl 0 u >1 G rH 4-J u •rA !H tn o QJ eu \ T-t CL tl X3 T-t O QJ C •rA U ed tfl UA Gl CJ B3 ed 4-J CO QJ Ji H rH Cfl QJ S CU Q) O X) Ji u O cfl cfl 4J CQ eu *H CU rH O -H rH •H rH 4J cn cn cn p U QJ tl 4-> tfl cfl t3 S H S Nl cn cn cn H CQ l-J p s :3 4-) rH cn cfl o QJ :3 c: G H QJ !H H OJ U 3 U •rA to Cfl rH to U eu G 4J .H QJ tfl cfl H Q X) hd S H bO cfl C JH tti SH )H H bO 0) OJ •rH •H 4J 0X3 S S O O Q) 4J 3 QJ tU •-3 S DS cn cn cn cn H H 13 Q CJ 1-1 S "-^ S cd cn cn cn cn cn QJ rH cu >^ S ^H cfl o tn ti tti rH JH -H O O X cn cfl QJ •rl X MH 4-1 Ti bO tu G 4J •rl 4J (U C rH QJ tu cn cn QJ H !H cu o Q) CH u cfl - 4J hH tfl hH XJ Q) iJ G eu c: J-1 o C •H O 4J U to > JH X cfl H G •rl QJ XJ H OJ Q) 3 cn 4J 4J Xl cn CO o • H •rA rH O X) cn >N SH O E O 3 CO e H • rA O CU cO O rH XJ -G O tfl u cu >* N 4J •H O tn u c: OJ rH XJ Cfl 3 >i CJ- H CU 4J e c 3 QJ •H G X o cfl O >* o SH O O U 4J cfl X u u O •rA X s CO rH tn 4J - cn to 03 3 rH CO > 03 tl Ol 3 Cfl G 3 G 03 X ti 03 U cti XJ eu 4J cn •H N H o G UA cfl X 4J • ti U G 03 03 ti cfl C eu O SH U bO Ji 01 o bO O cfl JH JJ G u 03 O CJ CH )H QJ XJ CU QJ ti cn QJ 3 rH Cti > ti G 03 ti G o o QJ u 3 u Ul •rA o E 4-1 O O CH O i 4-1 to tu SH CO eu G eu X 4-J O 4-J XJ 03 X) § o u G 03 03 X H u s Ji to i-i QJ cn Oi 3 bO a 3 Cu > PJ X E G o •r-) o cfl H um •rA •rA ti ti u ad XJ st ti X Qi X G CU 01 X G 03 Ul CO o o O 03 il tu cfl H Oi X PH en \ 4J wi er >* >^ H pt Z SH u SH tl bO t3 4J 4J H QJ O hH tU 4-J de H CU •H G 01 -rA cn 4J tl •rA 01 cn QJ •H cn QJ T3 XJ •\ H G •M cfl G G U tn G G H G C cn < • TA tl 3 rH U o o 03 3 cu 03 03 Oi •H G Z Cfl Ol rH >^ U •H 4-J X) XJ 4J 4-1 XJ 03 Q rH o tJJ U 03 Cfl cfl tl G G t>s •rA hH Q H ua :s S X Cfl cn >.xl 0 ^ o H O 4-J cn QJ to bO XJ IH Oi Z iJ O U O cti ffi cfl Id cfl QJ X X > -H •H C X) U O •rA -o CU QJ H > Q QJ to u •rA •rA G U 0 03 hH Ui 03 XJ rH > CU QJ U Cfl 3 U U •rt U eu E o H G SH H c O •rH td rH PJ < pa U u Q PH hH tn 3 C u 03 3 3 cn CO 3 JH Q QJ Q OJ E 3 PJ XJ u E td cn Z Q \ O 1 1 1 1 1 1 u •ri O cd Ul •rA H 4-J CJ CJ H X a cd VH •rA X o CO Q u & 2 CJJ H z o CO G O 0 0 cfl PH CJ u hH QJ X hH < cQ u CJ a UA hH CJ E Oi CJ PH E E O cn z Q H H X hH PJ < Pu > u, PJ > td Pi CJ PH PJ PS P O >^ 1-1 PH CJ cd H PJ TABLE II SUMMARY OF LABORATORY MAXIMUM DRY DENSITY AND OPTIMUM MOISTURE CONTENT TEST RESULTS ASTM D1557-91 Sample No. Description Maximum Dry Density (pcf) Optimum Moisture Content (% dry weight) 1 Light olive brown, fme SAND, with silt 113.8 14.5 2 Light gray-brown CLAY, with sand and silt 110.0 17.7 3 Dark brown. Clayey fine SAND, with trace silt 119.0 10.9 4 Orange-gray-brown, Clayey, fine SAND, with trace silt 116.8 13.5 5 Dark yellowish brown, Silty SAND, with clay 122.9 11.1 6 Light olive-brown. Clayey fine SAND 119.0 13.0 7 Light brown, Clayey, fine SAND, with trace sih 119.8 13.6 8 Brown, Clayey, fine SAND, with some silt 121.5 12.2 9 Light brown, Silty, fine SAND, with trace ciay 117.5 13.1 10 Olive green, Silty CLAY 115.0 15.8 11 Yeilow-brown, Silty, fine SAND, with trace clay 120.0 13.2 12 Yeilow-brown, Silty, fine SAND, with trace ciay 112.5 16.0 13 Tan, Silty, fine SAND 115.2 14.7 14 Dark brown. Clayey SAND 120.6 11.0 15 Yellow-brown, Silty fine SAND, with trace clay 117.1 13.8 16 Olive brown, Silty, fine SAND, with trace clay 121.2 11.8 17 Dark brown, Sandy CLAY 118.4 12.6 18 Yellow-brown, fine SAND 115.0 14.5 19 Dark gray, Sandy CLAY 117.8 12.3 20 Yellow-brown, Silty fine SAND, with trace clay 115.5 14.3 21 Yellow-brown, Silty fine SAND 113.8 15.4 22 Light olive-brown, Silty, fine SAND 117.2 12.9 23 Yellow-brown, Silty, fine SAND 113.9 14.9 ProjectNo. 05871-12-01 November 14, 1997 TABLE III SUMMARY OF LABORATORY EXPANSION INDEX TEST RESULTS Sample No. Moisture Content Before Test After Test (%) (%) Dry Density (pcf) Expansion Index 1 8.5 21.7 114.5 5 2 9.3 20.0 112.0 9 3 9.9 20.9 109.5 4 4 9.0 21.5 112.7 7 5 10.0 21.5 110.2 7 6 10.1 25.9 109.7 20 7 10.3 21.8 109.0 18 8 8.9 23.4 112.8 24 9 9.7 23.4 112.0 10 10 9.1 22.7 112.9 2 11 8.2 20.8 116.8 2 12 10.1 22.3 110.8 47 13 9.0 21.4 112.4 6 14 10.0 24.0 109.2 13 15 9.0 20.8 113.0 12 16 9.2 22.7 113.1 12 TABLE IV SUMMARY OF REMOLDED DIRECT SHEAR TEST RESULTS Sample No. Dry Density (pcf) Moisture Content (%) Unit Cohesion (psf) Angle of Shear Resistance (degrees) 20 104.0 14.9 450 34 21 103.0 14.7 655 33 23 102.5 15.0 705 33 Note: Samples were remolded to approximately 90 percent of maximum dry density at near optimum moisture content. ProjectNo. 05871-12-01 November 14, 1997 TABLE V SUMMARY OF WATER SOLUBLE SULFATE LABORATORY TEST RESULTS CALIFORNIA TEST 417 (TEST PERFORMED BY CLARKSON LABORATORIES) LOT NOS. 1 THROUGH 120, UNIT 1, ARROYO LA COSTA Sample No. Water Soluble Sulfate (%) Sulfate Exposure Lots Represented 1 0.058 Negligible 62 through 70 2 0.026 Negligible 54 through 61 3 0.025 Negligible 82 through 92 4 . 0.014 Negligible 45 through 53 5 0.017 Negligible 36 through 44 6 0.026 Negligible 26 through 35 7 0.026 Negligible 93 through 103 8 0.046 Negligible 11, 71, 72, 74, 75, and 18 through 20 9 0.023 Negligible 5 through 10 and 12 through 17 10 0.029 Negligible 73, 76 through 81, and 116 through 120 11 0.015 Negligible 1 through 4 12 .20 Severe 21,22, and 23 12R 0.056 Negligible 21,22, and 23 13 0.015 Negligible 24, and 25 14 0.056 Negligible 106 through 111 15 0.038 Negligible 104, 105, and 112 through 115 16 0.038 Negligible Recreation Area ProjectNo. 05871-12-01 November 14, 1997 TABLE VI SUMMARY OF FINISH GRADE EXPANSION INDEX TEST RESULTS LOT NOS. 1 THROUGH 120, UNIT 1, ARROYO LA COSTA Lot Numbers Sample at Finish Grade Expansion Index UBC Classification 1 through 4 11 2 Very Low 5 through 17 9 10 Very Low 18 through 20 8 24 Low 21 through 23 12 47 Low 24 and 25 13 6 Very Low 26 through "35 6 20 Very Low 36 through 44 5 7 Very Low 45 through 53 4 7 Very Low 54 through 61 2 9 Very Low 62 through 70 1 5 Very Low 71 and 72 8 24 Low 73 10 2 Very Low 74 and 75 8 24 Low 76 through 81 10 2 Very Low 82 through 92 3 4 Very Low 93 through 103 7 18 Very Low 104 and 105 15 12 Very Low 106through 111 14 13 Very Low 112 through 115 15 12 Very Low 116 through 120 10 2 Very Low Recreation Area 16 12 Very Low ProjectNo. 05871-12-01 November 14, 1997 TABLE Vll SUMMARY OF AS-GRADED BUILDING PAD CONDITIONS FOR LOT NOS. 1 THROUGH 120, UNIT 1, ARROYO LA COSTA Lot No. Pad Condition Remarks Approx. Depth of Undercut (ft.) Approx. Depth of Fill Differential (ft.) Approx. Max. Depth of Fill (ft.)* 1 Undercut Undercut due to cut/fill transition 3 4 7 2 Undercut Undercut due to cut/fill transition 3 23 26 3 Undercut Undercut due to cut/fill transition 3 23 26 4 Undercut Undercut due to cut/fill transition 3 12 15 5 Cut Cut Lot N/A N/A N/A 6 Cut Cut Lot N/A N/A N/A 7 Cut Cut Lot N/A N/A N/A 8 Cut Cut Lot N/A N/A N/A 9 Cut Cut Lot N/A N/A N/A 10 Cut Cut Lot N/A N/A N/A 11 Undercut Undercut due to cut/fi!l transition 3 7 10 13 Cut Cut Lot N/A N/A N/A 14 Cut Cut Lot N/A N/A N/A 15 Cut Cut Lot N/A N/A N/A 16 Cut Cut Lot N/A N/A N/A 17 Cut Cut Lot N/A N/A N/A 18 Undercut Undercut due to claystone 3 1 4 19 Undercut Undercut due to claystone 3 1 4 20 Undercut Undercut due to claystone 3 1 4 21 Cut Cut Lot N/A N/A N/A 22 Cut Cut Lot N/A N/A N/A 23 Cut Cut Lot N/A N/A N/A 24 Cut Cut Lot N/A N/A N/A 25 Undercut Undercut due to topsoil 3 1 4 26 Undercut Undercut due to cut/fill transition 3 20 23 27 Fill Fill Lot N/A 27 30 28 Fill Fill Lot N/A 14 22 29 Fill Fill Lot N/A 20 31 ProjectNo. 05871-12-01 November 14, 1997 TABLE Vll (Continued) SUMMARY OF AS-GRADED BUILDING PAD CONDITIONS FOR LOT NOS. 1 THROUGH 120. UNIT 1. ARROYO LA COSTA Lot No. Pad Condition Remarks Approx. Depth of Undercut (ft) Approx. Depth of Fill Differential Approx. Max. Depth of Fill Approx. Depth of Undercut (ft) (ft) (ft.) 30 Fill Fill Lot N/A 26 31 31 Undercut Undercut due to cut/fili transition 3 27 30 32 Undercut Undercut due to cut/fill transition 3 23 26 33 Fill Fill Lot N/A 26 29 34 Fill Fill Lot N/A 23 41 35 Fill Fiil Lot N/A 12 50 36 Fill Fill Lot N/A 20 43 37 Fill Fili Lot N/A 16 33 38 Fill Fill Lot N/A 11 21 39 Fill Fill Lot N/A 2 16 40 Fill Fill Lot N/A 3 18 41 Fill Fill Lot N/A 4 24 42 Fil! Fill Lot N/A 4 27 43 Fill Fill Lot N/A 20 37 44 Fill Fili Lot N/A 17 26 45 Fill Fill Lot N/A 18 26 46 Fill Fill Lot N/A 12 20 47 Undercut Undercut due to cut/fill transition 3 21 24 48 Undercut Undercut due to cut/fill transition 3 14 17 49 Undercut Undercut due to cut/fill transition 3 7 10 50 Undercut Undercut due to cut/fill transition 3 9 12 51 Undercut Undercut due to cut/fill transition 3 17 20 52 Undercut Undercut due to cut/fill transition 3 14 17 53 Undercut Undercut due to cut/fill transifion 3 9 12 54 Fill Fill Lot N/A 5 15 55 Fiil Fiil Lot N/A 5 15 56 Fili Fill Lot N/A 4 10 57 Undercut Undercut due to cut/fill transition 3 7 10 58 Undercut Undercut due to cut/fill transition 3 7 10 ProjectNo. 05871-12-01 November 14, 1997 TABLE Vll (Continued) SUMMARY OF AS-GRADED BUILDING PAD CONDITIONS FOR LOT NOS. 1 THROUGH 120, UNIT 1, ARROYO LA COSTA Lot No. Pad Condition Remarks Approx. Depth of Undercut (ft.) Approx, Depth of Fill Differential Approx. Max. Depth of Fill Approx. Depth of Undercut (ft.) (ft.) (ft) 59 Undercut Undercut due to cut/fill transition 3 7 10 60 Undercut Undercut due to cut/fill transition 3 7 10 61 Undercut Undercut due to cut/fili transition 3 7 10 62 Cut Cut Lot N/A N/A N/A 63 Cut Cut Lot N/A N/A N/A 64 Cut Cut Lot N/A N/A N/A 65 Cut Cut Lot N/A N/A N/A 66 Undercut Undercut due to cut/fill transition 3 2 5 67 Undercut Undercut due to cut/fill transition 3 7 10 70 Cut Cut Lot N/A N/A N/A 71 Undercut Undercut due to cut/fiil transition 3 7 10 72 Undercut Undercut due to cut/fill transition 3 22 25 73 Cut Cut Lot N/A N/A N/A 74 Undercut Undercut due to cut/fill transition 3 12 15 75 Undercut Undercut due to cut/fill transition 3 10 13 76 Cut Cut Lot N/A N/A N/A 77 Cut Cut Lot N/A N/A N/A 78 Cut Cut Lot N/A N/A N/A 79 Cut Cut Lot N/A N/A N/A 80 Cut Cut Lot N/A N/A N/A 81 Cut Cut Lot N/A N/A N/A 82 Undercut Undercut due to cut/fill transifion 3 17 20 83 Fill Fili Lot N/A 10 34 84 Fill Fill Lot N/A 11 35 85 Fiil Fill Lot N/A 10 35 86 Fili Fili Lot N/A 10 34 87 Fill Fill Lot N/A 15 35 88 Fill Fill Lot N/A 27 35 89 Undercut Undercut due to cut/fiH transition 3 22 25 ProjectNo. 05871-12-01 November 14, 1997 TABLE Vll (Continued) SUMMARY OF AS-GRADED BUILDING PAD CONDITIONS FOR LOT NOS. 1 THROUGH 120, UNIT 1, ARROYO LA COSTA I I I I I I Lot No. Pad Condition Remarks Approx. Depth of Undercut (ft) Approx. Depth of Fill Differential (ft.) Approx. Max. Depth of Fill (ft) 90 Undercut Undercut due to cut/fill transition 3 19 22 91 Undercut Undercut due to cut/fili transition 3 7 10 92 Undercut Undercut due to cut/fill transition 3 5 8 93 Undercut. Undercut due to cut/fiil transition 3 12 15 94 Fill Fiil Lot N/A 23 29 95 Fill Fill Lot N/A 13 35 96 Fiil Fill Lot N/A 15 39 97 Undercut Undercut due to cut/fill transition 3 30 33 98 Undercut Undercut due to cut/fill transition 3 20 23 99 Undercut Undercut due to claystone 3 2 5 100 Undercut Undercut due to cut/fill transition 3 45 48 101 Fill Fill Lot N/A 22 55 102 Fill Fill Lot N/A 28 51 103 Fill Fill Lot N/A 25 45 104 Fill Fill Lot N/A 16 36 105 Undercut Undercut due to cut/fill transition 3 12 15 106 Cut Cut Lot N/A N/A N/A 107 Cut Cut Lot N/A N/A N/A 108 Cut Cut Lot N/A N/A N/A 109 Cut Cut Lot N/A N/A N/A no Cut Cut Lot N/A N/A N/A 111 Cut Cut Lot N/A N/A N/A 112 Undercut Undercut due to cut/fill transition 3 7 iO 113 Undercut Undercut due to cut/fiil transition 3 23 26 114 Undercut Undercut due to cut/fill transition 3 23 26 115 Undercut Undercut due to cut/fill transition 3 7 10 116 Cut Cut Lot N/A N/A N/A 117 Cut Cut Lot N/A N/A N/A 118 Cut Cut Lot N/A N/A N/A Project No. 05871-12-01 November 14, 1997 Uate oi Reading Days mevacion (feet MSL) (Inches) 8-Apr-97 0 0 2-May-97 24 109.14 -1.32 14-May-97 36 109.14 -1.32 20-May-97 42 109.14 -1.32 27-May-97 49 109.15 -1.20 2-Jun-97 55 109.16 -1.08 9-Jun-97 62 109.10 -1.80 17-Jun-97 70 109.08 -2.04 2-Jul-97 85 109.09 -1.92 9-Jul-97 92 109.09 -1.92 16-Jul-97 99 109.09 -1.92 UNIT 1 - MONUMENT 7 -0.5 100 GEOCON INCORPORATED o GEOTECHNICAL CONSULTANTS 6960 FLANDERS DRIVE • SAN DiEGO, CAUFORNIA 92121-2974 PHONE 619 5.58-6900 - FAX 619 5.58-6159 PT/JS DSK / EOOOO SETTLEMENT DATA ARROYO LA COSTA UNIT 1 CARLSBAD, CALIFORNIA DATE 11-14-1997 PROJECT NO. 05871 - 12 - 01 FIG SETQATA