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Riverchase(3)-CS 931222 'GEO- TECHNIQUE (~,r INc. ~ -- CONSULTING SPECIALISTS IN: Environmental Assessments Environmental Engineering Soils & Foundation Engineering Construction Materials Testing Commercial & Industrial Inspection "Excellence by Experience" April 27, 1992 Republic Property Group 8440 Walnut Hill Lane 8th Floor Lock Box 3 Dallas, Texas 75231 '\ Attn: Mr. Jerry Ragsdale Re: Preliminary Subsurface Soils Investigation Riverchase Addition Tracts 1 thru 11 City of Irving Dallas County, Texas 92-600 y , 4, Dear Mr. Ragsdale: We enclose our Preliminary Subsurface Soils Investigation for the above-referenced project. The subsurface soils comprised stiff to very stiff multicolored sandy clays or clayey sands with sand and gravel intermixed (fill) overlying very stiff dark brown to dark gray jointed clays to the termination depths of the borings (20 feet). Groundwater was encountered in Borings B-1 and B-2 only, at 14 to 15 feet below ground surface. Groundwater should not influence this project. Shear strength and bearing capacity appear to increase with depth. Surface or shallow formation systems should be limited to a soil bearing value not to exceed 2000 psf. ( The test results indicate significant volume change potential in both the center-lift and edge-lift condition. However, the activity range should not preclude the use of slab-on-grade construction. Composite edge lift computed to 1.27 inches with a moisture influence of 2.5 feet. Center lift computed to 2. 23 inches with a moisture migration area of seven (7) feet inside the building perimeter. 1939 East Continental Boulevard · Southlake. Texas 76092 (817) 329-0281 · (800) 348-6308 · Fax (817) 488-1866 'GEO- TECHNIQUE ( INc. ~ - CONSULTING SPECIALISTS IN: Environmental Assessments Environmental Engineering Soils & Foundation Engineering Construction Materials Testing Commercial & Industrial Inspection "Excellence by Experience" It has been our pleasure participating in this project; and, if we can be of further service, please call on us. '\ P.E. ( .. \. 1939 East Continental Boulevard · South lake, Texas 76092 (817) 329-0281 · (800) 348-6308 · Fax (817) 488-1866 --- ---- SUMMARY OF ABSORPTION-SWELL PRESSURE TEST RESULTS STRATUM AS- AFTER SUR- THICK- SAMPLED TEST TEST CHARGE MAX. PRACT. BOR. DEPTH NESS MOIST. MOIST. MOIST. LOAD SWELL SWELL NO. FEET , SOIL FEET % % % PSF % % B-1 0-1 Tan & Brown 3.0 17.1 9.8 20.3 -0- 5.31 4.94 Sandy Clay 1-2 Tan & Brown 3.0 17.5 10.0 19.9 191 2.37 2.46 ) Sandy Clay 1-2 Tan & Brown 3.0 17.2 9.8 19.2 500 1.89 1.89 Sandy Clay 4-5 Dark Gray Clay 3.0 22.9 11.9 24.3 693 1.94 1.88 5-6 Dark Gray Clay 3.0 24.2 12.2 24.4 927 1. 02 1.11 9-10 Dark Gray 7.0 27.7 13.4 28.4 1340 0.41 0.40 Shaley Clay } ,.. Maximum Practical Composite PVR (Center Lift): 2.23 Inches Maximum Practical Composite PVR (Edge Lift 1. 27 Inches " ,- r SUMMARY OF TESTS C S C o T o P S,P PROJECT: Riverchase Tracts 1 thru 11 (Preliminary); Irving, Texas M R P N R T E F E P E I S R R B I M S C CLIENT: Republic Property Group; Dallas, Texas DATE: 04-27-92 R N S N S A C L F I 2 o L E G I U I E o 0 N 0 I A BOR. DEPTH MOIS- UNIT ATTERBURG LIMITS S T F N R N N W 0 U 0 L S TYPE OF MATERIAL NO. FEET TURE % WT. PCF LL PL PI S H G E T S T S S B-1 0-1 Very stiff Tan & Brown 16.4 121. 3 32 16 16 5229 0 5.0 68 ( ) sandy clay (Fill) 4-5 Very stiff Dark Gray 23.0 111. 0 60 25 35 7470 0 5.0 95 CH Clay (Jointed) (Fill) 9-10 stiff Dark Gray Shaley 27.9 97.6 71 28 43 2490 0 5.0 98 CH Clay 14-15 Loose Tan Sand & Gravel 18.3 109.5 1185 2/ SP (Saturated) 6 GP B-3 0-1 stiff Brown, Tan & Gray 16.6 115.8 31 14 17 2739 0 5.0 63 CL Sandy Clay (Fill) >- 4-5 stiff Brown, Tan & Gray 14.4 116.3 3490 0 5.0 CL Clay (Fill) .' 9-10 stiff Gray & Dark Gray 24.0 100.8 62 25 37 2943 0 5.0 96 CH Clay . 14-15 Very stiff Gray & Dark 25.0 99.8 6233 0 5.0 CH Gray Clay (Jointed) 19-20 Very stiff Brown & Gray 22.2 108.3 7286 0 4.0 CH Clay (Jointed) ,- SUMMARY OF TESTS C S C o T o P S P PROJECT: Riverchase Tracts 1 thru 11 (Preliminary); Irving, Texas M R P N R T E F E . P E I S R R B I M S C CLIENT: Republic Property Group; Dallas, Texas DATE: 04-27-92 R N S N S A C r.. F I 2 o L E G I U I E o 0 N 0 I A BOR. DEPTH MOIS- UNIT ATTERBURG LIMITS S T F N R N N W 0 U 0 L S TYPE OF MATERIAL NO. FEET TURE % WT. PCF LL PL PI S H G E T S T S S B-6 0-1 Firm Brown & Tan Clayey 11.7 11. 5 25 12 13 4980 0 5.0 39 : ) Sand (Fill) 4-5 Very st Brn & Tan Silty 13.0 121. 5 42 18 24 7719 0 5.0 69 CL Cl wlSand & Grvl (Fill) 9-10 Very stiff Dark Brown 18.5 103.5 5976 0 5.0 CH Clay wI Cal Nods 14-15 Very stiff Dark Gray 19.6 104.8 6211 0 5.0 CH Clay 1- . ( SANO:' ,\. ?2-~"-OO _. . _ ,,;;J ~4' :':\2,47 I '.'" '....~ r'IIZ.16 - ~...... "'- l.' 221,3Z , i~~- I .~~ I . ,.<"~ '" o~~J":,o. ,~'.1'.J ~ ~,~~ .?'/" ".... oI~ COf1'f.I..LI ..~... ...,,,' ..",- ZOO WAtelf "",e <..., ,""U,Il, oS' ..., ",... .OL ...., -.zl:ll. I YO:."'6'W;" roM I ,. '., 0'+ .. .... I ~ fI_ .:~~. -~(,\IJ~~t"; '. ,49. I ..,..... ~..:::~.,'., ~tI .OL,'"'' - ~~"!> 'oJ. r.. 0._ ""'"'","" '~~' ..~< .. ~ ....,., r ". t:! ,I " .c '/ ~ ",.r~TnllflrY my cn AUTr ,; "'.I, \" ,.. 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I ....-. , . - 1 ..... l~."'.: ............... ....,......, .-------- ~ -- ( PROJECT: Riverchase Tracts 1 thru 11 (preliminary) BORING NO.: 1 CLIENT: Republic Property Group; Dallas LOCATION: As Shown DATE: 03-17-92 TYPE: Core GROUND ELEVATION: NIA '" s S Legend: y A DEPTH M M sample: X ' Penetration: - Water: - - FEET B P 0 L Description L E of stratum :\:\:\: X \:\:\:\ X '\ .\.\.\. X . . . . Very stiff Tan & Brown Sandy clay CL \:\:\:\ X ., c: .\.\.\" X (Fill) . . . . \:\:\:\ X \ \ \ \X \ \ \ X \ \ \ \X Very stiff Dark Gray clay CH Iii n \ \ \ X (Jointed) (Fill) \ \ \ \X \ \ \ X 1,1 I IX Dark Gray Shale Seam {poss Fill} ROCK I I X ., c: 1\1\1\1 X \1\1\1\ X 1\1\1\1 X \1\1\1\ X 1\1\1\1 X 1 n n \1\1\1\ X stiff Dark Gray Shaley Clay CH 1\1\1\1 X \1\1\1\ X 1\1\1\1 X \1\1\1\ X t~ Iii 1\1\1\1 X \1\1\1' X 1)(\1\1 X 1\ I \ j\ X -- :0:0:0: X 1 s; n Io:o:o:c X :0:0:0: X to:o:o:c X :0:0:0: X Io:o:o:c X 17.5 :0:0:0: X Loose Tan Sand & Gravel SP p:o:o:c X {Saturated} GP :0:0:0: X Io:o:o:c X :0:0:0: X ?n n Io:o:o:c X Boring Terminated @ 20.0 Feet Groundwater @ 14.0 Feet .,., c: ?c: n -.. - ( PROJECT: Riverchase Tracts 1 thru 11 (Preliminary) BORING NO.: 2 CLIENT: Republic Property Group; Dallas LOCATION: As Shown DATE: 03-17-92 TYPE: Auger GROUND ELEVATION: N/A (. s S Legend: Y A DEPTH M M sample: X Penetration: - Water: -- FEET B P 0 L L E Description of stratum .\.\.\. . . . . \:\:\:\ \ .\.\.\. . . . . \:\:\:\ ~ II: .\.\.\. . . . . \:\:\:\ Tan & Gray Sandy Clay CL .\"\"\0 . . . . \:\:\:\ (Fill) .\.\-\. . . . . 5.0 \:\:\:\ -\"\.\. . . . . 1\ : \ : \ : \ \ \ \ \ \ \ \ ., II: \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ Light Gray 10 0 \ \ \ to Dark Gray Clay CH \ \ \ \ (Jointed) \ \ \ \ \ \ \ \ \ \ 12 .. \ \ \ \ \ \ ,\ .\.\.\. . . . . \:\:\:\ .\.\"\. . . . . _ _ Tan Sandy Clay CL 15 0 \ : \ : \ :\ - . \ . \ . \ . . . . . 1\ : \ : \ : \ \0\:\0\ . \ . \ . \ . . . . . 17 .. \:\0\:\ .\.\.\. Tan Sand & Gravel SP . . . . \0\:\0\ (saturated) . GP .\.\.\. . . . . \:\0\:\ ?n n . \ . \ . \ . Boring Terminated @ 20.0 Feet Groundwater @ 15.0 Feet ?? " ?c; n \. -- - PROJECT: Riverchase Tracts 1 thru 11 (Preliminary) BORING NO.: 3 CLIENT: Republic Property Group; Dallas LOCATION: As Shown DATE: 03-18-92 TYPE: Core GROUND ELEVATION: NjA (, S S Legend: y A DEPTH M M Sample: X Penetration: A Water: -- FEET B P 0 L L E Description of stratum. .\.\'\. X . . . . \:\:\n X '\ . \ . \ . \ . X . . . . \:\:\:\ X ., II: .\.\.\. X . . . . \:\:\:\ X stiff Brown, Tan & Gray Sandy Clay CL -\.\.\. X (Fill) . . . . \:\:\:\ X .\.\.\. X . . . . Ii n \:\:\:\ X .\.\.\" X . . . . \:\:\:\ X \ \ \ \X \ \ \ X ., II: \ \ \ \X \ \ \ X \ \ \ \X \ \ \ X \ \ \ \X 1n n \ \ \ X \ \ \ \X stiff to Very stiff Gray & Ok Gray Clay CH \ \ \ X (Jointed Below 10.0 Feet) \ \ \ \X \ \ \ X 1? I:; \ \ \ \X \ \ \ X \ \ \ \X \ \ \ X \ \ \ \X 1 Ii n \ \ \ X \\\ \ \X \ \ X \ \ \ x \ \ \ \X 17.5 \ \ \ X \ \ \ \X Very stiff Brown & Gray Clay CH \ \ \ X (Saturated) \ \ \ \X 1\ \\ \ X ?n n. X Boring Terminated @ 20.0 Feet No Groundwater Encountered ?? I:; ?r:; n / ( ~ - ( PROJECT: Riverchase Tracts 1 thru 11 (Preliminary) BORING NO.: 4 CLIENT: Republic Property Group; Dallas LOCATION: As Shown DATE: 03-14-92 TYPE: Auger GROUND ELEVATION: NIA , S S Legend: Y A DEPTH M M Sample: X Penetration: A Water: - - FEET B P 0 L L E Description of Stratum \0\:\0\ .\.\.\" . . . . . , \:\0\:\ Brown & Tan Sandy clay CL .\.\.\. wI Small Gravel (Fill) . . . . ? II:: \0\:\0\ ;\.,.,. . . . . \0\:\0\ .\.\.\. . . . . \:\0\:\ Dark Brown Clay 5.0 .\.\.\. CH . . . . \0\:\0\ wI Sand & Gravel (Fill) .\.\.\. . . . . \0\:\0\ .,.\.\. . . . . ., II:: \0\ \0\ \ \ \ \ \0\ \ \ \ \ Gray & Dark Gray Clay CH \0\ \0\ 1n n \ \ \ wi Gravel (Possible Fill) \ \0\ \ \ \ \ \0\ \0\ , \ \ 1., ~ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ 1 ~ n \ \ \ \ \ \ \ Dark Gray Clay CH \ \ \ wi Calcareous Nodules \ \ \ \ \ \ \ 17_" \ \ \ \ \ \ \ \ \ \ \ \ \ \ \\ \, \, \ ?n n Boring Terminated @ 20.0 Feet No Groundwater Encountered ?? II:: ?c; n - ~ PROJECT: Riverchase Tracts 1 thru 11 (Preliminary) BORING NO.: 5 CLIENT: Republic Property Group; Dallas LOCATION: As Shown ( DATE: 03-14-92 TYPE: Auger GROUND ELEVATION: N/A ( S S Legend: Y A DEPTH M M Sample: X Penetration: - Water: - - FEET B P 0 L L E Description of Stratum \0\ \0\ \ \ \ '\ \ \0\ \ \ \ \ Dark Brown Clay CH ? r; \0\ \0\ \ \ \ wI Gravel (Fill) \ \0\ \ \~\\\~\ 5.0 \ 0 \ \ 0\ \ \ \ \ \0\ \ \ \ \ \0\ \0\ ., r; \ \ \ \ \0\ \ Dark Brown & Brown clay CH \ \ \ \0\ \0\ wI Gravel (Possible Fill) \ \ \ 10 n \0\ \0\ \ \ \, \\ \~\, \/\/\1' Dark Gray Shaley Clay 12 5 /\/\{){ CH \ 1\ I \ \ \\ \ \ \ \ \ \, 1.. n \ \ \ \ \ \, \ \ \ Dark Gray Clay CH \ \ \ \ \ \ , wi Calcareous Nodules (Jointed) 1., ~ , , '\ \ \ \ \ \ \ \ \ \ , ?n n \\ \ \ . Boring Terminated @ 20.0 Feet No Groundwater Encountered ?? r; ?c;. n \ -' --- PROJECT: Riverchase Tracts 1 thru 11 (Preliminary) BORING NO.: 6 DATE: 03-14-92 TYPE: Core LOCATION: As Shown GROUND ELEVATION: N/A CLIENT: Republic Property Group; Dallas s S Legend: y A DEPTH M M Sample: X penetration: - Water: -- FEET B P 0 L L E Description of stratum .\.,.,. X . . . . .' ,:\:\:\ X Firm Brown & Tan Clayey Sand sc .\.,.\. X . . . . (Fill) \:\:\:\ X ? c:; . \ . \ . \ . X . . . . Io\:\:\c X \ : \ I \ :\ X Io\:\:\c X Very stiff Brown & Tan Silty Clay \:\1\:\ X CL II;, n C\:\:\C X wI Sand & Gravel (Fill) \:\1\:\ X b\:\:\c X \ \ \ \X \ \ \ X 7 1:\ \ \ \ \X \ \ \ X \ \ \ \X Very stiff Dark Brown Clay CH \ \ \ X \ wI Calcareous Nodules \ \ \ \X 1 n n , \ \ X \\\ , \X \ \ X \ \ \ X \ \ \ \X 1? II;, \ \ \ X \ \ \ \X \ \ \ X \ \ \ \X \ \ \ X 11:\ n \ \ , \X Very stiff Dark Gray Clay \ \ \ X CH \ \ \ \X \ \ \ X , \ \ 'X 17.5 \ \ \ X \ \ \ \X \ \ \ X \ \ \ \X \ \ \ X "I'l I'l \ \ X . Boring Terminated @ 20.0 Feet No Groundwater Encountered ?? Ii ')1; I'l . . .-- -- ( KEY TO SOIL SYMBOLS AND DESCRIPTIONS USED ON LOGS OF BORINGS 0 0 0 - - - \>\>\ 0 0 - - - >\>\> 0 0 0 Gravel silt .- - - Rock >\>\> Limey 0 0 - - - >\>\> . . . . . . \ \ \ / / / , =a::::a___ . . . . . ::::: \ \ / / =s:z=__ : : : : : Sand \ \ \ Clay / / / Shale ===== Organic . . . . . \ \ / / ----- . . . . . ----- COLOR In color description of soil, the predominating color is stated first. CONSISTENCY OF COHESIVE SOILS Classification Compressive strength, psf Very Soft Less than - 500 Soft 500 - 1000 f . Plastic 1000 - 2000 stiff 2000 - 4000 Very stiff 4000 .- 8000 Hard Hore than 6000 CONSISTENCY OF COHENSIONLESS SOILS Classification standard penetrationt bpi Loose Less than 10 Firm 10 30 Dense Nore than 30 SOIL STRUCTURE Jointed cut by old shrinkage planes. Fractured containing old cracks, frequently filled with s~nd, silt or clay of differing color. Interbedded - Composed of alternate layers of different soil types. Limey contains deposits of calcium carbonate. ~,