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Amberpoint BP-LR020306 (2)March 8, 2002 Transwestern Commercial Services 5001 Spring Valley Road,~ Suite 600W Dallas, Texas 75244 Attn: Mr. Jim Gaspard Re: De ' ~iness Pa~-'~ ~'~oppell, ~ exas HBC Project No. 94025078 Gentlemen: HBC Engineering (HBC) has completed its subsurface investigation for the detention pond at the Amberpoint Business Park in Coppell, TeXas. The pond has been partially constructed and is near completion. Based on the grading plan provided to HBC, cuts of about 10 to 15 feet were required along the north end of the pond and fills of up to about 10 feet along the south. The sides of the pond are designed to be 4 horizontal to 1 vertical. A total of 5 borings were drilled on February 23, 2002 along the south end of the pond to explore the subsurface conditions of the recently constructed fill slopes. Each boring was continuously sampled to a depth of about 15 feet below the top of slope as shown on the Attached Boring Location Diagram. Cohesive soils were continuously sampled using steel tubes. The samples were extruded, logged, sealed and packaged at the site for transportation to the laboratory. In the laboratory, moisture content, hand penetrometer, Atterberg Limits and dX density tests were determined on selected samples. Laboratory data is provided on the attached Logs of Boring. Based on the conditions encountered in the borings about 5 to 10 feet of fill soils were present over natural clayey sands and sandy clays. This appears to be consistent with the grading plan prepared by Halff Associates dated January 2002. The fills consisted of site soils of generally Iow plasticity sandy clays. Some higher plasticity clay layers were present at varying depths within the fills. Seepage losses within the more sandy zones will likely occur. We understand that the Pond is designed for short-term detention; thus some seepage losses in the pond are not considered cdfical. Houston D'ti'.- ~ Worth Austin T~u Cit~ ] 1555 Chy Road 8901 Carpenter l~vy, 2601 Grovel Drive 5307 Industrial Oaks Blvd. 3602 3rd Avenue North' Suite 100 Suite 100 FoflWoflb,'rx 76118 Suite 160 TenM City, Texas 77590 · Houston, TX 77043 I)idlax, 3'X 7524'/ (817)268-8600 Austin, TX 78'/35 (409)945-3503 C/13) 690-8989 (214) 630.-1010. Fax (817) 268-8602 (512) 442-1122 Fax (409) 945.5077 Fax C/13) 690-8'/87 Fax (214) 630-'/070 Fax (512) 442-1181 MI. Jim Gaspard Transwestem Commercial Services March 6, 2002 Page 2 ENG1NEERINC} Upon our reviewof the conditions encountered in the borings and our general site observations, the fill sections along the south side of the pond should perform satisfactorily. The slopes as designed are considered stable. Some shallow sloughing could occur along the side-slopes. Vegetated slopes will help to reduce the potential for sloughing. We appreciate the opportunity to provide these services. Please contact us if you have any questions or comments. Sincerely; NOT~: BORII~ LOCAllONS AR[ APPRQXIklATE Proieot No., e40'ae078 BORING LOCATION DIAGRAM DETENTION AII~B;IPOI~ W PARK COf'FEU., TEXAS 0 50 100 FEET Det) 0E/27/02 LOG OF BORING PROJECT: DETENTION POND BORING NO. B- 1 Amberpoint Business Park PROJECT NO. 94025078 Coppell, Texas DATE 2-23-02 CLIENT: Transwestern Commercial Services SURFACE ELEVATION Dallas, Texas PAGE 1 of 1 FIELD DATA LABORATORY DATA DRILLING METHOD(S): I ~ ~ ATTERBERG Continuous Sampling ~ Llbl ITS :%) GROUNDWATER INFORMATION: ~ a ~ ~ ~ ~ ~ ~ ~== ~ LLI~ PI ~ 8 ~ ~ ~ DESCRIPTION OF STRATUM -~, _ .... Orange, tan and brown sandy clay - with sand ___~ ~P 2,5 16 116 32, 17 15 ~--~--/ 2.5 19 1il _ ~ I. ~.o / __ ~ r=2.0 . gray clay from 4-5' -- ~ IP=1.5 11~ 11o 13 (FILL} r=4 13 114 10--~! ~=~+ - Light brown and tan sandy clay N - STANDARD PENET~TION TEST RESISTANCE REMARKS: T - TXDOT CONE PENET~TION RESISTANCE P - ~CKET PENETROMETER RESISTANCE R - PERCENTAGE OF ROCK CORE RECOVERY RQD - ROCK QUALITY DESIGNATION LOG OF BORING PROJECT: DETENTION POND BORING NO. B- 2 Amberpoint Business Park PROJECT NO. 94025078 Coppell, Texas DATE 2-23-02 CLIENT: Transwestern Commercial Services SURFACE ELEVATION Dallas, Texas PAGE 1 of 1 FIELD DATA LABORATORY DATA~ DRILLING METHOD(S): - GROUNDWATER INFORMATION: · ~ ~ - ~ ~ . __ ~- ~ ~ PL PI DESCRIPTION OF STRATUM ~ .B ~ ~ ~ ~ '" Gray clay ~ E~ ~ - wAh or~noe s~ndy clay ~ ~ ~ .o ~ o8 _ ~;~ mP=2~~-~.~ Orange clayey sand ~ - with clay layers - ~a ~=~.5 / ~'~ 24 lO0 ~ (FILL) sandy clay ~ Brown clayey sand 10~~r=~+ ~ ~ Orange and light brown sandy clay N - STANDARD PENETRATION TEST RESISTANCE REMARKS: T - TXDOT CONE PENETRATION RESISTANCE' P - ~CK~ PENETROMETER RESISTANCE H~ ' R - PERCENTAGE OF ROCK CORE RECOVERY RQD - ROCK QUALI~ DESI~NATION LOG OF BORING PROJECT: DETENTION POND BORING NO. B- 3 Amberpoint Business Park PROJECT NO. 94025078 Coppell, Texas DATE 2-23-02 CLIENT: Transwestern Commercial Services SURFACE ELEVATION Dallas, Texas PAGE 1 of 1 FIELD DATA LABORATORY DATA DRILLING METHOD(S): ATTERBERG ~ Continuous Sampling -- GROUNDWATER INFORMATION: '~ ~ . ~ ~ No seepage observed. Dry at completion. . ~,= = ~ LL "~ 8~- ~ ~ DESCRIPTION OF STRATUM __~', .,=~ ~ TI~ Grayclay ~v~~ - wEh orahge sandy clay I __~e~ IP=4.5+ 17 104 39 19 20 44 / --~ r=~.~+ ~1 i.=~.o ~; ~o~ -- ~1 IP-3.o 15 109 (FILL} ~ -- ~~- 1 .5 ~ - Tan and brown clayey sand I ~o N - STANDARD PEN~RATION TEST RESISTANCE REMARKS: T - TXDOT CONE PENETRATION RESISTANCE P - ~CKET ~NETROMETER RESISTANCE R - ~RCENTAGE OF ROCK CORE RECOVERY R~ - ROCK QUALI~ DE~IGNATI~N LOG OF BORING PROJECT: DETENTION POND BORING NO. B- 4 Amberpoint Business Park PROJECT NO. 94025078 CoPpell, Texas DATE 2-23-02 CLIENT: Transwestern Commercial Services SURFACE ELEVATION Dallas, Texas PAGE 1 of 1 FIELD DATA LABORATORY DATA DRILLING METHOD(S): . ~ ~ ~ ~ _~ GROUNDWATER INFORMATION: ~ _zQ ~ ~ No seepage observed. Dry at completlon. v~il~-~°ff~ ~ ~ ~ PL PI ~ ~ ~_ ~ ~o ~_. DESCRIPTION OF STRATUM ~ IP=4.0 ~ Orange, tan and brown sandy clay __~ - with sand ~__~,~.~m~ 10 110 38 __~ lP=3.0 ~8 111 {FILL) Or,nfl, ~nd brown ~ndg ~0 N - ST~DARD PENETRATION TEST RESISTANCE REMARKS: T - TXDOT CONE ~NETRATION RESISTANCE P - ~CKET ~NETROMETER RESISTANCE R - PERCENTAGE OF ROCK CORE RECOVERY RQD - ~CK QUALITY DESlqNATION LOG OF BORING PROJECT: DETENTION POND BORING NO. B- 5 Amberpoint Business Park PROJECT NO. 94025078 Coppell, Texas DATE 2-23-02 CLIENT: Transwestern Commercial Services SURFACE ELEVATION Dallas, Texas PAGE 1 of 1 FIELD DATA LABORATORY DATA DRILLING METHOD{S): ~ ~ ATTERBERGLi~ ITS~%) ~ GROUNDWATERC°min~°us Sampling -- ¢= ~ ~ ~ No seepage observed. Dry at completion. INFORMATION: z = ~ - DESCRIPTION OF ST~TUM ~ ~ ~ Orange, tan and brown sandy clay ~~ - w~h sand 2~ r=5+ 17 117 36 17 19 45 T~n, oran~, ~nd light ~r~ ,and~ elag ~.~. at 1 ~.0' ~8 2o N - STANDARD PENETRATION TEST RESISTANCE REMARKS: T - TXDOT CONE PENETRATION RESISTANCE p - ~CK~ PENETROMETER RESISTANCE R - PERCENTAGE OF ROCK CORE RECOVERY RQD - ROCK QUALI~ DESIGNATION KEY TO OIL SYMBOI.q FOR OF BORI NO. OF BLOWS, N 0-4 5-10 11 -,50 31-50 OV£R 50 RELATIVE DENSITY Very Iooae L~ole Medium Dense Yery Dense PARTICAL SIZE IDENTIFICATION BOULDERS: COBBlE. S: GRAVEL: Coer~: fine: SANDS: ' Coar~: Medium: fine: SILT5 & CLAYS: Greeter then 300 mm 75 mm to ~00 mm l g,O mm to 75 mm 4,75 mm to 19.0 mm 2.00 mm to 4.75 mm 0.425 mm to 2.00 mm 0.07.5 mm fo 0.425 mm ~ then 0.075 mm CLASSIFICATION l:ff Sa" Rrm Stiff Very Stiff Hard COMPRESSIVE STRENGTHr pst Lsel fi'tan - 500 500- 1000 1000 - 2000 2000 - 4000 4000 - 8000 Mom than - ~000 HAND PENETROM£TER, fsf <0.25 0.25 - 0.5 0.5- t.0 1.0 - 2.0 2.0 - 4.0 >4.0 UndlM'urbed Sample Split Spoon Sample/ Taxa. Hwy. Dept. Penefr~ltonTe~f Core Run Diafurbed Grab Sample Water IJVel at Time of DHIIlng final Wafer Level ~ OH-High plasflah~ FILL organic SILTS and CLAYS CH-High pla~'flct~/ ~ ML-Low ploeflelly C~YS or .hal~ C~Y$ ino~anlc ~L~ · ve~ fine S~ CL-~w pla~cl~ ~ MH-H~h pla~=l~ ~I1~ C~ Ino~anle SIL~ organl= SIL~ ~-Well gm~d and C~YS ~ SC-Cl~ley SANDS OP. PoOrly graded GW-Well graded ORAVELS GRAVELS OlU, VD.S SHALE UMESTON[