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Home My WebLink AboutTract 6369 Sump Construction Letter, azn & ASSOCIATES, i NC. GEOTECHINICAL ENGINEERING • ENVIRONMEN fAL ENGINEERING CO 2STRUCT`ON TESTING &t ISS--ECT'ON June 11, 2015 Mr. Jeff Alexander Homecrete Homes 2152 NW Reserve Park Terrace Port St. Lucie, Florida Re: Update to Sail Absorption Evaluation Proposed Drainage Basin Tentative Tract 6369 McKee Road & Hughes Lane Bakersfield, California Dear Mr. Alexander: KA Project No. 022-15061 In accordance with your request, we are providing this Update to the Soil Absorption Evaluation for proposed Drainage Basin for Tentative Tract 6363 to be located at the southwest corner of McKee Road and Hughes Lane in Bakersfield, California. A Soil Absorption Evaluation was performed by Krazan & Associates, Inc., dated January 5, 2006 (KA Project No. 022-05144). In our previous report, the recommended mitigation measures to develop a basin with appropriate drainage characteristics consisted of over -excavating the basin to a depth of 24 feet below existing grade to expose the more permeable sandy sail layer below. The over -excavated basin area was then to be backfilled to the proposed basin bottom elevation with free draining clean. sand (less than 5 percent passing the #200 sieve). The basin was subsequently constructed at the southwest corner of the site. Based on our previous report, the proposed basin bottom was to be at a depth of 16 feet below adjacent grade. A total of 2 borings were recently drilled within the existing basin bottom to an approximate depth of 20 feet (36 feet below surrounding site grade) to evaluate soil conditions and soil absorption characteristics of the subsoils. A site plan showing the approximate boring locations is attached. Descriptions of the field investigation, boring logs, and boring log legend are also attached. SOIL PROFILE AND SUBSURFACE CONDITIONS Based on our findings, the subsurface conditions encountered appear typical of those found in the geologic region of the site. in general, the upper soils encountered within the northern Va of the basin consisted of approximately 2 to 3 feet of erosional sediments from a broken waterline on the west side of With Offices Serving The Western United States 2205 Coy Avenue • Bakersfield, CA 93307 • (661) 837-9200 + Fax: (661) 837-9203 07235tM1 SogA6swptimUpdate; (Tract 6369Xdm KA Project No. 022-15061 Page No. 2 the basin. The sediment eroded down the sidewall of the basica and deposited as looseffill soils in an alluvial flan pattern. Beneath the loose/fill material and within the southern portion of the basin, the upper soils predominatel} consisted of 4`Iz to 7 feet of select Imparted Fill consisting of silty sand/sand. These soils have good absorption characteristics. Beneath the fill material, alternating lad ers of silty sand/sand, silty sand, and sand were encountered to the depths explored. These soils have relatively good absorption characteristics and comply with the intent of the sandy backfill requirements as indicated in our January 5, 2006 Soil Absorption Evaluation report. Recommendations The basin appears to have been properly over -excavated and backfilled with sand as indicated in our above -referenced Soil Absorption Evaluation report. however, since the time of the construction, significant erosion has occurred along the sidewalls of the basin associated with an irrigation line failure, as well as lack of maintenance on the basin since original construction. The bottom and sidewalls of the basin are presently covered with a sparse to moderate weed growth with several small trees. Tires are scattered throughout the basin bottom. It is recommended that all trash debris, louse fill soils, and erosion placed soils be removed from the basin sidewalls and bottom. These materials will not be suitable for reuse as fill within fire basin bottom. The bottom and sidewalls should be reconstructed as indicated in the above -referenced Soil .Absorption Evaluation report. The sidewalls of the basin are not to exceed a 2.1, horizontal to vertical maximum. slope. The recommendations and limitations provided in our January 5, 2006 report apply to this letter. If you have any questions, or if we may be of further assistance, please do not hesitate to contact our office at (661) 837-9200. SN/DRJ:ht Respectfully submitted, KRAZAN & ASSOMTES, INC. Steve Nelson Ill RGE No. Krazan & Associates, Inc. With Offices Serving The western United States 95 MI 506' Soil Abxargtkm Update ('-Mct 6369).doc APPROXLI/IATE BORING LOCATION APPROXIMATE R -VALUE LOCATION SITE Al" Scale: NTS Date: June 2015 Drainage Basin - Tentative Traci 6369 brawn by: Aprovul by: HT D7 McKee Road & Hughes Lane Project No. Figure NA. Bakersfield, California 022-15061 1 N E � ""'.� "� n GEOTECIMCAL ENGINEERING UNIFIED SOIL CLASSIFICATION SYSTEM UNIFIED SOIL CLASSIFICATION AND SYMBOL CHART Description $lows elr Et�ot COARSE-GRAINED SOIL (more than lel% sof material is larger than No. 200 sieve size.) < 5 Clean Grovels (Less then 5% fines) 5-15 s Wall -graded grads, grad -sand GW 16-40 t mixtures, little or no fires GRAVEL Very Dense More than _.� GP Poorly -grated gravels, gravel -sand of coarse yc rnixtoms, little or no fines fractions larger Gravels with fines More: than. 12% fines) there No. 4 stiff' sieve size Gid silty gravels, gravel -sand -silt mixtures 21-40 GC Ctayey gravels, gravel -sand -clay > 4 mixtures No- 4 to No. 10 Clean Sands Less than 5% fines Medium -grained Welgravelly sands, ;�ifti for fittle rEo'r€essands, y, SANDS No. 40 to No. 200 50% or neonSP L__' Poorly graded sands, gravelly sands, of coarse little or no fines fracfon smaller Sands with fines More than 12% fines) than No. 4 sieve size ;s _ Slid Silty sands, sand -silt mixtures Sc Clayey sands, saint# -clay mixtures FINE-GRAINED SOILS (50% or more of material is smaller than No. 200 sieve size.) j Inorganic silt and very fins welds, rock ML f ur, silty of clayey fine sands or clayey SILTS( silts with slight plasticity AND clays of low to me lum I CLAYSInorganic Liquild limit ,'' CL plasticity, gravelly clays, sandy clays, less than silty clays, lean clays ,CL Organic silts and organic silty days of lot plasticity Inorganic slits, m1cwanus or Cpl diatomaceous fine sandy or silty Solis, SILTS epic sl{is AND CLAYS C i Inorganic clays of high plasties fiat Liquid lirnit [ clays CH a organic Sys of medium to high or greater l plasticity; organic silts LY ryttpl�%at$°tNIC LY64V19�'72i� t� 34 PT Peat and Wer highly organic sails SOILS t,, CONSISTENCY CLASS FIC.A'l'IO Description $lows elr Et�ot Granular- Sails Very Loose < 5 Loose 5-15 Medium Dense 16-40 Dense 41-65 Very Dense > 65 � Cohesive Very Siff Foils <3 Sof[ 3-5 Firrnl 6-10 stiff' 11-20 Very Stiff 21-40 Hard > 4 GRAIN SIZE CLASSIFICATION Grain Type. ,Standard Sieve Size Grain Sime in , illimcrenv^ 13oN1ders Above 12 ind ws Above 305 Cobbics 12 to 13 inches 305 (v 76.2 Caravel 3 inches to No. 4 76.2 to 4.76 Coarse --grained 3 to Y, inches 75.2 to 19,1 Fine-grained 'r4 inches to No. 4 19.1 to 4.75 Sand No. 4 To Nes. 200 4.75 to 0.074 Coarse-grained No- 4 to No. 10 4.76 to 2.06 Medium -grained No. 10 to No. 44 2.40 to 0.042 Fine-grained No. 40 to No. 200 4.042 to 0.G74 Silt and Clay Below No, 200 Below 0.474 i PLAS'nCITY CHART 60 P FL 5ta ai �a c 30: 20 1c E 6 10 20 30 40 50 60 70 BO 90 100 � LIQUID Lithe (LL) (%) Log of Borlr;g B 1 pro ",� ct. Drainage Basin - Tentative Tract 8369 F;v-,-jaW-. Nt,: 022-15061 Cliallt: liorriecrete irionnes Nc.: A-1 LocoVan: McKee Road & Hughes Lane, Bakersfield, CA Lo2,gz_;d E -:y: Wayne Andrade Depth to Watzr> !rjjt12l* Nana [lone 'SUBSURFACE PROFILE SAMPLE Penetration Test t blows/ft Water Content (%) L cn C 01 E Desc9ption 2 ZF_ 0 20 40 60 10 20 $0 40 Ground Surface BASIN BOTTOM SEDIMENTS = 4 to 6 inches SILTY SANDISAND (SM(SP) 2- FILL, fric- to rnedium-grained: brown - light brown, moist, drills easily 15 111.0 4.8 4- 1 SILTY SAND,SAND (SMISP) Medium dense, fine-grained; light brown and light gray, damp, drills easily 104.0 8.4 181 SILTY SAND (SM) Medium dense, line -grained; light brown, damp, drills easily SAND (SP) 10- Medium dense, fine- to medlurn-gralned; light gray, damp, drills easily 27 110.5 12 4, 14- 39 115.1 3.0 a 18- 20 0611 Mothod: Solid Flight Drill Rio: CME 45C-1 Drillar: Chris Wyneken Krazan and Associates OrIll Date: 8'5-15 !45le 8';Z-&: 4% Inches Eievatlow 20 Feet sh'-�A: I of 1 Log of Boring B2 Prejoct: Drainage Basin - Tentative Tract 6369 Client: Homecroto Hornea Location: McKee Rood & Hitughes Lane, Baker-sfi-:oId, CA oDpth to lfflatzr> 'niVI-A: None Froiect No: 022-15061 1-i j,'am No.: A-2 LoUged By: WLyne Andrade A 7, t Cc mpletluri: None SUBSURFACE PROFILE j SAMPLE Penetration Test blows/ft 20 40 60 Water Content (OA) 10 20 30 40 -6 CL E >.- to Description o CL >. .2 Ground Surface 2- 4 4- 84 14- PIPE RUPTUREIEROSION SEDIMENTS = 1 foot # SILTYSANDISAND (SMISP) FILL, fine- to medium -grained-, light brown and brown, moist. drift easily 129.9 1.4 .4 41 117.9 2.2 29 ■ SILTYSANDISA No (Spor/sp) Medium dense, fine- to mediurn-gralned; brown and light brown, moist, drills easily SAND (SP) Medium dense, fine- to medium -grained; light gray, damp, drills easily 106.8 4.9 2.4 31 36 ■ 11&8 ■ Drill Mailiod: Solid Flight Vi -ill Fig: GME 45C-1 Criflan Chris Wynaken Krazan and Associates Drill Data: 6-5- r' j5 Ho!e 31,2c7: V/z 'Inches . � I @&�Jllafloi : 20 �eeztl 1 of 1