The URL can be used to link to this page

Browse Search

Home My WebLink About20120650 • PERCOLATION TEST RESULTS AND SEPTIC SYSTEM RECOMMENDATIONS FOR THE PROPOSED PLATTE VALLEY FIRE STATION TO BE LOCATED NEAR THE INTERSECTION OF U.S. HIGHWAY 34 AND COUNTY ROAD 53, WELD COUNTY, COLORADO FOR PLATTE VALLEY FIRE PROTECTION DISTRICT • CDS ENGINEERING CORPORATION LOVELAND, COLORADO PROJECT NUMBER 11-5581 OCTOBER 19, 2011 • 2012-0650 4l* s• s '�nP e6',1';-""-.- ,"x• -4- -? s oh.f' yt`"�`` F' fir' -$14 ; . ,4 'M •d S M0 ti'a -,, i,,�yr� a.''` 1f}r..^,l ��L'"t 1 i.F;,Fte? I 4)1V.i-4'4,-r.;-•,•-'4,•,...=.d.r." ...._,.• _• tYl1 G YM 4� 1 L'. S1 '� i" r ' "*� '1'�� r i"2r''a?�"sR�2,�1t�F! 'tint �t� P s�' �' s..4.40,-,,,....;',,:... ...>'� ` u�fs tiww R •-i'7'' .rag ,7 wA 1 FV '`� _''All `! '----�___ --• '•_` 't5'>&ai._..s:r.. .Su':..�t• tut October 19. 2011 Project No. 11-5581 Platte Valley Fire Protection District c/o RI.H Engineering. Inc. 541 E. Garden Drive, llnit S Windsor, CO 80550 Gentlemen, Enclosed is the report you requested of the percolation test results and septic system recommendations for the proposed Platte Valley Fire Station to be located near the northeast corner of the intersection of U.S. Highway 34 and County Road 53, Town of Kersey, Weld County, Colorado. IllThe design criteria and recommendations provided in this report are in compliance with Weld County regulations for Individual Sewage Disposal Systems. The system should function adequately if installed,operated,and maintained in accordance with the Weld County I.S.D.S.R.and the criteria provided in this report. If you should have any questions concerning the information in the report.please feel free to contact this office. Respectfully, FOR AND ON IBEIIALF OF CDS ENGINEERING CO " '\TION Q`P0Q REGiS?-�c / n` ,s5' $Er 9 t p• - �kt c•..p V: x fN.evin F. Becker, L:. 38387 Enclosures /j i TABLE OF CONTENTS Paste Letter of Transmittal Table of Contents ii Scope Site Investigation Site Location and Description Subsoils and Groundwater Conditions 1 Percolation Test Results 2 Septic System Recommendations ' • Conclusions 4 Location of Test Borings Drawing No. 1 Symbols and Soil Properties Figure No. I Log of Borings Figure No. 2 Absorption Bed Design Details Drawing Nos. 2 & 3 General Maintenance Recommendations Appendix I ii • • I SCOPE This report provides percolation test results and septic system recommendations for the proposed Platte Valley Fire Station to be located near the intersection of U.S. Highway 34 and County Road 53, Town of Kersey. Weld County, Colorado. SITE INVESTIGATION A field investigation, performed on October 12, 2011. consisted of drilling one (1) profile hole to a depth of eight(8)feet and six(6)percolation holes to an average depth of thirty(30)inches. Additional percolation test holes were excavated approximately twenty (20) feet south of the original site,to find more favorable conditions. Percolation tests were performed on October 13 and October 14.201 1. The Location of the Test Holes is shown on Drawing No. 1. A Log of Borings is shown on Figure No. 2. • SITE LOCATION AND DESCRIPTION The site is located north of Kersey, near the northeast corner of the intersection of U.S. Highway 34 and County Road 53. Weld County.Colorado. The site is generally in a plains region, and vegetation consists primarily of cut grasses and weeds. The site is relatively flat. No rock outcrops were observed at this site. Several irrigation ditches and laterals were observed on. or bordering, the property. Water was observed in the ditches and laterals at the time of our exploration. SUBSOILS AND GROUNDWATER CONDITIONS Topsoil - A thin layer of topsoil. approximatel> six (6) to twelve(12) inches.overlies the site. The topsoil should be stockpiled and used as backtill over the absorption field. Sand—Sands with moderate to high amounts of clay and silt were encountered in the upper four(4) • feet of the profile hole. Cleaner sands with gravel were encountered from beneath the upper sands to • the depths explored. The sands appear to be slightly moist to moist,medium loose to medium dense. and dark brown to brown. Groundwater levels were recorded as the borings were advanced, after completion of the drilling operations, and twenty-four (24) hours after the drilling operations. During our field explorations groundwater was not encountered in the profile hole. The groundwater table could be expected to fluctuate throughout the year depending on seasonal moisture variations. PERCOLATION TEST RESULTS A total of eight (8) percolation tests were conducted on the site. using the Standard Test Method,as described by the Weld County Health Department. Percolation test holes were presoaked on October 12 and October 13, 2011, and the tests were performed on October 13 and October 14, 2011. The percolation exploration indicated percolation rates of 40.240.48,40.4.4. 13.33.48,and 40 minutes per inch with an average percolation rate of 60 minutes per inch. Because this is a non- residential facility. an engineered septic system will be required for these conditions. Additional percolation tests conducted on the site may or ma> not warrant a more desirable site. Additional percolation tests could be conducted for an additional fee. The following information about the facility usage was provided to us by SEH, Inc. 6 administrative staff—business use= 15 GPD/person 5 fire fighters—residential use = 75 GPD/person 80 person community room—assembly use= 5 GPD/person Q (6 x 15) +(5 x 75) + (80 x 5) - 865 GM Qm, - 865GPDx 150% = 1298 CiPD Based on the conditions described above and the Weld County I.S.D.S.R.the minimum bed sizes required are presented in the following table. • • 3 Septic Tank Size(gal.) 2000 Standard Bed Area(t't`') 3735 Infiltrator Bed Area(ft2) 2241 Number of Quick 4 Infiltrator Units 244 Infiltrator sizes are based on a 40%maximum reduction for beds. The required number of Infiltrator units is calculated by dividing the required absorption area by 9.2 square feet per unit. SEPTIC SYSTEM RECOMMENDATIONS Recommended is a compartmented septic tank of the required size to be followed by a standard absorption field or Infiltrator System of at least the minimum size as mentioned in the table above. The bed should be constructed by a licensed septic system installer,in accordance with the 1.S.D.S.R. for Weld County(see Drawing Nos. 2 and 3). An effluent filter could be installed in or • after the septic tank and may provide a longer life for the system. The bed should lie a minimum of ten feet (10') from property lines, twenty feet (20') from the proposed structure. The contractor and/or owner must carefully plan the elevations of the structures it'gravity flow of the wastewater to the septic system is desired. We recommend that the top of the bed or trench be a minimum of one foot below any floor level with gravity sewer otherwise a pump system may be required. This system is to meet all rules and regulations set forth by the Weld County Health Department. The system described in this report may not be the only option available for wastewater treatment and disposal. Other options and technologies may exist which could provide similar levels of treatment and disposal. We recommend that a test pit he excavated prior to construction,and inspected by the Health Department or Engineer to verify the soil conditions at the site. Subsurface conditions described from the borings are based on limited samples and auger cuttings and may vary from visual observations of the test pits which may necessitate changes in the referenced system. The system is to be inspected by a representative of the Weld County Health Department prior to backfilling. • • 4 CONCLUSIONS All future owners are to be directed to information in Appendix I (General Maintenance Recommendations) of this report. These tests are only valid for the areas tested. Additional percolation tests and soil profile information will be required if the septic system is to be constructed in a different location than covered by this exploration. The findings and recommendations of this report have been obtained in accordance with accepted engineering practices in the field of Geotechnical Engineering. The type of septic system described in this report is only a reference to the 1.S.D.S.R.for the county health department and are not to be considered recommendation by the Engineer. There is no other warranty,either expressed or implied. fhe county health department has final acceptance over these test results and referenced system. All construction shall be in compliance with the septic system permit. i • M I • i.e." / Xlej - _ Hwy 34 / .---"---- -Hn� St o -, VIFTI I Y MAP KERSEY — `�o . _C 1 l I • • • • • • • TM-4 —5 • • ! • • TM-3 TM-5 ! .—f'��\ V \I • .1 .ATM-g 1 1 4TH-7 (-1 S: • 7--_.�v!E72 —I I 'r!I I 1 / 1( II I I- - -' � ! I L _ i / r I I I - - 'J Client: Platte Valley Fire Protection Dist. LOCATION OF TEST BORINGS Project: Platte Valley Fire Station, Engineering 0 Kersey, Weld County, Colorado CDS Corporation Approximate Scale: 1" = 100' 165 2nd St. S.W. Loveland, CO 80537 Project No. 11-5581 Tele: (970) 667-8010 Dwg. No.: 1 Symbols & Soil Properties • FIGURE_ NO. 1 Fill Gravel N/12 CALIFORNIA • a a . 7 Sand f ✓ / / Silt/ / / N/12 SPLIT SPOON // r Silty Clay ' z Clay THIN WALLED (SHELBY) A Weathered Bedrock --- Siltstone - - BAG SAMPLE =._ Claystone • Sandstone I I } PITCHER SAMPLE Limestone Lii r r Igneous & Metamorphic „�� Penetration Resistance and Strength Classifications are Based on The Standard Penetration Test + Approximate Number of Blows Relative Density Consistency Cohesion ksf** Per foot (N)* Cohesionless Soils Cohesive Soils 0-4 Very Loose Soft Less than 0.5 4-10 Loose Firm 0.5-1.0 10-30 Medium Stiff 1.0-2.0 30-50 Dense Very Stiff 2.0-4.0 50+ Very Dense Hard Greater than 4.0 * BLOWS PER FOOT - BLOWS OF 140 LB. HAMMER DROPPED 30 IN. TO DRIVE SPLIT(�r�)SPOON R DL586 CALIFORNIA-67) SAMPLER0 12" I •+ EQUIVALENT TO PP/2 AND Qu/2 C Engineering Lo16l 2ddCt S.W. �•-+�� Corporation rein: i97U) 867-6oio c) v m v , P TH—1 0 FT. o = rr' = 0 FT. m • m m r- 0 0 5 FT. 5 FT. 10 FT. 10 FT, 15 FT. 15 FT. 20 FT. 20 FT. 25 FT. 025 FT. . 30 FT. 30 FT. . 35 FT. 35 FT. Borings drilled 10/12/11 using SAND: sl. silty, with grovel, medium to dense, a 4" diameter, continuous flight tan to brown, sl. moist, with intermittent truck mounted drilling rig. lenses of soft, v. moist clayey silt —g-- = Groundwater O drilling 4— = Groundwater on 10/13/11 All soil and/or rock contacts shown on boring logs ore approximate and represent subsurface conditions of time of drilling. Boring logs and information presented on loge ore subject to discussion and limitations of this report. LOG OF BORINGS CLIENT: Platte Volley Fire Protection Dist. CDS Engineering ` PROJECT NO. 11-5581 Corporation Platte Valley Fire Station 165 2nd St. S.W. PROJECT LOCATION Kersey, Weld County, Colorado T1.1165 d, 88,80537 Fig. No.: 2 l Clean—outs required every 100' between house and septic tank NOTES (minimum of 1) PLUMBING AND PIPING / R 2000 gal. minimum septic 0 Building sewer installation shall -��tank with effluent filter meet all requirements of the / U current Uniform Plumbing Code. �- O SEPTIC TANK Required capacity 2000 gallons 1/8" to 1/4----- — Distribution Box per foot Tank to be double compartment and slope water—tight (incl. lids) and located o min. of 6' from bed. Tank to meet ISDSR requirements. O BED — ABSORPTION BED 4 inch solid 7\.- 7.1Excavation to be dug with no wheel pipeloads produced in the excavationl bottom. This to minimize smearing 4 inch m I I and compaction which could impede perforated percolation. pipe O SUPPLY LINE Supply line to be PVC SDR 35 or --Sr— equivalent laid with a minimum fall of 1/8—inch per foot (1/4—inch preferred). ii Cleanout required every 100 feet of pipe tu between house and tank. Compact backfill w to reduce settlement. 1-1/2 to 3 ft — O DISTRIBUTION BOX/MANIFOLD Distribution Box to be laid level for ,I� uniform distribution of effluent. O DISPOSAL LINES Edge of . 6' 4 Disposal lines to be minimum 3—inch Gravel Matrix • diameter perforated PVC. Disposal lines to be laid level. p GRAVEL MATRIX -Iliw` Gravel to be 2-1/2 inches to 3/4 inch meeting ASTM D-448, sizes 2,3,4 or 24 with no more than 1% passing #200 sieve. O COVER A layer of geotextile shall be placed over i i i the grovel to prevent filtration of cover 1-1/2 to 3 ft — t� soils into the gravel. Cover materials to consist of : Native Soils Vegetation cover to consist of drought I I 48 feet resistant grass such as: Tall Fescue 9 lines, 6' o.c. End caps or header ALL CONSTRUCTION TO COMPLY WITH THE SEPTIC SYSTEM PERMIT ISDS TYPICAL SEPTIC SYSTEM Client: Platte Valley Fire Protection District PLAN VIEW Project: Platte Valley Fire Station • Engineering Kersey, Weld County, Colorado CDS Corporation Approximate Scale: N.T.S. Ieb end $Darr Tele: 00) eer-6010 Project No. 11—5551 Drawing No.: 2 Divert drainage to prevent ponding • Filter Fabric X12" to 24" Backfill /-"<:7-51/. � Backfill 3' i 1.,f � Max. ,' Q 0: Q /12" Grovel II. ,. 9 / Matrix y 6 feet 6" of gravel below 1-1/2 to 3 ft the & 2" above pipe 4' Minimum Note: 4 distribution pipes shown the pipe to Limiting for schematic purposes. Actual Layer/GWT number of distribution pipes will -Suitable Soil depend on size of field. i' 48 feet J, NOTES O SITE PREPARATION O GRAVEL MATRIX The topsoil and vegetation shall be Gravel to be 2-1/2 inches to 3/4 inch removed and the surface must be plowed meeting ASTM 0-448, sizes 2,3,4 or 24 prior to placement of any new fill with no more than 1% passing #200 sieve. materials. O SITE DRAINAGE O TOPSOIL Site drainage shall preclude water runoff The topsoil should be saved for final over bed and ponding within 10 feet of cover. bed. O EXCAVATION METHODS O COVER • Wheeled traffic in bed bottom can A layer of geotextile shall be placed over compact the surface and impede the gravel to prevent filtration of cover percolation and should be avoided. soils into the gravel. Cover materials to Scarify the bed bottom 6" prior to consist of : Native Soils placement of gravel. O SURFACE VEGETATION O EXCAVATION DEPTH A drought resistant grass, such as tall The excavation shall penetrate any heavy fescue is recommended for final cover. clays which could impede the percolation. Any tall grass shall be kept short during O LIMITING LAYERS winter months. There shall be four (4) feet of clearance O SITE USAGE between bottom of matrix and either Vehicle and hoofed animal traffic to be bedrock, groundwater or any other limiting prohibited over top of bed. layers. O DISPOSAL LINES O ADDITIONAL INFORMATION Disposal lines to be minimum 3—inch See County ISDSR and Drawing 2 for diameter perforated PVC. Disposal lines additional information and to be laid level. recommendations. ALL CONSTRUCTION TO COMPLY WITH THE SEPTIC SYSTEM PERMIT ISDS TYPICAL SEPTIC SYSTEM Client: Platte Valley Fire Protection District CROSS-SECTION VEW Project: Platte Valley Fire Station S DSEngineering Kersey, Weld County, Colorado Corporation Approximate Scale: N.T.S. 165 2ud St. SS.11.ra.: a°top�°m-aolo Project No. 11—5581 Drawing No.: 3 i____ • APPENDIX I GENERAL MAINTENANCE RECOMMENDATIONS FOR INDIVIDUAL SEWAGE DISPOSAL SYSTEMS The following recommendations, if followed. should help increase the lifetime of the system: 1. Septic tanks should be pumped a minimum of once every four years. 2. Septic tanks and distribution boxes should be checked at least once a year for sludge accumulation which may clog the leach area if overflow occurs. 3. The leach area should not be used for grazing, sports activities_ traffic, or other activity which may compact the soils. 4. Schedule 80 pipe should be used if lines are to be placed under driveways. • 5. Trees should not be planted near the leach area so as to prevent roots from clogging the system. 6. If trees are to be planted nearby.they should be located so that the leach area is not shaded. 7. Overuse of strong chemicals, which may kill the bacteria in the system and inhibit decomposition of the sewage. should be avoided. 8. Positive drainage should be maintained over and around the absorption field area to prevent pooling of water. 9. Lines to the tank or leach area should have sufficient ground cover to prevent freezing. REV 07/10/96 • 3 �'"� CC Project Pia-14e AJGlietu, ,Pt ✓'i-oyt.,, r • _�� Subject: Get)11L �YS�e per Src, - 00 SEHDate. _ ,,,'9j piBy.- YA Al ((�� SEH#: //157A/ Checked by._ R.D G Date: Office: Vt°q VF i/ File p: Sheet No _(.._ ___. _. Of: Z 6 4c(b4,� 2 if 6/11 tt /5 p/r,c`,;O: S Fite,wlerr ie" -1�fr7' y Ctv 755p�/r'crsoe J+ B0 perLon e-onan-r,//r..,,r* vaar +i,. r /T�ee,kr/8c/; as S?po7�prrson. C> ^,2 f,,4,4 ciro:45 CI PI sgr1/0'1 '≥frrc ,r'ar Tar bi t�� ,,3 /r.->I-k_ IeZ 1rm./kr, /55/2`" jatlen lna;ee /5wiih hose A,r,ePe-- frele� -2,-,;4 t"rb4 once ek Iwk Q 6 persons x /5 9P�e_co., +(S x 75) *(F0 x 5 + /2+-rhehs' -1-rue/( 'wk 15y� • y, � Ds/ „ 0 ,`o/'. /,25/9pd 7 /S = /. 377-_,-(pi F • V = 30 rAz x // 8773 Pot ' 2, 3y-bV _ , ,Q ;:f aF froSei ii 1 .,.r. led Aih f).4 = Q �.4 _ x /. 3 1777 f 60.4.,,:, x / 3 = S y00 si 3. 5 3.:; -f ' perco/AMyi rhfe IA , , - :a4:,}�: r—64 Fri;{ per GDS Eflyheer, 7) /0//r/I • itt Prolecc 1)(6,4€. uQ lei fire Sihll(7id • ai e%� Sub lea Sep}-i G._-sySIlC V@5 3{'k. SEH Date. _ �Vliti II By. 'IA (!.1 _.._ SEH#.. //9:qz/ Checked by M1 v Date Office: FJe#. Sheet No. Of PPS) ovtiier viziaCa Code (/30 5 -Id:C4 Dosi>jch4 Le�- s (4iul/ 4e /s, zed to a«aHn� .1ar I Va�u v`M1 e. cf. I-4e °til b�,J� e $y5iTw, �r i4e. of /Sl�t '1'�eie e,G r� i` 2 Zf , V2/ r £15 = P,tias X 6 9 c t� � (,a ) _ S: 43 • , 270. 254( J� J/� sq n Glai2 / �0f•'I lei ��e /� J -� 0/ U5? J 01, = d'a, 1f 2c 7 %-s„) _ 4/69 39a7 Uciosiarsi ek 110-2 let/ + 4-6935,1 = 739.5 j,( ),ep+rlot\ +a,; - 75l.55A( ' (4) = °4(fie? • -yr (15') (A52 S / in. Me44 of P.f a okOSe a`dhe " ‘/4.9,35 .i I f13 ac if 7 sot o 7r (z c') • 'I I HµY 34 / ` i I x • I e + e I IIBI St S a se PTH-1 a ....0 "...r. VICIMW MM KERSEY • • • ® • • Pare loot J I l $ Holes, rya • TH—a • • I TH-3 ht-5 I I I . .I 4:N-7Th-8 I TH-2 1H-14 • LIM , I / / �1 I I----- I 1 I I I I J I I Client: Platte Valley Fire Protection Dist. LOCATION OF TEST BORINGS Project: Platte Valley Fire Station, Vk Engineering Kersey, Weld County, Colorado CD,S '.' Corporation • Approximate Scale: 1" = 100' 165 2nd St. S.W. Lovel d, CO 80537 Project No. 11-5581 Tele: (970) 667-6010 Dwg. No.: 1 _ j NOIllf1NISNOD Hna unun NOJ ION F' .__ LO L✓ Imng I j•jj i — K AYMH0IH SM • C \yap§p§\p. xr \ - I €i AX Al 1 l ehp{ 4,341 Iii i j -� 8 a ." gi-iY €i a aAi a@! Gaal a{,es PF @a@wa a c I g yp to : @� 4' lk, af8$1.' 5e'gii g=r�� t f :� &riti ��-A t,; e� ggp d i \ a°�@ F s C 91 1 @@e P ' i, L II1 6lz €A9 e. @ IA5I pi6IF4g IAltY2 S / 1 i s. L/ t4.. g)$ _z � g .. :ray 67 { %a I , '*88 A Hi sa � ' hh $ t y c. 4 8 L ® i I Ism SY 3 • r ( 1 A }} ;Ail B £ qq 4 I !P ii ,di 3 d1_. 9r d 5" i2 ' i ' g. t q ,�. ° a qe d '.38 I II fib. M ?p o IN I SF & -t aI. "5f1 y; i ril �� a li „� 3 gH I 88 .-r, r -,- - i I _� ii 11 : : 1H . 0i, g I I '5ti i � I ii I 9. ht 6 d il ii it g s to 4� NOUDIV 1SNOJ - - rasa W3lSAS wen SW MN• ' .. .,....„ o' 8 g, ! 9� 88 n tl " 8ry H o! c €!8 . . rt ui» @ gjAi 2 ec _ �R Sy 4 k" "e ----_______= v —I : $ 8₹ $s Hr` Y Y g^ s€ 4 g 5 I IY -,y iL----- --i--1 83 8 '- €'YY Aso _ _— as A I ° � ine! e G 0 �� L____, \' \ 'maw. /� iy g �� ..�t elu'F F ' I" I� 9�/IMF o• T �� I o ooawr g • \ , _ • \_, / a . _\.„,,, 3! 3 1 Oa at at. PI `v I4 gg C 8 4 ₹' 9 62 8 y"a !! d ' 8 a89 ' '?i ₹ i Ieo o e 8 $ gga • s $$ 9gc4 $iitii S " o € 5 t � €E ..o egg e a e 3 : a FI g - I rig I Gs let2 _ __ Sa i 37 nl .. 8.:s t.s ;r - ;— z T P s {f e § § Y t- -1 I {{kk 11 sg Y ;4!q „E'S � '-T YK —E SI • s „ 8 fig, ne ax% x ` i;' itII ;j Hello