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HomeMy WebLinkAboutParcel Map 18022 Parcel 4 Soils Report (Liefer) Ear h . echnlcs PREUMINARY SEWAGE DISPOSAL INVESTIGATION 5.0+ 1- Acres, APN 957-()9().()23 Parcel 4, P.M. 18022 NEC Nicolas & Uefer Roads, Temecula Riverside County, California Project No. 22586-02 December 23, 2002 FIRST PLAN CHECK PREPARED FOR: RECEIVED JAN 0 6 2003 CITY OF TEMECULA ENGINEERING DEPARTMENT Lorin Phipps 28745 Old Town Front Street, Suite D Temecula, California 92590 Earth Technics P.O. Box 891989, Temecula, California 92589 (909) 699-5451 FAX (909) 767-1193 \ December 23, 2002 Project No. 22586-02 Lorin Phipps 28745 Old Town Front Temecula, California street, suite D 92590 SUBJECT: ON-SITE SEWAGE DISPOSAL INVESTIGATION Single-Family Development, 5.0+/- Acres, A.P.N. 957-090-023 Parcel 4, P.M. 18022 NEC Nicolas , Liefer Roads Temecula, Riverside County, California INTRODUCTION In accordance with your authorization, we have performed a sewage disposal study on the subject improved lot to evaluate the feasibility of an on-site sewage disposal system utilizing the septic tank/leach line method. The scope of our work included: (1) site reconnaissance by our geologist; (2) excavation of 1 deep exploratory trench in the vicinity of the proposed system (the trench was logged by our geologist and this log appears in Appendix A); 4 shallow leach line percolation tests; and (4) preparation of this report presenting our findings, conclusions and recommendations for a system design for the proposed 3- bedroom house Our investigation and this report have been prepared in compliance with the format set forth by the County of Riverside, Department of Health, Division of Environmental Health. A discussion of the testing procedures are discussed further in this report. The 100-scale assessor parcel map was used to guide the location of our testing and plot our geotechnical data. At the time of our testing, several property corners had been surveyed, and the site is partially perimeter fenced. Our geotechnical data is shown on Plate 1. ACCOMPANYING MAPS. ILLUSTRATIONS AND APPENDICES Location Map (2000-scale) - Page 2 Plot Plan (40-scale) - Plate 1 Typical Leach Line Detail - Plate 2 Appendix A - Geotechnical Trench Logs Appendix B - Percolation Test Data Appendix C - Laboratory Test Results ~ INDEX MAP o 2000 4000 N SCALE INDEX MAP feet OF 5.0 +/- ACRES, APN 957-090-023 PARCEL 4, P.M. 18022 NEC NICOLAS & LIEFER ROADS TEMECULA, CALIFORNIA SOURCE: '3 U.S.G.S. 7~ MIN QUAD. BACHELOR MTN. 1953 (PR 1973) 22586-02 Page 3 SITE DESCRIPTION The 5.0+/- acre roughly rectangular-shaped lot is located at the northeast corner of Nicolas and Liefer Roads, improved paved roads in the Temecula area of Riverside County. The lot is bounded by Nicolas Road to the south, Liefer Road to the west, an existing house to the east, and vacant land in all remaining directions. The proposed cul-de-sac Indian Summer Road is proposed along the northern property line. The site has been disced for weed control and is weed free. Several building pads have been constructed of cut and fill on the north as shown on Plate 1. The entire southern 1/2 of the property is included within the flood plain for the Santa Gertrudis Creek which crosses the southern portion of the property. The geographic relationship of the property to the surrounding area is shown on the Index Map. PROPOSED DEVELOPMENT The 5.0+/- acre lot will be developed with a 3-bedroom manufactured home and attached garage at the location shown on Plate 1 adjacent to the nearly flat along Liefer Road. The approximate driveway access will be provided from Liefer Road as shown on Plate 1. Minor grading with cuts and fills on the order of 2 feet to flatten the pad and improve driveway access is anticipated. On- site sewage disposal utilizing the leach chamber/septic tank method is proposed on the cut portions of the existing larger cut and fill pad to the southeast of the building location. Water will be provided utilizing pressurized pipeline. FIELD EXPLORATION Shallow subsurface exploration of the site was performed on December 12, 2002. A case 580 Super L backhoe with a 24-inch bucket was used to dig the shallow percolation test holes and deep exploratory trench. The deep trench was logged and sampled for soils information, and this log appears in Appendix A. ~ 22586-02 Page 4 SUMMARY OF TEST PROCEDURES The 13-inch deep leach line test holes were excavated utilizing a post-hole digger in the bottom of the backhoe trenches. The test holes were presoaked utilizing the continuous presoak method adopted June 1988, which is as follows: A completely filled 5 gallon was inverted over the test hole so that a continuous level of water was maintained up to a height of 8 inches above the bottom of the hole. When the 5 gallons of water has completely percolated within the test holes, the empty bottles are removed and the holes are refilled to 8 inches above the bottom of the hole. All 5 gallons of water must infiltrate, or the holes must be presoaked a minimum of 15 hours if less the 5 gallons infiltrates. Four or more consecutive measurements are taken at time intervals that provided not less than 1 inch or more than 3 inches of drop. All measurements were taken to the nearest 1/8 inch and the difference between the last two measurements did not vary by more than 20 percent. Percolation testing was performed on December 12th and 13th, 2002. The testing procedure was performed in accordance with Riverside County Health Department guidelines. The shallow leach lines were tested in accordance with the "continuous Presoak" method. SUMMARY OF FINDINGS The area of the proposed sewage disposal location has been graded with cuts and fills to 16 and 12 feet, respectfully, to create a flat pad. The cut portions of the pad proposed for disposal are underlain by the interbedded sedimentary bedrock of the pauba Formation. The weakly cemented bedrock consists of silty sandstone (50%), clean and clayey sandstone with 2-5 percent rounded cobbles and pebbles to 2 inches in diameter. Portions of the sandstone (10%) are clean and non-cohesive. No refusal was encountered to a depth of 15.3 feet. The leach line percolation rates were variable from fast to moderately fast between 3.03 and 18.47 minutes/inch. GROUND WATER Ground water was not encountered during our investigation to a depth of 15.3 feet. The depth to historical ground water elevations are at least 55 feet below the ground surface based on down hill private wells to the north and south bracketing the property (DWR, 1971). The nearest private well to the southwest has ground water at 78 feet currently. ~ 22586-02 Page 5 FLOODING According to the Riverside County Seismic and Public Safety Element, and the Federal Emergency Management agency, the southern 1/2 of the site does lie within the boundaries of a 100 year flood plain for Santa Gertrudis Creek. The disposal area is located on a graded pad that is over 80 feet horizontally, and 12 feet vertically above the flood plain designated on Plate 1. No flooding potential exists in the area of disposal. PERCOLATION TESTS - LEACH LINES A total of 4 shallow percolation tests were performed in areas of the lot as shown on Plate 1. A summary of test results is presented -in Table 1 below, and the field testing sheets are included as Appendix B. TEST NO. P-l P-2 P-3 P-4 TABLE 1 - SUMMARY OF TEST RESULTS - LEACH LINES EARTH MATERIAL TESTED DEPTH OF TEST (INCHESl APPLICATION RATE (SQ. FT. PER 100 GALLONSl RATE (MIN/INCHl Bedrock-Pauba Fm silty fine sandstone with minor gravel 9.60 25 47-55 Bedrock-Pauba Fm sl. 40-48 silty sandstone soft portions clean + gravel 3.03 20 Bedrock-Pauba Fm 51-59 silty sand w/fine gravel + sandy silt 18.47 45 Bedrock-Pauba Fm 44-52 silty sandstone sl. silty sandstone fine - medium + gravel 9.13 25 LABORATORY TESTING Grain size analyses were performed on a representative samples of the on-site material at 10-12 feet from the ground surface. The results indicate that the percent fines (smaller than 0.074mm; passing No. 200 U.S. Standard sieve) is 36.2 percent. CONCLUSIONS AND RECOMMENDATIONS Conclusions: 1. Based upon the results of this investigation, on-site sewage disposal utilizing septic tank/leach line method of disposal is geotechnically feasible on the lot. G, 22586-02 Page 6 2. Based on the findings of this investigation, it is judgement of this engineer, that sufficient area exists in the area of the parcels tested on the property to allow installation of an adequate on-site disposal system and a 100 percent expansion area, based on typical 3-bedroom development. 3. The information accumulated during this investigation indicates that ground water, perched or otherwise, is more than 5 feet below the bottom of the recommended systems and will not encroach within the allowable separation distance of 5 feet below the leach lines. Historic high ground water is anticipated at 50 feet below the disposal area. 4. Sufficient fines (36.2%) exist in near surface soils to provide adequate filtration and to protect ground water. Recommendations: 1. We tested leach lines to rate of 3.03 - 18.47 minutes/inch. utilizing the slowest rate tested of 18.47 minutes/inch is a design rate of 45 square feet/100 gallons of septic tank capacity. 2. Assuming a 3-bedroom house, the minimum septic tank capacity is 1000 gallons. 3. Using a 1000 gallon septic tank and an application rate of 45 square feet is 450 square feet of absorption area required to effectively handle the anticipated effluent. 4. utilizing leaching chambers is 120 linear feet of 3-foot wide leaching chamber. Conventional leach lines with 1 foot of rock would require a total of 150 linear feet of 3-foot wide leach line. 5. There is sufficient area on the lot to properly dispose of on-site effluent, provided sufficient area is set aside on the lot to discharge effluent to the proposed field by gravity flow, unless otherwise approved. 6. Ground water is not expected to encroach within the allowable safety limits set forth by the County of Riverside and is more than 45 feet below the bottom of any disposal system. 7. The system should be installed in accordance with current UPC codes. A typical design is shown on Plates 1 and 2 with the required separations. 1 22586-02 Page 7 Respectfully Submitted, Larry J. Fast, RC Registration Expir services ~ REFERENCES county of Riverside Department of Health, 1981, "Waste Disposal for Individual Homes, Commercial and Industrial Booklet". DWR, 1971, Water Wells and Springs in the Western Part of the Upper Santa Margarita River Watershed, Riverside and San Diego Counties, California, Bull. No. 91-20, 378 pages \ .......- ./ -~ - y - /' .---......... ........ :?(\y' I !~-~ i~ ~ ~ 0- Co ... ~7-r i /7(ll /\ ,,~\\.~ /{(i' V)~ ./ /\ / ~ I / .,,~ " / ~\ ~ / "; "- \ \ \ \ \ I I ) I ,\ !1\' "' .,. / /,t r,! .r I~ I- I ,/ =*/ . /- ./ ~~ / / , , " // ./ /./- , / ;;. 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Co .. loll. 2:lf'" !'C _'fC ................. .0 . a:. .0.0.0.0- r-;: S;::6', go :.e;: . g" _ 0_ Z Z EZ 0 2 -- < . n & II ;: ,..c 6 .. ~i : ~ I!~ z ~ ~1-~~"''''!-:'':''C II: o ::t 00.....0...0 ze) . 0 oo..Mo..._i .. Z -III Z ;: :;:11 = Z :s 21 .. ...,. ~ ~ -. ill () ... _ 0 o. ~ S ~~ o ~ i; go..... z 0 ..- :f ill =5 ,. < -:a .. n "E . . q~. 0_ .~, ......... 0000 a " r ,. ... '" ro m :I> :u -i :r: -i m o :r: z o Ul APPENDIX A \z- . Project Number Project Name Equipment * ! ~ - J! ~ ~ .... " .c 0 -a " 15. ~ ~ 0 <IJ 0- 1- U sc.-l DS_ L K GEOTECHNICAL TRENCH LOG 22586-01/02 Date 12/12/02 Phipps Elevation 1188 +/- Trench No, T-l Case 580 Super L Backhoe ~ - B t) ii Geotechnical Description. '" - '~ OJ ~ B .f' .5 Logged by: W,Sherling U S0 1;j ~ " ~"l ~ B -u ::E ~ u ' ~ 8 ,- ~ _<IJ Sampled by: W,Sherling o~ ~~ ::E~ i'l 9:1-...______ . SC-2 S04 5- 6- 7- 8- 9- lO- ll- 12- 13- 14- 15- 16- 17- 18- 19- SM 115..0 (92,1 4.3 117.3 (93,9 5.1 SOIUCOLLUVIUM - Light yellowish brown 10 YR 6/4 silty fine medium sand with minor fine gravel. Soft, dry, porous, Sandy silt at lower contact, Gradual lower contact, BEDROCK- PAUBA FORMATION - Verypale brown 10YR 7/3-8/2 interbedded sandy siltstone (20%) and silty sand stone with minor fme gravel. Thick beds of sl. silty to nearly clean uniform medium sand stone with gravel (25% overall). Dense to very dense, sl. damp, Occ. thin interbeds 1-4" thick of clayey sand at 8'+. T,D. lOA Feet No WaterlMottling \'? Project Number Project Name Equipment j ~ f; o 0- 1- 2- 3- 4- 5- 6- 7- 8- 9- lO- ll- GS * ~ .... o ! GEOTECHNICAL TRENCH LOG ,22586-01/02 Phipps Case 580 f; o " 1 '" E ,f' ~ ii o i:' o 12- 13- 14- 15- 16- 17- 18- 19- B U L K Date 12/12/02 Elevation 1175 +/- Super L Backhoe Trench No. T-2 5 6 Geotechnical Description' ~ '~ OJ U S0 .~ Logged by: W,Sherling " 1a"l ::E a -u u ' ~ ~ - '" Sampled by: W,Sherling ,~ ~ ~~ '6 ;:i "'~ Ul SMlSC BEDROCK-PAUBAFORMATION- Yellow JOYR 7/6-7/4 interbedded silty sand (70%) and sandy silt. Weakly cemented sandstone with minor fine gravel to 114", Portions of clean sandstone are non-cohesive caving, Moderately dense to dense, sl. damp, Occ, thin interbeds at 7'+ of clayey sand, T,D, 15,3 Feet Water/Mottlin \A.. APPENDIX B \~ -- TEST HOLE NO,: 1'-1 DATE EXCAVATED' I'Z-/O./".... SOIL DESCRIPTION: &'..n,LoG/'- A..I.2. h..-.Jii{. DEPTH (Inches); 47- 55 ~ .Ii!~/(,,,h,N."MIM aJ1>VjA- TESTED BY: 1-1 'bho II;" 'T PERIOD (/ PRESOAK Time/Date 11me Interval of Presoak Water Leftl Comments: 5T.\I1T_ I: 4D I'M 12/17/u'1-- "').7-/'14 Ilm'/J fh.. 1/1.< ql IwU .t.nr'4- t STOP _ /1;[, ffM h/t;'!oy TEST PERIOD INTlAL WATER FlI\IAl WATER WATER LEVEL DAOP PERCOlATION RATE ~ CHANGE fROM LAST TIME TIME INTERVAL IMlN) LEVEL (INCHES) LEVel clNCHESI (INCHESl 1~!NCHI PERCOlATION AATE ~~ 15/.' 7/" '. 1 ' l/:-r;, "'- 7fJt/'._/?- /Jc<:.... 7, z- z-- P II; S''i 06 II:S'loO 15M<. 2.2,-,-<-- 'i)" 7 .. I" fj,37 /2- 06'Z-- 11-/ &, 12.-0$3(, EM''- C.1/4<c.. -z, /." 7//1," I" '2- 8 '7 (,. 12' 17~ '2' IS 00 )' ----- -- ----, 9m-~~;',6 -:lee Sk" 7/. .. ,.- 9 (p 7 12 .Z7'5~ ~ ~ TEST HOLE NO,: 1- 7 DATE EXCAVATED: 17-/n/07- SOIL DESCRIPTIDN'; !.€.(}I2<QL- fau)... hn-,/ DEPTH lInches): ,,/-()-C; i? \',)~ Si:i NirhN. Sol f ,PNri,.IJ;"" 1'1, A.... -t-9 rlSvd TESTED BY: il,<:' _ i !'-, ~ .. PRESOAK PERIOD 0 ' Time/Date Iv/rl- /0 J.... TIme Interval of Presoak Water Leftl Comments: STAAT_ 2:0<; PM '2/IVkJ 57 rYJ./ ~ ,11., -f/-!; l' Pi.W Ph"") _ d ,~ STOP - IZ;Ol...fJM !?-/tJ jD'J.- ' , '/ TEST PERIOD NTlAl WATER FINAL WATER WATER LEVEl DROP PERCOLATION RATE "4 CHANGE F'ROM LAST "ME TIME INTERVAL IMlN) LEVEL (INCHES) LEVEL lINCHES) (INCHES) (MIN/INCHI PERCOlATION RATE I C" r-t I:! & " 7" I , ,'C_ .?m-~9/.1_<' ? .1-:0 P 12. ()t/ 't... 12 ; tvl !t l"~:",,, Z2'4..-C-<, S" 7" I" 2 ,,17 13 12 07C'(, 12 0726 '/ ' /Ii 7'~c:.. (,.'1,; ( . $ '2."D c'~ ./.}tl.,-.I, /'tlc 273 10 - :!: 10 3' ------ ,) ------ ~ 7/5- c... )If: " I' '" 3H"\.kZ-1_~c.... 3 0.3 10 '2: 13 ::7 ----- --- \Cp EARTH TECHNICS W,O, NO, --- -~--- -----"- --~-- TEST H OLE NO,: P --'; DATE EXCAVATED: 12-//~/O2. SOIL, DESCRIPT!ON: ~,P60''' - jJ",,G., ~;.,; o,/-j DEPTH (I nch..l; 5/ - c;q .stl~""/ 1//1.1 f~v.tl-f """'P JI# TESTED BY: II. n '^ ti'", 1, PRESOAK PERIOD 1/ n.-nSt Oa;:e TIm. Interval of Presoak Water Left/Comment.s: 51A"1_ '2: I D 1M Iz/Z;bz- 7/ /vJ.:; s (, nw" 8.1% IM~-r/~ STOP- /2 :O/:, 1M 1'1-1/';/07- TEST PERIOD NTlAL WATER FINAL WATER WATER LEVEL DROP PERCOlATjQN RATe "'I. CHANGE FROM: LAST TIME TIME INTERV....L (MIN) lEVEL flNCtES) LEVEL IIr\lCHES) (INCHESl (MlNlINCHI PERCOlATION RATE II Ch 2.7 'P! " 7'/4 '. I' 911(1' - ~ 9, 2S- y:f HZ J~4_",c 17 '/5" 12 l{y 10 11.,;c S'O"u '" /, ' 7/~" !" v , Ii-?'~ 22. 00 tl:2S 12:2~ zo IfJ"",: 87 ~<c.. ~/..," 1 'J..', I 15.' uz. & 12 "IC: <::7 2LJ 12:4UC/ - .- - "," 7 " / , / t rJ ~';"?fJ 1l.L-c.. D ~ " J 8, ''17 1;;- , \ I' 02 ,8- \ / TEST H OLE NO,; p-" I DATE EXCAVATED; l't /1'-'/01.- SOIL DESCRI~TION': ,{}/9)/l-OO<- fJrJ!U;" r,.,., Oilf DEPTH !Inch.s): 4A -:57-- s,?...,lolw .r(1)/~ "'IM(';"/V-h"'-n-N~9j""...A TESTED BY: Ii ,<;, ,- (I.'~) , / PRESOAK PERIOD Time/Date Time Interval of Presoak Water Left! Comments: START _ rz;n fJfVI 17../0/07.-- '2-?--/v'w b~ 9n1/I/ ,; ,.{J, C'h"/7~_ if:; . " STOP - 12; 23 f/vi 12! 13/07.-- TEST PERIOD :/'.llTlAL WATER FINAL WATER WATER LEVEL DROP PERCOLATION RATE ~ CHANGE FROM LAST r..... TIME INTERVAL IMlN) LEVEL [INCHES) LEVEL (INCHES) (INCHES) IMlNflNCH) PERCOLATION RATE I ., ~ Z'J IZ ~~ ~ .. T I' 5,3 y5 r If _-;1,e c v#tr. /Z: Z15 ~IL- IZ.'2-'loS- (/JI'H- Z2.....Le; '01." "7 I.;,' I ' 12: lea, (;'-17 1'0 IZ:!'-o fi'~ 'S.. 7" I" ~ g"",,&~ i, I Z-o 12.:43 :)J 12:4lf3'1 IV .. . .. y .. .. CJ ~ S'-dL-L. sit" 7'4" 9 Jj 12.:53qZ. \... ,," '\ :\ W,O, NO, EARTH TECHNICS APPENDIX C \~ S:>!uq:>8~ qpe 3 . ~O-9j~S'lZ 'N"r 20/z 1'00 SJM:~s ~ scl.VOa ~;;!.:I:l11 ./.!60/"'9 puo VHU!6U36u!ll"'I/D:J 'i-g/l-~ V1(1:>3~:t I 113SI'VnN :.J.-. llSIHX3 SV1 0;)1 N \1 . 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