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Home My WebLink AboutTract Map 3883 Lot 148 Percolation Investigation (Mar.6,2000) . � � B&FSOILS �+ C.: :0 PRELlMINARY SOILS INVESTIGATION & COMPACTION TESTING � � pERCOLATION REPORTS 37 774 RIVERTON LAI�-TEMECULA, CA 92591 ' PHONE (9('H) 653I 499 PFR OT ATTON 1NVEST7GATION L�gal Description: Lot 148 of Tract 3925; A.P.I�. 921-120-006 Site Location: Lot I48 is located on De1 Rey Road in the Meadowview subdivision of Temecula, Riverside County, Califarnia Client: William and Carolyn Dalton c/o Irene Johnson of ERA Jensen Realty 27364 Jefferson Avenue, Suite A Temecula, CA 92590 � Phone: (909) 676 Job No. PT00-105 March 6, ZOQO . , � Job No. PT00-105 March 6, 2000 � Page 1 1NTRODUCTION In accordance with the County of Riverside Department of Health, our firm has conducted a percolation study to analyze the typical native soil formations for the purpose of providing an assessment of the percolation characteristics of these earth materials so that the individual sewage disposal system could be designed. A total of four (4) percolation test holes 8 inches in diameter and ranging from 36 to 28 inches in depth were located in the leach field area. All holes were pre-soaked 24 hours prior to recording the percolation rates. The field work and leach system design were completed by geologist, Mr. Peter Buchanan. SITE TOPOGRAPHY Lot 148 slopes up gently from Del Rey Road to form a naturally elevated building pad area in the back southeast section of the property. 4nTT TYPES AND GENERAT GEOLOGY Lot 148 consists primarily of sandy deposits of inedium to fine micaceous sand and silt, which generally are loosely to moderately compact within the leach line area. The accompanying 15-foot soils profile describes those soils observed in the leach field area. (See page 2.) B&FSOILS Job No. PT00-105 March 6, 2000 Page 2 �,,_ _ 0 ft. •' 0 to 7.5 ft. - Grey-brown micaceous fine to .',', �, � medium sand with some silt. These soils -�� are loosely to moderately compact and . o , � � ; damp. 7.Sft `' �� , . . ;:�� 7.5 to 15 ft. - Crrey tan-brown coarse to :; ,b medium micaceous sand with some silt. These l 5 ft. ' d=, � soils are moderately to tightly compact. No evidence of impervious layers or high groundwater levels were encountered in the leach system area. T FACH SYSTEM DESIGN The recommended leaching area, based on the above data and utilizing the lowest rate of percolation of 18 minutes per inch, would require 40 square feet of bottom trench area per 100 gallons of ei�luent per day. Design Table for Leaching Trenches No. of Septic Square 3 ft. � Linear Bedrooms Ta.nk Feet Trenches Feet 1 or 2 750 300 2 50 x 3 3 1000 400 2 67 x 3 4 1200 480 2 80 x 3 5 or 6 1500 600 3 67 x 3 B & F SOILS ' 6 �r�o _ ,�os „t2l�'� � : .r o 0 FIELD P�ACOLA'TION TEST DATA Jnches Iacba � Rdg. Time Dropped Rd;. Time Dropped Pi� # i � 3 v a•s" Pu #Z 1 3 0 2.yac" ,, y Depch_,� 2 y o 7•ZS`' Dcpth 28 2 3 0 7- 3 30 1.T5 3 '�o Z•S � .3C • �•p a �p 7.� Design Rste: 5 �� ? p Design Rute: S 3 g ��i»� � ' 6 /�jii is�l 6 � � o •;e0 '� o �.?� 7 3 0 `. . o � � a Z.? S 8 30 /•1'.5' 8 30 �.o Minimum Arca 9 -aj0 �,7� Minimum Arca 9 � p Z.p Rryui�ed� IA 3O �,.T�' Required: 10 3d �. o � � d0 -�'f" �w�/ 1 I 3 fl /, 7� 9��' t 11 �� ?• p �r I? 3a i. f�� I2 3o i Inchts Iscba Rdo. Time Dropped Rde. T3me Dropped P;c �3 1 �p �� Pit #� I � p x•�.r' Dzpth�� ? 3 0 .y UePth�y Z '3 v 7• 3 �o xs-� 3 '� o �, ty � 3 0 2•aS' 4 3 0 �, o Drsi;Tn Ratr� � 3 ?,� Desiqn R��e� 5 -,j,� z. d � � � �' O � /� � � , /�!, 6 � p 2.�Q . � 30 ?- p � � o /• 7� 3 3 d i•T� 8 �o /• 7� `linimum .4rea 9 � �.T�- Minirnum Area 9 '; O /-T� Rcquicc � 10 ? � �,7� Require � 10 �O / 7S *�p�f ! � 1 � o �. y� � 11 3p /.7y I ~ t� 30 /,7,�' t? 3a /7 Job No. PT00-105 March 6, 2000 Page 3 T,FA H ,INE ONSTRUCTION � The recommended depth for leach lines in this area is 36 inches. The 4-inch leach lines must have a minimum of 2 inches of 3/4-inch crushed rock on top of the pipe, and 12 inches of rock below the pipe. The native soils covering the leach lines should be maintained in an uncompacted state to allow evapotranspiration to take place. These loose soils covering the leach line area should be slightly domed so that settlement, dishing and subsequent inundation do not occur. In general, the leach field area should be kept free of a.11 people, activity, vehicles and livestock traffic to insure the soils remain loose and well aerated. GENERAL CONCT USTON � Based on the data presented in the report and using the recommendations set forth, it is the judgment of this engineer that there is suf�icient area on the lot in question to support an individual sewage disposal system that will meet the current codes and standards of the Health Department. Based on the data presented in this report and the testing information aecumulated, it is the judgment of the engineer that the groundwater table will not encroach within the current allowable limit set forth by county and state requirements. Respectfully submitted -�'`� ^:- � ; �,. _ . , -: i � , c�� _ Peter H. Buchanan, Randolph F. Fleming, _ �' ' J� �� Z'�/ ' G e o l o g i c a 1 E n g i n e e r, M. S. R. C. E., 4 5 6 8 7 ' � � f r�, -�: % r �., . , / {F :,^•.,�.''_ . . r` B & F SOILS � � Job No. PT00-105 March 6, 2000 Page 3 i .F.ACH L.INE CONSTRtJCTION The recommended depth for leach lines in this area is 36 inches. The 4-inch leach lines must have a minimum of 2 inches of 3/4-inch crushed rock on top of the pipe, and 12 inches of rock below the pipe. The native soils covering the leach lines should be maintained in an uncompacted state to allow evapotranspiration to take place. These loose soils covering the leach line area should be slightly domed so that settlement, dishing and subsequent inundation do not occur.. In general, the leach field area should be kept free of all people, activity, vehicles and livestock traffic to insure the soils remain loose and well aerated. GENERAL CONCLUSION Based on the data presented in the report and using the recommendations set forth, it is the judgment of this engineer that there is sufficient area on the lot in question to support an individual sewage disposal system that will meet the current codes and standards of the Health Department. Based on the data presented in this report and the testing information accumulated, it is the judgment of the engineer that the groundwater � table will not encroach within the current allowable limit set forth by county and state rec�uirements. Respectfully submitted, ..�� :: . . , __ , . i: ' . c�L�� - Peter H. Buchanan, Randolph F. Fleming; _ �� I � Geological Engineer, M.S. R.C.E., 45687 -'��Z"3� 6z �� :; � � r I , �-. . � / ., ^>, j' . � r �.. , ,, .. B & F SOILS