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Home My WebLink About; Seacrest Estates Lot 27; Soils Report; 1967-06-14OF NORTH COUNTY INC. 423 HALE AVE. ESCONDIDO, CALIF. 92025 ESCONDIDO-746.2333 OCEANSIDE-722-2125 June 14, 1967 George S. Hancock 3420 Monroe Carlsbad, California Re: Job No. 67-36 Lot No. 27, Seacrest Estates Unit No. 1, Map No. 3906 Carlsbad, California Subject: Final Clearance Report on Compacted Filled Ground Dear Mr. Hancock: In compliance with your request, an investigation was made at the reference site to determine the degree of compaction of exsisting fill ground. We have also observed the placing and tested additional fill ground placed on the site during the period May 24 to Jure 9, 1967. A visual inspection of the exsisting fill ground was made on May 23, 1967. No indication of settlement or sliding of the in-place fill was found. Loose fiIl material was found along the face of the exsisting northerIy ii11 slope. It appears this loose fill has been pushed over the edge of the original building pad. A test pit, at the approximate location shown on the enclosed Plot Plan, was excavated in the exsisting fill ground. Field density tests were tak- en at various depths in the excavation to determine the degree of com- pat tion. The results of our tests indicate the exsisting in-place fill is satisfactor- ily compacted. Prior to placing any new fill, the area to be filled was cleared of all veg- etation, scarified, watered and recompacted to not less than 90 percent of the maximum dry density to provide a bond between the in-place soil and the fill material to be placed. Imported fill was placed in six (6) inch layers, and compacted to not less than 90 percent of the maximum density by means of a sheepsfoot roller, RECEIVED JUN 16 1967 CITY OF CARLSBAD Building Department -. The maximum depth of fill placed is approximately three (3) feet. Field density tests were taken every one(l) foot in vertical height of fill placed to insure complete control of the operations. The re- sults and locations of the field density tests are reported on the following enclosures to this report: Laboratory compaction tests were performed on samples of the ex- sisting fill material and imparted fill material. The soils were tested according to the A. S. T. M. Designation 1557-58T method which uses 25 blows of a 10 pound hammer dropping 18 inches on each of five (5) layers in a 4-inch diameter, l/30 cubic foot meld. A summary of the results of the tests are presented as follows: Soil Type Soil Description Maximum Dry Optimum Density Moisture Content lbfcu.ft. qo Dry wt. 1 2 Brown sand Brown sand (Imp.rted) 128.1 10.6 133.0 8. 0 The compacted fill soils will safely support, without detrimental set- tlement, l-foot wide continuous footings loaded to 1000 pounds per square foot when founded at the minimum required depth below the lowest adjacent ground surface and placed ten (10) feet or more in- side the top of the northerly compacted fill ground slope. If foot- ings are placed closer to the exposed slope than ten (10) feet inside the top of the northerly compacted fill ground slope, they should be deepened one (1) foot below a 1 If2 horizontal to 1 vertical line pro- jected outward and downward from a point ten (10) feet horizontally inside the top of the compacted fill ground slope. We recommend all continuous footings be reinforced with at least two (2) continuous No. 4 deformed reinforcing bars. One bar should be placed within four inches (4”) of the bottom of the footing and one within four inches (4”) of the top of the footing. This recommenda- tion is in order to minimize cracking and should not be construed as a footing design. To safeguard against erosion, exposed slopes should be planted. Additional protection devices, such as top berms and drainage swales are recommended where applicable to further minimize erosion. Respectfully, submitted, SCIIL TESTING LADORATORY OF NORTH COUNT” INC. SOILS TESTING LABORATORY OF NORTH COUNTY, INC. EBS:mm Enclosures: Plot Plan Compaction Test Results SQIL TESTING LADORATORY OF NORTH COUNTY INC. 0 .‘\ ? : \ .I .LEGEhID: 0 \ NDICATES APPEU’X. kJCb,TION OF TE5T PIT EXCA&T,OM 0 I NDICATES APPEWX. ~CATION \ ’ OF FIELD DENSITY TEST, I”:‘: EXI~-TINU [OLD) FILL SLOPE 5 NEW FILL SLOPE LOT \.?7, ‘?kACWeST fSTA--l-ES . tihiJ)T td”~\, MAP 3906 SOIL TESTIING LADOQATODY OF NORrH COUNTY INC. 67- 36 c,.. ‘,,A c; --< ‘. ,“...Y> Lot 27, Seacrest Estates June 14, 1967 Unit No. 1 Job No. 67-36 COMPACTION TEST RESULTS Date Test Retest Depth of Field Field Max. Relative NO. of Fill Moisture Dry =FY Compaction Test Feet qo Dry wt. Density Density qo lb/cu.ft. Ib/cu.ft. 5-23-67 1 5-23-67 2 5-23-67 3 5-25-67 4 5-25-67 5 5-27-67 6 5-27-67 7 5-31-67 8 5-31-67 9 5-31-67 10 6-6-67 11 6-6-67 12 6-9-67 13 6-9-67 14 m&k -4* -2* 1. 0 1.0 1. 5 1. 5 6 1.5 7 1. 5 9 1. 5 F. G. F.G. 11 F.G. 12 F.G. 9.7 115.8 128.1 90.3 8.2 120.5 128.1 94.0 6.8 122.4 128.1 95.5 8.9 120.9 133.0 90. 8 8.4 119.8 133.0 90. 0 7.5 111. 3 133.0 83.7 8.1 115.0 133.0 86.5 10.1 121.3 133.0 91.3 7.8 114. 3 133.0 86. 0 14.0 120.5 133.0 90. 6 6.4 117.2 133.0 88.2 5.8 113.8 133.0 85.6 8.0 120.0 133.0 90.3 12.0 121.3 133.0 91.4 * Indicates depth below the ground surface of exsisting fill. Test taken in test pit excavation. F.G. :: Finish Grade SOIL TESTING LABORATORY OF NORTH COUNTY INC.