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Home My WebLink About; Steiner Property & Lohf Property-Harris; Steiner Property & Lohf Property; 1999-04-20PACIFIC SOILS ENGINEERING, INC. 7715 CONVOY COURT. SAN DIEGO, CALIFORNIA 92111 TELEPHONE: (619) 560-1713. FAX: (619) 560-0380 WESTERN PACIFIC HOUSING 2385 Camino Vida Roble - Suite 107 Carlsbad, CA. 92009 April 20,1999 Work Order 400596A Attention: Ms. Sondra Harris Subject: Addendum Geotechnical Study, Steiner Property, Inclusion into Adjacent Lohf Property Preliminary Geotechnical Investigation, City of Carlsbad, CA References: see Appendix Gentleperson: Presented herein is Pacific Soils Engineering, Inc.'s (PSE) addendum geotechnical study for the inclusion of the Steiner property into the preliminary geotechnical study of the Lohf property (PSE, 1998), located in the City of Carlsbad, California (Figure 1). In preparation of this addendum letter, literature review (references), aerial photographic analysis (photo nos. AXN-8M-71, -72 and -73) and site geologic reconnaissance map- ping has been accomplished, and the results are presented on the enclosed 40-scale tentative map (Plate 1). Our work indicates that geologic conditions are similar to those of the adjacent parcel and, accordingly, the descriptive geology presented in our reconnaissance report is ap- plicable to the Steiner property. Importantly, minor amounts of alluvium and undocu- mented artificial fill occur over the site, as shown on Plate 1, and these units will require removal and recompaction. It is anticipated that alluvium removals will range from two (2) to fifteen (15) feet. The existing undocumented fill will require complete removal. It is anticipated that these removals will range from two (2) to ten (10) feet deep. It is an- ticipated the alluvium and undocumented fill can be reused as compacted fill provided that all deleterious material is removed. CORPORATE HEADQUARTERS LOS ANGELES COUNTY RIVERSIDE COUNTY SOUTH ORANGE COUNTY TEL: (714) 220-0770 TEL: (310) 325-7272 or (213) 775-6771 TEL: (909) 676-8195 TEL: (714) 730-2122 FAX: (714) 220-9589 FAX: (714) 220-9589 FAX: (90S) 676-1879 FAX: (714) 730-5191 Work Order 400569A April 20,1999 Page 2 Foundation recommendations are expected to be similar to those outlined in PSE (1998). Based upon the above discussion, PSE concludes that the discussion and recommen- dations which been presented in the preliminary geotechnical study (PSE, 1998) are applicable to the Steiner property. Respectfully submitted, PACIFIC SOILS ENGINEERING, INC., FflWfYTTGlHANEY, gineering^Manager PAULD.THERIAULT, Geology Associate By:. DAVID A. MURPHY, Engineering Geologis Dist: (6) Addressee JAC/PDT/DAM/JAH:KR/AOOO Reviewed by: J&HN A HANSON, ice president PACIFIC SOILS ENGINEERING, INC. Work Order 400596 APPENDIX April 20, 1999 REFERENCES Jennings, C. W., 1994, Fault activity map of California and adjacent areas: California Division of Mines and Geology, California geologic map data series, map no. 6. Pacific Soils Engineering, Inc., 1999, Clarification and Recommendation for Sulfate Evaluation, Lohf Property, City of Carlsbad, California, DRAFT, dated April 15, 1999(W.O.400596). Pacific Soils Engineering, Inc., 1998, Preliminary Geotechnical Study, Lohf Property, City of Carlsbad, California, dated June 25,1998 (W.O.400596). Pacific Soils Engineering, Inc., 1997, Preliminary site reconnaissance for the Dove Street Project, City of Carlsbad, California, dated June 20, 1997 (W.O.400596). Tan, S. S., and Giffen, D. G., 1995, Landslide hazards in the northern part of the San Diego metropolitan area, San Diego County, California, map no. 35: California Division of Mines and Geology, open file-report 95-04, scale 1:24,000. Tan, S. S., and Kennedy, M. P., 1996, Geologic maps of the northwestern part of San Diego County, California, plate 2, geologic map of the Encinitas and Rancho Santa Fe 7.5" quadrangles, San Diego County, California Division of Mines and Geology, open file-report 96-02, scale 1:24,000. Tan, S. S., 1986, Landslide hazards in the Encinitas quadrangle, San Diego County, California: Landslide hazard identification map no. 4: California Division of Mines and Geology, open file-report 86-8LA. Wilson, K. L., 1972, Eocene and related geology of a portion of the San Luis and Encinitas quadrangles, San Diego, California: University of California, Riverside, masters thesis, 135 p., 2 plates, scale 1:24,000. PACIFIC SOILS ENGINEERING, INC. APPENDIX PACIFIC SOILS ENGINEERING, INC. ! \. ' !••• — -> • -'«waier - --V-r. i -J •r-.-'y1 _*• ''*Tank //>-^r~ SITE LOCATION MAP n SCALE:1=2000 SOURCE FIGURE 1 PACIFIC SOILS ENGINEERING, INC. 7715 CONVOY COURT SAND1EGO.CA 92111 (619)560-1713 wo: 400596A DATE: 4-20-99 GEOTECHNICAL BORING LOG SHEET 1 OF 2 PROJECT NO. 400596 DATE STARTED 5/15/98 DATE FINISHED 5/15/98 DRILLER Ledezma Drilling TYPE OF DRILL RIG 30" Bucket Auger PROJECT NAME GROUND ELEV. GW DEPTH (FT) DRIVE WT. DROP LOHF PROPERTY * BORING DESIG. LOGGED BY NORTHING EASTING B-2 FJE liLLJu. Q — - - _ - 5- - 10- - 15- 20- UJ LLl LJJ-luj IS:<HOl D B in SAMPLILj LL5 o CO 7/6" CD n -1o ^o i §1 ^ / / / <& t-Vj^S '"^'V** v V o* vfcK £%?] ' •'."'• •'.^-^H7v^^H?<•4I 8^H II ^H N-'^-^H ' '•• '^H IPla 'v^B '.••"'H "^^H •;:/B GEOTECHNICAL DESCRIPTION TOPSOIL: CLAYEY SAND, fine-grained, dark brown, very moist, soft. SANTIAGO FORMATION (Tsa): SANDSTONE, fine-grained, color?, slightly moist, hard; some clay; massive. - @ 7.0 ft. CLAYEY SANDSTONE bed, one-half inch thick, medium gray, slightly moist, hard. @ 7.0 ft. Approximate Bedding: N 35 W, 95 W. @ 7.5 ft. very hard. @ 9.5 ft. very poorly bedded. @ 10.0 ft. Approximate bedding: N 67 W, 8 SW. @ 10.5 ft. fine- to very-fine grained; some iron oxide staining. - @ 19.0 ft. 6" inch thick iron oxide stained, flat-lying. undulatory bedding. @ 20.0 ft. SILTY SANDSTONE @ 22.0 ft. grades to CLAYEY SANDSTONE, fine-grained, light gray to light yellow, moisture?, hard to very hard; massive to poorly bedded. * 0.0 - 24.0 ft. » 3,548 Ibs. @ 24.0 ft. Approximate bedding: 70 W, 4 NE. continued. LJ — , ?o 18.4 5T> LX LJJ QO 108 Z .O f 89 CC CO U HX CO I- UJO I- SAMPLETYPES: PS9B PACIFIC SOIL<5 US DRIVE (RING) SAMPLE I GROUNDWATER ilSXI CM/* MCCDIKIO IMr* [SSPT {SPLIT SPOON) SAMPLE HSU ENGINEERING, INC. [B]BULKSAMPLE [T] TUBE SAMPLE BfiSil PLATE A-2 GEOTECHNICAL BORING LOG PROJECT NO. 400596 DATE STARTED 5/15/98 DATE FINISHED 5/15/98 DRILLER Ledezrna Drilling TYPE OF DRILL RIG 30" Bucket Auger PROJECT NAME GROUND ELEV. GW DEPTH (FT) DRIVE WT. DROP LOHF PROPERTY BORING DESIG. LOGGED BY NORTHING EASTING SHEET 2 OF 2 B-2 FJE liUJu,a — >UJ LU LJJ JUJ £0_5> <HCfl D SAMPLEBLOWS/FT.8 LITHOLOGYGROUPSYMBOLSAMPLE TYPES: OS DRIVE (RING) SAMPLE GQSPT (SPLIT SPOON) SAMPLE LS BULK SAMPLE CD TUBE SAMPLE GEOTECHNICAL DESCRIPTION SANTIAGO FORMATION [Tsal: Continued. @ 26.0 ft. more clay; some iron oxide staining. %* 25.0 - 27.0 ft. = 2,577 Ibs. /_ TOTAL DEPTH 27.0 FT. NO WATER IGROUNDWATER M UJ —s*fefeOO2U 9.5 ^s| CCUJ00 110 SAI-URATION{%)48 OTHERTESTSPACIFIC SOILS ENGINEERING, INC. PLATE A-2 GEOTECHNICAL BORING LOG SHEET 1 OF 1 PROJECT NO. 400596 DATE STARTED 5/15/98 DATE FINISHED 5/15/98 DRILLER Ledezma Drilling TYPE OF DRILL RIG 30" Bucket Auger PROJECT NAME GROUND ELEV. GW DEPTH (FT) DRIVE WT. DROP LOHF PROPERTY BORING DESIG. LOGGED BY NORTHING EASTING B-4 FJE ^ LULL!Q — 5- 10- 15- LJJ 111 LU jJllI 0) D D SAMPLEBLOWS/FT.push push LITHOLOGY• i-y"'^ ^ f\ *>** .GROUPSYMBOLSM GEOTECHNICAL DESCRIPTION ARTIFICIAL FILL (af): SILTY SAND, fine-grained, medium brown, slightly moist, loose to medium dense; some clay. ALLUVIUM IQal): SILTY SAND, fine-grained, medium grav " brown, moist to very moist, loose. SANTIAGO FORMATION (Tsa): SANDSTONE. fine-grained, light gray to light yellow brown, slightly moist, hard. ^* 0.0- 15.0ft. = 3,548lbs. TOTAL DEPTH 15. OFT. NO WATER jj — 5o 8.1 9.7 -— (/} DC LU QQ 86 106 SAT-URATION(%)23 90 OTHERTESTS[D] DRIVE (RING) SAMPLE I GROUNDWATER RjS9 nMr*IMCCDIKir* IMf* C|] BULK SAMPLE CD TUBE SAMPLE IfiSil PLATE A-4