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Home My WebLink AboutMS 820; Bristol Cove; Soils Report; 1990-03-09SOILS INVESTIGATION Bristol Cove Carlsbad, California HETHERINGTON ENGINEERING, INC. 420- A n,/ n > -41 HETHERINGTON ENGINEERING, INC. GEOTECHNICAL CONSULTANTS March 9, 1990 Project No. 434.1 Bristol Cove Property Owners Association c/o Lindsay Management Services 6992 El Camino Real, Suite 105 Carlsbad, CA 92009 Attention: Mr. Rob Donath Subject: SOILS INVESTIGATION Bristol Cove Carlsbad, California Dear Mr. Donath: In accordance with your request, we have performed a soils investigation at the subject site. Our investigation was performed in January 1990, and consisted of sampling of the cove bottom soils, laboratory testing, engineering analysis, and the preparation of this report. The purpose of the investigation was to evaluate the soil to be dredged from Bristol Cove €or use as fill. SITE DESCRIPTION The site consists of an approximately 1200 feet long developed cove connected to Agua Hedionda Lagoon. The cove is approximately 100 to 120 feet wide and is lined with rip-rap on both sides. A near continuous row of small boat docks exists on both sides of the cove. A storm drain system empties into the northwestern extent (terminus) of the cove and a boat ramp exists on the western shore near the entrance to Agua Hedionda Lagoon. Multi-unit residential buildings accessible from Cove Drive on the west, and Park Drive on the east surround the cove. PROPOSED DREDGING We understand that the cove was last dredged approximately 4 years ago when approximately 4 to 6 feet of bottom soil was removed. We assume the proposed dredging will be similar. We understand that the proposed dredging will be performed by suction. 5245 AVENIDA ENGINAS SUITE G CARLSBAD, CALIFORNIA 92008 (619) 931-1917 SOILS INVESTIGATION Project No. 434.1 March 9, 1990 Page 2 SAMPLING AND LABORATORY TESTING Sampling of soils was performed by vibrating a 3-inch diameter aluminum tube approximately 10 feet into the bottom soils, using a Geomarex vibrocorer. Sample cores were taken at the four locations depicted on the attached Plot Plan, Figure 1. Full recovery was accomplished at Corings 1 through 3. The recovery of Coring 4 was limited to 8-1/2 feet due to the density of the bottom soils. The cores were opened by an engineer from this office and the soils were classified according to the Unified Soil Classification System. Classifications are shown on the attached Coring Logs, Figures 2 and 3. The following laboratory tests were performed: o Particle Size Analysis (ASTM: D 422) o Organic Matter Content (D 2974) o Metals Content Screen (EPA 1320) o Organic Pesticide Content (EPA 8080) o Total Petroleum Hydrocarbon Content (EPA 418.2) The results of the laboratory tests are shown on Figures 4 through 6 and Tables I through IV. TYPICAL SOIL PROFILE The results of the sieve and hydrometer analysis indicate that the cove bottom soils are typically composed of silts, clays, fine sands and organics. The corings indicated that the upper 3 to 4-1/2 feet of the bottom soils are composed generally of a layer of very soft silty clay/clayey silt. Laboratory testing indicated that this layer has a high organic matter content. Below this very soft highly organic layer, the soils were generally composed of loose silty fine sands with interbedded layers of soft sandy and clayey silts. Laboratory tests indicate that the organic matter content of these layers was somewhat lower than the upper layer. HETHERINGTON ENGINEERING, INC. SOILS INVESTIGATION Project No. 434.1 March 9, 1990 Page 3 RESULTS OF HAZARDOUS SUBSTANCE TESTING A sample from Coring 2 and a sample from Coring 4 were screened for metals content, presence of pesticides, and petroleum hydrocarbon content. Results of these tests can be found in Tables I, 11, and 111. In general, the metals antimony, beryllium, cadmium, cobalt, copper, mercury, molybdenum, selenium, silver, thallium and vanadium were not detected in either of the samples tested. Arsenic, barium, chromium, lead, nickel and zinc were detected in one or both of the samples tested but at levels well below those levels considered to be the hazardous threshold by California State Department of Environmental Health Standards. Chlorinated pesticides and PCBs were not detected in either sample. CONCLUSIONS AND RECOMMENDATIONS 1) The levels of pesticides and metals in the samples tested were all below the hazardous threshold specified in the California State Department of Environmental Health Standards. 2) Due to the high organic matter content of the soils, dredged materials will not be suitable for use as engineered fill. Excessive reduction in volume can be expected as this soil dries and as the organic matter decays over time. LIMITATIONS The analyses, conclusions and recommendations contained in this report are based on site conditions as they existed at the time of our investigation and further assume the excavations to be representative of the subsurface conditions throughout the site. If different subsurface conditions from those encountered during our exploration are observed or appear to be present in excavations, the Geotechnical Engineer should be promptly notified for review and reconsideration of recommendations. Our investigation was performed using the degree of care and skill ordinarily exercised, under similar circumstances, by reputable Geotechnical Engineers practicing in this or similar localities. No other warranty, express or implied, is made as to the conclusions and professional advice included in this report. HETHERINGTON ENGINEERING, INC. SOILS INVESTIGATION Project No. 434.1 March 9, 1990 Page 4 This opportunity to be of service is appreciated. If you have any questions, please call. Very truly yours, CHRIS HOSXIN Staff Engineer HETHERINGTON ENGINEERING, INC. .$ c-4 APPROXIMATE LOCATION OF CORING NORTH SCALE: I”= 200’ PLOT PLAN BRISTOL COVE I PROJECT NO. 434.1 I FIGURE NO. 1 HETHERINGTON ENGINEERING GEOTECHNICAL CONSULTANTS ~ ~~ 1 DIAMETER DATE: 1/8/90 CORE NO. 1 - - - 2C.j 3: SOIL DESCRIPTION 3H Dark gray-brown organic silty clay/clayey silt, very LIH Soft - Total Penetration 10' - JH - 5M Dark gray-blue silty fine sand with organics, shell - fragments, loose n MH ) interbed bedded layers of dark gray silts and silty clays, soft I H Total Penetration 10' HETKERIKGTON ENGIKEERIMG I Bristol Cove I PROJECT NO. 434-1 I FIGURE NO. 2 I GEOTECHNICAL CONSULTANTS I DIAMETER 3" d CORE NO. 3 ri Ci 'H .... IH IH I Dark gray slightly sandy clayey silt with organics, SOIL DESCRIPTION I JH' ,!H JH) H Dark gray-brown organic silty clay/clayey silt, very soft soft Dark green-gray clayey silt with organics and shell fragments, soft H 'H "1 ,!H JH) Dark gray slightly sandy clayey silt with organics, soft Dark green-gray clayey silt with organics and shell fragments, soft 'H " )H Dark gray-brown organic silty clay/clayey silt, very soft Total Penetration lo' CORE NO. 4 Dark gray silty fine sand with organics and shell fragments, loose interbedded layers of clayey silt, soft ;N 1H 1 Total Penetration 8t' I LOG OF CORINGS Bristol Cove KETKERIKGTOK ERGIREERIKG GEOTECHNICAL CONSULTANTS 3 PROJECT NO. 434'1 IFIGURE NO. USSTANDARD SIEVE SIZES GRAVEL GRAIN SIZE (MILLIMETERS) SAND oeBLES Co.r,r Fine Coarse Mrdturn Fl"L SYMBOL 1 SILT and CLAY UNlFlEDSOlL CLASSIFICATlOh I %PASSING %PASSING I FIELD SAMPLE MOISTURE 1%1 NO. 2MJ SIEVE GRADATION TEST RESULTS HETHERINGTON ENGINEERING I Bristol Cove I PROJECT NO. 434-1 lFlGURE NO. 4 GEOTECHNICAL CONSULTANTS US STANDARD SIEVE SIZES OBBLES GRAIN SIZE (MILLIMETERS) GRAVEL SAND SILT and CLAY COW,. Fine Coarse Medium Fl"L %PASSING %PASSING UNlFlEDSOlL FIELD SAMPLE MOISTURE 1%) NO. 2W SIEVE CLASSIFICATION c-1 @ 4%-7' 27 8 SM 8 GRADATION TEST RESULTS Bristol Cove HETKERINGTOW ENGINEERING GEOTECHNICAL CONSULTANTS PROJECT NO. 434-1 IFIGURE NO. ~~ US STANDARD SIEVE SIZES I SAND GRAVEL OBBLES Co.r,r Fine Coarrr Medium Fl"L GRAIN SIZE (MILLIMETERS) SILT and CLAY %PASSING X PASSING UNlFlEDSOlL FIELD SAMPLE MOISTURE I41 NO 2WSlEVE Ilr CLASSIFICATIOP e C-3 @ 3-6' 53 23 MH/(OH) 1 GRADATION TEST RESULTS TABLE I HAZARDOUS METALS CONTENT (EPA 1320) Content (mg/L) Hazardous Coring 2 coring 4 Threshold @ 4-5' @ 2-3' (mg/L) Antimony Arsenic Barium Beryllium Cadmium Cobalt Chromium (total) Copper Lead Mercury Molybdenum Nickel Selenium Silver Thallium vanadium Zinc <O. 05 0.01 0.06 <0.01 <0.01 <0.01 0.01 <0.01 0.02 <o. 0002 <0.05 0.01 <O. 05 <o. 01 <0.05 <0.05 0.01 <0.05 <0.01 0.09 <0.01 <o. 01 <o. 01 0.01 <0.01 0.01 <o. 0002 <0.01 0.01 <O. 005 <o. 01 <0.05 <0.05 0.12 5.0 100.0 5.0 5.0 20.0 250.0 Hazardous Threshold as specified by the California State Department of Environmental Health. TABLE I1 HAZARDOUS PESTICIDES CONTENT OF ORGANIC RESIDUE (EPA 8080) Content (mg/L) Coring 2 coring 4 @ 4-5' @ 2-3' Chlorinated Pesticides <0.01 <0.01 PCB <1.0 <1.0 TABLE I11 TOTAL PETROLEUM HYDROCARBON CONTENT (EPA 418.2) Content (mg/L) Hazardous Coring 2 Coring 4 Threshold @ 4-5' @ 2-3' (mg/L) Grease/Oil 16 2.0 100.0 Hazardous Threshold as specified by the California State Department of Environmental Health. TABLE IV ORGANIC MATTER CONTENT (ASTM: D 2974) Coring 2 Coring 4 Coring 4 @ 2-3' @ 1-2' @ 3-4' Total Solids (percent of 43.2 56.8 81.3 sample by weight) Organic Solids (percent of 10.8 total solids by weight) 5.7 2.5 Samples were over dried at 105 degrees Celsius to determine Total Solids percentage. Remaining solids were flashed at 550 degrees Celsius to determine Organic Solids percentage of Total Solids. HETHERINGTON ENGINEERING, INC. G EOTECHN ICAL CONSULTANTS PIarch 13, 1990 Project No. 434.1 Bristol Cove Property Owners Association c/o Lindsay Management Services 6992 El Camino Real, Suite 105 Carlsbad, CA 92009 Attention: I4r. Rob Donath Subject: RESULTS OF MAXIMUM DRY DENSITY/ OPTIMUM MOISTURE CONTENT TEST Bristol Cove Carlsbad, California Reference: “Soils Investigation, Bristol Cove ...,‘I by Hetherington Engineering, Inc., dated March 9, 1990. Dear Mr. Donath: In accordance with your request, we have performed a maximum dry density/optimum moisture content (ASTM: D 1557A) laboratory test on a composite soil sample mixed from the four cores we sampled in Bristol Cove. The maximum density of the composite was 118.5 pounds per cubic foot and the optimum moisture content was 13.0%. This opportunity to be of service is appreciated. If you have any questions, please call. Very truly yours, HETHERINGTON ENGINEERING, INC. CHRIS HOSKIN Staff Engineer 5245 AVENIDA ENCINAS SUITE G CARLSEAD, CALIFORNIA 92008 (619) 931.1917 . -. ~ . .. ..,..?," .~ ..,, * . ., ;; i.,:.*,. .~..' ,.., ._,_ , ,.I. .., 1J. . .. .. ,, :. ,-.:b";,' .i , !_ ., .. .:*i;, . , - . . .. . .. .. .. .. .w ,. .. ,I. I :CV' r $< , . ., i* .. - , ,'.. ' --", .. .~. , .. . ... ,. .., . .(.. (.. ,.. Sl, . , . , , .,.~ , .. , ,,I (4~ .. i HETHERINGTON ENGINEERING, INC. /i - - , . .. .. . G EOTECH N ICAL CONSULTANTS j:, I I December 5, 1990 Project No. 434.2 Bristol Cove Property Owner Association c/o Lindsay Management Services 7720 El Camino Real, Suite 2-A Carlsbad, CA 92009 j:. Attention: Mr. Tom Frey Subject: NUTRIENT SCAN OF COVE BOTTOM SOILS: SAMPLING PROCEDURE AND TEST RESULTS Bristol Cove Carlsbad, California Reference: Soils Investigation, by Hetherington Engineering, Inc., March 9, 1990. , Dear Mr. Frey: In accordance with your request, we have collected five samples of the bottom soils of Bristol Cove for the purpose of,testing for nitrogen and phosphate nutrients. Included with this letter you will find: 1) A Plot Plan of the cove displaying the locations' 'from which :: ., ., each sample was obtained. , .. -.-_- _~: .-_ -:= (---:- -_.. -2 -_ n.>c--.;.. ---_-- Reccr? ri:hic!? c~fit?.inc 2 . ~ . . . . .- :=.=L--3dti.~z or' each SGL sample an2 the depth below cove bcttom --u2.r .vfiicp. cze cainpir xas Laken. -,-,-- -. 3) A copy of the test results for each of the five samples. . 4) We have also inclseed a copy of the original test results of the Metal, PCB, and Pesticide Scans which were originally reporred in cne ref*;e:-,csd repart. . ci__ -_. , . _.._-. ^^ c,.,. -..+-: 3-L c--- ..-5-2 r-11 ect-.' the e2T--;. A*,= -.LAi ai ..., >-:.a L1_ _.._ ._-_i___._I "-.. I ,___--_- -?Pi- ~. a5ternoon ill A;~veniie:. __: ,ji, uciz? 3 ;1rn2 auger. Samples >ie:-s collected frm five relatively evenly distrlbuted locations as shown on tie zcccmpanying Plot Plan. An effort 'N&S made to collect from vari~us S??ths so that the samples would 5s representative of 1. x 5245 AVENIDA ENCINAS SUITE G CARLSBAD, CALIFORNIA 92008 (619) 931-1917 .. .,i.. . ' ,.. .~ ., .. ,,. ., .. .I i' . ~.. .., .. NT SCAN OF NG'PROCEDURE AND TEST RESULTS Project No. 434.2 ~ December 5, 1990 Page 2 i. the various types of bottom soils. After extracting the hand auger t.; ? '0 i If you have any questions, or if we can be of further assistance $-,! please call. L': ii. '? -1 from the cove bottom, the samples were put into one liter polyvinyl containers and stored in a chilled ice chest. The samples were delivered to the testing laboratory 'in the ice chest later that same afternoon of November 13, 1990. t:.:, 81 sincerely, HETHERINGTON ENGINEERING, INC. CHRIS HOSKIN Staff Engineer ' ' Enclosures HETHERINGTON ENGINEERING, INC. .. . <. , i. , i . -'. . .. .. . >:., .. ., .. - 0 NOR;;.' ERISTOL COVE K ET F. E P. II GTO I: E K G I K EER r FV' e G EOT ECEh ! GAL CGNSU LTAhTS PROJECT NO. 434.1 (FIGURE NO. 1 - HETHERINGTON ENGINEERING, INC. f SOIL 8 FOUNDATION ENGINEERING I ENGINEERING GEOLOGY HYDROGEOLOGY CHAIN OF CUSTODY RECORD __ .- - . . ., I I I I I I ! Environmental Engineering Laboratory 3538 Hancock Street San Diego, CA 92110 (610) 208-6131 HETEERINGTON ENG.,INC. 5245 AVENIDA ENCINAS/STE.G CA3LSEAD , CA 92008 Customer # 242 Sample # 901112408 Reference : BC-1 bt- ,l; 1 /y /- /~d// ; ,: ,c //' -;.. le,. .q/>,. Sampled : 11/13/90 01:OOFM Received : 11/13/90 04:02€M P.O. t7 Comment : COPY: S.D.REGIONAL WQCB Test Run: Result: Nitrogen. Ammonia Nitroeen. Kjeldahl Nitrogen, Nitrite Nitrogen. Nitrate Nitrogen. Orgznic Fhc.c?hZte, Ortho T: ,. .- ,.. ,- i-, ~ - : T , + ~ , , Environmental Engineering Laboratory 3518 Hancocl: Street San Diego. CA 92110 (G13) 29C-&l?l HETHERINGTON ENG.,INC. 5245 AVENIDA ENCINAS/STE.G CARLSEAD , CA 92008 Customer U 242 Sample # 901112409 Reference : BC-2 M@&- F~C- Md/,q/ [-Rt5 gg,., Ssmpled : 11/13/90 01 : 30PM. Received : 11/13/93 04:02FM P.O. U Comment : COPY: S.D.REGIONAL WQCB Test Run: Result: Nitrogen, Ammonia Nitrogen, K.jeldah1 3.1 m&/Q 6,z 3.1 ms/Kg. Kitrogen, Ritrate 0.05 mg/Kg. Nitrogen. Nitrite 0.010 mdKg Nj trogen. Org-znic < 0.1 mg/Kg Phosphete. Ortho 0.30 m%/Ke "osphzte. Total 0.48 mg,'Kg pm - 1; Envircninental Engineering Laboratory 3538 Hancock Street San Diegc, CA 92110 (619) 298-6131 HETHERINGTON ENG..INC. 5245 AVENIDA ENCINAS/STE.G CARLSEAD , CA 92008 Customer B 242 SamDle S 901112410 Received : 11/13/90 O4:OZPM P.O. fJ Comment : COPY: S.D.REGIONAL WQCB Test Run: Nitrogen, Ammonia Nitrogen, Nitrate Nitrogen. Nitrite Kitrosen ~ Orginic E'hosphate . Ortho ?I-, -.:Vb),= t,n . T-, - : 1 Nitrogen. Kjeldshl -p? .. , Environmental Engineering Laboritory 3538 Hancock Street. San Diego. CA 92110 (6191 298-6131 HETHERINGTON ENG..INC 5245 AVENIDA ENCINAS/STE.G CARLSAD , CA 92008 Customer U 242 Sample U 901112411 Heference : BC-4 Sampled : 11/13/90 02:30PM Re.ceived : 11/13/90 04:02PM P.O. Fi Comment : COPY: S.D.REGIONAL WbCE Test Run: Nitrogen, Ammonia Nitrogen. Kjeldahl Nitrogen, Nitrate Nitrogen, Nitrite Nitrogen, Organic Phosphate. Ortho Fhosvhate. Total Result: I Y ,-i: i' , Envircnmental Engineering Laboratory 3538 Hanccck Street San Diegc. CA 92110 (619) 298-6131 HETHERINGTON ENG..INC. 5245 AVENIDA ENCINAS/STE.G CARLSBAD , CA 92006 Customer # 242 Sample # 901112412 Reference : BC-5 Sampled . : 11/13/90 03:OOFM Received : 11/13/90 04:02PM P.O. $4 Comment : COPY: S.D.REGIONAL WQCB Test Run: Nitrogen, Ammonia Nitrogen. Kjeldahl Nitrogen, Nitrate Nitrogen, Nitrite Nitrogen, Organic Phosphate, Ortho F'h~.=-5~+,e. Total Result: 4.2 mp /Kg 4.2 mg'Kg 0.05 m/Kg 0.012 mUKg < 0.1 mg/'Rg ' 0.05 me/Kg i1 '6 nr /Kr Envi ronmen ta 1 Eng ineerinq Labc t-atory 7CT Hacoch Street San Diego, CA . 92110 (619) 298-6131 HETHERINGTON ENG.,INC. 5245 AVENIDA ENCINAS/STE.G CAFiLSEAD , CA 7r'(3(:!E Comment : ATTN: CHEISTOFHEF: tlOSKIN(ASTM 27-74) (% VOLATILE IF DRY WT.%) Se.mpled : / / (.?(.!:(:!(:I -PI Received : t:lZ/(:li /90 (:!(I! .[:!(I) -PI .. - \ Environmental Engineering Laboratory 3538 Hancock Street San Diego, CA 92110 (619) 298-6131 HETHERINGTON ENG.,INC. 5245 AVENIDA ENCINAS/STE.G CARLSBAD , CA 92008 Customer # 242 Sample # 900100873 Reference : DEPTH 2-3/BORING .4 Sampled : / / 0O:OO M Received : 01/26/90 00.00-M P.O. # JOB #434.1 Comment : ATTN: CHRISTOP~~ER HOSKIN Test Run: Result: Antimony Arsenic Barium Beryllium Cadmium Cobalt Coc-;-;r Gre&&e r; 2;- Lead Mercury Mo 1 ybdenum Nickel O.R. - Chlorinated Pesticides ;.I?. - 2CZ I: eleni.;a c: 7-Thr - .IC - i 1 UT. "i I .... ~ 7__ ~ 1 .,_I_ -..., _---_ -__. -_ -.-- - . Vanadium Zinc < 0.05 < 0.01 0.09 < 0.01 < 0.01 < 0.01 2.7: < G.21 i.S c.01 < 0.0002 < 0.01 0.01 < 0.01 < 1.0 < n.005 i 0.91 3.35 < 0.05 0.12 , Environmental Engineering Laboratory 3538 Hancock Street San Diego, CA 92110 (619) 298-6131 HETHERINGTON ENG.,INC. 5245 AVENIDA ENCINAS/STE.G CARLSBAD I CA 92008 Customer # 242 Sample # 900100872 Reference : DEPTH 4-5/BORING 2 Sampled : / / 00:OO M Received : 01/26/90 00.00-M P.O. # JOB #434.1 Comment : ATTN: CHRISTOPEER HOSXIN RESULTS ARE IN mq/L FROM AN EPA : EXTRACTION @ pH5.O Test Run: Result: Antimony Arsenic Barium Beryllium Cadmium Cobalt Chrmi.~!n, Tot21 Copper Grease & Oil Lead Mercury Molybdenum Nickel O.R. - Chlorinated Pesticides C.R. - PC9 Seleniun ci 7-.,3?. Thal 1 i un Vanadium Zinc --_ 1 .._ < 0.05 0.01 0.06 < 0.01 < 0.01 < 0.01 3.01 < 0.01 10 0.02 < 0.0002 < 0.05 Q.C1 < 0.01 < 1.c i 0.35 0.01 < C.05 < 0.05 0.01