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Blackmans Bay Blowhole and Environs Geotechnical

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Blackmans Bay Blowhole and Environs Geotechnical \ K INGBOROUGH C OUNCIL B LACKMANS B AY B LOWHOLE AND ENVIRONS G EOTECHNICAL R EPORT J anuary 2020 2 KINGB OR OUGH COUNCIL: BLA CK MANS BAY B LOWHOLE & ENVIRONS G eotechn ic al Repor t 21 January 2020 Wil liam C Cromer Pty Ltd 74A Cha nnel Highway T a r o on a T asma ni a 7053 Envir onmental, en gine ering an d groundwat er geolog ists M 0 40 8 122 127 E bil l crome r@bigpo n d. com W www. will iamccro mer. com 3 KINGB OR OUGH COUNCIL: BLA CK MANS BAY B LOWHOLE & ENVIRONS G eotechn ic al Repor t 21 January 2020 Cover image View west towards th e coastal opening of the B lackm ans Bay Blowhol e (centre left), 24 December 2019 . The cliff is composed of P e rmian - age siltstone , sandstone and mudstone dipping approximately 12 0 WSW . Refer to this report as Cromer, W. C. (20 20 ). Geo technical Re port , Blackmans Bay Blowhole and Environs . Unpub l i shed re po rt for Kingborough Council by William C. Cro mer Pty . Ltd. , 21 J anuary 2020 . Important Disclaimer This document has been pre pared fo r use by t he client named above by William C Cromer Pty Ltd (WCCPL) and has b een co mpiled by u sing the firm’ s expert k nowledge, due care and pro fessional expert is e. WCCPL do es not gua ra ntee that the pu blication is without flaw of any kind or is who lly appro priate f o r every purpose for which it may be used. To the extent permitte d by law, WCCPL (i ncluding its e mployees a nd consultants) exclude s a ll liability to an y person for any c ons eq uenc es, includin g but not limited to all losses, damages, costs , expense s and an y other compensation, arising dir ectly or indirectly from using thi s document (in par t or in whole) and any i nformation or material con tained in it. Warning Printed copies of this report mu st be in colour, a n d in fu ll. N o responsibil ity is other wise taken f or its cont ents. Wil liam C Cromer Pty Ltd 74A Cha nnel Highway T a r o on a T asma ni a 7053 Envir onmental, en gine ering an d groundwat er geolog ists M 0 40 8 122 127 E bil l crome r@bigpo n d. com W www. will iamccro mer. com 4 KINGB OR OUGH COUNCIL: BLA CK MANS BAY B LOWHOLE & ENVIRONS G eotechn ic al Repor t 21 January 2020 Wil liam C Cromer Pty Ltd 74A Cha nnel Highway T a r o on a T asma ni a 7053 Envir onmental, en gine ering an d groundwat er geolog ists M 0 40 8 122 127 E bil l crome r@bigpo n d. com W www. will iamccro mer. com 5 KINGB OR OUGH COUNCIL: BLA CK MANS BAY B LOWHOLE & ENVIRONS G eotechn ic al Repor t 21 January 2020 S UMMARY I n rece nt geotechnical investigations commissioned by K ingborough Council, t hree types of geotechnical hazards are recognised at and near Blackm ans Bay Blowhole. They are rockfalls/ topples of a range of sizes, small landslides , and tree falls. T h e hazards present no unacceptable risk s to infrastructure ( the c liff top fence and Talone Road : no houses are at credible risk) , and no management is required. T h e hazards present varying (mostly low ) risks to life. In this report, the se are compared to acceptability criteria recommended by th e Australian Geomechanics Society Landslide Risk Management 200 7 c , but Kingborough Council as regulator should assess acceptability for the se risks against its own organisational criteria . If risk treatment is contemplated , re ducing th e likelihood of the hazards occurring is impra cticable. Treatment (if any) should focus on reducing consequences of the hazards , which in turn may mean regulating public access to parts of the area . Wil liam C Cromer Pty Ltd 74A Cha nnel Highway T a r o on a T asma ni a 7053 Envir onmental, en gine ering an d groundwat er geolog ists M 0 40 8 122 127 E bil l crome r@bigpo n d. com W www. will iamccro mer. com 6 KINGB OR OUGH COUNCIL: BLA CK MANS BAY B LOWHOLE & ENVIRONS G eotechn ic al Repor t 21 January 2020 1 I N TRODUCTION 1 .1 Background , sc ope an d perso nnel 1.1.1 Background In December 2019, W illiam C. C romer Pty . Ltd. (WCC) was commissioned by K i ngborough Council (KC) to conduct geotech nical investigations at the northern end of Black m ans Bay Beach, including the sea cliffs and Blackmans Bay Blowhole , a nd the land seawards of Talone Road as fa r nor th as 36 Talone Road. Council ’ s background notes , instructions and t he study area ar e in Attachment 1 . R e levant background observations are: In January 2017 a fatality occurred from a cliff - top fall near the Bl ackmans Bay Blowhole. Following a coron er ’ s re port i nto the fatality , KC acquired land adjacent to the site of the fatality, an d commissioned a Public Safety Risk Assessment by IPM Consulting Services. IPM reviewed the public safety risks, the existing ris k management , and any additional improvements to ris k management which might be appropriate. IPM note d the known activities in the area were sightseeing, general re creational use, abseiling (by tourist operators, community groups and schools) and cliff jum ping. The most significant hazard s associated with t hese activities were identified as falls from th e e dges of the cliff and blowhole, injury from rockfalls and falling t ree limbs, injuries from pedestrian - traffic interaction, and slips and trip s on uneven and unofficial paths. Collective ly, the public safe ty risk was regarded by IPM as significant. IPM made several recommendations, including : o upgraded fencing along the cliff top, o engineered and certified anchors for abseiling, o warnin g signa ge , o public educa tion , and o a “ Geo technical review of the blowhole and cl iffs in accordance with the Land slide Risk Management standard released by the Australian Geomechanics Society in 2007. ” 1.1. 2 Scope, person nel and dates WCC ’ s scope of inves tigations paraphrased from Attachment 1 was to : d escribe the relevant geologi c al conditions in the study area , identify and characterise geological / geotechnical risks , suggest ( as required ) risk management measures, and where appropriate , provide geotechnical specifications for the control measures recommended b y IPM. Wil liam C Cromer Pty Ltd 74A Cha nnel Highway T a r o on a T asma ni a 7053 Envir onmental, en gine ering an d groundwat er geolog ists M 0 40 8 122 127 E bil l crome r@bigpo n d. com W www. will iamccro mer. com 7 KINGB OR OUGH COUNCIL: BLA CK MANS BAY B LOWHOLE & ENVIRONS G eotechn ic al Repor t 21 January 2020 To address th i s scope , the following in vestigations were conducted: D e sk - top study A review was done of on - line geotechnical and geological information relati ng to th e study area and environs . Most is presented in Atta chment 2. Fiel d work Field work included : a n initial i nspection and photography on 4 D e cember 2019 off - s hore ( kayak ing ) site inspection and photography on 24 D e cember 2019 mapping, drone photogr aphy , and informal doorknocking to meet local residents on Tal one Road on 2 January 2020, dynamic cone penetromete r (DCP) profiling at 1 6 locations along the exis ting and proposed extended fenceline in the study area on 2 January 2020 , and separate on - site discussions about abseiling with Mr. P. Harris of Aardvark Ad ventures (AA) , and Mr. Luke Hamilton of the Tasmania n Climbing Instructor s Association (TCIA) on 2 Jan uary 2020. The geological and geotechn ical inspections , drone phot ography and abseiling me etings we re conducted by engineering geologist B il l Cromer . C on sulting geologist Genevieve Bremne r an d field assist ant Ric hard Mackintos h carried out the DCP profiling . 1.2 P resentation of results Most of the results of investigation are pres ented in the six Attachments a ccom panying this report . 1. 3 P revious geo technical ins pection At the request of KC, I conduct ed a brief geotechnical inspection of th e Blackmans Bay Blowhole in Apri l 1999, and in a one - page report 1 made s ome minor sugges tions in relation to fencing and stormwater control. 1 Cromer, W. C. (1999). Re: Blackmans Bay Blowh o le – geotechnical inspection . Letter/report to Mr. S. Kaczmarsk i, Prog ram Engineer, T e chnical Ser vices, Kingborough Council. Environmental & Technical Services Pty. Ltd., 4 May 1999. Wil liam C Cromer Pty Ltd 74A Cha nnel Highway T a r o on a T asma ni a 7053 Envir onmental, en gine ering an d groundwat er geolog ists M 0 40 8 122 127 E bil l crome r@bigpo n d. com W www. will iamccro mer. com 8 KINGB OR OUGH COUNCIL: BLA CK MANS BAY B LOWHOLE & ENVIRONS G eotechn ic al Repor t 21 January 2020 2 R ESULTS 2 .1 G eology 2 .
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