Description of the job
- Mapping activity of the pollutants in the former Eternit plant in Bagnoli, prior to the remediation intervention
- Risk assessment
- Detailed planning of remediation operations
Given the large size of the area and the different pollutants present in the site, intervention procedure were defined in single areas in a 20x20 metre scheme, thanks to an innovative computer system (Map-info) for the classification of mapping data and procedures.
This made it possible to gather specific information about each small area being treated:
- waste quantity
- waste type
- dangerousness (release index)
- risk indication
- intervention procedures
Difficulties faced
- Self-sown vegetation in the polluted area required manual deforesting work and the installation of air monitoring devices to check and prevent pollution from spreading to the surrounding areas.
Critical points
- Problems in creating safe conditions because of the state of degradation of the site.
Added value of the auditing activity
- The computer system allows a detailed real time monitoring of remediation activities and the respect of work plans and environmental parameters set.
- Amount of the audit fee: €. 154.937
Technical data
Area treated:
- 150,000 m2 (monitored area in the site)
- N° of engineering managers: 1
- N° of computer engineers: 1
- N° of topographers to survey the area:
- 6 analysts to map and categorise waste
Significant pollutant quantities detected
- 550 tons of asbestos powders
- 6.000 tons of cement-asbestos objects and scrap
- 700 tons of asbestos-polluted soil
- 50 tons of various waste having different dangerousness levels
Data
Customer: Bagnoli SpA
Area: Bagnoli (Napoli)
Construction site: ex manufacturing plant Eternit
Work Period: 4 months
Work Termination: 31/05/1999
Description of interventions carried out
According to article 9, par. 1 of the Ministerial Decree 471/99, the owners informed the competent authorities that the soil might be polluted subsequently to mineral spirit spill and about the security measures adopted. The procedures to present the Characterisation Plan started.
In the first phase, the Characterisation Plan required to collect data about the production of materials used during the production cycle. Analyses from a former research showed the presence of hydrocarbon-impregnated soil around the mineral spirit tanks.
Underground tanks reach 1 ml below the flooring level and their capacity is 5 m3. They are installed under a shelter which is divided in two parts: the first contains a floor tank where the spirit used to be used to check the products - it was then recovered and injected back into the tanks; the second part was used as a storage area. The Characterisation plan included the proposal for a more detailed analysis through 3 piezometers, to be carried out up to 60 ml and 5 coring up to a variable depth of 10-17 ml.
The Conference of Services approved the Characterisation Plan and the Municipality of Aprilia released the approval of the Plan (General Protocol no. 3444) on 24th January 2002.
Investigation plan
The investigation plan, as proposed in the approved Plan, took place from 26th February 2002 to 9th April 2004. The following analyses were carried out:
- N° 5 ground drillings at a variable depth of 10-17 ml spc for the ground sampling
- N° 3 piezometers up to a depth of 60 ml spc to take samples of ground water. Continuous analysis of interstitial gases to determine volatile organic compounds (VOC) through photoionisation, in order to determine what ground sections have to be sampled and what depth had to be reached.
Detailed reading of piezometer data and their statistical levels to reconstruct the local layout of the piezometric area.
- Drilling location
Piezometric drillings P1-P2-P3 and corings S1-S2-S3-S4-S5 were located as per table 01. Piezometers were arranged in the shape of an equilateral triangle with 20 ml sides and corings were carried out in a rectangular area having 10 x 20 ml sides - Execution methods
Corings and piezometers were carried out using dry rotating core barrels with 127 mm-diameter pipes. During the execution, a photoioniser monitored the cores and samples were taken and stored in pots; tests were carried out through a probe which analysed gases by optical reading. Groundwater was processed, bottled in glass bottles and labelled. - Topographic survey
It aimed at determining aquifer static levels in different phases, for piezometers P1-P2-P3, but also wells that were present in the area. - Hydrogeological investigation to determine state of the aquifer
- Tests carried out on soil and groundwater
Soil parameters analysed:
- Aromatic organic compounds (benzene, ethylbenzene, styrene, toluene, sirene)
- Chlorinated solvents (chlorinated aliphatics and non-carcinogenic chlorinated aliphatics)
- Light hydrocarbons C< 12 and heavy hydrocarbons C>12
- Metals ( As, Cd, Crtot, Cr VI, Ni, Pb, Zn)
Conclusions
- According to all surveys carried out in the area surrounding the estimated contamination point, next to the East tank, the reference limit values were not exceeded.
- Soil samples from survey S4 show a strong concentration of light hydrocarbons, between 1-8 ml, and a lower concentration of light hydrocarbons (8-13 ml). There is also a low concentration of aromatic organic compounds and heavy hydrocarbons. Tables no.3 and 4 are here attached, and show a summary of the most significant results of this investigations.
- Groundwater is not contaminated, according to the parameters selected for the spill, but As parameters exceed the limits set by the Ministerial Decree.
Polluted surface
According to the investigation: The polluted surface covers 64 m2 and corresponds to a square having coring S4 as its centre and whose sides are 8 ml long. Depth measured is approx. 12-13 ml; approx. 500 m3 of soil to be excavated.
Data
Customer: AEROSEKUR S.p.a.
Area: Aprilia (LT)
Construction site: Manufacturing plant
Total area: mq. 50.000
Description of the job
IIn the 1970s, the area used to belong to one of the "Riva" Group textile companies, and was later purchased by Polluce. The following environmental tests were carried out in this area:- Asbestos mapping and removal from the heating station and tunnels
- Georadar investigation
- Characterisation, in compliance with the Ministerial Decree 471/99
- Groundwater monitoring campaign
Asbestos mapping
A detailed mapping was carried out to identify asbestos-containing elements all over the area, and in particular:
- heating station and
- its tunnels
- in the external areas. On the basis of the results, asbestos-removal interventions were carried out on all elements identified-
Georadar investigation
The Georadar investigation was realised to spot any underground element, such as pipes, tanks and other structures used for past industrial activities. The aim of this investigation was to identify anomalies in the subsoil and optimise direct analyses.
Characterisation plan
The Plan, drawn up according to the Ministerial Decree 471/99, provided for the realisation of the following investigations:- • Soil sampling drillings
- • Groundwater sampling piezometers
- • Analyses of soil and groundwater samplesa
- • Direct excavation investigation for the search of underground objects
- remediation of the fuel oil lifting and distribution system
- decontamination of fuel oil-contaminated soil
- Amount of the contract: € 154,937
Technical data
- area of 12,000
- N° 20 drillings carried out
- N° 100 analyses on soil and groundwater samples
- N° 3 piezometers positioned
- Area treated:
Data
Customer: Tribunale di Milano
Area: Nerviano (Milano)
Construction site: Former thermal Pollux area Central
Work Termination: January 2001
Remediation of polluted soils. Waste management plan, former-Romagnina area in Milan.
The area subject to remediation is included in the U3 intervention unit of the Integrated Intervention Plan for the Garibaldi Repubblica area and falls within the urban development programme of the new Lombardy Region's Administration. This area was intended to be transformed into a public park; the surface to be excavated and sent to an external plant was approx. 1,001 m2. The interventions carried out are the following:
- Validation of soils from each cell to determine their EWC and a suitable disposal site;
- Filling ground excavation;
- Loading and removal of excavated materials, according to their contamination and validations;
- Tests of excavation walls and bottom;
- Backfilling with certified material.
These interventions were carried out in an urban area, where spaces available for operational and worksite needs were limited. Our company had to cope with the following limits:
- partial space and time availability of the working areas;
- car traffic in the areas just outside the worksite, where the operations had to be carried out;
- need to guarantee pedestrian and car passages for inhabitants and shop workers;
- recovery of the areas used.
All precautions needed were taken to minimise the production and the emission of pollutants, such as noise, powders, vibrations, etc., in compliance with environmental regulations and local regulations.
- Extra operations, which had not been foreseen, were needed:
- Tank draining and cleaning
- EWC 160708 sludge disposal, transport included
- EWC 160708 gas oil and washing effluent disposal
- LSC soils disposal, including transport and incineration EWC 160708*
- Plinth demolition
- Ferrous material recovery
- Assistance for war material removal
Data
Customer: IN.G.RE.
Area: Milano
Construction site: area ex Romagnina (zona Repubblica Garibaldi)
Work Termination: 2012
