7/30/2019 R-STG1772N-PRS01-Rev 01 (Excl App D).pdf
http://slidepdf.com/reader/full/r-stg1772n-prs01-rev-01-excl-app-dpdf 1/54
Residential developmentFinedon Road, Irthlingborough
Proposed residential development
off
Finedon Road
Irthlingborough
Northamptonshire
REMEDIAL STRATEGY
Soiltechnics Ltd. Cedar Barn, White Lodge, Walgrave, Northampton. NN6 9PY.
Tel: (01604) 781877 Fax: (01604) 781007 E-mail: [email protected]
Report originators
Prepared by
Sam Dean B.Sc,(Hons)
Geo-environmental Engineer, Soiltechnics Limited
Supervised
David Dunkley B.Sc, (Hons)., CEnv, MSEE,
FGS
Senior geo-environmental Engineer, Soiltechnics Limited
Reviewed
Stephen Cragg B.Sc (Hons)., F.G.S.
Director, Soiltechnics Limited
7/30/2019 R-STG1772N-PRS01-Rev 01 (Excl App D).pdf
http://slidepdf.com/reader/full/r-stg1772n-prs01-rev-01-excl-app-dpdf 2/54
Residential developmentFinedon Road, Irthlingborough
Report status and format
Report statusReport
section
Principal coverage
Revision Comments
1 Introduction 01 Updated November 2010
2 Description of the site 01 Updated November 2010
3 Site history 01 Updated November 2010
4 Geology of the area 01 Updated November 2010 5 Geohydrology of the area 01 Updated November 2010
6 Summary of previous investigations 01 Updated November 2010
7 Preliminary remedial measures 01 Updated November 2010
8 Discussion with Environment Agency and Environmental
Health Officer
01 Updated November 2010
9 Final remedial strategy 01 Updated November 2010
List of drawings
StatusDrawing Principal coverage
Revision Comments
Drawing PRS01 Site location plan 0
Drawing PRS02 Plan showing existing site features and location of
exploratory points
01 Updated November 2010
Drawing PRS03 Plan showing site development proposals and location
of exploratory points
01 Updated November 2010
Drawing PRS04 Plan showing existing site features, location of
exploratory points and proposed cut and fill contours
01 Updated November 2010
Drawing PRS05 Plan showing existing site features, location of
exploratory points and surface geology following site
strip
01 Updated November 2010
Drawing PRS06 Plan showing existing site features, location of
exploratory points and phases of cut and fill operations
01 Updated November 2010
Drawing PRS07 Plan showing existing site features, location of
exploratory points and location of approximate
volumes of hydrocarbon impacted soils requiring
remediation
01 Updated November 2010
Drawing PRS08 Plan showing existing site features, location of
exploratory points and plots in which capping layers
0 Included November 2010
7/30/2019 R-STG1772N-PRS01-Rev 01 (Excl App D).pdf
http://slidepdf.com/reader/full/r-stg1772n-prs01-rev-01-excl-app-dpdf 3/54
Residential developmentFinedon Road, Irthlingborough
List of appendicesAppendix Content
A Definitions of geo-environmental terms used in this report.
B Report by GRS
CMethod Statement in relation to decommissioning of above ground tank and removal of hydrocarbon
impacted soils (R-STG1772N-MS01-Rev0)
D Groundwater Risk Assessment
EMethod statement in relation to excavation and treatment of hydrocarbon impacted soils (R-
STG1772N-MS02-Rev01)
F Remedial Target Worksheets
7/30/2019 R-STG1772N-PRS01-Rev 01 (Excl App D).pdf
http://slidepdf.com/reader/full/r-stg1772n-prs01-rev-01-excl-app-dpdf 4/54
Residential developmentFinedon Road, Irthlingborough
1.0 Introduction
1.1 This remedial strategy describes recommendations to render the site fit for purpose in
relation to chemical contamination identified during past and recent intrusive
investigations. It supersedes our previous Preliminary Remedial Strategy report ref R-
STG1772N-PRS01-Rev0.
1.2 We understand the development will comprise the construction of two to three storey
houses together with access roads and garden/landscaped areas. We have receivedlayout drawings of the proposed development with the layout presented on Drawing
PRS03.
1.3 It should be noted that the some of the following information has been extracted from
Envirocheck data presented in a previous report for the site undertaken by Nicholls
Colton Environmental (ref G08013) dated May 2008. Considering the time since this
report was issued, some the data may have been superseded.
2.0 Description of the site
2.1 The site is located to the north-west of Irthlingborough town centre and situated
between the B5348 and the A6. The grid reference for the site is 494150, 271290. A
plan showing the location of the site is presented on Drawing PRS01.
2.2 At the time of our investigations, the site was accessed from Finedon Road via adriveway surfaced in bituminous bound material and located between some residential
properties. The driveway leads in to a parking area surfaced in bituminous bound
material located immediately adjacent to the entrance to the main building on site. The
main building is of masonry construction with a number of single storey external
workshops and storage areas constructed from profiled sheeting and timber. Gravel
and concrete/bituminous bound hardstanding surrounds the main building.
2.3 Unsurfaced areas of open space were present to the north and west of the mainbuilding, beyond which an embankment feature was evident, ranging from 1.5m to
3.0m in height. A field laid to rough grass occupied the eastern part of the site which
sloped to the north by approximately 1 in 14 towards a small stream flowing east-west
across the site. The stream was dry at the time of our investigations, and it is
understood that the stream runs dry for a large amount of the year. Site levels rise
7/30/2019 R-STG1772N-PRS01-Rev 01 (Excl App D).pdf
http://slidepdf.com/reader/full/r-stg1772n-prs01-rev-01-excl-app-dpdf 5/54
Residential developmentFinedon Road, Irthlingborough
2.4 An above ground tank was located to the south-western corner of the main building on
site, with an approximate 5300 litre capacity. It is understood from previous
investigations undertaken by Nicholls Colton that an area to the north of the main
building was used as a sump for the disposal of waste oil when the site was utilised as a
coach works. Furthermore, Nicholls Colton also identified pipe work likely to be
associated with a cess pit located to the north-eastern corner of the site. A plan
showing the observed site features and location of exploratory points is presented on
Drawing PRS02.
2.5 The nearest surface water feature is the stream located in northern parts of the site.
The River Nene is located approximately 1km to the south-east of the site. Tributaries
of the River Nene are recorded 250mand 750m to the south-east of the site.
3.0 Site history
3.1 The 1885 map records the site as open space with a small quarry and lime kiln situated
to the centre of the site, which by 1900 has been extended with a further lime kilnrecorded. Small buildings are recorded on site also.
3.2 The 1926 map indicates the presence of a large building to the south of the site, with
the quarry and lime kilns to the centre of the site now recorded as a pond and spoil
heap.
3.3 The 1958 map indicates the presence of a small building adjacent to the stream in the
centre of the site.
3.4 The 1964 map indicates construction of further buildings and extension of the large
building to the south of the site. Buildings are now recorded as a works with some
embankment features present to the centre of the site.
3.5 The 1976 map records two above ground tanks on site, one recorded on the south-
western of the main building (now recorded as a depot) and the other recorded to thecentre of the site.
3.6 The 1993 map records the main large building on the site as a factory in addition to
further extensions. The building to the north of the site is no longer present.
7/30/2019 R-STG1772N-PRS01-Rev 01 (Excl App D).pdf
http://slidepdf.com/reader/full/r-stg1772n-prs01-rev-01-excl-app-dpdf 6/54
Residential developmentFinedon Road, Irthlingborough
5.0 Geohydrology of the area
5.1 Inspection of the aquifer designation map records the majority of the site as a major
aquifer, reflecting the near surface Great Oolite Limestone deposits. The soils
containing the aquifer are recorded as high leaching potential. The area of Upper
Estuarine deposits recorded to the north of the site in the area of the stream are
recorded as a minor aquifer of high leaching potential, with a small area on the western
boundary of the site recorded as a major aquifer of intermediate leaching potential.
5.1 The closest registered groundwater abstraction is recorded 1365m to the east of the
site used for irrigation purposes. The site is not located within a zone protecting a
potable water supply abstracting from a major aquifer (i.e. a source protection zone).
The site is not recorded in a fluvial or tidal flood plain.
6.0 Summary of previous investigations
6.1 Nicholls Colton
6.1.1 Investigations have previously been undertaken by Nicholls Colton Geotechnical in May
2008 (report ref G08013) with supplementary investigations undertaken in March 2009
(report ref GR0813-2).
6.1.2 In summary the following was identified from the initial phase of investigations:
• Visual and olfactory evidence of hydrocarbon contamination identified within
backfilled former quarry to the centre of the site and adjacent to the above
ground fuel tank on the south-western corner of the building.
• Elevated concentrations of meals including arsenic, cadmium, lead, nickel,
copper and zinc identified within near surface Made Ground deposits following
laboratory testing.
• Elevated concentrations of organic contaminants including benzo(a)pyrene and
dibenzo(a,h)anthracene identified within Made Ground soils at the sitefollowing laboratory testing.
• Elevated concentrations of total petroleum hydrocarbons (TPH) identified in
near surface Made Ground soils adjacent to the above ground fuel tank
described above and at depth within the area of the former quarry following
laboratory testing.
7/30/2019 R-STG1772N-PRS01-Rev 01 (Excl App D).pdf
http://slidepdf.com/reader/full/r-stg1772n-prs01-rev-01-excl-app-dpdf 7/54
Residential developmentFinedon Road, Irthlingborough
6.1.3 Further investigations were proposed following completion of the initial phase of works,
as follows;
• Rotary boreholes to access potential impact of contamination identified on the
underlying aquifer
• Installation of standpipes within the rotary boreholes will be required to allow
sampling and testing of groundwater and a possible groundwater risk
assessment.
• Supervision/a watching brief of the demolition of existing factory will berequired.
• It should be anticipated that further hotspots of contamination (particularly
hydrocarbons) may be located and need to be sampled and potentially
removed.
• A Site Waste Management Plan should be produced prior to development of
the site.
• A groundwater risk assessment may be required to assess the impact of the site
on the stream.• Water sampling of the stream should be undertaken at both the inlet and the
outlet to the site to ascertain whether the site is impacting upon the quality of
the stream water at present.
• The Environment Agency should be approached to obtain a Waste Management
Exemption with respect to the proposed earthworks exercise.
6.1.4 The findings of the supplementary investigations led to the following measures to be
recommended:
• Further investigation and probable removal (or treatment) of the hydrocarbon
impacted soils in the area of WS2.
• Removal/treatment of hydrocarbon impacted soils in the area of the small
backfilled quarry (area around WS10). A groundwater risk assessment should
be undertaken to determine appropriate remediation target values.
• Installation of a 600mm thick clean soil cover layer in areas of the site wheremade ground is present. This will include the existing Brownfield Zone and
areas of the site to which Made Ground soils will be moved as part of the
proposed cut/fill operation (i.e. parts of the Greenfield Zone).
• Supervision/a watching brief of the demolition of the existing factory and of the
earthworks exercise. It should be anticipated that further hotspots of
7/30/2019 R-STG1772N-PRS01-Rev 01 (Excl App D).pdf
http://slidepdf.com/reader/full/r-stg1772n-prs01-rev-01-excl-app-dpdf 8/54
Residential developmentFinedon Road, Irthlingborough
6.2 Soiltechnics Limited
6.2.1 Soiltechnics Limited were instructed to undertake intrusive investigations at the site in
July 2010 to assess the present day extent contamination of previously identified. In
addition, further cable and tool percussive boreholes and rotary boreholes were
positioned around the site in order to obtain geotechnical information for
foundation/pavement design and to install groundwater monitoring standpipes to
assess potential contamination in the underlying major aquifer.
6.2.2 A total of four cable and tool percussive boreholes, seven rotary boreholes, four insitu
CBR tests and eleven trial pits were undertaken at the site. Positions of trial pits and
boreholes for foundation design purposes were positioned by Brookbanks Limited. Trial
pit and borehole locations to investigate the present day extent of contamination were
positioned by Soiltechnics Limited and agreed with the Environmental Health Officer
(EHO) at East Northants District Council. Refer to Drawing PRS02 for locations of
exploratory points.
6.2.3 Investigations into the extent of contamination previously identified in the former
quarry to the centre of site indicated that hydrocarbons had generally not migrated any
further than that outlined by Nicholls Colton. A small amount of hydrocarbon
contamination was observed in trial pit TP11 between depths of 1.25m to 1.6m below
surface level which was not previously identified. Trial pit TP04 confirmed the presence
of hydrocarbon contamination between depths of 0.9m to the base of the Made
Ground fill at 4.0m. No contamination was observed during the drilling of boreholes
BH01-BH04 and RBH01-RBH06 and all other trial pits but hydrocarbon odours werenoted by the drilling operatives at depths between approximately 7.0m to 7.5m within
deposits of limestone in borehole RBH07.
6.2.4 Laboratory testing of a number of soil samples for within the former quarry area at the
site indicate that total petroleum hydrocarbon contamination is prevalent in soils in
TP04 to depths of at least 2.5m below surface level (refer to attached comparison of
laboratory data). Concentrations pose a risk to human health at present.
Concentrations have been recorded in trial pit TP11 at a depth of 1.4m, however, do not
exceed relevant GAC (generic assessment criteria) in relation to human health and
residential end use.
6.2.5 Concentrations of hydrocarbons identified in the quarry area during previous
investigations by Nicholls Colton indicate that soils between depths of 1 0m and 5 4m
7/30/2019 R-STG1772N-PRS01-Rev 01 (Excl App D).pdf
http://slidepdf.com/reader/full/r-stg1772n-prs01-rev-01-excl-app-dpdf 9/54
Residential developmentFinedon Road, Irthlingborough
6.2.7 Concentrations of contaminants measured within groundwater by Nicholls Colton
indicate minor concentrations of arsenic, copper and mercury. Test data undertaken by
Soiltechnics indicates that elevated concentrations of TPH and benzo(a)pyrene exist in
groundwater within the area of borehole R5. Further testing is being undertaken on
water samples from the site.
6.2.8 During subsequent water monitoring visits to the site, free phase hydrocarbon was
observed on top of the water column in borehole R5. Oil was recorded with an
interface meter to be approximately 400mm thick in early August 2010. During furthermonitoring visits water and free phase liquid was purged from the borehole by hand
and by mechanical pumping (refer to Appendix B for GRS report). Measurements
indicated that free phase initially pumped from the borehole was not recharging.
Recent monitoring visits have not recorded the presence of free phase within borehole
R5, with sampling indicating a minor residue of free phase and associated hydrocarbon
odour.
7.0 Preliminary remedial measures
7.1 Based on the reports presented by Nichols Colton and subsequent fieldwork, the
following remedial measures were recommended within our preliminary remedial
strategy (ref R-STG1772N-PRS01-Rev0);
1. Installation of full radon protection measures in all new developments
2. Following demolition of existing buildings inspection of exposed soils should be
undertaken to confirm, or otherwise, the presence of further contamination
3. Installation of a capping layer in areas of Made Ground
4. Removal and treatment of hydrocarbon impacted soils in area of historic quarry
5. Decommissioning of the existing above ground fuel tank and associated
hydrocarbon impacted soils
6. Potential treatment of hydrocarbon impacted groundwater
7. Continued monitoring of groundwater quality following remedial works
8. Validation of excavations following removal of hydrocarbon impacted soils
9. Potential groundwater risk assessment
8.0 Discussion with Environment Agency and Environmental Health
Officer
7/30/2019 R-STG1772N-PRS01-Rev 01 (Excl App D).pdf
http://slidepdf.com/reader/full/r-stg1772n-prs01-rev-01-excl-app-dpdf 10/54
Residential developmentFinedon Road, Irthlingborough
8.2 On review of laboratory testing undertaken to date, and taken into consideration
environmental and geological/hydrological factors at the site, a Groundwater Risk
Assessment (GRA) was completed to identify the potential risk to water receptors. The
compliance point for the GRA was recommended by the Environment Agency to be
200m from source zone at the site. This was based on the contaminated part of the site
being located in the minor aquifer of the Upper Estuarine Series and the nearest water
receptor of significance being a spring located approximately 200m to the east of the
site.
8.3 Following completion of the GRA, if a potential risk was highlighted, remediation of
hydrocarbon impacted soils would be undertaken. It was agreed that soils would be
excavated and ex-situ remediation using windrows positioned in an appropriate area of
the site would be undertaken. The location of soils placed in the windrows relative to
their position from the excavation should be recorded, with the number and frequency
of validation samples agreed with the Environment Agency and ENC.
8.4 If hydrocarbon impacted soils were to be remediated on site then a Mobile TreatmentLicence (MTL) would be required to undertake such works.
8.5 Following site cut and fill operations, areas in which Made Ground deposits remain at
crop will require a capping layer as agreed with ENC. It was agreed that where natural
soils are anticipated to remain at crop validation would be undertaken and confirmed
(or otherwise) on a ‘plot-by-plot’ basis. Similarly, areas where capping layers are
introduced will be validated, with thicknesses confirmed on completion.
8.6 On completion of all remedial works, further groundwater monitoring wells were
agreed to be installed at the site to validate whether hydrocarbon concentrations
identified in groundwater prior to remedial works have reduced to an acceptable level
post remedial works. Remedial target concentrations will be calculated using the
Environment Agency Remedial Targets Spreadsheet.
7/30/2019 R-STG1772N-PRS01-Rev 01 (Excl App D).pdf
http://slidepdf.com/reader/full/r-stg1772n-prs01-rev-01-excl-app-dpdf 11/54
Residential developmentFinedon Road, Irthlingborough
9.0 Final remedial strategy9.1 Introduction
9.1.1 Based on the reports presented by Nichols Colton and subsequent fieldwork, in addition
to discussions undertaken with relevant authorities, the following remedial measures
were agreed to be undertaken at the site.
1. Installation of full radon protection measures in all new developments2. Installation of hydrocarbon vapour resistant membranes in properties
constructed in areas impacted by hydrocarbon contaminated soils
3. Following demolition of existing buildings inspection of exposed soils should be
undertaken to confirm, or otherwise, the potential presence of further hotspots
of contamination
4. Installation of a capping layer in areas where Made Ground deposits exist at
crop following site works
5. Decommissioning of the existing above ground fuel tank and associatedhydrocarbon impacted soils
6. Groundwater Risk Assessment (GRA) undertaken to determine potential impact
of hydrocarbon contaminated soils and groundwater on local water receptors
7. Removal and treatment of hydrocarbon impacted soils in the area of the
historic quarry if required following completion of the GRA. Following
excavation monitoring and compliance testing should be undertaken.
8. Treatment of hydrocarbon impacted groundwater if required
9. Validation of any excavation following removal of hydrocarbon impacted soils
10. Continued monitoring of groundwater quality following remedial works
9.1.2 The remedial strategy outlined above is discussed in more detail in the following
sections.
9.2 Installation of radon and hydrocarbon resistant membranes
9.2.1 The site is located within an area where full radon protection is recommended, based
on data provided by Building Research Establishment (BRE) and the British Geological
Survey.
9.2.2 As a precaution, it is recommended that hydrocarbon resistant membranes are installed
7/30/2019 R-STG1772N-PRS01-Rev 01 (Excl App D).pdf
http://slidepdf.com/reader/full/r-stg1772n-prs01-rev-01-excl-app-dpdf 12/54
Residential developmentFinedon Road, Irthlingborough
9.3 Identification and procedure to remediate contaminative hotspots
9.3.1 Following demolition of the existing buildings on site, further contamination may be
encountered in soils in areas which have not previously been investigated. In the event
of such areas being identified by contractors on site, Soiltechnics Limited will be notified
of the impacted area and a suitably qualified geo-environmental engineer will visit site
to assess the hotspot.
9.3.2
If required, contaminated soils will be excavated using mechanical plant provided by theon site contractors. Following removal of soils, the engineer will confirm whether or
not all of the impacted soils have been removed by visual and olfactory methods.
9.3.3 Representative soil samples will be taken from the excavation to validate that all
contaminated soils have been successfully removed and that remaining soils do not
present a risk of causing harm to human health/water receptors. Samples will be taken
and sent for testing to an independent specialist testing house, which operates a quality
assurance scheme.
9.3.4 Where previously unidentified contamination is noted, it will be recorded and the
results from any validation testing will be presented along with location drawings to the
EA and ENC.
9.4 Capping layer
9.4.1 With reference to Drawings PRS04 to PRS06 which indicate the locations and phases of proposed cut and fill operations at the site, following the site strip, areas of naturally
deposited Great Oolite Limestone are anticipated to remain at crop in central and
eastern parts of the site. Capping material will not be required in gardens and
landscaped areas in these locations where natural soils remain at crop. Areas of the site
within which Made Ground deposits are used as engineered fill or where such deposits
remain at crop following the site strip will require a capping layer in garden/landscaped
areas. Drawing PRS08 indicates the individual plots in which a capping layer is
anticipated to be required.
9.4.2 The capping layer should be a minimum of 600mm thick in any productive garden areas,
and areas likely to be accessible to young children (considered the critical human
receptor) on a regular (daily basis). In our opinion, this may be reduced to 300mm in
landscaped areas although this should be agreed with the Local Authority Capping
7/30/2019 R-STG1772N-PRS01-Rev 01 (Excl App D).pdf
http://slidepdf.com/reader/full/r-stg1772n-prs01-rev-01-excl-app-dpdf 13/54
Residential developmentFinedon Road, Irthlingborough
9.5 Decommissioning of the existing above ground fuel tank
9.5.1 A separate method statement has been prepared regarding the decommissioning of the
existing above ground fuel tank and associated hydrocarbon impacted soils (ref R-
STG1772N-MS01-rev0) which is presented in Appendix C.
9.6 Groundwater Risk Assessment (GRA)
9.6.1 Following discussion with the EA and ENC, the contamination identified within the
backfilled former quarry was identified as posing a potential risk to groundwater
therefore a GRA was agreed to be undertaken.
9.6.2 The assessment of the hydrocarbon impacted soils in the former quarry suggests that
those contaminated soils within the former quarry pose a risk to groundwater.
Consequently, remediation is considered to be necessary. The GRA report is presented
in Appendix D.
9.6.3 Following the advice given in previous reports, we recommend that remediation takes
the form of bulk excavation of contaminated soils and onsite ex-situ bioremediation.
9.7 Excavation and treatment of hydrocarbon impacted soils
9.7.1 Soils are to be stockpiled in windrows a periodically turned to encourage bio-
degradation.
9.7.2 A separate method statement has been prepared regarding the excavation and
treatment of hydrocarbon impacted soils at the site (ref R-STG1772N-MS02-Rev01),
which is presented in Appendix E.
9.8 Remedial target concentrations
9.8.1 Due to the complexities in modelling hydrocarbons with the approach taken, remedial
targets for the ex-situ bioremediation were not presented within our GRA report (referto Appendix D for details).
9.8.2 Remedial target concentrations have been calculated using the Remedial Targets
Worksheet issued by the Environment Agency. All of the parameters used within the
GRA modelling have been used within the assessment to derive remedial targets
7/30/2019 R-STG1772N-PRS01-Rev 01 (Excl App D).pdf
http://slidepdf.com/reader/full/r-stg1772n-prs01-rev-01-excl-app-dpdf 14/54
Residential developmentFinedon Road, Irthlingborough
9.8.3 The following table presents the remedial target concentrations for each individual
aliphatic and aromatic hydrocarbon fraction.
Table summarising remedial target concentrations
Hydrocarbon
Fraction
Remedial target
concentration (mg/kg)
aliphatic >C5-C6 2.18
aliphatic >C6-C8 11aliphatic >C8-C10 86
aliphatic >C10-C12 684
aliphatic >C12-C16 13645
aliphatic >C16-C21 1.72E+06
aliphatic >C21-C35 2.72E+10
aromatic >C5-C7 0.22
aromatic >C7-C8 0.69
aromatic >C8-C10 4.32aromatic >C10-C12 6.84
aromatic >C12-C16 13
aromatic >C16-C21 43
aromatic >C21-C35 343
Table reference 9.8.3
9.8.4 At this stage, it is not clear where soils will be deposited following remediation. Once
the location of the placement has been chosen, the remedial targets presented abovemay require revision to maintain protection of receptors.
9.9 Monitoring and compliance
9.9.1 Laboratory testing will be undertaken on soil samples from the sides of the excavation
following removal of hydrocarbon impacted soils to confirm or otherwise that all
impacted soils have been removed. Testing will also be undertaken on the stockpiled
soils during the remedial process to monitor the effectiveness of such works. Testingwill be undertaken until compliance with the remedial target concentrations outlined
above has been achieved.
9.9.2 Soiltechnics Limited has consulted with the Environmental Health Officer at ENC
regarding the quantity and type of sampling/testing that will be deemed acceptable.
7/30/2019 R-STG1772N-PRS01-Rev 01 (Excl App D).pdf
http://slidepdf.com/reader/full/r-stg1772n-prs01-rev-01-excl-app-dpdf 15/54
Residential developmentFinedon Road, Irthlingborough
9.9.5 Hydrocarbon impacted soils excavated from the former quarry area will be treated on
site using ex-situ bioremediation methods (refer to Appendix E for details). A
composite sample will be taken for every 200m3
of soil excavated, with testing
undertaken at various stages of the remedial process.
9.9.6 Test results will be evaluated and compared directly with the relevant target
concentrations for each individual hydrocarbon fraction calculated from the Remedial
Target Spreadsheet. It has been agreed that the data will be assessed based on the
calculation of a 95% Upper Confidence Limit (UCL). The UCL provides an estimate of the
population mean, based on test data, with a 95% confidence that the actual mean does
not exceed this value.
9.9.7 If groundwater is encountered and is suspected to be contaminated it will be
channelled into an appropriately sized sump, with any free phase removed from the
water using absorbent ‘booms’. The remaining water shall either be tested to confirm
whether or not it can remain in the excavation or, pumped out and appropriatelydisposed of off site.
9.10 Soil sampling methods and laboratory testing
9.10.1 Soil samples for subsequent laboratory determination of concentration of chemical
contaminants will be taken from the sides of excavations using clean stainless steel
equipment and stored in an amber glass jar with a PTFE sealing washer, labelled and
sealed. The stainless steel sampling equipment was cleaned with deionised waterbetween sampling points.
9.10.2 If groundwater is encountered, samples will be taken from the excavation using new
proprietary plastic bailing equipment. The sample will be placed in a new amber glass
jar quickly sealed with a screw cap with a PTFE washer and subsequently labelled.
9.10.3 Sampling within stockpiled material and from the sides/base of the excavation will be
undertaken based on guidance presented in BS EN 932-1:1997 – “Testing for general
properties of aggregates” . Samples of equal size shall be taken from the stockpiles on
site at different points at different heights and depths over the complete stockpile,
subject to forming one composite sample per 200m3
of soil.
9 10 4 Drawings will be compiled during the remedial process which indicates the approximate
7/30/2019 R-STG1772N-PRS01-Rev 01 (Excl App D).pdf
http://slidepdf.com/reader/full/r-stg1772n-prs01-rev-01-excl-app-dpdf 16/54
Residential developmentFinedon Road, Irthlingborough
9.11 Backfilling remedial excavations and historic well
9.11.1 Remedial excavations are likely to be backfilled with site won material, either from
areas where reduction of levels are proposed or using remediated soils originally
excavated from the former quarry (subject to complying with remedial target
concentrations).
9.11.2 A detailed method statement which includes a specification for the backfilling of
excavations will be issued following further liaison and consultation with the structural
engineers on the project.
9.11.3 During the recent demolition of existing buildings on site, a 2.0m diameter, masonry
lined well was discovered underneath the floor slab of the former factory building. The
well measured a depth of 9.0m, with water recorded a depth of 5.1m below existing
surface level (refer to Drawing PRS02 for position). The area surrounding the well has
been suitably fenced off at present to ensure the safety of any third party on site.
9.11.4 With reference to Drawing PRS03, the well is positioned within the footprint of a
proposed development. As such, the well will require appropriate decommissioning
and backfilling to ensure that the development can proceed in this area. As described
above, further liaison and consultation with the structural engineers on the project will
be required in order to present a specification regarding the decommissioning and
backfilling of the well.
9.11.5 Guidance presented in the Environment Agency document “DecommissioningRedundant Wells and Boreholes” will be followed in the production of any method
statement/specification. Such documentation will be issued in due course.
7/30/2019 R-STG1772N-PRS01-Rev 01 (Excl App D).pdf
http://slidepdf.com/reader/full/r-stg1772n-prs01-rev-01-excl-app-dpdf 17/54
Residential development
Finedon Road, Irthlingborough
Site location Grid Ref 494150, 271290
7/30/2019 R-STG1772N-PRS01-Rev 01 (Excl App D).pdf
http://slidepdf.com/reader/full/r-stg1772n-prs01-rev-01-excl-app-dpdf 18/54
7/30/2019 R-STG1772N-PRS01-Rev 01 (Excl App D).pdf
http://slidepdf.com/reader/full/r-stg1772n-prs01-rev-01-excl-app-dpdf 19/54
7/30/2019 R-STG1772N-PRS01-Rev 01 (Excl App D).pdf
http://slidepdf.com/reader/full/r-stg1772n-prs01-rev-01-excl-app-dpdf 20/54
7/30/2019 R-STG1772N-PRS01-Rev 01 (Excl App D).pdf
http://slidepdf.com/reader/full/r-stg1772n-prs01-rev-01-excl-app-dpdf 21/54
7/30/2019 R-STG1772N-PRS01-Rev 01 (Excl App D).pdf
http://slidepdf.com/reader/full/r-stg1772n-prs01-rev-01-excl-app-dpdf 22/54
7/30/2019 R-STG1772N-PRS01-Rev 01 (Excl App D).pdf
http://slidepdf.com/reader/full/r-stg1772n-prs01-rev-01-excl-app-dpdf 23/54
7/30/2019 R-STG1772N-PRS01-Rev 01 (Excl App D).pdf
http://slidepdf.com/reader/full/r-stg1772n-prs01-rev-01-excl-app-dpdf 24/54
7/30/2019 R-STG1772N-PRS01-Rev 01 (Excl App D).pdf
http://slidepdf.com/reader/full/r-stg1772n-prs01-rev-01-excl-app-dpdf 25/54
7/30/2019 R-STG1772N-PRS01-Rev 01 (Excl App D).pdf
http://slidepdf.com/reader/full/r-stg1772n-prs01-rev-01-excl-app-dpdf 26/54
Appendix ADefinition of geo-environmental terms
Definition of environmental r isk/hazard terms used in this report.
Based on CIRIA report C552 ‘Contaminated land risk assessment – A guide to good practice’. Potential hazard severity definition
Category Definition
Severe Acute risks to human health, catastrophic damage to buildings/property, major pollution
of controlled
waters
Medium Chronic risk to human health, pollution of sensitive controlled waters, significant effects
on sensitive ecosystems or species, significant damage to buildings or structures.
Mild Pollution of non sensitive waters, minor damage to buildings or structures.
Minor Requirement for protective equipment during site works to mitigate health effects,
damage to non sensitive ecosystems or species.
Probability of risk definition
Category Definition
High likelihood Pollutant linkage may be present, and risk is almost certain to occur in long term, or
there is evidence of harm to the receptor.
Likely Pollutant linkage may be present, and it is probable that the risk will occur over the long
term
Low likelihood Pollutant linkage may be present, and there is a possibility of the risk occurring, although
there is
no
certainty
that
it
will
do
so.
Unlikely Pollutant linkage may be present, but the circumstances under which harm would occur
are improbable.
Level of risk for potential hazard definition
Probability of
risk
Potential severity
Severe Medium Mild Minor
High Likelihood Very high High Moderate Low/Moderate
Likely High Moderate Low/Moderate Low
Low Likelihood Moderate Low/Moderate Low Very low
A di A
7/30/2019 R-STG1772N-PRS01-Rev 01 (Excl App D).pdf
http://slidepdf.com/reader/full/r-stg1772n-prs01-rev-01-excl-app-dpdf 27/54
Appendix ADefinition of geo-environmental terms
Definition of environmental r isk/hazard terms used in this report.
Based on CIRIA report C552 ‘Contaminated land risk assessment – A guide to good practice’. Risk classifications and likely action required: Very high risk
High probability
that
severe
harm
could
arise
to
a designated
receptor
from
an
identified
hazard
OR
there
is
evidence that severe harm to a designated receptor is currently happening. This risk, if realised is likely to
result in substantial liability. Urgent investigation and remediation are likely to be required.
High risk
Harm is likely to arise to a designated receptor from an identified hazard. This risk, if realised, is likely to result
in substantial liability. Urgent investigation is required and remedial works may be necessary in the short term
and are likely over the long term.
Moderate risk
It is possible that harm could arise to a designated receptor from an identified hazard. However, it is either
relatively unlikely that any such harm would be severe, or if any harm were to occur it is likely that the harm
would be relatively mild. Investigation is normally required to clarify risks and to determine potential liability.
Some remedial works may be required in the long term.
Low risk It is possible that harm could arise to a designated receptor from an identified hazard but it is likely that this
harm, if realised,
would
at
worst
normally
be
mild.
Very low risk
It is a low possibility that harm could arise to a designated receptor. On the event of such harm being realised
it is not likely to be severe.
A di A
7/30/2019 R-STG1772N-PRS01-Rev 01 (Excl App D).pdf
http://slidepdf.com/reader/full/r-stg1772n-prs01-rev-01-excl-app-dpdf 28/54
Appendix ADefinition of geo-environmental terms
Gaseous contamination -Extract copy of table 3 of BS8485:2007 Solut ions scores
PROTECTION ELEMENT/SYSTEM SCORE COMMENTS
a) Venting/dilution (see Annex A of BS8485)
Passive sub‐floor ventilation (venting layer can be a clear void or
formed using gravel, geocomposites, polystyrene void formers,
etc) A)
Very good
performance
2.5 Ventilation performance in accordance with
Annex A of BS8485.
Good
performance
1
If passive ventilation is poor this is generally
unacceptable and some form of active system
will be required.
Subfloor ventilation
with
active
abstraction/pressurization
(venting
layers
can
be
a
clear void or formed using gravel, geocomposites, polystyrene void formers, etc)A)
2.5
There have
to
be
robust
management
systems
in
place to ensure the continued maintenance of
any ventilation system.
Active ventilation can always be designed to
meet good performance.
Mechanically assisted systems come in two main
forms: extraction and positive pressurization
Ventilated car park (basement or undercroft) 4 Assume car park is vented to deal with car
exhaust fumes, designed to Building Regulations
Document
F
and
IStructE
guidance.
b) Barriers
Floor Slabs It is good practice to install ventilation in all
foundation systems to effect pressure relief as a
minimum. Block and beam floor slab 0
Reinforced concrete ground bearing floor slab 0.5
Reinforced concrete ground bearing foundation raft with limited service
penetrations that are cast into slab
1.5 Breaches in floor slabs such as joints have to be
effectively sealed against gas ingress in order to
maintain these performances. Reinforced concrete cast in situ suspended slab with minimal service penetrations
and water bars around all slab penetrations and at joints
1.5
Fully tanked
basement
2
c) Membranes
Taped and sealed membrane to reasonable levels of workmanship/in line with
current good practice with validation
B), C)
0.5 The performance of membranes is heavily
dependent on the quality and design of the
installation, resistance to damage after
installations, and the integrity of joints. Proprietary gas resistant membrane to reasonable levels of workmanship/in line
with current good practice under independent inspection (CQA) B), C)
1
Proprietary gas resistant membrane installed to reasonable levels of
workmanship/in line with current good practice under CQA with integrity testing
and independent validation.
2
d) Monitoring and detection (not applicable to non‐managed property, or in isolation)
Intermittent monitoring using hand held equipment 0.5 Where fitted, permanent monitoring system
ought to be installed in the underfloor
venting/dilution system in the first instance but
can also be provided within the occupied space
as a fail safe.
Permanent monitoring and alarm system
A) Installed in the underfloor
venting/dilution system
2
Installed in the building 1
7/30/2019 R-STG1772N-PRS01-Rev 01 (Excl App D).pdf
http://slidepdf.com/reader/full/r-stg1772n-prs01-rev-01-excl-app-dpdf 29/54
Part of the BAUER group
Skimming Pump Trial for Soiltechnics
Irthlingborough
August 17
th
& 18
th
2010
Report of Trial and Findings
A 2” GRS pneumatic skimming pump was installed into a 2” monitoring well, in order to
evaluate the rate of oil removal from the well and the easy of recovery of the oil.
August 17th
The initial dips were taken by the Soiltechnics Engineer and reported as:
Depth to Oil (DTO) 6.98m
Depth to Water (DTW) 7.30m
Therefore the oil layer thickness in the well was 320 mm. This represented 0.6 litres within
the well. It was noted that this volume of oil would fill 8 meters of the 10mm product
discharge line utilised in the trial.
The skimming pump was inserted into the well such that the oil surface would be at its mid
travel point. The pump was operated for 20 minutes. No oil or water arrived at the surface
during this period.
The pump was removed and the float deliberately slightly submerged in order that it would
skim any oil at the surface, together with a small quantity of water. The pump was operated
for circa 10 minutes, after which there was no sign of further oil or water arriving at thesurface. The small sample of liquid pumped to the surface was inspected and it was seen that
there was a very small quantity of oil present: insufficient to form a uniform layer over the
surface of the water in a 1 litre sample bottle.
The pump was removed from the well and the well re-dipped. The readings were:-
7/30/2019 R-STG1772N-PRS01-Rev 01 (Excl App D).pdf
http://slidepdf.com/reader/full/r-stg1772n-prs01-rev-01-excl-app-dpdf 30/54
7/30/2019 R-STG1772N-PRS01-Rev 01 (Excl App D).pdf
http://slidepdf.com/reader/full/r-stg1772n-prs01-rev-01-excl-app-dpdf 31/54
11:48 The pump was removed and the well dipped. The values were:-
Time Depth to Oil Depth to Water Oil Thickness11:49 Not detectable 7.094 0 mm
This indicated that the water level in the well had been depressed by 7.094 - 6.990 = 104 mm
The recovery rate of the well was measured as follows:-
Time Depth to Oil Depth to Water Oil Thickness
11:49 Not detectable 7.094 0 mm
11:52 Not detectable 7.089 0 mm
11:53 Not detectable 7.088 0 mm
11:54 Not detectable 7.085 0 mm
11:55 Not detectable 7.083 0 mm
11:56 Not detectable 7.081 0 mm11:57 Not detectable 7.079 0 mm
11:58 Not detectable 7.077 0 mm
11:59 Not detectable 7.076 0 mm
12:00 Not detectable 7.074 0 mm
12:01 Not detectable 7.072 0 mm
12:05 Not detectable 7.067 0 mm
12:10 Not detectable 7.061 0 mm
12:15 Not detectable 7.055 0 mm
12:20 Not detectable 7.050 0 mm
12:25 Not detectable 7.046 0 mm
12:30 Not detectable 7.043 0 mm
12:40 Not detectable 7.036 0 mm
12:50 Not detectable 7.031 0 mm
13 00
7/30/2019 R-STG1772N-PRS01-Rev 01 (Excl App D).pdf
http://slidepdf.com/reader/full/r-stg1772n-prs01-rev-01-excl-app-dpdf 32/54
The data recorded is plotted graphically as follows:-
August 18th, 2010 - Recovery Rate Trial - Irthlingborough
6.98
7
7.02
7.04
7.06
7.08
7.1
11:45 12:00 12:15 12:30 12:45 13:00 13:15 13:30 13:45 14:00 14:15 14:30 14:45
Time
D e p t h t o W a t e r
The key data observed were:-
1. With the water table at circa 7 m below surface and with a well level depression of
104 mm, the steady state water inflow rate was 2.22 litres/hour.2. The recovery time from 104 mm level depression was 2 hrs 56 mins.
3. Little oil was present in the well during these trials. Once all the oil had been removed,
negligible oil returned to the well. There was a thin smear of a dark coloured oil on the
end of the probe, but this was insufficient to be detectable.
It should be noted that the water table was in a relatively impermeable layer of clay at the
time of these trials. It is recommended that the well is closely monitored when the water table returns to the more porous higher layer. Under these conditions, as the level rises and
falls, it is possible that more oil may migrate into the well, if it is currently trapped in domes
and troughs in the fractured rock in this layer. If significant oil does arrive at the well, such
that skimming were to be considered as a treatment option in the future, it is important to
collect a reasonable quantity of this oil (at least 2 litres) in order that its characteristics can be
Residential developmentFi d R d I thli b h
7/30/2019 R-STG1772N-PRS01-Rev 01 (Excl App D).pdf
http://slidepdf.com/reader/full/r-stg1772n-prs01-rev-01-excl-app-dpdf 33/54
Finedon Road, Irthlingborough
Proposed residential development
off
Finedon Road
IrthlingboroughNorthamptonshire
METHOD STATEMENT FOR DECOMISSIONING OF ABOVE
GROUND FUEL STORAGE TANK
Soiltechnics Ltd. Cedar Barn, White Lodge, Walgrave, Northampton. NN6 9PY.
Tel: (01604) 781877 Fax: (01604) 781007 E-mail: [email protected]
Report originators
Prepared by
Sam Dean B.Sc,(Hons)
Geo-environmental Engineer, Soiltechnics Limited
Supervised
David Dunkley B.Sc, (Hons)., CEnv, MSEE,
FGS
Senior geo-environmental Engineer, Soiltechnics Limited
Reviewed
Stephen Cragg B.Sc (Hons)., [email protected] Director, Soiltechnics Limited
Report issue
7/30/2019 R-STG1772N-PRS01-Rev 01 (Excl App D).pdf
http://slidepdf.com/reader/full/r-stg1772n-prs01-rev-01-excl-app-dpdf 34/54
7/30/2019 R-STG1772N-PRS01-Rev 01 (Excl App D).pdf
http://slidepdf.com/reader/full/r-stg1772n-prs01-rev-01-excl-app-dpdf 35/54
7/30/2019 R-STG1772N-PRS01-Rev 01 (Excl App D).pdf
http://slidepdf.com/reader/full/r-stg1772n-prs01-rev-01-excl-app-dpdf 36/54
Residential developmentFinedon Road Irthlingborough
7/30/2019 R-STG1772N-PRS01-Rev 01 (Excl App D).pdf
http://slidepdf.com/reader/full/r-stg1772n-prs01-rev-01-excl-app-dpdf 37/54
Finedon Road, Irthlingborough
Proposed residential development
off
Finedon RoadIrthlingborough
Northamptonshire
METHOD STATEMENT FOR REMEDIATION OFHYDROCARBON CONTAMINATED SOILS
Soiltechnics Ltd. Cedar Barn, White Lodge, Walgrave, Northampton. NN6 9PY.
Tel: (01604) 781877 Fax: (01604) 781007 E-mail: [email protected]
Report originators
Prepared by
Sam Dean B.Sc,(Hons)
Geo-environmental Engineer, Soiltechnics Limited
Reviewed
by
David Dunkley B.Sc, (Hons)., CEnv, MSEE,
FGS
Senior geo-environmental Engineer, Soiltechnics Limited
Report issue
7/30/2019 R-STG1772N-PRS01-Rev 01 (Excl App D).pdf
http://slidepdf.com/reader/full/r-stg1772n-prs01-rev-01-excl-app-dpdf 38/54
Residential developmentFinedon Road Irthlingborough
7/30/2019 R-STG1772N-PRS01-Rev 01 (Excl App D).pdf
http://slidepdf.com/reader/full/r-stg1772n-prs01-rev-01-excl-app-dpdf 39/54
Finedon Road, Irthlingborough
Remediation of hydrocarbon impacted soils
As previously mentioned hydrocarbon impacted soils identified within the area of the former quarry
will be excavated and treated on site and potentially re-used on site. The use of windrows is
proposed for the treatment of hydrocarbon contaminated soils at the site. Such systems will allow
frequent aeration of the impacted soils, increasing microbial activity and encouraging
biodegradation of organic contaminants under aerobic conditions. Microbes will utilise the source
of carbon and energy within the contamination and degrade it, with carbon dioxide and water being
the major waste products.
The excavated hydrocarbon impacted soils will be placed into shaped piles generally between 1.5m
and 2.0m in height and up to 6.0m in width. Soils will be placed onto an impermeable membrane to
prevent hydrocarbons leaching into soils below. The membrane will be bedded on a layer of sand to
prevent it being pierced on rough ground during periods of turning. We also recommend that a
layer of sand approximately 300mm in thickness is placed on top of the membrane acting as a
marker layer which should prevent the membrane being pierced by machinery. The sand will also
absorb any potential free-phase hydrocarbon contamination and contaminated water which is
contained in the soil. An impermeable bund will be required around the perimeter of the windrows
in order to prevent potential migration of free phase contaminants. Windrows should also be
covered with an impermeable membrane to prevent leaching of contaminants through percolation
of rainwater.
It should be noted that such remediation requires ambient air temperatures to be at a certain level
which will promote the degradation of organic contaminants. During cooler periods of weather, the
decrease in temperatures may ‘kill off’ any microbes at the surface of the windrow. Furthermore,
the low internal temperatures and amount of oxygen within the windrow will cause microbes to
become largely inactive and decrease the eventual breakdown of hydrocarbons.
To improve aeration and speed up the process of degradation, soil organic amendments and
nutrients could be introduced to the windrows during periods of turning. Aeration pipes could also
be introduced to assist in the ventilation of contaminated soils during periods between turnings.
Stockpiles shall be formed depending on the degree of contamination based on visual and olfactorymethods on site. Soils which are deemed to exhibit minor concentrations of hydrocarbon
contamination will be placed into separate windrows to that of soils which exhibit highly elevated
concentrations of hydrocarbon contamination.
Remedial excavation
Residential developmentFinedon Road, Irthlingborough
7/30/2019 R-STG1772N-PRS01-Rev 01 (Excl App D).pdf
http://slidepdf.com/reader/full/r-stg1772n-prs01-rev-01-excl-app-dpdf 40/54
, g g
Re-use of hydrocarbon impacted soils
Following remediation of hydrocarbon impacted soils, additional testing will be undertaken to
determine whether remediation has been successful and soils can be potentially re-used as
engineered fill. Sampling and testing schedules will be issued following remediation. If laboratory
testing indicates contaminants in soils are still at concentrations which may be harmful to human
health and water receptors further remediation will be required. Remedial target concentrations for
soils have been derived using the Remedial Targets Worksheet issued by the Environment Agency.
Further details regarding the remedial targets derived and recommendations for monitoring and
compliance are presented in Section 9.9 of our Remedial Strategy Report (R-STG1772N-PRS01-Rev01).
It should be noted that soils overlying the hydrocarbon impacted material can be reused on site in
their existing condition. Such soils will, however, require inspection as excavations proceed to
confirm that no hydrocarbon contamination is present.
License requirements
The Environment Agency legislation requires a site waste management plan to be prepared for a site
which is to be subject to excavation and movement of contaminated soils.
The contaminated soils, following excavation, will be treated and potentially re-used on site. With
reference to the consultation document produced by the Environment Agency “Land remediation
and Mobile Treatment Licensing” the treatment of contaminated soils is a licensable activity. The
licence used to regulate this activity on site (either in-situ or ex-situ) is a Mobile Treatment License(MTL), as opposed to a site licence. It is understood that such licenses generally apply if remediation
of over 1000m3
of contaminated soils is proposed. As up to approximately 3500m3
of hydrocarbon
impacted soils are proposed to be excavated, a MTL will be required for the site, together with a
deployment form. Further advice and the relevant forms in order to apply for the license are
available from the Environment Agency website.
Method statement alteration/amendments
Any required alterations or amendments to this method statement should be agreed with
Soiltechnics Limited prior to commencing any works on site.
Method statement compliance
7/30/2019 R-STG1772N-PRS01-Rev 01 (Excl App D).pdf
http://slidepdf.com/reader/full/r-stg1772n-prs01-rev-01-excl-app-dpdf 41/54
7/30/2019 R-STG1772N-PRS01-Rev 01 (Excl App D).pdf
http://slidepdf.com/reader/full/r-stg1772n-prs01-rev-01-excl-app-dpdf 42/54
7/30/2019 R-STG1772N-PRS01-Rev 01 (Excl App D).pdf
http://slidepdf.com/reader/full/r-stg1772n-prs01-rev-01-excl-app-dpdf 43/54
7/30/2019 R-STG1772N-PRS01-Rev 01 (Excl App D).pdf
http://slidepdf.com/reader/full/r-stg1772n-prs01-rev-01-excl-app-dpdf 44/54
7/30/2019 R-STG1772N-PRS01-Rev 01 (Excl App D).pdf
http://slidepdf.com/reader/full/r-stg1772n-prs01-rev-01-excl-app-dpdf 45/54
7/30/2019 R-STG1772N-PRS01-Rev 01 (Excl App D).pdf
http://slidepdf.com/reader/full/r-stg1772n-prs01-rev-01-excl-app-dpdf 46/54
7/30/2019 R-STG1772N-PRS01-Rev 01 (Excl App D).pdf
http://slidepdf.com/reader/full/r-stg1772n-prs01-rev-01-excl-app-dpdf 47/54
7/30/2019 R-STG1772N-PRS01-Rev 01 (Excl App D).pdf
http://slidepdf.com/reader/full/r-stg1772n-prs01-rev-01-excl-app-dpdf 48/54
7/30/2019 R-STG1772N-PRS01-Rev 01 (Excl App D).pdf
http://slidepdf.com/reader/full/r-stg1772n-prs01-rev-01-excl-app-dpdf 49/54
7/30/2019 R-STG1772N-PRS01-Rev 01 (Excl App D).pdf
http://slidepdf.com/reader/full/r-stg1772n-prs01-rev-01-excl-app-dpdf 50/54
7/30/2019 R-STG1772N-PRS01-Rev 01 (Excl App D).pdf
http://slidepdf.com/reader/full/r-stg1772n-prs01-rev-01-excl-app-dpdf 51/54
7/30/2019 R-STG1772N-PRS01-Rev 01 (Excl App D).pdf
http://slidepdf.com/reader/full/r-stg1772n-prs01-rev-01-excl-app-dpdf 52/54
7/30/2019 R-STG1772N-PRS01-Rev 01 (Excl App D).pdf
http://slidepdf.com/reader/full/r-stg1772n-prs01-rev-01-excl-app-dpdf 53/54
7/30/2019 R-STG1772N-PRS01-Rev 01 (Excl App D).pdf
http://slidepdf.com/reader/full/r-stg1772n-prs01-rev-01-excl-app-dpdf 54/54