Derby City Council Pride Park Water Treatment Plant Data Review ...

Ove Arup & Partners Ltd 

The Arup Campus 

Blythe Gate 

Blythe Valley Park 

Solihull 

West Midlands 

B90 8AE 

United Kingdom 

www.arup.com 

Derby City Council 

Pride Park 

Water Treatment Plant Data Review 

2006-2011 

WTP/Data Review/001 

Draft 1 | 28 November 2011 

This report takes into account the particular 

instructions and requirements of our client. 

It is not intended for and should not be relied 

upon by any third party and no responsibility is 

undertaken to any third party. 

Job number 118192-00

Document Verification 

Job title Pride Park 

Document title Water Treatment Plant Data Review 2006 2006-2011 

Document ref WTP/Data Review/001 

Revision Date Filename 

Draft 1 28 Nov 

2011 

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WTP data review draft for comment.docx 

Draft For Client Comment 

Job number 

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Docs 2011/wtp/ 

Prepared by Checked by Approved by 

Clare McGuigan Louise Stroud Stewart Jarvis 




Issue Document Verification with Document 

�


Contents 

1 Introduction 

1.1 Objectives 

1.2 Sources of Data 

1.3 Background 

2 Review of WTP Data 2006 Report 

3 Current Groundwater Conditions within the Site 

3.1 Abstraction Rate 

4 

3.2 Water Levels 

5 

3.3 Influent and Effluent Water Chemistry 

6 

3.4 Summar Summary y of the Current Groundwater Conditions Within The 

Site 

8 

4 Typical Groundwater Chemistry Across the Pride Park Site 

4.1 Abstraction Wells 

4.2 Water Chemistry Trends 

4.3 Water Chemistry by AAbstraction 

Well Location 

4.4 Changes in Water Chemistry with Time 

4.5 Current Average Conditions Around the Site 

5 Treatment Options 

6 Operating Costs 

7 Conclusions 

References 

Figures 

Appendices 

Appendix A 

7.1 Recommendations 

Changes in Monitoring Frequencies Between 1998 and 2011 

Appendix B 

EA Spot Sampling Records 

Appendix C 

Extract from WR2 Annual Monitoring Report 2010 


Water Treatment Plant Data Review 2006 2006-2011 

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Water Treatment Plant Data Review 2006 2006-2011


1 Introduction 

In In November November 2012, the Operation and and Maintenance contract for for the the Water 

Water 

Treatment Plant (WTP) at Pride Park is due to expire following a 15 year 

agreement between Derby City Council and Alpheus Environmental Limited. 

Following Following the Derby City City Council procurement guidelines, a new contract to 

operate operate and maintain the the water water treatment plant will go go out out to to tender tender in in mid mid 2012. 

2012. 

The The plant plant has has been been in in operation operation since since January January 1998 1998 and a large body of data has 

been collected ected over this period, including including information information on abstraction volumes, 

volumes, 

flow flow rates, rates, groundwater groundwater levels levels and groundwater quality. quality. In In March March 2006, 2006, Arup 

Arup 

produced produced a a report for for the WTP collating all all groundwater data data between between January 

1998 and March 2005. The purpose of that report was to evaluate the plant 

performance, performance, summarise the the water water quality, and establish the chemistry of the 

ground ground conditions conditions within the the containment containment wall wall and present options for future 

groundwater treatment. 

In preparation for the contract renewal, a review of the current situation at the 

water water treatment treatment plant plant has has been carried carried out compiling all all data data from from the the plant plant from 

from 

1998 1998 to to 2011, 2011, together together with with a a condition condition survey survey of the the plant plant and and equipment equipment which 

which 

has also been undertaken. 

1.1 Objectives 

The aim of compiling compiling all all the data is to establish the current conditions conditions at at the the site 

site 

including the groundwater, chemistry, performance of the abstraction and 

treatment treatment processes. The survey of the plant plant and equipment aims aims to to identify identify the 

the 

current assets and condition of the site. The findings will be used to provide a 

background background to to the project project for the potential new new contractors contractors responsible responsible for 

operating operating and maintaining the the plant and and provide provide a baseline baseline from from which which the 

the 

contract will run. This report comprises the followin following: 

1.1.1 Review and Update the 2006 report 

• Summarise groundwater conditions within and around the site 

• Summarise the site development 

• Establish current groundwater conditions and 

• Identify the typical groundwater chemistry 

This This report will update update the the findings from the 2006 report incorporating the the data 

from January 1998 to August 2011. 

1.1.2 Condition Survey of Existing Plant 

• Assets and Conditions survey 


Water Treatment Plant Data Review 2006- 2006 2011 

A A separate separate report has been produced detailing the condition of of the existing 

plant, [reference [1]. . Information Information has been been supplied from the current current plant 

operators operators and and a list of all all the assets assets on site has been been collated. A site survey 

survey 

was was carried carried out during August 2011 and and photographic evidence was collected. 

collected.


1.1.3 Review of Operating and Maintenance Costs 

• Summary ummary of current operating and maintenance costs 

• Recommendations for cost savings. 

1.2 Sources of Data 

This This report is based based on on data provided provided by Alpheus Environmental Environmental Ltd Ltd up up to to and 

and 

including including August 2011. Certain obvious errors in the dataset dataset have have been been corrected correct 

(e.g. (e.g. units specified specified as as mg/l instead of of ug/l), ug/l), but but no no attempt attempt has has been been made made to 

investigate investigate or or correct individual anomalies and whilst generally generally complete, there 

remains a possibility that the dataset contains some errors. 

Other background sources include; incl 

• Arup Report, Water Treatment Data Review, 2006; Ref:[2] Ref: 

• Arup Report, Pride Park Reclamation Exit Strategy, 2003, Ref [3]; ; and 

• Arup Report, WR2 Annual Monitoring Report, 2011, Ref [4]. 

Derby City Council has also provided a cop copy y of recent invoices for utility bills 

and and other service providers providers involved involved in operation of the the Water Water treatment treatment Plant. 

Plant. 

1.3 Background 



Pride Pride Park is is an area of of over 90Ha of once heavily contaminated contaminated land. land. Previous 

Previous 

uses on the site include Litchurch Gas and Coke Works, a domestic / industrial 

landfill, landfill, a gravel gravel extraction pit pit and a locomotive works. works. The The site site was remediated 

during the 1990s and was generally generally split split into into eastern eastern and western halves. Due Due to 

the depths at which highly contaminated material was identified and the proximity 

to the River Derwent, a 3km long and 10m deep bentonite cut cut-off off wall was 

installed around the eastern half of the site to contain the contamination. 

Further Further pockets of highly highly contaminated material were also also found found in in the the western 

western 

part of f the site. These were removed and placed within one of two on on-site site disposal 

facilities facilities or ‘waste ‘waste repositories’ repositories’ now known as WR1 and and WR2. WR2. Boreholes Boreholes from 

from 

around around the two waste waste repositories repositories are subject to scheduled monitoring monitoring and and are 

are 

licensed under the Environmental nmental Permitting Regulations. 

There There are are two two gas gas holders located located in the middle of of the the site site which which are are no no longer longer in 

in 

operation, operation, see see Figure Figure 1 for for location. location. It should be noted that no reclamation or 

remediation has taken place within the area of the gas holders and the potential for 

contamination from the gas holders still remains. 

Other Other key items items of of the strategy include include a a gas vent trench trench which which was was installed 

installed 

around around part of the the former landfill site and and the groundwater groundwater abstraction and 

treatment treatment plant (the (the WTP) WTP) which which is is required to to control water water levels levels and and treat 

treat 

dissolved phase contamination ation within the bentonite cut off wall. 

A fundamental aspect of the cut cut-off off wall was that groundwater levels within the 

wall wall need need to to be be kept below below the the groundwater groundwater level outside of the the wall to ensure 

that, in the event of damage to the wall's membrane, groundwater movement 

direction direction is is from outside outside to inside inside the wall. Nineteen Nineteen pairs pairs of monitoring monitoring wells 

wells


were were installed inside and and outside of of the wall perimeter to to check check water water levels, levels, see 

see 

Figure 1 for locations. 

In order for groundwater levels to be maintai maintained at the correct level, 18 

abstraction abstraction wells wells were installed adjacent to the wall, see Figure 1 for locations. 

The wells are linked to a ring ring-main main and groundwater is pumped to the Water 

Treatment Plant in the south-eastern south corner of the Pride Park site for r processing 

prior to discharge to the River Derwent. 

2 Review of WTP Data 2006 Report 



A A review review of of the 2006 report report has been been carried carried out and the the findings are summarised 

below: 

After After operating for almost almost eight eight years years the the WTP WTP had had treated treated almost 2.5 2.5 million 

million 

cubic c metres metres of groundwater, groundwater, at at an an average average rate of 10.8 litres per per second second (l/s). 

Average Average flow flow rates slowly declined declined from 2000 onwards to to rate rate of of about about 6 6 l/s l/s in 

in 

2005. 

The The plant plant had had been been largely successful in controlling controlling water water levels levels inside the cut-off cut 

wall. However, wever, it it had had proved proved difficult difficult to to control control water water levels levels along along the the part part of of the 

cut-off off adjacent to the River Derwent. Alpheus report that the boreholes in this 

area are very slow to recharge therefore limiting the length of time for which they 

can be pumped. This his has resulted resulted in the most critical part of the site struggling struggling to 

to 

maintain the desired water levels inside the wall. 

Comparison Comparison of of influent influent and and effluent effluent water water chemistry indicated that that the plant plant had 

achieved levels of water treatment consistent with ppredictions. 

redictions. In particular, the 

plant plant had had been been successful successful at at treating high high influent influent ammonia ammonia concentrations concentrations and and it 

it 

was was the the resulting resulting elevated concentrations concentrations of total oxidised oxidised nitrogen (TON) that 

now controlled the operation of the abstraction system. As the ammonia is treated 

the the level level of TON TON increases as as a result of the the treatment process. process. It It was was now now a 

a 

balance balance to to keep both both the ammonia ammonia and and the the resulting TON TON below the consent 

limits. 

The The plant plant had had been been successful at removing solids, metals metals and reducing reducing BOD. BOD. The 

plant plant processes processes appeared to have had little effect effect on on concentrations concentrations of of organic 

organic 

contaminants contaminants or or cyanide. cyanide. This This was a a possible cause of concern as elevated 

influent influent concentrations may may have resulted in breaches of of consent consent limits limits and and could 

could 

have an effect on the he biological biological processes operating in the the treatment process. 

The The cyanide cyanide concentrations were were of of particular particular concern, and appeared to to have have risen 

risen 

above above consent consent limits limits in in 2004. 2004. Further Further discussion discussion with with Alpheus and and the the testing 

laboratory, Alcontrol, was complete completed d to check that the apparent rise in free 

cyanide cyanide concentrations was was real. It It was found found that that the the laboratories laboratories had had in in fact fact been 

been 

measuring measuring and and reporting reporting the total cyanide rather than than the free free cyanide cyanide content. 

content. 

Confirmatory and contemporaneous analysis completed by the EA indicated that 

free free cyanide cyanide concentrations had had remained remained within consent limits limits over over this this period. 

period. 

Concentrations Concentrations of of ammonia, ammonia, TON TON and and BOD were were highest highest in boreholes AW13 to 

AW15 adjacent to the most recent area of tipping in the historic domesti domestic c landfill. 

Ammonia Ammonia concentrations concentrations in these boreholes had reduced with time and were 

typically typically lower lower adjacent adjacent to the the older, ashier part of of the the landfill landfill and and to to the the west west and 

and 

north.


3 Current Current Groundwater Groundwater Conditions within 

the Site 

The groundwater monitoring fo for r the WTP at Pride Park is currently carried out by 

Alpheus Alpheus Environmental Environmental Ltd, Ltd, under their their current operating and and maintenance 

maintenance 

contract. 

The The monitoring monitoring currently includes continuous continuous monitoring monitoring of of inlet inlet (i.e. (i.e. influent) 

influent) 

and outlet (i.e. effluent) via on-site on data loggers and off site monitoring of 

abstraction abstraction wells wells and monitoring wells. Frequencies of of the the current current monitoring 

monitoring 

regime are provided in Appendix A. 

Abstraction volumes are monitored at the inlet to the treatment plant. 

Groundwater levels are monitored at observation well pairs located at intervals 

inside and outside the cut-off off wall wall (refer to Figure 1). Water samples are taken for 

analysis analysis at at abstraction abstraction wells, wells, monitoring monitoring wells wells and and at at the the inlet inlet and and outlet outlet of the 

plant. On-line line monitors of influent and effluent e water chemistry provide 

effectively continuous measurement of a few key parameters. 

Monitoring Monitoring conditions conditions were laid laid out in the discharge consent consent T/48/45190/T T/48/45190/T in 

in 

1997. 1997. After nine years of monitoring monitoring the frequencies frequencies for for various various parameters parameters were 

were 

reduced d in in 2006, 2006, following following authorisation authorisation from from the the Environment Environment Agency. Agency. Further 

reductions reductions were were recommended recommended and and approved approved in in 2009. 2009. Details Details of of the the reductions reductions in 

in 

monitoring monitoring frequencies and the the current monitoring monitoring frequencies are are provided provided in 

Appendix A. 

3.1 Abstraction Rat Rate 



Abstraction Abstraction volumes volumes are are monitored monitored at at the the inlet inlet to the Water Water Treatment Treatment Plant. 

Plant. 

Figure 2 presents monthly average abstraction rate metered at the Water 

Treatment Plant inlet. 

Abstraction Abstraction data data have been been collected collected since since January 1998. 1998. The information is 

collected cted on a a monthly monthly basis and and includes all all data data from from 1998 1998 up until August 

2011. 2011. During this this time time the the plant plant has has treated over over 3.8 million million cubic cubic metres metres of 

of 

groundwater, groundwater, at an average rate of 9.0 litres per second (l/s). (l/s). The monthly input 

rates have varied between n 3.5 and 17.8 l/s. 

Prior to 2006, the annual volume of abstracted water averaged at 345,570m 

Since 2006, the volume of water abstracted each year has reduced and in 2010 a 

total volume of 182,234m 3 

Prior to 2006, the annual volume of abstracted water averaged at 345,570m Since 2006, the volume of water abstracted each year has reduced and in 2010 a 

3 

of water was abstracted for treatment. 

3 . 

Since 2006, the volume of water abstracted each year has reduced and in 2010 a 

The annual abstraction raction rates have reduced from an average of of 12.4l/s in 1998 to 

to 

5.8l/s 5.8l/s in in 2010. 2010. The The abstraction abstraction rates rates for for January January 2011 2011 to August August 2011 (to date) 

suggest suggest further further reduction in in the the annual annual abstraction abstraction rates rates when when compared compared to to the 

the 

same period last year. 

The WTP TP was designed designed to to receive receive an an input input maximum of 33 33 l/s. This figure has 

never never been been approached approached and and at present present the plant plant is is receiving receiving less less than than 18% 18% of of the 

the 

design capacity.


Figure Figure 2 also also shows shows the power usage usage per unit volume of water treated. The 

average annual l power power consumption consumption has has reduced reduced from from 565MWh 565MWh in in 1998 1998 to 

208MWh 208MWh in in 2010, 2010, with with a a noticeable noticeable drop drop in energy usage usage noted from 2005, since 

then then the the annual annual average consumption has has been below 303MWh. 303MWh. The The plant plant is 

is 

using less energy although this is coupled with lless 

ess water being abstracted from 

the site. 

In In 2006, 2006, the the results results indicated indicated a a correlation correlation between plant plant efficiency efficiency and volume of 

water water treated; treated; i.e. the plant uses uses more power per cubic metre metre of of water water at at lower 

lower 

inflow rates. The greater the amount of water tre treated ated the more efficient the plant 

becomes becomes and and conversely conversely the the lower lower the abstraction rates the the less less efficient efficient the the plant 

plant 

becomes. 

The The potential potential correlation between between abstraction rate and and water water levels levels around around the 

the 

inside of the cut-off off wall is discussed in the fo following section. 

3.2 Water Levels 



The The groundwater groundwater abstraction abstraction system system is designed to keep water water levels levels within within the 

the 

cut-off off wall wall at at or or below below those those outside, to to prevent water and and contamination from 

escaping escaping under under the the wall wall through induced head pressure. The The system system includes includes pairs 

pairs 

of monitoring wells, lls, located located on either either side of the containment wall, whose 

whose 

purpose purpose is is to evaluate whether whether the desired water level gradient gradient across across the the wall wall is 

is 

achieved. 

The The dataset dataset for for the the wall wall monitoring monitoring wells wells has has water water level records from January 

1998 to April 2011. Monitoring toring was was conducted on average average every every two weeks 

weeks 

during during 1998, monthly during during 1999 1999 and 2000 and and less less frequently thereafter. thereafter. A total 

of of 118 118 monitoring rounds, up up to April 2011, have been carried out over over a a period 

period 

of almost 14 years. 

Water level data are presented ented in two ways. Figure 3 shows, for each monitoring 

well well pair, pair, the percentage of of monitoring rounds in which water water level level outside outside the 

the 

wall wall was was greater greater than than water water level inside inside the the wall wall (i.e. (i.e. the the desired desired direction direction of of water 

water 

level gradient was achieved). Figu Figure re 4 presents, for each pair of wells, the average 

water water level level difference difference over over all all monitoring monitoring rounds; a a positive positive difference indicating 

indicating 

water level outside is greater than water level inside. 

The 2006 report found that between chainages Ch. 2060 (MW15) anti anti-clockwise clockwise 

to to Ch. Ch. 870(MW6) 870(MW6) the water level level objective was achieved in approximately 90% 

or or more more monitoring monitoring rounds rounds i.e. water level elevations outside outside were were greater greater than 

than 

inside for most of the time. 

The updated results for each monitoring well pair between 11998 

998 and 2011 indicate 

a similar pattern, in that the same length of the cut cut-off off achieved the water level 

objective objective over over 92% 92% or more more monitoring rounds. The length length of of wall wall between 

between 

MW15 MW15 to to MW6 MW6 occupies the the south western western part part of of the the site site and and is is not not situated 

situated 

along the river. 

Only Only one one monitoring monitoring well well pair, pair, MW3, MW3, achieved achieved the desired water water levels levels for 100% 

100% 

of the time, located at Ch. 380 

Figure Figure 3 also also shows shows that between between 1998 1998 and and 2011 2011 between between MW7 MW7 to to MW14 MW14 the 

the 

water level objective was achieved on average only 35% of tthe 

he time. These 

monitoring monitoring well pairs along the eastern eastern edge of Pride Park, Park, did did not not achieve achieve the 

the


level level objective as as frequently, with the worst performing pairs (MW12 at Ch. 1600 

and and MW13b at at Ch. Ch. 1715) 1715) achieving achieving the the objective in in only only 17 17 % % of of monitoring 

monitoring 

rounds. 

As As with the the 2006 report report Figure Figure 4 4 shows the the average water water level level differences differences of of up 

up 

to 1 metre were maintained along parts of the cut-off cut off wall. For a portion of the 

wall wall between between Ch. 1520 (MW11) and and Ch.1800 (MW14) the average water level 

elevation inside the he wall was greater than than that that outside, the opposite of of the the desired 

case case and and are shown shown as negative negative values values on Figure 4. 4. These findings are similar to 

those those of 2006, 2006, although although the average elevations for the the locations locations between between Ch. 1520 

and 1800 has increased from om on average -0.20m to -0.4m. 0.4m. This is a significant and 

critical critical length of of wall, adjacent adjacent to the river and requires requires further further investigation investigation by 

by 

Alpheus. 

Analysis Analysis of of water levels levels on a a yearly basis (not shown) indicates that the greatest 

difference in water levels vels was achieved in years 2000 and 2002. 

Conversely, Conversely, in 2001 2001 the difference difference between water water levels inside inside and and outside outside was, 

was, 

on on average, average, smallest, indicating indicating that the the desired level level difference difference was was not achieved 

achieved 

as often. 

3.3 Influent and Effluent Water Chemistry 

3.3.1 Design 



The The Pride Pride Park Water Water Treatment Treatment Plant Plant was originally originally designed designed with with the the following 

following 

water treatment components: 

1. Two Two aerated aerated balancing balancing tanks. Originally, Originally, these were designed designed to to allow 

allow 

hydrogen hydrogen peroxide dosing dosing to provide additional oxidation, but this has 

never ever been required. 

2. A A flocculation/clarification flocculation/clarification stage with with anionic anionic polyelectrolyte and ferric 

chloride chloride dosing to to remove remove dissolved metals and fine solids. solids. The 

The 

clarification clarification stage stage no no longer longer uses uses chemicals, chemicals, but the influent water is 

dosed with sulphuric aci acid d at the outlet to aid the Kaldnes process. 

3. Biological Biological nitrification nitrification in two parallel Kaldnes moving bed bed biological 

biological 

reactors (MBBRs) with coarse bubble aeration. The tanks were 

designed designed to to be be dosed with with phosphoric phosphoric acid acid to to provide provide nutrients nutrients for the 

biological al processes and sulphuric acid to control scaling of the 

medium. medium. The The Kaldnes reactors are are now now only dosed with with phosphoric 

phosphoric 

acid only. 

4. A A sand sand filter filter to remove remove suspended suspended solids solids (i.e. (i.e. sloughed biomass from 

the MBBRs). The sand filters are currently used to re remove the 

suspended suspended solids solids when when the flow from the Kaldnes reactor reactor exceeds exceeds the 

the 

consent limit 

The The plant plant was was designed for maximum maximum design loadings of of 24 kg/day kg/day biological 

oxygen oxygen demand (BOD), (BOD), 152 kg/d kg/d chemical oxygen demand (COD) (COD) and and 120 120 kg/d 

kg/d 

ammonia. Actual loadings adings have remained well below these levels.


3.3.2 Process 

The main processes occurring in the plant are: 

• Removal of solids and inorganics (including metals). 

• Biological oxidation of ammonia (NH (NH4), resulting in 

increased total oxidised nitrogen (TON). 

The early ly operation of the treatment plant was characterised by solids solids-laden, laden, ironrich 

rich groundwater. groundwater. Since Since then, then, the the main main process controlling the the operation operation of of the 

the 

plant plant has has been the the oxidation oxidation of of ammonia and balancing of TON concentrations. 

3.3.3 Ammonia 

Figures Figures 5 5 and 6 show show the the ammonia ammonia and total oxidised oxidised nitrogen nitrogen influent and 

effluent effluent concentrations. The plant has been extremely successful in reducing 

ammonia ammonia concentrations concentrations to below below the the consent limit of 3 3 mg/l mg/l (refer (refer to to Figure Figure 5). 

The operation of the plant nt is is controlled by influent ammonia concentrations concentrations and 

the bi-product product of of that that treatment process which is the effluent TON concentration. 

The aim has been to maintain influent ammonia concentrations at around 40 mg/l 

in order that effluent TON concentrations will not exceed its 40mg/l consent limit. 

This is done by balancing ammonia-rich ammonia rich water from boreholes in the younger part 

of the landfill with less ammonia ammonia-rich rich water from the older part of the landfill. 

This strategy has been successful in keeping the effluent levels of ammonia and 

TON below the consent limits over recent years, with TON having only 

marginally exceeded the consent limit twice since 2006. TON levels have 

fluctuated fluctuated around around 30mg/l 30mg/l since 2009. Although the strategy has has reduced reduced the 

the 

chemical effluent effluent levels it it may may also have have had an impact on on the the abstraction abstraction rates 

rates 

and the hydraulic gradient along the eastern wall. 

3.3.4 Metals 



Figure Figure 7 shows shows the influent iron levels are typically below the 2500ug/l consent 

levels. However, between January 2002 and January 2003, the iron levels were 

over over 1500µg/l and and peaked peaked to a maximum of 4280µg/l in in June 2002. Since Since then 

then 

iron has decreased, with one peak of 2210µg/l in 2007. 

Following Following treatment the iron effluent levels have averaged averaged approximately 300µg/l 

over the 13years, years, with lower effluent levels observed observed since 2008. 

Figure Figure 8 shows shows the results for cadmium. cadmium. Neither Neither the the influent or effluent effluent cadmium 

cadmium 

concentrations concentrations have have exceeded the consent level level during during the the operational operational life life of of the 

the 

WTP. 

Figure 9 shows the chromium levels. The consent for chromium is 65µg/l. 

Influent Influent levels levels during 2000 and and 2003 2003 were at approximately 40µg/l, 40µg/l, but but have 

have 

since since reduced reduced to less less than than 10µg/l. 10µg/l. Effluent Effluent levels levels have have typically typically remained remained below 

below 

20µg/l. 

Figure 10 shows the influent and effluent concentrations for nickel. The consent 

limit limit for for nickel nickel is is 120µg/l. There There has been been one one exceedance of of the the consent, consent, which 

which 

was was in in June 2002 2002 at 195µg/l. 195µg/l. Both Both the the influent and effluent nickel nickel concentrations 

concentrations 

typically remain below 20µg/l.


3.3.5 Suspended Solids 

Figure 11 shows the the suspended solids solids have remained remained below the 25mg/l 25mg/l consent 

limit limit with with only two exceptions, exceptions, one in 1999 1999 the other in 2000. The figure shows 

that that the the influent influent levels levels are lower lower than than the the effluent levels. levels. This This was was queried queried with 

with 

the laboratory and would appear to be correct. It is possible that the suspended 

solids are increased during the treatment process. 

3.3.6 Biological Oxygen Demand 

The The biological biological oxygen demand, demand, shown in Figure Figure 12, 12, has has similarly remained below 

the 10mg/l consent limit, with one exception in April 2003 when BOD was 

measured measured at at 27mg/l. Since 2008 the the effluent concentrations of of BOD BOD have have been 

been 

slightly higher than the influent, but remain within the consent limits. 

3.3.7 pH 

The The average average influent pH level is 7.3units 7.3units which then rises rises to to an an average average of of 8 units unit 

as as a a result result of of the the processing processing at at the the treatment treatment plant. plant. However, However, pH levels have 

remained within the 6.0 and 9.0 units consent limits. 

3.3.8 Hydrocarbons 

Figure Figure 14 presents presents the the concentrations concentrations for total hydrocarbons. Between 2000 2000 and 

and 

2002 the effluent total hydroc hydrocarbons arbons exceeded the 5mg/l consent limit. From 2002 

onwards onwards the the effluent, effluent, (and influent) influent) hydrocarbon hydrocarbon levels levels have have been been less less than than 2mg/l, 

2mg/l, 

with no further exceedances. 

3.3.9 Phenol 

Phenol Phenol concentrations concentrations have have remained low low during during the the operational operational life of the WTP 

at less than 10µg/l which is below the 30µg/l consent limit, see Figure 15. 

3.3.10 Cyanide 

Figure Figure 16 show show the the cyanide cyanide levels. levels. However, as as discussed in in Section Section 2.1 2.1 above 

above 

since since a a laboratory change in in 2006 2006 total cyanide has been measured rather than free 

cyanide. The laboratory ratory has has been been notified and will analyse analyse free cyanide from from now 

now 

on. on. From the the monthly monthly spot spot sampling sampling carried carried out out by by the the Environment Environment Agency Agency we 

we 

know know that that the the level of free free cyanide cyanide within within the effluent is is below below the the consent consent limit. 

limit. 

In recent spot sampling the leve level l of free cyanide has risen and is current just 

below below the 0.05 mg/l consent consent at around 0.04mg/l. The The EA EA reports reports from from the the past 

past 

12months are provided in Appendix B. 

3.4 Summary of the Current Groundwater 

Conditions Within The Site 



The Water Treatment Plant at Pri Pride de Park has been operational for over 13years. 

During this time the plant has treated over 3.8million cubic metres of 

groundwater, at an average rate of 9.0l/s.


The The plant plant has has largely largely been successful successful in in maintaining maintaining the effluent levels below the 

limits of the he consent. consent. The results suggest that that there has been a focus on on achieving 

achieving 

the the consent consent limits limits with with less less emphasis on maintaining maintaining the the water water levels levels along along the 

the 

wall. It has proved difficult to control the water levels along the north-eastern 

north eastern 

boundary adjacent to the the River River Derwent and this this may may be due to to inadequate 

inadequate 

pumping pumping control control in relation relation to the the discharge quality or may be due to localised 

pump inefficiency along the eastern wall. 

In In general, general, the the plant has has been successful successful in achieving the consent limits set by the 

EA EA and and in in treating treating the the high high levels levels of of ammonia. The The resulting TON levels are now 

successfully successfully controlled controlled and and are are within within consent limits. However, However, this this would be 

be 

expected as a result of reduced abstraction. 

The following table summarises the influent and effluent levels in comparison 

with the consent. 

Table 1Relationship Relationship of the Influent and Effluent levels to Consent limits 

Determinand 

Ammonia 

TON 

Iron 

Cadmium 

Chromium 

Nickel 

Sus solids 

BOD 

pH 

THC 

Phenols 

Cyanide 

*Confirmed by Results from EA testing 

Influent Effluent 

Above Below 



Below Below (more recently) 

Below Below 

Below Below 

Below Below 

Below Below 

Below Below 

Below Below 

Below Below 

Below Below 

Below Below 

Total Cn measured only 

(consent is for free Cn) 

Below* 

The The results results indicate that that only only the the influent influent ammonia ammonia is is above above the the consent consent limit limit of 

3mg/l. 3mg/l. All other determinands are are below below their their consent limits limits prior prior to to treatment treatment at 

the the WTP. WTP. It It would would therefore therefore suggest suggest that that ammonia is the the only only determined determined which 

which 

currently requires quires treatment. 

The The process process at the WTP does increase increase the levels of of certain certain contaminants, contaminants, such such as 

TON, TON, BOD, BOD, pH and and the suspended suspended solids, although these these remain below the 

consent limits prescribed by the EA. 

A review of the EA laboratory results confirms th that at the level of free cyanide is 

below the consent limit and there has been no issue with free cyanide.


4 Typical Typical Groundwater Groundwater Chemistry Across Across the 

Pride Park Site 

4.1 Abstraction Wells 

There There are are 18 18 abstraction abstraction wells wells situated situated along along the cut off off wall. wall. Their Their primary primary aim is 

maintain the water levels inside the wall below those outside the wall. 

Since Since July July 2000, 2000, samples of groundwater groundwater have been taken from individual 

abstraction abstraction wells wells and analysed for for a variety of water quality quality parameters. parameters. The 

The 

results can assist with evaluation aluation of water water quality trends with time and are 

discussed below. 

4.2 Water Chemistry Trends 



It It is not not possible possible to evaluate trends trends in Pride Park groundwater groundwater quality quality by by looking 

looking 

purely purely at at analyses analyses of of samples samples of of influent influent water water quality. quality. The The chemistry chemistry of of water 

water 

entering the WTP is determined not just by the quality of water entering 

individual individual abstraction abstraction wells wells (AW1 (AW1 to AW17, refer to Figure 1), but also by the 

amounts amounts of of water water that that individual individual boreholes contribute contribute to to the the total total flow flow rate. rate. At any 

any 

point in time this may may be affected by operational operational considerations, such such as as pump 

maintenance maintenance and and the need need to to restrict restrict discharge from boreholes boreholes with high ammonia 

concentrations in order to limit the influent ammonia load. 

Water chemistry is also monitored in abstraction wells, the wall monitoring wells, 

and in three ‘infield’ monitoring wells inside, but not adjacent to the cut cut-off off wall. 

The The sampling sampling frequency frequency of of the abstraction wells was once once every every six six months 

months 

between 2000 and 2010. Following a successful application to reduce the 

monitoring, monitoring, the the abstraction abstraction wells are now monitored on an annual basis, with the 

most most recent monitoring monitoring round round being carried out in July 2011. 2011. Since Since 2006, a total 

total 

of seven complete monitoring rounds have been carried out. 

Over the course of time four ddifferent 

ifferent laboratories have been used to analyse the 

samples. samples. Although Although laboratories laboratories may may use use the same same analysis analysis techniques and exercise 

quality quality control procedures, procedures, there there exists exists the possibility possibility that that results results from from any two 

two 

labs are not directly comparable. 

Plots of chemical concentrations versus time have been prepared for the 

abstraction abstraction wells wells and are presented at at the end of the report report (Figures (Figures 17 17 +). +). The 

The 

plots plots show ammonia, TON, TON, boron, boron, PAHs, PAHs, pH, pH, BOD and COD. These These plots plots can can be 

be 

used to both evaluate concentration changes along the cut-off off wall and trends of 

concentrations with time. 

4.3 Water Water Chemistry Chemistry by Abstraction Well Well Location 

Location 

The water chemistry along the cut cut-off off wall, AW1 to AW17, has altered over the 

past decade. During the early phase of monitoring it was clea clear r that the water 

chemistry chemistry reflected the the different different historical historical land land uses. uses. From From 2000 2000 to to 2002 2002 the 

highest highest ammonia ammonia concentrations concentrations were observed between abstraction abstraction wells wells AW12 

AW12 

to AW15 situated along the north north-eastern section of the wall.


Over more recent years rs there has been a decrease in the ammonia at these 

locations locations and since 2006 the the highest highest ammonia concentrations were measured in 

AW7 to AW9 along the south south-eastern eastern section of the wall, near the WTP. The 

highest level of ammonia to date was recently record recorded, ed, at AW7 in July 2011 at 

194mg/l. 194mg/l. The level level of ammonia ammonia has steadily steadily been increasing increasing at at AW7 AW7 since since 2008. 

2008. 

Reasons for this are not clear but may be due to the changes in ammonia 

production production across across the site, site, or changes changes in the hydrological hydrological regime regime as as a result o oof 

the 

abstraction and pumping. 

The wells, AW2 to AW4, are located along the southern section of the cut cut-off 

wall wall adjacent adjacent to part part of the the historical historical landfill that comprised comprised mainly mainly ashy ashy waste. 

waste. 

Ammonia is a by-product product of degradation of the organic matter wit within hin the domestic 

waste waste and so so ashy waste waste does does not generate as much much ammonia as as the domestic 

waste. waste. The The ammonia ammonia levels levels at at this this location location have typically typically been lower here during 

the the monitoring monitoring period than than at at other parts if the site. site. However, However, in in recent recent years years the 

the 

levels levels of of ammonia have have increased, increased, with the highest concentrations for these wells 

being being observed observed between 2009 and 2011. Ammonia concentrations at at AW4 AW4 have 

have 

risen from 22.7mg/l in 2002 to 73.7mg/l in 2010. 

The results are shown on Figure 17, which illustrate illustrates s the reduction of ammonia 

concentrations in the north-eastern 

eastern most locations, and an increase in the south southeast 

locations. 

The The lowest lowest ammonia concentrations concentrations are are observed observed at at AW1 AW1 located located to to the the south- 

south 

west of waste repository WR1. AW16 and AW17 are also ty typically low, 

averaging averaging at 6.5mg/l. These These wells are situated to the north of the main historical 

landfill area. 

4.4 Changes in Water Chemistry with Time 

4.4.1 Ammonia 

Ammonia Ammonia concentrations concentrations have reduced reduced with time in in the the abstraction abstraction wells wells located 

located 

along the north-eastern ern boundary. boundary. Conversely, there has has been an an increase in 

in 

ammonia ammonia in in the abstraction abstraction wells wells in in the the southeast, southeast, at at locations locations AW7 to to AW9, with 

levels reaching 194mg/l. 

4.4.2 Total Oxidised Nitrogen 

The levels of TON have increased with time notably along the eastern section of 

the wall between AW9 and AW16. 

4.4.3 Biological Oxygen Demand 

The The average average BOD concentration has reduced reduced from 3.24mg/l in in 2000 2000 to to 1.52mg/l 

1.52mg/l 

in in 2010, conversely the the average average level level of of TON TON has has increased increased from from 7.3 7.3 mg/l mg/l in in 2000 

2000 

reaching 37.4mg/l in 2010. 

4.4.4 Chemical mical Oxygen Demand 



The The COD COD data indicates indicates that that on on the the whole whole the the chemical chemical oxygen demand has 

increased, increased, from from an an average of 18.4mg/l 18.4mg/l in 2000 to 28.48 mg/l mg/l in in 2009. 2009. There 

There


have have been been peaks peaks and and troughs troughs within within the the average average concentrations, with with the the highest 

average concentrations concentrations recorded recorded in in July 2001. 2001. The The highest concentrations concentrations of of COD 

COD 

are typically between AW9 and AW16 along the eastern section of the cut cut-off 

wall. 

4.4.5 pH 

pH pH levels levels are are also very consistent consistent and during the entire monitoring period pH 

levels have ranged from rom 7.06 units to 7.51units. 

4.4.6 PAH 

PAH PAH levels levels have remained remained relatively relatively consistent consistent over the the monitoring monitoring period period from 

from 

2000 2000 to to 2011, 2011, although although a slight increase in levels was was recorded during during 2009. 2009. PAH 

PAH 

testing has not been consistent with the results based on the ssum 

um of 16, 6 and 4 

PAH’s. PAH’s. In In comparing comparing the sum sum of 6 6 PAH, which has been carried carried out out more more often 

often 

the greatest increase was noted in AW7, from 0.0001 to 0.384µg/l. 

4.4.7 Cyanide 

Clear Clear comparisons comparisons cannot be be drawn drawn from from the cyanide cyanide concentrations concentrations which which have 

have 

been observed ed within the the abstraction abstraction wells, due to samples being tested for for total, 

rather than free cyanide. 

4.4.8 Boron 



Boron Boron has has remained relatively relatively consistent across the site, with with a a slight slight decrease decrease in 

concentrations at abstraction wells AW15 toAW17. 

4.5 Current Average Conditions Around the Site 

In In order order to to design design changes to to the the treatment treatment process process or evaluate other potential 

treatment options, if applicable, it is necessary to define the typical water 

chemistry across the site, not only along the wall from where the majority of 

monitoring data is collected. 

For a more complete assessment of the water chemistry the groundwater 

monitoring data from WR2 has been reviewed and compared with the 

observations made at the WTP. 

The groundwater samples from the repository are colle collected cted and analysed by a 

different laboratory to the WTP samples. The chemical results are reported 

annually to the Environment Agency, reference [4]. 

The groundwater r from from around around the the Waste Waste Repository Repository 2 2 (WR2) has been been monitored 

since since May May 2002. 2002. Water Water samples samples are collected on a a quarterly basis basis for for ammoniacal 

ammoniacal 

nitrogen. nitrogen. Between 2002 2002 and 2005 ammoniacal ammoniacal nitrogen nitrogen was was typically typically highest highest at 

at 

borehole W2, with levels over 130mg/l. W2 is the northern most borehole at the 

repository and falls within the older historical landfill area. The nearest 

abstraction abstraction wells wells to W2 are AW12, AW13, AW14 and AW15. AW15. The The ammonia 

ammonia 

levels at these abstraction wells were also at a similar concentration during this 

time.


Since Since 2006, 2006, the the ammonia ammonia at at W2 W2 has declined declined slightly slightly and now typically fluctuates 

around around an average of of 110mg/l. By By comparison comparison the the ammonia observed observed in the 

nearby nearby abstraction abstraction wells wells has has also declined during this time time period, although by by a 

greater ater degree and on average fluctuate around 50mg/l. 

Over Over the the past past three three years the ammoniacal nitrogen nitrogen concentrations in in all all boreholes 

boreholes 

at at WR2 WR2 have typically typically ranged between approximately 70mg/l 70mg/l and and 140mg/l, 140mg/l, with 

with 

the highest concentrations observed in W1, north-west no west of the repository, and in 

W6 W6 and W7 to to the the south south of of the the repository. repository. The The nearest nearest abstraction abstraction wells wells to to W6 

W6 

and and W7 are AW7, AW8 which which have have also measured measured an an increase increase in in ammonia 

ammonia 

recently. 

In general, the water chemistry conditions around the waste repos repository itory show clear 

relationship relationship with with the WTP WTP data set. Similar Similar concentrations concentrations and and trends trends are are evident 

evident 

see Appendix C. 

5 Treatment Options 

The results indicate that only the influent ammonia is above the consent limit of 

3mg/l. 3mg/l. All other determinands are are below below their their consent limits limits prior prior to to treatment treatment at 

the WTP. It would therefore suggest that ammonia is the only determinant which 

currently requires treatment. Although the water quality at present requires the 

treatment treatment of ammonia ammonia (and (and its its resulting TON), the water treatment treatment plant plant was 

was 

designed to treat the various contaminants known to be present within the 

groundwater. Any changes to the treatment plant should consider tthe 

he potential 

impacts impacts created as a a result result of of proposed proposed new new developments developments within within the the site site and and how 

how 

construction construction works may “stir” up up contaminants contaminants or alter alter hydrology hydrology within within the site. 

6 Operating Costs 



Current operating costs have been calculated from the invoices ssupplied 

upplied by Derby 

City City Council. Council. The The costs costs for running running the the plant plant include include services provided by 

Alpheus Alpheus and and Siemens Siemens along along with electricity and water utilities utilities and and for for discharge 

discharge 

consent costs. 

Based on the average 2010 figures the WTP currently costs approximately approximat just 

under £200k k per year, see table below. Of those cost £28k is for the discharge 

consent fees. The consent charges are based on various factors, which include 

volume discharge per day. Current the fee calculation is based on category E3 

which is for 1,000 to 10,000m 

discharge is 2,860cubic metres per day. However, on interrogation of the 

abstraction rates it is clear the actual volume discharged is currently below the 

1,000cubic metres per day. If abstracti 

it would be recommended to negotiate a reduction in the discharge as this volume 

falls within the lower band D2. However, in the immediate future it would be 

recommended to increase abstraction rates in order 

level objective across the wall. 

3 ely just 

k per year, see table below. Of those cost £28k is for the discharge 

consent fees. The consent charges are based on various factors, which include 

volume discharge per day. Current the fee calculation is based on category E3 

/day discharge. The maximum consented total 

discharge is 2,860cubic metres per day. However, on interrogation of the 

abstraction rates it is clear the actual volume discharged is currently below the 

1,000cubic metres per day. If abstraction on rates were to continue at the current rates 

it would be recommended to negotiate a reduction in the discharge as this volume 

falls within the lower band D2. However, in the immediate future it would be 

recommended to increase abstraction rates in order to achieve the desire water 

level objective across the wall. 

It It is understood understood that that the running costs for for the WTP are covered by tenancy 

tenancy 

agreements for the site occupiers within the Pride Park site.




Table 2 Average Annual Running Costs 

Company 

Average Annual Cost 

Alpheus 

£121,000 

Environment Agency Discharge Charges £28,434 

Severn Trent 

£65 

Siemens 

£186 

SWALEC 

£34,306 

Total 

*Based on bills provided by Derby City Council 

£183,991.00


7 Conclusions 



The Water Treatment Plant Plant at at Pride Pride Park Park has has been been operational for for nearly nearly 14years. 

The The plant plant was was designed to receive an input maximum of 33 33 l/s of abstracted 

abstracted 

groundwater. groundwater. The plant has has never reached reached design capacity and is at at present 

present 

receiving less than 18% of the maximum capaci capacity. ty. Therefore, there is capacity 

within within the the plant plant to receive additional water for treatment and increased abstraction 

rates could be accommodated. 

Energy Energy consumption consumption at at the plant has decreased, although this this could could be be a a reflection 

reflection 

of the reduced pumping. With continual increased energy prices it would be 

prudent prudent to to cut cut energy energy usages usages and and make make further further costs savings where possible. The 

council council should consider consider adopting adopting alternative energy sources, sources, such such as solar solar energy, 

although the feasibility of alternative sources would need to be investigated. 

Along the south western section of the wall from MW15 south to MW7 the 

groundwater groundwater levels levels within within the wall compared compared to to those those outside outside the the wall wall revealed 

revealed 

that the water level objective was achieved in over 92% or more monitor monitoring ing 

rounds rounds Only Only one monitoring monitoring well well pair, MW3, MW3, achieved the the desired desired water water levels 

for for 100% 100% of the the time, located at at Ch. Ch. 380 in the south of of the the site. site. Figure Figure 3 3 shows 

shows 

the the percentage percentage of monitoring monitoring rounds where where the water water level level outside outside the the wall wall was 

was 

greater than the he water level inside the wall. 

The The groundwater groundwater levels levels between between MW MW 11 and MW14 MW14 on average has has produced produced the 

the 

opposite opposite of of the the desired case and and this is of concern. It It has has long long proven proven difficult difficult to 

to 

maintain the levels along this section. Alpheus report slow rech recharge arge to the wells. 

The The combination combination of reduced reduced abstraction rates and and pump pump inefficiencies inefficiencies has has resulted 

resulted 

in in high water water levels along along the eastern wall. wall. Further investigation and clarification 

from the operator is urgently required coupled with programme of maint maintenance enance 

and and redevelopment of the the wells wells along along the eastern wall. Increased Increased pumping pumping is 

is 

required in this area to achieve the desired groundwater levels. 

If If redevelopment and maintence of the wells fails to reduce reduce the the groundwater 

groundwater 

levels levels inside inside the wall sufficiently, then it may be necessary to install further 

abstraction boreholes in the area to achieve the desired water levels. 

The plant has been successf successful ul in reducing ammonia concentrations to below the 

consent consent limit limit of of 3 3 mg/l, mg/l, but but this this may may be be as as a a result of of reduced reduced pumping pumping along along the 

the 

eastern section of the wall. The operation of the plant is controlled by the 

relationship of the influent ammonia concentrations concentra and the effluent TON 

concentration. The aim has been to maintain influent ammonia concentrations at 

around 40 mg/l in order that effluent TON concentrations will not exceed the 

consent limit. This is done by balancing ammonia ammonia-rich rich water from boreholes borehole in 

the younger part of the landfill with less ammonia ammonia-rich rich water from the older part 

of the landfill. 

In In recent recent years years the the water water chemistry chemistry results results show show that that all all other other contaminants contaminants are 

are 

below the consent limit when entering the WTP, i.e. in the influent. DDuring 

uring the 

treatment treatment process certain certain determinands determinands are increased, such such as as pH pH and and suspended 

suspended 

solids, although they do remain below the consent limits in the effluent. 

The The chemical chemical results from the the abstraction abstraction wells wells have have shown that there has been a 

change in chemistry emistry over over time. The The ammonia concentrations concentrations have reduced reduced in the 

abstraction wells located along the north-eastern north eastern boundary. There has been a


noticeable increase in the ammonia concentrations to the south of the site, 

particularly in abstraction wells AW7 to AW9. Reasons for the changes in 

ammonia ammonia along along the the wall wall are not clear but may be due to the changes in in ammonia 

production production across across the site site associated associated with with the varying types types of made made ground and 

residual contamination. The abstraction and pumping over the yyears 

ears will also have 

had had an effect effect on on the hydraulic hydraulic gradient with concentration of of chemicals being 

being 

drawn drawn towards towards the WTP. WTP. The The levels of TON and COD have also also increased increased with 

with 

time, time, typically typically along the eastern eastern section of of the wall, between between AW9 AW9 and and AW16 

AW16 

along the e eastern eastern most most site boundary and BOD has reduced. PAH, Boron and and pH 

have have remained remained relatively relatively consistent consistent during the past 13 years monitoring period 

Water Water chemistry data from from the monitoring monitoring location around around the the nearby nearby waste 

waste 

repository have been reviewed and compared with the WTP data. Comparison of 

the the water water treatment treatment water water quality quality datasets datasets with with the the Waste Repository Repository 2 water 

water 

quality records show very clear relationship and very similar trends and 

concentrations observed. 

The plant is successful in meeting the limits set in the discharge consent. 

A separate report is being prepared for the Condition survey. 

7.1 Recommendations 



The The future future operations operations at at the the plant plant need to continue to to monitor monitor and and maintain maintain the 

water levels along the wall with increased attention needed in the eastern area. 

Alpheus Alpheus are are urgently required required to investigate the performance of of the abstraction 

wells along the eastern wall, and carry out a programme of ma maintenance intenance and/ or 

redevelopment redevelopment to ensure sufficient sufficient quantities quantities of groundwater can can be be abstracted 

abstracted 

from from this critical area. area. Installation of further abstraction abstraction wells wells may may be be required if 

if 

the desired water levels still cannot be achieved following these 

recommendations.




References


[1] Arup, WTP Condition Study Report 2011 

[2] Arup Report, Water Treatment Data Review, 2006; 

[3] Arup Report, Pride Park Reclamation Exit Strategy, 2003; and 

[4] Arup Report, WR2 Annual Monitoring Report, 2011. 



Figures




Appendix A 

Changes in Monitoring 

Frequencies Between 1998 and 

2011


A1 Monitoring Frequencies 

The following changes to consent [T/48/45190/T] as authorised by the 

Environment Agency have taken place: 

MAY 2006 

Effluent: 

On-site monitoring 

Flow 

Ammoniacal nitrogen 

pH 

Turbidity 

Dissolved oxygen 

Total carbon 

Total organic carbon 

Effluent: 

Proposed monthly off-site site monitoring 

COD 

Ammoniacal Nitrogen 

TON 

Total hydrocarbons 

Free cyanide 

Effluent: 

Proposed quarterly off-site site monitoring 

pH 

Sulphate 

Tot Hardness (CaCO3) 

Chloride 

Al 

As 

Cr 

Fe 

Pb 

Ni 

Cu 

Zn 

Boron 

Cd 

Hg 

Pentachlorophenol 

Phenols 

Tot Sus Sol 

Orthophosphate-P 

BOD (5) 

PAHs (6) 



Current frequency Proposed 

frequency 

Continuous on-line monitoring No change 


frequency 

Weekly 

Monthly 


frequency 

Quarterly 6-Monthly Monthly 

Quarterly Quarterly


Influent: 


Flow 


pH 

Conductivity 

Total Carbon 

Kaldnes Dissolved Oxygen 

Influent: 

Proposed weekly off-site site monitoring 

COD 


TON 

Total hydrocarbons 

Influent: 

Proposed quarterly off-site site monitoring 

pH 

Sulphate 

Total Hardness (CaCO3) 

Chloride 

Free Cyanide 

Al, As, Cr, Fe, Pb, Ni, Cu, Zn, Boron 

Cd, Hg 

Pentachlorophenol, Phenols 

Total Suspended Solids 

Orthophosphate-P 

BOD (5) 

March 2009 

Monitoring 


(dataloggers) 

influent and effluent streams 

Off-site monitoring 



effluent stream 



Radioactivity 

Influent stream 


Effluent stream 




frequency 

Continuous on-line monitoring No change 


frequency 

Weekly Monthly 


frequency 

Quarterly 6-Monthly Monthly 

Current Frequency Proposed Frequency 

Continuous monitoring Continuous monitoring 

Monthly Quarterly 

Quarterly 6- monthly 

6-monthly Annual 

Annual Annual 

Annual Annual




Appendix B 

EA Spot Sampling Records

Appendix C 

Extract from WR2 Annual 

Monitoring Report 2010

Derby City Council Pride Park Water Treatment Plant Data Review ...

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