Groundwater Monitoring Report

Transcription

1 Groundwater Monitoring Report Briefing Note 5 SC C Volume 1 of 1 Final Scottish Executive BRIEFING5_FINALJR Enviros Aspinwall, 61 The Shore, Leith, Edinburgh. EH6 6RA

2 Scottish Executive Groundwater Monitoring Report Quality Control Sheet Publication title: CAN: Groundwater Monitoring Report SC c Volume number: Volume 1 of 1 Version Final Date: File Reference: Briefing5 Prepared under the management of: Signature Diarmid Jamieson Project Manager Directed, reviewed and approved by: Signature John Ferry Project Director Aspinwall & Company Limited 2002, trading as Enviros Aspinwall

3 Scottish Executive Groundwater Monitoring Report Contents Chapter Page Executive Summary 1 1 Introduction 2 2 Monitoring Results 4 3 Conclusions and Recommendations 10 Illustrations Figure 1 : Site Location Figure 2 : Site Plan Appendix 1 Results Tables 2 Results Charts

4 Scottish Executive Groundwater Monitoring Report Executive Summary This report provides and interprets results from the ongoing groundwater monitoring programme being undertaken at Birkshaw Forest, and reviews and updates the trends within the data obtained from monitoring visits made during 30 th October to 12 th December Monitoring visits were undertaken on a fortnightly basis. Restorative earthworks at the site are nearing completion and all burial pits have now been capped. Restoration of the clay extraction pit is currently under way and all earthworks are close to completion. Results continue to show no evidence of contamination in any of the boreholes to the west, north or south of the site. Results from November and December confirm that the level of contamination has continued to reduce considerably at BHA. This suggests that the contamination around BHA from the liquor storage/treatment tanks spill has moved down gradient and is naturally attenuating. The lack of contamination in BH9, located down gradient of BHA, suggests that the contamination may have attenuated. The groundwater conditions at BH9 will continue to be closely monitored to ensure this is the case. The determinants in BHK to the south east of the site have continued to stabilise over November and December, but slight elevation in TOC and COD levels and low ph suggest that the borehole is still affected by residual disinfectant from the wheelwashing activities. BH10, to the east of Pit 6 and beyond the bund, continues to show signs of liquor contamination in the groundwater. This borehole has also shown elevated levels of CH 4 and CO 2 during the last monitoring event. However, this contamination seems to have passed its peak which appears to have been reached at the end of October. SEPA Surface water monitoring continues to show no evidence of contamination from leachate contamination or groundwater infiltration. However, suspended solids from run off resulting from site remedial capping works during heavy rain caused concern during October and November. This issue is now under control. Recommendations and actions resulting from this monitoring period are: Substantial change is recommended to the monitoring regime (in terms of frequency, borehole coverage and analytical suite) giving significant monitoring cost reductions. Enviros have agreed a location for a further borehole to monitor any lateral movement and attenuation of the contaminants identified at BH10 with the landowner and drilling is being resourced. The borehole should be installed by February, along with the repair of boreholes damaged by the restoration work. On site earthworks are close to completion. Restorative planting should be carried out in early spring. Approval will be sought from SEPA for the proposed change in monitoring programme. Enviros Aspinwall 1

5 Introduction 1 Introduction This report provides and interprets results from the ongoing groundwater monitoring programme being undertaken at Birkshaw Forest. Results up to the 16 th October are reported in the following documents, which should be referred to for background information:! Groundwater Monitoring Report end May 2001, Enviros Aspinwall, May 2001;! Letter Report, Birkshaw Forest, Lockerbie - Monitoring Briefing 2, June 2001;! Groundwater Monitoring Report Monitoring Briefing Note 3 to 3 rd August 2001, August 2001; and! Groundwater Monitoring Report Briefing Note 4, October This report reviews the additional results obtained from monitoring visits made from 30 th October to 12 th December Borehole Monitoring The following boreholes have been monitored on a fortnightly basis since the 18 th September 2001 (see Figure 2 for locations): BHA, BHG, BHJ, BHK, BH1, BH2, BH3, BH5, BH6, BH7, BH8, BH9, BH10. BH3 was not sampled on the last two visits because it was under approximately 1m of water and BH 4 has been absent since the 3 rd October due to the restoration works being undertaken at the site. BH8 was not monitored for gas on the 27 th November, as it was completely full of water. All of these issues have been the unavoidable consequence of weather conditions encountered during October and the earthworks undertaken to restore the site. Liquor Monitoring Liquor monitoring continues to be carried out on a monthly basis by Rentokil. Briefing Note 4 reported that the volume of leachate being generated on site for removal was decreasing. This trend has continued throughout the current monitoring period. The report also noted that the leachate quality was improving with significantly reduced mean COD levels. This trend has not continued, with COD levels, although remaining generally reduced, fluctuating over the period September to December. Ammoniacal Nitrogen remains a significant contaminant with levels fluctuating to peaks of between 2739 mg/l (Pit 7 14/12/01) and 5080 mg/l (Pit 9a 02/08/01). It is Enviros Aspinwall 2

6 Introduction continued 1 considered therefore, in line with the BPEO assessment, that the current disposal route for effluent remains the most appropriate at this time. Site Conditions All of the eight pits excavated on the site have now been fully capped and the clay extraction area is being restored. It is anticipated that all restoration related earthworks will be completed by the end of. In addition to this, landscaping in the form of planting will be carried out at the site in the spring. It is anticipated that the cessation of earthworks and establishment of grass cover at the site will remove any future issues with surface water contamination with suspended solids. Enviros Aspinwall 3

7 Monitoring Results 2 North West Boreholes BHG The water from this borehole continues to have a very low alkalinity (with a small peak on the 29 th November), low electrical conductivity, low ph (5-6), low BOD, low phosphate and very low nitrate. The COD and BOD levels have also remained relatively low throughout November and December. The levels of suspended solids have stayed low since the significant drop at the end of August. The water quality at this borehole is considered to be relatively uncontaminated. BH1 This water continues to exhibit a mostly neutral ph, low conductivity and low alkalinity. Both BOD and suspended solids continue to be very low, with BOD levels peaking at above 28mg/l on 13 th November. The COD has remained relatively low after its initial peak value of 168 mg/l (17/08/01). The nitrogen content of this water is low, as are the results for all other determinants. Consequently, the water quality within this borehole continues to be considered relatively uncontaminated. BH2 BH 2 continues to show no indication of significant contamination. The water has a neutral ph, low alkalinity, low conductivity and no significant nitrogen concentration. BOD remains very low and COD also continues to be relatively low, showing a reduction from an initial peak value of 161 mg/l (15/08/01). BH3 The groundwater at this borehole has maintained a very low alkalinity, a ph of around 6.0 and a low conductivity. Both BOD and suspended solids are very low. COD continues to be relatively low, recording a peak of 36 mg/l on 14 th November. Nitrogen determinants are low with a slight peak of ammonia (0.6mg/l on 06/10/01) which subsequently fell. All other determinants continue to show low levels. Consequently, the water quality within this borehole is considered to be relatively uncontaminated. North West Boreholes Summary In summary, as recorded in Briefing Note 4 none of the boreholes to the north west of the site show any evidence of contamination with liquor from the burial pits or any other substance. North East Boreholes BH5 BH 5 exhibits a very low alkalinity, mostly neutral ph, low conductivity and very low BOD and COD. Suspended solids have remained low throughout November and December. Nitrogen levels continue to be low and not considered significant. Iron concentrations have decreased further throughout this monitoring period reaching a low of 0.42 on 12 th December. The water quality within this borehole remains largely uncontaminated. BH6 The groundwater in this borehole retains a low alkalinity, low conductivity and very low BOD. The ph has remained mostly neutral throughout this monitoring period. COD also remains relatively low and has not passed its peak of 43 mg/l attained on Enviros Aspinwall 4

8 Monitoring Results continued 2 the 22 nd August. Iron concentrations continued to decrease (min. 0.8mg/l 30/10/01). Suspended solids are low, and there are no significant concentrations noted for the remaining determinants. The water quality within this borehole continues to be considered relatively uncontaminated. BH7 Samples collected from this location indicate a low alkalinity, low conductivity and very low BOD. COD levels are mildly elevated peaking at 51 mg/l on 27 th November. The ph fluctuated just above neutral throughout November and December ( ). The suspended solids and iron levels have remained low during this monitoring period. All other determinants are also low. The water quality within this borehole continues to be considered relatively uncontaminated. BH8 The water in BH8 has a moderately low conductivity (which has fluctuated between 320uS and 1300uS since monitoring began) and alkalinity. The BOD is very low and COD is mildly elevated, with the latter showing a peak value of 64 mg/l on the 27 th November. The ph continues to fluctuate just above neutral ( ), whilst the suspended solids increased slightly to around 640mg/l on 12 December. All other determinants are low. The water quality within this borehole is considered to remain uncontaminated with leachate from the burial pits. North East Boreholes Summary In summary, as reported in previous Briefing Notes none of the boreholes to the north east of the site show evidence of contamination with liquor from the burial pits. Eastern Boreholes BHA The results for the main determinants in the analytical suite have remained relatively low throughout November and December. Having dropped from around 2330uS (20/9/01) to below 500uS in the first half of October, the conductivity remained below this level throughout this monitoring period. BOD has fallen to below 20 mg/l throughout November rising to 100 mg/l on the 27 th November. COD was at its lowest since monitoring began on the 11 th October but has since risen to 513 mg/l on 27 th December (this is still substantially below the levels recorded earlier in the year). Organic carbon, nitrogen and alkalinity have all remained significantly reduced during November. Levels of suspended solids have remained low during much of this monitoring period; however, they have risen slightly to 2970mg/l on 27 th November. The ph is remaining mostly neutral and iron concentrations although generally low peaked at 112 mg/l on the 27 th November. Thus, whilst there remains evidence of contamination at this location, it is clear that the major reduction in contamination has been maintained. BH9 The groundwater in this borehole continues to be of a low conductivity and low alkalinity. The ph is fairly steady and has remained just below neutral (ph range ) since the 31 st October. BOD levels have remained low throughout this monitoring period peaking at 21mg/l (27/11/01), COD and TOC levels have also remained relatively low peaking at 55 mg/l (31/10/01) and 17.2 mg/l (27 th November) Enviros Aspinwall 5

9 Monitoring Results continued 2 respectively. All other determinants continue to be low. As such, it is considered that there is no significant contamination present at this borehole. BH10 BH10 is located to the east of Pit 6 beyond the containment bund put in place to prevent continued migration of leachate from the unlined Pit 5. Since monitoring began at this location water in this borehole characteristically has a slightly higher BOD, COD and TOC in comparison to all other monitored boreholes, with the exception of pre-october levels at BHA. Subsequent to their initial strong increase BOD levels have decreased somewhat to over 289mg/l on 12 th December. The COD levels have subsided throughout November to reach 267 mg/l (12/12/01), a level which is slightly higher than that recorded at this location at the end of August. The TOC levels have also subsided from their peak of mg/l (16/10/01) to mg/l (12/12/01). Alkalinity has continued to rise fairly steadily throughout November and December and has been higher than all the other monitored boreholes over this period reaching a peak of mg/l (as CaCO 3 ) on 12 th December. ph has remained fairly constant at around 6.5. Iron concentrations have also continued to rise throughout the monitoring period, with a maximum value of 30.9 mg/l (12/12/01). Eastern Boreholes Summary The reduction in contamination seen at BHA during October has been sustained throughout November. The groundwater at this location is no longer considered significantly contaminated. BH9 located to the south of BHA and down gradient continues to show no evidence of significant contamination. There is evidence that, the contaminant levels in BH10 have passed their peak and that there is now some evidence of attenuation. It should be noted that, although elevated, the contaminant levels at this location have not reached the peak levels observed in BHA. Southern Boreholes BHJ There have been no significant changes in the condition of the groundwater at this location. The groundwater continues to show low conductivity and alkalinity. The ph has remained mostly neutral, whilst the BOD and COD are consistently very low when compared with the other boreholes on site. The nitrogen concentrations are considered to be at insignificant levels, and the organic carbon has continued to be low. Levels of suspended solids have remained low with a small peak of 1120 mg/l on the 14 th November. Consequently, this borehole continues to show no evidence of contamination. BHK The conductivity and BOD levels at this location continue to be very low. The COD levels continue to fluctuate and, although they have been slightly lower recently (67 mg/l 12/12/01), they have been generally higher than most other locations (excluding BH10 and BHA until recently). Organic carbon levels have subsided from their moderate peak at the beginning of October (69.8 mg/l 16/10/01) to 26.7mg/l on the 12 th December. The alkalinity of the water continues to be very low. The ph retains a slightly acidic character, with results ranging from during November Enviros Aspinwall 6

10 Monitoring Results continued 2 and December. All other determinants are low, apart from a relatively high iron values ranging from 1.96 mg/l (14/11/01) to 30.2 mg/l (31/10/01). This borehole continues to show slightly elevated results for COD and a low ph. This may indicate some level of contamination with wheelwash remains at this location. Southern Boreholes Summary As recorded in Briefing Note 4, BHJ continues to show no signs of contamination. Contaminant levels in BHK continue to fluctuate suggesting there may be some continued remnant contamination with liquid from the early wheelwashing operations. Water Levels Water levels in most boreholes have been generally stable with a possible slight increase in November and December. BHK showed a slight peak in water levels on the 16 th October but levels have receded slightly since then. Water levels in BHA have also increased since October with the peak level being recorded on the 4 th October. SEPA Surface Water Monitoring Briefing Note 4 reported on SEPA s surface water monitoring results up to the 12 th September. We have now obtained results up to the 21 st November All of the ditches sampled have contained sufficient water for testing throughout October and November. The results for all locations monitored show that the surface water around Birkshaw is uncontaminated. Bengall Burn -The Bengall Burn continues to have low conductivity, COD, TOC and BOD levels. Suspended solids have also remained below 205mg/l throughout October and November. The ph levels are generally neutral having fluctuated between 6.87 and 8.18 during this monitoring period. NE Ditch - The NE Ditch also continues to have low conductivity, alkalinity, COD, TOC and BOD levels. Suspended solids have remained below 400 mg/l (peak levels 398 mg/l 24/10/01). The ph levels at this location are somewhat acidic ranging between 5.88 and N Ditch - The N Ditch also shows no signs of contamination from ground water. The water characteristically has low conductivity, alkalinity, COD, TOC and BOD levels. Suspended solids have remained below 252 mg/l (21/11/01). The ph levels at this location are generally neutral ranging from 6.52 to S Ditch - The S Ditch has shown no evidence of contamination, except on the 24 th October. This sample recorded high TOC (595.9 mg/l), COD (7070 mg/l) and suspended solids (9573 mg/l), elevated levels of a number of heavy metals pb, cu Enviros Aspinwall 7

11 Monitoring Results continued 2 and zn and cr. The results are back to the usual low levels by the next monitoring visit on the 30 th October. Levels of nitrogenous compounds remain low throughout the monitoring period. Review of this sample result by Enviros indicates that the characteristics of the elevated sample do not appear to be consistent with the liquor contamination observed elsewhere on site. It would appear more likely that these results are linked to the fact that the sample contains 9,537 mg/l of suspended solids ie a substantial quantity of suspended material (probably soil). This is sufficient to interfere with the results. For example, the COD test (7,070 mg/l) is a destructive test which aggressively chemically degrades organic material and would report the organic fraction of the soil material and the water. However,since the soil material is not readily and quickly biodegradable by micro-organisms used in the less aggressive BOD test, the BOD test records less than 20 mg/l. Normally a high BOD test result would accompany a high COD test result, one could expect a BOD of 2000mg/l or more if the COD test was accurate. It is also likely that the elevated metals concentrations measured, albeit still in microgram quantities, also reflect interference from the soil material rather than accurately portray the ditch waters. SEPA confirm that the sample was unfiltered and taken at a time when surface run-off was an issue at the site. River Annan - The results from water sampling of the River Annan both above and below the site are very similar in character and both show no signs of contamination. Both locations displayed low conductivity (max 180mg/l), COD (max 42mg/l), BOD (max 2.6 mg/l), TOC (max 12 mg/l) and suspended solids (16mg/l). Surface Water Summary Surface water monitoring carried out by SEPA up to the 21 st November has shown no evidence of contamination by site liquors or leachate. The S Ditch showed evidence of contamination with surface runoff on the 24 th October. However, the problems with surface water run off on the site, caused by heavy rain and earthworks related to capping of the pits, have been resolved through the following remedial works. construction of blind french drains running the length of the south side and 200m along the east from the SE corner, along the east side of the site and on the north side utilising the existing open ditches; installation of staged attenuation ponds in the north and south of the site (as described in Briefing Note 4); and continuous chemical treatment of the water within the attenuation ponds. As suggested in the previous Briefing Note the water within the pools is being chemically treated to stop colloidal suspensions forming in the water. The water is Enviros Aspinwall 8

12 Monitoring Results continued 2 being treated with a continuous application of CIBA Speciality Chemicals anionic and cationic flocculent (AN2 and CN2) using the method approved with SEPA. These flocculents bring the suspended solids out of suspension so that the water leaving the pools is significantly clearer. Gas Monitoring Most of the old and new boreholes continue to show gas concentrations at atmospheric conditions. Boreholes BHK, BH9 and BHA have all shown depleted O 2 or elevated CO 2 and CH 4 levels at some point since monitoring began but are now returning to normal. However, BH10 has shown significantly elevated CH 4 levels within this monitoring period. BHK continues to show slightly elevated CO 2 and depleted O 2 continue. However, on the majority of recent visits (3 of the last 5) gas concentrations have been at atmospheric levels. BH9 has previously shown very depleted O 2 (with 0% O 2 recorded the first two weeks) and elevated CO 2 levels (rising to a peak of 16% on the 22 nd August). CH 4 levels have fluctuated between 0.1% and 0.5%. However, since the 31 st October gas concentrations have improved markedly to around 20% O 2 and less than 3% CO 2 and 0.2% CH 4 (normal atmospheric conditions). BHA also showed elevated levels of O 2 which have returned to atmospheric levels within this monitoring period. However, BH10 was showing depleted O 2 levels (14.9%) and elevated CO 2 (5.2%) and CH 4 (7%) levels on the last monitoring visit (12/12/01). At these levels active gas management is not required and the exposed nature of the site considerably reduces the risk of explosion or asphyxiation from this gas. Enviros Aspinwall 9

13 Conclusions and Recommendations 3 Conclusions There continues to be no evidence of liquor breakout to the north west or south of the site and the surface waters monitored by SEPA also show no signs of contamination with liquor. The water quality in BHK to the south east of the site have continued to stabilise over November and December, but TOC and COD levels remain slightly elevated and the ph remains low, suggesting that the borehole is still affected by residual disinfectant from the wheelwashing activities. BHA to the south east of pit 6 shows continued evidence of a reduction in contamination. BH9 which is located below BHA also shows no apparent evidence of contamination. This suggests that the contamination around BHA relating to a spill from the liquor storage/treatment tanks is no longer a significant problem at this location. However, groundwater conditions at BH9 will be monitored closely to detect any evidence for down gradient attenuation. BH8 located to the north of Pit 6 continues to show no evidence of contamination thus demonstrating the integrity of the clay bund installed to prevent the migration of breakout northwards from Pit 5. BH10, to the east of Pit 6 and beyond the bund, continues to show signs of liquor contamination in the groundwater. However, this contamination seems to have passed its peak which appears to have been reached at the end of October. This borehole has also shown elevated levels of CH 4 and CO 2 during the last monitoring event. As proposed in the previous Briefing Note, it has been agreed that a further borehole will be installed to monitor any lateral movement and attenuation of the contaminants identified at BH10. Proposed Change to Monitoring Programme Number of Boreholes and Frequency of Monitoring A significant change to the monitoring regime at the site is recommended. This change would comprise: A discontinuation of fortnightly monitoring for all but one indicator borehole in each of the northern, southern and western areas of the site. Continued fortnightly monitoring of all boreholes to the east of the site. A decrease to monthly monitoring for all boreholes in May if monitoring results allow. Quarterly monitoring of all boreholes on site. Enviros Aspinwall 10

14 Conclusions and Recommendations continued 3 The proposed change is due to the stable and relatively uncontaminated nature of the groundwater to the north, south and west of the site and the continued evidence of contamination to the east. The proposed monitoring regime is as follows: Boreholes to be monitored fortnightly: BHA, BHJ, BHK, BH2, BH8, BH9, BH10 Boreholes to be monitored quarterly: BHA, BHG, BHJ, BHK, BH1, BH2, BH3, BH5, BH6, BH7, BH8, BH9, BH10 A consequence of reducing the monitoring frequency for the majority of boreholes to the north of the site is that less time (one day) will be required to carry out the monitoring in all but the last monitoring event of each quarter. Change to Analytical Suite It is proposed that the analytical suite is also reduced. The analyses to be discontinued are: Alkalinity to ph 4.5 (as HCO3) as it is no longer necessary to test for alkalinity using two alternative methods. It is proposed that the test using CaCO 3 is applied in future. Nirate and Nitrite as oxidised nitrogen has not been a significant indicator of liquor contamination. The test for Total Oxidised Nitrogen would be retained. Kjeldhal and Total Nitrogen with the test for Ammoniacal Nitrogen retained as the key indicator. Phosphorus, iron and arsenic as they also do not appear to be useful indicators. Enviros Aspinwall 11

15 Conclusions and Recommendations continued 3 The following table shows the proposed changes to the analytical suite: Analytical Suite Current Suite Proposed Suite 5 day Soluble BOD (ATU) # # COD (soluble) # # Organic Carbon after Filtration (TOC) # # ph # # Alkalinity to ph 4.5 (as CaCO3) filtered # # Alkalinity to ph 4.5 (as HCO3) filtered # Total Nitrogen (as N) # Kjeldhal Nitrogen Equivalent # Ammonia (as N) filtered # # Total Oxidised Nitrogen (as N) filtered # # Nitrite (as N) filtered # Nitrate (as N) filtered # Conductivity at 20 deg C # # Suspended Solids # # Potassium (filtered) # # Chloride # # Phosphate soluble reactive (as P) # Arsenic (dissolved) # Iron (dissolved) # Further Action and Recommendations Current recommendations and actions following the results of the last monitoring period are summarised below: Fortnightly monitoring visits (reducing to monthly monitoring in May) discontinued for all boreholes except those to the east of the site and the 3 indicator boreholes in the north east, north west and south ie BHA, BHJ, BHK, BH2, BH8, BH9, BH10. Quarterly sampling from all boreholes to provide complete coverage. The analytical suite will be reduced to provide the most cost effective monitoring system. The following tests will be discontinued: Alkalinity to ph 4.5 (as HCO 3 ), Kjeldhal and Total Nitrogen, Nitrate, Nitrite, TOC, Phosphorus, Iron and Arsenic. Enviros Aspinwall 12

16 Conclusions and Recommendations continued 3 The following tests will be retained: BOD, COD, ph, Alkalinity to ph 4.5 (as CaCO 3 ), Ammonia, TON, Conductivity, Suspended Solids, Chloride, Potassium. As proposed in the previous Briefing Note, it has been agreed that a further borehole will be installed to monitor any lateral movement and attenuation of the contaminants identified at BH10. Enviros have agreed a location with the landowner and drilling is being resourced. The borehole should be installed by February. On site earthworks should be completed by the end of January. Restorative planting should be carried out in early spring. All boreholes damaged by the restoration work will be repaired during the installation of the new borehole above. Approval will be sought from SEPA for the proposed change in monitoring programme. Enviros Aspinwall 13

17 Scottish Executive Groundwater Monitoring Report Figures Enviros Aspinwall

18 Scottish Executive Groundwater Monitoring Report Figure 1 : Site Location Enviros Aspinwall

19 Scottish Executive Groundwater Monitoring Report Figure 2 : Site Plan Enviros Aspinwall

20 Scottish Executive Groundwater Monitoring Report Appendices Enviros Aspinwall

21 Scottish Executive Groundwater Monitoring Report Appendix Results Tables 1 Groundwater & Well Head Monitoring BHA: 3 May 12 December Groundwater & Well Head Monitoring BHG: 3 May 12 December Groundwater & Well Head Monitoring BHJ: 3 May 12 December Groundwater & Well Head Monitoring BHK: 3 May 12 December Groundwater & Well Head Monitoring BH1: 3 May 12 December Groundwater & Well Head Monitoring BH2: 3 May 12 December Groundwater & Well Head Monitoring BH3: 3 May 12 December Groundwater & Well Head Monitoring BH4: 3 May 12 December Groundwater & Well Head Monitoring BH5: 3 May 12 December Groundwater & Well Head Monitoring BH6: 3 May 12 December Groundwater & Well Head Monitoring BH7: 3 May 12 December Groundwater & Well Head Monitoring BH8: 3 May 12 December Groundwater & Well Head Monitoring BH9: 3 May 12 December Groundwater & Well Head Monitoring BH10: 3 May 12 December Gas Monitoring Results: Leachate Monitoring Results: 23 May 12 December 6 July 14 December Enviros Aspinwall

22 Scottish Executive Groundwater Monitoring Report Appendix Results Charts 2 Chart 1: Chart 2: Chart 3: Chart 4: Chart 5: Chart 6: Chart 7: Chart 8: Chart 9: Chart 10: Chart 11: Chart 12: Chart 13: Chart 14: Electrical Conductivity COD (with BHA) COD (without BHA) BOD (with BHA) BOD (without BHA) TOC (with BHA) TOC (without BHA) Ammoniacal Nitrogen (with BHA) Ammoniacal Nitrogen (without BHA) Kjeldahl Nitrogen (with BHA) Kjeldahl Nitrogen (without BHA) ph Alkalinity Iron Water Level Potassium Chloride Total Oxidised Nitrogen Suspended Solids Enviros Aspinwall