Combined Sewer Overflows July 2012-December 2013

Transcription

1 CSO Facilities Summary Report 213 Combined Sewer Overflows July 212-December 213 Overview MWRA monitored four CSO facilities in the North System during the period covered in this report (July 212 December 213). Three of the facilities Cottage Farm, Prison Point, and Somerville Marginal are covered by the same NPDES permit as DITP. The fourth facility is the Union Park CSO facility, located in Boston and discharging to the Fort Point Channel. Union Park operates under a different NPDES permit than the other CSO facilities. There are no CSO facilities in the South System. Three CSO facilities in the North System have been closed following sewer separation projects. In November 27, the Fox Point and Commercial Point facilities were decommissioned and no longer discharge due to the completion of a separation project in the Dorchester area. The Constitution Beach facility was deactivated in September 2. The monitoring results vary significantly between facilities because of differences in type and location. Location is especially important since storms can be highly localized, affecting the level and intensity of rainfall at the CSO facility and the area that the facility serves. Improvements to the transport system (such as sewer separation projects) and the CSO facilities themselves have improved the capture of combined sewage. This has resulted in fewer s over time. Each CSO facility screens, chlorinates, and dechlorinates combined wastewater (sewage and storm water) prior to discharge. The Cottage Farm, Prison Point, and Union Park facilities also have pumping and tank storage capacity. Pumping and tank storage allows screened and chlorinated wastewater to be held at these facilities up to their storage capacities prior to discharge. Stored wastewater can eventually be pumped back into the system and processed at Deer Island. Any wastewater exceeding the storage capacity will overflow and discharge through the CSO outfalls. All of this discharge is disinfected. The remaining CSO facility Somerville Marginal is a gravity CSO facility, meaning that combined wastewater both arrives and leaves the CSO facility by gravity instead of pumping. The disinfected wastewater overflows to the receiving water as quickly as it arrives at the facility. All rainfall data in the following sections is from Logan Airport. 1

2 Number of s Annual rainfall (inches) Activations Total volume treated Min Mean Max Total rainfall (inches) CSO Facilities Summary Report 213 Cottage Farm CSO Facility Table 1 and Figures 1 and 2 summarize data for the Cottage Farm CSO facility. Table 1. Cottage Farm CSO Activations Summary, CY CY CY CY CY CY CY CY CY CY CY CY CY CY Average = Total volume treated divided by the number of s CY CY1 CY2 CY3 CY4 CY5 CY6 CY7 CY8 CY9 CY1 CY11 CY12 CY13 1 Activations Annual rainfall Figure 1. Cottage Farm CSO Activations Compared to Precipitation,

3 Volume treated Annual rainfall (inches) CSO Facilities Summary Report CY CY1 CY2 CY3 CY4 CY5 CY6 CY7 CY8 CY9 CY1 CY11 CY12 CY13 Volume treated Annual rainfall Figure 2. Cottage Farm CSO Volume Treated Compared to Precipitation, Table A-1 of Appendix A contains detailed data on conventional parameters in Cottage Farm effluent. Table 2 below summarizes this data. As is the case with all four facilities covered in this summary, Cottage Farm is a CSO facility that provides floatables control, chlorination, and dechlorination. Such a facility cannot provide the same level of effluent treatment as a full-fledged treatment plant such as Deer Island. CSO effluent ph is often rather low in comparison to effluent from Deer Island or other treatment plants as CSO facilities cannot correct for sewage and/or stormwater that enters the facility with an already low ph. Table 2. Cottage Farm CSO Effluent Characterization, July 212 December 213 Parameter Minimum Average Maximum TSS (mg/l) BOD (mg/l) Fecal Coliform (col/1 ml) ph (SU)

4 CSO Facilities Summary Report 213 MWRA also tests CSO effluent for metals and surfactants whenever the CSO facility is sampled. The results of these tests are presented in Appendix A, Tables A-2 and A-3. The target metals were detected in most samples, as seen in Table 3. Table 3. Cottage Farm CSO Effluent Metals, July 212 December 213 Parameter Average Concentration Detected Aluminum (ug/l) of 4 Cadmium (ug/l).51 4 of 7 Calcium (ug/l) of 4 Chromium (ug/l) of 4 Copper (ug/l) of 4 Lead (ug/l) of 5 Magnesium (ug/l) of 4 Mercury (ug/l).31 4 of 4 Nickel (ug/l) of 5 Silver (ug/l).35 1 of 1 Zinc (ug/l) of 4 4

5 Number of s Annual rainfall (inches) Activations Total volume treated Min Mean Max Total rainfall (inches) CSO Facilities Summary Report 213 Prison Point CSO Facility Activation data for the Prison Point CSO facility are summarized in Table 4 and Figures 3 and 4. Unlike the Cottage Farm facility, Prison Point is not hydraulically connected to the Deer Island Treatment Plant, so s are primarily dependent on rainfall. Table 2. Prison Point CSO Activations Summary CY CY CY CY CY CY CY CY CY CY CY CY CY CY Average = Total volume treated divided by the number of s CY CY1 CY2 CY3 CY4 CY5 CY6 CY7 CY8 CY9 CY1 CY11 CY12 CY Activations Annual rainfall Figure 3. Prison Point CSO Activation Compared to Precipitation,

6 Volume treated Annual rainfall (inches) CSO Facilities Summary Report CY CY1 CY2 CY3 CY4 CY5 CY6 CY7 CY8 CY9 CY1 CY11 CY12 CY13 Volume treated Annual rainfall Figure 4. Prison Point CSO Volume Treated Compared to Precipitation, Conventional parameter data for Prison Point effluent are provided in Appendix B, Tables B-1 and B-2. Table 5 summarizes that data. Table 3. Prison Point CSO Effluent Characteristics, July 212 December 213 Parameter Minimum Average Maximum TSS (mg/l) BOD (mg/l) Fecal Coliform (col/1 ml) ph (SU) The results of priority pollutant testing for Prison Point can be found in Tables B-2 and B-3 of Appendix B. As with Cottage Farm, the target metals were detected in most of the samples. Table 6 summarizes average metals concentrations in Prison Point effluent in the July 212 December 213 time period. Table 4. Prison Point CSO Effluent Metals, July 212 December 213 Parameter Average Concentration Detected Aluminum (ug/l) of 4 Cadmium (ug/l).47 4 of 4 Chromium (ug/l) of 4 Copper (ug/l) of 4 Lead (ug/l) of 4 Magnesium (ug/l) of 4 Mercury (ug/l).13 4 of 4 Nickel (ug/l) of 6 Zinc (ug/l) of 4 6

7 Number of s Annual rainfall (inches) Activations Total volume treated Min Mean Max Total rainfall (inches) CSO Facilities Summary Report 213 Somerville Marginal CSO Facility Table 7 and Figures 5 and 6 summarize information for the Somerville Marginal facility. Table 5. Somerville Marginal CSO Activations Summary CY CY CY CY CY CY CY CY CY CY CY CY CY CY Average = Total volume treated divided by the number of s CY CY1 CY2 CY3 CY4 CY5 CY6 CY7 CY8 CY9 CY1 CY11 CY12 CY Activations Annual rainfall Figure 5. Somerville Marginal CSO Activations Compared to Precipitation,

8 Volume treated Annual rainfall (inches) CSO Facilities Summary Report CY CY1 CY2 CY3 CY4 CY5 CY6 CY7 CY8 CY9 CY1 CY11 CY12 CY13 Volume treated Annual rainfall Figure 6. Somerville Marginal CSO Volume Treated Compared to Precipitation, Somerville Marginal conventional parameter data is provided in Appendix C, and summarized below in Table 8. Table 6. Somerville Marginal CSO Effluent Characteristics, July 212 December 213 Parameter Minimum Average Maximum TSS (mg/l) BOD (mg/l) Fecal Coliform (col/1 ml) ph (SU) The results of Somerville Marginal priority pollutant testing can be found in Appendix C, Tables C-2 and C-3. As with the other CSO facilities, the target metals were detected in most of the samples. Table 9 summarizes the average metals concentration in the report period. Table 7. Somerville Marginal CSO Effluent Metals, July 212 December 213 Parameter Average Concentration Detected Aluminum (ug/l) of 6 Cadmium (ug/l).43 6 of 8 Calcium (ug/l) of 6 Chromium (ug/l) of 6 Copper (ug/l) of 7 Lead (ug/l) of 9 Magnesium (ug/l) of 6 Mercury (ug/l).7 6 of 6 Nickel (ug/l) of 8 Zinc (ug/l) of 6 8

9 Number of s Annual rainfall (inches) Activations Total volume treated Min Mean Max Total rainfall (inches) CSO Facilities Summary Report 213 Union Park CSO Facility The Union Park CSO facility is a CSO pumping and storage facility in Boston. Physical details of the station can be found in Appendix D. It operates under a different permit than the previous CSO facilities, but is included in this report for completeness purposes. The Union Park CSO facility had its first discharge in July 27. Table 1 summarizes the s since 27, and Figures 7 and 8 cover s and volume discharged versus precipitation, respectively. Table 1. Union Park CSO Activations Summary CY CY CY CY CY CY CY Average = Total volume treated divided by the number of s CY7 CY8 CY9 CY1 CY11 CY12 CY Activations Annual rainfall Figure 7. Union Park CSO Activations Compared to Precipitation,

10 Volume treated Annual rainfall (inches) CSO Facilities Summary Report CY7 CY8 CY9 CY1 CY11 CY12 CY Volume treated Annual rainfall Figure 8. Union Park CSO Volume Treated Compared to Precipitation, Table 11 lists conventional parameters measured in samples of Union Park effluent. More detailed results can be found in Appendix D-1. Table 11. Union Park CSO Effluent Characteristics, July 212 December 213 Parameter Minimum Average Maximum TSS (mg/l) BOD (mg/l) Fecal Coliform (col/1 ml) Enterococcus (col/1ml) ph (SU)

11 CSO Facilities Summary Report 213 Table 12 shows the results of tests for various metals in Union Park effluent. Detailed results on concentrations and loadings can be found in Appendices D-2 and D-3 respectively. Table 12. Union Park CSO Effluent Metals, July 212 December 213 Parameter Average Concentration Detected Aluminum (ug/l) of 3 Antimony (ug/l).5 of 3 Arsenic (ug/l) 2 3 of 3 Beryllium (ug/l).5 of 3 Cadmium (ug/l).13 of 6 Calcium (ug/l) of 3 Chromium (ug/l) of 6 Copper (ug/l) of 6 Lead (ug/l) 12 6 of 6 Magnesium (ug/l) 37 3 of 3 Mercury (ug/l).2 2 of 3 Nickel (ug/l).75 1 of 6 Selenium (ug/l).5 of 3 Silver (ug/l).25 of 3 Thallium (ug/l).25 of 3 Zinc (ug/l) of 6 11

12 Discharge Total Peak Effluent Rainfall Duration Volume Flow ph BOD TSS Fecal coliform TCR Date (inches) (hours) (S.U.) (mg/l) (mg/l) (col/1 ml) (mg/l) July < < <.2 August September < <.2 October November December < < < < < < < < < <.2 January February March April May June < < < < < < < < <.2 July < <.2 August September October November December <.2 Total Average Minimum Maximum* Number of CSO events 7 Appendix A-1. Cottage Farm CSO Facility Operations Summary, July December 213 = No * = Per the NPDES permit, maximum chlorine residual is the highest single sample. Boxed dates indicate a single event spread out over multiple days. 1

13 Table A-2. Cottage Farm CSO Facility Effluent Characterization, July December 213 Jul-12 Aug Sep Oct Nov Dec Jan-13 Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Average Maximum Detected Metals (ug/l) ALUMINUM ~ ~ ~ of 4 CADMIUM ~ ~ ~ of 7 CALCIUM ~ ~ ~ of 4 CHROMIUM ~ ~ ~ of 4 COPPER ~ ~ ~ of 4 LEAD ~ ~ ~ of 5 MAGNESIUM ~ ~ ~ of 4 MERCURY ~ ~ ~ of 4 NICKEL ~ ~ ~ of 5 SILVER.354 ~ ~ ~ ~ ~ ~ of 1 ZINC ~ ~ ~ of 4 Surfactants and Total Organic Carbon (mg/l) SURFACTANTS ~ ~ ~ ~ ~ of 2 TOTAL ORGANIC CARBON ~ ~ ~ of 4 Table A-3. Cottage Farm CSO Facility Effluent Loadings, July December 213 Jul-12 Aug Sep Oct Nov Dec Jan-13 Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Average Maximum Detected Metals (lbs/day) ALUMINUM ~ ~ ~ of 4 CADMIUM.5.1 ~ ~ ~ of 7 CALCIUM ~ ~ ~ of 4 CHROMIUM ~ ~ ~ of 4 COPPER ~ ~ ~ of 4 LEAD ~ ~ ~ of 5 MAGNESIUM ~ ~ ~ of 4 MERCURY.1.3 ~.3.4 ~ ~ of 4 NICKEL ~ ~ ~ of 5 SILVER.3 ~ ~ ~ ~ ~ ~ of 1 ZINC ~ ~ ~ of 4 Surfactants and Total Organic Carbon (lbs/day) SURFACTANTS ~ ~ ~ ~ ~ of 2 TOTAL ORGANIC CARBON ~ ~ ~ of 4 = No ~ = Activation that month, but no data or no sample taken Results in bold indicate one or more detects in the month. Yearly averages are calculated from individual results collected in the fiscal year. Non-detected compounds are assumed to equal one half of the detection limit for metals and inorganics and one tenth of the reporting limit for organic compounds. 2

14 Discharge Total Peak Effluent Rainfall Duration Volume Flow ph BOD TSS Fecal coliform TCR Date (inches) (hours) (S.U.) (mg/l) (mg/l) (col/1 ml) (mg/l) July August September < < <.2 October November December < < < < < < < < < < < < < < < <.2 January February March April May < < < < < June July August < < < < < < < <.2 September < < <.2 October November SR 94 2 < < < < <.2 56 <1 < < < < < < <.2 December Total Average Minimum Maximum* Number of CSO events 31 Appendix B-1. Prison Point CSO Facility Operations Summary, July December 213 = No * = Per the NPDES permit, maximum chlorine residual is the highest single sample. Boxed dates indicate a single event spread out over multiple days. 3

15 Table B-2. Prison Point CSO Facility Effluent Characterization, July December 213 Jul-12 Aug Sep Oct Nov Dec Jan-13 Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Average Maximum Detected Metals (ug/l) ALUMINUM ~ ~ 981 ~ 121 ~ ~ ~ ~ ~ ~ of 4 CADMIUM ~ ~.41 ~.473 ~ ~ ~ ~ ~ ~ of 4 CHROMIUM ~ ~ 23 ~ 12.3 ~ ~ ~ ~ ~ ~ of 4 COPPER ~ ~ 56.4 ~ 56.7 ~ ~ ~ ~ ~ ~ of 4 LEAD ~ ~ 44.9 ~ 49.2 ~ ~ ~ ~ ~ ~ of 4 MAGNESIUM ~ ~ 271 ~ 186 ~ ~ ~ ~ ~ ~ of 4 MERCURY ~ ~.17 ~.24 ~ ~ ~ ~ ~ ~ of 4 NICKEL ~ ~ 16.3 ~ 2.5 ~ ~ ~ ~ ~ ~ of 6 ZINC ~ ~ 156 ~ 175 ~ ~ ~ ~ ~ ~ of 4 Surfactants and Total Organic Carbon (mg/l) SURFACTANTS ~ ~.215 ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ of 1 TOTAL ORGANIC CARBON ~ ~ 11.2 ~ 11.7 ~ ~ ~ ~ ~ ~ of 4 Table B-3. Prison Point CSO Facility Effluent Loadings, July December 213 Jul-12 Aug Sep Oct Nov Dec Jan-13 Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Average Maximum Detected Metals (lbs/day) ALUMINUM ~ ~ ~ ~ ~ ~ ~ ~ ~ of 4 CADMIUM ~ ~.6 ~.2 ~ ~ ~ ~.5.5 ~ ~ of 4 CHROMIUM ~ ~ 3.43 ~.63 ~ ~ ~ ~ ~ ~ of 4 COPPER ~ ~ 8.42 ~ 2.88 ~ ~ ~ ~ ~ ~ of 4 LEAD ~ ~ 6.7 ~ 2.5 ~ ~ ~ ~ ~ ~ of 4 MAGNESIUM ~ ~ ~ ~ ~ ~ ~ ~ ~ of 4 MERCURY ~ ~.2 ~.1 ~ ~ ~ ~.1.1 ~ ~ of 4 NICKEL ~ ~ 2.43 ~.13 ~ ~ ~ ~.5.38 ~ ~ of 6 ZINC ~ ~ ~ 8.9 ~ ~ ~ ~ ~ ~ of 4 Surfactants and Total Organic Carbon (lbs/day) SURFACTANTS ~ ~ 32.1 ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ of 1 TOTAL ORGANIC CARBON ~ ~ ~ ~ ~ ~ ~ ~ ~ of 4 = No ~ = Activation that month, but no data or no sample taken Results in bold indicate one or more detects in the month. Yearly averages are calculated from individual results collected in the fiscal year. Non-detected compounds are assumed to equal one half of the detection limit for metals and inorganics and one tenth of the reporting limit for organic compounds. 4

16 Appendix C-1. Somerville Marginal CSO Facility Operations Summary, July December 213 Discharge Total Peak Effluent Rainfall Duration Volume Flow ph BOD TSS Fecal coliform TCR Date (inches) (hours) (S.U.) (mg/l) (mg/l) (col/1 ml) (mg/l) July August September < < < < ND < < < < < < < < < < <.2 October < < < November December January February March April May June July August September < < October November December <.2 Total Average Minimum Maximum* Number of CSO events 35 = No * = Per the NPDES permit, maximum chlorine residual is the highest single sample. Boxed dates indicate a single event spread out over multiple days. 5

17 Table C-2. Somerville Marginal CSO Facility Effluent Characterization, July December 213 Jul-12 Aug Sep Oct Nov Dec Jan-13 Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Average Maximum Detected Metals (ug/l) ALUMINUM ~ ~ 279 ~ ~ ~ ~ ~ 566 ~ ~ ~ ~ of 6 CADMIUM ~ ~.46 ~ ~ ~ ~ ~.59 ~ ~ ~ ~ of 8 CALCIUM ~ ~ 592 ~ ~ ~ ~ ~ 936 ~ ~ ~ ~ of 6 CHROMIUM ~ ~ ~ ~ ~ ~ ~ 7. ~ ~ ~ ~ of 6 COPPER ~ ~ ~ ~ ~ ~ ~ 6.34 ~ ~ ~ ~ of 7 LEAD ~ ~ ~ ~ ~ ~ ~ 12.2 ~ ~ ~ ~ of 9 MAGNESIUM ~ ~ ~ ~ ~ ~ ~ 153 ~ ~ ~ ~ of 6 MERCURY ~ ~.99 ~ ~ ~ ~ ~.43 ~ ~ ~ ~ of 6 NICKEL ~ ~ 5.57 ~ ~ ~ ~ ~ 1.43 ~ ~ ~ ~ of 8 ZINC ~ ~ ~ ~ ~ ~ ~ 39.3 ~ ~ ~ ~ of 6 Surfactants and Total Organic Carbon (mg/l) SURFACTANTS ~ ~.72 ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ of 3 TOTAL ORGANIC CARBON ~ ~ 9.18 ~ ~ ~ ~ ~ 5.52 ~ ~ ~ ~ of 6 Table C-3. Somerville Marginal CSO Facility Effluent Loadings, July December 213 Jul-12 Aug Sep Oct Nov Dec Jan-13 Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Average Maximum Detected Metals (lbs/day) ALUMINUM ~ ~ ~ ~ ~ ~ ~ 7.15 ~ ~ ~ ~ of 6 CADMIUM ~ ~.2 ~ ~ ~ ~ ~.7 ~ ~ ~ ~ of 8 CALCIUM ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ of 6 CHROMIUM ~ ~.42 ~ ~ ~ ~ ~.87 ~ ~ ~ ~ of 6 COPPER ~ ~ 1.3 ~ ~ ~ ~ ~.79 ~ ~ ~ ~ of 7 LEAD ~ ~ 2.38 ~ ~ ~ ~ ~ 1.51 ~ ~ ~ ~ of 9 MAGNESIUM ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ of 6 MERCURY ~ ~.4 ~ ~ ~ ~ ~.1 ~ ~ ~ ~ of 6 NICKEL ~ ~.2 ~ ~ ~ ~ ~.18 ~ ~ ~ ~ of 8 ZINC ~ ~ 5.26 ~ ~ ~ ~ ~ 4.87 ~ ~ ~ ~ of 6 Surfactants and Total Organic Carbon (lbs/day) SURFACTANTS ~ ~ 2.45 ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ of 3 TOTAL ORGANIC CARBON ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ of 6 = No ~ = Activation that month, but no data or no sample taken Results in bold indicate one or more detects in the month. Yearly averages are calculated from individual results collected in the fiscal year. Non-detected compounds are assumed to equal one half of the detection limit for metals and inorganics and one tenth of the reporting limit for organic compounds. 6

18 Discharge Total Peak Effluent Rainfall Duration Volume Flow ph BOD TSS Fecal coliform Enterococcus TCR Date (inches) (hours) (S.U.) (mg/l) (mg/l) (col/1 ml) (col/1 ml) (mg/l) July August September ND ND October November December January February March April May June < <1 < <1 6.2 <1 < < <1 < < < <1 < < < <1 9 6 <1 9.3 July <1 < < <1 6.1 < <1 August September October November December Total Average Minimum Maximum* Number of CSO events 11 Appendix D-1. Union Park CSO Facility Operations Summary, July December 213 = No * = Per the NPDES permit, maximum chlorine residual is the highest single sample. Boxed dates indicate a single event spread out over multiple days. 7

19 Table D-2. Union Park CSO Facility Effluent Characterization, July December 213 Jul-12 Aug Sep Oct Nov Dec Jan-13 Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Average Maximum Detected Metals (ug/l) ALUMINUM ~ ~ 52 ~.34 ~ ~ ~ ~ of 3 ANTIMONY ~ ~ 1 ~.1 ~ ~ ~ ~.5 1. of 3 ARSENIC ~ ~ 4 ~.35 ~ ~ ~ ~ of 3 BERYLLIUM ~ ~ 1 ~.1 ~ ~ ~ ~.5 1. of 3 CADMIUM ~ ~.25 ~.14 ~ ~ ~ ~ of 6 CALCIUM ~ ~ 77 ~.5 ~ ~ ~ ~ of 3 CHROMIUM ~ ~ 3. ~.25 ~ ~ ~ ~ of 6 COPPER ~ ~ 39.5 ~.39 ~ ~ ~ ~ of 6 LEAD ~ ~ 24 ~.15 ~ ~ ~ ~ of 6 MAGNESIUM ~ ~ 74 ~.5 ~ ~ ~ ~ of 3 MERCURY ~ ~.23 ~.17 ~ ~ ~ ~ of 3 NICKEL ~ ~ 1.5 ~.1 ~ ~ ~ ~ of 6 SELENIUM ~ ~ 1 ~.75 ~ ~ ~ ~.5 1. of 3 SILVER ~ ~.5 ~.5 ~ ~ ~ ~.25.5 of 3 THALLIUM ~ ~.5 ~.5 ~ ~ ~ ~.25.5 of 3 ZINC ~ ~ 92.5 ~.47 ~ ~ ~ ~ of 6 Surfactants and Total Organic Carbon (mg/l) SURFACTANTS ~ ~.73 ~.65 ~ ~ ~ ~ of 3 TOTAL ORGANIC CARBON ~ ~ 12 ~ 6.85 ~ ~ ~ ~ of 3 Table D-3. Union Park CSO Facility Effluent Loadings, July December 213 Jul-12 Aug Sep Oct Nov Dec Jan-13 Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Average Maximum Detected Metals (lbs/day) ALUMINUM ~ ~ ~.3 ~ ~ ~ ~ of 3 ANTIMONY ~ ~.3 ~.1 ~ ~ ~ ~.2.3 of 3 ARSENIC ~ ~.12 ~.3 ~ ~ ~ ~ of 3 BERYLLIUM ~ ~.3 ~.1 ~ ~ ~ ~.2.3 of 3 CADMIUM ~ ~.1 ~. ~ ~ ~ ~..1 of 6 CALCIUM ~ ~ ~.42 ~ ~ ~ ~ of 3 CHROMIUM ~ ~.9 ~.2 ~ ~ ~ ~ of 6 COPPER ~ ~ 1.19 ~.3 ~ ~ ~ ~ of 6 LEAD ~ ~.72 ~.14 ~ ~ ~ ~ of 6 MAGNESIUM ~ ~ ~.42 ~ ~ ~ ~ of 3 MERCURY ~ ~. ~.1 ~ ~ ~ ~ of 3 NICKEL ~ ~.5 ~.1 ~ ~ ~ ~ of 6 SELENIUM ~ ~.3 ~.5 ~ ~ ~ ~.2.3 of 3 SILVER ~ ~.2 ~.4 ~ ~ ~ ~.1.2 of 3 THALLIUM ~ ~.2 ~.4 ~ ~ ~ ~.1.2 of 3 ZINC ~ ~ 2.78 ~.42 ~ ~ ~ ~ of 6 Surfactants and Total Organic Carbon (lbs/day) SURFACTANTS ~ ~.2 ~.6 ~ ~ ~ ~ of 3 TOTAL ORGANIC CARBON ~ ~.36 ~.54 ~ ~ ~ ~ of 3 = No ~ = Activation that month, but no data or no sample taken Results in bold indicate one or more detects in the month. Yearly averages are calculated from individual results collected in the fiscal year. Non-detected compounds are assumed to equal one half of the detection limit for metals and inorganics and one tenth of the reporting limit for organic compounds. 8