LAGUNA DE BAY MONTHLY WATER QUALITY STATUS ...LAGUNA LAKE DEVELOPMENT AUTHORITY LAGUNA DE BAY MONTHLY WATER QUALITY STATUS REPORT JANUARY 2009 DENR Water Quality Criteria/ Water Usage

LAGUNA LAKE DEVELOPMENT AUTHORITY LAGUNA DE BAY MONTHLY WATER QUALITY STATUS REPORT JANUARY 2009

LAGUNA DE BAY MONTHLY WATER QUALITY STATUS REPORT

JANUARY 2009

Salinity Intrusion: No Average Lake Water Temperature: 21.9°C

Sampling Dates (Lake): 01 January 2009 Sampling Dates (Tributary): 19 January 2009

Oxygen and Oxygen Demand

This month's BOD and % DO saturations in lake Stns. I and V remained suitable for Classes A and B when compared to last month's map results. Likewise, obtained BOD and % DO saturations in lake Stns. II IV and VIII's were also found suitable for Classes A. and B The The tributary rivers' BOD remained at worse than Class D in Stns. 2, 3 and 6, and at Classes A and B in Stns. 7 to 13; worsened from Class C to Class D in Stns. 1 and 5, and from Class D to worse than Class D in Stns. 14 and 15; and improved from worse than Class D to Class D in Stn. 4. Previous month's water quality classifications for % DO saturations in the tributary rivers were retained this month in Stns. 1 to 6 and 15 at worse than Class D, and in Stns. 8 to 11 at Classes A and B while in other stations, improved from worse than Class D to Class C in Stn. 7 and from Class D to Classes A and B in Stn. 14, and worsened from Classes A and B to Class D in Stn. 12, and from Classes A and B to worse than Class D in Stn. 13. Monitoring of COD in the lake and in the tributary rivers was not undertaken this month.

Bacterial Pollution

Comparative assessment of the obtained map results in the lake for total coliforms this month and last month revealed that the water quality classifications in Stns. I and V remained at Classes A and B. Lake Stns. II and IV also yielded Classes A and B classification while lake Stn. VIII was at Class C for total coliforms. For the tributary river, all of the fifteen (15) monitoring stations retained their last month's worse than Class C classification for total coliforms. In terms of fecal coliforms, the water quality classifications in the lake worsened from Class A to Class B in Stn.I and improved from worse than Class B to Class B in Stn. V. The fecal coliform levels in other lake stations were at Class A, Class B and worse than Class B in Stns. II, IV and VIII, respectively. All of the tributary river monitoring stations continued to yield fecal coliforms levels within worse than Class B.


DENR Water Quality Criteria/Water Usage and Classification for Fresh Water

Class A - Public water supply II (require complete treatment to meet national standards for drinking water) Class B - Recreational water class I (for contact recreation as bathing and swimming) Class C - Fishery water for the propagation & growth of fish ( non-contact recreation & industrial use class I) Class D - For agriculture, irrigation, livestock watering and industrial water supply class II

Euthropic Level

The assessment of the lake's dissolved nitrogen showed that Stn. I retained its previous month's low level while in Stn. V, increased from very low to low level. Other lake stations recorded very low levels in Stns. II and IV and low level in Stn. VIII for dissolved nitrogen. In the tributary rivers, the dissolved nitrogen levels remained high in Stns. 1 to 5, 7, 14 and 15, very low in Stns. 10 and 11, low in Stn. 12 and medium in Stn. 13. Other river stations' dissolved nitrogen levels decreased from low to very low in Stn. 6, and from medium to low in Stns. 8 and 9. Measured phosphate levels in the lake worsened from Class A to Class B, and remained suitable for Class A in Stn. V while in Stn. II and IV were at Class A and in Stn VIII, at Class B. The water quality classifications for phosphate in the tributary rivers remained at worse than Class C in Stns. 1 to 5, 7, 14 and 15, at Class C in Stns. 8 and 9, and at Class A in Stns. 10 and 11; improved from worse than Class C to Class C in Stn. 6; and worsened from Class A to worse than Class C in Stn. 12, and from Class C to worse than Class C in Stn. 13. For phytoplankton counts, measured concentrations in the lake increased from medium to very high and from high to very high in Stn. I and Stn. V, respectively, recorded at very high in Stns. II and IV, and at high in Stn. VIII. The most dominant phytoplankton organisms in the lake for this period were Melosira sp. (diatom) in Stns. I, II V and VIII and Stephanodiscus sp. (diatom) in Stn. IV. The lake's chlorophyll-a levels in the lake for this month in comparison to last month's map results remained at medium in Stn. I, increased from medium to high in Stn. V, and were at medium in Stns. II, IV and VIII. The lake's average primary production for this month was lower than last month at 1.01 tons carbon/hectare/year and this is equivalent to a fish production potential computed at 0.81 ton/ hectare/year.


Hazardous Substance

Compared to last month's map results, the water quality classifications for oil and grease in the lake this month worsened from Classes A and B to Class C in Stn. I and remained very low in Stn. V. Other lake stations' oil and grease levels were suitable for Classes A and B. The tributary rivers' oil and grease levels remained at Classes A and B in Stns. 1, 2, 4, 5, 7 and 9 to 15; and improved from Class D to Classes A and B in Stn. 3, and from Class C to Classes A and B in Stns. 6 and 8. The quarterly monitoring of lead, hexavalent chromium and cadmium in the lake and in the tributary rivers was not scheduled this month.


Overall Status

* position your cursor over the station number to see the location Station

Remarks

Status worsened to Class C from Class A, with oil and grease concentration at Class C

Status at Class A, with BOD, % DO saturation, total and fecal coliforms, phosphate, and oil and grease levels at Class A

Status at Class B, with fecal coliform concentration at Class B

Status improved to Class B from Class C, with with fecal coliform concentration at Class B

Status at Class C, with with total and fecal coliform concentrations at Class C

No monitoring conducted (no data)




Worse than Class D status maintained, with very low % DO saturation

Worse than Class D status maintained, with very low % DO saturation and very high BOD concentration





Status improved to Class D from worse than Class D, with high total coliform and phosphate concentrations

Class D status maintained, with high total coliform concentration




Class D status maintained, with low % DO saturation, and high total coliform and phosphate concentrations

Status worsened to worse than Class D from Class D, with very low % DO saturation

Status worsened to worse than Class D from Class D, with very high BOD concentration

Worse than Class D status maintained, with very low % DO saturation and very high BOD concentration * Only listed parameters with DENR water quality criteria for freshwater systems have been included in the assessment of the overall status

LAGUNA LAKE DEVELOPMENT AUTHORITY LAGUNA DE BAY MONTHLY WATER QUALITY STATUS REPORT FEBRUARY 2009


FEBRUARY 2009


Sampling Dates (Lake): 10 February 2009 Sampling Dates (Tributary): 16 February 2009


When compared to last month's map results, the BOD concentrations and % DO saturations in all lake stations still conformed to the water quality criteria for Classes A and B this month. The water quality assessments in the tributary rivers based on the obtained BOD levels worsened in Stns. 1 and 4

from Class D to worse than Class D, and in Stns. 8 and 9 from Classes A and B to Class C; remained at worse than Class D in Stns. 2, 3, 6 and 15, at

Class D in Stn. 5, and at Classes A and B in Stns. 7 and 10 to 13; and improved in Stn. 14 from worse than Class D to Class C. The % DO saturations in the tributary rivers remained at worse than Class D in Stns. 1 to 6 and 15, and at Classes A and B in Stns. 8 to 11 and 14; and worsened from Class C to

worse than Class D in Stn. 7, from Class D to worse than Class D in Stn. 12, and from Classes A and B to worse than Class D in Stn. 13. The COD

analysis of water taken from the lake and from the tributary rivers was not undertaken this month

Bacterial Pollution

Obtained map results this month for total coliforms were exactly the same as last month with Stns. I, II, IV and V remained suitable for Classes A and B, Stn. VIII maintained its suitability for Class C and all of the river stations with worse than Class C classification. For fecal coliforms, obtained water

quality classifications in the lake remained at Class A in Stn. II, at Class B in Stns. IV and V and at worse than Class B in Stn. VIII while in Stn. I,

worsened from Class B to worse than Class B. All river stations continued to yield worse than Class B classification.




Euthropic Level

Measured dissolved nitrogen levels in the lake this month were still very low in Stns. I, II and IV, and decreased from low to very low in Stns. V and VIII. For phosphate, obtained map results in the lake this month remained suitable for Class A in Stns. II, IV and V, and improved in both Stns. I and VIII

from Class B to Class A. The dissolved nitrogen and inorganic phosphate in the tributary rivers were not measured this month. The phytoplankton counts in the lake decreased from very high to low in Stns. I and IV, and from very high to high in Stn. II; remained very high in Stn. V; and increased from

high to very high in Stn. VIII. The most dominant phytoplankton organisms in the lake for this period were Melosira sp. (diatom) in Stns. I, II, V and VIII

and Stephanodiscus sp. (diatom) in Stn. IV. The phytoplankton counts in the lake decreased from very high to low in Stns. I and IV, and from very high

to high in Stn. II; remained very high in Stn. V; and increased from high to very high in Stn. VIII. The most dominant phytoplankton organisms in the lake for this period were Melosira sp. (diatom) in Stns. I, II, V and VIII and Stephanodiscus sp. (diatom) in Stn. IV. For chlorophyll-a, measured

concentrations in the lake remained at medium in Stns. I and VIII; and decreased from medium to low in Stns. II and IV, and from high to medium in

Stn. V. This month's average primary production in the lake was comparatively higher than last month at 3.49 tons carbon/hectare/year and this is equivalent to a fish production potential computed at 2.79 tons/hectare/year.


Hazardous Substance

Comparison of this month with last month's map results for oil and grease in the lake showed that the water quality classifications improved in Stn. I from Class C to Classes A and B, and remained at Classes A and B in Stns. II, IV, V and VIII. Previous month's water quality classifications for oil and

grease in the tributary rivers were retained this month in Stns. 1, 5, 10, 11 and 12 at Classes A and B while in the rest of the stations, worsened from

Classes A and B to Class D in Stns. 2, 4, 6 to 9 and 15, from Classes A and B to worse than Class D in Stn. 3, and from Classes A and B to Class C in Stns. 13 and 14. The results of the quarterly monitoring of lead, hexavalent chromium and cadmium conducted this month indicated that all lake and

river monitoring stations yielded concentrations suitable for Classes A, B and C.


Overall Status


Remarks

Class C status maintained, with fecal coliform concentration at Class C

Class A status maintained, with BOD, %DO saturation, total and fecal coliform, phosphate, oil and grease, and heavy metals levels at Class

A

Class B Status maintained, with fecal coliform concentration at Class B

Class B Status maintained, with fecal coliform concentration at Class B

Class C status maintained, with total coliform and fecal coliform concentrations at Class C







Worse than Class D status maintained, with very low % DO saturation and very high BOD, and oil and grease concentration





Class D status maintained, with high total coliform, and oil and grease concentrations





Status improved to Class D from worse than Class D, with high total coliform concentration

Status improved to Class D from worse than Class D, with high total coliform concentration

Worse than Class D status maintained, with very low % DO saturation, and very high BOD concentrations * Only listed parameters with DENR water quality criteria for freshwater systems have been included in the assessment of the overall status

LAGUNA LAKE DEVELOPMENT AUTHORITY LAGUNA DE BAY MONTHLY WATER QUALITY STATUS REPORT MARCH 2009


March 2009


Sampling Dates (Lake): 03 March 2009 Sampling Dates (Tributary): 09 March 2009


This month's map results when compared to last month's assessment showed that the obtained water quality classifications for BOD in the lake remained at Classes A and B in Stns. I, II, IV, V and VIII. In the tributary rivers, the BOD remained at worse than Class D in Stns. 1, 2 3, 6 and 15, at Class D in

Stn. 5, at Classes A and B in Stns. 7, and 10 to 13, and at Class C in Stn. 14; improved from worse than Class D to Class C in Stn. 4 and from Class C to

Classes A and B in Stns. 8 and 9. In terms of % DO saturation, all monitored lake stations maintained their last month's suitability for Classes A and B. The tributary rivers' obtained water quality classifications for % DO saturation were exactly the same as last month, specifically at worse than Class D in

Stns. 1 to 7, 12 and 15, and at Classes A and B in Stns. 8 to 11, 13 and 14. For COD, no analysis was done for the lake and river stations.

Bacterial Pollution

In comparison to last month's map results, the lake's total coliforms this month remained suitable for Classes A and B in Stns. I, II, IV and V, and at

Class C in Stn. VIII. All fifteen (15) river stations retained their previous month's worse than Class C levels for total coliforms. The lake's fecal coliforms remained at worse than Class B in Stns. I and VIII, at Class A in Stn. II, and at Class B in Stn. IV while in Stn. V, worsened from Class B to worse than

Class B. All river stations maintained their previous month's worse than Class B water quality classifications for fecal coliforms.




Euthropic Level

The lake's dissolved nitrogen levels remained very low in Stns. I, II, IV, V, and VIII. This month's tributary rivers' dissolved nitrogen concentrations were high in Stns. 1, 3, 4, 5 and 7, very high in Stns. 2 and 15, low in Stns. 6, 8 and 13, medium in Stns. 9 and 12, and very low in Stns. 10, 11 and 14. For

phosphate, measured concentrations in the lake in Stns. II and VIII remained suitable for Class A while in Stns. I, IV and V, previous month's suitability

for Class A worsened this month to Class B. In the tributary rivers, obtained water quality classifications based on measured phosphate levels were at worse than Class C in Stns. 1 to 7 and 12 to 15, at Class C in Stns. 8 and 9, at Class A in Stn. 10, and at Class B in Stn. 11. Measured phytoplankton

counts in the lake remained very high in Stn. V; increased from low to high in Stn. I, from high to very high in Stn. II, and from low to very high in Stn.

IV; and decreased from very high to high in Stn. VIII. This month's most abundant phytoplankton organisms in the lake include Melosira sp. (diatom) in

Stns. I, II, V and VIII and Microcystis sp. (blue-green) in Stn. IV. The lake's chlorophyll-a levels remained at medium in Stns. I, V and VIII, and low in Stns. II and IV. The lake's average primary production this month was higher than last month at 6.71 tons carbon/hectare/year and this is equivalent to

a fish production potential computed at 5.37 tons/hectare/year.


Hazardous Substance

When compared to last month's map results, the oil and grease of the lake remained suitable for Classes A and B in Stn. I; and worsened in the other four (4) stations: from Classes A and B to Class D in Stn. II, and from Classes A and B to Class C in Stns. IV, V and VIII. This month's oil and grease

levels remained suitable for Classes A and B in Stns. 1, 10,11 and 12, and at Class D in Stns. 9 and 15 while in other stations, improved from Class D to

Class C in Stns 2, 4 and 6, from worse than Class D to Class C in Stn. 3, from Class D to Classes A and B in Stns. 7 and 8, and from Class C to Classes A and B in Stns. 13 and 14; and worsened from Classes A and B to Class C in Stn. 5. The quarterly monitoring of heavy metals for lead, hexavalent

chromium and cadmium was not scheduled this month.


Overall Status


Remarks


Status worsened to Class D from Class A, with high oil and grease concentration

Status worsened to Class C from Class B, with oil and grease concentration at Class C

Status worsened to Class C from Class B, with fecal coliform, and oil and grease concentrations at Class C

Class C status maintained, with total coliform and fecal coliform, and oil and grease concentrations at Class C

















Class D status maintained, with high total coliform and phosphate concentrations


Worse than Class D status maintained, with very low % DO saturaton and very high BOD concentration * Only listed parameters with DENR water quality criteria for freshwater systems have been included in the assessment of the overall status

LAGUNA LAKE DEVELOPMENT AUTHORITY LAGUNA DE BAY MONTHLY WATER QUALITY STATUS REPORT APRIL 2009


APRIL 2009


Sampling Dates (Lake): 13 April 2009 Sampling Dates (Tributary): 20 April 2009


All lake stations monitored this month continued to yield BOD concentrations and % DO saturations suitable for Classes A and B when compared to last month's obtained map results. In the tributary rivers, the water quality classifications for BOD remained at worse than Class D in Stns. 1, 2, 3 and 6, at

Classes A and B in Stns. 8 to 12, and at Class C in Stn. 14; worsened from Class C to worse than Class D in Stn. 4, from Class D to worse than Class D in

Stn. 5, and from Classes A and B to Class C in Stns. 7 and 13; and improved from worse than Class D to Classs D in Stn. 15. The assessment of the % DO saturations in the tributary rivers in comparison to last month's map results indicated that the water quality classifications remained at worse than

Class D in Stns. 1 to 7 and 15, and at Classes A and B in Stns. 8 to 11 and 14 while in Stn. 12, improved from worse than Class D to Class D, and in Stn.

13, worsened from Classes A and B to Class C. In terms of COD, measured concentrations in the lake in Stns. I, II, IV, V and VIII were all at very low levels. Obtained COD levels in the tributary rivers this month were: high in Stns. 1 and 5, very high in Stns. 2, 3 and 6, medium in Stns. 4, 13 and 15,

low in Stns. 7, 9 to 12 and 14, and very low in Stn. 8.

Bacterial Pollution

In comparison to last month's map results, the lake's total coliform levels remained suitable for Classes A and B in Stns. I, II, IV and V while in Stn. VIII, improved from Class C to Classes A and B. All river stations yielded total coliform concentrations within worse than Class C levels. In terms of fecal

coliforms, measured concentrations remained suitable for worse than Class B in lake Stns. I and V and all of the fifteen (15) tributary river stations, at Class A in lake Stn II, and at Class B in Stns. IV; and improved from worse than Class B to Class B in Stn. VIII.




Euthropic Level

As compared to last month's map results, the dissolved nitrogen of the lake remained at very low levels in Stns. I, II, IV, V and VIII. The tributary rivers' dissolved nitrogen levels remained high in Stns. 1, 3, 4 and 5, low in Stns. 6 and 8, medium in Stn. 9, and very low in Stn. 11; decreased from very high

to high in Stns. 2 and 15, from high to medium in Stn. 7, and from medium to low in Stn. 12; and increased from very low to low in Stn. 10, from low to

medium in Stn. 13, and from very low to high in Stn. 14. Obtained phosphate concentrations in the lake remained suitable for Class A in Stns. II and VIII; and improved from Class B to Class A in Stns. I, IV and V. Previous month's water quality classifications for phosphate in the tributary rivers were

maintained this month in Stns. 1 to 7 and 13 to 15 at worse than Class C; worsened from Class C to worse than Class C in Stns . 8 and 9, and from Class

A to Class B in Stn. 10; and improved from Class B to Class A in Stn. 11, and from worse than Class C to Class C in Stn. 12. The lake's phytoplankton

counts increased from high to very high in Stns. I and VIII, and remained very high in Stns. II, IV and V. The most dominant phytoplankton organisms in the lake this month were Microcystis sp. (blue-green) in Stn. I and Melosira sp. (diatom) in Stns. II, IV, V and VIII. The chlorophyll-a levels in the lake

decreased from medium to low in Stn. I, from low to very low in Stn. IV; increased from low to medium in Stn. II; and remained at medium in Stns. V

and VIII. The lake' average primary production for the month was lower than last month at 1.13 tons carbon/hectare/year and this is equivalent to a fish production potential at 0.90 ton/hectare/year.


Hazardous Substance

When compared to last month's map results, obtained water quality classifications for oil and grease in the lake this month remained at Classes A and B in Stn. I, Class D in Stn. II, and Class C in Stn. V; and worsened in both Stns. IV and VIII from Class C to Class D. The tributary rivers' oil and grease

levels worsened from Classes A and B to Class D in Stn. 1, from Class C to worse than Class D in Stn. 3, and from Classes A and B to Class C in Stns. 12,

13 and 14; improved from Class C to Classes A and B in Stns. 2, 4 and 5, and from Class D to Classes A and B in Stns. 9 and 15; and remained at Class C in Stn. 6, and at Classes A and B, in Stns. 7, 8, 10 and 11. The monitoring of lead, hexavalent chromium and cadmium in the lake and in the tributary

rivers was not scheduled this month.


Overall Status


Remarks


Class D status maintained, with high oil and grease concentration

Status worsened to Class D from Class C, with high oil and grease concentration

Class C status maintained, with total coliform and fecal coliform, and oil and grease concentrations at Class C

Status worsened to Class D from Class C, with high oil and grease concentration







Worse than Class D status maintained, with very low % DO saturation and very high BOD and oil and grease concentrations









Status improved to Class D from worse than Class D, with low % DO saturation and high total coliform concentration



Worse than Class D status maintained, with very low % DO saturaton * Only listed parameters with DENR water quality criteria for freshwater systems have been included in the assessment of the overall status

LAGUNA LAKE DEVELOPMENT AUTHORITY LAGUNA DE BAY MONTHLY WATER QUALITY STATUS REPORT MAY 2009


May 2009


Sampling Dates (Lake): 05 May 2009 Sampling Dates (Tributary): 11 May 2009


In comparison to last month's map results, measured BOD concentrations and % DO saturations in the lake remained suitable to Classes A and B in Stns. I, II, IV, V and VIII. Previous month's recorded BOD concentrations in the tributary rivers were retained this month in Stns. 2 and 3 at worse than

Class D, and in Stns. 8 to 12 at Classes A and B. The BOD in other river stations improved from worse than Class D to Class C in Stns. 1, 4, 5 and 6,

from Class C to Classes A and B in Stns. 7, 13 and 14, and from Class D to Class C in Stn. 15. The tributary rivers' % DO saturation continued to be at worse than Class D levels in Stns. 1 to 5 and 15, and at Classes A and B in Stns. 8 to 11 and 14; improved from worse than Class D to Classes A and B in

Stn. 6, from worse than Class D to Class C in Stn. 7, from Class D to Class C in Stn. 12, and from Class C to Classes A and B in Stn. 13. For COD,

measured concentrations in the lake remained very low in Stns. I, IV, V and VIII, and increased from very low to high in Stn. II. The tributary rivers' previous month's COD levels were maintained this month in Stns. 2, 3 and 6 at very high, in Stn. 14 at low, and in Stn. 15 at medium, while in other

stations, decreased from high to low in Stn. 1, and increased from medium to high in Stns. 4 and 13, from high to very high in Stn. 5, from low to very

high in Stn. 7, from very low to very high in Stn. 8, from low to high in Stns. 9, 10 and 12, and from low to medium in Stn. 11.

Bacterial Pollution

Obtained water classifications for total coliforms in the lake this month remained at Classes A and B in Stns. I, II, IV, V and VIII. All tributary river

stations also maintained their previous month's worse than Class C classification. Recorded lake's fecal coliform levels were still at Class A in Stn. II, at worse than Class B in Stn. V and at Class B in Stn. VIII while in Stns. I and IV, improved from Class C to Class B and from Class B to Class A,

respectively. All tributary river stations continued to yield fecal coliform levels at worse than Class B.




Euthropic Level

The lake's dissolved nitrogen concentrations remained very low in Stns. I, II, IV, V and VIII. Comparison of the tributary rivers' dissolved nitrogen map results this month with last month showed that obtained concentrations remained high in Stns. 2 to 4, 14 and 15, medium in Stns. 7 and 13, and low in

Stns. 8, 10 and 12. For the other river stations, the dissolved nitrogen levels decreased from high to medium in Stns. 1 and 5, and from medium to low

in Stn. 9; and increased from low to medium in Stn. 6, and from very low to low in Stn. 11. Based on measured phosphate levels, obtained water quality classifications in the lake remained at Class A in Stns. I, II, IV, V and VIII. The map results for phosphate in the tributary rivers remained at worse than

Class C in Stns. 2 to 9, 13, 14 and 15, and at Class A in Stn. 11; and improved from worse than Class C to Class B in Stn. 1, from Class B to Class A in

Stn. 10, and from Class C to Class B in Stn. 12. Measured phytoplankton counts in the lake remained very high in Stns. I, II, IV, V and VIII. Melosira sp. (diatom) was the most dominant phytoplankton organism in the lake for this period in all stations. For chlorophyll-a, measured concentrations in the lake

increased from low to medium in Stn. I, from very low to medium in Stn. IV, and from medium to high in Stn. VIII; and remained at medium in Stns. II

and V. The lake's average primary production for this month was higher than last month at 3.14 tons carbon/hectare/year and this is equivalent to a fish

production potential estimated at 2.61 tons/hectare/year.


Hazardous Substance

As compared to last month's assessment, the water quality classifications for oil and grease in the lake this month remained at Classes A and B in Stn. I; and improved from Class D to Classes A and B in Stns. II, IV and VIII, and from Class C to Classes A and B in Stn. V. Previous month's oil and grease

levels in the tributary rivers were maintained this month in Stn. 1 at Class D, in Stns. 2, 4, 5, 7, 9 and 11 at Classes A and B, and in Stns. 6 and 14 at

Class C, while in other stations, improved from worse than Class D to Class D in Stn. 3, and from Class C to Classes A and B in Stns. 12 and 13; and worsened from Classes A and B to Class D in Stns. 8 and 15, and from Classes A and B to Class C in Stn. 10. Measured lead, hexavalent chromium and

cadmium concentrations in all monitored lake and tributary river stations this month were found suitable for Classes A, B and C.


Overall Status


Remarks

Status improved to Class B from Class C, with fecal coliform concentration at Class B

Status improved to Class A from Class D, with BOD, %DO saturation, total and fecal coliform, phosphate, oil and grease, and heavy metals

levels at Class A

Status improved to Class A from Class D, with BOD, %DO saturation, total and fecal coliform, phosphate, oil and grease, and heavy metals

levels at Class A


Status improved to Class B from Class D, with fecal coliform concentration at Class B












Class D status maintained, with high total coliform, phosphate , and oil and grease concentrations








LAGUNA LAKE DEVELOPMENT AUTHORITY LAGUNA DE BAY MONTHLY WATER QUALITY STATUS REPORT JUNE 2009


JUNE 2009


Sampling Dates (Lake): 01 June 2009 Sampling Dates (Tributary): 08 June 2009


This month's water quality classifications for BOD and % DO saturation remained suitable for Classes A and B in all of the five (5) monitored stations. In the tributary rivers, comparison of this month with last month's map results for BOD revealed that the water quality classifications improved from Class C

to Classes A and B in Stns. 1 and 15, and from worse than Class D to Class D in Stn. 2; and remained at worse than Class D in Stn. 3, at Class C in Stns.

4, 5 and 6, and at Classes A and B in Stns. 7 to 14. The % DO saturations in the tributary rivers improved from worse than Class D to Class D in Stn. 1; worsened from Classes A and B to Class D in Stn. 6, and from Class C to worse than Class D in Stn. 7; and remained at Classes A and B in Stns, 8 to 11,

13 and 14, at Class C in Stn. 12, and at worse than Class D in Stn. 15. The lake's measured COD levels remained very low in Stns. I, IV and V; decreased

from high to very low in Stn. II; and increased from very low to low in Stn. VIII. Previous month's COD levels in the tributary rivers decreased this month from low to very low in Stn. 1, from very high to very low in Stns. 2, 5 and 13, from very high to high in Stn. 4, from very high to low in Stns. 6 and 7,

from very high to medium in Stn. 8, from high to very low in Stns. 9 and 12, from high to medium in Stn. 10, and from medium to very low in Stn. 11;

and were maintained at very high in Stn. 3, low in Stn. 14, and medium in Stn. 15.

Bacterial Pollution

The map results for total coliforms in the lake remained at Classes A and B in Stns. I, II and IV, and both worsened in Stns. V and VIII from Classes A

and B to Class C while in the tributary rivers, all stations maintained their previous month's worse than Class B classification. For fecal coliforms, the water quality classifications remained at Class A in lake Stn. II, and at worse than Class B in lake Stn. V and in all of the river stations. In lake Stns. I and

VIII, measured fecal coliforms worsened from Class B to worse than Class B.




Euthropic Level

In comparison to last month's map results, the dissolved nitrogen in the lake this month remained very low in Stns. I, II, IV, V and VIII. In the tributary rivers, the dissolved nitrogen levels remained at medium in Stns. 1, 5 and 6, high in Stns. 2, 3, 4, 14 and 15, and low in Stns. 8 and 12; increased from

medium to high in Stn. 7, and from low to medium in Stn. 9; and decreased from low to very low in Stns. 10 and 11, and from medium to low in Stn. 13.

For phosphate, Stns. I, II, IV, and VIII maintained their previous month's suitability for Class A while in Stn. V, the water quality classification worsened from Class A to Class B. In the tributary rivers, the phosphate levels remained at Class B in Stns. 1 and 12, at worse than Class C in Stns. 2 to 9, 14 and

15, and at Class A in Stns. 10 and 11; and improved from Class D to Class C in Stn. 13. The lake's phytoplankton counts remained very high in Stns. I,

IV, V and VIII; and decreased from very high to high in Stn. II. The most dominant phytoplankton organisms in the lake for this period were Microcystis

sp. (blue-green) in Stns. I, V and VIII and Melosira sp. (diatom) in Stns. II and IV. The chlorophyll-a of the lake decreased in all of the five (5) monitored stations: from very high to medium in Stns. I, II, IV and V, and very high to high in Stn. VIII. The lake's average primary production for this month was

lower than last month at 2.12 tons carbon/hectare/year and this is equivalent to a fish production potential estimated at 1.70 tons/hectare/year.


Hazardous Substance

When compared to last month's map results, obtained water quality classifications for oil and grease in the lake this month remained at Classes A and B in Stns. I, II and IV; and worsened from Classes A and B to worse than Class D in Stn. V, and from Classes A and B to Class C in Stn. VIII . The tributary

rivers' oil and grease levels improved from Class D to Class C in Stns. 1 and 15, from Class D to Classes A and B in Stn. 8, and from Class C to Classes A

and B in Stn. 10; worsened from Classes A and B to worse than Class D in Stns. 2 and 5, from Class C to worse than Class D in Stn. 3, from Classes A and B to Class C in Stns. 4 and 11; and remained suitable for Class C in Stns. 6 and 14, and Classes A and B in Stns. 7, 9, 12 and 13. The quarterly

monitoring of lead, hexavalent chromium and cadmium in the lake and in the tributary rivers was not scheduled this month.


Overall Status


Remarks

Status worsened to Class C from Class B, with fecal coliform concentration at Class C

Class A status maintained, with BOD, %DO saturation, total coliform, fecal coliform, phosphate, and oil and grease levels at Class A

Status worsened to Class B from Class A, with fecal concentration at Class B

Status worsened to worse than Class D from Class C, with very high oil and grease concentration

Status worsened to Class C from Class B, with total coliform, fecal coliform, and oil and grease concentrations at Class C





Status improved to Class D from worse than Class D, with low % DO saturation and high total coliform concentration

Worse than Class D status maintained, with very high oil and grease concentration

Worse than Class D status maintained, with very high BOD , and oil and grease concentrations

Status improved to Class D from worse than Class D, high total coliform and phosphate concentrations

Worse than Class D status maintained, with very high oil and grease concentration

Class D status maintained, with low % DO saturation and high total coliform and phosphate concentrations










LAGUNA LAKE DEVELOPMENT AUTHORITY LAGUNA DE BAY MONTHLY WATER QUALITY STATUS REPORT OCTOBER 2009


OCTOBER 2009


Sampling Dates (Lake): 20 October 2009 Sampling Dates (Tributary): 13 October 2009


For this period, the BOD of the lake was at Classes A and B in Stns. I, II and V; and at Class C in Stns. IV and VIII. The tributary rivers' obtained water quality classifications for BOD were at Classes A and B in Stns. 1, 7, 8 10 and 15; at Class C in Stns. 2, 5, 9 and 14; and at worse than Class D in Stns. 4

and 6. In terms of % DO saturation, lake Stns. I, II, IV, V and VIII as well as lake Stns. 2, and 4 to 10 were found suitable for Classes A and B. COD

measurements were not carried-out this month.

Bacterial Pollution

For total coliforms, measured concentrations in lake Stns. I, II, IV and V passed the Classes A and B water quality criteria while in Stn. VIII, was within Class C. River Stns. 4 to 10 showed worse than Class C levels for total coliforms. Obtained water quality classifications for fecal coliforms in the lake were

Class A in Stns. I, II and IV, Class B in Stn. V and worse than Class B in Stn. VIII, whereas in river Stns. 4 to 10 were all at worse than Class B.




Euthropic Level

Measured dissolved nitrogen concentrations in the lake were low in Stns. I and IV, very low in Stns. II and VIII and medium in Stn. V. In the tributary rivers, the dissolved nitrogen levels were medium in Stns. 1, 5, 10 and 15, high in Stns. 2, 4, 6, 8 and 9, and very high in Stns. 7 and 14. The lake's

phosphate levels in Stns. I, II, IV V and VIII conformed to the Class A water quality criterion. The biological analyses of water samples from the lake for

chlorophyll-a and phytoplankton, and also the lake primary productivity measurements were not undertaken this month.


Hazardous Substance

This month's measured oil and grease levels in the lake were suitable for Classes A and B in Stns. I, II, IV, V and VIII. Monitored river stations for oil and grease showed the following water quality classifications: Class C in Stns. 2, 4 and 7, Class D in Stn. 5 and 14, and Classes A and B in Stns. 8, 9 and 15.

The quarterly monitoring for lead, hexavalent chromium and cadmium was not scheduled this month.


Overall Status


Remarks

Status at Class A, with BOD, %DO saturation, total coliform, fecal coliform, phosphate, and oil and grease levels at Class A

Status at Class A, with BOD, %DO saturation, total coliform, fecal coliform, phosphate, and oil and grease levels at Class A

Status at Class C, with BOD concentration at Class C

Status at Class B, with fecal coliform concentration at Class B

Status at Class C, with BOD, total coliform and fecal coliform concentrations at Class C





Status at Class B, with phosphate concentration at Class B

Status at Class C, with BOD and foil and grease concentrations at Class C


Status at worse than Class D with very high BOD concentration

Status at Class D, with high BOD, total coliform and phosphate concentrations

Status at worse than Class D, with very high BOD concentration

Status at Class D, with high total coliform and phosphate concentrations


Status at Class D, with high total coliform concentration





Status at Class D, with high phosphate, and oil and grease concentrations

Status at Class B, with phosphate concentration at Class B * Only listed parameters with DENR water quality criteria for freshwater systems have been included in the assessment of the overall status

LAGUNA LAKE DEVELOPMENT AUTHORITY LAGUNA DE BAY MONTHLY WATER QUALITY STATUS REPORT NOVEMBER 2009


NOVEMBER 2009


Sampling Dates (Lake): 16 November 2009 Sampling Dates (Tributary): 10 November 2009


The lake's BOD as compared to last month's map results showed that all stations yielded concentrations suitable for Classes A and B with Stns. IV and VIII's classifications notably improved from Class C to Classes A and B while Stns. I, II and V just maintained their classifications. The BOD levels in the

tributary rivers remained at Classes A and B in Stns. 1, 7, 8, 10 and 15, at Class C in Stn. 5, and at worse than Class D in Stn. 6; and improved from

Class C to Classes A and B in Stns. 2, 9 and 14, and from worse than Class D to Class D in Stn. 4. River Stns. 11 and 13's BOD were at Classes A and B. For % DO saturation, all lake stations remained suitable for Classes A and B. The tributary rivers maintained their previous month's water quality

classification at Classes A and B in Stns. 2 and 4 to 10. The % DO saturation map results for Stns. 11, 13, 14 and 15 were also at Classes A and B. COD

analysis for this month was not undertaken.

Bacterial Pollution

In comparison to last month's map results, lake Stns. I, II, IV and V continued to yield Classes A and B classification for total coliforms and in Stn. VIII, improved from Class C to Classes A and B. The total coliforms in the tributary rivers remained at worse than Class C in Stns. 4 to 10 while Stns 1, 2, 11,

13, 14 and 15, yielded worse than Class C classification. For fecal coliforms, last month's water quality classification at Class A in lake Stns. I, II and IV

and at worse than Class B in Stn. VIII were maintained this month while in Stn. V, improved from Class B to Class A. Last month's worse than Class B

classification for fecal coliform in the tributary rivers remained in Stns. 4 to 10. Obtained water quality classifications for fecal coliform in Stns. 1, 2, 11 ,13, 14 and 15 were also at worse than Class B this month.




Euthropic Level

Obtained dissolved nitrogen concentrations in the lake this month as compared to last month showed that Stns. I and V maintained their low levels while

in Stns. II and VIII, increased from very low to low and from very low to medium levels, respectively, and in Stn. V decreased from medium to low level. In the tributary rivers, the dissolved nitrogen levels remained high in Stn. 4, and medium in Stns. 5, 10 and 15. The dissolved nitrogen concentrations in

other river stations increased from medium to very high in Stn. 1; and decreased from high to medium in Stns. 2 and 9, from high to low in Stns. 6 and

8, and from very high to high in Stns. 7 and 14. River Stns.11 and 13 came out with low and medium dissolved nitrogen levels, respectively. The map results for phosphates in the monitored lake stations showed that Stns. I and V remained at Class A but in Stn. II, worsened from Class A to Class C and

in Stns. IV and VIII, also worsened from Class A to Class B. Measured phytoplankton counts in the lake this month were high in Sts. I and V, very low in

Stn. II, medium in Stn. IV and very high in Stn. VIII. Melosira sp. (diatom) was the most abundant phytoplankton organisms in the lake for this period.

Chlorophyll-a determination and lake primary productivity studies in the lake were not carried-out this month.


Hazardous Substance

The lake's oil and grease levels in the five (5) monitored stations maintained their Classes A and B classification when compared to last months map results. Measured oil and grease concentrations in the tributary rivers remained suitable for Class C in Stns. 2 and 4, at Class D in Stn. 5, and at Classes

A and B in Stns. 8, 9 and 15 whereas in Stns. 7 and 14, the water quality classifications improved from Class C to Classes A and B, and from Class D to

Classes A and B, respectively. River Stns. 1, 10 and 11 obtained the same water quality classifications at Classes A and B. For heavy metals, this month's quarterly monitoring of hexavalent chromium in the lake and in the tributary rivers was not undertaken. For lead and cadmium, measured concentrations

in all monitored lake and river stations were found suitable for Classes A, B and C.


Overall Status


Remarks

Class A status maintained, with BOD, %DO saturation, total coliform, fecal coliform, phosphate, oil and grease, lead and cadmium levels at

Class A

Status worsened to Class C from Class A, with phosphate concentration at Class C

Status improved to Class B from Class C, with phosphate concentration at Class B

Status improved to Class A from Class B, with BOD, %DO saturation, total and fecal coliform, phosphate, oil and grease, lead and cadmium

levels at Class A






Status worsened to Class D from Class B , with high total coliform and phosphate concentrations

Status worsened to Class D from Class B , with high total coliform and phosphate concentrations


Status improved to Class D from worse than Class D, high BOD, total coliform and phosphate concentrations


Worse than Class D status maintained, with very high BOD concentration









Status at Class D, with high total coliform and phosphate concentrations * Only listed parameters with DENR water quality criteria for freshwater systems have been included in the assessment of the overall status

LAGUNA LAKE DEVELOPMENT AUTHORITY LAGUNA DE BAY MONTHLY WATER QUALITY STATUS REPORT DECEMBER 2009

LAGUNA DE BAY MONTHLY WATER QUALITY STATUS REPORT DECEMBER 2009


Sampling Dates (Lake): 07 December 2009 Sampling Dates (Tributary): 01 December 2009


The BOD and % DO saturations concentrations obtained in the five (5) monitored lake stations, namely: Stns. I, II, IV, V and VIII, still remained suitable for Classes A and B when compared to last month's map results. In the tributary rivers, Stns. 1, 2, 7 to 10, 13 and 15 retained their previous month's

water quality classifications at Classes A and B for BOD along with Stn. 6 which maintained its classification at worse than Class D. In the other river stations, recorded classification for BOD for this month were: at worse than Class D in Stn. 3; improved from Class C to Classes A and B in Stn. 5; and

worsened from Class D to worse than Class D in Stns. 4 and from Classes A and B to Class C in Stn. 14. In terms of % DO saturation, Stns. 2, 4 to 10

and 13 to 15 continued to maintain their previous month's Classes A and B classification. River Stns.1 and 3's BOD was also suitable for Classes A and B.

The monitoring of COD in the lake and in the tributary rivers was again not undertaken during this period.

Bacterial Pollution

The map results for total coliforms this month showed that Stns. I, II, IV and V maintained their suitability for Classes A and B while in Stn. VIII, worsened from Classes A and B to Class C. In the tributary rivers, Stns. 1, 2, 4 to 10 and 13 to 15 retained their last month's worse than Class C

classifications for total coliforms with Stn. 3 also obtained the same classification. For fecal coliforms, lake Stns. I and IV remained suitable for Class A

while lake Stns. II and V's classifications worsened from Class A to worse than Class B and from Class B to worse than Class B, respectively. Lake Stn. VIII and river Stns. 1,2, 4 to 10, and 13 to 15 maintained their previous month's water quality classifications at worse than Class B with river Stn. 3 also

yielding the same classification.




Euthropic Level

Comparison of the obtained dissolved nitrogen levels this month with the previous month's observations in the lake showed the same low concentrations

in Stns. I, II and V while the concentrations decreased in Stn. IV from low to very low and in Stn. VIII from medium to low. In the tributary rivers, the dissolved nitrogen levels decreased from very high to medium in Stn.1, and from medium to low in Stns. 10 and 15; increased from medium to high in

Stn. 2, and from high to very high in Stn. 4; and remained at medium in Stns. 5, 9 and 13, low in Stns. 6 and 8, and high in Stns. 7 and 14. Recorded

dissolved nitrogen level in river Stn. 3 this month was very high. For phosphate, Stn. I remained suitable for Class A and Stn. VIII for Class B. The water quality classifications for phosphate in Stns. II and IV improved from Class C to Class B and from Class B to Class A, respectively but in Stn. V, worsened

from Class A to Class B. The phosphate levels in tributary rivers remained at worse than Class C Stns. 1, 2, 4 to 9, 13 and 14, and at Class B in Stn. 10;

and improved from worse than Class C to Class C in Stn. 15. The phytoplankton counts in the lake remained high in Stn. I; increased from very low to

high in Stn. II, and from high to very high in Stn. V; and decreased from medium to low in Stn. IV, and from very high to medium in Stn. VIII. Melosira sp. (diatom) was the most dominant phytoplankton organisms in all of the five (5) monitored lake stations. Chlorophyll-a determination and lake primary

productivity measurements were not undertaken this month.


Hazardous Substance

This month and last month's map results for oil and grease in the lake were exactly the same wherein Stns. I, II, IV, V and VIII obtained concentrations suitable for Classes A and B. In comparison to last month's map results, the water quality classifications for oil and grease in the tributary rivers

worsened from Classes A and B to Class D in Stns. 1 and 14; improved from Class C to Classes A and B in Stns. 2 and 4, and from Class D to Classes A

and B in Stns. 5 and 6; and remained at Classes A and B in Stns. 7 to 10, 13 and 15. For river Stn. 3, measured oil and grease concentration was at worse than Class D. The monitoring of lead and cadmium was also undertaken in the lake and the results of the analyses revealed that all measured

concentrations passed the water quality criteria for Classes A, B and C.


Overall Status


Remarks

Class A status maintained, with BOD, %DO saturation, total coliform, fecal coliform, phosphate, oil and grease, lead and cadmium levels at

Class A


Status improved to Class A from Class B, with BOD, %DO saturation, total coliform, fecal coliform, phosphate, oil and grease, lead and cadmium levels at Class A

Status worsened to Class B from Class A, with fecal coliform and phosphate concentrations at Class B

Class C status maintained, with total and fecal coliform concentrations at Class C





Class D status maintained, with high total coliform, phosphate, and oil and grease concentrations


Status at worse than Class D, with very high BOD, and oil and grease concentrations

Status worsened to worse than Class D from Class D, with very high BOD concentration


Worse than Class D status maintained, with very high BOD concentration








Class D status maintained, with high total coliform, phosphate, and oil and grease concentrations

Class D status maintained, with high total coliform concentration * Only listed parameters with DENR water quality criteria for freshwater systems have been included in the assessment of the overall status

Documents

LAGUNA DE BAY MONTHLY WATER QUALITY STATUS ...LAGUNA LAKE DEVELOPMENT AUTHORITY LAGUNA DE BAY MONTHLY WATER QUALITY STATUS REPORT JANUARY 2009 DENR Water Quality Criteria/ Water Usage