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Hutchins Lake 2015 Water Quality Report i| Page Technical Report Prepared for: Hutchins Lake Improvement Association c/o Mr. John Lerg 6757 High Meadow SW Byron Center, Michigan 49315 Kieser & Associates, LLC 536 East Michigan Ave, Suite 300 Kalamazoo, MI 49007 October 19, 2015 Hutchins Lake 2015 Water Quality Report

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Hutchins Lake 2015 Water Quality Report     i | P a g e   

Technical Report  

Prepared for:               Hutchins Lake Improvement Association c/o Mr. John Lerg 6757 High Meadow SW Byron Center, Michigan 49315 

 

                                    

Kieser & Associates, LLC 

536 East Michigan Ave, Suite 300 

Kalamazoo, MI 49007 

 

October 19, 2015 

HutchinsLake2015WaterQualityReport

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TableofContentsOVERVIEW ..................................................................................................................................................... 1 

WATER QUALITY SAMPLING APPROACH ...................................................................................................... 1 

Parameters ................................................................................................................................................ 1 

Total Phosphorus .................................................................................................................................. 2 

Nitrate‐Nitrogen ................................................................................................................................... 2 

Ammonia‐Nitrogen ............................................................................................................................... 2 

Alkalinity ............................................................................................................................................... 3 

Chlorides ............................................................................................................................................... 3 

Escherichia coli ...................................................................................................................................... 3 

Secchi Disk Transparency ...................................................................................................................... 3 

Dissolved Oxygen and Temperature ..................................................................................................... 3 

pH .......................................................................................................................................................... 4 

Conductivity .......................................................................................................................................... 4 

RESULTS ........................................................................................................................................................ 4 

Total Phosphorus ...................................................................................................................................... 5 

Nitrate‐Nitrogen ....................................................................................................................................... 5 

Ammonia‐Nitrogen ................................................................................................................................... 5 

Alkalinity ................................................................................................................................................... 6 

Chlorides ................................................................................................................................................... 6 

Escherichia coli .......................................................................................................................................... 6 

Secchi Disk Transparency .......................................................................................................................... 6 

Dissolved Oxygen and Temperature ......................................................................................................... 6 

pH .............................................................................................................................................................. 7 

Conductivity .............................................................................................................................................. 7 

RECOMMENDATIONS ................................................................................................................................... 7 

REFERENCES .................................................................................................................................................. 9 

FIGURES ...................................................................................................................................................... 10 

  

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OVERVIEWThe Hutchins Lake Improvement Association (HLIA) authorized Kieser & Associates, LLC (K&A) to conduct water quality sampling, data analysis and reporting on Hutchins Lake for 2015. This work is a continuation of assessments performed nearly annually from 1998-2014. The HLIA recognizes the utility of maintaining and building a long-term record of water quality on Hutchins Lake. Hutchins Lake is located in Allegan County, Michigan in Sections 1 and 12 of Ganges Township and Sections 6 and 7 of Clyde Township. The lake has a surface area of approximately 376 acres with one inlet at the headwaters of the North Branch Black River. The one lake outlet, to the Black River Drain, exits via a concrete sill at the south end of the lake. The residences on Hutchins Lake are all served by septic systems. Stormwater runoff enters the lake through roadway ditches and culverts, as well as direct overland flow. K&A conducted water quality sampling at a subset of previously monitored in-lake stations to evaluate the current conditions and identify potential sources of pollution. This report summarizes the sampling conducted, results and findings. The report also highlights recommendations for the HLIA based on the 2015 findings as well as from historical sampling.

WATERQUALITYSAMPLINGAPPROACHK&A was contracted to collect water samples from a select set of historically sampled lake locations. These samples were collected by K&A on August 17, 2015. Samples were collected from four in-lake surface locations: Site 1 (near the east boat launch), Site 4 (near the dam overflow), Site 8 (on the north end near the orchard) and Site 11 (over the deepest part of the lake). A sample also was collected near the lake bottom (30-ft depth) at Site 11 to determine conditions in the bottom waters during summer temperature stratification. In addition, one sample was collected at Site 7B, at the first turn within the Channel (see Figure 1; which, along with other report figures, appears after the reference section of this report and before appendices). Based on historic data, the variability among the sampling sites was not significant enough to justify the expense of sampling all previous sites. In addition, dry weather monitoring events typically will not show a great deal of variability among in-lake samples due to natural mixing by wind and waves between rain events. In order to determine sources of pollutants to the lake, a strategic wet-weather monitoring plan would be required. The samples collected from the in-lake surface sites and Channel were analyzed for total phosphorus (TP), nitrate-nitrogen (NO3), ammonia-nitrogen (NH3), total alkalinity, chlorides, and Escherichia. coli (E. coli). Field measurements of pH, conductivity, dissolved oxygen (DO) and temperature also were recorded. In addition, Secchi disc transparency was measured at Site 11. TP, NO3, NH3, pH, and conductivity were measured at Site 11 at the 30-ft depth. Additionally, DO and temperature were measured from the surface of Site 11 to the bottom at three foot intervals to determine a depth profile for these parameters. The TP, NO3, NH3, alkalinity, chloride and E. coli analyses were conducted at Bio-Chem Laboratories, Inc., in Grand Rapids, Michigan. Field parameters of pH, conductivity, DO, temperature and Secchi disc transparency were measured on-site by K&A staff.

ParametersA discussion of the water quality parameters examined in this study is provided here to illustrate the value of these measures with respect to water quality characterization.

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TotalPhosphorusBoth algae and aquatic plants require a wide range of nutrients for growth. The nutrient that typically is in shortest supply with respect to aquatic plant and algal growth needs is termed the “limiting nutrient”. This term implies that the relative unavailability of this particular nutrient will limit plant and algae growth. In most freshwater ecosystems, phosphorus historically has been the limiting nutrient. Therefore, increases in phosphorus likely will lead to increases in nuisance plant and algae growth. This is especially true for blue-green algal blooms. The form of phosphorus most often used for general assessments of lake water quality is TP. Measured concentrations of TP in lake water can be used to determine the trophic status of the lake based on scientific data compiled for other similar inland lakes. The term “trophic state” refers to the level of primary productivity (i.e., algal growth) in an aquatic system. The four trophic states are “oligotrophic,” “mesotrophic,”, “eutrophic” and “hypereutrophic.” These correspond to low, medium, high and extremely high levels of productivity, respectively. Trophic state values (based on Michigan Department of Natural Resources data) for TP are presented in Table 1. An additional point of reference for TP values in our region is the 2000 U.S. Environmental Protection Agency (USEPA) guidance document Ambient Water Quality Criteria Recommendations for Lakes and Reservoirs in Nutrient Ecoregion VII. While this TP value is just a recommendation at the current time, the draft criterion established in this EPA document is 0.01475 mg/L for protection of surface waters. Note that historic data for Hutchins Lake have been reported in mg/L. Data collected by K&A also are reported as mg/L for continuity (for example, 1 mg/L = 1,000 µg/L.) Table 1. Lake Trophic State and Classification Ranges-Based on Michigan Data (USGS, 2012)

Lake Trophic State TP (mg/L) Chlorophyll a (ug/L) Secchi Depth Transparency (ft) Oligotrophic <0.010 <2.2 >15 Mesotrophic 0.010-0.020 2.2-6 7.5-15

Eutrophic 0.021-0.050 6.1-22 3-7.5 Hypereutrophic >0.050 >22 <3

Nitrate‐NitrogenNitrogen is present in a number of different forms in a lake system. Inorganic nitrogen compounds are those most readily assimilated by aquatic plants and algae for growth. Nitrates (NO3) occur naturally in soil and water, though excess levels of nitrates can be considered a contaminant in both groundwater and surface waters. This form of nitrogen is readily utilized by plants and algae, promoting vegetative growth. Most sources of excess nitrates come from human activities. The source of excess nitrates usually can be traced to agricultural activities, human and animal wastes, or industrial pollution. Although excess nitrates usually are associated with some type of human activity, the source also can be naturally occurring. An example of a natural source is the presence of large numbers of birds living in or around a water body. Bird excretions that get into the water can create elevated nitrate levels. While NO3 criteria have not yet been developed in Michigan, draft criteria for Minnesota surface waters are proposed at 3.1 and 4.9 mg/L NO3 for chronic exposure (four day average concentration cannot be exceeded more than once in a three year period ) limits for cold and cool water communities, respectively (Minnesota Pollution Control Agency, 2010).

Ammonia‐NitrogenAmmonia-nitrogen is quickly taken up by algae and other aquatic plants. Ammonia levels can be higher in waters with low dissolved oxygen concentrations. When oxygen is present, the ammonia is quickly converted to nitrate by bacteria. Ammonia can be toxic to aquatic organisms under certain temperature

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and pH conditions. Higher pH and temperatures increase ammonia toxicity. Like nitrates, excess ammonia sources can be traced to agricultural activities, human wastes, or industrial pollution. The US Environmental Protection Agency (USEPA) ammonia criterion for freshwater is 1.9 mg/L for chronic exposure limits (USEPA, 2013).

AlkalinityAlkalinity is a measure of the acid-neutralizing or “buffering” capacity of water. The higher the alkalinity in a lake, the greater the resistance to a change in pH. Alkalinity commonly is influenced by carbonates (CO3

2-) and bicarbonates (HCO3-). Michigan inland lakes have recorded alkalinity values ranging

from less than 20 to 323 mg/L as calcium carbonate (CaCO3) (USGS, 2012).

ChloridesWhile chloride is a naturally occurring component of surface waters, human activities can result in increased concentrations. Increases in chloride concentrations may be indicative of pollutant inputs. Septic system effluent, animal wastes, fertilizers and road-salting chemicals can increase in-lake concentrations of chloride. Lakes in the southwest region of Lower Michigan have recorded chloride concentrations averaging <29 mg/L (USGS, 2012).

EscherichiacoliEscherichia coli (E. coli) is the indicator organism used by the Michigan Department of Environmental Quality (MDEQ) for its beach monitoring program (MDEQ, 2015). E. coli bacteria are found in the intestinal tract of warm-blooded animals, and laboratory detection methods for these bacteria are well-established. MDEQ beach monitoring criteria state that the daily mean (based on a minimum of three samples) for a beach sample must be less than 300 colony forming units (CFU) per 100 milliliters for the water to be considered safe for swimming. Additionally, the 30-day geometric mean must be less than 130 CFU per 100 milliliters (based on a minimum of five unique events, with at least three samples per event).

SecchiDiskTransparencySecchi disk transparency is the depth at which a Secchi disk (a flat white or black and white platter, approximately 20 centimeters in diameter) suspended into a lake disappears from the investigator's sight. In general, the greater depth at which the Secchi disk can be viewed, the lower the productivity of the water body. Secchi depth readings of greater than 15 feet can be indicative of oligotrophic conditions (USGS, 2012) (Table 1). It is, however, important to note that established populations of zebra mussels in a lake can significantly increase water clarity, thus resulting in deeper Secchi disk readings but not necessarily reflecting an oligitrophic status.

DissolvedOxygenandTemperatureA sufficient supply of DO in lake water is necessary for most forms of desirable aquatic life. Colder waters contain more dissolved oxygen than warmer waters. Oxygen depletion can occur in deeper, unmixed bottom waters during warmer summer months in highly productive lakes. Increased algal or plant growth associated with additional nutrients in the lake can lead to severe decreases in DO in lake bottom waters. This drop in oxygen is due, in part, to dead algae and other organic matter (such as rooted plant material broken away from shoreline areas and leaves, grass and other plant debris washed in from storm drains) settling to the bottom of the lake and decaying. This decay process is performed by organisms that consume oxygen, and by chemical reactions in the sediment. The DO impacts most often are observed in bottom waters during periods of temperature stratification in warmer summer months, and to a lesser degree, under winter ice cover conditions. Dissolved oxygen levels and temperature were measured by K&A at Hutchins Lake using a YSI ProODO dissolved oxygen meter calibrated to saturated air conditions prior to use. Michigan water quality

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standards for surface waters designated for warm water fish and aquatic life are 5 mg/L (MDEQ, 2006).

pHThe measure of hydrogen ion activity in a particular sample is expressed as the pH value. Waters with a pH value below 7.0 generally are considered acidic while values greater than 7.0 generally are described as basic or alkaline. Lakes typically experience a fluctuation in pH level during the course of a day as photosynthetic processes occur in rooted plants and algae during the daylight hours. These processes raise the pH (by removing CO2). Respiration processes occurring in the evening hours then lower pH (by producing CO2). Decomposition can also lower pH. Since pH is measured on a logarithmic scale, a change of one pH unit corresponds with a ten-fold change in hydrogen ion concentration. In addition to direct effects on biota, low pH values also can mobilize toxic metals that are otherwise bound to sediments under higher pH conditions. K&A measured pH using an Oakton pH Tester 30 probe. The probe was calibrated using appropriate standard solutions prior to use. Michigan Water Quality Standards state that the hydogen ion concentration expressed as pH shall be maintained within the range of 6.5 to 9.0 in all waters of the state (MDEQ, 2006).

ConductivityConductivity, or specific conductance, is the measure of the flow of electrons through water. This value relates to the total dissolved ion level, which essentially is a measure of dissolved salts present in a solution. Conductivity can serve as an indicator of septic system or road salt inputs. K&A measured conductivity at the Hutchins Lake sites with a Eutech Ectestr 11 handheld conductivity meter. In this study, conductivity is reported as specific conductance, the temperature-compensated conductivity measurement reported by the Eutech meter. Studies of inland fresh waters indicate that streams supporting a healthy assemblage of fish have a range between 150 and 500 umhos/cm (US EPA, 2015).

RESULTSResults from the August 17, 2015 K&A water quality sampling activities were compiled along with the available historic water quality data to continue a consistent record of Hutchins Lake water quality reporting. Graphs of select historic Hutchins Lake water quality data and 2015 K&A data are presented in Figures 2 through 8. August 17, 2015 data are presented in Table 2. A copy of the Bio-Chem Laboratory report for 2015 results is presented in Appendix A. The entire compilation of all historic water quality data is provided in Appendix B. Table 2. Results of August 17, 2015 Hutchins Lake Water Quality Sampling by K&A.

Sampling stations

Temp. (oC)

Secchi Depth

(ft) DO

(mg/L) Conductivity(umhos/cm)

pH (SU)

Total Phosphorus

(mg/L)

Ammonia-Nitrogen (mg/L)

Nitrate-Nitrogen(mg/L)

Alkalinity (mg/L)

Chlorides(mg/L)

E. coli(CFU)

1 27.3 -- 7.61 340 8.04 0.015 0.28 < 0.1 140 18 34

4 27.7 -- 8.08 340 8.21 0.015 0.38 < 0.1 140 17 < 1.0

7B 26.3 -- 5.86 400 7.59 0.041 0.88 < 0.1 170 15 24

8 26.3 -- 8.62 360 8.33 0.017 0.069 < 0.1 140 18 2

11 surface 27.1 8.5 8.66 350 8.24 0.015 0.21 < 0.1 140 17 2

11 bottom 13.7 -- 0.04 410 8 <0.01 0.8 < 0.1 -- -- --

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TotalPhosphorusTP data from 1998 to 2015 for Sites 1, 4, 7B, 8 and 11 (surface and bottom) are presented in Figure 2. TP concentrations for the August 17, 2015 in-lake surface samples (Sites 1, 4, 8 and 11) all were below 0.020 mg/L, corresponding to mesotrophic lake conditions. Site 7B, in the Channel, had higher TP levels, at 0.041 mg/L. Higher TP levels have been observed at Site 7B than at the other surface stations from 2013-2015. Decaying plant material and lack of circulation or flushing in these shallow waters may be contributing to the elevated TP levels in the channel. The lake bottom sample, taken at Site 11, had TP levels below the detection limit of 0.01 mg/L during this sampling event; the lowest measured value of TP of any of the samples during this sampling event. This is unusual for stratified lakes with oxygen depleted bottom waters. During periods of lake stratification (summer and winter), low dissolved oxygen levels in the bottom waters can cause sediment-bound phosphorus to become mobile and ultimately available for algal uptake upon fall and spring turnover. Historic Hutchins Lake monitoring data show that from 2001 to 2014, Site 11 bottom samples have consistently had higher TP levels than the Site 11 surface samples. There have been previous years where TP in bottom waters has also been relatively low, for example in 2002 and 2008. It is possible that the oxygen depletion that typically occurs under summer stratification occurs relatively slowly or late in the summer season in Hutchins Lake (a positive condition for lake water quality). This might also be expected for lakes that are mesotrophic. With such a condition, the sequence of events leading to elevated TP in bottom waters (as seen in other years such as 2004 and 2013) may simply have not yet occurred by the time of the 2015 sampling (i.e., dissolved oxygen depletion followed by increased sediment phosphorus release). Other than conditions noted above, no significant trends in TP could be detected for the surface samples or bottom samples over the collection period.

Nitrate‐NitrogenThe NO3 concentrations from the August 17, 2015 sampling were below the detection limit of 0.10 mg/L at all sites. These are denoted in Figure 3 which also show an upward trend from 2008 to 2011 at Sites 1, 4, 7B, 8 and 11 (surface and bottom) for NO3 data. The 2013-2015 data show a return to similar conditions observed in 2006. As reported in the 2011 Hutchins Lake report (Applied Analytical, 2011), the elevated nitrate concentrations detected during that sampling event might have been due to heavy rainfall prior to sampling. Nitrates can be present in high concentrations in stormwater runoff. Variations in measured concentrations also can be seen with algae and aquatic vegetation dying off at the end of the growing season.

Ammonia‐NitrogenAmmonia concentrations at all surface sampling sites were detected at elevated levels for the August 17, 2015 monitoring. Sites 1, 7B and 11surface had the highest NH3 levels yet recorded with values of 0.28, 0.88 and 0.21 mg/L, respectively. These 2015 data are plotted in Figure 4 with historic information from 1998-2014 for Sites 1, 4, 7B, 8 and 11 (surface and bottom). Site 11 bottom samples have displayed elevated NH3 concentrations in all the available data from 2001 to 2013, likely reflecting oxygen-depleted conditions. Site 4 had the highest level recorded since 2002 at 0.38 mg/L, and Site 8 had the highest recorded concentration since the 2011 monitoring at 0.69 mg/L. Site 11 bottom levels were detected at 0.8 mg/L, considered an average value (0.76 mg/L based on available data) for this parameter. A significant rainfall event occurred on August 14, 2015 with 0.62 inches of rain measured at the Fennville, MI Michigan State University weather station1. The elevated NH3 levels observed in the

                                                            1 http://enviroweather.msu.edu/weather.php?stn=fev 

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August 17, 2015 samples may be the result of stormwater runoff impacts from nearby agricultural production and/or saturated septic system drainfields. While these concentrations certainly warrant continued monitoring, it is important to note that sampling events represent one isolated point in time. Evaluation and continuation of the long-term historic database allow for the detection of emerging trends in water quality.

AlkalinityAlkalinity was consistent at 140 mg/L at the in-lake surface sites (1, 4, 8 and 11) for the August 17, 2015 monitoring. Site 7B, in the Channel, displayed slightly higher alkalinity levels of 170 mg/L during the 2015 monitoring. The Channel historically has had higher detected alkalinity levels, as presented in Figure 5. Alkalinity levels detected during the 2015 monitoring are representative of moderately-hard water conditions.

ChloridesChloride levels for the 2015 surface samples all were detected at 18 mg/L or less. A slight upward trend in chloride concentrations can be observed in the 1998 to 2015 data set presented in Figure 6, though there may be cyclical patterns that could be tied to wet and dry decadal rainfall cycles. These increasing values could be a result of more road salting in the roadways within the Hutchins Lake watershed, or potentially from increasing septic system contributions. Chlorides are considered “conservative” pollutants in that they are not influenced by chemistry or biology. Thus, they can represent a ‘marker’ or indicator of certain pollution sources, particularly when there are increasing concentration trends being observed.

EscherichiacoliE. coli bacteria was noted in four of the five surface samples during the August 2015 sampling. The highest count was 34 CFUs. This is well below the MDEQ beach monitoring criteria of 130 CFU/100 mL. Sites 1 (boat launch area) and 7B (Channel) displayed the highest E. coli levels at 34 and 24 CFU/100 mL, respectively, while the other in-lake surface samples were measured at 2 CFU/100 mL or less during the August 2015 monitoring. Historic bacteria data from 1998 to 2015 are presented in Appendix B.

SecchiDiskTransparencySecchi depths recorded at Site 11 during the annual monitoring are presented in Figure 7. Based on these data, water transparency appears to have generally improved from early monitoring in the late 1990s (from 6 feet Secchi measurements) through a peak level of transparency of almost 13 feet in 2009. Since 2009, Secchi depths have leveled off ranging from about 8-10 feet since 2011. Transparency can fluctuate greatly from storm events (turbid waters due to runoff and mixing), algal growth, wind conditions and sun angle. Zebra mussels in a lake system also have been shown to increase water clarity over time.

DissolvedOxygenandTemperatureThe DO concentrations for the August 17, 2015 monitoring were at 7.61 mg/L or greater for the in-lake surface samples and at 5.86 mg/L in the Channel sample. The Site 11 bottom sample was detected at 0.04 mg/L during this monitoring event. Temperatures ranged between 26.3 to 27.7 ˚C for the in-lake surface sites and the Channel site. The lake bottom temperature at Site 11 was recorded at 13.7 ˚C during this event. Historic DO data from 1998 to 2015 are presented in Appendix B. DO and temperature were recorded at three foot intervals to create a profile at the deepest in-lake location, Site 11, during the August 2015 sampling. Figure 8 shows that DO levels were greater than 5 mg/L above 21 feet. The DO levels decreased below 21 feet and were measured near 0 mg/L below 27 feet. Temperatures also steadily decreased below 21 feet of depth to a recorded low of 13.7 ˚C at 33 feet,

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indicating strong thermal stratification. Compiled data from previous water quality reports (provided by the HLIA) from 1998-2005 showed oxygen-depleted conditions in the bottom waters at Site 11, generally below 20 feet, during the summer monitoring. More recent K&A data from 2013 and 2014, however, show oxygen remaining above 3 mg/L in the bottom waters during the late summer monitoring. This latter condition provides greater bottom water aquatic habitat conditions, and a reduced likelihood of accelerated phosphorus and nitrogen release from the sediments. Historically recorded DO conditions in surface waters during 1998 and 2001 are suspected to be related to water quality impacts possibly associated with aquatic nuisance plant treatments. If there are significant amounts of decomposing plant materials in the water column, DO is consumed by bacterial decomposition of these organic materials.

pHValues of pH for the August 2105 monitoring for all sites were within the acceptable range for aquatic organisms ranging from 7.59 to 8.33 S.U. Historic pH data from 1998 to 2015 are presented in Table 2.

ConductivitySites 1, 4, 8 and 11 (surface) had conductivity levels from 340 to 360 µmhos/cm during the August 2015 sampling event. Sites 7B and 11 (bottom) had conductivity levels of 400 and 410 µmhos/cm, respectively during this monitoring event. While these values are typical of conductivity levels observed in Hutchins Lake during past monitoring, the levels are generally trending upward based on historic data. Historic conductivity data from 1998 to 2015 are presented in Appendix B.

RECOMMENDATIONSK&A provides here, recommendations for future monitoring consistent with the 2015 reporting where the Hutchins Lake Board has already approved some form of these for 2016 sampling.  

1. Expand water quality monitoring program. Additional monitoring during the spring turnover period is recommended to gain an understanding of the lake system during mixing events. This is important in order to determine nutrient availability for algae and plant uptake during the summer growing season. Additional monitoring will help to determine if internal nutrient loading is a concern for Hutchins Lake water quality. K&A also recommends that the HLIA provide any 2016 aquatic herbicide treatment information regarding treatment dates, chemicals and quantities used, and treatment maps to better understand dissolved oxygen fluctuations in the lake. Future K&A reporting will include plots of % oxygen saturation to examine whether in lake conditions are causing less than saturated dissolved oxygen levels.

The Hutchins Lake Board has contracted with Kieser & Associates to add spring water quality monitoring and to continue the summer water quality monitoring for 2016.

Wet weather monitoring also is recommended to help identify the sources of pollutants to Hutchins Lake. The elevated NH3 levels detected in the surface samples during the August 2015 monitoring suggest potential stormwater or septic drainfield nutrient loading. There are a number of storm drains connected to the lake and all residents are served by onsite septic systems. Dry weather monitoring alone cannot detect pollutant contributions from these storm drains or septic additions. Stormwater samples collected during a rain event can help identify potential problem areas and allow for targeted improvement efforts. Without these data, watershed improvement methods may be ineffective.

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2. Collect lake bottom sediments for nutrient analysis. Historic elevated nutrient levels in the bottom waters at Site 11 indicate nutrient-enriched sediments in Hutchins Lake. Sediment grab samples from the deep basin of the lake should be analyzed for nutrients to further understand the internal nutrient loading to the lake.

The Hutchins Lake Board has contracted with Kieser & Associates to conduct both spring and summer sediment quality monitoring for 2016.

3. Implement a purple loosestrife management plan. Purple loosestrife has been noted on the

shoreline of Hutchins Lake. This invasive species can quickly crowd out native vegetation and create a monoculture. An assessment of current conditions with management options should be implemented.

The Hutchins Lake Board has contracted with Kieser & Associates to conduct an assessment of purple loosestrife distribution around the shoreline with management recommendations for 2016.

4. Collect chlorophyll a samples during the spring and summer 2016 Water Quality

Monitoring. Chlorophyll a is a measure of the active green pigment in plants that allows them to photosynthesize. Chlorophyll a monitoring is a way to indirectly measure the amount of algae or phytoplankton in a lake water sample. Algae growth can be stimulated by excess nutrient (typically phosphorus and nitrogen) levels in a lake. While some algae are necessary and desirable for a healthy lake ecosystem, nuisance algal blooms can create conditions that inhibit recreation and aesthetics and create potentially harmful conditions for humans and pets. Determining the level of chlorophyll a (and therefore the amount of algae) in the lake will help with water quality data interpretation for other parameters being collected and provide an important basis for examining long-term trends.

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REFERENCESApplied Analytical Laboratories. 2011. “Hutchins Lake Annual Analysis.” Applied Analytical Laboratories. 2009. “Hutchins Lake Annual Analysis.” Applied Analytical Laboratories. 2008. “Hutchins Lake Annual Analysis.” Applied Analytical Laboratories. 2006. “Hutchins Lake Annual Analysis.” Applied Analytical Laboratories. 2005. “Hutchins Lake Annual Analysis.” Applied Analytical Laboratories. 2004. “Hutchins Lake Annual Analysis.” Applied Analytical Laboratories. 2004. “Hutchins Lake Annual Analysis.” Applied Analytical Laboratories. 2002. “Hutchins Lake Annual Analysis.” Applied Analytical Laboratories. 2001. “Hutchins Lake Annual Analysis.” Applied Analytical Laboratories. 1998. “Hutchins Lake Annual Analysis.” Kieser & Associates. 2014. “Hutchins Lake 2014 Water Quality Report.” Kieser & Associates. 2013. “Hutchins Lake 2013 Water Quality Report.” Michigan Department of Environmental Quality, Water Resources Division. June 2015. “Staff Report

Michigan Beach Monitoring Year 2014 Annual Report.” MI/DEQ/WRP-15/022 . Michigan Department of Environmental Quality. 2006. “Part 4-Water Quality Standards.” Water

Bureau, Water Resources Protection. Michigan Department of Natural Resources and Environment. 2009. “Hutchins Lake, Status of the

Fishery Resource.” 2009-63. Minnesota Pollution Control Agency. 2010. “Developing Surface Water Nitrate Standards and Strategies

for Reducing Nutrient Loading.” WQ-S6-23. US Environmental Protection Agency, 2015. “Water: Monitoring and Assessment, 5.9 Conductivity.”

http://water.epa.gov/type/rsl/monitoring/vms59.cfm US Environmental Protection Agency. 2013. “Aquatic Life Ambient Water Quality Criteria for

Ammonia – Freshwater.” EPA-822-R-13-001, April 2013.

US Environmental Protection Agency. December 2000. “Ambient Water Quality Criteria Recommendations. Lakes and Reservoirs in Ecoregion VII.” EPA 822-B-00-009.

US Geological Survey. 2012. “Water Quality Characteristics of Michigan’s Inland Lakes, 2001-10.”

Scientific Investigations Report 2011–5233.

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FIGURESResults from the August 17, 2015 K&A water quality sampling activities

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Figure 1. Hutchins Lake Map with 2015 Sampling Site Coordinates

Hutchins Lake water quality sampling sites and corresponding GPS coordinates, August 17, 2015

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0

0.02

0.04

0.06

0.08

0.1

0.12

0.14

0.16

0.18

0.2

Total phosphorus

(mg/L)

Figure 2. Hutchins Lake 1998-2015 Total Phosphorus for Sites 1, 4, 7B, 8 and 11

Site 1

Site 4

Site 7B

Site 8

Site 11 Surface

Site 11 bottom

* ** * * * * **

* denotes concentrationsbelow the laboratory

detection  limit

*

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0

0.2

0.4

0.6

0.8

1

1.2

1.4

1.6

1.8

2Nitrate‐Nitrogen

(mg/L)

Figure 3. Hutchins Lake 1998-2015 Nitrate-Nitrogen for Sites 1, 4, 7B, 8 and 11

Site 1

Site 4

Site 7B

Site 8

Site 11 Surface

Site 11 bottom

* All 2013‐2015concentrations 

below the laboratorydetection limit

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0

0.2

0.4

0.6

0.8

1

1.2

1.4

1.6

1.8

2Ammonia‐Nitrogen 

(mg/L)

Figure 4. Hutchins Lake 1998-2015 Ammonia-Nitrogen for Sites 1, 4, 7B, 8 and 11

Site 1

Site 4

Site 7B

Site 8

Site 11 surface

Site 11 bottom

* Denotes concentrations below   the  laboratory

detection  limit 

***** **************

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0

50

100

150

200

250

Alkalinity 

(mg/L)

Figure 5. Hutchins Lake 1998-2015 Alkalinity for Sites 1, 4, 7B, 8 and 11

Site 1

Site 4

Site 7B

Site 8

Site 11 surface

Site 11 bottom

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0

2

4

6

8

10

12

14

16

18

20

Chloride

smg/L

Figure 6. Hutchins Lake 1998-2015 Chlorides for Sites 1, 4, 7B, 8 and 11

Site 1

Site 4

Site 7B

Site 8

Site 11

Hutchins Lake 2015 Water Quality Report           17 | P a g e   

0

2

4

6

8

10

12

14

7/16/1998 7/7/2000 8/3/2001 8/6/2002 7/29/2003 9/1/2004 8/17/2005 8/16/2006 7/12/2008 9/1/2009 8/23/2011 8/20/2013 7/30/2014 8/17/2015

Secchi Dep

th 

(ft)

Figure 7. Hutchins Lake 1998-2015 Secchi Depth for Site 11

Hutchins Lake 2015 Water Quality Report           18 | P a g e   

0

5

10

15

20

25

30

35

0 5 10 15 20 25 30

Depth (ft)

Dissolved Oxygen (mg/L) or Temperature (oC)

Figure 8. Hutchins Lake August 2015 Dissolved Oxygen and Temperature Profiles

DO 

Temp

Hutchins Lake 2015 Water Quality Report    Appendix A 1 | P a g e   

Appendix A

Bio-Chem Laboratory Analytical Results

25-Aug-15Date:BIO-CHEM Laboratories, Inc.

Project: Hutchins LakeCLIENT: Kieser & Associates

Lab Order: 1508048Work Order Sample Summary

Lab Sample ID Client Sample ID Collection DateMatrix Date Received

1508048-01A Hutchins Site 1 8/17/2015Aqueous 8/17/20151508048-02A Hutchins Site 4 8/17/2015Aqueous 8/17/20151508048-03A Hutchins Site 7B 8/17/2015Aqueous 8/17/20151508048-04A Hutchins Site 8 8/17/2015Aqueous 8/17/20151508048-05A Hutchins Site 11S 8/17/2015Aqueous 8/17/20151508048-06A Hutchins Site 11D 8/17/2015Aqueous 8/17/2015

Page 1 of 1

25-Aug-15Date:BIO-CHEM Laboratories, Inc.

Project: Hutchins LakeCLIENT: Kieser & Associates

Lab Order: 1508048CASE NARRATIVE

Samples are routinely analyzed using methods outlined in the following references:

(SW) Test Methods for Evaluating Solid Waste, Physical/Chemical Methods, SW846, 3rd Ed.(E) Methods for Chemical Analysis of Water and Wastes, EPA-600/4-79-020.(A) Standard Methods for the Examination of Water and Wastewater, APHA, 18th Ed.(D) Annual Book of ASTM Standards.

Specific methods utilized for this project are provided in the analytical report and are identified by the reference document abbreviation ( ) followed by the method number.

All QA/QC and sample analyses met method, laboratory and/or regulatory data quality objectives unless otherwise specified below.

__________________________________________________________________________________

No data qualifications required.

Page 1 of 1

Project: Hutchins Lake

Project Number: N/A

Collection Date: 8/17/2015Matrix: AQUEOUS

Analyses Method Ref. Result Units DatePQL

CLIENT: Kieser & AssociatesLab Order: 1508048

Lab Sample ID: 1508048-01A

DF

BIO-CHEM Laboratories, Inc. Date: 8/25/2015

Client Sample ID: Hutchins Site 1

AnalystQ

ANALYTICAL REPORT

Anions by Ion ChromatographyChloride 8/18/20150.50 mg/L 118E300.0 RHS 1.Nitrogen, Nitrate (As N) 8/18/20150.10 mg/L 1< 0.10E300.0 RHS 2.

Coliform by Membrane FiltrationEscherichia Coli 8/17/20151.0 CFU/100 mL 134H10029 SCL 1.

Alkalinity by TitrationAlkalinity, Total (As CaCO3) 8/19/20152.0 mg/L 1140E310.1 BDW 1.

Ammonia NitrogenNitrogen, Ammonia (As N) 8/24/20150.025 mg/L 10.28E350.3 RHS 1.

Phorphorus by UV/VIS Spec.Phosphorus, Total (As P) 8/21/20150.010 mg/L 10.015E365.3 RHS 1.

DF - Dilution FactorPQL - Practical Quantitation Limit J - Detected below PQL but above MDL: Estimated

S - Spike Recovery Outside Acceptance LimitsB - Analyte detected in associated Method Blank

1 of 6

Definitions:

This report shall not be reproduced except in full, without the written approval of BIO-CHEM Laboratories, Inc.

Qualifiers (Q):

N - See case narrative for explanation

Note: The sample results reported are based on the sample aliquot(s) tested.

Project: Hutchins Lake

Project Number: N/A

Collection Date: 8/17/2015Matrix: AQUEOUS

Analyses Method Ref. Result Units DatePQL

CLIENT: Kieser & AssociatesLab Order: 1508048

Lab Sample ID: 1508048-02A

DF

BIO-CHEM Laboratories, Inc. Date: 8/25/2015

Client Sample ID: Hutchins Site 4

AnalystQ

ANALYTICAL REPORT

Anions by Ion ChromatographyChloride 8/18/20150.50 mg/L 117E300.0 RHS 1.Nitrogen, Nitrate (As N) 8/18/20150.10 mg/L 1< 0.10E300.0 RHS 2.

Coliform by Membrane FiltrationEscherichia Coli 8/17/20151.0 CFU/100 mL 1< 1.0H10029 SCL 1.

Alkalinity by TitrationAlkalinity, Total (As CaCO3) 8/19/20152.0 mg/L 1140E310.1 BDW 1.

Ammonia NitrogenNitrogen, Ammonia (As N) 8/24/20150.025 mg/L 10.38E350.3 RHS 1.

Phorphorus by UV/VIS Spec.Phosphorus, Total (As P) 8/21/20150.010 mg/L 10.015E365.3 RHS 1.

DF - Dilution FactorPQL - Practical Quantitation Limit J - Detected below PQL but above MDL: Estimated

S - Spike Recovery Outside Acceptance LimitsB - Analyte detected in associated Method Blank

2 of 6

Definitions:

This report shall not be reproduced except in full, without the written approval of BIO-CHEM Laboratories, Inc.

Qualifiers (Q):

N - See case narrative for explanation

Note: The sample results reported are based on the sample aliquot(s) tested.

Project: Hutchins Lake

Project Number: N/A

Collection Date: 8/17/2015Matrix: AQUEOUS

Analyses Method Ref. Result Units DatePQL

CLIENT: Kieser & AssociatesLab Order: 1508048

Lab Sample ID: 1508048-03A

DF

BIO-CHEM Laboratories, Inc. Date: 8/25/2015

Client Sample ID: Hutchins Site 7B

AnalystQ

ANALYTICAL REPORT

Anions by Ion ChromatographyChloride 8/18/20150.50 mg/L 115E300.0 RHS 1.Nitrogen, Nitrate (As N) 8/18/20150.10 mg/L 1< 0.10E300.0 RHS 2.

Coliform by Membrane FiltrationEscherichia Coli 8/17/20151.0 CFU/100 mL 124H10029 SCL 1.

Alkalinity by TitrationAlkalinity, Total (As CaCO3) 8/19/20152.0 mg/L 1170E310.1 BDW 1.

Ammonia NitrogenNitrogen, Ammonia (As N) 8/24/20150.025 mg/L 10.88E350.3 RHS 1.

Phorphorus by UV/VIS Spec.Phosphorus, Total (As P) 8/21/20150.010 mg/L 10.041E365.3 RHS 1.

DF - Dilution FactorPQL - Practical Quantitation Limit J - Detected below PQL but above MDL: Estimated

S - Spike Recovery Outside Acceptance LimitsB - Analyte detected in associated Method Blank

3 of 6

Definitions:

This report shall not be reproduced except in full, without the written approval of BIO-CHEM Laboratories, Inc.

Qualifiers (Q):

N - See case narrative for explanation

Note: The sample results reported are based on the sample aliquot(s) tested.

Project: Hutchins Lake

Project Number: N/A

Collection Date: 8/17/2015Matrix: AQUEOUS

Analyses Method Ref. Result Units DatePQL

CLIENT: Kieser & AssociatesLab Order: 1508048

Lab Sample ID: 1508048-04A

DF

BIO-CHEM Laboratories, Inc. Date: 8/25/2015

Client Sample ID: Hutchins Site 8

AnalystQ

ANALYTICAL REPORT

Anions by Ion ChromatographyChloride 8/18/20150.50 mg/L 118E300.0 RHS 1.Nitrogen, Nitrate (As N) 8/18/20150.10 mg/L 1< 0.10E300.0 RHS 2.

Coliform by Membrane FiltrationEscherichia Coli 8/17/20151.0 CFU/100 mL 12.0H10029 SCL 1.

Alkalinity by TitrationAlkalinity, Total (As CaCO3) 8/19/20152.0 mg/L 1140E310.1 BDW 1.

Ammonia NitrogenNitrogen, Ammonia (As N) 8/24/20150.025 mg/L 10.069E350.3 RHS 1.

Phorphorus by UV/VIS Spec.Phosphorus, Total (As P) 8/21/20150.010 mg/L 10.017E365.3 RHS 1.

DF - Dilution FactorPQL - Practical Quantitation Limit J - Detected below PQL but above MDL: Estimated

S - Spike Recovery Outside Acceptance LimitsB - Analyte detected in associated Method Blank

4 of 6

Definitions:

This report shall not be reproduced except in full, without the written approval of BIO-CHEM Laboratories, Inc.

Qualifiers (Q):

N - See case narrative for explanation

Note: The sample results reported are based on the sample aliquot(s) tested.

Project: Hutchins Lake

Project Number: N/A

Collection Date: 8/17/2015Matrix: AQUEOUS

Analyses Method Ref. Result Units DatePQL

CLIENT: Kieser & AssociatesLab Order: 1508048

Lab Sample ID: 1508048-05A

DF

BIO-CHEM Laboratories, Inc. Date: 8/25/2015

Client Sample ID: Hutchins Site 11S

AnalystQ

ANALYTICAL REPORT

Anions by Ion ChromatographyChloride 8/18/20150.50 mg/L 117E300.0 RHS 1.Nitrogen, Nitrate (As N) 8/18/20150.10 mg/L 1< 0.10E300.0 RHS 2.

Coliform by Membrane FiltrationEscherichia Coli 8/17/20151.0 CFU/100 mL 12.0H10029 SCL 1.

Alkalinity by TitrationAlkalinity, Total (As CaCO3) 8/19/20152.0 mg/L 1140E310.1 BDW 1.

Ammonia NitrogenNitrogen, Ammonia (As N) 8/24/20150.025 mg/L 10.21E350.3 RHS 1.

Phorphorus by UV/VIS Spec.Phosphorus, Total (As P) 8/21/20150.010 mg/L 10.015E365.3 RHS 1.

DF - Dilution FactorPQL - Practical Quantitation Limit J - Detected below PQL but above MDL: Estimated

S - Spike Recovery Outside Acceptance LimitsB - Analyte detected in associated Method Blank

5 of 6

Definitions:

This report shall not be reproduced except in full, without the written approval of BIO-CHEM Laboratories, Inc.

Qualifiers (Q):

N - See case narrative for explanation

Note: The sample results reported are based on the sample aliquot(s) tested.

Project: Hutchins Lake

Project Number: N/A

Collection Date: 8/17/2015Matrix: AQUEOUS

Analyses Method Ref. Result Units DatePQL

CLIENT: Kieser & AssociatesLab Order: 1508048

Lab Sample ID: 1508048-06A

DF

BIO-CHEM Laboratories, Inc. Date: 8/25/2015

Client Sample ID: Hutchins Site 11D

AnalystQ

ANALYTICAL REPORT

Anions by Ion ChromatographyNitrogen, Nitrate (As N) 8/18/20150.10 mg/L 1< 0.10E300.0 RHS 1.

Ammonia NitrogenNitrogen, Ammonia (As N) 8/24/20150.025 mg/L 10.8E350.3 RHS 1.

Phorphorus by UV/VIS Spec.Phosphorus, Total (As P) 8/21/20150.010 mg/L 1< 0.010E365.3 RHS 1.

DF - Dilution FactorPQL - Practical Quantitation Limit J - Detected below PQL but above MDL: Estimated

S - Spike Recovery Outside Acceptance LimitsB - Analyte detected in associated Method Blank

6 of 6

Definitions:

This report shall not be reproduced except in full, without the written approval of BIO-CHEM Laboratories, Inc.

Qualifiers (Q):

N - See case narrative for explanation

Note: The sample results reported are based on the sample aliquot(s) tested.

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Hutchins Lake 2015 Water Quality Report    Appendix B 1 | P a g e   

Appendix B

Hutchins Lake Historic Water Quality Data

                   

Sampling

stations Date

Temp.

(oC)

Secchi

Depth (ft)

DO

(mg/L)

Conductivity

(umhos/cm)

pH

(SU)

Total

Phosphorus

(mg/L)

Ammonia-N

(mg/L)

Nitrate-N

(mg/L)

Total Nitrogen

(mg/L)

Alkalinity

(mg/L)

Chlorides

(mg/L)

Coliform

(CFU)

E. coli

(CFU)

Total

Dissolved

Solids

mg/L)

Chlorophyll a

(u g/L)

1 7/16/1998 25 5.8 280 7.8 <.01 0.12 0.39 114 17 0

1A 7/16/1998

2 7/16/1998 25.2 6.8 284 7.6 0.01 0.09 0.36 112 16 0

3 7/16/1998 26.1 6.9 284 8.2 0.01 0.1 0.36 122 16 0

4 7/16/1998 25.9 6.4 305 8.1 0.03 0.09 0.32 122 16 0

5 7/16/1998 25.7 6.4 306 8.1 <.01 0.06 0.33 124 16 0

6 7/16/1998 25.6 6.9 303 8.1 0.03 0.06 0.32 122 16 0

7 7/16/1998 7.2 303 8.2 0.02 0.07 0.32 122 16 9

7A 7/16/1998

7B 7/16/1998

7C 7/16/1998

8 7/16/1998 25.9 6.9 305 8.1 0.03 0.07 0.35 126 15 3

9 7/16/1998

10 7/16/1998

11 7/16/1998

11A 7/16/1998 26.1 6 6.8 305 8.2 0.01 0.07 0.37 116 16 0

11B 7/16/1998 25.9 7.4

11C 7/16/1998 24.1 6.2

11D 7/16/1998 18.3 <1.0

12 7/16/1998

13 7/16/1998

1 7/7/2000

1A 7/7/2000

2 7/7/2000

3 7/7/2000

4 7/7/2000

5 7/7/2000

6 7/7/2000

7 7/7/2000

7A 7/7/2000

7B 7/7/2000

7C 7/7/2000

8 7/7/2000

9 7/7/2000

10 7/7/2000

11 7/7/2000 30.7 N/A 8.9 355 8.4 0.031 6.9 123 208

11A 7/7/2000

11B 7/7/2000

11C 7/7/2000

11D 7/7/2000

12 7/7/2000

13 7/7/2000

1 8/3/2001 22 4.4 300 7.5 0.04 0.06 0.34 41 15 39

1A 8/3/2001

2 8/3/2001 22 4 335 7.6 0.03 0.06 2.31 41 20 37

3 8/3/2001 22.8 4.4 300 7.9 0.01 0.06 0.28 41 15 0

4 8/3/2001 23 5.4 295 8.2 0.02 0.06 0.27 40 15 6

5 8/3/2001 22.5 4.2 300 8 0.01 0.05 0.26 42 15 3

6 8/3/2001 22.5 4.6 295 8 0.02 0.03 0.27 42 15 4

7 8/3/2001 22.5 4.8 295 8.1 0.02 0.03 0.26 41 15 1

7A 8/3/2001

7B 8/3/2001

7C 8/3/2001

8 8/3/2001 22.5 4.3 300 8 0.03 0.03 0.3 42 15 9

9 8/3/2001

10 8/3/2001

11 8/3/2001

11A 8/3/2001 23 7 4.8 300 8.1 0.01 0.02 0.26 41 15 1

11B 8/3/2001 22 4.2 300 8.1 0.02 0.02 0.29 41 15 NA

11C 8/3/2001 15 0 340 7.6 0.05 0.24 0.26 50 14 NA

11D 8/3/2001 12 0 370 7.6 0.04 1.13 0.36 56 11 NA

12 8/3/2001

13 8/3/2001

1 8/6/2002 20 9.4 354 8.6 <.01 0.13 0.27 136 13 0

1A 8/6/2002 19 4.8 367 7.9 0.02 0.24 1.1 140 14 0

2 8/6/2002 20 10.4 333 8.6 <.01 0.13 0.27 129 12 1

3 8/6/2002 21 10.4 330 8.7 <.01 0.14 0.28 134 12 0

4 8/6/2002 20 10.4 330 8.6 0.06 0.6 0.35 214 13 20

5 8/6/2002 20 10.4 322 8.6 0.01 0.18 0.28 131 12 0

6 8/6/2002 21 10.6 326 8.7 <.01 0.13 0.29 134 12 0

7 8/6/2002 21 10.6 335 8.7 0.05 0.16 0.29 132 9.4 1

7A 8/6/2002

7B 8/6/2002

7C 8/6/2002

8 8/6/2002 22 10.6 324 8.7 <.01 0.14 0.29 133 11 1

9 8/6/2002

10 8/6/2002

11 8/6/2002

11A 8/6/2002 22 4.5 10.6 329 8.7 <.01 0.12 0.3 134 13 0

11B 8/6/2002 21 10.2 327 8.7 <.01 0.14 0.28 135 11 NA

11C 8/6/2002 20 0 357 7.7 <.01 0.22 0.29 151 11 NA

11D 8/6/2002 11 0 396 7.6 0.02 0.8 0.3 168 9.4 NA

12 8/6/2002

13 8/6/2002

1 7/29/2003 19 11.3 322 7.7 0.15 0.07 0.23 126 17

1A 7/29/2003 17.5 2.9 335 7.4 0.03 0.06 0.26 129 15

2 7/29/2003 19 10.2 328 7.7 <0.01 0.06 0.25 125 16

3 7/29/2003 20 10.6 330 7.8 <.01 0.05 0.26 125 16

4 7/29/2003 19 10.6 330 7.8 0.02 0.04 0.28 120 17

5 7/29/2003

6 7/29/2003 19.5 10.3 330 7.9 0.02 0.1 0.26 128 17

7 7/29/2003 19 11 325 7.9 0.02 0.05 0.23 122 16

7A 7/29/2003 18 8.8 398 7.4 0.04 0.06 0.36 158 15

7B 7/29/2003 18.5 8.6 NA NA NA NA NA NA NA

7C 7/29/2003 19 6.8 440 NA 0.04 0.05 0.37 16 16

8 7/29/2003 19.5 10.6 330 8 0.05 0.04 0.39 15 15

9 7/29/2003

10 7/29/2003

11 7/29/2003

11A 7/29/2003 20 6.5 10.4 325 8 0.02 0.04 0.4 122 16 7.45

11B 7/29/2003 325 8 0.02 0.04 0.39 123 16

11C 7/29/2003 331 7.7 0.02 0.05 0.31 126 14

11D 7/29/2003 378 7.1 0.03 0.72 0.27 150 14

12 7/29/2003

13 7/29/2003

1 9/1/2004 8.2 0.08 N 0.2 2

1A 9/1/2004 8.1 0.03 0.05 0.16 3

2 9/1/2004 8.3 0.01 NA 0.1 1

3 9/1/2004 8.3 <.01 NA 0.12 NA

4 9/1/2004 8.3 0.05 NA 0.26 0

5 9/1/2004

6 9/1/2004 8.4 <.01 NA 0.2 2

7 9/1/2004 8.3 <.01 NA 0.42 1

7A 9/1/2004 7.8 0.01 NA 0.3 0

7B 9/1/2004 7.7 0.03 NA 0.31 3

7C 9/1/2004 7.7 0.04 NA 0.35 4

8 9/1/2004 8.4 <.01 0.02 0.32 6

9 9/1/2004

10 9/1/2004

11 9/1/2004

11A 9/1/2004 18 9.5 8.4 8.4 0.02 0.02 0.31 NA

11B 9/1/2004 18 8.2 8.4 0.01 0.02 0.26 NA

11C 9/1/2004 17 4.2 8.2 <.01 0.03 0.28 NA

11D 9/1/2004 14.5 0 7.3 0.11 0.23 0.12 NA

12 9/1/2004

13 9/1/2004

1 8/17/2005 7.8 0.02 <0.01 0.2 127 15 0

1A 8/17/2005 8.1 0.01 <0.01 0.1 126 17 9

2 8/17/2005 8.2 0.09 <0.01 0.15 120 15 12

3 8/17/2005 8.1 0.02 <0.01 0.08 122 15 0

4 8/17/2005 8.1 0.04 <0.01 0.13 120 16 4

5 8/17/2005

6 8/17/2005 8.1 0.02 <0.01 0.09 124 15 15

7 8/17/2005 8.3 0.02 <0.01 0.12 127 16 9

7A 8/17/2005 7.5 0.03 0.01 0.14 151 14 3

7B 8/17/2005 7.3 0.07 0.14 0.25 179 14 2

7C 8/17/2005 7.4 0.12 <.01 0.21 169 14 0

8 8/17/2005 8.3 0.02 <.01 0.07 124 17 4

9 8/17/2005

10 8/17/2005

11 8/17/2005

11A 8/17/2005 25 7 8.9 8.2 0.02 <.01 0.05 123 15 0

11B 8/17/2005 19 6.4 8.2 0.01 <.01 0.08 123 15 NR

11C 8/17/2005 18 0.8 8 <.01 0.01 0.08 126 15 NR

11D 8/17/2005 14 0 7.5 0.04 0.44 0.1 143 15 NR

12 8/17/2005

13 8/17/2005

1 8/16/2006 7.7 0.02 0.03 0.1 114 18 0

1A 8/16/2006 7.4 0.05 0.02 0.12 124 20 26

2 8/16/2006 8.2 <.01 0.01 0.11 111 18 4

3 8/16/2006 8 0.02 0.01 0.11 114 18 0

4 8/16/2006 8.1 0.01 0.01 0.11 116 18 14

5 8/16/2006

6 8/16/2006 8.1 0.04 0.01 0.12 113 19 10

7 8/16/2006 8 0.01 0.01 0.11 114 18 7

7A 8/16/2006 7.8 0.02 0.03 0.12 138 18 2

7B 8/16/2006 7.6 0.05 0.07 0.13 170 17 2

7C 8/16/2006 7.6 0.06 0.04 0.12 166 18 0

8 8/16/2006 7.9 0.02 <.01 0.28 124 19 22

9 8/16/2006

10 8/16/2006

11 8/16/2006

11A 8/16/2006 24.5 9 8.8 8.1 0.01 <.01 0.12 116 18 0

11B 8/16/2006 8.1 0.03 0.01 0.12 116 18 NR

11C 8/16/2006 8 0.02 0.06 0.11 118 17 NR

11D 8/16/2006 7.4 0.05 0.52 0.11 137 18 NR

12 8/16/2006

13 8/16/2006

1 7/12/2008 8.2 <.01 0.01 0.41 106 18 1

1A 7/12/2008 8.2 0.01 <.01 0.38 105 18 3

2 7/12/2008 8.2 <.01 <.01 0.27 105 18 0

3 7/12/2008 8.2 <.01 <.01 0.39 104 18 1

4 7/12/2008 8.3 0.01 <.01 0.21 103 16 0

5 7/12/2008

6 7/12/2008 8.2 <.01 <.01 0.36 106 17 2

7 7/12/2008 8.3 <.01 <.01 0.32 107 18 6

7A 7/12/2008 8.1 0.05 <.01 0.34 108 17 1

7B 7/12/2008 7.9 0.07 <.01 1.18 152 16 0

7C 7/12/2008 8 0.09 <.01 1.23 167 15 0

8 7/12/2008 8.2 <.01 <.01 0.28 108 17 0

9 7/12/2008

10 7/12/2008

11 7/12/2008

11A 7/12/2008 24 7 8.4 8.3 0.01 <.01 0.22 107 16 1

11B 7/12/2008 8.3 <.01 0.01 0.16 105 17 0

11C 7/12/2008 8.1 <.01 0.01 0.23 107 17 NR

11D 7/12/2008 7.3 0.02 1.77 0.64 156 17 NR

12 7/12/2008

13 7/12/2008

1 9/1/2009 8.2 <.01 0.03 0.95 112 13 0

1A 9/1/2009 8.2 0.09 0.01 0.81 110 13 0

1B 9/1/2009 nr nr nr nr nr nr 0

1C 9/1/2009 nr nr nr nr nr nr 0

2 9/1/2009 8 0.05 0.35 0.94 110 12 2

4 9/1/2009 8.3 <.01 0.02 1.06 110 13 0

5 9/1/2009

6 9/1/2009

7B 9/1/2009 8.1 0.02 0.07 1.47 120 13 0

8 9/1/2009 8.2 0.03 0.04 1.59 116 14 0

9 9/1/2009

10 9/1/2009

11 9/1/2009 18 12.5 9.4 8.2 0.08 0.06 1.08 111 12 0

12 9/1/2009 8.5 0.05 0.04 0.9 108 14 0

13 9/1/2009 8.2 0.13 0.05 1.47 112 14 0

15 9/1/2009 8.2 0.02 0.05 0.98 110 17 1

1 8/23/2011 8.1 0.07 <.01 1.28 119 16

1A 8/23/2011 8.4 0.03 <.01 1.04 112 15

2 8/23/2011 8.3 0.03 <.01 0.8 113 14

4 8/23/2011 8.6 0.02 <.01 1.01 110 14

7B 8/23/2011 7.7 0.02 <.01 1.17 164 11

8 8/23/2011 8.3 0.03 0.22 1.71 138 18

11 8/23/2011 23.5 9.8 9 8.6 0.03 0.01 0.85 118 14

11A (10') 8/23/2011 8.6 0.03 0.08 0.79 118 14

11B (20') 8/23/2011 7.9 0.03 0.01 0.8 106 14

11C (30') 8/23/2011 7.9 0.04 0.29 0.99 166 14

12 8/23/2011 8.6 0.02 0.02 0.64 111 13

13 8/23/2011 8.7 0.03 0.03 0.7 118 14

14 8/23/2011 8.7 0.03 <.01 0.9 131 15

15 8/23/2011 8.7 0.03 0.01 0.78 108 14

1 8/20/2013 23.5 7.9 320 8.73 0.011 <0.025 <0.1 120 17 <1

4 8/20/2013 23 9.2 320 8.93 0.016 <0.025 <0.1 120 17 1

7B 8/20/2013 21.5 8 380 7.98 0.039 <0.025 <0.1 160 15 14

8 8/20/2013 23 9.1 330 8.87 0.017 <0.025 <0.1 120 17 2

11 surface 8/20/2013 24 8 9.1 320 8.86 0.017 <0.025 <0.1 120 17 8

11 bottom 8/20/2013 9.5 3.7 380 8.26 0.096 1.6 <0.1

1 7/30/2014 17.9 9.53 360 8.25 0.026 < 0.05 < 0.1 140 19 < 1.0

4 7/30/2014 17.8 9.2 350 8.3 0.024 < 0.05 < 0.1 120 19 < 1.0

7B 7/30/2014 17 9.32 420 8 0.036 < 0.05 < 0.1 140 16 < 1.0

8 7/30/2014 17.1 8.43 350 8.27 0.028 < 0.05 < 0.1 140 19 < 1.0

11 surface 7/30/2014 17.2 9.5 9.22 350 8.49 0.026 < 0.05 < 0.1 140 19 < 1.0

11 bottom 7/30/2014 16.5 5.66 370 7.92 0.042 0.091 < 0.1

1 8/17/2015 27.3 7.61 340 8.04 0.015 0.28 < 0.1 140 18 34

4 8/17/2015 27.7 8.08 340 8.21 0.015 0.38 < 0.1 140 17 < 1.0

7B 8/17/2015 26.3 5.86 400 7.59 0.041 0.88 < 0.1 170 15 24

8 8/17/2015 26.3 8.62 360 8.33 0.017 0.069 < 0.1 140 18 2

11 surface 8/17/2015 27.1 8.5 8.66 350 8.24 0.015 0.21 < 0.1 140 17 2

11 bottom 8/17/2015 13.7 0.04 410 8 <0.01 0.8 < 0.1