pottstown landfill gw... · applied testing & geosciences, llc 2 december 2014 hydrogeologic...

POTTSTOWN LANDFILL GROUNDWATER EXTRACTION SYSTEM

Delaware River Basin Commission Bi-annual Report for

September 2012– August 2014 DRBC Permit No. D-91-47 PA

Prepared for:

Waste Management Disposal Services of Pennsylvania, Inc. Pottstown Landfill

1425 Sell Road Pottstown, Pennsylvania. 19464

Prepared by:

Applied Testing & Geosciences LLC 401 E. Fourth Street

Building 12B Bridgeport, PA 19405

December 2014

10057 Pottstown Landfill Delaware River Basin Commission - Biannual Report for 2012 through 2014

Applied Testing & Geosciences, LLC i December 2014

TABLE OF CONTENTS

Section Page

1. 0 INTRODUCTION ............................................................................................................................................... 1

1.1 BACKGROUND .................................................................................................................................................. 1

1.2 PURPOSE AND SCOPE ........................................................................................................................................ 3

2.0 SYSTEM PERFORMANCE AND MONITORING ......................................................................................... 4

2.1 SYSTEM OPERATION AND FLOW RATES ........................................................................................................... 4

2.2 GROUNDWATER ELEVATION MONITORING ...................................................................................................... 4

3.0 SYSTEM EFFECTIVENESS .............................................................................................................................. 5

3.1 GROUNDWATER CAPTURE AREA ...................................................................................................................... 5

4.0 SUMMARY ........................................................................................................................................................... 6

Tables

Table 1 Extraction Well Flow Meter Data

Table 2 Extraction Well Quantity Pumped

Table 3 Extraction Well Pumping Rate

Table 4 Groundwater Elevations September 2012 – August 2014

Figures

Figure 1 Site Location Map

Figure 2 Groundwater Contours – September 2012

Figure 3 Groundwater Contours – February 2013

Figure 4 Groundwater Contours – November 2013

Figure 5 Groundwater Contours – April 2014


Applied Testing & Geosciences, LLC 1 December 2014

1. 0 INTRODUCTION

1.1 Background

Pottstown Landfill is located approximately two miles northwest of Pottstown, Pennsylvania, on the

Berks-Montgomery County line (see Figure 1). Landfill activities are believed to have begun in the

1930s, with the site primarily accepting municipal solid waste. Forty acres in the southwestern area of the

landfill adjacent to Sell Road represent the oldest portion of the landfill.

Evidence of leachate constituent migration in the groundwater from this area was first discovered in 1979.

As a result, the Facility Closure Plan (FCP) required the construction of a groundwater extraction system

for controlling, collecting, and treating leachate constituents believed to be migrating from the area.

In 1990, Golder Associates, Inc. was retained to complete a groundwater flow modeling study of the site

aimed at identifying the locations and design parameters for a groundwater extraction system capable of

controlling the groundwater area containing leachate constituents. The system was designed to capture

shallow groundwater from a 1,000-foot wide by 100-foot deep section of the aquifer believed to contain

leachate constituents related to the old unlined sections of the landfill. The entire system was expected to

have an average yield between three and eight gallons per minute (gpm).

In February 1991, R.E. Wright Associates, Inc. was engaged to design and install the shallow

groundwater collection system, and piping system to convey the recovered groundwater to the on-site

treatment facility. Construction of the extraction system required the installation, and testing of six

groundwater extraction wells and an evaluation of local aquifer hydraulics (see Figure 2 for well

locations). The inherently low-yielding Triassic siltstone was hydro-fractured (at the wells) to enhance

and develop the natural fracture systems in the bedrock. This procedure resulted in the necessary control

zone being developed by extraction of groundwater from three of the six wells (RW02, RW05, and

RW06)

These wells were completed and connected to the piping system for the on-site pre-treatment plant. The

groundwater level in each of these wells was controlled with high/low, on/off switches located as required

to maintain the necessary drawdown at each well. Groundwater recovered from each well was routed via

separate pipe to a system control building, where the flows were metered and combined for discharge to

the pre-treatment facility. The design and construction of this system is described in detail in the

following reports:

Pottstown Landfill Groundwater Extraction System; and,



Hydrogeologic Testing, Design, and Construction, dated November 1991, R.E. Wright

Associates, Inc.

The system was operated, as installed, up to 1996. Ongoing review of the data collected during operation

of the system in 1996 indicated that partial bypass of the system may have been occurring in the central

section of the extraction system. Consequently, as proposed in the 1996 Annual Assessment Report,

pumps were installed in the three inactive wells RW01, RW03, and RW04 in March 1997 and the wells

brought on line. An Interim Assessment Report was completed in July 1997 and described the effect of

pumping from these wells and recommended that the system be hydrofractured again and an additional

well be installed at either end of the system (RW07 and RW08) and hydrofractured with the intent of

providing greater security of capture. A report regarding the hydrofracturing, system augmentation and

clean-out was submitted to the Pennsylvania Department of Environmental Protection (PADEP) in

December 1997. During system operation in 1998, the requirement to gain additional control of

groundwater in the vicinity of monitoring well PDE03 became apparent. Extraction well RW05 was

deepened and cleaned out on October 26, 1998, with the pump set lower in the borehole and the control

switches lowered to provide for greater drawdown.

In July 2005 a pump was installed in well RW07 and connected to the main discharge manifold to

increase the efficiency of the groundwater control area. Well RW08 does not contain a pump.

The groundwater level in each of these wells is controlled with high/low, on/off switches, positioned, as

required, to maintain the necessary drawdown at each well or via Subgard automatic level controls. The

back-pressure on each pump is adjusted, by means of a valve on each delivery line in the control building,

to balance the pumping rate with the inflow rate of groundwater water to each well at the required

drawdown. This process helps to reduce the on-off cycling of the pump motors.

Following a year’s operation of wells RW01 and RW07, to determine relability, Subgards were added to

the remaing operating wells in July 2006.

The groundwater control extraction system is operated as required by PADEP and in accordance with

DRBC Permit No. D-91-47 PA.



1.2 Purpose and Scope

As required by DRBC Permit D-91-47 PA-3, issued on May 14, 2007, this bi-annual reports documents

the Pottstown Landfill groundwater extraction system operation and effectiveness for the period

September 2012 though August 2014. The Permit also requires submission of stream flow data for the

Manatawny Creek stream flow monitoring point No. 01471980. Monitoring of this station by USGS was

terminated on September 30, 2007. No other suitable monitoring points are available at this time.



2.0 SYSTEM PERFORMANCE AND MONITORING

2.1 System Operation and Flow Rates

The groundwater extraction wells were operated continuously during the period September 2012 through

August 2014 with only occasional down-time for routine maintenance. Maintenance issues include pump

replacement, pump motor replacement, water level sensor replacement and cleaning of the Subgards, flow

meters and strainer units on the discharge manifold.

The groundwater extraction system flow was monitored throughout the period. Pottstown Landfill

personnel recorded flow-rates and totalizer readings daily (Monday through Friday) for the operating

groundwater extraction wells. Monthly flow meter readings, taken at the same time as the monthly

rounds of groundwater level measurements, are provided on Table 1. Table 2 presents the flow per well

per month and the totalized flow for each month. The minimum 30 day total flow rate was 179,850

gallons and the maximum 30 day total flow rate per month was 346,920 gallons. The maximum value is

well within the permit allowance of 600,000 gallons/30 days.

Annual extraction quantities for September 2012 through August 2013 were 2,966,700 gallons and for the

September 2013 through August 2014 time period were 3,470,897 gallons. Both these annual quantities

are well within the Permit allowance of 7.2 million gallons per year. Monthly flow rates for each well are

provided on Table 3 which also shows the total flow rate per month for the reporting period and the 30

day flow rates for the reporting period.

2.2 Groundwater Elevation Monitoring

Groundwater elevation data was obtained each month from 17 monitoring wells in the vicinity of the

groundwater extraction wells and the 8 extraction wells (one with no pump – RW08) to evaluate the

effectiveness of the extraction system. This data is summarized in Table 4.



3.0 SYSTEM EFFECTIVENESS

3.1 Groundwater Capture Area

Figures 2 through 5 present the interpreted groundwater contours for the unconfined water table surface

and the resulting capture area maintained by the extraction system during September 2012, February,

2011, November 2011 and April 2012 which represent periods of high and low groundwater elevations in

the reporting period.. The interpreted groundwater contours clearly indicate that changes in the

groundwater levels due to system operation were restricted to an area within the Facility property.

The re-issued Permit requires the flow data of Manatawny Creek, which is located down stream from the

Pottstown Landfill, to be reported. The Manatawny Creek flow measuring station No. 01471980 was

operated by USGS and was located at Lat 40°16′22″, Long 75°40′49″ (referenced to North American

Datum of 1927), Berks County, PA). Monitoring of this station by USGS was terminated on September

30, 2007. No other suitable monitoring points are available at this time.



4.0 SUMMARY

Based on monitoring data collected during the period of September 2012 though August 2014, the

groundwater extraction system at Pottstown Landfill has functioned as intended. The quantity of water

extracted by the system was well within the DRBC allowance.

As presented in the previous Biannual Report, the Permit requirement to report stream gauging results for

Station No. 01471980 on Manatawny Creek cannot be met as this station is no longer monitored. No

other gauging station is available on Manatawny Creek downstream of the Pottstown Facility, prior to the

confluence of Manatawny Creek with The Schuylkill River. Consequently, it is presumed that the DRBC

concurs with the request to waive this Permit condition.

We trust this report is satisfactory for your requirements. If you have any questions please call 610-313-

9200.

Yours truly,

For Applied Testing & Geosciences LLC.

Richard C. King P.G. 02153-G

Principal

Date Time RW-1 RW-2 RW-3 RW-4 RW-5 RW-6 RW-7(Hours) Gallons Gallons Gallons Gallons Gallons Gallons Gallons

9/1/12 13:00 3083950 2647760 3877941 3420780 3138750 2414150 282757010/1/12 13:00 3099380 2695410 3877940 3421570 3202850 2443940 2885250

11/1/2012 13:48 3134220 2724470 3877940 3448370 3236030 2502120 294614012/1/2012 13:59 3181880 2755280 3877940 3487490 3241840 2570680 3006620

1/1/2013 14:30 3212090 2792690 3891880 3545720 3241840 2648340 30572002/1/2013 13:30 3241290 2838530 3920490 3587870 3242040 2727300 31088703/1/2013 13:30 3270500 2889340 3935930 3617275 3308100 2798250 31422804/1/2013 14:00 3295020 2936790 3940900 3619420 3442050 2850690 32176405/1/2013 13:00 3315120 2961310 3940900 3627220 3588860 2886490 32915206/1/2013 13:00 3339650 2967320 3940900 3638720 3697090 2931470 33636907/1/2013 11:00 3363500 2995840 3940980 3649900 3795480 2966550 34315008/1/2013 11:00 3388140 3034640 3945620 3649900 3896820 2986250 35087609/1/2013 11:00 3434060 3044350 3945620 3665350 3986000 3024630 3566390

10/1/2013 7:00 3447400 3076250 3945620 3688520 4046900 3094320 362028011/1/2013 7:00 3472370 3105760 3945620 3709220 4102630 3144350 365722012/1/2013 7:00 3496200 3124590 3945620 3757940 4106940 3191550 3694180

1/1/2014 7:00 3517050 3160820 7870 3832020 4148830 3258940 37357602/1/2014 7:00 3564110 3207080 17070 3894130 4201330 3339730 37787003/1/2014 8:00 3589710 3276770 23130 3913610 4222200 3406350 38393704/1/2014 8:00 3640570 3324590 33680 3985140 4273480 3437720 38949405/1/2014 8:00 3678650 3352000 133230 4016050 4292050 3514060 39510006/1/2014 8:00 3714210 3395110 133910 4049940 4365090 3559160 39926307/1/2014 8:00 3740380 3428120 219490 4088170 4381100 3629600 40326408/1/2014 8:00 3773300 3445220 258080 4097120 4450470 3664090 40726809/1/2014 8:00 3786740 3447200 301620 4106490 4517290 3706800 4119840

TABLE 1POTTSTOWN LANDFILL

GROUNDWATER EXTRACTION SYSTEM DRBC BI-ANNUAL REPORT SEPTEMBER 2012 - AUGUST 2014

EXTRACTION WELL FLOW METER READINGS

Time RW1 RW2 RW3 RW4 RW5 RW6 RW7

(Hours) Gallons Gallons Gallons Gallons Gallons Gallons Gallons

9/1/2012 13:00 14,890 43,765 0 152 110,999 8,370 60,675 23885110/1/2012 13:00 15,430 47,650 0 790 64,100 29,790 57,680 215439 30 215,43911/1/2012 13:48 34,840 29,060 0 26,800 33,180 58,180 60,890 242950 31 235,11312/1/2012 13:59 47,660 30,810 0 39,120 5,810 68,560 60,480 252440 30 252,4401/1/2013 14:30 30,210 37,410 13,940 58,230 0 77,660 50,580 268030 31 259,3842/1/2013 13:30 29,200 45,840 28,610 42,150 200 78,960 51,670 276630 31 267,7063/1/2013 13:30 29,210 50,810 15,440 29,405 66,060 70,950 33,410 295285 28 316,3774/1/2013 14:00 24,520 47,450 4,970 2,145 133,950 52,440 75,360 340835 31 329,8405/1/2013 13:00 20,100 24,520 0 7,800 146,810 35,800 73,880 308910 30 308,9106/1/2013 13:00 24,530 6,010 0 11,500 108,230 44,980 72,170 267420 31 258,7947/1/2013 11:00 23,850 28,520 80 11,180 98,390 35,080 67,810 264910 30 264,9108/1/2013 11:00 24,640 38,800 4,640 0 101,340 19,700 77,260 266380 31 257,7879/1/2013 11:00 45,920 9,710 0 15,450 89,180 38,380 57,630 256270 31 248,00310/1/2013 7:00 13,340 31,900 0 23,170 60,900 69,690 53,890 252890 30 252,89011/1/2013 7:00 24,970 29,510 0 20,700 55,730 50,030 36,940 217880 31 210,85212/1/2013 7:00 23,830 18,830 0 48,720 4,310 47,200 36,960 179850 30 179,8501/1/2014 7:00 20,850 36,230 7,870 74,080 41,890 67,390 41,580 289890 31 280,5392/1/2014 7:00 47,060 46,260 9,200 62,110 52,500 80,790 42,940 340860 31 329,8653/1/2014 8:00 25,600 69,690 6,060 19,480 20,870 66,620 60,670 268990 28 288,2044/1/2014 8:00 50,860 47,820 10,550 71,530 51,280 31,370 55,570 318980 31 308,6905/1/2014 8:00 38,080 27,410 99,550 30,910 18,570 76,340 56,060 346920 30 346,9206/1/2014 8:00 35,560 43,110 680 33,890 73,040 45,100 41,630 273010 31 264,2037/1/2014 8:00 26,170 33,010 85,580 38,230 16,010 70,440 40,010 309450 30 309,4508/1/2014 8:00 32,920 17,100 38,590 8,950 69,370 34,490 40,040 241460 31 233,6719/1/2014 8:00 13,440 1,980 43,540 9,370 66,820 42,710 47,160 225020 31 217,761

Date Total Gallons

Number of Days

Pumping Rate per 30 days

Gallons



EXTRACTION WELL QUANTITY PUMPED

0

50,000

100,000

150,000

200,000

250,000

300,000

350,000

400,000

Gal

lons

Pum

ped

Per M

onth

Date

30 day Pumping Rate NOvember 2012 through October 2014



EXTRACTION WELL PUMPING RATE

Time RW1 RW2 RW3 RW4 RW5 RW6 RW-7 Total(Hours) GPM GPM GPM GPM GPM GPM GPM GPM

9/1/2012 13:00 0.333 0.978 0.000 0.003 2.482 0.187 1.356 5.3410/1/2012 13:00 0.357 1.103 0.000 0.018 1.484 0.690 1.335 4.9911/1/2012 13:48 0.780 0.650 0.000 0.600 0.742 1.302 1.363 5.4412/1/2012 13:59 1.103 0.713 0.000 0.905 0.134 1.587 1.400 5.841/1/2013 14:30 0.676 0.837 0.312 1.304 0.000 1.738 1.132 6.002/1/2013 13:30 0.655 1.028 0.642 0.945 0.004 1.771 1.159 6.213/1/2013 13:30 0.724 1.260 0.383 0.729 1.638 1.760 0.829 7.324/1/2013 14:00 0.549 1.062 0.111 0.048 2.999 1.174 1.687 7.635/1/2013 13:00 0.466 0.568 0.000 0.181 3.403 0.830 1.713 7.166/1/2013 13:00 0.550 0.135 0.000 0.258 2.425 1.008 1.617 5.997/1/2013 11:00 0.554 0.662 0.002 0.260 2.284 0.814 1.574 6.158/1/2013 11:00 0.552 0.869 0.104 0.000 2.270 0.441 1.731 5.979/1/2013 11:00 1.029 0.218 0.000 0.346 1.998 0.860 1.291 5.7410/1/2013 7:00 0.311 0.743 0.000 0.539 1.418 1.622 1.254 5.8911/1/2013 7:00 0.559 0.661 0.000 0.464 1.248 1.121 0.828 4.8812/1/2013 7:00 0.552 0.436 0.000 1.128 0.100 1.093 0.856 4.161/1/2014 7:00 0.467 0.812 0.176 1.659 0.938 1.510 0.931 6.492/1/2014 7:00 1.054 1.036 0.206 1.391 1.176 1.810 0.962 7.643/1/2014 8:00 0.634 1.726 0.150 0.482 0.517 1.650 1.502 6.664/1/2014 8:00 1.139 1.071 0.236 1.602 1.149 0.703 1.245 7.155/1/2014 8:00 0.881 0.634 2.304 0.716 0.430 1.767 1.298 8.036/1/2014 8:00 0.797 0.966 0.015 0.759 1.636 1.010 0.933 6.127/1/2014 8:00 0.606 0.764 1.981 0.885 0.371 1.631 0.926 7.168/1/2014 8:00 0.737 0.383 0.864 0.200 1.554 0.773 0.897 5.419/1/2014 8:00 0.301 0.044 0.975 0.210 1.497 0.957 1.056 5.04

Date

9/7/2012 10/4/2012 11/5/2012 12/4/2012 1/9/2013 2/6/2013 3/6/2013 4/3/2013 5/1/2013 6/3/2013 7/11/2013 8/5/2013PDE-03 167.95 170.26 170.18 170.18 171.05 179.19 170.57 170.68 170.62 171.63 170.91 171.47PDE-04 169.88 173.26 173.13 173.21 175.15 181.99 176.51 176.29 175.78 176.35 175.59 175.76PDG-06R 220.02 220.81 223.91 223.51 227.17 228.99 229.9 230.29 230.07 228.31 229.31 229.69PDG-07R 178.87 182.44 194.48 195 188.92 192.22 191.01 191.71 192.71 189.54 192.54 193PDG-08R 200.55 192.32 186.7 193.35 198.57 198.67 197.56 198.08 198.78 195.34 198.34 198.78PDG-09R 162.15 167.96 166.56 166.98 167.81 175.89 169.87 169.32 169 170.66 168.22 168.4PDG-10R 183.32 183.07 183.92 184.21 185.74 187.02 188.09 188.2 188.08 187.43 187 186.82PDG-11R 168.78 169.36 169.32 171.38 172.38 175.48 173.89 174.1 174.28 173.02 173.37 173.23PDG-12S 170.85 171.16 172.03 172.32 172.64 173.26 173.56 173.33 173.1 172.76 172.73 172.69PDG-13R 178.92 179.53 180.58 181.24 183 185.8 185.8 184.9 185.2 182.93 183.44 183.81PDG-14R 174.53 175.29 178.41 181.44 181.39 183.71 183.58 183.58 183.68 177.79 180.23 181.28PDG-17 166 166.27 167.15 167.62 168.24 169.65 169.48 169.66 169.78 169.09 169.3 169PDG-18 165.93 166.08 170.98 167.71 167.84 169.49 168.77 168.37 168.19 168.1 168.32 167.71PDG-25 164.6 164.85 165.46 165.59 166.99 168.39 168.38 168.54 168.64 167.68 168.14 167.51PDG-26 167 166.96 167.25 166.7 167.49 168.29 168.43 168.35 168.43 168.22 168.64 168.44PGD-05R 185.24 185.31 186.4 187.79 189.8 191.35 191.99 192.29 192.32 191.29 191.43 191.27RW-1 169.07 173.95 168.34 169.1 168.14 169.48 170 170.35 175.63 170.79 172.43 ***159.24RW-2 163.89 167.6 165.02 166.53 163.64 171.24 166.25 166.21 165.69 169.6 164.29 ***165.35RW-3 170.5 169.45 166.75 166.58 165.51 173.94 178.43 168.59 167.92 169.2 165.6 ***166.59RW-4 162.28 169.88 168.63 **165.96 168.66 175.74 170.6 169.26 172.57 175.43 174.87 ***167.07RW-5 163.24 169.5 169.38 167.25 169.19 181.51 167.82 166.13 161.77 169.69 162.75 ***165.23RW-6 163.77 167.28 167.8 164.34 164.46 178.4 173.4 169.33 168.72 168.46 174.28 ***162.7RW-7 158.78 162.24 161.51 160.36 158.4 183.81 157.01 158.51 157.01 157.87 157.88 ***157.77RW-8 179.07 179.07 185.89 185.89 188.64 191.93 190.52 190.7 191.86 189.08 192.28 ***191.54

**12/14/2012 *** 8/26/20

9/4/2013 10/3/2013 11/6/2013 12/4/2013 1/8/2014 2/11/2014 3/6/2014 4/7/2014 5/13/2014 6/3/2014 7/7/2014 8/5/2014PDE-03 171.61 169.95 169.31 170.03 175.58 175.82 171.58 172.29 171.39 171.08 171.01 169.75PDE-04 174 16 172 56 173 14 172 59 178 61 179 03 175 67 175 57 175 7 173 46 174 6 172 25


DRBC BI-ANNUAL REPORT SEPTEMBER 2012 - AUGUST 2014GROUNDWATER ELEVATIONS

Date

Date

WELL

WELL

PDE-04 174.16 172.56 173.14 172.59 178.61 179.03 175.67 175.57 175.7 173.46 174.6 172.25PDG-06R 228.77 185.45 222.27 221.96 226.56 228.17 229.08 229.87 229.82 228.06 226.66 224.49PDG-07R 190.49 203.06 182.31 182.1 190.2 189.65 192.781 192.04 193.09 190.55 188.45 181.04PDG-08R 196.17 181.11 191.1 191.07 197.47 196.28 196.88 198.64 199.83 196.34 194.84 191.95PDG-09R 167.05 175.51 167.01 166.49 172.07 172.92 166.7 166.76 167.85 165.7 167.6 164.72PDG-10R 186.33 165.78 183.74 183.93 185.64 186.9 187.93 189.08 188.56 187.7 186.57 185.49PDG-11R 172.1 164.84 170.18 170.79 173.93 174.23 174.23 174.99 175.53 174.17 172.13 170.58PDG-12S 172.12 171.89 171.4 172.31 174.34 173.57 173.49 174.3 173.06 172.5 172.05 171.49PDG-13R 182.24 179.59 179.89 180.09 183.67 184.07 184.27 184.9 185.67 183.43 181.68 179.75PDG-14R 178.4 175.41 175.64 177.91 183.22 183.13 184.18 185.44 185.36 182.28 175.87 175.48PDG-17 168.3 167.07 166.71 166.61 169.42 169.71 169.78 170.35 170.3 169.55 168.44 167.26PDG-18 167.07 167.03 166.47 167.71 171.43 170.71 169.91 169.97 168.45 167.67 167.23 166.74PDG-25 167.05 165.52 165.32 165.55 168.09 168.56 168.64 169.34 169.28 168.48 167.3 165.99PDG-26 166.21 166.65 166.35 165.07 168.53 168.66 168.09 169.34 168.74 168.07 167.93 167.2PGD-05R 189.96 231.71 186.3 186.49 189.75 190.9 192.1 193 192.42 191.76 189.7 187.44RW-1 162.53 168.62 166.65 167.67 !!!164.7 172.35 159.33 159.2 166.64 166.95 ###170.01 170.01RW-2 165.01 163.86 165.2 164.62 164.88 165.4 163.22 163.29 165.3 161.88 165.39 161.39RW-3 168.79 169.08 164.8 164.82 166.99 168.45 168.8 170.3 164.82 166.29 164.3 163.95RW-4 168.96 170.42 164.83 164.94 167.57 174.38 171.08 164.98 172.97 168.88 166.98 164.85RW-5 162.61 165.89 163.29 163.13 !!!172.27 177.09 164.99 166.48 168.99 163.35 163.91 162.8RW-6 160.78 161.56 163.74 163.13 163.64 165.94 170.83 163.91 165.29 163.81 ###164.92 164.92RW-7 157.55 157.74 157.74 158.28 157.78 167.36 155.08 157.79 167.17 166.79 164.25 161.98RW-8 190.29 179.45 182.26 181.89 189.97 189.43 192.31 191.49 192.52 190.19 188.58 180.92

!!!1/16/2014 ###7/14/2014Elevation after Maintenance Low Groundwater High Groundwater

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