ZONE 7 WATER AGENCY FILTER SURVEILLANCE REPORT FOR PATTERSON PASS WTP PERFORMED & PREPARED. By: ERS INDUSTRIAL SERVICES, INC.

Transcription

1 ZONE 7 WATER AGENCY FILTER SURVEILLANCE REPORT FOR PATTERSON PASS WTP PERFORMED & PREPARED By: ERS INDUSTRIAL SERVICES, INC. ERS INDUSTRIAL SERVICES, INC Warm Springs Ct phone fax

2 Zone 7 Water Agency 100 North Canyons Parkway Livermore, CA ATTENTION: ALLEN DAHLQUIST REFERENCE: FIELD SURVEILLANCE REPORT PATTERSON PASS WTP Mr. Dahlquist: On March 20-22, 2018 a crew from ERS Industrial Services, Inc. visited the Patterson Pass Water Treatment Plant located at 8750 Patterson Pass Rd. Livermore, CA The plant is owned and operated by the Zone 7 Water Agency. The purpose of this visit was to perform filter surveillance on three (3) 338 sq. foot, double cell, tri media, gravity filters, operated at the plant. This filter surveillance consists of a number of tests, measurements and observations which, when conducted in accordance with AWWA standards, can provide insight into conditions that exist within the filters. When performed periodically, these tests can provide additional information on long term changes in filter conditions as they develop. The following report includes the field notes that document the observations, measurements and test results as well as copies of the results of the laboratory tests performed on the samples taken from each filter.

3 Page 2 of 2 Filter Surveillance Report May 21, 2018 GENERAL NOTES: The three (3) double cell filters were observed to be uniform in their appearance and over all operational characteristics. The following items were either outside of the specifications provided, or were of particular note. 1. Media depths in all three (3) filters were measured to be below the thirty-three (33) inch specifications. 2. Gravel beds were uneven in all three (3) filters. 3. Sand tested higher than the effective size specifications in all three (3) filters. 4. Anthracite tested higher than the effective size specifications with the exception of filter 3A. 5. Coatings in Filter Two (2) are failing. If you have any questions regarding this information, how it was obtained or how to interpret it, please feel free to contact me. Sincerely, Bradford Radonich II

4 FILTER 1A ANALYSIS ERS INDUSTRIAL SERVICES, INC Warm Springs Ct phone fax

5 FILTER SURVEILLANCE Filter Evaluation for: Filter Type: Filter Number: Gravity 1A Zone 7 Contact: Inspector: Plant: Allan Dahlquist Isidro Martinez Patterson Pass WTP Phone # Date: 3/20/2018 Filter Surface: Pre Backwash Inspection Media surface has a coating of mud but appears level. Acceptable Wall Condition: Acceptable Coatings are smooth and solidly attached with minor cracks on the wall between filter 2. Also Ferric Chloride staining on walls. Mechanical System: Acceptable Surface wash is complete and working as designed. Troughs are level and in good condition. Media Measurements Freeboard Measurements: (Inches from lip to top of media) A B C Media Depth: (Inches from top of media to gravel bed) A B C Support Gravel: (Footprint in inches) A B C

6 Media Core Samples: Yes Specified (Inches) Measured (Inches) GAC/Anthracite: Sand: High Density Sand: Total Depth: Media Interface: < General Observation: Acceptable Backwash Backwash initiated smoothly. Backwash water was cloudy at end of cycle. Filter media was level and clean after cycle. Water samples every 30 seconds. Media Expansion: 5 in 17.86% Post Backwash Media Core Samples ES-UC Effective Size Uniformity Coefficient Specified Actual Specified Actual GAC/Anthracite: < Sand: < High Density Sand: Other: Sample Analysis Included Yes

7 ERS INDUSTRIAL SERVICES, INC. Filter Media Analysis Project: Zone 7 ( 3 Gravity Filters, Double Cell ) Patterson Pass 2018 Sample No: ZN-1A-A#0001 Location: Livermore, CA Material: Anthracite Date Sampled: 3/20/2018 Source: ERS Industrial Services, Inc. Sampled By: Ricky Lim Date Tested: 4/3/2018 Tested By: Francisco G. Sieve Set: A.S.T.M C134/CAL 202 Date Calibrated: 4/1/2018 No. 100 Sieve # Size (mm) % 0% Passing 100 No. 20No. 18No % 1% 16% No % No. 12No % 100% Spec: E.S = U.C = < 1.5 Weight: ZN-1A-A# E.S. = 1.13 Percent Passing (%) U.C. = 1.46/1.13 = 1.29 D 60 = 1.46 mm D 10 = 1.13 mm Particle Size (mm) Remarks: Sieve Analysis S.T.A.R.S.

8 ERS INDUSTRIAL SERVICES, INC. Filter Media Analysis Project: Zone 7 ( 3 Gravity Filters, Double Cell ) Patterson Pass 2018 Sample No: ZN-1S-A#0001 Location: Livermore, CA Material: Sand Date Sampled: 3/20/2018 Source: ERS Industrial Services, Inc Sampled By: Ricky Lim Date Tested: 4/3/2018 Tested By: Francisco G. Sieve Set: A.S.T.M C134/CAL 202 Date Calibrated: 4/1/2018 No. 100 Sieve # Size (mm) % 4% Passing No. 35 No. 30No. 25 No. 20No % 16% 55% 97% 100% Spec: E.S. = U.C. = < 1.5 Weight: ZN-1S-A# E.S. = 0.57 Percent Passing (%) U.C. = 0.72/0.57 = 1.26 D 60 = 0.72 mm D 10 = 0.57 mm Particle Size (mm) Remarks: Sieve Analysis S.T.A.R.S.

9 Patterson Pass WTP Filter: 1A Flock Retention Analysis Before Wash 33" Inches Media Depth (Specified) 2500 NTU 2000 After Wash BW AW Inches Below Media Surface (As Specified)

10 Patterson Pass WTP 1A NTU Minutes Turbidity Minutes (30 Second Intervals)

11 FILTER LAYOUT Zone 7 Patterson Pass WTP 1A A B C F M F M F M TROUGH ` A B C N Before Wash Core After Wash Core Expansion Tool Location

12 GRAVEL PROFILE Zone 7 Patterson Pass WTP 1A A B C A C B C B MEDIA DEPTH A

13 FILTER 1B ANALYSIS ERS INDUSTRIAL SERVICES, INC Warm Springs Ct phone fax

14 FILTER SURVEILLANCE Filter Evaluation for: Filter Type: Filter Number: Gravity 1B Zone 7 Contact: Inspector: Plant: Allan Dahlquist Isidro Martinez Patterson Pass WTP Phone # Date: 3/20/2018 Filter Surface: Pre Backwash Inspection Media surface has a coating of mud but appears level. Acceptable Wall Condition: Acceptable Coatings are smooth and solidly attached with minor cracks on the wall between filter 2. Also Ferric Chloride staining on walls. Mechanical System: Acceptable Surface wash is complete and working as designed. Troughs are level and in good condition. Freeboard to nozzle West side 12 inches and East side 9 inches. Media Measurements Freeboard Measurements: (Inches from lip to top of media) A B C Media Depth: (Inches from top of media to gravel bed) A B C Support Gravel: (Footprint in inches) A B C

15 Media Core Samples: Yes Specified (Inches) Measured (Inches) GAC/Anthracite: Sand: High Density Sand: Total Depth: Media Interface: < General Observation: Acceptable Backwash Backwash initiated smoothly. Backwash water was cloudy at end of cycle. Filter media was level and clean after cycle. Water samples every 30 seconds. Media Expansion: 5 in 20.00% Post Backwash Media Core Samples ES-UC Effective Size Uniformity Coefficient Specified Actual Specified Actual GAC/Anthracite: < Sand: < High Density Sand: Other: Sample Analysis Included Yes

16 ERS INDUSTRIAL SERVICES, INC. Filter Media Analysis Project: Zone 7 ( 3 Gravity Filters, Double Cell ) Patterson Pass 2018 Sample No: ZN-1A-B#0001 Location: Livermore, CA Material: Anthracite Date Sampled: 3/20/2018 Source: ERS Industrial Services, Inc Sampled By: Ricky Lim Date Tested: 4/3/2018 Tested By: Francisco G. Sieve Set: A.S.T.M C134/CAL 202 Date Calibrated: 4/1/2018 No. 100 Sieve # Size (mm) % 0% Passing 100 No. 20No. 18No % 1% 8% No % No. 12No. 10 No % 93% 100% Spec: E.S = U.C = < 1.5 Weight: ZN-1A-B# E.S. = 1.21 Percent Passing (%) U.C. = 1.59/1.21 = 1.31 D 60 = 1.59 mm D 10 = 1.21 mm Particle Size (mm) Remarks: Sieve Analysis S.T.A.R.S.

17 ERS INDUSTRIAL SERVICES, INC. Filter Media Analysis Project: Zone 7 ( 3 Gravity Filters, Double Cell ) Patterson Pass 2018 Sample No: ZN-1S-B#0001 Location: Livermore, CA Material: Sand Date Sampled: 3/20/2018 Source: ERS Industrial Services, Inc Sampled By: Ricky Lim Date Tested: 4/3/2018 Tested By: Francisco G. Sieve Set: A.S.T.M C134/CAL 202 Date Calibrated: 4/1/2018 No. 100 Sieve # Size (mm) % 4% Passing No. 35 No. 30No. 25 No. 20No % 13% 55% 87% 100% Spec: E.S. = U.C. = < 1.5 Weight: ZN-1S-B# E.S. = 0.59 Percent Passing (%) U.C. = 0.73/0.59 = 1.24 D 60 = 0.73 mm D 10 = 0.59 mm Particle Size (mm) Remarks: Sieve Analysis S.T.A.R.S.

18 Patterson Pass WTP Filter: 1B Flock Retention Analysis Before Wash 33" Inches Media Depth (Specified) 1400 NTU After Wash BW AW Inches Below Media Surface (As Specified)

19 Patterson Pass WTP 1B NTU Minutes Turbidity Minutes (30 Second Intervals)

20 FILTER LAYOUT Zone 7 Patterson Pass WTP 1B A B C F M F M F M TROUGH ` A B C N Before Wash Core After Wash Core Expansion Tool Location

21 GRAVEL PROFILE Zone 7 Patterson Pass WTP 1B A B C A C B C B MEDIA DEPTH A

22 FILTER 2A ANALYSIS ERS INDUSTRIAL SERVICES, INC Warm Springs Ct phone fax

23 FILTER SURVEILLANCE Filter Evaluation for: Filter Type: Filter Number: Gravity 2A Zone 7 Contact: Inspector: Plant: Allan Dahlquist Isidro Martinez Patterson Pass WTP Phone # Date: 3/20/2018 Filter Surface: Pre Backwash Inspection Media surface has a coating of mud but appears level. Acceptable Wall Condition: Coatings are failing with corrosion. Couple cracks on North and South walls. Acceptable Mechanical System: Acceptable Surface wash is complete and working as designed. Troughs are level and in good condition. Freeboard to nozzle on the North and South side were measured at 8 inches. Media Measurements Freeboard Measurements: (Inches from lip to top of media) A B C Media Depth: (Inches from top of media to gravel bed) A B C Support Gravel: (Footprint in inches) A B C

24 Media Core Samples: Yes Specified (Inches) Measured (Inches) GAC/Anthracite: Sand: High Density Sand: Total Depth: Media Interface: < General Observation: Acceptable Backwash Backwash initiated smoothly. Backwash water was clear at end of cycle. Filter media was level and clean after cycle. Water samples every 30 seconds. Media Expansion: 7 in 26.92% Post Backwash Media Core Samples ES-UC Effective Size Uniformity Coefficient Specified Actual Specified Actual GAC/Anthracite: < Sand: < High Density Sand: Other: Sample Analysis Included Yes

25 ERS INDUSTRIAL SERVICES, INC. Filter Media Analysis Project: Zone 7 ( 3 Gravity Filters, Double Cell ) Patterson Pass 2018 Sample No: ZN-2A-A#0001 Location: Livermore, CA Material: Anthracite Date Sampled: 3/20/2018 Source: ERS Industrial Services, Inc Sampled By: Ricky Lim Date Tested: 4/3/2018 Tested By: Francisco G. Sieve Set: A.S.T.M C134/CAL 202 Date Calibrated: 4/1/2018 No. 100 Sieve # Size (mm) %% Passing No % Spec: E.S = U.C = < 1.5 Weight:.33 No. 20No. 18No % 4% 13% No % No. 12No. 10 No % 97% 100% 80 ZN-2A-A# E.S. = 1.13 Percent Passing (%) U.C. = 1.53/1.13 = 1.35 D 60 = 1.53 mm D 10 = 1.13 mm Particle Size (mm) Remarks: Sieve Analysis S.T.A.R.S.

26 ERS INDUSTRIAL SERVICES, INC. Filter Media Analysis Project: Zone 7 ( 3 Gravity Filters, Double Cell ) Patterson Pass 2018 Sample No: ZN-2S-A#0001 Location: Livermore, CA Material: Sand Date Sampled: 3/20/2018 Source: ERS Industrial Services, Inc Sampled By: Ricky Lim Date Tested: 4/3/2018 Tested By: Francisco G. Sieve Set: A.S.T.M C134/CAL 202 Date Calibrated: 4/1/2018 No. 100 Sieve # Size (mm) % 0% Passing Spec: E.S. = U.C. = < 1.5 Weight:.42 No. 35 No. 30No. 25 No. 20No. 18No % 7% 43% 93% 98% 100% 80 ZN-2S-A# E.S. = 0.61 Percent Passing (%) U.C. = 0.75/0.61 = 1.23 D 60 = 0.75 mm D 10 = 0.61 mm Particle Size (mm) Remarks: Sieve Analysis S.T.A.R.S.

27 Patterson Pass WTP Filter: 2A Flock Retention Analysis Before Wash 33" Inches Media Depth (Specified) 2500 NTU After Wash BW AW Inches Below Media Surface (As Specified)

28 Patterson Pass WTP 2A NTU Minutes Turbidity Minutes (30 Second Intervals)

29 FILTER LAYOUT Zone 7 Patterson Pass WTP 2A A B C F M F M F M TROUGH ` A B C N Before Wash Core After Wash Core Expansion Tool Location

30 GRAVEL PROFILE Zone 7 Patterson Pass WTP 2A A B C A C B C B MEDIA DEPTH A

31 FILTER 2B ANALYSIS ERS INDUSTRIAL SERVICES, INC Warm Springs Ct phone fax

32 FILTER SURVEILLANCE Filter Evaluation for: Filter Type: Filter Number: Gravity 2B Zone 7 Contact: Inspector: Plant: Allan Dahlquist Isidro Martinez Patterson Pass WTP Phone # Date: 3/20/2018 Filter Surface: Pre Backwash Inspection Media surface has a coating of mud but appears level. Acceptable Wall Condition: Coatings are failing with corrosion. Cracks noted on North and South walls. Acceptable Mechanical System: Acceptable Surface wash is complete and working as designed. Troughs are level and in good condition. Freeboard to nozzle North side 15 inches and South side 11 inches. Media Measurements Freeboard Measurements: (Inches from lip to top of media) A B C Media Depth: (Inches from top of media to gravel bed) A B C Support Gravel: (Footprint in inches) A B C

33 Media Core Samples: Yes Specified (Inches) Measured (Inches) GAC/Anthracite: Sand: High Density Sand: Total Depth: Media Interface: < General Observation: Acceptable Backwash Backwash initiated smoothly. Backwash water was clear at end of cycle. Filter media was level and clean after cycle. Water samples every 30 seconds. Media Expansion: 7 in 29.17% Post Backwash Media Core Samples ES-UC Effective Size Uniformity Coefficient Specified Actual Specified Actual GAC/Anthracite: < Sand: < High Density Sand: Other: Sample Analysis Included Yes

34 ERS INDUSTRIAL SERVICES, INC. Filter Media Analysis Project: Zone 7 ( 3 Gravity Filters, Double Cell ) Patterson Pass 2018 Sample No: ZN-2A-B#0001 Location: Livermore, CA Material: Anthracite Date Sampled: 3/20/2018 Source: ERS Industrial Services, Inc Sampled By: Ricky Lim Date Tested: 4/3/2018 Tested By: Francisco G. Sieve Set: A.S.T.M C134/CAL 202 Date Calibrated: 4/1/2018 No. 100 Sieve # Size (mm) %% Passing No % Spec: E.S = U.C = < 1.5 Weight:.29 No. 20No. 18No % 4% 14% No % No. 12No. 10 No % 97% 100% 80 ZN-2A-B# E.S. = 1.13 Percent Passing (%) U.C. = 1.50/1.13 = 1.33 D 60 = 1.50 mm D 10 = 1.13 mm Particle Size (mm) Remarks: Sieve Analysis S.T.A.R.S.

35 ERS INDUSTRIAL SERVICES, INC. Filter Media Analysis Project: Zone 7 ( 3 Gravity Filters, Double Cell ) Patterson Pass 2018 Sample No: ZN-2S-B#0001 Location: Livermore, CA Material: Sand Date Sampled: 3/20/2018 Source: ERS Industrial Services, Inc Sampled By: Ricky Lim Date Tested: 4/3/2018 Tested By: Francisco G. Sieve Set: A.S.T.M C134/CAL 202 Date Calibrated: 4/1/2018 No. 100 Sieve # Size (mm) % 13% Passing No % No % No % Spec: E.S. = U.C. = < 1.5 Weight:.30 No % 80 ZN-2S-B# E.S. = 0.60 Percent Passing (%) U.C. = 0.74/0.60 = 1.23 D 60 = 0.74 mm D 10 = 0.60 mm Particle Size (mm) Remarks: Sieve Analysis S.T.A.R.S.

36 Patterson Pass WTP Filter: 2B Flock Retention Analysis Before Wash 33" Inches Media Depth (Specified) 1200 NTU After Wash BW AW Inches Below Media Surface (As Specified)

37 Patterson Pass WTP 2B NTU Minutes Turbidity Minutes (30 Second Intervals)

38 FILTER LAYOUT Zone 7 Patterson Pass WTP 2B A B C F M F M F M TROUGH ` A B C N Before Wash Core After Wash Core Expansion Tool Location

39 GRAVEL PROFILE Zone 7 Patterson Pass WTP 2B A B C A C B C B MEDIA DEPTH A

40 FILTER 3A ANALYSIS ERS INDUSTRIAL SERVICES, INC Warm Springs Ct phone fax

41 FILTER SURVEILLANCE Filter Evaluation for: Filter Type: Filter Number: Gravity 3A Zone 7 Contact: Inspector: Plant: Allan Dahlquist Isidro Martinez Patterson Pass WTP Phone # Date: 3/20/2018 Filter Surface: Pre Backwash Inspection Media surface has a coating of mud but appears level. Acceptable Wall Condition: Coatings are stained but appear smooth and solid. Acceptable Mechanical System: Acceptable Surface wash is complete and working as designed. Piping had minor rust. Troughs are level and in good condition. Freeboard to nozzle East side 8 inches and West side 12 inches. Media Measurements Freeboard Measurements: (Inches from lip to top of media) A B C Media Depth: (Inches from top of media to gravel bed) A B C Support Gravel: (Footprint in inches) A B C

42 Media Core Samples: Yes Specified (Inches) Measured (Inches) GAC/Anthracite: Sand: High Density Sand: Total Depth: Media Interface: < General Observation: Acceptable Backwash Backwash initiated smoothly. Backwash water was clear at end of cycle. Filter media was level and clean after cycle. Water samples every 30 seconds. Media Expansion: 5 in 22.73% Post Backwash Media Core Samples ES-UC Effective Size Uniformity Coefficient Specified Actual Specified Actual GAC/Anthracite: < Sand: < High Density Sand: Other: Sample Analysis Included Yes

43 ERS INDUSTRIAL SERVICES, INC. Filter Media Analysis Project: Zone 7 ( 3 Gravity Filters, Double Cell ) Patterson Pass 2018 Sample No: ZN-3A-A#0001 Location: Livermore, CA Material: Anthracite Date Sampled: 3/20/2018 Source: ERS Industrial Services, Inc Sampled By: Ricky Lim Date Tested: 4/3/2018 Tested By: Francisco G. Sieve Set: A.S.T.M C134/CAL 202 Date Calibrated: 4/1/2018 No. 100 Sieve # Size (mm) %% Passing No % Spec: E.S = U.C = < 1.5 Weight:.30 No. 20No. 18No % 8% 18% No % No. 12No. 10 No % 97% 100% 80 ZN-3A-A# E.S. = 1.04 Percent Passing (%) U.C. = 1.52/1.04 = 1.46 D 60 = 1.52 mm D 10 = 1.04 mm Particle Size (mm) Remarks: Sieve Analysis S.T.A.R.S.

44 ERS INDUSTRIAL SERVICES, INC. Filter Media Analysis Project: Zone 7 ( 3 Gravity Filters, Double Cell ) Patterson Pass 2018 Sample No: ZN-3S-A#0001 Location: Livermore, CA Material: Sand Date Sampled: 3/20/2018 Source: ERS Industrial Services, Inc Sampled By: Ricky Lim Date Tested: 4/3/2018 Tested By: Francisco G. Sieve Set: A.S.T.M C134/CAL 202 Date Calibrated: 4/1/2018 No. 100 Sieve # Size (mm) % 13% Passing No % No % No % Spec: E.S. = U.C. = < 1.5 Weight:.32 No % 80 ZN-3S-A# E.S. = 0.58 Percent Passing (%) U.C. = 0.72/0.58 = 1.24 D 60 = 0.72 mm D 10 = 0.58 mm Particle Size (mm) Remarks: Sieve Analysis S.T.A.R.S.

45 Patterson Pass WTP Filter: 3A Flock Retention Analysis Before Wash 33" Inches Media Depth (Specified) 1200 NTU After Wash BW AW Inches Below Media Surface (As Specified)

46 Patterson Pass WTP 3A NTU Minutes Turbidity Minutes (30 Second Intervals)

47 FILTER LAYOUT Zone 7 Patterson Pass WTP 3A A B C F M F M F M TROUGH ` A B C N Before Wash Core After Wash Core Expansion Tool Location

48 GRAVEL PROFILE Zone 7 Patterson Pass WTP 3A A B C A C B C B MEDIA DEPTH A

49 FILTER 3B ANALYSIS ERS INDUSTRIAL SERVICES, INC Warm Springs Ct phone fax

50 FILTER SURVEILLANCE Filter Evaluation for: Filter Type: Filter Number: Gravity 3B Zone 7 Contact: Inspector: Plant: Allan Dahlquist Isidro Martinez Patterson Pass WTP Phone # Date: 3/20/2018 Filter Surface: Pre Backwash Inspection Media surface has a coating of mud but appears level. Acceptable Wall Condition: Coatings are stained but appear smooth and solid. Acceptable Mechanical System: Acceptable Surface wash is complete and working as designed. Piping had minor rust. Troughs are level and in good condition. Freeboard to nozzle East side 10 inches and West side 12 inches. Media Measurements Freeboard Measurements: (Inches from lip to top of media) A B C Media Depth: (Inches from top of media to gravel bed) A B C Support Gravel: (Footprint in inches) A B C

51 Media Core Samples: Yes Specified (Inches) Measured (Inches) GAC/Anthracite: Sand: High Density Sand: Total Depth: Media Interface: < General Observation: Acceptable Backwash Backwash initiated smoothly. Backwash water was clear at end of cycle. Filter media was level and clean after cycle. Water samples every 30 seconds. Media Expansion: 5 in 20.83% Post Backwash Media Core Samples ES-UC Effective Size Uniformity Coefficient Specified Actual Specified Actual GAC/Anthracite: < Sand: < High Density Sand: Other: Sample Analysis Included Yes

52 ERS INDUSTRIAL SERVICES, INC. Filter Media Analysis Project: Zone 7 ( 3 Gravity Filters, Double Cell ) Patterson Pass 2018 Sample No: ZN-3A-B#0001 Location: Livermore, CA Material: Anthracite Date Sampled: 3/20/2018 Source: ERS Industrial Services, Inc Sampled By: Ricky Lim Date Tested: 4/3/2018 Tested By: Francisco G. Sieve Set: A.S.T.M C134/CAL 202 Date Calibrated: 4/1/2018 No. 100 Sieve # Size (mm) % 0% Passing 100 No. 20No. 18No % 4% 11% No % No. 12No. 10 No % 93% 100% Spec: E.S = U.C = < 1.5 Weight: ZN-3A-B# E.S. = 1.16 Percent Passing (%) U.C. = 1.59/1.16 = 1.37 D 60 = 1.59 mm D 10 = 1.16 mm Particle Size (mm) Remarks: Sieve Analysis S.T.A.R.S.

53 ERS INDUSTRIAL SERVICES, INC. Filter Media Analysis Project: Zone 7 ( 3 Gravity Filters, Double Cell ) Patterson Pass 2018 Sample No: ZN-3S-B#0001 Location: Livermore, CA Material: Sand Date Sampled: 3/20/2018 Source: ERS Industrial Services, Inc Sampled By: Ricky Lim Date Tested: 4/3/2018 Tested By: Francisco G. Sieve Set: A.S.T.M C134/CAL 202 Date Calibrated: 4/1/2018 No. 100 Sieve # Size (mm) % 0% Passing No. 40No. 35 No. 30No. 25 No. 20No. 18No % 1% 7% 33% 78% 94% 100% Spec: E.S. = U.C. = < 1.5 Weight: ZN-3S-B# E.S. = 0.62 Percent Passing (%) U.C. = 0.79/0.62 = 1.27 D 60 = 0.79 mm D 10 = 0.62 mm Particle Size (mm) Remarks: Sieve Analysis S.T.A.R.S.

54 Patterson Pass WTP Filter: 3B Flock Retention Analysis " Inches Media Depth (Specified) 2500 Before Wash 2000 NTU 1500 After Wash BW AW Inches Below Media Surface (As Specified)

55 Patterson Pass WTP 3B NTU Minutes Turbidity Minutes (30 Second Intervals)

56 FILTER LAYOUT Zone 7 Patterson Pass WTP 3B A B C F M F M F M TROUGH ` A B C N Before Wash Core After Wash Core Expansion Tool Location

57 GRAVEL PROFILE Zone 7 Patterson Pass WTP 3B A B C A C B C B MEDIA DEPTH A