2022-04-28; Water Quality at Hope Elementary School Update (District 2); Gomez, Paz

To the members of the:

CIT'( COUNCIL
Date ~/g }UC.A \/ CC V - -
CM --1L ACM ..JL DCM (3) ~
CMWD Board Memorandum
April 28, 2022
To: Carlsbad Municipal Wat · rict Board of Directors
From: Paz Gomez, Deputy City Man g ublic Works
Vicki Quiram, General Man g
Via: Scott Chadwick, Executive
Re: Water Quality at Hope Ele ool Update (District 2)
Ccarlsbad
Municipal Water District
Memo ID #2022053
This memorandum provides follow-up information to the previous memoranda submitted to the Carlsbad Municipal Water District (CMWD) Board of Directors dated March 3, 2022, and March 24, 2022. These memoranda relate to the Feb. 24, 2022, response to Hope Elementary School after a Carlsbad Unified School District (CUSD) contractor, Erickson-Hall Construction Company (Erickson-Hall), reported a water quality issue at Hope Elementary School.

Background
On Thursday, Feb. 24, 2022, CMWD staff received a call from the Project Manager for Erickson Hall requesting assistance with a wate r quality issue at Hope Elementary School. The Erickson Hall Project Manager indicated that recent samples taken at Hope Elementary School showed higher levels of copper than would normally be found in potable water . CMWD staff immediately responded to Hope Elementary School and began investigating the situation .

On March 16, 2022, CMWD staff completed the investigation and submitted an Incident Report to the State Water Resources Control Board (State Water Board), which is provided as Attachment A. On April 26, 2022, the CMWD submitted an Addendum to the Incident Report to the State Water Board to update a link with the correct lab results dated Aug. 31, 2021, which is provided as Attachment C.

Discussion
On April 7, 2022, the State Water Board emailed the CMWD follow-up questions on information presented in the Incident Report . On April 22, 2022, the CMWD responded to the questions, provided as Attachment B.

Since Feb. 24, 2022, Hope Elementary School has been completely disconnected from the CMWD's recycled water supply. The CUSD does not currently have potable or recycled water available for irrigation. On March 10, 2022, the CMWD sent to the CUSD a list of actions that must be taken before reconnection to the CMWD recycled water system for irrigation can be made. To date, the CUSD has not taken any of t he actions.

Carlsbad Municipal Water District
5950 El Camino Real I Carlsbad, CA 92008 I 442-339-2722 t Board Memo - Water Quality at Hope Elementary School Update (District 2) April 28, 2022

Page 2 ends

The March 24, 2022, CMWD Board Memorandum stated that CMWD staff would work with the CUSD and the San Diego County Department of Environmental Health and Quality (DEHQ) to schedule cross-connection testing of the other Carlsbad schools that have recycled water and projects under construction. As a matter of practice, DEHQ staff accompanies the CMWD on all cross-connection tests. The results of these tests will determine whether any changes have been made to those water systems and whether the potable and recycled water being served at those other schools meet all applicable regulatory standards.

On April 21, 2022, the CMWD completed cross-connection ~esting at Aviara Oaks Elementary and Middle Schools. After scheduling a cross-connection test at Sage Creek High School for April 19, 2022, CMWD staff went to the site on April 18, 2022, to ensure that the CUSD was prepared for the test and found a part of the irrigation system not working. Therefore, this test had to be rescheduled for summer 2022 to accommodate DEHQ staff's schedule.

Next Steps
A schedule of the CUSD recycled water cross-connection test dates is provided as Attachment D.

Attachments: A. CMWD Incident Report submitted on March 16, 2022 (Photos and technical maps have been redacted within this attachment due to file size. Also due to the size of Attachment A, a hardcopy is on file in the Office of the City Council, as reference)
B. CMWD response letter dated April 22, 2022
(Photos and technical map have been redacted within this attachment due to file size)
C. CMWD Incident Report Addendum submitted on April 26, 2022 D. 2022 CUSD Recycled Water Cross-Connection Test Date Schedule cc: Geoff Patnoe, Assistant Executive Manager
Celia Brewer, General Counsel
Gary Barberio, Deputy City Manager, Community Services
Laura Rocha, Deputy City Manager, Administrative Services Robby Contreras, Assistant General Counsel
Jeff Murphy, Community Development Director
Kristina Ray, Communication & Engagement Director
Dave Padilla, Engineering Manager/District Engineer
Babaq Taj, Engineering Manager
Jason Geldert, Engineering Manager
Eric Sanders, Utilities Manager
Tim Carroll, Senior Engineer
Andrew Wilson, Utilities Supervisor
March 16, 2022
Sean Sterchi, PE
San Diego District Engineer
State Water Resources Control Board
Division of Drinking Water
P.O. Box 100
Sacramento, CA 95812-0100-
Dear Mr. Sterchi
Ccarlsbad
Municipal Water District
EMAIL: [email protected]
The Carlsbad Municipal Water District is pleased to submit the attached Recycled Water Cross Connection Incident Report for Hope Elementary School, Carlsbad Unified School District dated March 15, 2022.

The attached report provides information related to a recycled water cross-connection discovered at Hope Elementary School located at 3010 Tamarack Avenue, Carlsbad, CA and the Carlsbad Municipal Water District's subsequent response.

Please feel free to contact me at [email protected] or call my direct line 442-339- 2307 or mobile 760-443-8879 if you have any questions.

Sincerely,
£�� f c.Cai/L�
Vicki V. Quiram
General Manager
Attachment: Recycled Water Cross-Connection Incident Report dated March 15, 2022 cc: Scott Chadwick, Executive Manager
Geoff Patnoe, Assistant Executive Manager
Celia Brewer, General Counsel
Paz Gomez, Deputy City Manager, Public Works
Carlsbad Municipal Water District
5950 El Camino Real I Carlsbad, CA 92008 I 442-339-2722 t

ATTACHMENT A

RECYCLED WATER

CROSS-CONNECTION

INCIDENT REPORT
FOR

HOPE ELEMENTARY SCHOOL,

CARLSBAD UNIFIED SCHOOL DISTRICT
March 15, 2022
Ccarlsbad
Municipal Water District
Incident Report: Hope Elementary School, 3010 Tamarack Ave, Carlsbad, CA 92010 Mar. 15, 2022
TOC 1
Table of Contents

1.0 Introduction ................................................................................................................... 1

2.0 Cross-Connection Discovery ............................................................................................ 1

3.0 Enrollee’s Response to Cross-Connection (Chronologic Narrative of Actions) ................. 1

4.0 Hope School Recycled Water Use Site Certification/Site Utilities Plan ............................. 8

5.0 Recommended Actions ................................................................................................... 9 Attachments
A. Email from Hope E
lementary School Principal water complaint, dated February 8, 2022 B. Water quality test results requested by CUSD, Erickson-Hall Construction company C. DDW course of actions
D. Erickson-Hall drawing sheets
E. Potable Backflow prevention device test certification F. County of San Diego, DEHQ Recycled Water Test, dated February 24, 2022 G. School closure notification, dated February 25, 2022 H. Hope Elementary School map
I. E. coli sample results for February 25 and 26, 2022
J. Email notification from State DDW to reopen school, dated February 28, 2022 K. CUSD Notice to Re-open
L. CUSD FAQs February 28, 2022
M. Email from Erickson-Hall to CMWD, dated August 17, 2020 N. Email from CMWD recommending Highline, August 28, 2020 Page | 1 Incident Report – Hope Elementary School, 3010 Tamarack Ave, Carlsbad, CA 92010 Mar. 15, 2022

CROSS -CONNECTION

INCIDENT REPORT

1.0 Introduction
This re
port provides information related to a recycled water cross-connection discovered at Hope Elementary School (Hope School), located at 3010 Tamarack Avenue, Carlsbad, CA and the Carlsbad Municipal Water District’s (CMWD) subsequent response.

2.0 Cross-Connection Discovery
On Thursday, February 24, 2022, at approximately 8:00 a.m., CMWD received a call from Tyler Ennis, Project Manager for Erickson-Hall, Carlsbad Unified School District’s (CUSD) construction contractor, requesting assistance with a water quality issue at Hope School. Mr. Ennis indicated that recent samples taken at the school showed higher levels of copper than would normally be found in potable water. CMWD immediately responded to the school and began an investigation.

At approximately 8:25 a.m., CMWD arrived on the school property. A chronology of the events that followed are summarized in the following section.

3.0 Enrollee’s Response to Cross-Connection (Chronologic Narrative of Actions) February 24, 2022 (unless otherwise noted)

3.1 Upon arrival at Hope School, CMWD staff met with Derrick Anderson, CUSD’s Construction Director, to discuss the reported water quality sampling done by Erickson-Hall that showed elevated levels of constituents. CMWD immediately took new baseline total dissolved solids (TDS) samples at the potable water backflow prevention device (result: 440 mg/l concentration) and the recycled irrigation system quick coupler (result: 900 mg/l concentration). Mr. Anderson then showed CMWD containers of water samples in Classroom 34 CUSD had previously collected at an unknown time. (Photos 1 and 2).

Page | 2 Incident Report – Hope Elementary School, 3010 Tamarack Ave, Carlsbad, CA 92010 Mar. 15, 2022

3.2 CMWD tested a water s
ample from the classroom faucet. The water was
discolored and odorous. CMWD’s test showed a TDS concentration of 740 mg/l, significantly higher than measured in the baseline potable water sample, which confirmed the school’s potable water system was likely contaminated with recycled water. CMWD shut off the potable water supply at the public meter, yet water was still reaching classrooms through the school’s private water system.

This further confirmed a cross-connection existed.

3.3 CMWD closed the public potable water supply connection at the CMWD meter and notified the San Diego County Department of Environmental Health and Quality (County DEHQ) and the State Water Resource Control Board, Division of Drinking Water (State DDW) of the CUSD plumbing system cross-connection.

CUSD closed the campus and students, teachers and other staff were sent home for the remainder of the day.

3.4 CMWD began investigating the private plumbing systems on the campus with the assistance of CUSD, Erickson-Hall, and its plumbing subcontractor. CMWD discovered a flexible hose connection at the back of Classroom 35 (Photo 3 below) which connected the irrigation line to the potable water line. Later in the day, as the investigation continued, CMWD requested that the CUSD plumbing subcontractor disconnect the hose (Photo 4 below).

Photo 2 - Water from Classroom 34 left out by school on counter at unknown time. Note green deposits in upper
right.

Photo 1 Water sample found from
Classroom 34 collected at unknown
time
Page | 3 Incident Report – Hope Elementary School, 3010 Tamarack Ave, Carlsbad, CA 92010 Mar. 15, 2022

3.5 While investig
ating the site, a plumbing subcontractor informed Eric Sanders, CMWD Utilities Manager, that the plumbing subcontractor had made the connection.

3.6 CMWD does not know the exact date the cross-connection occurred. However, CUSD indicated the construction contractor began painting the pipes in Photo 3 white around July 7, 2021 and the flexible hose was installed sometime after the painting.

3.7 Additionally, on February 25, 2022, Mr. Anderson told CMWD that food services staff, teachers and students began complaining about water quality in August 2021. Mr. Anderson sent an email to CMWD that includes a complaint of yellow water and residue from the principal, Ms. Rossiter. The same email chain also indicates that Erickson-Hall sampled and tested the water on April 21, 2021, August 13, 2021, September 10, 2021, and January 11, 2022 (Attachment A). - The test reports (Attachment B) provided by CUSD indicate the testing actually took place on March 31, 2021, August 11, 2021, November 9, 2021, and January 11, 2022. All four samples were tested for E. coli, which was not detected. The report from January 11, 2022 indicates that the sample was tested for other analytes normally present in recycled water and several were detected.

Photo 3 - Piping at Classroom 35 upon arrival. The
flexible plumbing pipe cross-connected potable and
recycled water systems.

Photo 4 – Piping at classroom 35 after cross-
connection removed later in the day.

Page | 4 Incident Report – Hope Elementary School, 3010 Tamarack Ave, Carlsbad, CA 92010 Mar. 15, 2022
The school continued to operate its private plumbing and irrigation systems until February 24, 2022, when CUSD contacted CMWD.

3.8 State DDW, County DEHQ and CMWD, with the cooperation of CUSD and its contractors, began working together to correct the situation. The State DDW prescribed a course of action (Attachment C), which CMWD and County DEHQ followed with cooperation from CUSD and Erickson-Hall.

3.9 CMWD reviewed the Recycled Water Use Site Plan approved for the school site when County DEHQ and CMWD approved the conversion of the school’s irrigation system to recycled water in 2017. Neither CUSD nor its construction contractor submitted plans to the City or County DEHQ for approval of modification of the school’s recycled water irrigation system as part of CUSD’s current construction activities.

3.10 On February 24, CMWD requested plans for the school’s plumbing system. On February 25, Mr. Ennis from Erickson-Hall provided five drawing sheets: A111- Overall Site Plan, A124-Enlarged Site Plan New Classroom Building, P101- Plumbing Site Plan, C005-Site Utilities Plan, C006-Site Utilities Plan, and C007- Site Utilities Plan (Attachment D), all approved in June 2020 by the Division of the State Architect for the new construction. None of the sheets show modifications to the school’s recycled water system. In addition, the back area of the school site where the cross-connection occurred is not depicted on the drawing sheets. While drawing sheet C005 shows a 2” irrigation line running under one of the new classroom buildings, Building H, CUSD did not provide plumbing plans for relocation of this irrigation line, which had been relocated.

3.11 CMWD performe
d an i
nitial test of the potable water backflow prevention
device to confirm proper operation of the device. The test certification for the potable water backflow prevention device was submitted by email to State DDW on February 24, 2022 (Attachment E). County DEHQ completed its report on February 27, 2022 (Attachment F).

3.12 CMWD staff install ed
a pressure recorder on the potable water backflow
prevention device, test cock #4, with the potable water supply off and the recycled water supply remaining on, to confirm a recycled water cross- connection. A rise in pressure was observed at the recorder, verifying the cross- connection was reaching the entire school property.

Page | 5 Incident Report – Hope Elementary School, 3010 Tamarack Ave, Carlsbad, CA 92010 Mar. 15, 2022

3.13 CMWD directed CUSD to physically sever the cross-connection previously identified behind Classroom 35 and instructed the CUSD contractor mark the recycled water pipe in purple. (Photo 5).

3.14 CMWD, under the direc ti
on of State DDW, and with County DEHQ oversight,
performed part one of a 2-way test, which is a 4-hour test of the school’s private water system.

3.15 As ordered by State DDW, CUSD sent an email notification of school closure for Friday, February 25, 2022 (Attachment G).

3.16 CMWD staff flushed and began introducing chlorine into the school’s potable plumbing system in accordance with standard AWWA C651. CMWD used the slug method with 100 mg/l concentration of chlorine as a disinfectant which is to remain in the pipe for at least three hours. The chlorinated water remained in the private plumbing system for ten hours and averaged at least 100 mg/l of free chlorine. The water in the private plumbing system was then thoroughly flushed and tested periodically for chlorine residual until a total chlorine residual of normal system potable water, approximately 3 mg/l, was reached.

February 25, 2022 (unless otherwise noted)

3.17 Following the disinfection procedure, CMWD returned to the school and confirmed the chlorine residual at each faucet and flushed the super-chlorinated water. After normal system water was introduced to the school’s plumbing, CMWD took the first round of samples for bacteriological testing from 11 sites throughout the school as shown on the map of the Hope School buildings and sampling locations (Attachment H). After 24 hours, and after receiving results Photo 5 - Cross-connection removed at classroom 35.

Page | 6 Incident Report – Hope Elementary School, 3010 Tamarack Ave, Carlsbad, CA 92010 Mar. 15, 2022
showing the absence of E. Coli bacteria in the first round of samples, CMWD took the second round of samples and tested them on February 26, 2022. CMWD also directed CUSD to replace the filters at all drinking fountains, which CMWD oversaw.

On Sunday, February 27, the test results for the second round of samples came back absent for E. Coli bacteria. CMWD communicated this information to State DDW, and State DDW indicated the water in the school plumbing was safe.

CMWD subsequently submitted the test results to County DEHQ and State DDW (Attachment I).

3.18 CMWD performe d, under
the direction of State DDW, and as part two of the 2-
way test, a 24-hour test on the recycled water irrigation system. Upon completion of the test on February 26, the test report was sent to County DEHQ.

The recycled water meter was removed and the meter valve was locked off by CMWD (Photo 6). There has been no recycled water service to the school site since that time.

3.19 On Sunday, February 27, 2022, State DDW approved the corrective actions taken and deemed the water quality test results acceptable and granted approval to reopen the school (Attachment J).

3.20 CUSD reopened the school on Monday, February 28, 2022 (Attachments K) and provided information about the incident to the parents and staff (Attachment L).

Photo 6 - Recycled water meter
removed and meter valve locked off.

Page | 7 Incident Report – Hope Elementary School, 3010 Tamarack Ave, Carlsbad, CA 92010 Mar. 15, 2022
February 28 – current

3.21 CMWD staff have continued to work with CUSD and CUSD’s construction contractor to expose the school’s recycled water irrigation system and assure that all irrigation piping is separate from any other system. No additional cross- connection locations have been found.

3.22 The meter that previously served recycled water to this site has been removed and the school has no connection to the recycled water system at this time.

Hope School will not be allowed to connect back to the recycled water system until CUSD submits landscape and irrigation plans to CMWD and County DEHQ for approval. On March 10, 2022, CMWD provided CUSD and CUSD’s construction contractor the following steps that must be taken prior to reconnection of the school’s recycled water irrigation system.

3.22.1 CUSD’s construction contractor, under the direction of CUSD , must
excavate areas identified by CMWD and County DEHQ staff to verify the potable water line cross-connected with irrigation system is fully abandoned at the point of connection(s).

3.22.2 CUSD will submit current irrigation plans for the entire school site, along with an E-27 water meter permit application to the city’s Land Development and Engineering Department. These plans must include a temporary potable high line as well as any alterations to the school’s recycled water irrigation system.

3.22.3 Once routed to CMWD via the Land Development and Engineering Department, the plans will be reviewed by CMWD and County DEHQ.

3.22.4 The old potable irrigation service still on site will be utilized as the feed for the temporary potable high line to irrigation system.

3.22.5 CUSD must instruct its construction contractor to expose all piping around the current recycled meter box and the old potable irrigation meter box, including the two-inch backflow still on site.

3.22.6 The two-inch backflow on the old potable irrigation line will be tested by CUSD and witnessed by CMWD and must pass in order for a meter to be issued. If the backflow test does NOT pass, a new device must be installed.

Page | 8 Incident Report – Hope Elementary School, 3010 Tamarack Ave, Carlsbad, CA 92010 Mar. 15, 2022

3.22.7 After the backflow testing and the connection between the irrigation line and the old potable irrigation line is made and observed with CMWD cross-connection oversight, potable water can be introduced to the site utilizing this connection.

3.23 Future connection to recycled supply for irrigation:

3.23.1 After approval of new landscape and irrigation plans by County DEHQ and CMWD, CMWD, along with County DEHQ oversight, will then schedule and perform a cross-connection test for the site.

3.23.2 After successful completion of the cross-connection test, a recycled meter can be issued and installed on site, and CUSD can disconnect the temporary potable feed, with CMWD oversight, and reconnect the existing irrigation to the recycled water meter.

4.0 Hope School Recycled Water Use Site Certification/Site Utilities Plan

4.1 On April 7, 2017, County DEHQ issued a Recycled Water Use Site Certification, LRWS 2015-359, following successful completion of cross-connection testing in accordance with State, County and CMWD regulations governing the use of recycled water. At that time, portions of the irrigation system for Hope School were converted from potable to recycled water supply.

4.2 This 2017 certification and the CMWD Rules and Regulations for Recycled Water Use, which are provided to the water user, such as CUSD, upon site certification, require the designation of a Site Supervisor. The Site Supervisor is responsible for the operation, maintenance or alteration of the on-site recycled water irrigation system, including the requirement to submit plans for review and approval by CMWD and County DEHQ before making any changes to the on-site recycled water system.

4.3 The Hope School Site Utilities Plan relating to the current construction activities at Hope School was approved by the Division of State Architect in June 2020 and construction at Hope School was underway in the summer of 2020.

4.4 The city issued a Stop Work Order to CUSD on July 30, 2020 because the city had not received an application for a grading permit for grading work being performed at Hope School. Around this same time period, CMWD reminded CUSD that any changes to the school’s recycled water irrigation system would require approval from CMWD and County DEHQ. Although CUSD sent an email Page | 9 Incident Report – Hope Elementary School, 3010 Tamarack Ave, Carlsbad, CA 92010 Mar. 15, 2022
indicating that it did not believe its construction related plumbing activities implicated the school’s recycled water system (Attachment M), CMWD recommended CUSD install a temporary potable high line for the irrigation system to avoid any potential for a cross-connection (Attachment N).

4.5 On February 24, 2022, when CMWD responded to Hope School, construction at the school was proceeding despite the Stop Work Order that had been issued by the City. CUSD or its contractor had not submitted landscape and irrigation plans to the city, which are reviewed and approved by CMWD and the County DEHQ before the installation of, or modifications to a recycled irrigation system.

4.6 As described above in Section 3.10, CUSD’s construction contractor recently provided the city with five drawing sheets. No modifications to the school’s recycled water irrigation system are shown on these drawings. While drawing sheet C005 shows a 2” irrigation line running under one of the new classroom buildings, Building H, irrigation plans have not been submitted to CMWD. The irrigation line under Building H has been relocated. The cross-connection location was not on the relocated line but in an area not shown on the drawings.

5.0 Recommended Actions
Additionally, CMWD will perform the following actions:

5.1 Schedule cross-connection with County DEHQ for other CUSD schools served by CMWD that have recycled water irrigation systems and have undergone recent construction work on plumbing or irrigation systems to ensure compliance with regulatory standards.

5.2 Modify CMWD Recycled Water Rules and Regulations to assign Site Supervisor status to a person in a management or executive management position of authority in the water user entity for compliance with potable and recycled water regulations.

5.3 Request assistance from the State DDW and County DEHQ to reinforce CMWD’s authority over recycled water regulations at school sites.

Incident Report – Hope Elementary School, 3010 Tamarack Ave, Carlsbad, CA 92010 Mar. 15, 2022

ATTACHMENT A
1 Jeanette Brown
Subject: FW: Water
Attachments: 21L0667 1_Report_&_COC FINAL 01 11 22 1526.pdf From: Derrick Anderson <[email protected]> Sent: Friday, February 25, 2022 12:12 PM
To: Eric Sanders <[email protected]>; Vicki Quiram <[email protected]> Cc: Eric Dill <[email protected]>; Jessica Kimbrell <[email protected]>; Byron <byron@ppc‐ sd.com>; Derrick Anderson <derrick@ppc‐sd.com>
Subject: Fwd: Water
Good afternoon Ms. Quiram and Mr. Sanders,
Thank you again for the collaboration at Hope ES yesterday and today. We look forward to completing the testing and inspection work necessary to resume campus operations as soon as approvals are attained.

As promised during our site meeting this morning, below please find the second round of water testing that was conducted by CUSD's contra
ctor, Erickson‐Hall (EHCC), for the Hope ES modernization project. You will find the narrative prepared by EHCC, along with the site map depicting the sampling and flushing locations. Also attached is the analytical results of the water sampling/testing.

I will send you the first test results conducted by EHCC under separate email .

CUSD looks forward to a meeting in the near future with City of Carlsbad executive staff to continue and improve the collaborative efforts needed for us to successfully deliver CUSD projects.

Sincerely,
Derrick
‐‐‐‐‐‐‐‐‐‐ Forwarded message ‐‐‐‐‐‐‐‐‐
From: Derrick Anderson <[email protected]> Date: Thu, Feb 24, 2022 at 2:12 PM
Subject: Fwd: Water
To: Eric Dill <[email protected]>
Cc: Jessica Kimbrell <[email protected]> Hi Eric,
Here is the most recent testing summary provided by Erickson‐Hall via their plumber. Please let me know if you have any questions.

Best,
Derrick
2 ‐‐‐‐‐‐‐‐‐‐ Forwarded message ‐‐‐‐‐‐‐‐‐
From: Alex Alon <[email protected]>
Date: Wed, Feb 9, 2022 at 10:34 AM
Subject: RE: Water
To: Derrick Anderson <[email protected]> Cc: Brian Litchfield <[email protected]>, John Thomas <[email protected]>, Tyler Ennis <[email protected]>
Derrick,
Please see the attached report. I reached out to Gary at Interpipe one more time to make sure I had the correct information. I tried to organize the info in the best wa y. Here is the summary to date, findings and some
recommendations:
 We performed a 4th test with results on 1/11/22. Testing history as follows.

1. 4/21 preliminary test for E.coli & Bac‐T

2. 8/13 Testing as required for turnover for E.Coli & Bac‐T

3. 9/10
Testing in response to concerns from the school for E.Coli & Bac‐T

4. 1/11
(attached)‐ most recent test further investigating. Include s E.Coli & Bac‐t as well as Odor and Color.
 The most recent test still shows the water is within standards for safe drinking water (e.coli and Bac‐t).  Prior to the final test, our team performed multiple visual inspecti ons and building flushing in early December at multiple locations and prior to the most recent test. Results were mixed. In certain buildings water was clear and upon return on a different day, would have faint traces of color then clear again on another day.  Our field investigations have narrowed the potential source location to the North side of the campus. Specifically the main that runs by Building A and west between buildings F & J The South side showed no visual traces of color.  The work that was performed in the area above was to an existing main pipe. Our connection points were existing copper. We assume the entire main (existing portions to remain) heading East/West was copper as well. Per plans we installed new PVC pipe to parts of the existing copper pipe to modify the main for the new buildings.  There is an existing vault somewhere by the drive that was not part of this project (I personally have not seen this vault). We believe this is the source for the domestic water. We did not check anything there.  When reviewing the most recent test results, it appears the color/odor may be coming from trace metals found in the report. This is only an observation that we are making. We recommend the report is reviewed with someone familiar with EPA regulation requirements in this regards.
 We have not seen or heard reports of ground water coming to the surface in the suspect area that could be an indication of a water break.
3  We have not seen or heard reports of a loss in water pressures that could be an indication of a water break.  Recommendations
o Find out if there are any anomalies in water usage and or after hour meters running to see if there could be a water main brea
k
o Check with the city to see if the incoming water has issues. o Understand what is in the existin
g vault at the drive area to see if there could be something there? o Look at replacing the old copper mains with PVC.

I hope this information is useful
. Let me know if there is anything else we can do on this.

Thanks,
Alex Alon
Project Executive
Erickson‐Hall Construction Co.

O: 760.796.7700 | F: 760.796.7750 | M: 760.670.8487
From: Derrick Anderson <[email protected]> Sent: Tuesday, February 8, 2022 11:52 AM
To: Alex Alon <[email protected]>
Cc: Brian Litchfield <[email protected]>; John Thomas <[email protected]> Subject: Fwd: Water
Good morning Alex,
It looks like a striking coincidence that this email came in just as we were talking about the water quality issue at Hope.

Looking forward to your email with the test results and full report. 4 Best regards,
Derrick
‐‐‐‐‐‐‐‐‐‐ Forwarded message ‐‐‐‐‐‐‐‐‐
From: Ashley Rossiter <[email protected]>
Date: Tue, Feb 8, 2022 at 11:37 AM
Subject: Water
To: Derrick Anderson <[email protected]> Hi Derrick,
The water from the water bottle fi
lling station and the drinking fountain is coming out
yellow. Based on this and the cup of residue I gave you last week, I was wondering what the status of this concern is and what the next steps are. Is it possible to expedite this issue being addressed?
Ashley Rossiter
Principal
Hope Elementary School
Carlsbad Unified School District
760.331.5999
‐‐
Derrick Anderson, P.E., CCM
Director, Construction Management & Facilities
Carlsbad Unified School District
P: (760) 331‐5022
5 C: (858) 335‐5819
[email protected]
‐‐
Derrick Anderson, P.E., CCM
Bond Program Manager
Carlsbad Unified School District
P: (760) 331‐5022
C: (858) 335‐5819
derrick.anderson@carls
badusd.net
‐‐
Derrick Anderson, P.E., CCM
Bond Program Manager
Carlsbad Unified School District
P: (760) 331‐5022
C: (858) 335‐5819
derrick.anderson@carls
badusd.net
CAUTION: Do not open attachments or click on links unless you recognize the sender and know the content is safe.

Incident Report – Hope Elementary School, 3010 Tamarack Ave, Carlsbad, CA 92010 Mar. 15, 2022

ATTACHMENT B
EnviroMatrix Analytical, Inc.

Interpipe Contracting, Inc.

Hope Es.

Santee, CA 92071
10870 Hartley Road
Rolf Wachter
Enclosed are the results of analyses for samples received by the laboratory on 03/31/21 15:45. Samples were analyzed pursuant to client request utilizing EPA or other ELAP approved methodologies. I certify that this data is in compliance both technically and for completeness. 02 April 2021
Attn:

EMA Log #: 21C1151
Laboratory Director
Leland S. Pitt
CA ELAP Certification #: 2564
Project:
9590 Chesapeake Dr. - San Diego, California 92123 - (858) 560-7717 - Fax (858) 560-7763 Analytical Chemistry Laboratory
PLEASE NOTE OUR NEW LOCATION:

Project Name:

Interpipe Contracting, Inc.Client Name: EMA Log #: 21C1151 Hope Es.

Sample ID Laboratory ID Matrix Date Sampled

ANALYTICAL REPORT FOR SAMPLES
Date Received
Classroom Sink 1 21C1151-01 03/31/21 13:45 03/31/21 15:45Drinking Water Classroom Sink 2 21C1151-02 03/31/21 13:45 03/31/21 15:45Drinking Water
Classroom Sink 3 21C1151-03 03/31/21 13:45 03/31/21 15:45Drinking Water Classroom Sink 4 21C1151-04 03/31/21 13:45 03/31/21 15:45Drinking Water The results in this report apply to the samples analyzed in accordance with the chain of custody document. This analytical report must be reproduced in its entirety.

Page 2 of 4 ends

EnviroMatrix Analytical, Inc.

Project Name:

Interpipe Contracting, Inc.Client Name: EMA Log #: 21C1151 Hope Es.

Mic
robiological Parameters by Standard Methods
Analyte Result MDL Limit
Reporting
Units Dilution Batch
Sample Prepared
Sample Analyzed Method Notes Analyst
Classroom Sink 1 (21C1151-01) Drinking Water Sampled: 03/31/21 13:45 Received: 03/31/21 15:45 SM922303/31/21 15:02
04/01/21 15:33
None 10401311Total Coliforms Absent CC
"03/31/21 15:02
04/01/21 15:33
" ""E. Coli Absent CC
Classroom Sink 2 (21C1151-02) Drinking Water Sampled: 03/31/21 13:45 Received: 03/31/21 15:45 SM922303/31/21 15:02
04/01/21 15:33
None 10401311Total Coliforms Absent CC
"03/31/21 15:02
04/01/21 15:33
" ""E. Coli Absent CC
Classroom Sink 3 (21C
1151-03) Drinking Water Sampled: 03/31/21 13:45 Received: 03/31/21 15:45 SM922303/31/21 15:02
04/01/21 15:33
None 10401311Total Coliforms Absent CC
"03/31/21 15:02
04/01/21 15:33
" ""E. Coli Absent CC
Classroom Sink 4 (21C1151-04) Drinking Water Sampled: 03/31/21 13:45 Received: 03/31/21 15:45 SM922303/31/21 15:02
04/01/21 15:33
None 10401311Total Coliforms Absent CC
"03/31/21 15:02
04/01/21 15:33
" ""E. Coli Absent CC
The results in this report apply to the samples analyzed in accordance with the chain of custody document. This analytical report must be reproduced in its entirety.

Page 3 of 4 ends

EnviroMatrix Analytical, Inc.

Project Name:

Interpipe Contracting, Inc.Client Name: EMA Log #: 21C1151 Hope Es.

Notes and Definitions
A-03 Absent
Sample results reported on a dry weight basis (if indicated in units column) Relative Percent DifferenceRPD
dry
Not ReportedNR
Analyte NOT DETECTED at or above the reporting limit (or method detection limit when specified)ND MDL Method detection limit (indicated per client's request) The results in this report apply to the samples analyzed in accordance with the chain of custody document. This analytical report must be reproduced in its entirety.

Page 4 of 4 ends

EnviroMatrix Analytical, Inc.
, \ C , ,-� 'J ----- , 11< ...

CHAIN-OF-CUSTODY RECORD � l \ \S \ :rs;- -EnviroMatrix 0 Analytical, Inc.

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EnviroMatrix Analytical, Inc.

Interpipe Contracting, Inc.

Hope Elementary
Santee, CA 92071
10870 Hartley Road
Ken Brown
Enclosed are the results of analyses for samples received by the laboratory on 08/11/21 14:32. Samples were analyzed pursuant to client request utilizing EPA or other ELAP approved methodologies. I certify that this data is in compliance both technically and for completeness. 13 August 2021
Attn:

EMA Log #: 21H0353
Laboratory Director
Leland S. Pitt
CA ELAP Certification #: 2564
Project:
9590 Chesapeake Dr. - San Diego, California 92123 - (858) 560-7717 - Fax (858) 560-7763 Analytical Chemistry Laboratory
PLEASE NOTE OUR NEW LOCATION:

Project Name:

Interpipe Contracting, Inc.Client Name: EMA Log #: 21H0353 Hope Elementary
Sample ID Laboratory ID Matrix Date Sampled

ANALYTICAL REPORT FOR SAMPLES
Date Received
BUILDING K FRONT BUBBLER 21H0353-01 08/11/21 13:00 08/11/21 14:32Drinking Water BUILDING K REAR BUBBLER 21H0353-02 08/11/21 13:00 08/11/21 14:32Drinking Water BUILDING K DRINK FNTN. 21H0353-03 08/11/21 13:00 08/11/21 14:32Drinking Water BUILDING G FRONT BUBBLER 21H0353-04 08/11/21 13:06 08/11/21 14:32Drinking Water BUILDING G BACK BUBBLER 21H0353-05 08/11/21 13:06 08/11/21 14:32Drinking Water BUILDING G DRNK. FNTN. 21H0353-06 08/11/21 13:06 08/11/21 14:32Drinking Water BUILDING J FRONT BUBBLER 21H0353-07 08/11/21 13:12 08/11/21 14:32Drinking Water BUILDING J BACK BUBBLER 21H0353-08 08/11/21 13:12 08/11/21 14:32Drinking Water BUILDING J DRNK FNTN 21H0353-09 08/11/21 13:12 08/11/21 14:32Drinking Water BUILDING A NURSE STATION 21H0353-10 08/11/21 13:21 08/11/21 14:32Drinking Water BUILDING C CLASSROOM SINK 21H0353-11 08/11/21 13:30 08/11/21 14:32Drinking Water KITCHEN BOILER 21H0353-12 08/11/21 13:35 08/11/21 14:32Drinking Water The results in this report apply to the samples analyzed in accordance with the chain of custody document. This analytical report must be reproduced in its entirety.

Page 2 of 5 ends

EnviroMatrix Analytical, Inc.

Project Name:

Interpipe Contracting, Inc.Client Name: EMA Log #: 21H0353 Hope Elementary
Mic
robiological Parameters by Standard Methods
Analyte Result MDL Limit
Reporting
Units Dilution Batch
Sample Prepared
Sample Analyzed Method Notes Analyst
BUILDING K FRONT BUBBLER (21H0353-01) Drinking Water Sampled: 08/11/21 13:00 Received: 08/11/21 14:32 SM922308/11/21 15:00
08/12/21 16:01
None 10811691Total Coliforms Absent CC
"08/11/21 15:00
08/12/21 16:01
" ""E. Coli Absent CC
BUILDING K REAR BUBBLER (21H0353-02) Drinking Water Sampled: 08/ 11/21 13:00 Received: 08/11/21 14:32
SM922308/11/21 15:00
08/12/21 16:01
None 10811691Total Coliforms Absent CC
"08/11/21 15:00
08/12/21 16:01
" ""E. Coli Absent CC
BUILDING K DRINK FNTN. (21H0353-03) Drinking Water Sampled: 08/11/21 13:00 Received: 08/11/21 14:32 SM922308/11/21 15:00
08/12/21 16:01
None 10811691Total Coliforms Absent CC
"08/11/21 15:00
08/12/21 16:01
" ""E. Coli Absent CC
BUILDING G FRONT BUBBLER (21H0353-04) Drinking Water Sampled: 08/11/21 13:06 Received: 08/11/21 14:32 SM922308/11/21 15:00
08/12/21 16:01
None 10811691Total Coliforms Absent CC
"08/11/21 15:00
08/12/21 16:01
" ""E. Coli Absent CC
BUILDING G BACK BUBBLER (21H0353-05) Drinking Water Sampled: 08/11/21 13:06 Received: 08/11/21 14:32 SM922308/11/21 15:00
08/12/21 16:01
None 10811691Total Coliforms Absent CC
"08/11/21 15:00
08/12/21 16:01
" ""E. Coli Absent CC
BUILDING G DRNK. FNTN. (21H0353-06) Drinking Water Sampled: 08/11/21 13:06 Received: 08/11/21 14:32 SM922308/11/21 15:00
08/12/21 16:01
None 10811691Total Coliforms Absent CC
"08/11/21 15:00
08/12/21 16:01
" ""E. Coli Absent CC
BUILDING J FRONT BUBBLER (21H0353-07) Drinking Water Sampled: 08/11/21 13:12 Received: 08/11/21 14:32 SM922308/11/21 15:00
08/12/21 16:01
None 10811691Total Coliforms Absent CC
"08/11/21 15:00
08/12/21 16:01
" ""E. Coli Absent CC
The results in this report apply to the samples analyzed in accordance with the chain of custody document. This analytical report must be reproduced in its entirety.

Page 3 of 5 ends

EnviroMatrix Analytical, Inc.

Project Name:

Interpipe Contracting, Inc.Client Name: EMA Log #: 21H0353 Hope Elementary
Mic
robiological Parameters by Standard Methods
Analyte Result MDL Limit
Reporting
Units Dilution Batch
Sample Prepared
Sample Analyzed Method Notes Analyst
BUILDING J BACK BUBBLER (21H0353-08) Drinking Water Sampled: 08/11/21 13:12 Received: 08/11/21 14:32 SM922308/11/21 15:00
08/12/21 16:01
None 10811691Total Coliforms Absent CC
"08/11/21 15:00
08/12/21 16:01
" ""E. Coli Absent CC
BUILDING J DRNK FNTN (21H0353-09) Drinking Water Sampled: 08/ 11/21 13:12 Received: 08/11/21 14:32
SM922308/11/21 15:00
08/12/21 16:01
None 10811691Total Coliforms Absent CC
"08/11/21 15:00
08/12/21 16:01
" ""E. Coli Absent CC
BUILDING A NURSE STATION (21H0353-10) Drinking Water Sampled: 08/11/21 13:21 Received: 08/11/21 14:32 SM922308/11/21 15:00
08/12/21 16:01
None 10811691Total Coliforms Absent CC
"08/11/21 15:00
08/12/21 16:01
" ""E. Coli Absent CC
BUILDING C CLASSROOM SINK (21H0353-11) Drinking Water Sampled: 08/11/21 13:30 Received: 08/11/21 14:32 SM922308/11/21 15:00
08/12/21 16:01
None 10811691Total Coliforms Absent CC
"08/11/21 15:00
08/12/21 16:01
" ""E. Coli Absent CC
KITCHEN BOILER (21H0353-12) Drinking Water Sampled: 08/11/21 13:35 Received: 08/11/21 14:32 SM922308/11/21 15:00
08/12/21 16:01
None 10811691Total Coliforms Absent CC
"08/11/21 15:00
08/12/21 16:01
" ""E. Coli Absent CC
The results in this report apply to the samples analyzed in accordance with the chain of custody document. This analytical report must be reproduced in its entirety.

Page 4 of 5 ends

EnviroMatrix Analytical, Inc.

Project Name:

Interpipe Contracting, Inc.Client Name: EMA Log #: 21H0353 Hope Elementary
Notes and Definitions
A-03 Absent
Sample results reported on a dry weight basis (if indicated in units column) Relative Percent DifferenceRPD
dry
Not ReportedNR
Analyte NOT DETECTED at or above the reporting limit (or method detection limit when specified)ND MDL Method detection limit (indicated per client's request) The results in this report apply to the samples analyzed in accordance with the chain of custody document. This analytical report must be reproduced in its entirety.

Page 5 of 5 ends

EnviroMatrix Analytical, Inc.

CHAIN-OF-CUSTODY RECORD
2\ rt 0b�3,
-EnviroMatrix 0 Analytical, Inc.

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Attn:

Sarnplers(s):

Address:

Phone: Fax:

Email:

Billing Address:

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1Additional costs may apply. Please note there is a $35 minimum charge for all client�. 2EMA reserves the right to return any samples that do not match our waste profile. 9590 Chesapeake Dr. Suite 5 - San Diego, CA 92123 - Phone (619) Ii ug-
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NOTE: By relinquishing samples to EMA, Inc., client agrees to pay for the services requested on this COC form and any additional anolyscs perfonned on this project. Payment for services is due within 30 days from date of invoice. Samples will be disposed of? days after report has been finalized unless otherwise noted. All work is subject to EM A's tenns and conditions. ~
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EMA LOG#: 11t7,!;J?..f1f'e
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Matrix Codes: A= Air, DW c;c- Drinking Water, GW = Groundwater. S\V = Storm Water WW � Wastewater. S � Soil, SED � Sediment, SD� Solid, T � Tissue, 0 � Oil, L � Liquid Shipped By: u Courier Cl UPS u FedEx re USPS n Client Drop Off CJ Other 1Turn-Around-Timc: :J Same Day � day u 2 day lJ 3 day u 4 day o 5 day u STD ( 7-busine�s days) 1Rcporting Rc(JUirements: r:J PDF ::=i Excel c:1 Geotracker/EDF cJ Hard Copy u EDT Ll CEDEN u SDWIS 1Samplc Disposal: ,- : By Laboratory r--i 2Return to Client: P/U or Delivery □ Archive Sample Integrity
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NOTE: By relinquishing samples to EMA, lnc., client agrees to pay for the services requested on lhis COC form and any additional analyses performed on this project. Paymem for services is due within 30 days from date of invoice. Samples wil! be <.hsposed uf 7 days after report has been finalized unless otherwise noted. All work is subject to EM A's terms and conditions. . 1
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EnviroMatrix Analytical, Inc.

Interpipe Contracting, Inc.

Hope Elementary
Santee, CA 92071
10870 Hartley Road
RJ Smith
Enclosed are the results of analyses for samples received by the laboratory on 11/09/21 11:20. Samples were analyzed pursuant to client request utilizing EPA or other ELAP approved methodologies. I certify that this data is in compliance both technically and for completeness. 10 November 2021
Attn:

EMA Log #: 21K0307
Laboratory Director
Leland S. Pitt
CA ELAP Certification #: 2564
Project:
9590 Chesapeake Dr. - San Diego, California 92123 - (858) 560-7717 - Fax (858) 560-7763 Analytical Chemistry Laboratory

PLEASE NOTE OUR NEW LOCATION
:

Project Name:

Interpipe Contracting, Inc.Client Name: EMA Log #: 21K0307 Hope Elementary
Sample ID Laboratory ID Matrix Date Sampled

ANALYTICAL REPORT FOR SAMPLES
Date Received
NURSES SINK 21K0307-01 11/09/21 09:15 11/09/21 11:20Drinking Water BUILDING A STAFF 21K0307-02 11/09/21 09:20 11/09/21 11:20Drinking Water BUILDING C CLASSROOM 21K0307-03 11/09/21 09:25 11/09/21 11:20Drinking Water CLASSROOM #10, BLDG. E 21K0307-04 11/09/21 09:30 11/09/21 11:20Drinking Water CLASSROOM #29, RE-LOCATABLE 21K0307-05 11/09/21 09:35 11/09/21 11:20Drinking Water BLDG. G - DRINKING FNTN 21K0307-06 11/09/21 09:35 11/09/21 11:20Drinking Water BLDG. H - DRINKING FOUNTAIN 21K0307-07 11/09/21 09:40 11/09/21 11:20Drinking Water BLDG. J - STAFF BATHROOM 21K0307-08 11/09/21 09:50 11/09/21 11:20Drinking Water BLDG. J - DRINKING FOUNTAIN 21K0307-09 11/09/21 10:00 11/09/21 11:20Drinking Water KITCHEN - PREP SINK 21K0307-10 11/09/21 10:05 11/09/21 11:20Drinking Water DOMESTIC BACKFLOW 21K0307-11 11/09/21 10:40 11/09/21 11:20Drinking Water The results in this report apply to the samples analyzed in accordance with the chain of custody document. This analytical report must be reproduced in its entirety.

Page 2 of 5 ends

EnviroMatrix Analytical, Inc.

Project Name:

BUILDING A STAF
F (21K0307-02) Drinking Water Sampled: 11/09/21 09:20 Received: 11/09/21 11:20 SM922311/09/21 16:00
11/10/21 16:00
None 11110331Total Coliforms Absent CC
"11/09/21 16:00
11/10/21 16:00
" ""E. Coli Absent CC
BUILDING C CLASSROOM (21K0307-03) Drinking Water Sampled: 11/09/21 09:25 Received: 11/09/21 11:20 SM922311/09/21 16:00
11/10/21 16:00
None 11110331Total Coliforms Absent CC
"11/09/21 16:00
11/10/21 16:00
" ""E. Coli Absent CC
CLASSROOM #10, BLDG. E (21K0307-04) Drinking Water Sampled: 11/09/21 09:30 Received: 11/09/21 11:20 SM922311/09/21 16:00
11/10/21 16:00
None 11110331Total Coliforms Absent CC
"11/09/21 16:00
11/10/21 16:00
" ""E. Coli Absent CC
CLASSROOM #29, RE-LOCATABLE (21K0307-05) Drinking Water Sampled: 11/09/21 09:35 Received: 11/09/21 11:20 SM922311/09/21 16:00
11/10/21 16:00
None 11110331Total Coliforms Absent CC
"11/09/21 16:00
11/10/21 16:00
" ""E. Coli Absent CC
BLDG. G - DRINKING FNTN (21K0307-06) Drinking Water Sampled: 11/09/21 09:35 Received: 11/09/21 11:20 SM922311/09/21 16:00
11/10/21 16:00
None 11110331Total Coliforms Absent CC
"11/09/21 16:00
11/10/21 16:00
" ""E. Coli Absent CC
BLDG. H - DRINKING FOUNTAIN (21K0307-07) Drinking Water Sampled: 11/09/21 09:40 Received: 11/09/21 11:20 SM922311/09/21 16:00
11/10/21 16:00
None 11110331Total Coliforms Absent CC
"11/09/21 16:00
11/10/21 16:00
" ""E. Coli Absent CC
The results in this report apply to the samples analyzed in accordance with the chain of custody document. This analytical report must be reproduced in its entirety.

Page 3 of 5 ends

EnviroMatrix Analytical, Inc.

Project Name:

Interpipe Contracting, Inc.Client Name: EMA Log #: 21K0307 Hope Elementary
Mic
robiological Parameters by Standard Methods
Analyte Result MDL Limit
Reporting
Units Dilution Batch
Sample Prepared
Sample Analyzed Method Notes Analyst
BLDG. J - STAFF BATHROOM (21K0307-08) Drinking Water Sampled: 11/09/21 09:50 Received: 11/09/21 11:20 SM922311/09/21 16:00
11/10/21 16:00
None 11110331Total Coliforms Absent CC
"11/09/21 16:00
11/10/21 16:00
" ""E. Coli Absent CC
BLDG. J - DRINKING FOUNTAIN (21K0307-09) Drinking Wate
r Sampled: 11/09/21 10:00 Received: 11/09/21 11:20 SM922311/09/21 16:00
11/10/21 16:00
None 11110331Total Coliforms Absent CC
"11/09/21 16:00
11/10/21 16:00
" ""E. Coli Absent CC
KITCHEN - PREP SINK (21K0307-10) Drinking Water Sampled: 11/09/21 10:05 Received: 11/09/21 11:20 SM922311/09/21 16:00
11/10/21 16:00
None 11110331Total Coliforms Absent CC
"11/09/21 16:00
11/10/21 16:00
" ""E. Coli Absent CC
DOMESTIC BACKFLOW (21K0307-11) Drinking Water Sampled: 11/09/21 10:40 Received: 11/09/21 11:20 SM922311/09/21 16:00
11/10/21 16:00
None 11110331Total Coliforms Absent CC
"11/09/21 16:00
11/10/21 16:00
" ""E. Coli Absent CC
The results in this report apply to the samples analyzed in accordance with the chain of custody document. This analytical report must be reproduced in its entirety.

Page 4 of 5 ends

EnviroMatrix Analytical, Inc.

Project Name:

Interpipe Contracting, Inc.Client Name: EMA Log #: 21K0307 Hope Elementary
Notes and Definitions
A-03 Absent
Sample results reported on a dry weight basis (if indicated in units column) Relative Percent DifferenceRPD
dry
Not ReportedNR
Analyte NOT DETECTED at or above the reporting limit (or method detection limit when specified)ND MDL Method detection limit (indicated per client's request) The results in this report apply to the samples analyzed in accordance with the chain of custody document. This analytical report must be reproduced in its entirety.

Page 5 of 5 ends

EnviroMatrix Analytical, Inc.
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Project ID:

Project#: /Jb;:'6 ,&,6,·i7t.:Etl/ll•:ia_ Y PO#:

Project/Sample Comments:
1Additional co�b may apply. Please note lhcre is a $35 minimum charge for all clients. 2EMA reserves the right to return any samples that do not match our waste profile.

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EMA LOG#: I / A.ITz;IZf 1/1 c
9590 Ch ke DL S 5 San ff CA 92123 - Pl (619) 474-8548
Client: ��G &/,Er'/@J7)4A, y / � Clt:$1NV - ,l'Y,4 "£.

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Sample Sample Sample Container
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Matrh Codes: A= Air, !JW = Drinking Water, (iW Ground½ater, SW - Storm Water WW� Wastewater. S � Soil, SED � Sediment, SD~ Solid, T � Tissue, 0 � Oil, L � Liquid Shipped lly: o Courier u UPS u FedEx u USPS u Client Drop Off u Other 1Turn-Around-Tirne: u Same Day }(l.day u 2 day CJ 3 day o 4 day c: 5 day u STD (7-business days) 'Reporting Requirements: u PDF D Excel □ lieotrncker/Ef)F □ Hard Copy " EDT□ CED EN □ SDWIS 1Sarnplc Disposal: G By Laboratory L; .:Return to Client: P/U or Delivery u Archive Sample Integrity ��
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NOTE: By relinquishing samples to EMA, Inc., client agrees to pay for the services requested on this ('OC form and any additional analyses performed on this project. Payment for scrvi..:es is due within 30 day� from date of invoice. Sample� will he:: dispo�ed of 7 days af1er report has been finalized unless otherwise noted. All work is subject to EMA's tenns and conditions. esapea u1te ego, 1onc
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EnviroMatrix Analytical, Inc.

Interpipe Contracting, Inc.

Hope Elementary
Santee, CA 92071
10870 Hartley Road
Gary Hiebing
Enclosed are the results of analyses for samples received by the laboratory on 12/15/21 12:05. Samples were analyzed pursuant to client request utilizing EPA or other ELAP approved methodologies. I certify that this data is in compliance both technically and for completeness. 11 January 2022
Attn:

EMA Log #: 21L0667
Laboratory Director
Leland S. Pitt
CA ELAP Certification #: 2564
Project:
9590 Chesapeake Dr. - San Diego, California 92123 - (858) 560-7717 - Fax (858) 560-7763 Analytical Chemistry Laboratory
PLEASE NOTE OUR NEW LOCATION:

Project Name:

Interpipe Contracting, Inc.Client Name: EMA Log #: 21L0667 Hope Elementary
Sample ID Laboratory ID Matrix Date Sampled

ANALYTICAL REPORT FOR SAMPLES
Date Received
Nurses Sink 21L0667-01 12/15/21 10:59 12/15/21 12:05Drinking Water Building A Staff Womens Bathroom 21L0667-02 12/15/21 11:19 12/15/21 12:05Drinking Water Building C Custodial 21L0667-03 12/15/21
11:05 12/15/21 12:05Drinking Water
Classroom #10, Bldg. E 21L0667-04 12/15/21 11:02 12/15/21 12:05Drinking Water Classroom #29, Re-Locatable 21L0667-05 12/15/21 11:09 12/15/21 12:05Drinking Water Bldg. E Bathroom 21L0667-06 12/15/21 10:56 12/15/21 12:05Drinking Water Bldg. H Bathroom 21L0667-07 12/15/21 10:50 12/15/21 12:05Drinking Water Bldg. J Staff Bathroom 21L0667-08 12/15/21 11:14 12/15/21 12:05Drinking Water Bldg. J Drinking Fountain 21L0667-09 12/15/21 11:12 12/15/21 12:05Drinking Water Kitchen Prep Sink 21L0667-10 12/15/21 11:16 12/15/21 12:05Drinking Water Building G Bathroom 21L0667-11 12/15/21 11:30 12/15/21 12:05Drinking Water The results in this report apply to the samples analyzed in accordance with the chain of custody document. This analytical report must be reproduced in its entirety.

Page 2 of 15 ends

EnviroMatrix Analytical, Inc.

Project Name:

Interpipe Contracting, Inc.Client Name: EMA Log #: 21L0667 Hope Elementary
Total Metals by E
PA 200 Series Methods
Analyte Result MDL Limit
Reporting
Units Dilution Batch
Sample Prepared
Sample Analyzed Method Notes Analyst
Nurses Sink (21L0667-01) Drinking Water Sampled: 12/15/21 10:59 Received: 12/15/21 12:05 2010642 01/06/22 08:38
01/11/22 12:24
mg/l 1 J0.044 0.006 0.050Zinc EPA 200.8icpms
"01/06/22 08:38
01/11/22 12:24
" ""Cadmium ND 0.0010.0002 icpms
"01/06/22 08:38
01/11/22 12:24
" ""Chromium ND 0.0500.0009 icpms
" 01/06/22 08:38
01/
11/22 12:24
" "0.234 0.002 0.050Copper "icpms
"01/06/22 08:38
01/11/22 12:24
" ""Lead ND 0.0100.0008 icpms
" 01/06/22 08:38
01/11/22 12:24
" " J0.025 0.001 0.050Nickel "icpms
"01/06/22 08:38
01/11/22 12:24
" ""Silver ND 0.0050.0006 icpms
Building A Staff Womens Bathroom (21L0667-02) Drinking Water Sampled: 12/15/21 11:19 Received: 12/15/21 12:05 2010642 01/06/22 08:38
01/11/22 12:49
mg/l 1 J0.020 0.006 0.050Zinc EPA 200.8icpms
"01/06/22 08:38
01/11/22 12:49
" ""Silver ND 0.0050.0006 icpms
"01/06/22 08:38
01/11/22 12:49
" ""Nickel ND 0.0500.001 icpms
"01/06/22 08:38
01/11/22 12:49
" ""Lead ND 0.0100.0008 icpms
" 01/06/22 08:38
01/11/22 12:49
" "0.171 0.002 0.050Copper "icpms
"01/06/22 08:38
01/11/22 12:49
" ""Cadmium ND 0.0010.0002 icpms
"01/06/22 08:38
01/11/22 12:49
" ""Chromium ND 0.0500.0009 icpms
Building C Custodial (21L0667-03) Drinking Water Sampled: 12/15/21 11:05 Received: 12/15/21 12:05 EPA 200.801/06/22 08:38
01/11/22 12:51
mg/l 20106421Lead ND 0.0100.0008 icpms
"01/06/22 08:38
01/11/22 12:51
" ""Nickel ND 0.0500.001 icpms
"01/06/22 08:38
01/11/22 12:51
" ""Silver ND 0.0050.0006 icpms
"01/06/22 08:38
01/11/22 12:51
" ""Chromium ND 0.0500.0009 icpms
The results in this report apply to the samples analyzed in accordance with the chain of custody document. This analytical report must be reproduced in its entirety.

Page 3 of 15 ends

EnviroMatrix Analytical, Inc.

Project Name:

Interpipe Contracting, Inc.Client Name: EMA Log #: 21L0667 Hope Elementary
Total Metals by E
PA 200 Series Methods
Analyte Result MDL Limit
Reporting
Units Dilution Batch
Sample Prepared
Sample Analyzed Method Notes Analyst
Building C Custodial (21L0667-03) Drinking Water Sampled: 12/15/21 11:05 Received: 12/15/21 12:05 EPA 200.801/06/22 08:38
01/11/22 12:51
mg/l 20106421Cadmium ND 0.0010.0002 icpms
" 01/06/22 08:38
01/11/22 12:51
" "0.074 0.002 0.050Copper "icpms
" 01/06/22 08:38
01/
11/22 12:51
" " J0.015 0.006 0.050Zinc "icpms
Classroom #10, Bldg. E (21L0667-04) Drinking Water Sampled: 12/15/21 11:02 Received: 12/15/21 12:05 2010642 01/06/22 08:38
01/11/22 13:03
mg/l 10.214 0.006 0.050Zinc EPA 200.8icpms
"01/06/22 08:38
01/11/22 13:03
" ""Cadmium ND 0.0010.0002 icpms
"01/06/22 08:38
01/11/22 13:03
" ""Chromium ND 0.0500.0009 icpms
" 01/06/22 08:38
01/11/22 13:03
" 21.94 0.005 0.100Copper "icpms
" 01/06/22 08:38
01/11/22 13:03
" 1 J0.002 0.0008 0.010Lead "icpms
" 01/06/22 08:38
01/11/22 13:03
" " J0.005 0.001 0.050Nickel "icpms
"01/06/22 08:38
01/11/22 13:03
" ""Silver ND 0.0050.0006 icpms
Classroom #29, Re-Locatable (21L0667-05) Drinking Water Sampled: 12/15/21 11:09 Received: 12/15/21 12:05 2010642 01/06/22 08:38
01/11/22 13:05
mg/l 10.109 0.006 0.050Zinc EPA 200.8icpms
"01/06/22 08:38
01/11/22 13:05
" ""Silver ND 0.0050.0006 icpms
" 01/06/22 08:38
01/11/22 13:05
" " J0.004 0.001 0.050Nickel "icpms
" 01/06/22 08:38
01/11/22 13:05
" " J0.002 0.0008 0.010Lead "icpms
" 01/06/22 08:38
01/11/22 13:05
" "0.225 0.002 0.050Copper "icpms
"01/06/22 08:38
01/11/22 13:05
" ""Cadmium ND 0.0010.0002 icpms
"01/06/22 08:38
01/11/22 13:05
" ""Chromium ND 0.0500.0009 icpms
Bldg. E Bathroom (21L0667-06) Drinking Water Sampled: 12/15/21 10:56 Received: 12/15/21 12:05 The results in this report apply to the samples analyzed in accordance with the chain of custody document. This analytical report must be reproduced in its entirety.

Page 4 of 15 ends

EnviroMatrix Analytical, Inc.

Project Name:

Interpipe Contracting, Inc.Client Name: EMA Log #: 21L0667 Hope Elementary
Total Metals by E
PA 200 Series Methods
Analyte Result MDL Limit
Reporting
Units Dilution Batch
Sample Prepared
Sample Analyzed Method Notes Analyst
Bldg. E Bathroom (21L0667-06) Drinking Water Sampled: 12/15/21 10:56 Received: 12/15/21 12:05 2010642 01/06/22 08:38
01/11/22 13:07
mg/l 1 J0.044 0.006 0.050Zinc EPA 200.8icpms
" 01/06/22 08:38
01/11/22 13:07
" " J0.002 0.0008 0.010Lead "icpms
"01/06/22 08:38
01/
11/22 13:07
" ""Cadmium ND 0.0010.0002 icpms
" 01/06/22 08:38
01/11/22 13:07
" "0.453 0.002 0.050Copper "icpms
" 01/06/22 08:38
01/11/22 13:07
" " J0.004 0.001 0.050Nickel "icpms
"01/06/22 08:38
01/11/22 13:07
" ""Silver ND 0.0050.0006 icpms
"01/06/22 08:38
01/11/22 13:07
" ""Chromium ND 0.0500.0009 icpms
Bldg. H Bathroom (21L0667-07) Drinking Water Sampled: 12/15/21 10:50 Received: 12/15/21 12:05 EPA 200.801/06/22 08:38
01/11/22 13:09
mg/l 20106421Chromium ND 0.0500.0009 icpms
"01/06/22 08:38
01/11/22 13:09
" ""Cadmium ND 0.0010.0002 icpms
" 01/06/22 08:38
01/11/22 13:09
" "0.329 0.002 0.050Copper "icpms
"01/06/22 08:38
01/11/22 13:09
" ""Lead ND 0.0100.0008 icpms
" 01/06/22 08:38
01/11/22 13:09
" " J0.001 0.001 0.050Nickel "icpms
"01/06/22 08:38
01/11/22 13:09
" ""Silver ND 0.0050.0006 icpms
" 01/06/22 08:38
01/11/22 13:09
" " J0.013 0.006 0.050Zinc "icpms
Bldg. J Staff Bathroom (21L0667-08) Drinking Water Sampled: 12/15/21 11:14 Received: 12/15/21 12:05 2010642 01/06/22 08:38
01/11/22 13:11
mg/l 1 J0.005 0.001 0.050Nickel EPA 200.8icpms
" 01/06/22 08:38
01/11/22 13:11
" " J0.016 0.006 0.050Zinc "icpms
"01/06/22 08:38
01/11/22 13:11
" ""Cadmium ND 0.0010.0002 icpms
"01/06/22 08:38
01/11/22 13:11
" ""Chromium ND 0.0500.0009 icpms
The results in this report apply to the samples analyzed in accordance with the chain of custody document. This analytical report must be reproduced in its entirety.

Page 5 of 15 ends

EnviroMatrix Analytical, Inc.

Project Name:

Interpipe Contracting, Inc.Client Name: EMA Log #: 21L0667 Hope Elementary
Total Metals by E
PA 200 Series Methods
Analyte Result MDL Limit
Reporting
Units Dilution Batch
Sample Prepared
Sample Analyzed Method Notes Analyst
Bldg. J Staff Bathroom (21L0667-08) Drinking Water Sampled: 12/15/21 11:14 Received: 12/15/21 12:05 2010642 01/06/22 08:38
01/11/22 13:11
mg/l 10.123 0.002 0.050Copper EP
A 200.8icpms
"01/06/22 08:38
01/11/22 13:11
" ""Silver ND 0.0050.0006 icpms
"01/06/22 08:38
01/11/22 13:11
" ""Lead ND 0.0100.0008 icpms
Bldg. J Drinking Fountain (21L0667-09) Drinking Water Sampled: 12/15/21 11:12 Received: 12/15/21 12:05 EPA 200.801/06/22 08:38
01/11/22 13:13
mg/l 20106421Nickel ND 0.0500.001 icpms
"01/06/22 08:38
01/11/22 13:13
" ""Lead ND 0.0100.0008 icpms
"01/06/22 08:38
01/11/22 13:13
" ""Zinc ND 0.0500.006 icpms
"01/06/22 08:38
01/11/22 13:13
" ""Chromium ND 0.0500.0009 icpms
"01/06/22 08:38
01/11/22 13:13
" ""Cadmium ND 0.0010.0002 icpms
" 01/06/22 08:38
01/11/22 13:13
" "0.296 0.002 0.050Copper "icpms
"01/06/22 08:38
01/11/22 13:13
" ""Silver ND 0.0050.0006 icpms
Kitchen Prep Sink (21L0667-10) Drinking Water Sampled: 12/15/21 11:16 Received: 12/15/21 12:05 EPA 200.801/06/22 08:38
01/11/22 13:15
mg/l 20106421Chromium ND 0.0500.0009 icpms
" 01/06/22 08:38
01/11/22 13:15
" " J0.007 0.001 0.050Nickel "icpms
"01/06/22 08:38
01/11/22 13:15
" ""Cadmium ND 0.0010.0002 icpms
" 01/06/22 08:38
01/11/22 13:15
" " J0.001 0.0008 0.010Lead "icpms
" 01/06/22 08:38
01/11/22 13:15
" "1.47 0.006 0.050Zinc "icpms
"01/06/22 08:38
01/11/22 13:15
" ""Silver ND 0.0050.0006 icpms
" 01/06/22 08:38
01/11/22 13:15
" 21.94 0.005 0.100Copper "icpms
Building G Bathroom (21L0667-11) Drinking Water Sampled: 12/15/21 11:30 Received: 12/15/21 12:05 2010642 01/06/22 08:38
01/11/22 13:17
mg/l 1 J0.004 0.001 0.050Nickel EPA 200.8icpms
The results in this report apply to the samples analyzed in accordance with the chain of custody document. This analytical report must be reproduced in its entirety.

Page 6 of 15 ends

EnviroMatrix Analytical, Inc.

Project Name:

Page 7 of 15 ends

EnviroMatrix Analytical, Inc.

Project Name:

Interpipe Contracting, Inc.Client Name: EMA Log #: 21L0667 Hope Elementary
Conventional Chemistry Parameters by Standard/E
PA Methods
Analyte Result MDL Limit
Reporting
Units Dilution Batch
Sample Prepared
Sample Analyzed Method Notes Analyst
Nurses Sink (21L0667-01) Drinking Water Sampled: 12/15/21 10:59 Received: 12/15/21 12:05 SM2120 B12/16/21 08:00
12/16/21 08:00
Color
Units
11216581Color ND 11 EC
SM2150 B12/16/21 08:00
12/16/21 08:00
T.O.N. 1121659"Threshold Odor Number ND 1.01.0 EC
Building A Staff Womens Bathroom (21L0667-02) Drinking
Water Sampled: 12/15/21 11:19 Received: 12/15/21 12:05 SM2120 B12/16/21 08:00
12/16/21 08:00
Color
Units
11216581Color ND 11 EC
SM2150 B12/16/21 08:00
12/16/21 08:00
T.O.N. 1121659"Threshold Odor Number ND 1.01.0 EC
Building C Custodial (21L0667-03) Drinking Water Sampled: 12/15/21 11:05 Received: 12/15/21 12:05 SM2120 B12/16/21 08:00
12/16/21 08:00
Color
Units
11216581Color ND 11 EC
SM2150 B12/16/21 08:00
12/16/21 08:00
T.O.N. 1121659"Threshold Odor Number ND 1.01.0 EC
Classroom #10, Bldg. E (21L0667-04) Drinking Water Sampled: 12/15/21 11:02 Received: 12/15/21 12:05 1121658 12/16/21 08:00
12/16/21 08:00
Color
Units
117 1 1Color SM2120 BEC
1121659 12/16/21 08:00
12/16/21 08:00
T.O.N. "4.0 1.0 1.0Threshold Odor Number SM2150 BEC
Classroom #29, Re-Locatable (21L0667-05) Drinking Water Sampled: 12/15/21 11:09 Received: 12/15/21 12:05 1121658 12/16/21 08:00
12/16/21 08:00
Color
Units
120 1 1Color SM2120 BEC
1121659 12/16/21 08:00
12/16/21 08:00
T.O.N. "4.0 1.0 1.0Threshold Odor Number SM2150 BEC
Bldg. E Bathroom (21L0667-06) Drinking Water Sampled: 12/15/21 10:56 Received: 12/15/21 12:05 1121658 12/16/21 08:00
12/16/21 08:00
Color
Units
117 1 1Color SM2120 BEC
1121659 12/16/21 08:00
12/16/21 08:00
T.O.N. "4.0 1.0 1.0Threshold Odor Number SM2150 BEC
Bldg. H Bathroom (21L0667-07) Drinking Water Sampled: 12/15/21 10:50 Received: 12/15/21 12:05 1121658 12/16/21 08:00
12/16/21 08:00
Color
Units
13 1 1Color SM2120 BEC
1121659 12/16/21 08:00
12/16/21 08:00
T.O.N. "2.0 1.0 1.0Threshold Odor Number SM2150 BEC
The results in this report apply to the samples analyzed in accordance with the chain of custody document. This analytical report must be reproduced in its entirety.

Page 8 of 15 ends

EnviroMatrix Analytical, Inc.

Project Name:

Page 9 of 15 ends

EnviroMatrix Analytical, Inc.

Project Name:

Interpipe Contracting, Inc.Client Name: EMA Log #: 21L0667 Hope Elementary
Mic
robiological Parameters by Standard Methods
Analyte Result MDL Limit
Reporting
Units Dilution Batch
Sample Prepared
Sample Analyzed Method Notes Analyst
Nurses Sink (21L0667-01) Drinking Water Sampled: 12/15/21 10:59 Received: 12/15/21 12:05 SM922312/15/21 15:28
12/16/21 15:55
None 11216451Total Coliforms Absent CC
"12/15/21 15:28
12/16/21 15:55
" ""E. Coli Absent CC
Building A Staff Womens Bathroom (21L0667-02) Drinking Wate r Sampled: 12/15/21 11:19 Received: 12/15/21 12:05 SM922312/15/21 15:28
12/16/21 15:55
None 11216451Total Coliforms Absent CC
"12/15/21 15:28
12/16/21 15:55
" ""E. Coli Absent CC
Building C Custodial (21L0667-03) Drinking Water Sampled: 12/15/21 11:05 Received: 12/15/21 12:05 SM922312/15/21 15:28
12/16/21 15:55
None 11216451Total Coliforms Absent CC
"12/15/21 15:28
12/16/21 15:55
" ""E. Coli Absent CC
Classroom #10, Bldg. E (21L0667-04) Drinking Water Sampled: 12/15/21 11:02 Received: 12/15/21 12:05 SM922312/15/21 15:28
12/16/21 15:55
None 11216451Total Coliforms Absent CC
"12/15/21 15:28
12/16/21 15:55
" ""E. Coli Absent CC
Classroom #29, Re-Locatable (21L0667-05) Drinking Water Sampled: 12/15/21 11:09 Received: 12/15/21 12:05 SM922312/15/21 15:28
12/16/21 15:55
None 11216451Total Coliforms Absent CC
"12/15/21 15:28
12/16/21 15:55
" ""E. Coli Absent CC
Bldg. E Bathroom (21L0667-06) Drinking Water Sampled: 12/15/21 10:56 Received: 12/15/21 12:05 SM922312/15/21 15:28
12/16/21 15:55
None 11216451Total Coliforms Absent CC
"12/15/21 15:28
12/16/21 15:55
" ""E. Coli Absent CC
Bldg. H Bathroom (21L0667-07) Drinking Water Sampled: 12/15/21 10:50 Received: 12/15/21 12:05 SM922312/15/21 15:28
12/16/21 15:55
None 11216451Total Coliforms Absent CC
"12/15/21 15:28
12/16/21 15:55
" ""E. Coli Absent CC
The results in this report apply to the samples analyzed in accordance with the chain of custody document. This analytical report must be reproduced in its entirety.

Page 10 of 15 ends

EnviroMatrix Analytical, Inc.

Project Name:

Page 11 of 15 ends

EnviroMatrix Analytical, Inc.

Project Name:

Interpipe Contracting, Inc.Client Name: EMA Log #: 21L0667 Hope Elementary
Result Limit
Reporting
Units Level
Spike
Result
Source
%REC
%REC
Limits RPD
RPD
Limit Notes Analyte
Total Metals by E
PA 200 Series Methods - Quality Control
MDL Analyst
Batch 2010642
Blank (2010642-BLK1) Prepared: 01/06/22 Analyzed: 01/11/22 Cadmium mg/l0.001ND 0.0002 icpms
Chromium "0.050ND 0.0009 icpms
Copper "0.050ND 0.002 icpms
Lead "0.010ND 0.0008 icpms
Nickel "0.050ND 0.001 icpms
Silver "0.005ND 0.0006 icpms
Zinc "0.050ND 0.006 icpms
LCS (2010642-BS1) Prepared: 01/06/22 Analyzed: 01/11/22 Chromium mg/l 0.100 106 85-1150.0500.106 0.0009 icpms
Zinc " 0.100 109 85-1150.0500.109 0.006 icpms
Silver " 0.100 98 85-1150.0050.098 0.0006 icpms
Nickel " 0.100 106 85-1
150.0500.106 0.001 icpms
Copper " 0.100 106 85-1150.0500.106 0.002 icpms
Cadmium " 0.100 106 85-1150.0010.106 0.0002 icpms
Lead " 0.100 101 85-1150.0100.101 0.0008 icpms
LCS Dup (2010642-BSD1) Prepared: 01/06/22 Analyzed: 01/11/22 Zinc mg/l 0.100 106 85-115 3 200.0500.106 0.006 icpms
Copper " 0.100 105 85-115 2 200.0500.105 0.002 icpms
Chromium " 0.100 104 85-115 1 200.0500.104 0.0009 icpms Lead " 0.100 100 85-115 0.8 200.0100.100 0.0008 icpms
Nickel " 0.100 104 85-115 2 200.0500.104 0.001 icpms
Silver " 0.100 98 85-115 0.3 200.0050.098 0.0006 icpms
Cadmium " 0.100 105 85-115 0.6 200.0010.105 0.0002 icpms Duplicate (2010642-DUP1) Prepared: 01/06/22 Analyzed: 01/11/22 Source: 21L0525-01 Chromium mg/l ND 200.050ND 0.0009 icpms
Copper " 0.021 6 20 J0.0500.019 0.002 icpms
Lead " ND 200.010ND 0.0008 icpms
Nickel " ND 200.050ND 0.001 icpms
Silver " ND 200.005ND 0.0006 icpms
Cadmium " 0.0003 12 20 J0.0010.0002 0.0002 icpms
Zinc " 0.007 6 20 J0.0500.008 0.006 icpms
The results in this report apply to the samples analyzed in accordance with the chain of custody document. This analytical report must be reproduced in its entirety.

Page 12 of 15 ends

EnviroMatrix Analytical, Inc.

Project Name:

Interpipe Contracting, Inc.Client Name: EMA Log #: 21L0667 Hope Elementary
Result Limit
Reporting
Units Level
Spike
Result
Source
%REC
%REC
Limits RPD
RPD
Limit Notes Analyte
Total Metals by EPA 200 Series Methods - Quality Control MDL Analyst
Batch 2010642
Matrix Spike (2010642-MS1) Prepared: 01/06/22 Analyzed: 01/11/22 Source: 21L0525-01 Chromium mg/l 0.100 ND 97 70-1300.0500.097 0.0009 icpms Silver " 0.100 ND 92 70-1300.0050.092 0.0006 icpms
Nickel " 0.100 ND 94 70-1300.0500.094 0.001 icpms
Copper " 0.100 0.021 94 70-1300.0500.114 0.002 icpms
Zinc " 0.100 0.007 98 70-1300.0500.105 0.006 icpms
Cadmium " 0.100 0.0003
99 70-1300.0010.099 0.0002 icpms
Lead " 0.100 ND 103 70-1300.0100.103 0.0008 icpms
Matrix Spike (2010642-MS2) Prepared: 01/06/22 Analyzed: 01/11/22 Source: 21L0667-01 Zinc mg/l 0.100 0.044 100 70-1300.0500.144 0.006 icpms
Cadmium " 0.100 ND 100 70-1300.0010.100 0.0002 icpms
Copper " 0.100 0.234 79 70-1300.0500.313 0.002 icpms
Chromium " 0.100 ND 98 70-1300.0500.098 0.0009 icpms
Lead " 0.100 ND 100 70-1300.0100.100 0.0008 icpms
Nickel " 0.100 0.025 95 70-1300.0500.119 0.001 icpms
Silver " 0.100 ND 93 70-1300.0050.093 0.0006 icpms
Matrix Spike Dup (2010642-MSD1) Prepared: 01/06/22 Analyzed: 01/11/22 Source: 21L0525-01 Silver mg/l 0.100 ND 92 70-130 0.1 200.0050.092 0.0006 icpms Nickel " 0.100 ND 93 70-130 1 200.0500.093 0.001 icpms
Lead " 0.100 ND 100 70-130 3 200.0100.100 0.0008 icpms
Copper " 0.100 0.021 93 70-130 0.6 200.0500.113 0.002 icpms Cadmium " 0.100 0.0003 99 70-130 0.3 200.0010.099 0.0002 icpms Zinc " 0.100 0.007 97 70-130 0.7 200.0500.104 0.006 icpms Chromium " 0.100 ND 96 70-130 0.3 200.0500.096 0.0009 icpms The results in this report apply to the samples analyzed in accordance with the chain of custody document. This analytical report must be reproduced in its entirety.

Page 13 of 15 ends

EnviroMatrix Analytical, Inc.

Project Name:

Interpipe Contracting, Inc.Client Name: EMA Log #: 21L0667 Hope Elementary
Result Limit
Reporting
Units Level
Spike
Result
Source
%REC
%REC
Limits RPD
RPD
Limit Notes Analyte
Conventional Chemistry Parameters by Standard/E
PA Methods - Quality Control
MDL Analyst
Batch 1121658
Duplicate (1121658-DUP1) Prepared & Analyzed: 12/16/21 Source: 21L0696-01 Color Color
Units
ND 201ND 1 EC
Reference (1121658-SRM1) Prepared &
Analyzed: 12/16/21
Color Color
Units

50.0 98 80-120149 1 EC
Batch 1121659
Blank (1121659-BLK1) Prepared & Analyzed: 12/16/21
Threshold Odor Number T.O.N.1.0ND 1.0 EC
Duplicate (1121659-DUP1) Prepared & Analyzed: 12/16/21 Source: 21L0696-01 Threshold Odor Number T.O.N. ND 201.0ND 1.0 EC
The results in this report apply to the samples analyzed in accordance with the chain of custody document. This analytical report must be reproduced in its entirety.

Page 14 of 15 ends

EnviroMatrix Analytical, Inc.

Project Name:

Interpipe Contracting, Inc.Client Name: EMA Log #: 21L0667 Hope Elementary
Notes and Definitions
J Detected but below the Reporting Limit; therefore, result is an estimated concentration (CLP J-Flag).

A-03 Absent
Sample results reported on a dry weight basis (if indicated in units column) Relative Percent DifferenceRPD
dry
Not ReportedNR
Analyte NOT DETECTED at or above the reporting limit (or method detection limit when specified)ND MDL Method detection limit (indicated per client's request) The results in this report apply to the samples analyzed in accordance with the chain of custody document. This analytical report must be reproduced in its entirety.

Page 15 of 15 ends

EnviroMatrix Analytical, Inc.
'l\ L ot,6 7

CHAIN-OF-CUSTODY RECORD
EMA LOG#:

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WA TER TR EA TM ENT

S E R V I C E R E P O R T
February 25, 2022 | Page 1 of 1
Jeff Modglin

YOUR CLEAR WATER TECHNOLOGIES REPRESENTATIVE
Jeff Modglin | 619.861.0900 | [email protected] 2220 Otay Lakes Road, Suite 502-107, San Diego, CA 91915

CLIENT INFO SERVICE ADDRESS SITE CONTACTS
Company: Carlsbad Unified School District
Account No.:

PO No.:

Hope Elementary School
3010 Tamarack Avenue
Carlsbad, CA 92010
system type Domestic Water
work performed Analytical Testing
Attention: Derrick Anderson
[email protected]
Copy:

INVENTORY

WATER ANALYSIS
Sample # System ID Cond pH P-ALK M-ALK CL TH PO4
1 City Water 532 8.1 0 60 60 110 0
2 Reclaimed Water 1603 7.0 0 160 180 230 5.4
3 Kitchen Prep Sink #1 562 7.9 0 70 70 140 0.3
4 Kitchen Prep Sink #2 1533 7.2 0 140 150 220 5.2
5 Boy’s Rest Room Sink 1576 7.0 0 160 160 230 5.3
6 Storage Room Sink 1537 7.1 0 140 150 230 5.2
7 Kindergarten Classroom Sink 523 8.1 0 60 60 110 0
SYSTEM STATUS | ACTIONS | RECOMMENDATIONS

1. “City Water” taken from backflow device at street.

2. “Reclaimed Water” sample taken from landscape sprinkler system. (PO4: Phosphate)

3. “Kitchen Prep Sink #1” was cold water taken immediately without running any water since yesterday afternoon.

4. “Kitchen Prep Sink #2” was cold water taken after 5-6 minutes of continuous running.

5. “Boy’s Rest Room Sink” was cold water taken after <1 minute of continuous running.

6. “Storage Room Sink” was cold water taken after <1 minute of continuous running.

7. “Kindergarten Classroom Sink” was cold water taken after 7-8 minutes of continuous running. o"i CLEAR
';,~ WATER "'~ TECHNOLOGIES"'
Incident Report – Hope Elementary School, 3010 Tamarack Ave, Carlsbad, CA 92010 Mar. 15, 2022

ATTACHMENT C
1 Jeanette Brown
Subject: FW: Hope Elementary - RW Cross Connection
From: Sterchi, Sean@Waterboards <[email protected]> Sent: Thursday, February 24, 2022 12:14 PM
To: Eric Sanders <[email protected]>
Cc: McCullough, Jamelle <[email protected]>; Ertas, Tuba@Waterboards <[email protected]>; [email protected] Subject: [External] Hope Elementary ‐ RW Cross Connection Eric,
Carlsbad MWD must take the following additional actions:

1. Submit plan for how students’ parents will be notified. If there have been any visitors to the school, a plan to notify them as well must be submitted. Submit copy of notification language to DDW for approval.

2. Submit test cert for RP device from 2/24/2022 test by COB today 2/24/2002.

3. Flushing, disinfection and bacteriological confirmation testin g of the onsite plumbing following AWWA pipeline
disinfection procedures – submit results to DEHQ and DDW

4. Submit as‐built use site plans (PW & RW properly annotated) clarifying what plumbing changes have be en made, both that resulted in the cross connection and the necessary plumbing corrections.

5. 2‐way full cross connection test must be performed (to be witnessed by DEHQ).

6. Confirm that the school will remain closed (or alternative water provided for all human consumption purposes) until DDW approves of the corrective actions taken and water quality results to reopen the school.

7. Incident report by March 4th, 2022. Include documentation for the initial shutdown testing performed when RW was activated for the use site.

Jamelle,
As discussed, please confirm DEHQ’s plan to do a press release.

Thanks
Sean
Incident Report – Hope Elementary School, 3010 Tamarack Ave, Carlsbad, CA 92010 Mar. 15, 2022

ATTACHMENT D
Technical maps have been redacted
within this attachment due to file size
Incident Report – Hope Elementary School, 3010 Tamarack Ave, Carlsbad, CA 92010 Mar. 15, 2022

ATTACHMENT E

Carlsbad Municipa l Water District - A Subs idiary District of the City of Carlsbad 5950 El Camino Real · Carlsbad CA 92008
Ph. (760) 438-2722 Email backf [email protected]
~

CARLSBAD
Acco unt Numb er: 4611900 Date of Notice : February 24, 2022 -----------
Serv ice Address: 3010 TAMARACK AV
Location: Hope Elem.-top slope front of sc

CARLSBAD UNIFIED SCHOOL
6225 EL CAMINO REAL
CARLSBAD CA 92009
Re: BACK TEST
Date Tested: 2 -J '-( -2JJ Z Z..

AWWAo~ rt.No.: S"- zzz/f
Firm Name: eiJ of: &t /2-kl
Tester Name: PM 0oH/t/SoN
Telephone No.: 7fo0 - L/36 .- 2 7 22-
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Double Check Valve Assemb ly
Check #1
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and Repa irs
Made
Tost Afte r Tight ( )
Repairs
Teste,sS;gnatu,,: w~
Interva l: 3
Make/Mode l: Wilkins 975XL2
Size: 2
Serial No.: ACB4424
Type: RP
Mtr. Size/Num.: 2 0044747269
User Code: IN
GaugeSe rialNo. //[7St"83/ot;
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Incident Report – Hope Elementary School, 3010 Tamarack Ave, Carlsbad, CA 92010 Mar. 15, 2022

ATTACHMENT F

County Of San Diego
Department of Environmental Health
Land and Water Quality Division

RECYCLED WATER SHUTDOWN TEST/COVERAGE TEST

Date
02/24/2022
ACCELA Permit No.

DEH2015-LRWS-000359
Water District
Carlsbad Municipal Water District
Start
4:10 pm
End
8:10 pm
VX Code

Project Name and Address

HOPE ELEMENTARY SCHOOL
3010 TAMARAK AVENUE
CARLSBAD, CA 92010
Recycled water use
Irrigation
Staff Present
J. McCullough & Mike Espudo
Billing party if different than water district
Same
Threshold valves used?

1. No

Test gauge locations

1. #4 test cock of RP @ water meter (4:10 pm, 22 psi)

Shutdown test description:

This cross connection inspection was required following the discovery of a cross connection at Hope Elementary School. School personnel notified the Carlsbad Municipal Water District of concerns regarding the color and odor of the water. The water district and school construction team identified a single point where the recycled water system was directly connected to the potable system. The connection was separated and this cross connection inspection was conducted to determine if that point was the only cross connection between the two systems.

The last cross connection inspection was conducted on April 5, 2017 and was witnessed by DEHQ staff. During the April 2017 inspection, no cross connections were observed or detected.

Two clocks control the irrigation system. Clock A was equipped to operate 16 stations and clock B had 11 stations. In addition, 2 valve boxes were identified on the southwest side of the property that controlled irrigation on the exterior of the school fencing (southwest portion of property). Each valve was operated for 2 minutes.

At the end of the 4 hour test the following was observed:
• Gauge pressure dropped gradually decreased from 22 psi to 10 psi. • No pressure spikes observed during the test.
• The system re-pressurized to approximately 92 psi once water was restored.

The reverse pressure differential test was conducted, taking place from February 25, 2022 – Feb 26, 2022. Pressure gauges were connected to five test points on the recycled water system, and pressure was dropped to approximately 20 psi. The potable system was in operation during this time at full pressure. The gauges were left to track for approximately 22 hours which is standard with reverse testing. No spikes in pressure were observed on the test charts submitted to DEHQ.

Unpermitted modifications to the recycled and potable system have been made to this site. Hope Elementary School shall submit as built plans of the site for review and approval by DEHQ. The Carlsbad Municipal Water District has pulled the recycled water meter for DEH2015-LRWS-000359. The recycled water meter shall not be approved for connection until all plans are approved by DEHQ, site visits are performed and a final cross connection inspection occurs where DEHQ is present.

DEH Test Recommendation/Guidance
Test pass:

Accela

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Incident Report – Hope Elementary School, 3010 Tamarack Ave, Carlsbad, CA 92010 Mar. 15, 2022

ATTACHMENT G

Date: February 24, 2022 at 6:10:41 PM PST
To: Eric Sanders <[email protected]>
Subject: Updated Message to Parents
For Hope families
Dear Hope Families,
This is a follow up to my earlier message regarding the school closure today. Hope will remain closed tomorrow, Friday, 2/25/22. We will not shift to online learning for this day.

Today, the City of Carlsbad was notified following a suspicion that the domestic water lines were crossed with reclaimed water irrigation lines on campus. Due to this suspicion, all water was immediately shut off on campus, and students were sent home.

The District had been working with its contractors to investigate reported concerns with intermittent discoloration of the water at Hope Elementary. In an abundance of caution, we made bottled water available to students and staff while we looked further into the problem.

Additional testing conducted by the City confirmed the suspicion. The City of Carlsbad is working closely with the district. We have located the problem and are repairing it immediately. Following the repair, all water lines on campus will be flushed with a high dosage of chlorinated water before restoring normal water services. The City of Carlsbad will conduct water samples and submit them to a laboratory to ensure that the water meets safe drinking standards. Multiple tests will be conducted over the weekend. We appreciate the City’s support as we work together to reopen the campus safely.

We are hopeful we will be able to resume school on Monday, 2/28/22, but need to wait until we have clearance from the City based on the laboratory tests over the weekend. I will send an additional communication no later than 7pm Sunday about the status of school on Monday.

We apologize for any inconvenience this school closure causes, however student and staff safety is always the top priority of school and district staff.

If your student experiences any stomach or intestinal illness, please consult with your physician. --
Regards,
Eric R. Dill
Assistant Superintendent, Business Services
Carlsbad Unified School District
Sent from my iPhone
Incident Report – Hope Elementary School, 3010 Tamarack Ave, Carlsbad, CA 92010 Mar. 15, 2022

ATTACHMENT H

Hope Elementary School
Carlsbad Unified School District
3010 Tamarack Ave, Carlsbad, CA92010
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ATTACHMENT G
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Incident Report – Hope Elementary School, 3010 Tamarack Ave, Carlsbad, CA 92010 Mar. 15, 2022

ATTACHMENT I

ENCINA WASTEWATER AUTHORITY
A Public Agency h200 Avenid,1 Enc ina~
Carbb ad, CA 92 011- lM'>
Telephone (760) 4J8-3LJ4 I
fAX (7b0) 4 HklH6 1 (Plant)
(760) 4J 1-7441 (Ad111in)
SAMPLE RESULTS REPORT epor a e : R t D t 2/27/2022
REPORT TO ELAP Certification No. 1441 220226001
CMWD Ref. No. EC: 2022
5950 El Camino Real
Carlsbad, CA 92008
Attention : Eric Sanders
Sample ID I Sample Point I Analyte Name
I Result I Units I
Method
Reference
AB37849 MULTIPURPOSE KITCHEN Collected : 02/26/2022 Time: 10:10 Total Residual Chlorine 2.9 mg/L SM4500 CLO
Total Coliform A bsent Present/Absent SM9223
Temperature 17 C SM2550B
E.coli A bsent Present/Absent SM9223
AB37850 CLASSROOM 27 Collected: 02/26/2022 Time: 10:21
Total Residual Chlorine 2.8 mg/L SM4500 CLO
Total Coliform Absent Present/Absent SM9223
Temperattirc 17 C SM25S0B
E.coli Absent Present/ Absent SM922 3
AB37851 CLASSROOM 26 Collected: 02/26/2022 Time: 10:26
Total Residual Chlorine 2.8 mg/L SM4500 CLO
Total Coliform Absent Present/Absent SM9223
Temperature 17 C SM25508
E.coli Abse nt Present/Absent SM9223
AB37852 CLASSROOM 36 Collected: 02/26/2022 Time: 10:32
Total Residual Chlorine 2.8 mg/L SM4500 CLO
Total Coliform Absent Present/ Absent SM9223
Temperature 17 C SM2550B
E.coli A bsent Present/Absent SM9223
AB37853 CLASSROOM 21 Collected: 02/26/2022 Time: 10:36
Total Residual Chlorine 2.9 mg/L SM4500 Cl,0
Total Coliform Absent Present/ Absent SM9223
Temperature 17 C SM2550B
E.coli Absent Present/Absent SM9223
AB378 54 CLASSROOM 34 Collected: 02/26/2022 Time: 10:41 Total Residual Chlorine 2.8 mg/L SM4500 CLO
Total Coliform A bsent Present/ Absent SM9223
Temperature 17 C SM25S0B
E.coli Absent Present/ Absent SM9223
AB37855 CLASSROOM 29 Collected : 02/26/2022 Time: 10:45 Total Residual Chlorine 2.9 mg/L SM4500 CLO
Total Colifonn A bsent Present/ Absent SM9223
Temperature 17 C SM25501:3
@ge l of 2
SERVING THE CITY OF VISTA, CITY OF CARLSBAD, BUENA SANITATION DISTJltCT, VALLECITOS WAHR DISTRICT, Plinled on LEUCADIA WASTEWATER DISTRICT AND CITY OF ENCINITAS l~C'( yt.. h1cl P◄ q 1,~1 ENCi NA WASTEWATER AUTHORITY
A Publi c Agency (,2()() Ave nicla Enci11.i~
Carlsbad, CA 920 11 - IOCJ',
Telt'phnne (760) 438-3941
FAX (7(1ll) 438-3861 (Pl.:1111)
(7blJ) 4J 1-7493 (Admin)
SAMPLE RESULTS REPORT R epor t D t 2/27/ 2022 a e:

REPORT TO ELAP Certification No. 1441 220226001
CMWD Ref. No. EC: 2022
5950 El Camino Real
Carlsbad , CA 92008
Attention: Eric Sanders
Sample ID I Sample Point I Analyte Name I Result I Units I Method
Reference
E.coli Absent Present/Absent SM9223
AB37856 CLASSROOM 10 Collecte d: 02/26/2022 T ime: 10:51 Total Residual Chlori ne 2.9 mg/L SM4500 CLO
Total Coliform Absent Present/Absent SM9223
Temperature 17 C SM2550B
E.coli Absent Present/Abse nt SM9223
AB37857 CLASSROOM 6 Collected: 02/26/2022 Time: 10:58
Total Residual Chlorine 1.44 mg/L SM4500 CLD
Total Coliform Absent Present/Ab sent SM9223
Temperature 15 C SM2550B
E.coli Absent Present/Absen t S M9223
AB37858 CLASSROOM 1 Collect ed: 02/26/2022 Time: 11:03
Tota l Residu al Chlorin e 2.9 mg/L SM4500 CLO
Total Coliform Absent Present/ Absent SM9223
Temperatur e 19 C SM2550B
E.coli Absent Present/Absent SM9223
AB37859 CLASSROOM K3 Collected: 02/26/2022 T ime: 11:09 Tota l Residual Ch lorine 2.9 mg/L SM4500 CLO
Total Coliform Absent Prese nt/ Absent SM9223
Temperature 17 C SM2550B
E.coli Absent Prese nt/Absen t SM9223
Certified By:
for
'5eff Pa-.rl<s Date:

Jeff Parks, Laboratory Manager

SERVING THE CITY OF VISTA, CITY OF CARLSBAD, BUENA SANITATION DISTRICT, VALLECITOS WATER DISTRICT,

LEUCADIA WASTEWATER OISTKICT AND CITY OF ENCINITAS
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SAMPLE RESULTS REPORT

REPORT TO
CMWD
5950 El Camino Real
Carlsbad, CA 92008
Attention : Eric Sanders
Sample ID I Sample Point I Analyte Name
AB37825 Multipurpose Kitchen
Total Residual Chlorine
Total Coliform
Temperature
E.coli
AB37826 Classroom 27
Total Residual Chlorine
Total Coliform
Temperature
E.coli
AB37827 Classroom 26
Total Residual Chlorine
Total Coliforn1
Temperatll!'e
E.coli
AB37828 Classroom 36
Total Residual Chlo1ine
Total Coliform
Temperature
E.coli
AB37829 Classroom 21
Total Residual Chlorine
Total Coliform
Temperature
E.coli
AB37830 Classroom 34
Total Residual Chlorine
Total Coliform
Temperature
E.coli
AB37831 Classroom 29
Total Residual Chlorine
Total Coliform
Temperature
R tD epo 1· ate: 2/26/2022
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ELAP Certification No. 1441 220225004
Ref. No. EC: 2022
I Result I Units
Collected: 02/25/2022

2.5 mg/L
A bsent Present/Absent
16 C
Absent Present/ Absent
Collected: 02/25/2022

2.4 mg/L
Abse nt Present/ Absent
16 C
A bsent Present/ Absent
Collected: 02/25/2022

2.7 mg/L
Absent Present/Absent
15 C
Absent Present/ Absent
Collected: 02/25/2022

2.8 mg/L
Absent Present/ Absent
15 C
Absent Present/ Absent
Collected: 02/25/2022

2.3 mg/L
A bsent Present/ Absent
16 C
Absent Present/ Abson t
Collected: 02/25/2022

2.8 mg/L
Absent Present/ Absent
15 C
Abse nt Present/Absent
Collected: 02/25/2022

2.7 mg/L
Abse nt Present/Absent
15 C
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Method
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SERVING THE CITY OF VISTA, CITY OF CARlSBAD, BUENA SANITATION DISTRICT, VAllECITOS WATER DISTRICT, LEUCADIA WASTEWATEK DISTKICT AND CITY or ENCINITAS
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SAMPLE RESULTS REPORT R eport D ate : 2/26/2022
REPORT TO ELAP Certification No. 1441 220225004
CMWD Ref. No. EC: 2022
5950 El Camino Real
Carlsbad, CA 92008
Attention : Eric Sanders
Sample ID I Sample Point I Analyte Name I Result I Units I Method
Reference
E.coli Absent Present/ A.bsen( SM9223
AB37832 Classroom 10 Collected: 02/25/2022 Time: 10:08
Total Residua l Chlorine 2.9 mg/L SM4500 CLD
Total Coliform Absent Present/Absent SM9223
Temperature 15 C SM2550B
E.coli Absent Present/Absent SM9223
AB37833 Classroom 6 Collected: 02/25/2022 Time: 10:13
Total Residual Chlorine 2.9 mg/L SM4500 CLO
Total Coliform Abse nt Present/ Absent SM9223
Temperature 16 C SM2550B
E.co li Absent Present/Abs ent SM9223
AB37834 Classroom 1 Collected: 02/25/2022 Time: 10:18
Total Residual Chlorin e 2.8 mg/L SM4500CLD
Total Coliform Absent Present/Ab sent SM9223
Temperature 15 C S M2550B
E.coli Absent Present/Ab sent SM9223
AB37835 Classroom K3 Collected: 02/25/2022 Time: 10:25
Total Residual Chlorine 2.5 mg/L SM450 0CLD
Total Coliform Abse nt Present/ Absent SM9223
Temperature 16 C SM2550B
E.coli Abse nt Present/Absent SM9223
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Certified By:]>~;~ 'Seff P,v~S Date:

Jeff Parks, Laboratory Manager

SERVING THE CITY OF VISTA, CITY OF CARLSBAD, BUENA SANITATION DISTRICT, VAU ECITOS WATER DISTRICT, LEUCADIA WASTEWATER DISTRICT AND CITY Of ENCINITAS
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Incident Report – Hope Elementary School, 3010 Tamarack Ave, Carlsbad, CA 92010 Mar. 15, 2022

ATTACHMENT J

1 Jeanette Brown
Subject: FW: Hope School
Attachments: Special 2-26-2022.pdf; Hope Elementary Potable.pdf; Hope School Recycled charts.pdf; Scan_.pdf; 3010 Tamarack Av - ACB4424 - 2-24-2022.pdf; DEH2015-LRWS-000359 02.24.22.pdf; SPECIAL 2-25-2022.pdf
From: Sterchi, Sean@Waterboards <[email protected]> Sent: Sunday, February 27, 2022 1:26 PM
To: Eric Sanders <[email protected]>
Cc: McCarthy, Sean@Waterboards <[email protected]>; Souza, Kurt@Waterboards <[email protected]>; Polhemus, Darrin@Waterboards <[email protected]>; Robertson, Blair@Waterboards <[email protected]>; Ertas, Tuba@Waterboards <[email protected]>; McCullough, Jamelle <[email protected]>; Buonomo, Heather <[email protected]>; Kameisha Nichols ([email protected]) <[email protected]>; Ryan Johnson, DEH Food & Housing Division <[email protected]>; [email protected]; Mello, Vanessa <[email protected]>; Vicki Quiram <[email protected]> Subject: RE: 2‐26‐2022 Report CMWD
Eric,
I understand the following:

1. Carlsbad MWD and Hope Elementary have disconnected the cross connection that was discovered last week.

2. The use site’s PW meter is protected by an RP device, which was retested by the day of the cross connection discovery. Test cert is attached. The site is served by only 1 RW meter and only 1 PW meter.

3. A 2‐way shutdown test has been per
formed with DEHQ oversight (reports and DEHQ test report attached).

4. The RW meter has been removed and the irrigation system served by RW is currently dry. CMWD will require Hope Elementary to submit RW use site plans and receive CMWD, DEHQ and DDW approval prior to restoring RW service to the use site. In addition, if the ex isting RW system is to be highlined in
the interim, CMWD will require the highline to be protected by an RP device and that device will be tested after installation and must re
ceive a passing test.

5. The onsite potable water plumbing has been disinfected, flushed and tested per AWWA C651‐14.

Two sets of bacti’s were collected 2/25 and 2/26 from 11 sites, covering the majority of all buildings on the campus. Both reports and the sample siting plan are attached. The results are acceptable.

Based on the actions taken by CMWD and acceptable bacti results, CMWD may li ft the water quality
advisory. Great job to you and the CMWD staff for the swift and effective response. As previously discussed, please submit the incident report no la
ter than 3/4/2022.

Thanks
Sean
Incident Report – Hope Elementary School, 3010 Tamarack Ave, Carlsbad, CA 92010 Mar. 15, 2022

ATTACHMENT K

From: Eric Dill <[email protected]>
Date: February 27, 2022 at 4:03:13 PM PST
To: Eric Sanders; Vicki Quiram
< Subject: Message for Hope Elementary Parents
Dear Vicky and Eric--
The message below was just sent to Hope families. I really appreciate all your help these last few days. Thank you very much. Please let me know if you need anything else.

Dear Hope Elementary Families,

District staff shared the following message with me a few minutes ago:

Hope Elementary School is cleared to reopen tomorrow, Monday morning, at its usual start time.

The City of Carlsbad has given the clearance to reopen, after treating the school’s plumbing and conducting water quality tests on Friday and Saturday which were analyzed by a third-party laboratory.

After the cross-connection was removed, the City purged the plumbing system throughout the school with highly chlorinated water, and then allowed the chlorinated water to sit overnight. On Friday, City crews then flushed out the chlorinated water with potable water. The water tests were conducted after this process was completed. We are grateful for the City’s assistance in helping us resolve this problem.

Additionally, we replaced all of the drinking water dispenser filters on campus.

While we are still investigating how this happened, it appears to us that the water lines were crossed during construction before the campus reopened in August. The water had been tested by the contractor using a standard test for safety to check for e. Coli and other bacterias before the school reopened, with negative results; but the tests did not detect the cross- connection. Subsequent tests by our contractors used the same method, with the same results.

As mentioned last week, the state water authorities recommend that if your child has any symptoms of stomach or intestinal illness, please consult with your physician.

We’re sorry that this situation occurred, and regret the concern, inconvenience, and frustration for our students, families, teachers and staff.

I look forward to welcoming our Hawks back to campus tomorrow, Monday, 2/28/22.

Sincerely,
Ashley Rossiter, Principal
--
Regards,

Eric R. Dill
Assistant Superintendent, Business Services
Carlsbad Unified School District
Incident Report – Hope Elementary School, 3010 Tamarack Ave, Carlsbad, CA 92010 Mar. 15, 2022

ATTACHMENT L

Hope Elementary School Water Issue
Frequently Asked Questions
2/28/2022
On Thursday, February 24, the City of Carlsbad was notified following a suspicion that the domestic water lines at Hope Elementary were crossed with reclaimed water irrigation lines on campus. Due to this suspicion, all water was immediately shut off on campus, and students were sent home.

The District had been working with its contractors to investigate reported concerns with intermittent discoloration of the water at Hope Elementary. Water samples were taken throughout the campus and tested for safety. No pathogens (such as e.coli) were found in the samples, and the water was found to be within safe drinking standards. In an abundance of caution, we made bottled water available to students and staff while we looked further into the problem.

Additional testing conducted by the City confirmed the suspicion. The City of Carlsbad worked closely with the district to locate the problem and repair it immediately.

The City of Carlsbad gave the clearance to reopen on Monday, February 28, after treating the school’s plumbing and conducting water quality tests, which were analyzed by a third-party laboratory for safety.

After the cross connection was removed, the City purged the plumbing system throughout the school with highly chlorinated water, and then allowed the chlorinated water to sit overnight. On Friday, City crews then flushed out the chlorinated water with potable water. The water tests were conducted after this process was completed. We are grateful for the City’s assistance in helping us resolve this problem.

Additionally, we replaced all of the drinking water dispenser filters on campus.

Frequently Asked Questions
How did the cross connection occur?
We are still investigating how this occurred. It appears that this happened during the course of construction based on the timing of complaints and the location of the cross connection.

When did the complaints begin?
Shortly after the school reopened in the fall, there were sporadic reports of water discoloration in limited locations; the construction teams indicated that the issue was aesthetic and would resolve upon flushing the system.

We received additional complaints about intermittent problems with the water color, taste, and smell in November 2021. An investigation was conducted with testing results described below that did not indicate the water was unsafe.

Following additional complaints after winter break, more tests were performed and the District hired an independent consultant to look deeper into the cause of the recurring problem.

Carlsbad Unified School District, 2/28/2022 Page 1 of 3 How did the District respond?
The District notified its contractors of the problem and brought them onsite to diagnose the issue. Initially it was believed that the source was contamination that was introduced during construction or other disturbance in the infrastructure which would resolve with flushing the plumbing lines. The water testing described below was performed to rule out harmful bacteria, but testing was not ordered that would have detected the higher levels of chlorine, water hardness, and alkaline content that is found in reclaimed water.

The testing information we received concerning the safety of the water was shared with the principal, and she was relying on the same information provided to the District.

As complaints persisted, the contractors were brought out again and eventually the District hired an independent consultant to conduct additional testing to determine the problem.

Was the water tested?
Yes. Testing was performed by the plumbing contractor. The water was tested twice before the school reopened–once before opening the new kindergarten classroom that was being temporarily used as an administration office, and once before the entire school was reopened.

The water was tested for e.coli and other coliforms which would indicate harmful bacteria in the water.

Reclaimed water is disinfected, which is why the tests did not detect those substances.

Following school opening, tests were again conducted by the contractor while the problem was being investigated. Again, no e.coli or other coliforms were detected.

Following the test in January, the District hired an independent consultant to determine the cause of the ongoing complaints. The increased levels of chlorine, water hardness, and alkaline content indicated the cross connection.

Test results:

April 2,2021
August 13, 2021
November 10, 2021
January 11, 2022
February 24, 2022
Was the problem school wide or confined to specific locations? The plumbing system on the campus was being served by both potable water and water from the cross connection. The contaminated water mixed with the potable within the plumbing lines.

What contaminants might students have been exposed to?
Reclaimed water is highly treated and disinfected, but still contains higher levels of salts, dissolved minerals, nitrogen, and phosphorus than drinking water. The EPA has stringent guidelines to keep biological contaminants to a safe minimum.

Do students need to be tested by their doctor?
The State Water Resources Control Board advises parents to seek medical attention if your child exhibits symptoms of stomach or intestinal illness.

Carlsbad Unified School District, 2/28/2022 Page 2 of 3 What was done to restore drinking water to the school?
All water to the school was turned off while we located the cross connection on Thursday. February 24. Once the connection was found, it was removed and a new connection was made to the potable water.

City of Carlsbad crews then purged the plumbing system with heavily chlorinated water on Thursday night.

That water remained in the system overnight and was then flushed out on Friday. Following the flushing process, the City conducted its own water sampling on Friday (February 25) and Saturday (February 26). The County of San Diego reviewed the test results and gave clearance for the school to reopen on Monday (February 28).

Is this a problem at other schools that had recent construction? We have not had any reports, but will work with the City of Carlsbad to conduct cross connection testing at Kelly and Magnolia as a precaution.

Why didn’t the District notify parents of the complaints? We are sincerely sorry that this was not reported earlier. We relied on the reports and information from our contractors, construction and bond program managers that the water had been tested for safety, that the issue was aesthetic, and would resolve. We did not anticipate the cause of the problem, and we regret that we did not discover the cause sooner. Once we were alerted to the cause, we took all the steps necessary to prevent further exposure; to inform our community; and to resolve the problem.

Carlsbad Unified School District, 2/28/2022 Page 3 of 3 Incident Report – Hope Elementary School, 3010 Tamarack Ave, Carlsbad, CA 92010 Mar. 15, 2022

ATTACHMENT M
Photos and technical maps have
been redacted within this
attachment due to file size
From: Michael Espudo
To: Andrew Wilson
Subject: FW: Hope ES Drinking Fountain Water Supply
Date: Monday, February 28, 2022 1:29:22 PM
Attachments: Drinking Fontain Supply 01.jpeg
Drinking Fontain Supply 02.jpeg
C005-SITE-UTILITIES-PLAN-Rev.0 Redline.pdf
Demoed Restroom Water Supply.jpeg
From: Andy Teclaw <[email protected]>
Sent: Monday, August 17, 2020 12:17 PM
To: Michael Espudo <[email protected]>
Cc: Tyler Ennis <[email protected]>; Adam Weisberg <[email protected]> Subject: Hope ES Drinking Fountain Water Supply
Mike,
Attached are photos & plans showing work @ drinking fountain @ playground and Demoed Restroom Water Supply. This is the water supplies that have been disconnected at this time. If you review the attached plans, the domestic water lines that are to be tied into are well away from the reclaimed water supply lines.

CAUTION: Do not open attachments or click on links unless you recognize the sender and know the content is safe.

Incident Report – Hope Elementary School, 3010 Tamarack Ave, Carlsbad, CA 92010 Mar. 15, 2022

ATTACHMENT N

From: Michael Espudo
To: [email protected]
Cc: [email protected]; Eric Sanders; Andrew Wilson Subject: Hope Elementary Temporary Irrigation High-Line.

Date: Friday, August 28, 2020 10:27:08 AM
Good morning Andy,
Per my site visit on Thursday August 13, 2020, I had a conversation with you and Dereck about the recycled irrigation and my concerns with the changes being made.

I suggested to Derek, It would be in the best interest of the City of Carlsbad Municipal Water Department and CUSD that we high-line Hope Elementary off the old existing potable irrigation service temporarily until the completion of Hope Elementary's renovations, at which time we will conduct a full cross connection on entire site with DEH over-site on approved recycled irrigation plans, Derek is in agreement.

The next step would be getting your temporary water meter, which can be done by contacting Engineering and Land Development at (760) 602-2750
. There is $900 (refundable) deposit
and a $192 (non-refundable) rental charge for the meter.

Contact me if you have any questions, (760)802-7768.

Thanks,
Michael Espudo
Cross Connection Specialist
City of Carlsbad
Sent from my iPad

ATTACHMENT B
April 22, 2022
Mr. Sean Sterchi, PE
San Diego District Engineer
State Water Resources Control Board
Division of Drinking Water
1350 Front Street, Room 2050
San Diego, CA 92101
Ccarlsbad
Municipal Water District
Sent via email: [email protected]
RE: Responses to questions regarding the Recycled Water Cross Connection Incident Report for Hope Elementary School
Dear Mr. Sterchi:

The Carlsbad Municipal Water District (CMWD) is pleased to submit responses to the follow-up questions we received on April 7, 2022. These responses relate to the Recycled Wat.er (RW) Cross-Connection Incident Report for Hope Elementary School, Carlsbad Unified School District, (CUSD), dated March 15, 2022. Responses to Questions 2, 5 and 6 are grouped together at the end of this letter. Throughout CMWD' s responses, the City of Carlsbad is abbreviated as "the city" and Hope Elementary School as "Hope School."
Question 1: Please provide exact date of the initial cross connection test performed in 2017.

Response: The initial cross connection test was performed on April 5, 2017 (Attachment 1).

Question 2: Provide an explanation as to why the subsequent quadrennial shutdown test was not performed in 2021.

Response: Responses to Questions 2, 5 and 6 are grouped together at the end of this letter.

Question 3: Provide a copy of the RW use site user agreement or permit for Hope School.

Response: See Recycled Water Use Site Certification, LRWS 2015-359 (Attachment 2).

Question 4: Provide a copy of CMWD Rules & Regs for RW Use, besides city Ordinance #43 or #45 (some potentially relevant sections are copied below).

Response: A copy is provided in Attachment 3.

Question 5: I understand CMWD was aware of a construction project that involved plumbing changes and requested a plan submittal. However, the school apparently refused to comply.

Please provide an explanation as to why CMWD did not cease deliveries of RW to the use site Carlsbad Municipal Water District
5950 El Camino Real I Carlsbad, CA 92008 I 442-339 -2722 I www.carlsbadca .gov Responses to the SWRCB questions
April 22, 2022

Page 2 ends

for noncompliance with the city's rules and regulations for the use of RW. Enforcement authority to do so appears to be in Ordinance #45, Section 4, fi rst paragraph (copied below).

Response: Responses to Questions 2, 5 and 6 are grouped together at the end of this letter.

Question 6: Please provide an explanation of why the 2020 and 2021 inspections, as required by the County of San Diego Department of Environmental Health and Quality/CMWD (option 1, condition #5), were not scheduled with DEHQ or completed.

Response: Responses to Questions 2, 5 and 6 are grouped together at the end of th is letter.

Question 7: Provide make/model/serial number/latest test cert for the backflow device that is serving the temporary RW irrigation system highline (mentioned in 3.22.6?).

Response: There is no active irrigation water source connected on site, potable or recycled.

CUSD has not submitted any plans or followed any of the steps described in the March 10, 2022, email from CMWD Utilities Supervisor Andrew Wilson to CUSD Construction Manager Derrick Anderson (Attachment 4) that would allow CMWD to provide a temporary highline.

Question 8: Provide letter/correspondence to Hope that includes the direction/requ irements summarized in the incident report, e.g., 3.21 through 3.23.2, etc.

Response: Please refer to the March 10, 2022, email from CMWD Utilities Supervisor Andrew Wilson to CUSD Construction Manager Derrick Anderson (Attachment 4).

Question 9: Explain why the school wasn't high lined with potable water as Derek apparently agreed to in Attachment N email.

Response: Neither Mr. Anderson nor CUSD's contractor submitted an application for a temporary meter to the city's Land Development Engineering Division (LDE) for a highline.

An application for a temporary meter is needed before a potable highline may be installed.

After receiving a follow-up email from CMWD senior cross-control technician Michael Espudo in October 2020, Tyler Ennis of Erickson Hall Construction Company (Erickson Hall) emailed LDE requesting a temporary water meter and was informed of the need to complete an E-27 application for this meter (Attachment 5). The city never received an E-27 application from Erickson Hall. While awaiting the application's submittal, LDE and CMWD staff discussed the matter and noted (1) the site was subject to the July 30, 2020, Stop Work Order, (2) the plans CUSD submitted that were approved by the Division of the State Architect (DSA), and the accompanying photos that showed the progress of construction, did not depict any work to the recycled water irrigation system, and (3) the plans supported the Aug. 17, 2020, email from Andrew Teclaw of Erickson Hall represent ing that no work would occur on the recycled water irrigation system and the potable water work was well away from the irrigation system (Attachment 6).

Responses to the SWRCB questions
April 22, 2022

Page 3 ends

Question 10: Add information on when the school was open, both to kids and staff, since the cross connection was made (around the time of painting the plumbing).

Response: The first day of school was Aug. 24, 2020. The city and CMWQ do not know the date that staff returned to school.

Question 11: Please provide a list of schools within the city's service area that use RW and the last shutdown test dates. If known, include whether or not any construction has taken place since the last shutdown test.

Response: Schools within CMWD's service area with recycled water irrigation, and corresponding last shutdown test dates, are listed in Attachment 7. Except for Hope School, CMWD is not aware of any construction activity at these schools.

Question 2: Provide an explanation as to why the subsequent quadrennial shutdown test was not performed in 2021.

See below for response.

Question 5: I understand CMWD was aware of a construction project that involved plumbing changes and requested a plan submittal. However, the school apparently refused to comply.

Please provide an explanation as to why CMWD did not cease deliveries of RW to the use site for noncompliance with the city's rules and regulations for the use of RW. Enforcement authority to do so appears to be in Ordinance #45, Section 4, first paragraph (copied below).

See below for response.

Responses to Questions 2, 5, and 6 are provided in narrative fashion below:

CMWD schedules annual inspections and quadrennial shutdown tests with County DEHQ staff for recycled water users. Inspections and tests at schools are scheduled in the summer months when children are not in school and educational activities will not be affected by the inspections or water shutdowns.

The CUSD construction project to remodel Hope School began in the summer of 2020. On Aug. 13, 2020, in preparation for scheduling an annual use site inspection, CMWD cross connection specialist Michael Espudo visited Hope School. Upon arrival, Mr. Espudo noticed construction activity. Mr. Espudo was not aware of any planned changes to the school's private irrigation system. Having noticed this construction activity, Mr. Espudo asked to speak with the on-site construction superintendent and was presented to Mr. Teclaw of Erickson Hall. Mr. Espudo voiced his concerns to Mr. Teclaw about this construction and its potential to modify the private, recycled water irrigation system without CUSD submittal of plans or approval from DEHQ.

Responses to the SWRCB questions
April 22, 2022
Page4
Thereafter, CUSD's Derrick Anderson, joined the conversation. Mr. Espudo reiterated his concerns to Mr. Anderson and told him that CUSD needed to refrain from working on irrigation lines unt il plans for any changes to the irrigat ion system were approved. Mr.

Anderson stated CMWD had no jurisdiction at Hope School and that CUSD would continue with all its construction work.

On Aug. 17, 2020, Mr. Teclaw sent an email to Mr. Espudo stating that no construction was occurring or planned near the recycled water irrigation system (Attachment 6). In the email, Mr. Teclaw conveyed:
"Attached are photos & plans showing work@ drinking fountain @ playground and Demoed Restroom Water Supply. This is the water supplies that have been disconnected at this time. If you review the attached plans, the domestic water lines that are to be tied into are well away from the reclaimed water supply lines." The email included three photos of work on the private potable water system for a drinking water fountain and restroom supply. The email also included a DSA-approved Utilities Plan that showed this potable water work but did not show any work planned on or near the recycled irr igation system. The Utilities Plan did not show the relocatable buildings, or the area along the west property fence behind these buildings, where CMWD and CUSD's contractor found and corrected the cross connection on Feb. 24, 2022, after CUSD's report of a water quality issue at Hope School.

Regarding Question 5, as noted in your letter, CMWD Ordinance 45, Article II, Section 4 states that recycled water will be shut-off on failure to comply with the CMWD rules and regulations. CMWD Ordinance 45, Article II, Section 9 additionally authorizes, but does not require, the Executive Manager of CMWD to discontinue recycled water service if: (1) employees of the city or CMWD are refused admittance to any premises supplied with recycled water; (2) employees of the city or CMWD are hindered or prevented from making an inspection of a recycled water site; (3) a vicious dog or animal exists on a premises supplied with recycled water; or (4) for any other reason.

CMWD did not shut-off Hope School's recycled water because the CUSD submitted DSA approved plans and photos supporting Mr. Teclaw's statement that no work would occur on or near the recycled water irrigation system.

CMWD Ordinance 45, Article IX, Section 9 fu rther provides that CMWD shall begin a process to terminate water service when encountering water uses that represent a clear and immed iate hazard to the potable water supply that cannot be immediately abated . Before Feb. 24, 2022, CMWD's understanding of the construction activity at Hope School did not present a clear and immediate hazard to either CMWD's or CUSD's potable water supply.

Regarding questions 2 and 6, because of the ongoing work on the school's private potable water system on private property, staff determined it effective to wait until the work on the private water system was completed to conduct the annual inspection and quadrennial test.

Responses to the SWRCB questions
April 22, 2022

Page 5 ends

Please feel free to contact me with any further questions at 760-443-8879 or by email at [email protected] .

Sincerely,
M~-/'&luv)~
Vicki Quiram
General Manager
cc: Scott Chadwick, Executive Manager
Geoff Patnoe, Assistant Executive Manager
Celia Brewer, General Counsel
Paz Gomez, Deputy City Manager, Public Works
Robby Contreras, Assistant General Counsel
Dave Padilla, District Engineer
Eric Sanders, Utilities Manager
Responses to the SWRCB regarding the Incident Report – Hope Elementary School, 3010 Tamarack Ave, Carlsbad, CA 92010 April 22, 2022 ATTACHMENT 1
ij_ S"•-- * !low .Qpen.. 1B f wporl G\ U~oom · '- r ll. :~ ? tldp Table Graph !
'1!~ 20 H 12:49, S 3.3
Hose Bib, K inder garten Area, Potabl e W ater
(PR3 00 ) -Pressure/psig
90 k
1 -
80 70
-60
-
-
-50 --
--40
f-
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30 ---f-
20 -f-
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--------
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-----
10AM 11AM
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I
5 ATTACHMENT 2
Responses to the SWRCB regarding the Incident Report – Hope Elementary School, 3010 Tamarack Ave, Carlsbad, CA 92010 April 22, 2022

ELISE ROTHSCHILD

DIRECTOR
April 7, 2017
Ela Karczewski

DEPARTMENT OF ENVIRONMENTAL HEAL TH

LAND AND WATER QUALITY DIVISION
P.O. BOX 129261, SAN DIEGO, CA 92112-9261
Phone: (858) 505-6700 or (800) 253-9933 Fax: (858) 505-6786 www.sdcdeh.org
Carlsbad Municipal Water District
1635 Faraday Ave.

Carlsbad, CA 92008
Dear Ms. Karczewski:

AMY HARBERT

ASSISTANT DIRECTOR
RECYCllED WATER lJJSIE srne CIERTlf !CATmN : HOIPIE IElEMIEINTARY SCHOOl - lRWS 20!15~ 359
. The recycled water cross-connection control shutdown test and/or use site inspection for the use site located at the address in the subject line has been successfully completed. No discoverable cross connections between the use site potable water systems and the use site recycled water systems were discovered at the time and date of the inspection. The overspray, ponding and signage inspection was successfully completed.

This use site is approved for the use of recycled water.

If you have any questions, please feel free to contact me at (619) 607-8351.

Sincerely,
1~~
GLENN LEEKS, Environmental Health Specialist Ill
Cross-Connection Control/Recycled Water
cc: Sean Sterchi, P.E., District Engineer, State Health, 1350 Front St., Room 2050', San Diego, CA 92101 . .
"Environmental and public health through leadership, partnership and science" ATTACHMENT 3
Responses to the SWRCB regarding the Incident Report – Hope Elementary School, 3010 Tamarack Ave, Carlsbad, CA 92010 April 22, 2022 { Carlsbad
Munic ipal Water District

RECYCLED WATER USE RULES AND REGULATIONS
The following guidelines have been established by the City of Carlsbad in conjunction with the San Diego County Department of Environmental Health . As Use Site Supervisor, we depend on you to ensure the safe use of recycled water by operating your system in compliance with these guidelines:

1. You are responsible for the recycled water system at the site. Recycled water irrigation systems are to be operated between the hours of 10:00 p.m. and 6:00 a.m. ONLY. Any recycled water irrigation operated outside this timeframe must be done manually with qualified supervisory personnel on site . Recycled water irrigation systems shall not be left unattended while operating outside the normal schedule at any time.

2. You are responsible for the operation and maintenance of your recycled water irrigation system and prevention of any potential violations on the recycled water system . Perform routine checks for broken irrigation heads , irrigation heads out of adjustment , leaks , broken lines, missing purple caps and faded stickers . Ensure that adjacent properties do not install potable irrigation into your recycled water irrigation area or connect potable water irrigation to your recycled water irrigation.

3. Irrigate in a manner that will minimize runoff, pooling and ponding . The application rate shall not exceed the infiltration rate of the soil. Irrigation must be compatible with the lowest soil infiltration rate present. One way to accomplish this is to use the repeat function on the irrigation controller to break up the total irrigation time into cycles that will promote maximum soil absorption. Another way is to select proper irrigation heads for each situation.

4. Ensure that there are no unauthorized discharges of recycled water at your site. An unauthorized discharge is any amount of recycled water that leaves the designated use site.

5. Educate all landscape and maintenance personnel on a continuous basis about the presence of recycled water. Personnel must be informed that recycled water is meant for irrigation purposes only and is not approved for drinking purposes, hand washing , cleaning of tools, etc. Due to the high turnover rate of employees in the landscaping industry , it is important this information be disseminated on an almost daily basis. As Use Site Supervisor, you are responsible for educating your employees, other contractors (window washers, for example)

6. Obtain prior approval of all proposed changes and modifications to your irrigation systems . Submit any changes for review and approval to the City of Carlsbad Engineering Office. If you have any questions about City of Carlsbad Design Standards, contact the Engineering Office at (760) 602-2740.

7. An annual walk-through inspection will be conducted by City of Carlsbad Cross Connection Control Staff.

You will receive a pre-inspection form to help you conduct a preliminary walk-through and identify corrections needed .

When the corrections are complete, contact City of Carlsbad Cross Connection Control staff at (760) 438-2722 to schedule the required annual walk-through inspection .
-jJ 8. An on-site user supervisor shall be designated in writing. This individual shall be familiar with plumbing systems within the property, with the basic concepts of backflow/cross connection protection, and the specific requirements of a recycled water system . Copies of this designation, with contact phone numbers shall be provided to the San Diego Department of Environmental Health and the Carlsbad Municipal Water District.

9. All above grade piping must be marked purple and all signage must be in place .

Failure to comply with any or all of the above guidelines puts your system in violation of the District's Rules & Regulations, and will result in termination of service until the appropriate corrective steps have been taken .

Recycled water service may be terminated whenever the quality of the recycled water does not comply with the requirements of the regulatory agencies or at any time these Rules & Regulations for Recycled Water Service are violated .

City of Carlsbad / Carlsbad Municipal Water Distric;t
5950 El Camino Real I Carlsbad, CA 92008 I 760-438-2722 I backflow @carlsbadca.gov ATTACHMENT 4
Responses to the SWRCB regarding the Incident Report – Hope Elementary School, 3010 Tamarack Ave, Carlsbad, CA 92010 April 22, 2022 From: Andrew Wilson
To: Derrick Anderson
Cc: Vicki Quiram; [email protected]; Dave Padilla; Michael Espudo Subject: Updated Steps To Get Irrigation Restored at Hope Elementary Date: Thursday, March 10, 2022 2:26:00 PM
Attachments: Steps To Get Irrigation Restored To Hope School 3-10-22.docx image002.jpg
Derrick,

I
have attached the updated to-do list for CUSD to get irrigation restored using potable water.

Please call me if you have any further questions.

Kind
Regards,

Andrew
Wilson
Utilities Supervisor
Water Operations

Carlsbad MWD

C:
760-802-5720 | [email protected]

RI
Steps To Get Irrigation Restored To Hope School

1. Contractor under the direction of CUSD staff, to excavate areas identified by CMWD and DEHQ staff to verify line cross connected with irrigation system is fully abandoned at the point of connection(s).

2. CUSD will submit current irrigation plans of the entire school site, along with E-27 water meter permit application to LDE. These plans shall include current irrigation alterations and potable high line plans.

3. Once routed to CMWD via Land Development and Engineering Department, plans shall be approved by CMWD Cross Connection staff, District Engineer, and SDCDEHQ.

4. In this particular case, it has already been communicated to CUSD staff by CMWD staff, that the old potable irrigation service still on site will be utilized as the feed for the temporary potable high line to irrigation system.

5. CUSD shall instruct contractor to expose all piping around the current recycled meter box and the old potable irrigation meter box, including the two inch backflow still on site.

6. This two inch backflow on the old potable irrigation line MUST be tested and pass in order for a meter to be issued. If the backflow does NOT pass a new device may be installed.

7. After the connection between irrigation line and old potable irrigation line after backflow is made and observed with DEHQ and CMWD cross connection oversite, potable water can be introduced to the site utilizing this connection.

8. CMWD along with SDCDEHQ oversite will then schedule and perform a cross connection test for the site.

9. After a successful completion of cross connection test, a recycled meter can be issued and installed on site, and CUSD can disconnect their temporary potable feed with CMWD oversite, and reconnect recycled meter into existing irrigation.

ATTACHMENT 5
Responses to the SWRCB regarding the Incident Report – Hope Elementary School, 3010 Tamarack Ave, Carlsbad, CA 92010 April 22, 2022 From: Michael Espudo
To: Andrew Wilson
Subject: FW: Hope Elementary Temporary Irrigation High-Line.

Date: Monday, February 28, 2022 10:09:48 AM
Attachments: image001.png
From: Michael Espudo
Sent: Monday, October 19, 2020 9:23 AM
To: Tyler Ennis <[email protected]>
Subject: RE: Hope Elementary Temporary Irrigation High-Line.

Thank you.

From: Tyler Ennis <[email protected]>
Sent: Monday, October 19, 2020 9:16 AM
To: Michael Espudo <[email protected]>
Subject: RE: Hope Elementary Temporary Irrigation High-Line. 10-4. Will do.

From: Michael Espudo <[email protected]>
Sent: Monday, October 19, 2020 9:17 AM
To: Tyler Ennis <[email protected]>
Subject: RE: Hope Elementary Temporary Irrigation High-Line.

Ok thanks sounds good, please keep me posted so I can observe the high-line installed.

From: Tyler Ennis <[email protected]>
Sent: Monday, October 19, 2020 8:59 AM
To: Michael Espudo <[email protected]>
Cc: Adam Weisberg <[email protected]>
Subject: RE: Hope Elementary Temporary Irrigation High-Line.

Hi Michael,
I heard back from the District and they directed Erickson-Hall to pull the water meter permit. So I called Land Development and spoke with Linda who is now going to talk with her bosses. I will start filling out the E-27 Application Water Meter Permit.

Thank you,
Tyler Ennis

From: Michael Espudo <[email protected]>
Sent: Thursday, October 15, 2020 3:41 PM
To: Tyler Ennis <[email protected]>
Subject: FW: Hope Elementary Temporary Irrigation High-Line.

Tyler,

Here
is a copy of the email I sent.

Thanks,

Michael
Espudo
City of Carlsbad
Cross Connection Control Technician
Office (760)438-2722 Ext. 7131
Cell (760)802-7768

From:

Michael Espudo
Sent: Friday, August 28, 2020 10:27 AM
To: [email protected]
Cc: [email protected]; Eric Sanders <[email protected]>; Andrew Wilson <[email protected]>
Subject: Hope Elementary Temporary Irrigation High-Line.

Good morning Andy,
Per my site visit on Thursday August 13, 2020, I had a conversation with you and Derrick about the recycled irrigation and my concerns with the changes being made.

I suggested to Derrick, It would be in the best interest of the City of Carlsbad Municipal Water Department and CUSD that we high-line Hope Elementary off the old existing potable irrigation service temporarily until the completion of Hope Elementary's renovations, at which time we will conduct a full cross connection test on entire site with DEH over-site on approved recycled irrigation plans, Derek is in agreement.

The next step would be getting your temporary water meter, which can be done by contacting Engineering and Land Development at (760) 602-2750. There is $900 (refundable) deposit and a $192 (non-refundable) rental charge for the meter.

Contact me if you have any questions, (760)802-7768.

Thanks,
Michael Espudo
Cross Connection Specialist
City of Carlsbad
Sent from my iPad
CAUTION: Do not open attachments or click on links unless you recognize the sender and know the content is safe.

CAUTION: Do not open attachments or click on links unless you recognize the sender and know the content is safe.

ATTACHMENT 6
Responses to the SWRCB regarding the Incident Report – Hope Elementary School, 3010 Tamarack Ave, Carlsbad, CA 92010 April 22, 2022 Photos and technical map have been
redacted within this attachment due to
file size
From: Michael Espudo
To: Andrew Wilson
Subject: FW: Hope ES Drinking Fountain Water Supply
Date: Monday, February 28, 2022 1:29:22 PM
Attachments: Drinking Fontain Supply 01.jpeg
Drinking Fontain Supply 02.jpeg
C005-SITE-UTILITIES-PLAN-Rev.0 Redline.pdf
Demoed Restroom Water Supply.jpeg

From: Andy Teclaw <[email protected]>
Sent: Monday, August 17, 2020 12:17 PM
To: Michael Espudo <[email protected]>
Cc: Tyler Ennis <[email protected]>; Adam Weisberg <[email protected]> Subject: Hope ES Drinking Fountain Water Supply

Mike,
Attached
are photos & plans showing work @ drinking fountain @ playground and Demoed Restroom Water Supply. This is the water supplies that have been disconnected at this time. If you review the attached plans, the domestic water lines that are to be tied into are well away from the reclaimed water supply lines.

CAUTION: Do not open attachments or click on links unless you recognize the sender and know the content is safe.

Response to the SWRCB regarding the Incident Report – Hope Elementary School, 3010 Tamarack Ave, Carlsbad, CA 92010 April 22, 2022 ATTACHMENT 7
Carlsbad School Recycled Test Dates
Site Address 4-Year Shutdown Due Date Schedule
Sage Creek High School. 3900 Cannon Rd 8/21/2018 2022 4/19/2022 Poinsettia Elementary 2445 Mica Rd 7/29/2019 2023 Summer 2022 Pacific Rim Elementary School 1190 Camino De Las Ondas 7/8/2019 2023 Summer 2022 Hope Elementary 3001 Tamarack Av Initial - 4/5/2017 2021 Waiting on plans Calavera Hills School 4100 Tamarack 7/16/2019 2023 Summer 2022 Aviara Oaks Middle School 6990 Ambrosia Ln 8/15/2018 2022 4/21/2022 Aviara Oaks Elem. School 6900 Ambrosia Ln 8/15/2018 2022 4/21/2022 Carrillo Elementary School 2875 Poinsettia Ln 8/8/2019 2023 Summer 2022 CUSD Request - moved up to summer 2022 Rescheduled to Summer 2022, CUSD Not Ready
Comments
CUSD Request - moved up to summer 2022
CUSD Request - moved up to summer 2022
CUSD Has Not Submitted Plans
CUSD Request - moved up to summer 2022
April 26, 2022
Sean Sterchi, PE
San Diego District Engineer
State Water Resources Control Board
Division of Drinking Water
1350 Front Street, Rm 2050
San Diego CA 92101
Dear Mr. Sterchi:

Ccarlsbad
Municipal Water District
EMAIL: [email protected]
The Carlsbad Municipal Water District discovered an incorrect document link in Attachment L to the March 15, 2022 Recycled Water Cross-Connection Incident Report for Hope Elementary School, Carlsbad Unified School District dated March 15, 2022.

Attachment Lis herewith reissued in its entirety with the August 13, 2021 laboratory test report provided by Carlsbad Unified School District.

Please feel free to contact me at [email protected] or 442-339-2356 if you have any questions.
st)�p�
Dave Padilla, PE
District Engineer
Attachment: Attachment L to the RW Cross-Connection Incident Report dated March 15, 2022 cc: Scott Chadwick, Executive Manager
Geoff Patnoe, Assistant Executive Manager
Celia Brewer, General Counsel
Paz Gomez, Deputy City Manager, Public Works
Carlsbad Municipal Water District
5950 El Camino Real I Carlsbad, CA 92008 I 442-339-2722 t

ATTACHMENT C
If
Incident Report – Hope Elementary School, 3010 Tamarack Ave, Carlsbad, CA 92010 Mar. 15, 2022

ATTACHMENT L
(Revised 4/26/22)
Hope Elementary School Water Issue
Frequently Asked Questions
2/28/2022
On Thursday, February 24, the City of Carlsbad was notified following a suspicion that the domestic water lines at Hope Elementary were crossed with reclaimed water irrigation lines on campus. Due to this suspicion, all water was immediately shut off on campus, and students were sent home.