REPORT OF LIMITED DRINKING WATER TESTING FOR LEAD AND COPPER CONTENT. SKY VALLEY EDUCATIONAL CENTER Monroe, Washington

Transcription

1 REPORT OF LIMITED DRINKING WATER TESTING FOR LEAD AND COPPER CONTENT SKY VALLEY EDUCATIONAL CENTER Monroe, Washington Prepared for MONROE SCHOOL DISTRICT 200 East Fremont Monroe, WA Prepared by PBS ENGINEERING + ENVIRONMENTAL 2517 Eastlake Avenue East, Suite 100 Seattle, WA This report is for the exclusive use of the client and is not to be relied upon by other parties. It is not to be photographed, photocopied, or similarly reproduced in total or in part without the expressed written consent of the client and PBS Engineering and Environmental. PBS Project No April 2016

2 REPORT OF LIMITED DRINKING WATER TESTING FOR LEAD AND COPPER CONTENT SKY VALLEY EDUCATIONAL CENTER MONROE, Washington TABLE OF CONTENTS Summary Report 1.0 Executive Summary... Page Introduction Methodology Findings Conclusions and Recommendations Resources Lead and Copper in Drinking Water 11 Attachments Attachment 1... Laboratory Reports Attachment 2... Data Table Attachment 3... Drawings Attachment 4... Laboratory Certifications Attachment 5... WSDH Fact Sheet

3 Report of Limited Drinking Water Testing for Lead and Copper Content Sky Valley Educational Center Monroe School District, Washington 1.0 EXECUTIVE SUMMARY PBS Engineering and Environmental (PBS) performed limited drinking water sampling for the Monroe School District at the Sky Valley Educational Center in The following report discusses details of the 2016 sampling effort including: background information, methodology, water sampling activities, findings, conclusions, recommendations and resources for additional information. Drinking water in Washington State is regulated by both the Environmental Protection Agency (EPA) and the Washington State Department of Health (DOH). The testing process followed the protocols described in the Environmental Protection Agency (EPA) document, Lead in Drinking Water in Schools and Non-Residential Buildings, EPA , All sampling and analyses procedures were conducted in accordance with EPA s publication , Lead in Drinking Water in Schools and Non-Residential Buildings. The Washington Administrative Code (WAC A-130 Lead and WAC A-135 Copper) has recently published drinking water testing procedures and criteria for copper and lead in schools. These codes do not become effective until July The current Monroe School District program meets and exceeds the requirements of the WAC. The Monroe School District selected the Sky Valley Educational Center to be tested for lead and copper in drinking water. The sampled facility was not found to have systemic or facility-wide lead or copper contamination in the drinking water. Two individual fixtures at the facilities were found to exceed the EPA and DOH criteria of >20 ppb lead, indicating localized contamination. The typical source of lead contamination at the Sky Valley facility appeared to be lead-containing fixtures. The fixtures that exceeded the EPA drinking water criteria were limited to the following: Woodshop sink Room D sink PBS collected a total of 70 drinking water samples at 69 sampling sites. Of the 69 sampling locations, a total of 2 or <3% of the sampling sites contained elevated levels of lead in the drinking water. The Woodshop sink was taken out of service and will no longer be used. The fixture in Room D was replaced and confirmation sampling was performed. Confirmation sampling results indicated the level of lead in the drinking water to be below the EPA criteria. The Monroe School District understands that public education and communication is an important element to this project. The Lead Contamination Control Act of 1988 has mandatory public notice requirements for reporting lead test results. There are two separate public availability notifications that schools must perform: making a copy of the sampling results available in the school administrative offices; and providing notification to relevant parent, teacher, and employee organizations that the sampling program results are available. PBS has assisted the Monroe School District with the development of a formal drinking water program. The plan includes sampling every 5 years at this facility. As part of the drinking water program, the District will continue to conduct follow-up periodic sampling to monitor the levels of lead and copper in drinking water. PBS Project No April 2016 Page 1 of 11

4 Report of Limited Drinking Water Testing for Lead and Copper Content Sky Valley Educational Center Monroe School District, Washington For more information regarding the Monroe School District s Drinking Water Program, contact Mr. Devlin Peplic, Drinking Water Program Director. PBS Project No April 2016 Page 2 of 11

5 Report of Limited Drinking Water Testing for Lead and Copper Content Sky Valley Educational Center Monroe School District, Washington 2.0 INTRODUCTION The Monroe School District requested PBS conduct drinking water sampling and analysis for lead and copper content. The Sky Valley Educational Center was selected by the Monroe School District for drinking water testing. Background Information Lead and copper are metals commonly found in drinking water. Levels of these metals in drinking water are regulated by the Environmental Protection Agency (EPA) and Washington Department of Health (DOH) due to their potential negative impacts on human health. Lead, a metal found in natural deposits, is commonly found in plumbing materials and water service lines. Although the main sources of exposure to lead are ingestion of paint chips and dust inhalation, EPA estimates that 10 to 20 percent of human exposure to lead may come from lead in drinking water. Infants who consume mixed formula can receive 40 to 60 percent of their exposure to lead from drinking water. Lead in drinking water can cause a variety of adverse health effects. The health effects of lead are most severe for infants and children, for whom exposure to lead in drinking water above the action level can result in delays in physical and mental development along with slight deficits in attention span and learning abilities. In adults, it can cause increases in blood pressure, and prolonged exposure can contribute to kidney problems or high blood pressure. Lead is rarely found in source water. Typically, lead gets into the system after the water leaves the local treatment plant or well. The source of lead in a facility s water is most likely the corrosion of lead containing pipes, fixtures or solder. This corrosion often occurs from a reaction between the water and the plumbing materials caused by dissolved oxygen, low ph (acidity) and low mineral content in water. Through the early 1900s, lead pipes were commonly used for interior plumbing. Plumbing installed before 1930 is most likely to contain lead. Between 1920 and 1950, galvanized pipes were also used for plumbing. After 1930, copper generally replaced lead as the most commonly used material for water pipes. Until the mid to late 1980s, before the lead-free requirements of the 1986 Safe Drinking Water Act, lead solder was used to join copper pipes. Buildings constructed after this period should have joints made of lead-free solders. In summary, homes and other buildings built before 1986 are more likely to have lead pipes, fixtures and solder. New buildings are not likely to have lead pipes in their plumbing systems, but are very likely to have copper pipes with solder joints or fixtures that contain lead alloys. However, new facilities are also at risk because plumbing that is legally considered lead-free may still contain up to 8 percent lead in the alloy. The most common problem is with brass or chromeplated brass faucets and fixtures, which can leach significant amounts of lead into the water, particularly hot water. The efforts of the public water suppliers over the years to minimize corrosiveness of the water may have helped mineral deposits form a coating on the inside of the PBS Project No April 2016 Page 3 of 11

6 Report of Limited Drinking Water Testing for Lead and Copper Content Sky Valley Educational Center Monroe School District, Washington pipes (scaling), which insulates the water from the plumbing and results in decreased lead levels. If the coating does not exist or is disturbed, water comes in direct contact with lead in the system. Copper is a naturally occurring metal that is an essential element for all living organisms. However, exposure to elevated levels of copper may cause intestinal and stomach related problems, liver or kidney damage and complications of Wilson s disease in those who are genetically predisposed. High levels of copper occur in drinking water when corrosive water comes in contact with copper plumbing and copper-containing fixtures in the water distribution system. PBS Project No April 2016 Page 4 of 11

7 Report of Limited Drinking Water Testing for Lead and Copper Content Sky Valley Educational Center Monroe School District, Washington 3.0 METHODOLOGY The Monroe School District conducted a walkthrough of the Sky Valley Educational Center to help determine sampling locations. Based on the initial site walkthrough, a sampling plan was developed by PBS and the Monroe School District. The following drinking water sources were selected for testing: Drinking fountains Food preparation sinks Restroom sinks Art room sinks Science room sinks Ice makers Representative sinks that are known to be used for drinking water, such as sinks in offices and staff and break rooms Representative health/nurse room sinks Representative home economics sinks The sampling process followed the protocols described in the Environmental Protection Agency (EPA) document, Lead in Drinking Water in Schools and Non-Residential Buildings, EPA , The drinking water sampling was conducted in February The sample collection procedures were generally as follows: 1. Selected fixtures were flushed for approximately one minute the day prior to sampling. 2. District management communicated with building users to not use the drinking water after flushing until completion of the drinking water sampling activities. 3. Samples were collected after the water had been sitting in the pipes for 8 18 hours. The first draw samples consisted of the first 250 milliliters (ml) of water from the source without wasting any water. 4. The samples were assigned unique identification numbers and the drawings were labeled to identify each location. Hard copy drawings were provided by the Monroe School District. 5. Chain-of-custody documentation was completed and cross-referenced with drawings and container labels. 6. The samples were delivered to the laboratory for analysis within hours of sample collection. All samples were collected in pre-cleaned 250 ml plastic bottles provided by the laboratory. The sample bottles were labeled with unique identification numbers and the sample locations identified on drawings. The sample numbering scheme for sample identification is as follows: 000 Series Numbers - Initial Sampling (250 ml-1 st draw and flush draw samples) 100 Series Numbers Confirmation Sampling (250 ml) A total of 70 samples were collected from Sky Valley Education Center and delivered for analysis PBS Project No April 2016 Page 5 of 11

8 Report of Limited Drinking Water Testing for Lead and Copper Content Sky Valley Educational Center Monroe School District, Washington under chain-of-custody protocols to OnSite Environmental Inc. in Redmond, Washington (Washington State Certified Drinking Water Laboratory). All samples were collected and tested in accordance with EPA Method for total lead and copper in drinking water. Copies of the laboratory reports are provided in Attachment 1. A Water Quality Data Table is provided in Attachment 2. The table lists sample identification numbers, sample locations, laboratory results for lead and copper content, and the regulatory standards for comparison. Additionally, drawings are provided in Attachment 3. The drawings show sample locations. 4.0 FINDINGS Of the 70 samples collected, 2 or 3% of the samples were found to exceed the lead threshold concentration of >20 ppb. Attachment 2 is a summary of those sampling results. Samples ( Initial Testing ) collected from drinking water sources were compared to the Lead in Drinking Water in Schools and Non-Residential Buildings drinking water standard, in which concentrations of lead greater than 20 parts per billion (ppb) or 1.3 parts per million (ppm) copper are considered contaminated. When this threshold or action level is reached, remedial action ( Remediation Plan ) and Follow-up Testing is recommended by the EPA. The following sites that did not meet the EPA criteria for lead or copper content in drinking water are listed below: Woodshop sink Room D sink In general, the sources of elevated lead content in drinking water at the Sky Valley Educational Center are thought to have been caused by the corrosion of fixtures containing alloys of lead. No systemic or widespread lead contamination was revealed in the drinking water as a result of this sampling activity. In general, widespread lead contamination in drinking water can be expected when: The building s plumbing is less than 5 years old and lead solder had been illegally used (i.e., after the lead-free requirements of the 1986 Safe Drinking Water Act took effect). Brass fittings, faucets, and valves were installed throughout the building less than 1 year ago (even though they may contain less than 8 percent lead as required under the lead-free requirements of the Safe Drinking Water Act). The water is corrosive. Sediment in the plumbing and screens contains lead. Lead pipes are used throughout the building. The service connector (i.e., the pipe that carries water from the public water system main to the building) is made of lead. In general, localized contamination can be expected if: The water is non-corrosive. Lead pipes are used in some locations. PBS Project No April 2016 Page 6 of 11

9 Report of Limited Drinking Water Testing for Lead and Copper Content Sky Valley Educational Center Monroe School District, Washington Some brass fittings, faucets, and valves have been installed in the last year (even though they may contain less than 8 percent lead). Numerous lead solder joints were installed in short sections of pipe before 1986 or were illegally installed after 1986 (i.e., after the lead-free requirements of the Safe Drinking Water Act took effect). There are areas in the building s plumbing with low flow or infrequent use. Sediment in the plumbing and screens at isolated locations contain lead. 5.0 CONCLUSIONS AND RECOMMENDATIONS Two of the 69 individual fixtures at the facilities were found to exceed the EPA and DOH criteria of >20 ppb lead, indicating localized contamination. No elevated concentrations of copper were found. The fixtures that exceeded the EPA drinking water criteria were limited to the following: Woodshop sink Room D sink The Woodshop sink was taken out of service and will no longer be used. The fixture in Room D was replaced and confirmation sampling was performed. Confirmation sampling results indicated that the level of lead in the drinking water was below the EPA criteria. The cause of lead contamination in Room D at the Sky Valley facility appeared to be a leadcontaining fixture. It is prudent to provide short-term and long-term remedies to help prevent possible future exposures to lead. Site-specific remedies for elevated lead or copper in drinking water are beyond the scope of this report. However, PBS has provided Monroe School District with guidance on appropriate options of short-term remedies for individual fixtures until long-term remedies were established and performed. It is our understanding that the long-term remedies established and performed by the Northshore School District on sampling sites that contained elevated concentrations of lead or copper included the following: Installed point of use (POU) water treatment devices (i.e. filters) Performed outlet/fixture replacement Permanently removed the fixture Permanently removed the supply piping and turned off the water source Performed piping replacement Drinking Water Program PBS has been assisting the Monroe School District with the development of a formal drinking water program. A drinking water program should address the following: PBS Project No April 2016 Page 7 of 11

10 Report of Limited Drinking Water Testing for Lead and Copper Content Sky Valley Educational Center Monroe School District, Washington 1. Assigning a Water Quality Program Director Designate a lead person to be in charge of all sampling and analysis activities. This person should be familiar with the Monroe School District facilities and be knowledgeable about the appropriate sampling and analysis procedures and protocols. 2. Developing Written Sampling and Reporting Protocols A written sampling plan is highly recommended. It will clarify procedures for any personnel, whether employees or contractors, who are involved in the sampling program. Conduct a pre-sampling inspection. Identify each outlet that will be tested for lead. Check aerators for debris; clean if necessary. Make note of water cooler make and model, and any locations where electrical wires are grounded to water pipes. Identify locations of recalled water coolers. The sampling protocols and process should follow the guidance provided in the Environmental Protection Agency (EPA) document, Lead in Drinking Water in Schools and Non-Residential Buildings, EPA , At a minimum the protocols should include the following: Document a lead person in charge of all sampling and analysis activities, Identify and prioritize locations for collecting samples, Identify sample types (i.e. flush or first draw) and frequency to be collected, Identify analysis method to be performed and the certified drinking water laboratory to conduct the analyses, Identify sample pricing and turnaround, Identify trained personnel to collect samples and maintain records, Communicate plans to the necessary administrative, building and other appropriate personnel. Be open about goals to avoid confusion and communication breakdowns at a later stage. Communicate the plan to maintenance staff, teachers, parents, and students and identify their roles in it. Realistically, students and staff regularly use some outlets and not others for drinking, cooking, or even making coffee. Other outlets, such as a mop sink in a utility closet, would rarely be used for consumption. Therefore, it is prudent to prioritize sources of drinking water for sampling, as necessary. At a minimum the following types of sites should be evaluated: drinking fountains, kitchen sinks, home economics room sinks, staff lounge sinks, health/nurse s office sinks, special education classroom sinks, any sink known to be used for consumption, classroom cooking sinks, bathroom faucets/sinks known to be used for drinking water, and utility sinks and hose attachments potentially used to fill water jugs for sports team practice. PBS recommends that follow-up representative sampling be conducted every 5 years for all sites that are used for drinking water. Priority should be given to those sites that tested 10 ppb or greater for lead content or 0.65 ppm or greater for copper content. In addition to sampling individual fixtures, it is also important to check for recalled water coolers. Certain Halsey-Taylor water coolers were recalled by the Consumer Product Safety Commission in 1990 because they were manufactured with lead-lined tanks. Other coolers had other lead-containing parts or lead solder. PBS Project No April 2016 Page 8 of 11

11 Report of Limited Drinking Water Testing for Lead and Copper Content Sky Valley Educational Center Monroe School District, Washington 3. Developing Written Protocols for Plumbing Repair and Renovation Activities Once testing has been conducted and it is determined that elevated levels of lead or copper are present in the drinking water at a specific site it is important to initiate routine, short-term and long-term remedies. Depending on the plumbing profile, Monroe School District has chosen to perform and implement each of the following routine practices as needed: Routine Practices Clean debris from accessible screens (aerators) frequently. Clean and inspect periodically. Periodically thoroughly flush holding tanks to remove sediment. Use only cold water for food and beverage preparation in kitchens and cooking classes. Flush all fixtures after significant periods of non-use such as at the end of summer vacation, Christmas vacation, Thanksgiving vacation, etc. Additionally, the Monroe School District has chosen to perform and implement the following short-term and long-term remedial activities as appropriate; Short-term Remedies Clean debris from all accessible screens Remove the fixture or turn off the water source Use only bottled water Flush each individual fixture every morning or after every 6 hour period of non-use Long-term Remedies After obtaining an understanding of the water supply including water characteristics and the lead conditions in the facility as a result of testing, permanent remedies should be examined and the most appropriate to the situation selected. Install corrosion control devices for individual buildings, known as point-of-entry devices. Consult a mechanical systems professional with expertise in water treatment systems. The Water Quality Association (WQA), National Sanitation Foundation (NSF) and the Underwriters Laboratory (UL) certify water treatment systems according to the contaminants that are removed. This information is available on the Internet. Installation of Point of Use (POU) water treatment devices such as filters that control lead at the tap. Remove existing wires that are grounded to piping, which causes corrosion. Find alternate grounding for electrical wires that are grounded to water pipes. Replace outlets that exhibit localized contamination with new, certified components. EPA recognizes NSF Standard 61 Section 9 as a performance standard, limiting the leaching of lead into the drinking water for devices that are intended by the manufacturer to dispense water for human ingestion. Require contractors and in-house staff to be sure that all plumbing repair or replacement work is performed with only lead free materials Replace lead service lines and other lead pipes. PBS Project No April 2016 Page 9 of 11

12 Report of Limited Drinking Water Testing for Lead and Copper Content Sky Valley Educational Center Monroe School District, Washington 4. Public Education and Communication - Public Education and Communication is also important. The Lead Contamination Control Act of 1988 and the Washington State Department of Health Chapter Lead and Copper Regulations have mandatory public notice requirements for reporting lead and copper test results. As such, there are two separate public availability notices the Monroe School District must perform: A copy of the sampling results must be made available in the school administrative offices for inspection by the public, including teachers, other school personnel, and parents. The District must provide notification to relevant parent, teacher, and employee organizations that the sampling program results are available. This can be accomplished by making a press release or sending letters, including stuffers in mailboxes, paychecks and/or in staff newsletters. There are numerous resources available to learn more about lead and copper in drinking water. Section 6.0 and Attachment 5 provides lists of resources. PBS Project No April 2016 Page 10 of 11

13 Report of Limited Drinking Water Testing for Lead and Copper Content Sky Valley Educational Center Monroe School District, Washington 6.0 RESOURCES - LEAD IN DRINKING WATER American Water Works Association (AWWA) Central Puget Sound Water Suppliers' Forum A forum to discuss and represent a shared input into the State and regional water supply strategies & programs. Department of Ecology EPA Office of Ground Water and Drinking Water (OGWDW) - EPA Spanish Web Site EPA Region 10 EPA Drinking Water and Health Advisories EPA Drinking Water Academy Training courses Local Health Departments- Washington State National Sanitation Foundation (NSF) Product Certification Listings USC Foundation for Cross Connection Control and Hydraulic Research -Approved backflow assemblies and more U.S. Geological Survey (USGS) Water Wiser: Conservation/Water-Related Internet Resources Water Supply Advisory Committee (WSAC) WA State Public Works Board Financial assistance Washington Environmental Training Center (WETRC) Laws and Regulations Attorney General Opinions Code of Federal Regulations WAC Public Water Supplies Search for Title 246 (Dept. of Health), Chapter 290 (Public Water Supplies) WA Legislation site 2nd DRAFT of proposed changes to Chapter Washington Administrative Code (WAC) Washington State Register Publishes proposed changes, announcements of public hearings, and final rules. PBS Project No April 2016 Page 11 of 11

14 Attachment 1 LABORATORY REPORTS

15 14648 NE 95 th Street, Redmond, WA (425) February 18, 2016 Gregg Middaugh PBS Engineering & Environmental 2517 Eastlake Avenue E., Suite 100 Seattle, WA Re: Analytical Data for Project ; Sky Valley Ed. Center Laboratory Reference No Dear Gregg: Enclosed are the analytical results and associated quality control data for samples submitted on February 11, The standard policy of OnSite Environmental, Inc. is to store your samples for 30 days from the date of receipt. If you require longer storage, please contact the laboratory. We appreciate the opportunity to be of service to you on this project. If you have any questions concerning the data, or need additional information, please feel free to call me. Sincerely, David Baumeister Project Manager Enclosures OnSite Environmental, Inc NE 95 th Street, Redmond, WA (425) This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed.

16 2 Date of Report: February 18, 2016 Samples Submitted: February 11, 2016 Laboratory Reference: Project: ; Sky Valley Ed. Center Case Narrative Samples were collected on February 11, 2016 and received by the laboratory on February 11, They were maintained at the laboratory at a temperature of 2 o C to 6 o C. General QA/QC issues associated with the analytical data enclosed in this laboratory report will be indicated with a reference to a comment or explanation on the Data Qualifier page. More complex and involved QA/QC issues will be discussed in detail below. OnSite Environmental, Inc NE 95 th Street, Redmond, WA (425) This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed.

17 3 Date of Report: February 18, 2016 Samples Submitted: February 11, 2016 Laboratory Reference: Project: ; Sky Valley Ed. Center DRINKING WATER METALS EPA Matrix: Units: Water ug/l (ppb) Date Date Analyte Result PQL EPA Method Prepared Analyzed Flags Lab ID: Client ID: SVEC-001-S (2016) Copper Lead ND Lab ID: Client ID: SVEC-002-S (2016) Copper Lead ND Lab ID: Client ID: SVEC-003-S (2016) Copper Lead ND Lab ID: Client ID: SVEC-004-S (2016) Copper Lead ND Lab ID: Client ID: SVEC-005-S (2016) Copper Lead Lab ID: Client ID: SVEC-006-DF (2016) Copper Lead ND OnSite Environmental, Inc NE 95 th Street, Redmond, WA (425) This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed.

18 4 Date of Report: February 18, 2016 Samples Submitted: February 11, 2016 Laboratory Reference: Project: ; Sky Valley Ed. Center DRINKING WATER METALS EPA Matrix: Units: Water ug/l (ppb) Date Date Analyte Result PQL EPA Method Prepared Analyzed Flags Lab ID: Client ID: SVEC-007-S (2016) Copper Lead Lab ID: Client ID: SVEC-008-S (2016) Copper Lead Lab ID: Client ID: SVEC-009-S (2016) Copper Lead Lab ID: Client ID: SVEC-010-S (2016) Copper Lead Lab ID: Client ID: SVEC-011-S (2016) Copper Lead Lab ID: Client ID: SVEC-012-S (2016) Copper Lead ND OnSite Environmental, Inc NE 95 th Street, Redmond, WA (425) This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed.

19 5 Date of Report: February 18, 2016 Samples Submitted: February 11, 2016 Laboratory Reference: Project: ; Sky Valley Ed. Center DRINKING WATER METALS EPA Matrix: Units: Water ug/l (ppb) Date Date Analyte Result PQL EPA Method Prepared Analyzed Flags Lab ID: Client ID: SVEC-013-DF (2016) Copper ND Lead ND Lab ID: Client ID: SVEC-014-S (2016) Copper ND Lead ND Lab ID: Client ID: SVEC-015-DF (2016) Copper Lead ND Lab ID: Client ID: SVEC-016-S (2016) Copper Lead ND Lab ID: Client ID: SVEC-017-DF (2016) Copper Lead ND Lab ID: Client ID: SVEC-018-S (2016) Copper Lead ND OnSite Environmental, Inc NE 95 th Street, Redmond, WA (425) This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed.

20 6 Date of Report: February 18, 2016 Samples Submitted: February 11, 2016 Laboratory Reference: Project: ; Sky Valley Ed. Center DRINKING WATER METALS EPA Matrix: Units: Water ug/l (ppb) Date Date Analyte Result PQL EPA Method Prepared Analyzed Flags Lab ID: Client ID: SVEC-019-DF (2016) Copper Lead ND Lab ID: Client ID: SVEC-020-S (2016) Copper Lead Lab ID: Client ID: SVEC-021-DF (2016) Copper Lead ND Lab ID: Client ID: SVEC-022-S (2016) Copper Lead ND Lab ID: Client ID: SVEC-023-DF (2016) Copper Lead ND Lab ID: Client ID: SVEC-024-S (2016) Copper Lead ND OnSite Environmental, Inc NE 95 th Street, Redmond, WA (425) This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed.

21 7 Date of Report: February 18, 2016 Samples Submitted: February 11, 2016 Laboratory Reference: Project: ; Sky Valley Ed. Center DRINKING WATER METALS EPA Matrix: Units: Water ug/l (ppb) Date Date Analyte Result PQL EPA Method Prepared Analyzed Flags Lab ID: Client ID: SVEC-025-S (2016) Copper Lead ND Lab ID: Client ID: SVEC-026-S (2016) Copper Lead Lab ID: Client ID: SVEC-027-S (2016) Copper Lead ND Lab ID: Client ID: SVEC-028-S (2016) Copper Lead Lab ID: Client ID: SVEC-029-S (2016) Copper Lead Lab ID: Client ID: SVEC-030-DF (2016) Copper Lead ND OnSite Environmental, Inc NE 95 th Street, Redmond, WA (425) This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed.

22 8 Date of Report: February 18, 2016 Samples Submitted: February 11, 2016 Laboratory Reference: Project: ; Sky Valley Ed. Center DRINKING WATER METALS EPA Matrix: Units: Water ug/l (ppb) Date Date Analyte Result PQL EPA Method Prepared Analyzed Flags Lab ID: Client ID: SVEC-031-S (2016) Copper Lead ND Lab ID: Client ID: SVEC-032-I (2016) Copper ND Lead ND Lab ID: Client ID: SVEC-033-DF (2016) Copper Lead ND Lab ID: Client ID: SVEC-034-S (2016) Copper Lead Lab ID: Client ID: SVEC-035-S (2016) Copper Lead Lab ID: Client ID: SVEC-036-S (2016) Copper Lead OnSite Environmental, Inc NE 95 th Street, Redmond, WA (425) This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed.

23 9 Date of Report: February 18, 2016 Samples Submitted: February 11, 2016 Laboratory Reference: Project: ; Sky Valley Ed. Center DRINKING WATER METALS EPA Matrix: Units: Water ug/l (ppb) Date Date Analyte Result PQL EPA Method Prepared Analyzed Flags Lab ID: Client ID: SVEC-037-S (2016) Copper Lead ND Lab ID: Client ID: SVEC-038-DF (2016) Copper Lead ND Lab ID: Client ID: SVEC-039-S (2016) Copper Lead Lab ID: Client ID: SVEC-040-S (2016) Copper Lead Lab ID: Client ID: SVEC-041-S (2016) Copper Lead ND Lab ID: Client ID: SVEC-042-S (2016) Copper Lead ND OnSite Environmental, Inc NE 95 th Street, Redmond, WA (425) This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed.

24 10 Date of Report: February 18, 2016 Samples Submitted: February 11, 2016 Laboratory Reference: Project: ; Sky Valley Ed. Center DRINKING WATER METALS EPA Matrix: Units: Water ug/l (ppb) Date Date Analyte Result PQL EPA Method Prepared Analyzed Flags Lab ID: Client ID: SVEC-043-S (2016) Copper Lead ND Lab ID: Client ID: SVEC-044-S (2016) Copper Lead ND Lab ID: Client ID: SVEC-045-S (2016) Copper Lead Lab ID: Client ID: SVEC-046-S (2016) Copper Lead Lab ID: Client ID: SVEC-047-S (2016) Copper Lead ND Lab ID: Client ID: SVEC-048-DF (2016) Copper Lead ND OnSite Environmental, Inc NE 95 th Street, Redmond, WA (425) This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed.

25 11 Date of Report: February 18, 2016 Samples Submitted: February 11, 2016 Laboratory Reference: Project: ; Sky Valley Ed. Center DRINKING WATER METALS EPA Matrix: Units: Water ug/l (ppb) Date Date Analyte Result PQL EPA Method Prepared Analyzed Flags Lab ID: Client ID: SVEC-049-S (2016) Copper Lead Lab ID: Client ID: SVEC-050-S (2016) Copper Lead ND Lab ID: Client ID: SVEC-051-S (2016) Copper Lead Lab ID: Client ID: SVEC-052-S (2016) Copper Lead ND Lab ID: Client ID: SVEC-053-S (2016) Copper Lead ND Lab ID: Client ID: SVEC-054-DF (2016) Copper Lead ND OnSite Environmental, Inc NE 95 th Street, Redmond, WA (425) This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed.

26 12 Date of Report: February 18, 2016 Samples Submitted: February 11, 2016 Laboratory Reference: Project: ; Sky Valley Ed. Center DRINKING WATER METALS EPA Matrix: Units: Water ug/l (ppb) Date Date Analyte Result PQL EPA Method Prepared Analyzed Flags Lab ID: Client ID: SVEC-055-S (2016) Copper ND Lead ND Lab ID: Client ID: SVEC-056-S (2016) Copper Lead Lab ID: Client ID: SVEC-057-S (2016) Copper Lead Lab ID: Client ID: SVEC-058-S (2016) Copper Lead ND Lab ID: Client ID: SVEC-059-S (2016) Copper Lead ND Lab ID: Client ID: SVEC-060-S (2016) Copper Lead ND OnSite Environmental, Inc NE 95 th Street, Redmond, WA (425) This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed.

27 13 Date of Report: February 18, 2016 Samples Submitted: February 11, 2016 Laboratory Reference: Project: ; Sky Valley Ed. Center DRINKING WATER METALS EPA Matrix: Units: Water ug/l (ppb) Date Date Analyte Result PQL EPA Method Prepared Analyzed Flags Lab ID: Client ID: SVEC-069-I (2016) Copper ND Lead ND OnSite Environmental, Inc NE 95 th Street, Redmond, WA (425) This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed.

28 14 Date of Report: February 18, 2016 Samples Submitted: February 11, 2016 Laboratory Reference: Project: ; Sky Valley Ed. Center DRINKING WATER METALS EPA METHOD BLANK QUALITY CONTROL Date Analyzed: Matrix: Units: Water ug/l (ppb) Lab ID: MB0212DW1 Analyte Method Result PQL Copper ND 50 Lead ND 5.0 OnSite Environmental, Inc NE 95 th Street, Redmond, WA (425) This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed.

29 15 Date of Report: February 18, 2016 Samples Submitted: February 11, 2016 Laboratory Reference: Project: ; Sky Valley Ed. Center DRINKING WATER METALS EPA METHOD BLANK QUALITY CONTROL Date Analyzed: Matrix: Units: Water ug/l (ppb) Lab ID: MB0212DW2 Analyte Method Result PQL Copper ND 50 Lead ND 5.0 OnSite Environmental, Inc NE 95 th Street, Redmond, WA (425) This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed.

30 16 Date of Report: February 18, 2016 Samples Submitted: February 11, 2016 Laboratory Reference: Project: ; Sky Valley Ed. Center DRINKING WATER METALS EPA METHOD BLANK QUALITY CONTROL Date Analyzed: Matrix: Units: Water ug/l (ppb) Lab ID: MB0216DW1 Analyte Method Result PQL Copper ND 50 Lead ND 5.0 OnSite Environmental, Inc NE 95 th Street, Redmond, WA (425) This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed.

31 17 Date of Report: February 18, 2016 Samples Submitted: February 11, 2016 Laboratory Reference: Project: ; Sky Valley Ed. Center DRINKING WATER METALS EPA METHOD BLANK QUALITY CONTROL Date Extracted: Date Analyzed: Matrix: Units: Water ug/l (ppb) Lab ID: MB0216WH1 Analyte Method Result PQL Copper ND 50 Lead ND 5.0 OnSite Environmental, Inc NE 95 th Street, Redmond, WA (425) This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed.

32 18 Date of Report: February 18, 2016 Samples Submitted: February 11, 2016 Laboratory Reference: Project: ; Sky Valley Ed. Center DRINKING WATER METALS EPA DUPLICATE QUALITY CONTROL Date Analyzed: Matrix: Units: Water ug/l (ppb) Lab ID: Sample Duplicate Analyte Result Result RPD PQL Flags Copper Lead ND ND NA 5.0 OnSite Environmental, Inc NE 95 th Street, Redmond, WA (425) This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed.

33 19 Date of Report: February 18, 2016 Samples Submitted: February 11, 2016 Laboratory Reference: Project: ; Sky Valley Ed. Center DRINKING WATER METALS EPA DUPLICATE QUALITY CONTROL Date Analyzed: Matrix: Units: Water ug/l (ppb) Lab ID: Sample Duplicate Analyte Result Result RPD PQL Flags Copper Lead ND ND NA 5.0 OnSite Environmental, Inc NE 95 th Street, Redmond, WA (425) This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed.

34 20 Date of Report: February 18, 2016 Samples Submitted: February 11, 2016 Laboratory Reference: Project: ; Sky Valley Ed. Center DRINKING WATER METALS EPA DUPLICATE QUALITY CONTROL Date Analyzed: Matrix: Units: Water ug/l (ppb) Lab ID: Sample Duplicate Analyte Result Result RPD PQL Flags Copper Lead ND ND NA 5.0 OnSite Environmental, Inc NE 95 th Street, Redmond, WA (425) This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed.

35 21 Date of Report: February 18, 2016 Samples Submitted: February 11, 2016 Laboratory Reference: Project: ; Sky Valley Ed. Center DRINKING WATER METALS EPA DUPLICATE QUALITY CONTROL Date Extracted: Date Analyzed: Matrix: Units: Water ug/l (ppb) Lab ID: Sample Duplicate Analyte Result Result RPD PQL Flags Copper Lead OnSite Environmental, Inc NE 95 th Street, Redmond, WA (425) This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed.

36 22 Date of Report: February 18, 2016 Samples Submitted: February 11, 2016 Laboratory Reference: Project: ; Sky Valley Ed. Center DRINKING WATER METALS EPA MS/MSD QUALITY CONTROL Date Analyzed: Matrix: Units: Water ug/l (ppb) Lab ID: Spike Percent Percent Analyte Level MS Recovery MSD Recovery RPD Flags Copper Lead OnSite Environmental, Inc NE 95 th Street, Redmond, WA (425) This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed.

37 23 Date of Report: February 18, 2016 Samples Submitted: February 11, 2016 Laboratory Reference: Project: ; Sky Valley Ed. Center DRINKING WATER METALS EPA MS/MSD QUALITY CONTROL Date Analyzed: Matrix: Units: Water ug/l (ppb) Lab ID: Spike Percent Percent Analyte Level MS Recovery MSD Recovery RPD Flags Copper Lead OnSite Environmental, Inc NE 95 th Street, Redmond, WA (425) This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed.

38 24 Date of Report: February 18, 2016 Samples Submitted: February 11, 2016 Laboratory Reference: Project: ; Sky Valley Ed. Center DRINKING WATER METALS EPA MS/MSD QUALITY CONTROL Date Analyzed: Matrix: Units: Water ug/l (ppb) Lab ID: Spike Percent Percent Analyte Level MS Recovery MSD Recovery RPD Flags Copper Lead OnSite Environmental, Inc NE 95 th Street, Redmond, WA (425) This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed.

39 25 Date of Report: February 18, 2016 Samples Submitted: February 11, 2016 Laboratory Reference: Project: ; Sky Valley Ed. Center DRINKING WATER METALS EPA MS/MSD QUALITY CONTROL Date Extracted: Date Analyzed: Matrix: Units: Water ug/l (ppb) Lab ID: Spike Percent Percent Analyte Level MS Recovery MSD Recovery RPD Flags Copper Lead OnSite Environmental, Inc NE 95 th Street, Redmond, WA (425) This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed.

40 26 Data Qualifiers and Abbreviations A - Due to a high sample concentration, the amount spiked is insufficient for meaningful MS/MSD recovery data. B - The analyte indicated was also found in the blank sample. C - The duplicate RPD is outside control limits due to high result variability when analyte concentrations are within five times the quantitation limit. E - The value reported exceeds the quantitation range and is an estimate. F - Surrogate recovery data is not available due to the high concentration of coeluting target compounds. H - The analyte indicated is a common laboratory solvent and may have been introduced during sample preparation, and be impacting the sample result. I - Compound recovery is outside of the control limits. J - The value reported was below the practical quantitation limit. The value is an estimate. K - Sample duplicate RPD is outside control limits due to sample inhomogeneity. The sample was re-extracted and re-analyzed with similar results. L - The RPD is outside of the control limits. M - Hydrocarbons in the gasoline range are impacting the diesel range result. M1 - Hydrocarbons in the gasoline range (toluene-napthalene) are present in the sample. N - Hydrocarbons in the lube oil range are impacting the diesel range result. N1 - Hydrocarbons in diesel range are impacting lube oil range results. O - Hydrocarbons indicative of heavier fuels are present in the sample and are impacting the gasoline result. P - The RPD of the detected concentrations between the two columns is greater than 40. Q - Surrogate recovery is outside of the control limits. S - Surrogate recovery data is not available due to the necessary dilution of the sample. T - The sample chromatogram is not similar to a typical. U - The analyte was analyzed for, but was not detected above the reported sample quantitation limit. U1 - The practical quantitation limit is elevated due to interferences present in the sample. V - Matrix Spike/Matrix Spike Duplicate recoveries are outside control limits due to matrix effects. W - Matrix Spike/Matrix Spike Duplicate RPD are outside control limits due to matrix effects. X - Sample extract treated with a mercury cleanup procedure. X1- Sample extract treated with a Sulfuric acid/silica gel cleanup procedure. Y - The calibration verification for this analyte exceeded the 20% drift specified in method 8260C, and therefore the reported result should be considered an estimate. The overall performance of the calibration verification standard met the acceptance criteria of the method. Z - ND - Not Detected at PQL PQL - Practical Quantitation Limit RPD - Relative Percent Difference OnSite Environmental, Inc NE 95 th Street, Redmond, WA (425) This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed.

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48 14648 NE 95 th Street, Redmond, WA (425) February 18, 2016 Gregg Middaugh PBS Engineering & Environmental 2517 Eastlake Avenue E., Suite 100 Seattle, WA Re: Analytical Data for Project Laboratory Reference No Dear Gregg: Enclosed are the analytical results and associated quality control data for samples submitted on February 12, The standard policy of OnSite Environmental, Inc. is to store your samples for 30 days from the date of receipt. If you require longer storage, please contact the laboratory. We appreciate the opportunity to be of service to you on this project. If you have any questions concerning the data, or need additional information, please feel free to call me. Sincerely, David Baumeister Project Manager Enclosures OnSite Environmental, Inc NE 95 th Street, Redmond, WA (425) This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed.

49 2 Date of Report: February 18, 2016 Samples Submitted: February 12, 2016 Laboratory Reference: Project: Case Narrative Samples were collected on February 11 and 12, 2016 and received by the laboratory on February 12, They were maintained at the laboratory at a temperature of 2 o C to 6 o C. Please note that any and all soil sample results are reported on a dry-weight basis, unless otherwise noted below. General QA/QC issues associated with the analytical data enclosed in this laboratory report will be indicated with a reference to a comment or explanation on the Data Qualifier page. More complex and involved QA/QC issues will be discussed in detail below. OnSite Environmental, Inc NE 95 th Street, Redmond, WA (425) This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed.

50 3 Date of Report: February 18, 2016 Samples Submitted: February 12, 2016 Laboratory Reference: Project: DRINKING WATER METALS EPA Matrix: Units: Water ug/l (ppb) Date Date Analyte Result PQL EPA Method Prepared Analyzed Flags Lab ID: Client ID: SVEC-062-DF (2016) Copper Lead ND Lab ID: Client ID: SVEC-063-S (2016) Copper Lead ND Lab ID: Client ID: SVEC-064-S (2016) Copper Lead ND Lab ID: Client ID: SVEC-065-S (2016) Copper Lead Lab ID: Client ID: SVEC-066-DF (2016) Copper Lead ND Lab ID: Client ID: SVEC-067-DF (2016) Copper Lead ND OnSite Environmental, Inc NE 95 th Street, Redmond, WA (425) This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed.

51 4 Date of Report: February 18, 2016 Samples Submitted: February 12, 2016 Laboratory Reference: Project: DRINKING WATER METALS EPA Matrix: Units: Water ug/l (ppb) Date Date Analyte Result PQL EPA Method Prepared Analyzed Flags Lab ID: Client ID: SVEC-068-S (2016) Copper Lead Lab ID: Client ID: SVEC-070-CP (2016) Copper Lead ND OnSite Environmental, Inc NE 95 th Street, Redmond, WA (425) This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed.

52 5 Date of Report: February 18, 2016 Samples Submitted: February 12, 2016 Laboratory Reference: Project: DRINKING WATER METALS EPA METHOD BLANK QUALITY CONTROL Date Analyzed: Matrix: Units: Water ug/l (ppb) Lab ID: MB0218DW1 Analyte Method Result PQL Copper ND 50 Lead ND 5.0 OnSite Environmental, Inc NE 95 th Street, Redmond, WA (425) This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed.

53 6 Date of Report: February 18, 2016 Samples Submitted: February 12, 2016 Laboratory Reference: Project: DRINKING WATER METALS EPA DUPLICATE QUALITY CONTROL Date Analyzed: Matrix: Units: Water ug/l (ppb) Lab ID: Sample Duplicate Analyte Result Result RPD PQL Flags Copper Lead ND ND NA 5.0 OnSite Environmental, Inc NE 95 th Street, Redmond, WA (425) This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed.

54 7 Date of Report: February 18, 2016 Samples Submitted: February 12, 2016 Laboratory Reference: Project: DRINKING WATER METALS EPA MS/MSD QUALITY CONTROL Date Analyzed: Matrix: Units: Water ug/l (ppb) Lab ID: Spike Percent Percent Analyte Level MS Recovery MSD Recovery RPD Flags Copper Lead OnSite Environmental, Inc NE 95 th Street, Redmond, WA (425) This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed.

55 8 Data Qualifiers and Abbreviations A - Due to a high sample concentration, the amount spiked is insufficient for meaningful MS/MSD recovery data. B - The analyte indicated was also found in the blank sample. C - The duplicate RPD is outside control limits due to high result variability when analyte concentrations are within five times the quantitation limit. E - The value reported exceeds the quantitation range and is an estimate. F - Surrogate recovery data is not available due to the high concentration of coeluting target compounds. H - The analyte indicated is a common laboratory solvent and may have been introduced during sample preparation, and be impacting the sample result. I - Compound recovery is outside of the control limits. J - The value reported was below the practical quantitation limit. The value is an estimate. K - Sample duplicate RPD is outside control limits due to sample inhomogeneity. The sample was re-extracted and re-analyzed with similar results. L - The RPD is outside of the control limits. M - Hydrocarbons in the gasoline range are impacting the diesel range result. M1 - Hydrocarbons in the gasoline range (toluene-napthalene) are present in the sample. N - Hydrocarbons in the lube oil range are impacting the diesel range result. N1 - Hydrocarbons in diesel range are impacting lube oil range results. O - Hydrocarbons indicative of heavier fuels are present in the sample and are impacting the gasoline result. P - The RPD of the detected concentrations between the two columns is greater than 40. Q - Surrogate recovery is outside of the control limits. S - Surrogate recovery data is not available due to the necessary dilution of the sample. T - The sample chromatogram is not similar to a typical. U - The analyte was analyzed for, but was not detected above the reported sample quantitation limit. U1 - The practical quantitation limit is elevated due to interferences present in the sample. V - Matrix Spike/Matrix Spike Duplicate recoveries are outside control limits due to matrix effects. W - Matrix Spike/Matrix Spike Duplicate RPD are outside control limits due to matrix effects. X - Sample extract treated with a mercury cleanup procedure. X1- Sample extract treated with a Sulfuric acid/silica gel cleanup procedure. Y - The calibration verification for this analyte exceeded the 20% drift specified in method 8260C, and therefore the reported result should be considered an estimate. The overall performance of the calibration verification standard met the acceptance criteria of the method. Z - ND - Not Detected at PQL PQL - Practical Quantitation Limit RPD - Relative Percent Difference OnSite Environmental, Inc NE 95 th Street, Redmond, WA (425) This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed.

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57 14648 NE 95 th Street, Redmond, WA (425) February 25, 2016 Gregg Middaugh PBS Engineering & Environmental 2517 Eastlake Avenue E., Suite 100 Seattle, WA Re: Analytical Data for Project Laboratory Reference No Dear Gregg: Enclosed are the analytical results and associated quality control data for samples submitted on February 24, The standard policy of OnSite Environmental, Inc. is to store your samples for 30 days from the date of receipt. If you require longer storage, please contact the laboratory. We appreciate the opportunity to be of service to you on this project. If you have any questions concerning the data, or need additional information, please feel free to call me. Sincerely, David Baumeister Project Manager Enclosures OnSite Environmental, Inc NE 95 th Street, Redmond, WA (425) This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed.

58 2 Date of Report: February 25, 2016 Samples Submitted: February 24, 2016 Laboratory Reference: Project: Case Narrative Samples were received by the laboratory on February 24, They were maintained at the laboratory at a temperature of 2 o C to 6 o C. Please note that any and all soil sample results are reported on a dry-weight basis, unless otherwise noted below. General QA/QC issues associated with the analytical data enclosed in this laboratory report will be indicated with a reference to a comment or explanation on the Data Qualifier page. More complex and involved QA/QC issues will be discussed in detail below. OnSite Environmental, Inc NE 95 th Street, Redmond, WA (425) This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed.

59 3 Date of Report: February 25, 2016 Samples Submitted: February 24, 2016 Laboratory Reference: Project: DRINKING WATER LEAD EPA Matrix: Units: Water ug/l (ppb) Date Date Analyte Result PQL EPA Method Prepared Analyzed Flags Lab ID: Client ID: SVEC-146-S Lead OnSite Environmental, Inc NE 95 th Street, Redmond, WA (425) This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed.

60 4 Date of Report: February 25, 2016 Samples Submitted: February 24, 2016 Laboratory Reference: Project: DRINKING WATER LEAD EPA METHOD BLANK QUALITY CONTROL Date Analyzed: Matrix: Units: Water ug/l (ppb) Lab ID: MB0225DW1 Analyte Method Result PQL Lead ND 5.0 OnSite Environmental, Inc NE 95 th Street, Redmond, WA (425) This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed.

61 5 Date of Report: February 25, 2016 Samples Submitted: February 24, 2016 Laboratory Reference: Project: DRINKING WATER LEAD EPA DUPLICATE QUALITY CONTROL Date Analyzed: Matrix: Units: Water ug/l (ppb) Lab ID: Sample Duplicate Analyte Result Result RPD PQL Flags Lead OnSite Environmental, Inc NE 95 th Street, Redmond, WA (425) This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed.

62 6 Date of Report: February 25, 2016 Samples Submitted: February 24, 2016 Laboratory Reference: Project: DRINKING WATER LEAD EPA MS/MSD QUALITY CONTROL Date Analyzed: Matrix: Units: Water ug/l (ppb) Lab ID: Spike Percent Percent Analyte Level MS Recovery MSD Recovery RPD Flags Lead OnSite Environmental, Inc NE 95 th Street, Redmond, WA (425) This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed.

63 7 Data Qualifiers and Abbreviations A - Due to a high sample concentration, the amount spiked is insufficient for meaningful MS/MSD recovery data. B - The analyte indicated was also found in the blank sample. C - The duplicate RPD is outside control limits due to high result variability when analyte concentrations are within five times the quantitation limit. E - The value reported exceeds the quantitation range and is an estimate. F - Surrogate recovery data is not available due to the high concentration of coeluting target compounds. H - The analyte indicated is a common laboratory solvent and may have been introduced during sample preparation, and be impacting the sample result. I - Compound recovery is outside of the control limits. J - The value reported was below the practical quantitation limit. The value is an estimate. K - Sample duplicate RPD is outside control limits due to sample inhomogeneity. The sample was re-extracted and re-analyzed with similar results. L - The RPD is outside of the control limits. M - Hydrocarbons in the gasoline range are impacting the diesel range result. M1 - Hydrocarbons in the gasoline range (toluene-napthalene) are present in the sample. N - Hydrocarbons in the lube oil range are impacting the diesel range result. N1 - Hydrocarbons in diesel range are impacting lube oil range results. O - Hydrocarbons indicative of heavier fuels are present in the sample and are impacting the gasoline result. P - The RPD of the detected concentrations between the two columns is greater than 40. Q - Surrogate recovery is outside of the control limits. S - Surrogate recovery data is not available due to the necessary dilution of the sample. T - The sample chromatogram is not similar to a typical. U - The analyte was analyzed for, but was not detected above the reported sample quantitation limit. U1 - The practical quantitation limit is elevated due to interferences present in the sample. V - Matrix Spike/Matrix Spike Duplicate recoveries are outside control limits due to matrix effects. W - Matrix Spike/Matrix Spike Duplicate RPD are outside control limits due to matrix effects. X - Sample extract treated with a mercury cleanup procedure. X1- Sample extract treated with a Sulfuric acid/silica gel cleanup procedure. Y - The calibration verification for this analyte exceeded the 20% drift specified in method 8260C, and therefore the reported result should be considered an estimate. The overall performance of the calibration verification standard met the acceptance criteria of the method. Z - ND - Not Detected at PQL PQL - Practical Quantitation Limit RPD - Relative Percent Difference OnSite Environmental, Inc NE 95 th Street, Redmond, WA (425) This report pertains to the samples analyzed in accordance with the chain of custody, and is intended only for the use of the individual or company to whom it is addressed.

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65 Attachment 2 DATA TABLE

66 Sky Valley Educational Center Lead and Copper in Drinking Water Testing Program Results of Water Quality Testing Date of Sampling: February 2016 Sample ID Number Location in School Lead Concentrations (ppb) Threshold > 20 ppb Copper Concentrations (ppm) Threshold 1.3 ppm Building Room Location in Room Results Results SVEC-001-S Woodshop Left sink bank, left sink ND 0.09 SVEC-002-S Woodshop Left sink bank, middle sink ND 0.17 SVEC-003-S Woodshop Left sink bank, right sink ND 0.2 SVEC-004-S Woodshop Right sink bank, left sink ND 0.2 SVEC-005-S Woodshop Right sink bank, middle sink SVEC-006-DF Hall Hallway ND 0.08 SVEC-007-S Restroom Boy's restroom, left sink SVEC-008-S Restroom Boy's restroom, right sink SVEC-009-S Restroom Girl's restroom, left sink SVEC-010-S Restroom Girls's restroom, right sink SVEC-011-S Art room, West wall SVEC-012-S Art room, North wall ND 0.1 SVEC-013-DF South Pod East Wall ND ND SVEC-014-S South Pod East Wall ND ND SVEC-015-DF South Pod West Wall ND 0.17 SVEC-016-S South Pod West Wall ND 0.13 SVEC-017-DF East Pod South Wall ND 0.53 SVEC-018-S East Pod South Wall ND 0.56 SVEC-019-DF East Pod North Wall ND 0.47 PBS Project # Page 1

67 Sky Valley Educational Center Sample ID Number Location in School Lead Concentrations (ppb) Threshold > 20 ppb Copper Concentrations (ppm) Threshold 1.3 ppm Building Room Location in Room Results Results SVEC-020-S East Pod North Wall SVEC-021-DF North Pod South Wall ND 0.13 SVEC-022-S North Pod South Wall ND 0.09 SVEC-023-DF North Pod Room 16A ND 0.17 SVEC-024-S North Pod Room 16A ND 0.18 SVEC-025-S Gathering Sink outside coffee shop ND 0.08 SVEC-026-S Restroom Boy's restroom, left sink SVEC-027-S Restroom Boy's restroom, right sink ND 0.14 SVEC-028-S Restroom Girl's restroom, left sink SVEC-029-S Restroom Girl's restroom, right sink SVEC-030-DF Gathering DF outside coffee shop ND 0.1 SVEC-031-S Gathering Inside coffee shop ND 0.1 SVEC-032-I Gathering Inside coffee shop ND ND SVEC-033-DF Gathering Outside West entrance ND 0.3 SVEC-034-S Room A Southwest counter SVEC-035-S Room A South counter SVEC-036-S Room A East counter SVEC-037-S Room A West counter ND 0.49 SVEC-038-DF Hall Hallway outside room A ND 0.25 SVEC-039-S Room C South counter SVEC-040-S Room A/C Room A/C prep room SVEC-041-S Restroom Boy's restroom, right sink ND 0.29 PBS Project # February 2016 Page 2

68 Sky Valley Educational Center Sample ID Number Location in School Lead Concentrations (ppb) Threshold > 20 ppb Copper Concentrations (ppm) Threshold 1.3 ppm Building Room Location in Room Results Results SVEC-042-S Restroom Boy's restroom, left sink ND 0.24 SVEC-043-S Restroom Girl's restroom, right sink ND 0.27 SVEC-044-S Restroom Girl's restroom, left sink ND 0.24 SVEC-045-S Room B Prep room SVEC-046-S Room D Computer room, West wall SVEC-047-S Room D West wall ND 0.31 SVEC-048-DF Room D West wall ND 0.53 SVEC-049-S Room D Kitchen area SVEC-050-S Room D Laundry area ND 0.15 SVEC-051-S Room F Prep room SVEC-052-S Home Ec. Restroom ND 0.15 SVEC-053-S Home Ec. Outside restroom ND 0.19 SVEC-054-DF Home Ec. Outside restroom ND 0.29 SVEC-055-S Home Ec. North kitchen area ND ND SVEC-056-S Music Office SVEC-057-S Admin Server Server room SVEC-058-S Admin Mail Mail room ND 0.28 SVEC-059-S Admin Staff Staff room ND 0.24 SVEC-060-S Admin Nurse Nurse's office ND 0.25 SVEC-062-DF Locker Girl's locker room ND 0.28 SVEC-063-S Locker Girl's locker room ND 0.33 PBS Project # February 2016 Page 3

69 Sky Valley Educational Center Sample ID Number Location in School Lead Concentrations (ppb) Threshold > 20 ppb Copper Concentrations (ppm) Threshold 1.3 ppm Building Room Location in Room Results Results SVEC-064-S Locker Boy's locker room, North wall ND 0.09 SVEC-065-S Locker Boy's locker room, South wall SVEC-066-DF Locker Boy's locker room, South wall ND 0.19 SVEC-067-DF Library Library ND 0.17 SVEC-068-S Library Library SVEC-069-I Locker Boy's locker room, Training ND ND SVEC-070-CP Staff Staff room, coffee pot ND 0.36 Confirmation Sampling Confirmation Sample ID Number Location in School Lead Concentrations (ppb) Threshold > 20 ppb Copper Concentrations (ppm) Threshold 1.3 ppm Building Room Location in Room Results Results SVEC-146-S Room D Computer room, West wall Sample locations (building and room identification numbers) correspond to the attached drawing. *Results are for lead concentrations in parts per billion (ppb) or copper concentrations in parts per million (ppm) measured in the first 250 ml of water collected from a fixture that has remained static for 8 and 18 hours. **EPA has established a threshold to ensure that sources of lead contamination in drinking water are identified. If laboratory analysis reveals concentrations of lead greater than 20 ppb or copper greater than or equal to 1.3 ppm, EPA recommends assessment of the building s drinking water system and follow-up sampling to pinpoint the source of contamination. For a summary of sampling and remedial activities for fixtures that have failed to meet EPA criteria see the attached sheet, Summary of Remedial Activities at Sampling Sites that Did Not Meet Criteria for each facility. ND means: non detect " - " means: not sampled Sample Identification Coding SVEC (Sky Valley Educational Center) is the school site designation ### is the sample number S is for sink (water source) DF is for drinking fountain (water source) I is for ice machine (water source) PBS Project # February 2016 Page 4

70 Attachment 3 DRAWINGS

71 L:\Projects\41000\41373 MonroeSD\Drinking Water Testing\DWG\ _Drinking Water.dwg Apr 04, :00am justind SVEC-058-S-2016 SVEC-059-S-2016 SVEC-070-CP-2016 STAFF RECEPTION SVEC-057-S-2016 BUILDING 1 - OFFICE NONE NURSE SVEC-060-S-2016 SAMPLE IDENTIFICATION CODING SVEC SKY VALLEY EDUCATION CENTER ### SAMPLE NUMBER (2016) SAMPLING YEAR 2016 WATER SOURCES (IF PRESENT) S SINK DF DRINKING FOUNTAIN I ICE MACHINE CP COFFEE POT KEY PLAN LOCATION PLAN PROJECT: FIGURE: SAMPLE PHASE: 0003 TASK: 001 SVEC1 BUILDING 1 - ADMIN DRINKING WATER TESTING PROGRAM SKY VALLEY EDUCATION CENTER MONROE, WASHINGTON

72 SAMPLE IDENTIFICATION CODING SVEC-037-S-2016 SVEC ### (2016) SKY VALLEY EDUCATION CENTER SAMPLE NUMBER SAMPLING YEAR 2016 SVEC-036-S-2016 SVEC-035-S-2016 RM A RM B WATER SOURCES (IF PRESENT) S SINK SVEC-034-S-2016 DF I DRINKING FOUNTAIN ICE MACHINE SVEC-038-DF-2016 SVEC-045-S-2016 SVEC-044-S-2016 SVEC-043-S-2016 CP COFFEE POT SVEC-040-S-2016 GIRLS BOYS L:\Projects\41000\41373 MonroeSD\Sky Valley Drinking Water Testing\DWG\ _Drinking Water.dwg Mar 01, :36pm justind SVEC-051-S-2016 RM C SVEC-039-S-2016 SVEC-050-S-2016 RM F BUILDING 2 - ANNEX NONE RM D RM D SVEC-042-S-2016 SVEC-041-S-2016 SVEC-046-S-2016 SVEC-047-S-2016 SVEC-048-DF-2016 SVEC-049-S KEY PLAN BUILDING 2 - ANNEX LOCATION PLAN PROJECT: FIGURE: DRINKING WATER TESTING PROGRAM SKY VALLEY EDUCATION CENTER MONROE, WASHINGTON SAMPLE PHASE: 0003 TASK: 001 SVEC2

73 SAMPLE IDENTIFICATION CODING SVEC ### (2016) SKY VALLEY EDUCATION CENTER SAMPLE NUMBER SAMPLING YEAR 2016 WATER SOURCES (IF PRESENT) SVEC-033-DF-2016 SMALL GYM S DF I CP SINK DRINKING FOUNTAIN ICE MACHINE COFFEE POT SVEC-063-S-2016 SVEC-062-DF-2016 SVEC-064-S-2016 SVEC-066-DF-2016 SVEC-065-S-2016 GATHERING L:\Projects\41000\41373 MonroeSD\Sky Valley Drinking Water Testing\DWG\ _Drinking Water.dwg Mar 01, :37pm justind SVEC-056-S-2016 GIRL'S LOCKER ROOM LARGE GYM MUSIC BUILDING 3 - GYMNASIUM NONE BOY'S LOCKER ROOM SVEC-026-S-2016 SVEC-027-S-2016 SVEC-029-S-2016 SVEC-028-S-2016 SVEC-032-I-2016 SVEC-031-S-2016 SVEC-055-S-2016 COFFEE SHOP CTE BOYS GIRLS SVEC-030-DF-2016 SVEC-025-S-2016 SVEC-052-S-2016 SVEC-053-S-2016 SVEC-054-DF KEY PLAN BUILDING 3 - GYMNASIUM LOCATION PLAN PROJECT: FIGURE: DRINKING WATER TESTING PROGRAM SKY VALLEY EDUCATION CENTER MONROE, WASHINGTON SAMPLE PHASE: 0003 TASK: 001 SVEC3

74 SAMPLE IDENTIFICATION CODING SVEC ### (2016) SKY VALLEY EDUCATION CENTER SAMPLE NUMBER SAMPLING YEAR 2016 WATER SOURCES (IF PRESENT) S DF I CP SINK DRINKING FOUNTAIN ICE MACHINE COFFEE POT RM 21 WOOD SHOP SVEC-001-S-2016 SVEC-002-S-2016 SVEC-003-S-2016 SVEC-004-S-2016 L:\Projects\41000\41373 MonroeSD\Sky Valley Drinking Water Testing\DWG\ _Drinking Water.dwg Mar 01, :37pm justind SVEC-007-S-2016 SVEC-008-S-2016 SVEC-009-S-2016 SVEC-010-S-2016 BOYS GIRLS RM 23 BUILDING 4 - TECHNOLOGY ED NONE SVEC-005-S-2016 SVEC-006-DF-2016 SVEC-012-S-2016 RM 22 ART ROOM SVEC-011-S KEY PLAN BUILDING 4 - TECHNOLOGY ED LOCATION PLAN PROJECT: FIGURE: DRINKING WATER TESTING PROGRAM SKY VALLEY EDUCATION CENTER MONROE, WASHINGTON SAMPLE PHASE: 0003 TASK: 001 SVEC4

75 SAMPLE IDENTIFICATION CODING SVEC SKY VALLEY EDUCATION CENTER ### SAMPLE NUMBER (2016) SAMPLING YEAR 2016 RM 11 RM 10 SVEC-018-S-2016 SVEC-017-DF-2016 WATER SOURCES (IF PRESENT) S SINK DF DRINKING FOUNTAIN I ICE MACHINE RM 12 RM 9 CP COFFEE POT EAST POD SVEC-019-DF-2016 SVEC-020-S-2016 RM 13 RM 8 SVEC-013-DF-2016 L:\Projects\41000\41373 MonroeSD\Sky Valley Drinking Water Testing\DWG\ _Drinking Water.dwg Mar 01, :38pm justind SVEC-024-S-2016 SVEC-023-DF-2016 GIRLS BOYS RM 16 RM 17 RM 15 RM 14 NORTH POD RM 18 RM 19 RM 20 SVEC-067-DF-2016 SVEC-068-S-2016 SVEC-021-DF-2016 SVEC-022-S-2016 BUILDING 5 - PODS / LIBRARY NONE SVEC-016-S-2016 SVEC-015-DF-2016 RM 1 RM 7 RM 6 SOUTH POD RM 2 RM 3 RM 5 RM 4 GIRLS BOYS SVEC-014-S KEY PLAN BUILDING 5 - PODS / LIBRARY LOCATION PLAN PROJECT: FIGURE: DRINKING WATER TESTING PROGRAM SKY VALLEY EDUCATION CENTER MONROE, WASHINGTON SAMPLE PHASE: 0003 TASK: 001 SVEC5

76 Attachment 4 LABORATORY CERTIFICATIONS

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80 Attachment 5 WASHINGTON STATE DEPARTMENT OF HEALTH FACT SHEETS

81 Fact Sheet Lead in Drinking Water Dec DOH (Revised) How Lead Gets Into Water Lead in drinking water usually comes from water distribution lines or household plumbing rather than lakes, wells or streams. Lead from other sources, such as ingesting old-paint chips or dust, can add to the effects of lead in water. Health Issues Because the nervous and circulatory systems in young children are not fully developed, lead and other toxic substances can easily enter the brain. Long-term exposure to even low levels of lead can cause irreversible learning difficulties, mental retardation, and delayed neurological and physical development. Infants and children up to age 6 are most susceptible to these toxic effects. Pregnant women exposed to lead can pass the effects to their unborn child. Exposure for adults primarily affects the nervous system. It can impair hearing, vision, and muscle coordination. Lead is also toxic to the blood, kidney, heart, and reproductive system. Lead poisoning is a particular problem because there may be no unique signs or symptoms associated with lead exposure. Early symptoms of lead poisoning may include loss of appetite, fatigue, irritability, anemia and, sometimes, abdominal pain. Because of the general nature of symptoms at this stage, lead poisoning is not often suspected. Measuring Lead in Drinking Water Lead may be present in your home drinking water if: There are lead pipes, brass fixtures, or lead connectors in your home or community water system. Lead solder was used on your home water pipes. You have soft water (low mineral content), or acidic water. The only way to know the amount of lead in your household water is to have your water tested. Many certified labs in Washington perform these tests for $20 to $40 per test. Lab staff can answer questions and tell you how to collect water samples. For the name of a certified drinking water laboratory near you, call the Office of Drinking Water (see phone list on page 2).