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Home My WebLink AboutStaff Report 2604-6218CITY OF PALO ALTO CITY COUNCIL Special Meeting Monday, April 20, 2026 Council Chambers & Hybrid 5:30 PM Agenda Item AA2.Informational Update on Stanford Palo Alto Community Playing Fields (Mayfield) PFAS Testing Results New Item Added 9 7 6 6 City Council Staff Report From: City Manager Report Type: INFORMATION REPORTS Lead Department: Community Services Meeting Date: April 20, 2026 Report #:2604-6218 TITLE Informational Update on Stanford Palo Alto Community Playing Fields (Mayfield) PFAS Testing Results RECOMMENDATION This is an informational report and no City Council action is required. BACKGROUND On June 9, 20251, the City Council approved Construction Contract No. C25193640 with FieldTurf USA, Inc. in the amount of $3,064,185, along with a contingency of $306,419, for the Stanford Palo Alto Community Playing Fields Turf Replacement Project (PG-26000). At that time, staff issued a supplemental memorandum addressing the question of whether the selected synthetic turf system would be free of per- and polyfluoroalkyl substances (PFAS) and whether testing would be conducted to confirm this. The memorandum stated that “…staff have confirmed that FieldTurf manufactures synthetic turf products without intentionally- added PFAS and this is the product that will be installed at Stanford Palo Alto Playing Fields. FieldTurf will test the product after installation to verify no intentionally-added PFAS.” Staff have since consulted with the California Department of Toxic Substances Control (DTSC) and coordinated with an independent testing laboratory using a National Environmental Laboratory Accreditation Program (NELAP)-accredited laboratory to conduct testing. The specific testing methodology is known as Total Organic Fluorine (TOF) testing, and measures the total amount of organically bound fluorine in a material by subtracting inorganic fluorine from total fluorine. This includes fluorine from known and unknown PFAS, precursor compounds, and other organofluorine substances. TOF is widely recognized as a conservative 1 City Council, June 9, 2025; Agenda Item #9, SR #2506-4816, 9 7 6 6 and screening approach for evaluating the potential presence of fluorinated compounds associated with PFAS, particularly in complex materials such as synthetic turf. ANALYSIS 9 7 6 6 FISCAL/RESOURCE IMPACT STAKEHOLDER ENGAGEMENT ENVIRONMENTAL REVIEW ATTACHMENTS APPROVED BY: Memorandum To:Sara Marinelli, Josh Robinson (FieldTurf)Date: February 23, 2026 From:Catalina Restrepo, Michael Peterson, and Kim Reid Subject:Mayfield Soccer Complex Total Organic Fluorine (TOF) Results Executive Summary This memorandum summarizes the validated laboratory testing results of FieldTurf's product intended for Laboratory testing for PFAS compounds in synthetic turf products is difficult due to the complex matrix of The TOF results for the two Mayfield Soccer Complex FieldTurf product samples were 8.7 and 11 parts 1 in California and other states (TOF content limit of 100 or 50 ppm; see, e.g., California bill Sample Collection and Analysis Samples of the FieldTurf product intended for installation at the Mayfield Soccer Complex were collected 1 These regulatory limits are not specifically relevant to synthetic turf, but provide useful guidelines for comparison. In general, Field Turf_Mayfield_m022326m One Beacon Street, 17th Floor, Boston, MA 02108 | 617-395-5000 | www.gradientcorp.com Determining TOF is a way of determining total PFAS levels in a sample; however, there currently are no Table 1 FieldTurf Sample Information Sample ID Product Name Product Description Date Collected Carpet retain Synthetic turf 12/18/2025 Laboratory Report # Mayfield-1 10760348 Analytical Result Summary Pace Labs reported the analysis results in laboratory report number 10760348 (see Appendix B). Duplicate Both samples Mayfield-1 and Mayfield-2 had detected levels of total fluorine (8.7 and 11 mg/kg, Data Validation All the reported analytical data were validated according to the requirements listed in US EPA "Guidance 2 Field Turf_Mayfield_m022326m Table 2 Summary of Validated Detected Results for Organic Fluorine Analyses of the Mayfield Soccer TFa (mg/kg) DV Qualifier IFb (mg/kg)TOFc (mg/kg)Sample ID Result 8.7 11 RL 4 4 Result N/A – Result ND N/A – Result ND DV Qualifierd RL 10 10 Mayfield-1 Mayfield-2 Notes: –U 8.7 CIC = Combustion Ion Chromatography; DV = Data Validation; IF = Inorganic Fluoride; N/A = Not Applicable; ND = Not Detected; U = Not-detected. (a) Solid media analysis. Extraction method: cryomilling. Analysis method: TF by CIC. IF Concentration. (d) Appendix C contains a full list of the DV qualifiers, including for detected and non-detected values. Conclusion PFAS are widespread in the environment and in commercial products. Historically, PFAS have been used Because there is currently no analytical method for measuring TOF in solid media, we derived the TOF e.g., BVCPS [2025]). California Overall, these results are not indicative of the presence of intentionally added PFAS compounds in the 3 Field Turf_Mayfield_m022326m References Bureau Veritas Consumer Products Services, Inc. (BVCPS). 2025. "California Proposition 65 Settlements." California, State Assembly. 2024. "Assembly Bill No. 347: An act to amend Section 108945 of, to add US EPA. 2002. "Guidance on Environmental Data Verification and Data Validation (Final)." Office of Vermont, General Assembly. 2024. "An act relating to regulating consumer products containing 4 Field Turf_Mayfield_m022326m Appendix A FieldTurf Confirmation Letter Field Turf_Mayfield_m022326m December 2, 2025 Ben Heistein Assistant Director - Open Space, Parks, and Golf Mayfield Soccer Complex Subject: Confirmation of No Intentionally added PFAS Mr. Heistein, We are writing to confirm that our turf product, FTVTP2-RE3-39-PFF-FS-STND, does not contain At FieldTurf, we are committed to transparency, environmental stewardship, and the safety of the If you have any questions or would like to review the supporting documentation, please do not Sincerely, Darren Gill Executive Vice-President FieldTurf Tel (800) 724-2969 www.fieldturf.com Appendix B Laboratory Report Field Turf_Mayfield_m022326m Pace Analytical Services, LLC 1700 Elm Street Minneapolis, MN 55414 January 14, 2026 Catalina Restrepo Gradient Corporation RE:Project: 223101 Field Turf (9) Mayfield Dear Catalina Restrepo: Enclosed are the analytical results for sample(s) received by the laboratory on December 22, 2025. The results relate only to the The test results provided in this final report were generated by each of the following laboratories within the Pace Network: Sincerely, Carolynne Trout carolynne.trout@pacelabs.com Project Manager Enclosures cc:Michael Peterson, Gradiant Corporation REPORT OF LABORATORY ANALYSIS This report shall not be reproduced, except in full, without the written consent of Pace Analytical Services, LLC. 1 of 6 10760348 Sections:Table of Contents -2- Section 1: Sample Summary ............................................................................................................. 3 Chain of Custody .................................................................................................................... 4 2 of 6 10760348 Pace Analytical Services, LLC 1700 Elm Street Minneapolis, MN 55414 SAMPLE SUMMARY Project:223101 Field Turf (9) Mayfield Lab ID Sample ID Matrix Date Collected Date Received 10760348001 Mayfield-1 Solid 12/18/25 02:02 12/22/25 10:15 REPORT OF LABORATORY ANALYSIS This report shall not be reproduced, except in full, without the written consent of Pace Analytical Services, LLC.Date: 01/14/2026 04:30 PM 3 of 6 10760348 Carolynne Trout 12/23/25 5 of 6 10760348 6 of 6 10760348 C*%& 5.*DE'F%*D !&#GF%&+3 ,,H ? )*+' ,-./0&*1-23 4* 39 !"#$%& !'#&&' ( )*+' ,-./0&*1-23 45 67689 ( :5; <73=>8>?@<6> ( A),B <73=>8>?8338 Ja !a"#$%&$'(')$$$$$$$ 73 - a>+,3?&$78$@@A9A 0"+B-1/$4+1a/3+ C$''D9(9$E3- ,F$.!"G$H/a?I%J 4a5+"a/+"#$L+"I$M"F-"$8!<5-"C$')2(9%: ; 1,+?-F$a"-$"-?!,/?$+G$a a,#?-?$G+"$?a<>,-?$a?$"-1-3N-F$5#$/O-$,a5+"a/+"#$+ $Ja !a"#$K&$'(')P$QG$#+!$OaN-$a #$R!-?/3+ ?$ =3 1-"-,#& T-5-11a$Ea!?/ Table of Contents Sample Summary 3 Case Narrative Sample Results 5 26A0197-01 5 26A0197-02 6 Sample Preparation Information 7 8 Fluorine by Combustion Ion Chromatography (CIC)8 8 Flag/Qualifier Summary 9 10 Chain of Custody/Sample Receipt C*%& 5.*DE'F%*D !&#GF%&+3 ,,H ? )*+' ,-./0&*1-23 4* 39 !"#$%& !'#&&' ( )*+' ,-./0&*1-23 45 67689 ( :5; <73=>8>?@<6> ( A),B <73=>8>?8338 0a1-$2 a,#/31a,$4a5+"a/+"#$6$78 T;0MT.$U2.;C 9Z%Z'(') 73 -a>+,3?&$78$@@A9A 0\T*]2=;$MTU;T$8\7^;TC 9(:)(DAK 2..8C$*a"+,# -$."+!/ 0TMJ;*.$8\7^;TC 9(:)(DAK ANA !"#$A %&'((A)! LMTX$MTU;T$8\7^;TC ')2(9%: .O-$"-?!,/?$+G$a a,#?-?$>-"G+"<-F$+ $/O-$G+,,+[3 S$?a<>,-?$?!5<3//-F$/+$0a1-$2 a,#/31a,$=-"N31-?&$44*$6$;a?/$4+ S<-aF+[&$7a&$a"-$G+! F$3 $/O3?$"->+"/P 0TMJ;*.$4M*2.QM8C ''D9(9$E3-,F$.!"G$H/a?I%J EQ;4U$=2704;$_42^$QUC 72.TQ`=2704;$U;=*TQ0.QM8 .;=.=\^$42^ 7a#G3-,F69 ')2(9%:6(9 0"+F!1/Z=+,3F .+/a,$E,!+"3 -$5#$*Q* C*%& 5.*DE'F%*D !&#GF%&+3 ,,H ? )*+' ,-./0&*1-23 4* 39 !"#$%& !'#&&' ( )*+' ,-./0&*1-23 45 67689 ( :5; <73=>8>?@<6> ( A),B <73=>8>?8338 $A&*%NA))A"#+*%&'((A)! 2,,$"->+"/-F$"-?!,/?$a"-$[3/O3 $F-G3 -F$,a5+"a/+"#$R!a,3/#$1+ /"+,$+5B-1/3N-?$! ,-??$,3?/-F$5-,+[$+"$+/O-"[3?-$R!a,3G3-F$3 $/O3?$"->+"/P .O-$"-?!,/?$+G$a a,#?-?$"->+"/-F$+ ,#$"-,a/-$/+$?a<>,-?$?!5<3//-F$/+$0a1-$2 a,#/31a,$=-"N31-?&$44*$6$;a?/$4+ S<-aF+[&$7a&$G+"$/-?/3 SP 43?a$2P$L+"/O3 S/+ .-1O 31a,$T->"-?- /a/3N- C*%& 5.*DE'F%*D !&#GF%&+3 ,,H ? )*+' ,-./0&*1-23 4* 39 !"#$%& !'#&&' ( )*+' ,-./0&*1-23 45 67689 ( :5; <73=>8>?@<6> ( A),B <73=>8>?8338 0"+B-1/$4+1a/3+ C$$''D9(9$E3- ,F$.!"G$H/a?I%J =a<>,-$U-?1"3>/3+ C L+"I$M"F-"C$$$')2(9%: Ua/-$T-1-3N-FC$$9ZKZ'(') :;0/<%&,-./0%=2%%(,>?;0/<96 =a<>,-FC$$9'Z9KZ'('@$$('C(' &,-./0%#12%%34A5678956 =a<>,-$7a/"3bC$$0"+F!1/Z=+,3F :/DEJ;@0%L>%$E-LDAB;E@%#E@%$KJE- ,BEFJ,.K>%M$#$N 1,B0 1,B0G";-0 A@,/>B0 )0AD/BA ) '@;BA 1;/DB;E@ :/,FGHD,/(0BKE<IJ0.,J0<A@,/>AB .+/a,$E,!+"3 -$H.EJ KP:AP(<SZXS 9 .+/a,$E,!+"3 -$5#$*Q*9ZKZ')9ZKZ')$'(C'(77] C*%& 5.*DE'F%*D !&#GF%&+3 ,,H ? )*+' ,-./0&*1-23 4* 39 !"#$%& !'#&&' ( )*+' ,-./0&*1-23 45 67689 ( :5; <73=>8>?@<6> ( A),B <73=>8>?8338 0"+B-1/$4+1a/3+ C$$''D9(9$E3- ,F$.!"G$H/a?I%J =a<>,-$U-?1"3>/3+ C L+"I$M"F-"C$$$')2(9%: Ua/-$T-1-3N-FC$$9ZKZ'(') :;0/<%&,-./0%=2%%(,>?;0/<93 =a<>,-FC$$9'Z9KZ'('@$$('C9K &,-./0%#12%%34A5678953 =a<>,-$7a/"3bC$$0"+F!1/Z=+,3F :/DEJ;@0%L>%$E-LDAB;E@%#E@%$KJE- ,BEFJ,.K>%M$#$N 1,B0 1,B0G";-0 A@,/>B0 )0AD/BA ) '@;BA 1;/DB;E@ :/,FGHD,/(0BKE<IJ0.,J0<A@,/>AB .+/a,$E,!+"3 -$H.EJ 99 AP(<SZXS 9 .+/a,$E,!+"3 -$5#$*Q*9ZKZ')9ZKZ')$'(CA9 77] C*%& 5.*DE'F%*D !&#GF%&+3 ,,H ? )*+' ,-./0&*1-23 4* 39 !"#$%& !'#&&' ( )*+' ,-./0&*1-23 45 67689 ( :5; <73=>8>?@<6> ( A),B <73=>8>?8338 &,-./0%*OBJ,PB;E@%1,B, IJ0.%(0BKE<2*IA%6436%M":N%%%%%%%%A@,/>B;P,/%(0BKE<2"EB,/%:/D EJ;@0%L>%$#$ ,L%ND-L0J%Q:;0/<%#1R S,BPK #@;B;,/%Q-FR :;@,/%QSE,BR 1,B0 ')2(9%:6(9$V7a#G3-,F69Y ^A'(A%:@(P)9P(((9Z(KZ') C*%& 5.*DE'F%*D !&#GF%&+3 ,,H ? )*+' ,-./0&*1-23 4* 39 !"#$%& !'#&&' ( )*+' ,-./0&*1-23 45 67689 ( :5; <73=>8>?@<6> ( A),B <73=>8>?8338 H'A #"!%$TN")T :/DEJ;@0%L>%$E-LDAB;E@%#E@%$KJE- ,BEFJ,.K>%M$#$N%9%HD,/;B>%$E@BJE/ T->+"/3 S =>3I-=+!"1-cT;*T0U $2 a,#/-T-?!,/\ 3/?cT;*T0U 43<3/8+/-?$ S,BPK%SU35U78%9%*IA%6436% M":N S/,@V%MSU35U789S W6N% 0"->a"-F$d$2 a,#e-FC$(9Z(KZ')$ 8U DAPD D:P: D:P) D)P@ AP(<SZXS $&%MSU35U789S&6N %D)PKA %DP9 :(69D( $&%MSU35U789S&3N % 0"->a"-F$d$2 a,#e-FC$(9Z(KZ')$ 9(D $&%MSU35U789S&XN % 0"->a"-F$d$2 a,#e-FC$(9Z(KZ')$ 9(D $&%1D.%MSU35U789S&16N % 0"->a"-F$d$2 a,#e-FC$(9Z(KZ')$ 9(9 )PD@ C*%& 5.*DE'F%*D !&#GF%&+3 ,,H ? )*+' ,-./0&*1-23 4* 39 !"#$%& !'#&&' ( )*+' ,-./0&*1-23 45 67689 ( :5; <73=>8>?@<6> ( A),B <73=>8>?8338 : AYGH'A #:#*)%&'((A)! g f*$"-?!,/$3?$+!/?3F-$+G$-?/a5,3?O- F$,3<3/?PL3F-$"-1+N-"#$,3<3/?$-?/a5,3?O- F$G+"$F3GG31!,/$1+<>+! FPi _Ua/a$-b1--F-F$1,3- /$"-1+<<- F-F$+"$"-S!,a/+"#$,-N-,$ 8U T4 T->+"/3 S$43<3/$3?$a/$/O-$,-N-,$+G$R!a /3/a/3+ $H4MfJ 7*4 0-"1- /$"-1+N-"3-?$a F$"-,a/3N-$>-"1- /$F3GG-"- 1-?$HT0U?J$a"-$F-/-"<3 -F$5#$/O-$?+G/[a"-$!?3 S$Na,!- ?$3 $/O-$ 8+$"-?!,/?$OaN-$5-- $5,a I$?!5/"a1/-F$! ,-??$?>-13G3-F$3 $/O-$1a?-$ a""a/3N-$?- 1/3+ P C*%& 5.*DE'F%*D !&#GF%&+3 ,,H ? )*+' ,-./0&*1-23 4* 39 !"#$%& !'#&&' ( )*+' ,-./0&*1-23 45 67689 ( :5; <73=>8>?@<6> ( A),B <73=>8>?8338 $*)"#:#$A"#TN& $0JB;?;0<%A@,/>A0A%;@P/D<0<%;@%BK; A%)0.EJB A@,/>B0 $0JB;?;P,B;E@A NE%P0JB;?;0<%A@,/>A0A%;@P/D<0<%;@%B K;A%)0.EJB 0a1-$2 a,#/31a,$=-"N31-?&$44*$6$;a?/$4+ S<-aF+[&$7a&$+>-"a/-?$! F-"$/O-$G+,,+[3 S$1-"/3G31a/3+ ?$a F$a11"- F3/a/3+ ?C *+F-U-?1"3>/3+ 8!<5-";b>3"-? Serial_No:01142612:02 ANALYTICAL REPORT Lab Number:L2601022 Pace Analytical Minnesota Minneapolis, MN 55414 ATTN:Carolynne Trout Project Name:223101 FIELD TURF (TASK 9) 01/14/26 The original project report/data package is held by Pace Analytical Services. This report/data package is paginated and should be reproduced only Certifications & Approvals: MA (M-MA086), NH NELAP (2064), CT (PH-0826), IL (200077), IN (C-MA-03), KY (KY98045), ME (MA00086), MD (348), Eight Walkup Drive, Westborough, MA 01581-1019 Page 1 of 22 Serial_No:01142612:02 Project Name:223101 FIELD TURF (TASK 9)Lab Number:L2601022 Project Number:Report Date: Lab Sample Collection Receive DateClient ID Matrix L2601022-01 MAYFIELD-1 SOLID MN 12/18/25 14:02 01/08/26 L2601022-02 MAYFIELD-2 SOLID 01/08/26 Page 2 of 22 Serial_No:01142612:02 Project Name:223101 FIELD TURF (TASK 9)Lab Number:L2601022 Project Number: 10760348 Case Narrative The samples were received in accordance with the Chain of Custody and no significant deviations were encountered during the preparation Results contained within this report relate only to the samples submitted under this Pace Lab Number and meet NELAP requirements for all When multiple Batch Quality Control elements are reported (e.g. more than one LCS), the associated samples for each element are noted in Soil/sediments and solids are reported on a dry weight basis unless otherwise noted. Tissues are reported "as received" or on a wet weight HOLD POLICY - For samples submitted on hold, Pace's policy is to hold samples (with the exception of Air canisters) free of charge for 21 Please contact Project Management at 800-624-9220 with any questions. Page 3 of 22 Serial_No:01142612:02 Project Name:223101 FIELD TURF (TASK 9)Lab Number:L2601022 Project Number: 10760348 Case Narrative (continued) Report Submission The laboratory does not hold certification for the analysis of Fluoride in the state of California. I, the undersigned, attest under the pains and penalties of perjury that, to the best of my knowledge and Authorized Signature: Title: Technical Director/Representative Date: 01/14/26 Page 4 of 22 Serial_No:01142612:02 INORGANICS & MISCELLANEOUS Page 5 of 22 Serial_No:01142612:02 Project Name:Lab Number:223101 FIELD TURF (TASK 9)L2601022 Project Number:Report Date: SAMPLE RESULTS Lab ID:L2601022-01 Date Collected:12/18/25 14:02 Sample Depth: Matrix:Solid Dilution Date Prepared Date Analyzed Analytical Parameter Result Qualifier Units RL MDL Analyst General Chemistry - Westborough Lab Fluoride ND mg/kg 10 --1 01/11/26 03:01 01/11/26 07:18 121,4500F-BC DTH Page 6 of 22 Serial_No:01142612:02 Project Name:Lab Number:223101 FIELD TURF (TASK 9)L2601022 Project Number:Report Date: SAMPLE RESULTS Lab ID:L2601022-02 Date Collected:12/18/25 14:18 Sample Depth: Matrix:Solid Dilution Date Prepared Date Analyzed Analytical Parameter Result Qualifier Units RL MDL Analyst General Chemistry - Westborough Lab Fluoride ND mg/kg 10 --1 01/11/26 03:01 01/11/26 07:18 121,4500F-BC DTH Page 7 of 22 Serial_No:01142612:02 Project Name:223101 FIELD TURF (TASK 9)Lab Number:L2601022 Project Number: 10760348 Method Blank Analysis Batch Quality Control Dilution Date Date Analytical Parameter Result Qualifier Units RL MDL Factor Prepared Analyzed Method Analyst General Chemistry - Westborough Lab for sample(s): 01-02 Batch: WG2163790-1 Fluoride ND mg/kg 10 --1 01/11/26 03:01 01/11/26 07:18 121,4500F-BC DTH Page 8 of 22 Serial_No:01142612:02 Lab Control Sample Analysis Batch Quality ControlProject Name:223101 FIELD TURF (TASK 9)Lab Number:L2601022 Project Number: 10760348 LCS LCSD %Recovery Parameter %Recovery Qual %Recovery Qual Limits RPD Qual RPD Limits General Chemistry - Westborough Lab Associated sample(s): 01-02 Batch: WG2163790-2 Fluoride 95 -80-120 - Page 9 of 22 Serial_No:01142612:02 Matrix Spike Analysis Batch Quality ControlProject Name:223101 FIELD TURF (TASK 9)Lab Number:L2601022 Project Number:Report Date: Native Sample MS Added MS MS MSD Found RPD Limits RPD Qual MSD %Recovery Qual RecoveryFound %RecoveryParameter Qual General Chemistry - Westborough Lab Associated sample(s): 01-02 QC Batch ID: WG2163790-4 QC Sample: L2601020-01 Client ID: MS Sample Fluoride ND 99.7 40 40 Q --70-130 - Page 10 of 22 Serial_No:01142612:02 Lab Duplicate Analysis Project Name:223101 FIELD TURF (TASK 9)Batch Quality Control Lab Number:L2601022 Project Number: 10760348 Report Date: Parameter Native Sample Duplicate Sample Units RPD Qual RPD Limits General Chemistry - Westborough Lab Associated sample(s): 01-02 QC Batch ID: WG2163790-3 QC Sample: L2601020-01 Client ID: DUP Sample Fluoride ND ND mg/kg NC 20 Page 11 of 22 Serial_No:01142612:02 Lab Number: L2601022 Report Date: 01/14/26 Project Name:223101 FIELD TURF (TASK 9) Project Number: 10760348 Sample Receipt and Container Information YESWere project specific reporting limits specified? Cooler Information Custody SealCooler A Absent Container Information Final Temp FrozenInitial Cooler pHContainer ID Container Type deg C Pres Seal Analysis(*) L2601022-01A Plastic 120ml unpreserved NA NA Y Absent F-4500(28),TS100() Page 12 of 22 *Values in parentheses indicate holding time in days Serial_No:01142612:02 Project Name:223101 FIELD TURF (TASK 9)Lab Number:L2601022 Project Number: 10760348 GLOSSARY Acronyms DL - Detection Limit: This value represents the level to which target analyte concentrations are reported as estimated values, when EDL - Estimated Detection Limit: This value represents the level to which target analyte concentrations are reported as estimated EMPC - Estimated Maximum Possible Concentration: The concentration that results from the signal present at the retention time of an EPA - Environmental Protection Agency. - Laboratory Control Sample: A sample matrix, free from the analytes of interest, spiked with verified known amounts of LCSD - Laboratory Control Sample Duplicate: Refer to LCS. - Laboratory Fortified Blank: A sample matrix, free from the analytes of interest, spiked with verified known amounts of LOD - Limit of Detection: This value represents the level to which a target analyte can reliably be detected for a specific analyte in a - Limit of Quantitation: The value at which an instrument can accurately measure an analyte at a specific concentration. The LOQ includes any adjustments from dilutions, concentrations or moisture content, where applicable. (DoD report formats Limit of Quantitation: The value at which an instrument can accurately measure an analyte at a specific concentration. The MDL - Method Detection Limit: This value represents the level to which target analyte concentrations are reported as estimated MSD - Matrix Spike Sample Duplicate: Refer to MS. - Not Applicable. NC - Not Calculated: Term is utilized when one or more of the results utilized in the calculation are non-detect at the parameter's NDPA/DPA - N-Nitrosodiphenylamine/Diphenylamine. NI - Not Ignitable. NP - Non-Plastic: Term is utilized for the analysis of Atterberg Limits in soil. - No Results: Term is utilized when 'No Target Compounds Requested' is reported for the analysis of Volatile or Semivolatile RL - Reporting Limit: The value at which an instrument can accurately measure an analyte at a specific concentration. The RL RPD - Relative Percent Difference: The results from matrix and/or matrix spike duplicates are primarily designed to assess the SRM - Standard Reference Material: A reference sample of a known or certified value that is of the same or similar matrix as the STLP - Semi-dynamic Tank Leaching Procedure per EPA Method 1315. - Toxic Equivalency Factors: The values assigned to each dioxin and furan to evaluate their toxicity relative to 2,3,7,8-TCDD. TEQ - Toxic Equivalent: The measure of a sample's toxicity derived by multiplying each dioxin and furan by its corresponding TEF TIC - Tentatively Identified Compound: A compound that has been identified to be present and is not part of the target compound Report Format: Data Usability Report Page 13 of 22 Serial_No:01142612:02 Project Name:223101 FIELD TURF (TASK 9)Lab Number:L2601022 Project Number: 10760348 Footnotes 1 - The reference for this analyte should be considered modified since this analyte is absent from the target analyte list of the Terms Analytical Method: Both the document from which the method originates and the analytical reference method. (Example: EPA 8260B is Chlordane: The target compound Chlordane (CAS No. 57-74-9) is reported for GC ECD analyses. Per EPA,this compound "refers to a Difference: With respect to Total Oxidizable Precursor (TOP) Assay analysis, the difference is defined as the Post-Treatment value minus the Final pH: As it pertains to Sample Receipt & Container Information section of the report, Final pH reflects pH of container determined after Frozen Date/Time: With respect to Volatile Organics in soil, Frozen Date/Time reflects the date/time at which associated Reagent Water- Gasoline Range Organics (GRO): Gasoline Range Organics (GRO) results include all chromatographic peaks eluting from Methyl tert butyl Initial pH: As it pertains to Sample Receipt & Container Information section of the report, Initial pH reflects pH of container determined upon PAH Total: With respect to Alkylated PAH analyses, the 'PAHs, Total' result is defined as the summation of results for all or a subset of the PFAS Total: With respect to PFAS analyses, the 'PFAS, Total (5)' result is defined as the summation of results for: PFHpA, PFHxS, PFOA, Total: With respect to Organic analyses, a 'Total' result is defined as the summation of results for individual isomers or Aroclors. If a 'Total' Data Qualifiers A - Spectra identified as "Aldol Condensates" are byproducts of the extraction/concentration procedures when acetone is introduced in - The analyte was detected above the reporting limit in the associated method blank. Flag only applies to associated field samples that C - Co-elution: The target analyte co-elutes with a known lab standard (i.e. surrogate, internal standards, etc.) for co-extracted analyses. - Concentration of analyte was quantified from diluted analysis. Flag only applies to field samples that have detectable concentrations E - Concentration of analyte exceeds the range of the calibration curve and/or linear range of the instrument. - The ratio of quantifier ion response to qualifier ion response falls outside of the laboratory criteria. Results are considered to be an G - The concentration may be biased high due to matrix interferences (i.e, co-elution) with non-target compound(s). The result should H - The analysis of pH was performed beyond the regulatory-required holding time of 15 minutes from the time of sample collection. - The lower value for the two columns has been reported due to obvious interference. J - Estimated value. This represents an estimated concentration for Tentatively Identified Compounds (TICs). M Report Format: Data Usability Report Page 14 of 22 Serial_No:01142612:02 Project Name:223101 FIELD TURF (TASK 9)Lab Number:L2601022 Project Number: 10760348 Data Qualifiers ND - Not detected at the reporting limit (RL) for the sample. - Presumptive evidence of compound. This represents an estimated concentration for Tentatively Identified Compounds (TICs), where P - The RPD between the results for the two columns exceeds the method-specified criteria. Q - The quality control sample exceeds the associated acceptance criteria. For DOD-related projects, LCS and/or Continuing Calibration R - Analytical results are from sample re-analysis. RE V - The surrogate associated with this target analyte has a recovery outside the QC acceptance limits. (Applicable to MassDEP DW Z - The batch matrix spike and/or duplicate associated with this target analyte has a recovery/RPD outside the QC acceptance limits. Report Format: Data Usability Report Page 15 of 22 Serial_No:01142612:02 Project Name: 10760348 223101 FIELD TURF (TASK 9)Lab Number:L2601022 REFERENCES 121 Standard Methods for the Examination of Water and Wastewater. APHA-AWWA-WEF. LIMITATION OF LIABILITIES Pace Analytical Services performs services with reasonable care and diligence normal to the analytical testing We strongly urge our clients to comply with EPA protocol regarding sample volume, preservation, cooling, Page 16 of 22 Serial_No:01142612:02 ENV-FORM-WES2-0065 v02 Certificate/Approval Program Summary Certification Information The following analytes are not included in our Primary NELAP Scope of Accreditation: PAS-WES2 Westborough Facility – 8 Walkup Dr. Westborough, MA 01581 m/p-xylene, o-xylene, Naphthalene alpha-Terpineol NPW: 1,2,4,5-Tetramethylbenzene; 4-Ethyltoluene; SCM: Iodomethane (methyl iodide), 1,2,4,5-Tetramethylbenzene; 4-Ethyltoluene. NPW: Dimethylnaphthalene,1,4-Diphenylhydrazine, alpha-Terpineol, Azobenzene; SCM: Dimethylnaphthalene,1,4-Diphenylhydrazine. : NPW: Amenable Cyanide; SCM: Total Phosphorus, TKN, NO2, NO3. PAS-MANS Mansfield Facility – 320 Forbes Blvd. Mansfield, MA 02048 TSS. EPA 3050B PAS-MAN1 Mansfield Facility – 120 Forbes Blvd. Mansfield, MA 02048 EPA TO-15: Halothane, 2,4,4-Trimethyl-2-pentene, 2,4,4-Trimethyl-1-pentene, Thiophene, 2-Methylthiophene, MADEP-APH. PAS-ELON East Longmeadow Facility – 39 Spruce Street East Longmeadow, MA 01028 1,3,5-Trichlorobenzene, m/p-Xylene, o-xylene. 1,2-Dichlorobenzene, 1,3-Dichlorobenzene, 1,4-Dichlorobenzene, N-Nitrosodiphenylamine. Alachlor, Endrin Ketone, Hexachlorobenzene. Tetrahydrofuran, 1,3,5-Trichlorobenzene; SCM: TAME, TBEE, Diethyl ether, DIPE, Tetrahydrofuran. 1,3,5-Trichlorobenzene, Freon- 113. Carbazole, 1-Methylnaphthalene, Pentachloronitrobenzene; SCM: Carbazole, 1-Methylnaphthalene. Air: Benzo(e)pyrene, 1-Methylnaphthalene, 2-Methylnaphthalene, Perylene. delta-BHC, Endosulfan I, Endosulfan II, Endosulfan Sulfate, Endrin, Endrin Aldehyde, Endrin Ketone, Hexachlorobenzene, Methoxychlor. SM4500: NPW: Amenable Cyanide; SCM: Total Phosphorus, TKN, NH3, NECi: NO2, NO3, ASTMD516. The following test method is not included in our New Jersey Secondary NELAP Scope of Accreditation: PAS-MANS Mansfield Facility – 320 Forbes Blvd. Mansfield, MA 02048 The following analytes are included in our Massachusetts DEP Scope of Accreditation: Drinking Water EPA 300.0: Chloride, Nitrate-N, Fluoride, Sulfate; EPA 353.2: Nitrate-N, Nitrite-N; SM4500NO3-F: Nitrate-N, Nitrite-N; SM4500F-C, SM4500CN-CE, THMs and VOCs; EPA 504.1: EDB, DBCP. Microbiology: SM9215B; SM9223-P/A, SM9223B-Colilert-QT,SM9222D. Non-Potable Water SM4500H,B, EPA 120.1, SM2510B, SM2540C, SM2320B, SM4500CL-E, SM4500F-BC, SM4500NH3-BH: Ammonia-N and Kjeldahl-N, EPA 350.1: LACHAT 10-107-06-1-B: Ammonia-N, EPA 351.1, SM4500NO3-F, EPA 353.2: Nitrate-N, SM4500P-E, SM4500P-B, E, SM4500SO4-E, SM5220D, EPA 410.4, SM5210B, SM5310C, SM4500CL-G, EPA 1664, EPA 420.1, SM4500-CN-CE, SM2540D, EPA 300: Chloride, Sulfate, Nitrate. EPA 624.1: Volatile Halocarbons & Aromatics, EPA 608.3: Chlordane, Toxaphene, Aldrin, alpha-BHC, beta-BHC, gamma-BHC, delta-BHC, Dieldrin, DDD, DDE, DDT, Endosulfan I, Endosulfan II, EPA 625.1: SVOC (Acid/Base/Neutral Extractables). Microbiology: SM9223B-Colilert-QT; Enterolert-QT. Qualtrax ID: 335524 Effective Date: 01/06/26 Page 1 of 2 Pace® Analytical Services, LLC (PAS) Page 17 of 22 Serial_No:01142612:02 ENV-FORM-WES2-0065 v02 Certificate/Approval Program Summary PAS-MANS Mansfield Facility – 320 Forbes Blvd. Mansfield, MA 02048 Drinking Water EPA 200.7: Al, Ba, Cd, Cr, Cu, Fe, Mn, Ni, Na, Ag, Ca, Zn. EPA 200.8: Al, Sb, As, Ba, Be, Cd, Cr, Cu, Pb, Mn, Ni, Se, Ag, TL, Zn. EPA 245.1 Hg. EPA 522, EPA 537.1. Non-Potable Water EPA 200.7: Al, Sb, As, Be, Cd, Ca, Cr, Co, Cu, Fe, Pb, Mg, Mn, Mo, Ni, K, Se, Ag, Na, Sr, TL, Ti, V, Zn. EPA 200.8: Al, Sb, As, Be, Cd, Ca, Cr, Cu, Fe, Pb, Mg, Mn, Ni, K, Se, Ag, Na, TL, Zn. EPA 245.1: Hg. EPA 245.7: Hg. SM2340B PAS-ELON East Longmeadow Facility – 39 Spruce Street East Longmeadow, MA 01028 Drinking Water EPA 300.0: NO3, NO2, Fl, Cl, SO4. NECI Reductase: NO3, NO2. SM4500F-C, SM4500Cl-B, ASTM D516, SM4500CN-C,E, EPA 180.1, SM2320B, SM 2540C, SM4500H-B, SM4500SO4-E. EPA 537.1; EPA 524.2: THMs and VOCs; EPA 504.1: EDB, DBCP. Microbiology: SM9223-P/A: TC/EC; SM9223B-Colilert-enumeration: TC/EC; HPC-Simplate. Non-Potable Water SM4500H-B, SM2510B, SM2540C, SM2320B, SM4500Cl-B, ASTMD516, SM4500NH3-B, C, EPA 350.1, NECi: NO3, SM4500NH3-B, C: TKN, Cl, SO4, NO3. Volatile Halocarbons, Volatile Aromatics. Chlordane, Toxaphene, Aldrin, Alpha-BHC, Beta-BHC, Gamma-BHC, Delta-BHC, Dieldrin, DDD, DDE, DDT, Endosulfan I, Endosulfan II, Endosulfan Sulfate, Endrin, Endrin Aldehyde, Heptachlor, Heptachlor Epoxide, PCBs. EPA 625.1: SVOC-Acid Extractables and Base/Neutrals Microbiology: SM9223B-Colilert: E. coli (Ambient and Wastewater), SM9223B-Colilert-18: Fecal Coliform (Wastewater). Certification IDs: PAS-WES2 Westborough Facility – 8 Walkup Dr. Westborough, MA 01581 CT PH-0826, IL 200077, IN C-MA-03, KY kY98045, ME MA00086, MD 348, MA M-MA086, NH 2064, NJ MA935, NY 11148, NC (DW) 25700, NC (NPW/SCM) 666, OR MA-1316, PA 68-03671, RI LAO00065, TX T104704476, VT VT-0935, VA 460195. PAS-MANS Mansfield Facility – 320 Forbes Blvd. Mansfield, MA 02048 ANAB/DoD L2474, CA 3117, CO MA00030, CT PH-0825, IL 200081, IN C-MA-04, KY KY98046, LA 85084, ME MA00030, MD 350, MA M-MA00030, PAS-MAN1 Mansfield Air Lab Facility – 120 Forbes Blvd. Mansfield, MA 02048 ANAB/DoD L2474, LA 245052, ME MA01156, MN 025-999-498, NH 2249, NJ MA025, NY 12191, OR 4203, TX T104704583, VA 460311, WA C1104. PAS-ELON East Longmeadow Facility – 39 Spruce St. East Longmeadow, MA 01028 CT PH-0821, ME MA00100, MI 9100, NC (DENR) 652, NC (DW) 25703, MA M-MA100, NH (Secondary) 2516, NH (Primary) 2557, NJ MA007, NY 10899, PA 68-05812, RI LAO00373, VA 460217, VT-255716, WV DEP 419, WV-DW 9979C, LA 05130, LA-DW LA042, MD-DW 373, OH 87781. For a complete listing of analytes and methods, please contact your Project Manager. Qualtrax ID: 335524 Effective Date: 01/06/26 Page 2 of 2 Pace® Analytical Services, LLC (PAS) Page 18 of 22 Serial_No:01142612:02 Page 19 of 22 Serial_No:01142612:02 Page 20 of 22 Serial_No:01142612:02 Page 21 of 22 Serial_No:01142612:02 Sample De live ry Group Summary Pace Job Number : L2601022 Received : 08-JAN-2026 Account Name : Pace Ana lytica l Minne s ota Delivery Information Samples De live re d By : Express S hip FedEx (424355846224) Cha in of Custody : Present Cooler Information Coole r Seal/Seal#Pre se rva tion Temperature(°C) Additiona l Informa tion A Abs e nt/ Condition Information 1) All samples on COC re ce ive d?YES 3) Are there any sample container discrepancies?NO NO YES Vo la tile Organics /VP H 1) Reagent Water Via ls Frozen by Clie nt?NA Page 22 of 22 Appendix C Data Validation Checklist: Fluorine Analysis in Solid Samples Laboratory Report No. 10760348 Field Turf_Mayfield_a022326m Project Location:Mayfield Soccer Complex, Palo Alto, CA Methods:Total Fluorine (TF) by Combustion Ion Chromatography (CIC) Laboratory:Pace Labs Report or Job ID:10760348 Data Validation Level:Level 2 Stephanie Kukolich – 1/23/2026 This Level 2 data validation checklist provides the findings of a data quality review of the laboratory The data validation review was conducted according to procedures defined in the Sampling and Analysis The following data qualifiers have been used to qualify the data, when appropriate. J+=Data result is estimated due to potential high bias. UJ = Data result is not detected above the level of the associated value. The result is X =Exclusion of data is recommended. C-1 Field Turf_Mayfield_a022326m Table C.1 Sample Summary – Laboratory Report No. 10760348 Laboratory Sample Description Date Collected Date Received Date Prepared Date AnalyzedClient Sample ID Matrix Batch # TF by CIC Mayfield-1 26A0197-01 Solid –12/18/2025 1/8/2026 1/8/2026 1/8/2026 B420497 FD of Mayfield-1 IF by Method 121,4500F-BC Mayfield-1 Mayfield-2 Notes: L2601022-01 Solid –12/18/2025 1/8/2026 1/11/2026 1/11/2026 WG2163790 FD of Mayfield-1 CIC = Combustion Ion Chromatography; FD = Field Duplicate; IF = Inorganic Fluoride; TF = Total Fluorine. C-2 Field Turf_Mayfield_a022326m Executive Summary Overall Summary of Data Usability No technical issues were noted during the data validation review. B. Technical Issues Affecting Accuracy No technical issues affecting accuracy were noted during the data validation review. C. Technical Issues Affecting Sensitivity No technical issues affecting sensitivity were noted during the data validation review. D. Completeness No technical issues affecting completeness were noted during the data validation review. E. Other Technical Issues No additional technical issues were identified during the data validation review. C-3 Field Turf_Mayfield_a022326m C.1 Total Fluorine by Combustion Ion Chromatography (CIC) C.1.1 Chain-of-Custody (COC) and Sample Documentation Completeness Review Questions Yes No N/A Sample and Analytes Affected/Comments Flag 1. Were safe storage and preservation requirements met?X If temperature >6°C, then J-flag detects, and UJ-flag nondetects. 2. Were all COC records signed, indicating that COC was maintained for all samples? 3. Were there any problems noted in the laboratory data package concerning the condition of samples upon receipt? X The laboratory noted that the sample containers 4. Were the COCs filled out correctly?X 5. Were field QC samples included?X Notes: COC = Chain of Custody; N/A = Not Applicable; QC = Quality Control. C.1.2 Sample Result Review Review Questions Yes No N/A Sample and Analytes Affected/Comments Flag 6. Was a narrative summary of QA or sample problems provided by X 7. Are the units correct?X Notes: N/A = Not Applicable; QA = Quality Assurance. C-4 Field Turf_Mayfield_a022326m C.1.3 Blanks Review Questions Yes No N/A Sample and Analytes Affected/Comments Flag 8. Was a method blank (MB) extracted with each analysis batch i.e., 1 per 20 samples, per batch, per matrix)? X X If yes, U-flag positive sample results reported at the RL, and Notes: N/A = Not Applicable; RL = Reporting Limit. C.1.4 Field Duplicates Review Questions Yes No N/A Sample and Analytes Affected/Comments Flag 10. Were field duplicates collected in association with the samples in X 11. If so, was precision deemed acceptable (i.e., <50% RPD in X Analytes with RPDs outside acceptable limits will be J-flagged ≤5X the average RL, Notes: N/A = Not Applicable; RL = Reporting Limit; RPD = Relative Percent Different. C-5 Field Turf_Mayfield_a022326m C.1.5 Laboratory Control Samples (LCSs) and Laboratory Control Sample Duplicates (LCSDs) Review Questions Yes No N/A Sample and Analytes Affected/Comments Flag 12. Were laboratory control samples (LCSs) and laboratory control X LCSs and LCSDs should be prepared per 20 samples, per batch, 13. Were LCS and LCSDs recoveries within the acceptable criteria?X If the LCS or LCSDs percentage recoveries were greater than the Note: C-6 Field Turf_Mayfield_a022326m C.2 Inorganic Fluoride by Method 121,4500F-BC C.2.1 Chain-of-Custody (COC) and Sample Documentation Completeness Review Questions Yes No N/A Sample and Analytes Affected/Comments Flag 14. Were safe storage and preservation requirements met?X If temperature >6°C, then J-flag detects, and UJ-flag nondetects. 15. Were all COC records signed, indicating that COC was maintained for all samples? 16. Were there any problems noted in the laboratory data package concerning the condition of samples upon receipt? X The laboratory noted that the sample containers 17. Were the COCs filled out correctly?X 18. Were field QC samples included?X Notes: COC = Chain of Custody; N/A = Not Applicable; QC = Quality Control. C.2.2 Sample Result Review Review Questions Yes No N/A Sample and Analytes Affected/Comments Flag 19. Was a narrative summary of QA or sample problems provided by X 20. Are the units correct?X Notes: N/A = Not Applicable; QA = Quality Assurance. C-7 Field Turf_Mayfield_a022326m C.2.3 Blanks Review Questions Yes No N/A Sample and Analytes Affected/Comments Flag 21. Was a method blank (MB) extracted with each analysis batch i.e., 1 per 20 samples, per batch, per matrix)? X X If yes, U-flag positive sample results reported at the RL, and Notes: N/A = Not Applicable; RL = Reporting Limit. C.2.4 Field Duplicates Review Questions Yes No N/A Sample and Analytes Affected/Comments Flag 23. Were field duplicates collected in association with the samples in X 24. If so, was precision deemed acceptable (i.e., <50% RPD in X Analytes with RPDs outside acceptable limits will be J-flagged ≤5X the average RL, Notes: N/A = Not Applicable; RL = Reporting Limit; RPD = Relative Percent Different. C-8 Field Turf_Mayfield_a022326m C.2.5 Laboratory Control Samples (LCSs) and Laboratory Control Sample Duplicates (LCSDs) Review Questions Yes No X N/A Sample and Analytes Affected/Comments Only one LCS was reported in the data package. Because the LCS met the recovery criteria, and all other data validation criteria were met, no actions were taken. Flag 25. Were laboratory control samples (LCSs) and laboratory control LCSs and LCSDs should be prepared per 20 samples, per batch, 26. Were LCS and LCSDs recoveries within the acceptable criteria?X If the LCS or LCSDs percentage recoveries were greater than the Note: C.2.6 Matrix Spike/Matrix Spike Duplicate (MS/MSD) Analysis Review Questions Yes No N/A Sample and Analytes Affected/Comments Flag 27. Were matrix spikes (MSs)/matrix spike duplicates (MSDs)X It appears that the reported MS was not associated with C-9 Field Turf_Mayfield_a022326m Review Questions Yes No N/A Sample and Analytes Affected/Comments Flag 28. Are the MS/MSD recoveries within the defined X If the MS or MSD percentage recoveries were greater If the MS or MSD percentage recoveries were less than ≥10%, flag detects for the 29. Was the RPD for the MS/MSD summarized?X If the RPD was above the accepted RPD criteria, flag Notes: N/A = Not Applicable; QC = Quality Control; RPD = Relative Percent Difference. C-10 Field Turf_Mayfield_a022326m References US EPA. 2002. "Guidance on Environmental Data Verification and Data Validation (Final)." Office of C-11 Field Turf_Mayfield_a022326m