ADDENDUM 1 FINAL SAMPLING AND ANALYSIS PLAN (FIELD SAMPLING PLAN/QUALITY ASSURANCE PROJECT PLAN)

ADDENDUM 1 FINAL SAMPLING AND ANALYSIS PLAN (FIELD SAMPLING PLAN/QUALITY ASSURANCE PROJECT PLAN) FOR GROUNDWATER AND LANDFILL GAS MONITORING AT IR SITE 22 LANDFILL Former Naval Air Station Moffett Field Mountain View, California ENVIRONMENTAL MULTIPLE AWARD CONTRACT (EMAC) Contract Number N68711-01-D-6005 Contract Task Order 0004 Prepared for: Base Realignment and Closure Program Management Office West 1455 Frazee Road, Suite 900 San Diego, California 92108-4310 April 2006 Prepared by: 317 E. Main Street Ventura, CA 93001-2627

Addendum 1 Final Sampling and Analysis Plan Groundwater and Landfill Gas Monitoring at IR Site 22 Landfill Former Naval Air Station, Moffett Field, Mountain View, CA Section TABLE OF CONTENTS Page 1.0 INTRODUCTION... 1 1.1 RATIONALE FOR SAMPLING... 2 1.1.1 Groundwater Monitoring... 2 1.1.2 Landfill Gas Monitoring... 3 1.2 SUPPLEMENTAL INFORMATION... 4 2.0 ELECTRONIC DATA DELIVERABLES FORMAT... 4 3.0 REFERENCES... 5 Figures 1 Location Map of Former Naval Air Station, Moffett Field, Mountain View, CA 2 Overall Site Plan Location Map of Former Naval Air Station, Moffett Field, Mountain View, CA 3 Location Map of IR Site 22 Landfill 4 Project Organization Chart Tables 1 Constituents of Concern in the Record of Decision 2 Proposed Groundwater Samples, Rationale, and Analysis 3 Summary of Groundwater Analysis 4 Key Personnel 5 Implementation Schedule for Sampling, Analysis, and Reporting Appendices A Approved EMAC Laboratories T N & Associates, Inc. ii

Addendum 1 Final Sampling and Analysis Plan Groundwater and Landfill Gas Monitoring at IR Site 22 Landfill Former Naval Air Station, Moffett Field, Mountain View, CA ACRONYMS AND ABBREVIATIONS CCR COCs CTO DHS ELAP EMAC FNAS FSP IR NAVFACSW NFESC O&M OMMP QAPP QC ROD SAP TN&A TtFW California Code of Regulations constituents of concern Contract task order Department of Health Services Environmental Laboratory Accreditation Program Environmental Multiple Award Contract Former Naval Air Station Field Sampling Plan Installation Restoration Naval Facilities Engineering Command Southwest Naval Facilities Engineering Service Center operations and maintenance Post-Construction Operations, Maintenance and Monitoring Plan Quality Assurance Project Plan Quality Control Record of Decision Sampling and Analysis T N & Associates, Inc. Tetra Tech FW, Inc. T N & Associates, Inc. iii

Addendum 1 Final Sampling and Analysis Plan Groundwater and Landfill Gas Monitoring at IR Site 22 Landfill Former Naval Air Station, Moffett Field, Mountain View, CA 1.0 INTRODUCTION T N & Associates Inc. (TN&A) has received contract task order (CTO) 0004 from the Department of the Navy, Naval Facilities Engineering Command Southwest (NAVFACSW), under the Environmental Multiple Award Contract (EMAC), Contract No. N68711-01-D-6005. Under CTO 0004, TN&A will assume continuation of ongoing groundwater and landfill gas monitoring activities at Installation Restoration (IR) Site 22 Landfill located at the Former Naval Air Station (FNAS), Moffett Field, Mountain View, CA (Figures 1 and 2). Groundwater and landfill gas monitoring activities have been conducted at IR Site 22 since November 2003 by Tetra Tech FW, Inc. (TtFW) in accordance with the long-term quarterly monitoring program described in the approved Post-Construction Operations, Maintenance, and Monitoring Plan (OMMP) prepared by TtFW in 2003 (TtFW, 2003). The Sampling and Analysis Plan for the longterm monitoring program consisted of Field Sampling Plan (FSP) dated December 27, 2002 (TtFW, 2002a) and Quality Assurance Project Plan (QAPP) dated December 27, 2002 (TtFW, 2002b). Under CTO 0004, TN&A will assume ongoing groundwater and landfill gas monitoring at IR Site 22 for 2 years, i.e., from April 2006 to April 2008. This SAP Addendum will be used in conjunction with the Navy-approved FSP (TtFW, 2002a) and QAPP (TtFW, 2002b). TN&A prepared this Sampling and Analysis Plan (SAP) Addendum to include the following: 1. Field Sampling Plan (FSP) Addendum to Final Field Sampling Plan for Installation Restoration Site 22 Landfill, Moffett Federal Airfield, Moffett Field, California, Revision 0, December 27, 2002 (TtFW, 2002a), and 2. Quality Assurance Project Plan (QAPP) Addendum to Final Quality Assurance Project Plan for Installation Restoration Site 22 Landfill, Moffett Federal Airfield, Moffett Field, California, Revision 0, November 27, 2002 (TtFW, 2002b). T N & Associates, Inc. 1

Addendum 1 Final Sampling and Analysis Plan Groundwater and Landfill Gas Monitoring at IR Site 22 Landfill Former Naval Air Station, Moffett Field, Mountain View, CA The SAP Addendum provides information on the personnel change and documents field activities to be performed by TN&A from April 2006 to April 2008 for post-construction operations and maintenance (O&M) of IR Site 22 Landfill, including groundwater monitoring and landfill gas monitoring. All monitoring activities will follow specifications of the Navy-approved FSP and QAPP prepared by TtFW in 2002. Data quality objectives are described in the Final QAPP (TtFW, 2002b). The following sections provide brief summary of monitoring activities and document project personnel changes. 1.1 RATIONALE FOR SAMPLING TN&A is contracted to provide for post-construction O&M of the IR Site 22 Landfill including groundwater and landfill gas monitoring. O&M of the landfill will be conducted in accordance with the approved OMMP (TtFW, 2003), which provides specifications for inspection, maintenance, and monitoring during the post-construction maintenance period. 1.1.1 Groundwater Monitoring Per the OMMP (TtFW, 2003), the long-term groundwater monitoring program was designed to meet the Applicable or Relevant and Appropriate Requirements (ARARs) specified in the Record of Decision (DoN, 2002). The purpose of groundwater monitoring is to assess whether a constituent release from the IR Site 22 Landfill has occurred. To meet requirements of regulations at Title 27 CCR, Section 20420, the long-term groundwater monitoring program was designed to include the following ten groundwater monitoring wells (refer to Figure 3 for well locations). Five out of ten wells are considered as downgradient wells (WGC2-1, WGC2-8, WGC2-9, WGC2-10, and WGC2-11). Four of the monitoring wells are upgradient wells (WGC2-4, WGC2-6, WGC2-12, and WGC2-13). Monitoring well WGC2-5 is a cross-gradient well. Based on the landfill history and findings during the Feasibility Study (FS), an appropriate list of constituents of concern (COCs) was developed and approved in the ROD (DoN, 2002). COCs are listed in Table 1 (TtFW, 2003). To meet monitoring requirements, quarterly groundwater sampling was started in November 2003. Quarterly monitoring is conducted at the ten monitoring wells, shown on Figure 3. Groundwater from each well is sampled for the following constituents (TtFW, 2002a): T N & Associates, Inc. 2

Addendum 1 Final Sampling and Analysis Plan Groundwater and Landfill Gas Monitoring at IR Site 22 Landfill Former Naval Air Station, Moffett Field, Mountain View, CA Volatile Organic Compounds (EPA Method 5030B/8260B), Semivolatile Organic Compounds (EPA Method 8270C), and Organochlorine Pesticides (EPA Method 8081A). Table 2 presents proposed groundwater samples, rationale, and analysis. The proposed groundwater analysis is summarized in Table 3. TN&A will continue the groundwater monitoring program for IR Site 22 for 2 years of the long-term O&M program, from April 2006 to April 2008, following the specifications of the Navy-approved FSP and QAPP prepared by TtFW in 2002. The quality control (QC) procedures as well as the field sampling procedures for this project will be focused on achieving DQOs described in Final QAPP (TtFW, 2002b) in a timely, costeffective, and safe manner. 1.1.2 Landfill Gas Monitoring Landfill gas monitoring program was designed in accordance with 27 California Code of Regulations (CCR), Section 20921(a), to demonstrate that methane gas migration is not occurring in the vadose zone (TtFW, 2003). Quarterly measurements of methane concentrations in the ambient air, tree wells, and landfill gas monitoring wells are conducted in accordance with the Navy-approved FSP (TtFW, 2002a). Methane monitoring activities coincide with groundwater monitoring. Ambient air measurements are collected every 250 feet around the landfill perimeter indicated on Figure 3 resulting in thirteen (13) measurement locations (i.e., P-1 through P-13). Landfill gas monitoring is conducted at four (4) gas monitoring wells (i.e., LGMW-1 through LGMW-4) installed outside of the landfill perimeter as indicated on Figure 3. In addition, the methane monitoring network at IR Site 22 includes fifteen (15) tree wells (TW-2, TW-5, TW-9, TW-13, TW-15, TW-19, TW-21, TW-26, TW-30, TW-38, TW-40, TW-42, TW-49, TW-52, and TW-54). Tree wells are the gas vents that will be used for landfill gas monitoring (TtFW, 2003). Methane concentrations are monitored in the field using a portable Landtec GA90 methane meter, or its equivalent, calibrated before use. Concentrations, locations, date, and time of each measurement are recorded in the filed logbook. Methane is monitored to confirm that concentrations remain below 5 percent by volume in air. Per project Data Quality Objective (TtFW, 2002b), an exceedance of this criterion will be considered verified if methane levels for an individual well are detected above 5 percent by volume for two out of three consecutive quarters. If verified methane levels measurements in air along the landfill perimeter or in landfill T N & Associates, Inc. 3

Addendum 1 Final Sampling and Analysis Plan Groundwater and Landfill Gas Monitoring at IR Site 22 Landfill Former Naval Air Station, Moffett Field, Mountain View, CA gas monitoring wells exceed 5 percent by volume, NAVFACSW and regulatory agencies will be immediately notified to determine an appropriate course of action. Per Navy-approved OMMP (TtFW, 2003), landfill gas monitoring is to be conducted quarterly for a minimum of 5 years, at which time the interval between monitoring events may be increased or monitoring may be deemed unnecessary. Quarterly landfill gas monitoring began in November 2003. TN&A will assume responsibility for gas monitoring in April 2006 and continue measuring methane concentrations for 2 years of the long-term O&M program. The QC procedures as well as the field sampling procedures for this project will be focused on achieving DQOs described in the approved QAPP (TtFW, 2002b) in a timely, cost-effective, and safe manner. 1.2 SUPPLEMENTAL INFORMATION Figure 4 shows the Project Team Organization Chart and Table 4 presents key personnel. Appendix A contains the list of laboratories determined by TN&A to be eligible to conduct analytical services for this project. Each laboratory listed in Appendix A have current evaluation by the Naval Facilities Engineering Service Center (NFESC) and are currently certified by the California Department of Health Services (DHS) Environmental Laboratory Accreditation Program (ELAP) for analysis of hazardous materials for each method specified. Implementation schedule for sampling, analysis, and reporting is summarized in Table 5. 2.0 ELECTRONIC DATA DELIVERABLES FORMAT In accordance with the Environmental Work Instructions No. 6 (NAVFACSW, 2005), electronic data deliverable (EDD) will be delivered in a format compatible with Naval Electronic Data Deliverable (NEDD). Field and analytical data collected under this CTO will be uploaded to the Naval Installation Restoration Information Solution (NIRIS) database using NEDD tables. T N & Associates, Inc. 4

Addendum 1 Final Sampling and Analysis Plan Groundwater and Landfill Gas Monitoring at IR Site 22 Landfill Former Naval Air Station, Moffett Field, Mountain View, CA 3.0 REFERENCES Department of the Navy (DON). 2002. Final Record of Decision. IR Site 22 Landfill, Moffett Federal Airfield, Moffett Field, California. June 25. Naval Facilities Engineering Command Southwest (NAVFACSW). 2005. Environmental Work Instruction #6 Environmental Data Management and Required Electronic Delivery Standards, April 19. Tetra Tech FW, Inc. (TtFW). 2002a. Final Field Sampling Plan for Installation Restoration Site 22 Landfill, Moffett Federal Airfield, Moffett Field, California. Revision 0. Contract No. N68771-98-D-5713, Contract Task Order No. 0032. December 27. TtFW. 2002b. Final Quality Assurance Project Plan for Installation Restoration Site 22 Landfill, Moffett Federal Airfield, Moffett Field, California. Revision 0. Contract No. N68771-98-D- 5713, Contract Task Order No. 0032. December 27. TtFW. 2003. Final Post-Construction Operations, Maintenance, and Monitoring Plan Addendum at Installation Restoration Site 22, Moffett Federal Airfield, Moffett Field, California. Contract No. N68711-98-D-5713, Contract Task Order No. 0032. September 16. T N & Associates, Inc. 5

Legend Primary Highway Hard Surface Secondary Highway Hard surface Interstate Route U.S. Route State Route DRAWING NO. DRAWN BY: MW CHECKED BY: NC DATE: MARCH 2005 FIGURE 1 LOCATION MAP OF FORMER NAVAL AIR STATION MOFFETT FIELD MOUNTAIN VIEW, CA OPERATIONS, MAINTENANCE, AND MONITORING FORMER NAS MOFFETT FIELD, MOUNTAIN VIEW, CA G:\arc\projects\Moffett\SAP_Regional_Location_Map.mxd

STEVENS CREEK NASA AMES RESEARCH CENTER IR SITE 22 E. PATROL ROAD 1ST AVENUE 3RD AVENUE LA AVENIDA ST. ORION PARK HOUSING AREA FORMER NAS MOFFETT FIELD 5TH AVENUE 101 WESCOAT HOUSING AREA 85 BLVD. MOFFETT TYRELLA AVENUE N. WHISMAN ROAD ELLIS ST. MACON ROAD 237 101 0 500 1,000 1,500 2,000 Legend IR Site 22 Road Runway Building Scale in Feet Water Former NAS Moffett Field NASA Ames Research Center Orion Park Housing Area Wescoat Housing Area DRAWING NO. DRAWN BY: MW CHECKED BY: JF DATE: MARCH 2006 FIGURE 2 OVERALL SITE PLAN FORMER NAVAL AIR STATION MOFFETT FIELD MOUNTAIN VIEW, CA OPERATIONS, MAINTENANCE, AND MONITORING FORMER NAS MOFFETT FIELD, MOUNTAIN VIEW, CA G:\arc\projects\Moffett\SAP_Overall_Site_Plan.mxd

US FISH AND WILDLIFE SERVICE NORTH PATROL ROAD P-9 P-10 NORTHERN CHANNEL P-11 WGC2-8 TW-2 WGC2-5 LGMW-3 WGC2-4 P-12 TW-42 P-13 WGC2-9 P-8 LGMW-4 TW-9 TW-5 IR SITE 22 TW-26 TW-40 TW-38 P-1 WGC2-12 TW-15 WGC2-10 P-7 TW-13 TW-19 TW-21 TW-30 TW-52 TW-49 LGMW-2 P-2 WGC2-6 TW-54 WGC2-11 P-6 WATER HAZARD P-5 WGC2-1 LGMW-1 P-4 P-3 WATER HAZARD WGC2-13 GOLF COURSE NORTH PATROL ROAD 0 100 200 300 400 Scale in Feet Legend Site 22 Road Building Groundwater Monitoring Well Gas Monitoring Well Perimeter Gas Monitoring Locations DRAWING NO. DRAWN BY: MW CHECKED BY: NC DATE: MARCH 2005 FIGURE 3 LOCATION MAP OF IR SITE 22 LANDFILL FORMER NAS MOFFETT FIELD MOUNTAIN VIEW, CA Water Tree Wells OPERATIONS, MAINTENANCE, AND MONITORING FORMER NAS MOFFETT FIELD, MOUNTAIN VIEW, CA G:\arc\projects\Moffett\SAP_Site_22.mxd

TABLE 1 CONSTITUENTS OF CONCERN IN THE RECORD OF DECISION IR SITE 22 LANDFILL, FNAS MOFFETT FIELD, MOUNTAIN VIEW, CALIFORNIA Compound EPA Method MDLs* (µg/l) PRRLs (µg/l) Draft CCLs ** (µg/l) PRRL< CCLs? Volatile organic Compounds 1,4-Dichlorobenzene 5030B/8260B 0.2 10 12,900 Yes Benzene 5030B/8260B 0.2 1.0 17,990 Yes Chlorobenzene 5030B/8260B 0.2 1.0 12,900 Yes Chloroform 5030B/8260B 0.2 1.0 13.64 Yes cis-1,2-dichloroethene 5030B/8260B 0.2 1.0 178.77 Yes Ethylbenzene 5030B/8260B 0.2 1.0 4,300 Yes Toluene 5030B/8260B 0.2 1.0 500,000 Yes Trichloroethene 5030B/8260B 0.2 1.0 115.15 Yes Vinyl chloride 5030B/8260B 0.2 1.0 152.22 Yes Total Xylenes 5030B/8260B 0.3 3.0 18 Yes Organochlorine Pesticides Aldrin 8081A 0.02 0.05 13 Yes Gamma BHC (Lindane) 8081A 0.02 0.05 1.6 Yes Semivolatile Organic Compounds 2-Methylnaphthalene 8270C 5.0 10 3,000 Yes 4-Methylphenol 8270C 5.0 10 130 Yes bis(2-ethylhexyl)phthalate 8270C 5.0 20 30 Yes Carbazole 8270C 5.0 10 37 Yes Dibenzofuran 8270C 5.0 10 37 Yes Diethylphthalate 8270C 5.0 20 340 Yes Fluorene 8270C 5.0 10 3,000 Yes Naphthalene 8270C 5.0 10 23,500 Yes Notes: *MDLs Results below PRRLs, but above MDLs will be reported as estimated values (flagged with J ). These results will be used for the statistical evaluation of the data to determine if there is a release from the landfill. **CCLs Constituent Concentration Limits (CCLs) were calculated by Tetra Tech EC, Inc., (TtEC, 2005), based on the conceptual model in accordance with the ROD, the OMMP, and applicable regulations (Title 27 CCR, 20400) and the Regional Water Quality Control Board Basin Plan objectives; the limit is the chronic saltwater value multiplied by the attenuation factor. Details are described in Post-Construction Draft Operation, Maintenance and Monitoring Plan Addendum (TtEC, 2005). This Addendum is currently in the process of review by regulators. MDL - Method detection limits PRRL Project-required reporting limit µg/l Micrograms per liter T N & Associates, Inc. Page 1 of 1

TABLE 4 Wilson Doctor KEY PERSONNEL IR SITE 22 LANDFILL, FNAS MOFFETT FIELD, MOUNTAIN VIEW, CALIFORNIA Name Organization Role Responsibilities Contact Information Narciso A. Ancog William Schaal, P.G., P.M.P Navy Remedial Project Manager for IR Site 22 Responsible for overall project execution and for coordination with base representatives, regulatory agencies, and Navy management Actively participates in DQO process Provides management and technical oversight during data collection Navy QA Officer Responsible for QA issues for all Navy work Provides government oversight of TN&A s QA program Reviews and approves SAP and any significant modifications Has authority to suspend project activities if Navy quality requirements are not met TN&A Project Manager Responsible for implementing all activities called out in CTO Prepares or supervises preparation of SAP and approves document Monitors and directs field activities to ensure compliance with SAP requirements Base Realignment and Closure Program Management Office West Wilson.doctor@navy.mil (619) 532-0928 Naval Facilities Engineering Command, San Diego, CA Narciso.ancog@navy.mil (619) 532-3046 TN&A, San Francisco, CA Bchaal@tnainc.com (415) 760-6624 T N & Associates, Inc. Page 1 of 3

TABLE 4 (Continued) KEY PERSONNEL IR SITE 22 LANDFILL, FNAS MOFFETT FIELD, MOUNTAIN VIEW, CALIFORNIA Name Organization Role Responsibilities Contact Information John Fleissner, P.E. Ewelina Mutkowska Richard Baldino TN&A TN&A TN&A Program QA Manager Project Chemist Database Manager Responsible for resolution of QA issues with Navy QA officer Provides program-level QA guidance to installation coordinator, project manager and project team Reviews and approves SAP Identifies nonconformances through QA review activities and recommends corrective action Responsible for defining analytical requirements and developing SAP May conduct laboratory evaluations Coordinates with laboratory project manager on analytical requirements, delivery schedules, and logistics Coordinates independent validation of laboratory data Reviews laboratory data and validation reports before release to project team Prepares and supports report preparation Responsible for developing, monitoring, and maintaining project database under guidance of project manager TN&A, Milwaukee, WI Jfleissner@tnainc.com (414) 607-6734 TN&A, Ventura, CA Emutkowska@tnainc.com (805) 585-6391 TN&A, Chicago, IL Rbaldino@tnainc.com (312) 220-7000 Page 2 of 3

TABLE 4 (Continued) KEY PERSONNEL IR SITE 22 LANDFILL, FNAS MOFFETT FIELD, MOUNTAIN VIEW, CALIFORNIA William Jones Name Organization Role Responsibilities Contact Information Mark Prostko To be determined Blaine Tech Services, Inc. TN&A Laboratory Field Team Leader On-site Health and Safety Officer Laboratory Project Manager Responsible for directing day-to-day field activities conducted by TN&A and subcontractor personnel Verifies that field sampling and measurement procedures follow SAP Provides project manager with regular reports on status of field activities Responsible for implementing health and safety plan and for determining appropriate site control measures and personal protection levels Conducts safety briefings for TN&A and subcontractor personnel and site visitors Can suspend operations that threaten health and safety Responsible for delivering analytical services that meet SAP requirements Reviews SAP to understand analytical requirements Works with TN&A project chemist to confirm sample delivery schedules Reviews laboratory data package before delivery to TN&A Blaine Tech Services, San Francisco, CA Bjones@blainetech.com (408) 573-0555 TN&A, Ventura, CA Mprostko@tnainc.com (856) 491-6950 To be determined Page 3 of 3