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Draft RD/RAWP Remedial Action at IR Site 25 Former NAS Moffett Field Moffett Field, California portion of Moffett Field’s west side, including the Hangar 1 area, flowed to the Lindberg Avenue ditch, which directedd the flow to the northeastern corner of EDM. In 1991, NASA redesigned the storm water collection system for the western portionn of Moffett Field so that runoff is directed into an underground pipe network. This network directs the water to Storm Water Settling Basin (SWSB; also referred to as facility NA289), a concrete basin located at the southern edge of EDM. SWSB also receives treated groundwater from the West-Side Aquifers Treatment System (WATS), a groundwater remediation system operated by the Navy (approximate system flow rate is 50 gallons per minute [gpm]). The SWSB outfall discharges effluent into EDM. The SWSB also has an overflow spillway that allows influent water to bypass the settling basin and flow directly into EDM during heavy rain events. Sediment that settles at the SWSB is characterized and removed by NASA annually, typically during August-September. From EDM, water drains by gravity through three 48-inch culverts under North Perimeter Road to the central basin of the SWRP. The central basin in turn connectss to the western and northeastern portions of the SWRP through breaches in levees. Portions of SWRP are flooded with 1 to 5 feet of standing water during wet months, butt historically are dry during summer and fall periods. This may be due to increased rainfall in 2009 and 2010 or possibly a hydraulic connection to the former solar salt ponds (now indundated and tidally influenced) north of IR Site 25. There are several “upland areas” in the central basin thatt are controlled by NASAA ARC. One upland area, Area of Investigation (AOI) 14, is approximately 8 acres in size. Soil at AOI-14 has been characterized as being impacted with PCBs. Response actions at AOI-14 are being administered by NASA and are not a direct part of the IR Site 25 RA. Previous investigations have indicated that within IR Sitee 25, sediment with the highest COEC concentrations is found near the former discharge point of the Lindberg Avenue ditch in the EDM, and that COECC concentrations generally decrease with distance from that point. This 7
Draft RD/RAWP Remedial Action at IR Site 25 Former NAS Moffett Field Moffett Field, California pattern was confirmed by results of the recent pre-designn investigation of sediment that was completed in 2010 and discussedd in detail in the Final Data Summary Report for Pre-Design Investigation of Sediment at IR Site 25 (KCH, 2011). In August-September 2005, NASA excavated 450 CY off shallow soil from EDM in areas immediately to the north of the SWSB; and in Septemberr 2006, NASA excavated another 500 CY of shallow soil from adjacent areas farther northh and west off the previously excavated areas. Analyses of this material indicated the presence of PCBs, lead, and zinc, but not DDT (Integrated Science Solutions, Inc., [ISSI], 2007). 2.1 LAND USE The objective of the project is to conduct an RA so that IR Site 25 is available for unlimited use and unrestricted exposure. Potential future uses include: : use as a tidal marsh to support a wide variety of habitat; and use as a managed pond that provides storm water retentionn and open water habitat. 2.2 CLIMATE Moffett Field is located along the southwestern end of San Francisco Bay adjacent to the cities of Mountainn View and Sunnyvale, California. The Moffettt Field environs are relatively sheltered by coastal range mountains from westerly winds and storms from the Pacific Ocean, compared to other portions of the San Francisco Bay Area. The area near Moffett Field has a Mediterranean climate, with warm, dry summers and mild, wet winters. Monthly average maximum temperatures for Palo Alto, 4 miles north of Moffett Field, range from 57.4 degrees Fahrenheit (ºF) in January to 78.5ºF in August to. Monthly average minimumm temperatures range from 38.3ºF in December to 54.8ºF in July. Palo Alto receives an average of 15.41 inches of precipitation per year. Averagee monthly precipitation ranges from 0.02 inches in July to 3.22 inches in January. Monthly averages for the six driest months are as follows: May, 0.39 inches; June, , 0.09 inches; July, 0.02 inches; August, 0.05 inches; September, 0.18 inches; and October, 0.70 inches. Monthly averages for the six wettest months are as follows: November, 1. 81 inches; December, 2. .77 inches; 8
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• O Organizing and maintaining al
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Draft Quality Control Plan Remedial
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QCP ATTACHMENT 1 DESIGNATION LETTER
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AND LOCATION T R A N S M I T T A L
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Project-Specific SAP for the Remedi
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References California Department of
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SAP ATTACHMENT 1 SAMPLE FIELD FORMS
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2730 Shadelands Drive, Suite 100 Wa
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Sheet ____ of ____ Low-Flow Groundw
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2730 Shadelands Drive, Suite 100 Wa
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SAP ATTACHMENT 2 SAMPLE QUALITY CON
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Sheet _____ of _____ NON ROUTINE OC
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Standard Operating Procedure Shallo
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Standard Operating Procedure Sample
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Attachment A Sample Preservation an
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Attachment A Sample Preservation an
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Standard Operating Procedure Field
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Event Location ID Sample Type Field
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SAP ATTACHMENT 5 RWQCB Screening fo
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Table B. Environmental Screening Le
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Table B. Environmental Screening Le
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ID Task Name Duration Start Finish
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TABLE OF CONTENTS TABLE OF CONTENTS
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EXECUTIVE SUMMARY This Biological A
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Figure 1. Project Action Area with
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sampling. The qualified biologist w
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experienced botanist will inspect a
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Aerial image is a 8/21/2009 image f
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Habitat Photo 1. Pickleweed/Saltgra
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Habitatt Photo 4. Eastern Diked Mar
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Table 1 Continued Scientific Name C
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Table 2. Federally‐listed Fish fr
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Table 3. Federally‐listed Birds f
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Table 4. Federally‐listed Mammals
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icarioides missionensis). Appropria
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Table 6. Special‐status Plants fr
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Figure 10. Critical habitats design
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No federally-listed invertebrate sp
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Acronyms and Abbreviations CDFG CEQ
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References Barbour M.G., T. Keeler-
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USFWS. 2010a. U.S. Fish and Wildlif
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Appendix D. Species List for Milpit
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Scientific Name Common Name Family
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Scientific Name Common Name Family
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Table 1. Special‐status Amphibian
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Table 2. Special‐status Fish from
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Table 3. Special‐status Birds fro
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Table 3. Continued. Scientific Name
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Table 4. Special‐status Mammals f
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Table 5. Special‐status Invertebr
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Table 6. Special‐status Plants fr
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Table 6. Continued Scientific Name
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