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24, and historical sample MW3-20). Results of the soil samples indicated that metals,
<br /> VOCs, SVOCs, TO-G, PCBs, pesticides, and/or cyanide were not detected above
<br /> CHHSL values for commercial/industrial land use. The boring locations from the
<br /> August 2012 through November 2012 sampling activities are shown on Figures 2.
<br /> Historical soil samples collected at the SWMU prior to use by AIT (MW3-20)
<br /> demonstrated no significant impacts to soils.
<br /> Groundwater
<br /> Results of the groundwater sample from existing monitoring well (MW-2), collected
<br /> August 2012 at 20 feet bsg, indicated that cyanides, metals, TPH gasoline, TPH
<br /> diesel, TPH motor oil, and VOCs were below the method detection limits, except 2.2
<br /> pg/1 of m,p-xylene and 1.0 pg/I of o-xylene.
<br /> Results of historical groundwater samples (Sample B1 M, 132-W, 133-W, and SBI-W),
<br /> collected October 1994 and June 1995 at 20 feet bsg, during investigation conducted
<br /> by AIT, indicated that SVOCs, VOCs, TO-G, PCBs, pesticides, and/or cyanides were
<br /> below the analytical reporting limit and/or the MCL for California drinking water, with
<br /> the exception of metal results from sample SB1 M. The results of groundwater
<br /> sample SB1-W indicated that the MCLs for arsenic (CA MCL 10 pg/1, detected at 43
<br /> pg/1), beryllium (CA MCL 4 pg/I, detected at 25 pg/1), chromium (CA MCL 50 pg/I,
<br /> detected at 370 pg/1), lead (CA MCL 15 pg/1, detected at 960 pg/1), mercury (CA MCL
<br /> 2 pg/1, detected at 5.5 pg/1), and nickel (CA MCL 100 pg/1, detected at 1,700 pg/1) were
<br /> exceeded. Sample SB1-W was collected on June 25, 1995 by AIT. Sample SB1-W
<br /> was located between SWMU No. 3 and SWMU No. 5. Based on the results of soil
<br /> samples (Sample #2-24, #2-36, #3-24, #4-24, #4-36, #5-24, #6-24, and #7-24, and
<br /> historical sample S-1-5 and S-2-5) collected in the area, ranging in depth between 12
<br /> and 35 inches below the cement slab, do not indicate that a surface release has
<br /> occurred. In addition, groundwater results from monitoring wells MW-1 and MW-2,
<br /> located approximately 75 feet down-gradient of sample location SBA, collected and
<br /> analyzed on October 21, 1994, June 20, 1995 and August 30, 2012, indicate that all
<br /> results for metals are below the method detection limit or below CA MCLS.
<br /> 5. CONCLUSIONS
<br /> The purpose of the Phase I/RFA and Closure Report was to determine if the Site had
<br /> been adversely impacted from a surface and/or a subsurface release from the tier
<br /> permitted facilities and/or other support activities at the Site, and if so to identify
<br /> appropriate corrective measures to meet the following goals: 1. Protect human health and
<br /> the environment; 2. Achieve media cleanup objectives; and, 3. Control the sources of
<br /> release so as to reduce or eliminate, to the extent practicable, further releases of
<br /> hazardous constituents that may pose a threat to human health and the environment.
<br /> To meet these goals, each of the seven identified SWMUs, the two AOCs and other on-
<br /> site operations were further evaluated to ensure that soil or groundwater had not been
<br /> impacted from a release. The findings of the Phase I/RFA and Closure Report concluded
<br /> the following:
<br /> Statement of Basis for Former Advanced Interconnect Technologies, Inc. Facility Page 12 of 15
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