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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/I of m,p-xylene and 1.0 pg/I of o -xylene.
<br />Results of historical groundwater samples (Sample B1 -W, B2 -W, B3 -W, and SB1-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 S61 -W. The results of groundwater
<br />sample SB1-W indicated that the MCLs for arsenic (CA MCL 10 pg/I, detected at 43
<br />pg/1), beryllium (CA MCL 4 pg/l, 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/I, detected at 5.5 pg/1), and nickel (CA MCL 100 pg/I, 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 MWA and MW -2,
<br />located approximately 75 feet down -gradient of sample location SB -1, 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 ADCs 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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