ARCHIVED REPORTS_2015 SITE INVESTIGATION WORK PLAN

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30 January 2015 AGE Project No. 14-3154 Page 3 of 9 1.5. PREVIOUS INVESTIGATION On 04 December 2014, seven soil borings (AB1 through AB7) were advanced near the southern edge of the factory area. On 05 December 2014, nine soil borings (AB8 through A1316) were advanced within an area of the property were former glass debris and dust waste streams were historically managed/treated and stored; and near the former surface sewer discharge areas, east of the glass storage area. On 08 December 2014, five soil borings (AB17 through AB21) were advanced within an area of the property were former glass debris and dust waste streams were historically managed/treated, stored and disposed on the surface. The majority of the soil borings were advanced to depths of 15 feet below surface grade (bsg). However, borings A131, AB2, AB3 were advanced to depths of 25 feet bsg; and borings A136 through A138, A1310, AB12 and AB16 were advanced to depths of 20 feet bsg. Soil boring locations are illustrated in Figure 2. SOIL SAMPLE COLLECTION Soil samples were collected at a minimum of five foot intervals from the soil borings using a 1.45-inch diameter Geoprobe soil sampling assembly loaded with one two-foot long acetate sleeve. After sample collection, a portion of the acetate sleeve was separated and the ends were covered with Teflon sheets, capped and sealed with tape. Sample sleeves were labeled with soil boring location, depth, time, date and sampler's initials and then placed in a chilled container. Soil sample duplicates were extruded into plastic bags and field-screened for the presence of organic vapors using an organic vapor meter (OVM), equipped with a photo-ionization detector (PID). Additionally, the soil was visually classified in accordance with the Unified Soil Classification System (USCS). Soil boring logs were included in the previous report. GRAB GROUNDWATER SAMPLE COLLECTION Grab groundwater samples were collected from borings AB1, A132, AB3, A66, AB7, AB8, AB10, AB12, and AB16 at depths between 15 and 20 feet bsg. Groundwater samples were extracted from each boring into non preserved 40-ml glass vials, one-liter amber glass containers and 250-ml plastic containers. LABORATORY ANALYSIS Following soil and groundwater sample collection, each preserved sample sleeve or groundwater sampling container was labeled with the boring location, depth, time, date, and sampler's initials. Appropriately sealed and labeled samples were placed in a chilled container and transported under chain of custody to CTEL, a CDPH-Certified Advanced GeoEnvironmental Inc.