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NOVO I s;ULTNC 2.0 METHODS AND PROCEDURES 2.1 Soil Boring Locations Nova completed two (2) exterior Geoprobe® soil test borings (labeled SB-1 and SB-2) and two (2) interior hand auger soil borings (labeled SB-3 and SB-4) at the Site on March 28, 2013. Site photographs are presented in Appendix A. A summary of the sampling locations is provided in the following Table 1. A Soil Boring Locations Map is attached as Figure 3. TABLE 1 SOIL BORING LOCATIONS AND AREAS OF CONCERN Soil Boring ID Location/Area of Concern/Rationale for Placement SB-1 North side of dry cleaner in front of back door. SB-2 West side of building in the assumed hydraulically downgradient direction. SB-3 and SB-4 Back side of dry cleaner PCE machine(interior) 2.2 Soil Boring and Temporary Monitoring Well Procedures The soil borings were completed by Vironex contractors using a truck mounted Geoprobe® Model 6600 hydraulic push probe. A Geoprobe® Macro-Core sampler was used to collect the soil continuous soil samples from grade level down to thirty (30) feet below grade (bg) at the borings. The Macro-Core sampler consists of a 2.25-inch outside diameter, 48-inch long nickel-plated alloy-steel sampling tube that is continuously filled with soil as it is pushed and/or hammered to the termination depth of the borings. The sampling tube is fitted with a single use polyethylene terephthalate (PETG) liner. An environmental geologist recorded a physical description of the soils encountered at each boring location on a field-boring log. Visual classification of soil was based on American Society of Testing and Materials methods 2487 and 2488, Soil Conservation Service, and American/Canadian Stratigraphic standards. The soil sample descriptions included type, color, grain size, texture, and moisture. The descriptions were recorded on soil boring logs. Upon completion of the borings, temporary groundwater monitoring wells were installed in the boreholes. The temporary wells were constructed using a 3/4-inch diameter, ten-foot long, 0.010-inch slot PVC screen threaded to a 3/4-inch diameter PVC riser. Prior to collecting the groundwater samples, the sampling points were developed utilizing a small diameter stainless steel check ball bailer attached to dedicated polyethylene tubing. When recharge allowed, the sample point was purged until a significant reduction in the amount of suspended solids was observed in the discharge water. Upon completion of the soil and groundwater sampling, the boreholes were abandoned in accordance with California regulations. The groundwater samples were decanted into laboratory supplied containers, placed in a cooler under refrigerated conditions and shipped, under chain-of- custody protocol to a certified laboratory. RALEY'S STOCKTON NOVA PROJECT NO.B13-0472 PAGE 3 APRIL 9,2013