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Ron Rowe A CAMBRIA April 27, 1998 .� INVESTIGATION PROCEDURES AND RESULTS In the Investigation Woik Plan Addendum No 2,Cambria proposed installing ground water monitoring wells near the eastern dispenser, near the east side of the former USTs where the product piping entered the tank pit, and at the southwest corner of the property The results of Cambria's March 25, 26, and 27, 1998 well installations are summarized below The monitoring well locations are shown in Figure I Two cross sections are included as Figures 2 and 3 Analytical results for soil chemical and physical parameters are presented in Tables I and 2, respectively Paul Waite of Cambria was onsite to oversee the well drilling and sampling on March 25 and 26, 1998 Ron Rowe of the SICPHS visited the site during the morning of March 25, 1998 and indicated that further SJCPHS oversight of the drilling and well installation activities was not required Mr Waite updated Mr Rowe via telephone throughout the fteld activities Soil Borings and Well Installations Permits SICPHS Drilling Permit No 014530 (Attachment A) Drilling Dates The held woik was performed from March 25, 1998 through March 27, 1998 Drilling Method 8-inch hollow stem auger The first 5 ft of each boring were hand-angered Soil Sampling The soil sample collected from approximately 2 5 ft depth was from hand-auger cuttings The rest of the samples were collected using an 18-inch modified California split spoon sampler with brass lineis or a 5-foot continuous core barrel with clear acetate liners Water Sampling In the Investigation Work Plan Addendum No 2, Cambria proposed discrete ground water sampling during the drilling During his March 25, 1998 site vistt, Mr Rowe agreed that because of the silty soil types encountered, discrete interval water sampling would not be effechve and therefore was not required No water samples were collected from the borings Number of Wells Three Wells MW-1, MW-2, and MW-3 (Figure 1) Boring Depth Monitoring well MW-1 was bored to 32 ft below giade, and wells MW-2 and MW-3 to 36 ft below grade(Attachment B) Ground Water Depth In well MW-1,ground water was initially encountered at 16 5 ft, and the static water level was measured at 26 5 ft In well MW-2, ground water was first encountered at 17 ft and the static water level was estimated at 17 ft In well MW-3, water was first encountered at 16 ft, and the static water level was measured at 16 3 ft (Attachment B) 2