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Mr.Robert Gray Environmental 17 June 2014 Resources Page 5 Management Fourteen of the 0.5 and 4.5-foot samples were analyzed for metals. The deeper samples were put on hold, to be analyzed if impacts to the shallow soil from metals were discovered in the surface samples. Sixteen of the samples collected were analyzed for ethylene glycol,and the others were placed on hold. Other than the samples located near the ethylene glycol storage tanks (SB-13 and SB-19),the sampling locations and intervals that were chosen for analysis were selected at random,with a bias towards the shallower 0.5-foot and 4.5-foot sample intervals. As shown in Table 1, there were no detections of VOCs in any of the samples and some detections of TPH-diesel and-motor oil in the shallow 0.5-foot samples at the southern compressor station. Detections of TPH- diesel ranged from 19 milligrams per kilogram(mg/kg) to 48 mg/kg, and detections of TPH-motor oil ranged from 160 to 850 mg/kg. All metals were detected in the shallow soil samples,but only arsenic at concentrations above Tier 1 Environmental Screening Levels (ESLs). The Tier 1 ESLs,where applicable,are provided in Table 1 for comparative purposes. Arsenic was detected in every sample;concentrations ranged from 1.21 to 8.09 mg/kg. These values fall within the range of background concentrations of arsenic in Northern California (Diamond et al,2009). Ethylene glycol was not detected in any of the samples, including the samples located near the storage tanks at the northern and southern compressor stations. QUALITYASSURANCF,/QUALITY CONTROL All provisions in the Quality Assurance/Quality Control (QA/QC) Plan were followed during the field work.Specific QA/QC findings include: • Equipment rinsate samples were collected on both sampling days and analyzed for CAM 17 metals,TPH,ethylene glycol, and VOCs. Rinsate samples were collected by running distilled water over the bucket of the hand auger and capturing the runoff into the sample containers. Zinc was detected in equipment rinsate sample EB-2; however,no data were qualified because the detected sample concentrations were greater than 10 times the blank contamination. • Trip blanks were placed in the ice chest shipment of samples and were analyzed for VOCs. No analytes were detected in the trip blanks.