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Mr.Paul Fry �'� ~"op, <br /> NWE Project 05-001500 <br /> July 31, 1998 <br /> Page 3 of 7 <br /> • Identification of underground utility locations in the area. <br /> • Advancement of three soil borings to groundwater at the site (borings <br /> SB1 through S133) as indicated on Figure 2. <br /> • Collection of soil samples at 5 foot intervals. <br /> • Field screening of each collected soil sample for the presence of <br /> organic vapors using a portable photoionization detector(PID). <br /> • Collection of groundwater samples from each boring. <br /> • Submittal of selected soil samples and all groundwater samples <br /> collected from the soil borings to a state-certified laboratory for <br /> analysis of TPHg, TPHm, BTEX, and VOCs. <br /> • Preparation of this Report summarizing the data collected. <br /> FIELD PROCEDURES <br /> On July, 16, 1998, NWE observed the drilling and selective soil and groundwater <br /> sampling of borings SBI through S133 to depths of 20 feet below grade (Figure 2). <br /> The drilling locations were selected based on their proximity to the former T JS <br /> 'T <br /> and pump island forrnerly located on the .subject Property. Drilling of the soil <br /> borings was performed by Fisch Enviionmentai of Valley Springs, California, <br /> using truck-mounted, limited-access, GeoprobeTm direct-hydraulic-push <br /> equipment. All sampling equipment was washed in an Alconox solution <br /> (GeoprobeTM) and then rinsed with tap waier and distilled water before and after <br /> each use. Groundwater samples were obtained from each soil boring using a <br /> Hydropunch sampling assembly. Recovered soil samples were described by <br /> NWE personnel using the Unified Soils Classification System. Field estimates of <br /> general soil type, color and moisture were noted on each of the boring logs <br /> (Attachment A). Below the surface asphalt at the: site, soil boring SB-1 (generally <br /> representative of site soil units) encountered a brown, silty sand mixture to a <br /> depth of approximately 15 feet bgs. Soil encountered from a depth of 15 feet bgs <br /> to 20 feet bgs consisted of brown and tan, saturated sandy clay with high plasticity <br /> and small gravels. Groundwater was encountered at a depth of approximately 20 <br /> feet below grade. <br /> All soil samples collected were screened in the field for the presence of organic <br /> vapors using a PID, as well as by visual and olfactory means. PID screening <br />