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0 0 <br /> Soil-Gas Investigation Workplan July 6, 2015 <br /> 200 N Beckman Rd. Page 2 <br /> inside it, was advanced at four-foot intervals. To collect the sampling rod was <br /> then withdrawn along with the soil-containing PVC liner. A new PVC tube liner <br /> was attached to the sample retrieval rods and the process repeated at 4-foot <br /> intervals to reach the targeted sample depth. <br /> Immediately upon removing the plastic tubing containing the soil, the tubing was <br /> cut at those corresponding depths. The sample tubes was capped with Teflon® <br /> and fitted with plastic end caps. Each tube was marked and placed in a cooler on <br /> water ice at a temperature of 4 degrees Celsius (checked using a thermometer) <br /> pending transportation to Accutest Laboratories under chain of custody. Accutest <br /> Laboratories is NELAP Accredited by the California Department of Public Health, <br /> Environmental Laboratory Accreditation Branch, Certificate #08258CA. <br /> A Professional Geologist recorded soil types (according to the Unified Soil <br /> Classification System), and other pertinent geologic data on borehole. Continuous <br /> core soil samples were collected to identify subsurface lithology, potential staining <br /> and other sign of contamination at each of borehole location. In addition to <br /> visually classifying the soils, the geologist carefully examined the core for such <br /> features as root-holes, fractures, mineralization, and thin micro-bedding. <br /> Drilling continued to 10 ft bgs in the hoist area and to 5 feet bgs in the former <br /> vehicle service area. <br /> After completion of sampling activities, each boring was backfilled to surface <br /> grade with neat cement grout composed of one sack of Portland Type I/II cement <br /> (94 lbs.) to approximately five gallons of potable water provided by the driller. <br /> Drilling and sampling equipment was steam cleaned or thoroughly scrubbed with <br /> alconox solution followed by a distilled water rinse prior to being brought on site <br /> and between samplings. Grouting was supervised by the San Joaquin County's <br /> Inspector. <br /> All drilling activities and sampling was supervised by a California-Registered <br /> Professional Geologist (#7503) and in accordance with procedures referenced <br /> within a Health and Safety Plan (signed in the field). <br /> Environmental and Remediation Services since 1992! <br />