ARCHIVED REPORTS XR0007793 - Laserfiche WebLink

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groundwater assessment conducted at MW-4 only In the event that wells MW-5, 6 and 7 are necessary and installed more than 90 days later than MW-4, a separate report of assessment will be produced for those locations ' Implementation of the Site Assessment Workplan and preparation of the supplementary PIER will be managed by a State of California Registered Geologist ' 3.1 FIELD METHODS AND SAMPLING PROCEDURES All borehole drilling, soil sampling and groundwater monitoring well construction activities will be conducted using hollow-stem auger drilling and sampling equipment and techniques Frontier Drilling, Modesto, California, will provide the drilling and soil sampling equipment, and all materials needed to install the monitoring wells Frontier Drilling holds a current, valid C-57 well ' driIler's license Underground utilities will be located by Underground Services Alert (USA) prior to commencing field activities The Site will be cleared of all obstructions by the Owner to ' allow unobstructed access All field personnel will be 40 Hour OSHA trained 3.1.3 DRILLING AND MONITORING WELL CONSTRUCTION ' Drilling and construction of the groundwater monitoring wells will be in accordance with the provisions of the State of California Water Resources Control Board Standards, specifically as provided in the LUFT Manual The procedures to be used will be as follows Drilling equipment will be thoroughly steam-cleaned with clear water prior to drilling each well bore Rmsate will be placed in 55 gallon drums and securely stored on the ' Site Figure 8 illustrates the location of the drum storage area Each drum will be labeled with date of accumulation, street address,contents of the drum, owner, and a contact phone number Offsite treatment/disposal will take place within 90 days of ' the accumulation date, or upon receipt of laboratory analyses, and will be the responsibility of the Owner • Each well bore will be logged in accordance with the Unified Soil Classification ' System All well bore logs will be prepared under the supervision of a California State-registered geologist ' a Soil samples for analyses will be collected every 5 feet, or at significant changes in lithology, beginning at a depth of 2 feet below ground surface to immediately above groundwater ' 0 Soil samples will be collected using a California split-spoon drive sampler lined with three,2-inch by 6-mch brass tube liners Soil collected in the first, or tip, liner will be preserved for analyses Care will be taken to assure that no headspace is present in ' the liner following sample collection Soil collected in the second liner will be screened with a portable Photo Ionization Detection instrument(FID) or equivalent instrument for organic vapor concentrations The measured values will be entered on the well bore log The contents of the third liner will be extruded and logged in accordance with the Unified Soil Classification System • Immediately after a sample is collected, each end of the brass liner that contains the soil sample to be preserved for analyses will be covered with Teflon tape or 366-002 -6-