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characteristics according to the Unified Soil Classification System(Table 2)and <br /> screen each sample for any organic vapors using a photoionization detector(PID) <br /> calibrated to 100 ppmv isobutylene,and observations will be made for the visual <br /> identification of any soil staining or discoloration. <br /> Soil samples will be wrapped in Teflon, followed by close-fitting plastic caps, <br /> and held at a temperature of 4 °C while in the field and in transit to the laboratory <br /> which will be a state of California certified analytical laboratory. <br /> Soil boring locations will be surveyed in the field using a global positioning <br /> system(GPS) accurate to within 0.1 foot horizontal and will be tied to the <br /> California State Plane Coordinate System zone appropriate for this area(Zone 3, <br /> NAD83 projection)as well as provide latitude and longitude coordinates in <br /> WGN84. <br /> i <br /> Soil sampling equipment will be decontaminated between sampling attempts <br /> using a non-phosphate, soap and water wash; a tap-water rinse; and a distilled, <br /> deionized water rinse(see Appendix S and 6 for the Soil Boring and Well <br /> Construction Procedures). <br /> Task 4- Groundwater Monitoring Well Installation (If directed by PHSEHD) <br /> Two of the soil borings may be completed as 2" diameter monitoring wells if <br /> directed by PHSEHD. The monitoring wells will be installed in accordance with <br /> MCDPH regulations and the State of California Department of Water Resources' <br /> Water Wells Standards,Bulletins 74-81 and 74-90. The monitoring wells will be <br /> cased with 20 feet of 2-inch slotted PVC casing and the appropriate filter pack <br /> sand installed from the bottom of the soil boring to 3 feet above the slotted <br /> interval. Blank PVC casing packed in neat cement grout will extend from the <br /> { <br /> MainlD\Environmental%\STE\Workplan%Workpinnl l 192007wpd 19 <br /> I <br /> A <br /> I <br />