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♦ti <br /> During drilling, undisturbed soil samples will be collected at five-foot <br /> intervals into stainless steel or brass sample sleeves In the field, a <br /> California registered geologist will log all soil samples for hydro geologic <br /> and lithologic characteristics according to the Unified Soil Classification <br /> System and screen each sample for any organic vapors using a <br /> photoionization detector (PID) calibrated to 100 ppmv isobutylene, and <br /> observations will be made for the visual identification of any soil staining <br /> or discoloration <br /> Soil samples will be wrapped in Teflon, followed by close-fitting plastic <br /> caps, and held at a temperature of 41 C while in the field and in transit to <br /> the laboratory which will be a state of California certified analytical <br /> laboratory <br /> Soil boring locations will be surveyed in the field and tied to the <br /> California State Plane Coordinate System zone appropriate for this area as <br /> well as provide latitude and longitude coordinates <br /> Soil sampling equipment will be decontaminated between sampling <br /> attempts using a non-phosphate, soap and water wash, a tap-water rinse, <br /> and a distilled, deionized water rinse (see Attachment 4 for the Soil Boring <br /> and Well Construction Procedures) <br /> • <br /> Task 7- Groundwater Monitoring Well Installation <br /> Seven of the soil borings will be completed as 2" diameter monitoring <br /> wells (Figure 9) The monitoring wells will be installed in accordance <br /> with PHSEHD regulations and the State of California Department of <br /> Water Resources' Water Wells Standards, Bulletins 74-81 and 74-90 The <br /> monitoring wells will be cased with 20 feet of 2-inch slotted PVC casing <br /> and the appropriate filter pack sand installed from the bottom of the soil <br /> boring to 3 feet above the slotted interval Blank PVC casing packed in <br /> neat cement grout will extend from the surface downward to the 3-foot <br /> bentonite seal placed above the filter pack A locking, water-tight well <br /> cover will be set in concrete to protect and secure the wellhead <br /> Attachment 3 and Attachment 4 describe for the Monitoring Well - <br /> Construction Details <br /> Following installation, the monitoring well will be developed by surging <br /> and bailing to remove drilling residues and to produce low-turbidity <br /> groundwater Prior to sampling, the proposed monitoring well and the four <br /> existing monitoring wells will be purged with a pre-cleaned bailer in order <br /> Mam\D\EnvironmentaI\ParmarTexaco\Workplan\042003 wpd 14 <br />