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i 01 November 2000 AGE-NC Project No 95-0173 Page 3 of 6 I2 5 MONITORING WELL COMPLETION Soil boring MW-13 was single-completed as a ground water monitoring well utilizing schedule 40, 2-Inch diameter blank polyvinylchlonde (PVC) well casing and perforated, 2-inch diameter PVC well casing (0 020-Inch slot) I The well was Installed by placing the PVC well casing assembly through the hollow stem of the augers to the total depth of the boring The augers were Incrementally raised as No 3 Lonestar Lapis Luster sand(filter pack)was slowly poured down the annulus between the well casing and the Inner ' wall of the hollow stem auger The filter pack was placed adjacent to the screened casing from the bottom of the boring to a point approximately two feet above the top of the screen, following filter pack placement, a surge block was Inserted into the well casing and was alternately raised and lowered (surged) repeatedly for approximately 20 minutes Five feet of bentonite pellets (annular seal)were placed above the filter pack and were hydrated with ground water The remaining annular space was backfilled with portland cement (grout seal) An as-built monitoring well-construction diagram is Included as Figure 3 • 2 6 WELL DEVELOPMENT ACTIVITIES I On 12 September 2000,monitoring well MW-13 was developed utilizing a stainless steel hand bailer and a Grundfos submersible pump I Approximately 25 gallons of ground water were removed from the well until the well was pumped "dry" Purged ground water was containerized in properly labeled D O T -approved model 17H 55- gallon drums and was stored on-site in an area lacking public access Monitoring well field logs for Idevelopment activities are included in Appendix B Following well development, a ground water sample was collected from the purged well utilizing a new, disposable polyethylene bailer, a one-liter amber bottle without preservative and four 40-m1 EPA-approved VOA vials containing 0 5 ml 18% hydrochloric acid as a preservative Care was taken to ensure that visible air bubbles were not present in the vials after filling and capping Ground water sample containers were labeled with the well designation, date, time, and sampler's Initials The ground water sample was logged on a chain-of-custody form, placed in a chilled container and transported to a California Department of Health Services (DHS)-certified laboratory for analysis for • TPH-g and TPH-d by EPA Method 5030/3550/8015M, • BTEX with MTBE by EPA Method 8020 IAdvanced GeoEnvironmental,Inc I