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CLEARWATER <br /> G R O U P [ \ C <br /> Ena:ronmrnta! Scraces <br /> • Continue quarterly groundwater monitoring to determine trends in contaminant concentrations and hydrogeologic <br /> conditions <br /> All work will be conducted in accordance with the LUFT Field Manual, the Tri-Regional Board Staff Recommendations, <br /> and Article 11 Corrective Action Regulations of Chapter 16 Under Storage Tanks Regulations <br /> Proposed Methods <br /> Soil BQnngs Using-a Hollow Stem Auger Dnll b& <br /> Prior to drilling, Clearwater will prepare site specific Health and Safety Plan for drilling activities Prior to conducting <br /> and drilling, the site will be marked by Underground Service Alert (USA) to identify utilities leading to the site <br /> Appropriate drilling and encroachment permits will be obtained to the start of fieldwork All fieldwork will be conducted <br /> in accordance with Clearwater's Field Protocols (attached) <br /> Soil bonngs will be advanced using a truck-mounted hollow stem auger dnll-rig Soil samples will be collected at 5-toot <br /> depth intervals using a sampler lined with brass sleeves from all bonngs Portions of each soil sample will be retained for <br /> a visual sedimentologic description by a Clearwater geologist using the Unified Soil Classification System and screening <br /> for organic vapors using a photo-ionizing organic vapor meter(OVM) Soil samples retained for laboratory analysis will <br /> be covered with Teflon lined end caps, labeled,documented on a chain-of-custody form, and placed on ice in a cooler for <br /> transport to the project laboratory Soil samples will be selected for laboratory analysis based on elevated OVM readings <br /> field observations, and proximity to the capillary fringe It is anticipated that at least one two, but no more than five soil <br /> samples will be submitted for analysis from each borehole <br /> It is anticipated that boring depths will not exceed approximately 36 feet bgs <br /> A grab groundwater sample will be collected directly through drill-pipe at each boring with either a stainless steel or a <br /> disposable polyethylene bailer If needed, a temporary well will be placed in each borehole to facilitate collection of a <br /> groundwater sample Each temporary well will be constructed with clean schedule 40 PVC materials with machine slotted <br /> screen Samples will be transferred to laboratory supplied sample bottles, labeled, documented on a chain-of-custody <br /> form,and placed on ice in a cooler for transport to the project laboratory <br /> Upon completion of sampling and removal of temporary well casing, all boreholes will be backfilled to the surface with <br /> cement Drill-pipe and sampling devices will be cleaned by steam cleaning or in an AlconoxO wash followed by double <br /> rinse in clean tap water to prevent crass-contamination Rinseate will be stored in labeled 55-gallon drums on-site <br /> pending removal and disposal <br /> Groundwater and soil samples will be analyzed for concentrations of TPHg and BTEX by EPA Methods 8015 (modified) <br /> • and 8020 Additionally, samples will also be analyzed for concentrations of MTBE by EPA Method 8260 Sample <br /> analysis will be performed by Entech Analytical Labs, Inc (Entech), a California DHS-certified laboratory, located in <br /> Sunnyvale,California <br /> Ms Lon Duncan 3 Movember9 1999 s <br />