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R■ KLEINFELDER of approximately 25 feet bgs, (with groundwater flow direction estimated to the east) according to previous boring log datacollected by Advanced GeoEnvironmental, Inc. prepared for Preston Pipelines. After collection, the soil samples will be labeled, logged on a chain-of-custody, and immediately stored in an iced cooler. The soil samples will be submitted to Sequoia Analytical of Sacramento, California, (a State certified laboratory) and analyzed for the following analyses: • Total Petroleum Hydrocarbons-gasoline (TPH-g)by EPA Method 8015; • Benzene, Toluene, Ethylbenzene, Xylene (BTEX)by EPA Method 8020; • 1,2 DCA by EPA Method 8260; • EDB by EPA Method 8260; • TBA by EPA Method 8260; and • Oxygenates,MTBE,DIPE, ETBE, TAME by EPA Method 8260. The samples will be analyzed on a normal laboratory schedule requiring approximately two weeks (ten working days) for completion unless the optional rush analytical turnaround is requested by the client at an additional charge. One monitoring well (MW-1) will be installed on the west side of the warehouse building. This location has been chosen to represent an upgradient condition to the subject site. The upgradient well is proposed to be installed approximately 20 feet west of the warehouse. Two additional monitoring wells (MW-2 and MW-3) will be installed southeast and northeast of the warehouse area to monitor downgradient conditions of the subject site. The downgradient wells are proposed to be installed approximately 30 to 40 feet from the warehouse. � I 5 I The boring will be advanced approximately 10 to 15 feet into groundwater. A 2 - inch Schedule 40 PVC monitoring well will be constructed in the boring. The wells will be constructed with schedule 40 PVC, a 15 foot long, 0.020 inch screened section surrounded by and covered by clean sand filter pack (#2/12), 3 foot thick bentonite transition seal above the filter pack, and grouted to the surface. The wells will be finished with a locking pressure cap situated within a monument or flush style well vault (depending on surface conditions). See the Proposed Diagram of Well Construction (Plate 3). Once the monitoring wells have been installed, the top of each well will be surveyed so that depth to groundwater measurements in the wells can be converted to groundwater elevations used to assess groundwater gradients. The wells will be surveyed relative to a local benchmark. If a local benchmark is not available near the site, the wells will be surveyed relative to an onsite, assumed benchmark with an assigned elevation. The wells will be surveyed as described in Appendix�3.4. i o S10 MONITORING I' MONITORING WELL DEVELOPMENT A minimum of 48 hours after installation, the monitoring wells will be developed to remove fine silt from the well bore and to effectively increase the hydraulic radius of each monitoring well. Surging along the screened interval of the well will be performed to draw the sediment from the formation into the filter pack and the well and to set the sand pack. The monitoring wells will be 02001PROP.ENV/ST04P347/KS:ss Page 3 of 8 Copyright 2004,Kleinfelder,Inc. August 16,2004