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July 1, 2011 AEI Project No. 297937 Page 3 of 5 groundwater samples. Groundwater is expected at approximately 55 to 60 feet bgs. It is anticipated that one (1) soil and one (1) groundwater sample will be analyzed from each boring. Predrilling and Site Safety Prior to completing drilling activities, soil boring permits will be obtained from the EHD, and the EHD be notified prior to beginning work. AEI will notify Underground Services Alert of the location for the planned drilling activities a minimum of 48-hours before performing the work, as required by law. An independent utility locator will be used to locate subsurface utilities within the vicinity of the proposed drilling locations. Locations of the borings may be altered based on utility survey findings, particularly if underground utilities are identified within the drilling areas. Drilling The selected drilling contractor will hold a California C57 driller's license. Soil borings will be advanced with a truck mounted (or similar) Geoprobe`� direct-push drilling rig. Following sample collection, each boring will be backfilled with cement grout in accordance with the permit conditions. Soil Sample Collection Soil in the shallow borings will be continuously collected in 13/4 inch diameter acrylic liners within the sampling barrel from which a 6 inch sample will be collected at appropriate depths. Samples will be selected and cut from the liners. The sample will be sealed with Teflon tape and plastic end caps. A photo ionization detector (PID) will be used to screen soil samples in the field, and PID readings for each sample will be included on the boring logs. Groundwater Sample Collection When first groundwater is encountered, a 3/4" diameter slotted PVC casing will be temporarily inserted into the borehole to facilitate groundwater collection. Groundwater samples will be collected using either a disposable bailer and decanted into the appropriate sample containers. The containers will be sealed so that no head-space or air bubbles are visible within the containers. Sample Storage All samples will be sealed and labeled immediately upon collection. Samples will be placed in a cooler with water ice. Chain of custody documentation will be initiated prior to leaving the site. All samples will be delivered to a state certified laboratory. Sample Analyses Select soil samples will be analyzed for the following: • CAM17 Metals • Chromium VI • Volatile Organic Compounds by EPA Method 8260 • pH using field or laboratory methods Select groundwater samples will be analyzed for the following: 0 CAM17 Metals