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i.. r,r Site Assessment Work Plan Advanced Environmental Concepts, Inc. be recorded on a Chain-of-Custody document, placed in a cooler with frozen blue ice, and transported to a California Certified Laboratory under Chain-of-Custody protocol. V 5.3 Field Screening of Soil Samples Soil samples will be collected using three 1.5 x 6-inch brass tubes installed inside a-split- spoon sampler. The middle sample tube will be immediately capped, sealed, labeled, and stored in an ice chest containing blue ice. The bottom tube will be used for lithologic i., description,and the top tube will be used for field screening. A headspace reading using the PID will be collected and documented on the boring log. 5.4 Soil Analyses The soil samples will be analyzed by Associated Laboratories, Inc. in Orange,a California Certified Laboratory with state guidelines and EPA protocols. Selected samples will be analyzed for total petroleum hydrocarbons as gasoline and diesel (TPH-g &TPH-d) by CA DHS methods and volatile aromatic organics (BTEX) by EPA method 8020. 5.5 Installation of Monitoring Wells Each monitoring well will be constructed according to Figure 4,Appendix A and installed in the following manner: Approximately 30 feet of new 2-inch, flush-threaded, Schedule 40 PVC casing will be set in the well through the auger. The bottom 10 feet will be composed of 0.010-inch factory slotted liner,thus 5-feet of slotted casing will be above the potentiometric surface allowing for seasonal fluctuations in the water table and to permit sampling of the airtwater interface. Number 2116 Monterey sand will be slowly poured �•+ down the annulus while removing 5 feet of auger at a time. The filter pack will be placed 1 foot above the screened interval. A 3 foot seal;of hydrated bentonite with be poured above the sand filter pack. A cement/bentonite slurry will be used to fill the annular space to within 1 foot of grade level. The well cover boxes will then be cemented in and sloped to minimize water accumulation. 5.6 Well Development/Sampling Each monitoring well will be developed using a submersible pump approximately 24-hours after installation. The wells will be pumped until the effluent is clear and free of fine- grained sediments and then be allowed to regain equilibrium before sampling and measuring depth to groundwater, v Prior to sampling, each monitoring well will be purged of a minimum of four casing volumes of groundwater. The groundwater will be pumped into appropriately labeled V DOT approved 55-gallon drums and stored on-site. Groundwater measurements will be Project: AEC 96C-1707 5 V • ENVRONMENTAL CONCEPTS WITH DESIGN IN MIND bw 4400 ASHE ROAD.#206 • BAKERSFIELD.CA 93313 8051831-1646 • FAX 8051831-1771