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CL_E__A_4 RWATER G R O U P, I N C. • Wells will be constructed of 2-inch-diameter Schedule 40 PVC casing and slotted screen • Twenty feet of screen (0.020-inch slot size) will be placed in the wells • A sand filter pack consisting of No. 3 Monterey sand will be placed in the well annulus from total depth to two feet above the top of the screened interval • A bentonite seal three feet thick will be placed over the filter pack (the seal will be made by hydrating bentonite pellets) • The remainder of the well annulus will be filled with grout consisting of neat cement or cement/bentonite grout with no more than 3 % bentonite • Traffic-rated well boxes will be mounted (flush to grade) over the monitoring wells, and locking well caps will be placed in the top of the well casings • The three monitoring wells will be developed no sooner than 72 hours after installation has been completed; development will be accomplished by surging and pumping a minimum of 10 well volumes from each well; the wells will be developed until the groundwater appears clear • Well installation, soil sampling, well development, and groundwater sampling will be conducted in accordance with a Health and Safety Plan that has been reviewed by the PHS. 2.3 Chemical Analyses of Soil and Groundwater Samples All chemical analyses will be conducted at an analytical laboratory that is certified by the state of California to conduct the analyses listed below. Soil and groundwater samples will be stored on ice and transported (under chain of custody procedures) to the laboratory. Soil samples collected from the borings will be analyzed for: • TPHg (EPA Method 8015) • BTEX (EPA Method 8020). (Note: Please submit a unit price for the above analyses, on a per sample basis). D108 WP (revised)1/96 6 •