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50 and 8 determine the condition of aquifer(s) between 50-80 feet bgs and allow more definitive same del (d placement of screening intervals below 50 feet (if necess MW5, MW6, and MW7 Monitor well MW4 will be completed,d, developed, and s ) in proposed monir wells The spec ampled along with the existing three monitor wells to verify the results from. the hydropunch are detai water samples naILLI Monitor well MWS will be drilled following the completion and receipt of certified laboratory results from monitor well MW4 Monitor well MW5 will be located northeast The pro of the former UST on the east margin of Turnpike Road (see Figure 3) The well will be mobile i drilled and sampled at 5-foot intervals to a depth of 40 feet bgs At this point a grab augers water sample will be collected with a bailer from the interiorof the augers The water equlpme sample will be analyzed by a local certified laboratory within two hours of collection each san Meanwhile, soil samples will be collected below 40 feet at 5-foot depth intervals to a total depth of 80 feet bgs At least two hydropunch groundwater samples will be The can collected between 40 feet and 80 feet bgs at intervals determined by the lithology and MW4, 11 certified laboratory results from MW4 If the certified laboratory results from the grab be comp water sample collected at 40 feet bgs show the upper aquifer to be uncontaminated at to a dep MWS, then the augers will be left in place while the hydropunch water samples collected previouE between 40 and 80 feet bgs are analyzed by a certified laboratory within 24 hours match tr upper aquifer is shown to be contaminated at MW5, then If the the boring will be grouted with neat cement and c5% bentonite from total depth of the boring to 40 feet bgs The upper Relative 40 feet of the boring will then be completed with 2 " diameter machine slotted PVC interval; casing from 40 feet to 20 feet bgs and blank PVC casing from 20 feet bgs to surface The samples (lect certified results from the hydropunch water samples collected below 40 feet will be used collectei to determine the lower screening intervals for a future well to be drilled in the vicinity of Californ MWS (if the upper aquifer is contaminated) or to complete the entire 80 foot well with of odor, multiple screening intervals if the upper zone is not contaminated Specifications for the total va multi-chambered casing used to screen multiple intervals are included in a following EV ]am] section of this workplan Ground, Monitor well MW4 will also be drilled following the completion and receipt of certified using h. laboratory results from monitor well MW4 Monitor well MW6 will be located southeast desired of the former UST on the east margin of Turnpike Road (see Figure 3 The s through procedures and contingencies described for the drilling and completion of MW5 above formatio will be applied to the installation of MW6 screener decanter Monitor well MW7 will also be drilled following the completion and receipt of certifed water sa laboratory results from monitor wells MW4, MW5, and MW6 Monitor well MW7 will be located west and hydraulically upgradient from the former UST on the western edge of SOIL A the property (see Figure 3) If the certified laboratory results from MW4, MW5, and MW6 indicate that the zone between 50 and 80 feet bgs has not been contaminatey d b The soi releases from the former UST then MW7 will be drilled to a depth of 40 feet bgs b -foot intervals The monitor well will be completed with 20 Teflon l samples will be collected at 5 be label feet of 2-inch diameter PVC machine slotted casing from 20 feet to 40 feet bgs If the Each la certified laboratory results from MW4, MW5, and MW6 indicate that the zone between 4 ARC PUMP -WKPLN- 9128199