ARCHIVED REPORTS XR0011355 - Laserfiche WebLink

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1 8020) Samples submitted to the laboratory under the (COC) will be analyzed for total petroleum hydrocarbon products (in the gasoline range) by modified EPA Method 8015, minimum detection limit 1 mg/kg and Benzene, Toluene, Ethyl Benzene, Total Xylene EPA Method 8020, minimum detection limit 3 ug/kg All of the bonngs will be grouted with neat cement and finished otf to grade All decontamination water will be contained in D O T 17 Steel drums and stored on site until proper disposal methods are determined The installation of the 2" diameter monitoring wells will be completed by a truck mounted hollow stem drilling ng The outside diameter of the hollow stem is 8 0 inches The soil sampling interval for this task and the laboratory analysis will be the same as in the hand bonngs stated above The overall depth of the proposed monitoring wells will be approximately 25 feet Ten feet of Schedule 40 P V C blank followed by fifteen feet of a Schedule 40 P V C screening interval will complete the monitoring well The screening interval will be of 01" blot size and will be placed so that 5 feet of screen will be above the water and 10 feet below the static water level The exact depth and or location of the well screen will be determined in ,the field by the on site geologist, during the drilling of the monitoring well The well screen packing material will be of MontereySand #2 for the entire screening interval and two feet above where a bentonite plug will be installed Then a bentonite/cement seal will be tremmied up the annulus of the boring to the surface A waterproof Christy box will be installed to protect and seal the access to the well along with a locking watertight well cap Development of the wells will be completed by surging and pumping techniques within 48 hours of the installation of the well to remove the fines and sediments during installation and establish a efficient conduit for monitoring the aquifer The wells will then be allowed to stabilize for 24 hours Upon returning, a detailed monitoring well log will be initiated for each monitoring well The wells will then be screened first for the presence of volatile aromatics with a portable photoionization detector (Thermodyne 580B) at the well head and these measurements will be recorded To determine if floating product is present a product interface meter will be used to detect any undissolved free floating product During the previous two activities, the wells will 5