Laserfiche WebLink
.r r <br /> Ripona Market • 0 <br /> Subsurface Soil & Groundwater Investigation II <br /> Page- 3 <br /> wells will surround the former tanks and fuel island to demonstrate the Iateral limits of <br /> the soil and groundwater contamination on site One of the wells will be located in the <br /> suspected down gradient direction to the east Underground and overhead utilities <br /> information gathered prior to drilling may effect the actual boring locations <br /> A maximum of three soil samples will be obtained from each boring for laboratory <br /> analysis and will include a sample from the capillary zone and any apparently <br /> contaminated areas above or below groundwater All wells will be surveyed for elevation <br /> so that a gradient can be determined <br /> A Technical Report, which documents and discusses all of the activities and laboratory <br /> data involved with the project to date, will be generated at the conclusion of the project <br /> The report will include an executive summary of the investigation activities and results, a <br /> tabulation of all soil and groundwater data, graphical representation of the geologic and <br /> chemical results, a diagram of wells within a 2000 foot radius of the site, laboratory data <br /> sheets, and any recommendations for further work if data warrants it The report will be <br /> endorsed by the licensed professional responsible for the work <br /> 2.1 Drilling <br /> Permits will be obtained as necessary for all wells (including borings) before <br /> drilling begins The soil boring will be accomplished using a mobile mounted <br /> drilling rig employing the use of a hollow stem flight auger no less than 3 I/4- <br /> inch i d and 8 7/8 o d <br /> All drilling equipment will be thoroughly steam-cleaned before drilling begins, to <br /> prevent the introduction of contamination from off site, and between borings to <br /> prevent cross contamination <br /> The borings will be logged under the direct supervision of a registered <br /> professional using the Unified Soil Classification System The color, texture, <br /> moisture, plasticity (if applicable), consistency of the earth materials, pertinent <br /> soil or bedrock characteristics, and any evidence of contamination will be noted <br /> All water-bearing zones and the depths at which they were encountered will be <br /> noted on these logs <br /> All borings will be drilled in such a manner as to prevent cross contamination <br /> between strata Exploratory soil borings within the unsaturated zone will be <br /> backfilled with Bentonite and cement Borings into the saturated zone will be <br /> drilled to a maximum of 20 feet beneath the top of the aquifer being explored <br /> Any perching layers encountered will be investigated to a maximum thickness of <br /> 5 feet and will be backfilled with cement slurry, after a Bentonite seal has been <br /> placed If a deeper aquifer is to be investigated, conductor casing will first be <br /> grouted into place to seal off the upper aquifer(s), in series, if necessary, and <br /> drilling will proceed through the conductor casing after the grout has been <br /> allowed to set properly If evidence of contamination is noted during the drilling, <br />