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E Products, Inc. <br /> Environmental Services Proposal <br /> Page 2 <br /> northeast corner of the station building) to determine if <br /> contamination migration from these areas could be <br /> impacting the sanitary sewer. <br /> 1.b.) The third test boring (TBV"3) should be advanced in the <br /> grassy area west-southwest of the pump islands, to define <br /> the magnitude of contamination within the soils of this <br /> area. <br /> 2). Field screen test boring samples with a flameionization detector <br /> and laboratory analyze one soil sample per boring for BETX, <br /> AL ME, and THGAS -parameters to document levels of petroleum <br /> contamination to soils. <br /> 3). Because there is evidence that groundwater is impacted, we will <br /> convert test boring (TB) #2 to a flush thread PVC screened <br /> monitoring well to define the extent and impact of contamination <br /> to the uppermost unconfined aquifer. Based on existing site <br /> information, it appears that this well should be completed near <br /> grade. <br /> • 4). Stabilize monitoring well and sample for levels of petroleum <br /> hydrocarbons and other volatiles as outlined by the MPCA. <br /> Collect water elevation (from this well plus other 5 on site) data <br /> on least two dates to plot groundwater samples per MPCA <br /> guidelines for Remedial Investigation: first round MDH 465D <br /> DRO, VOC's, MME, and dissolved lead. ' <br /> 5.) Complete well recovery rate (slug test) tests on at least two of <br /> the monitoring wells, and complete a sieve analysis on at least <br /> one soil sample representative of the aquifer soil to provide <br /> information for the consideration and possible design of a <br /> corrective action system. <br /> 6.) Conduct a health risk assessment which gathers information on <br /> known and potential impacts to public health and the <br /> environment, including an area well search and a utility conduit <br /> vapor survey. <br /> 7.) Prepare a limited report according to MPCA Remedial <br /> Investigation (RI) Report guidelines, including the section on <br /> proposed corrective actions. If conclusions indicate that "no <br /> action" or "continued monitoring" position is justified as <br /> corrective action, the RI report will be completed within this <br /> scope of service. If conclusions are that a Corrective action <br />