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`, Subject: Clarifications And Ado�',dum v Reference: Facility Site Code: 19093 Date: January 24, 2008 Fv, Page of ` samples at 30 and 35 feet, EHD believes soil samples should be collected at 40 feet bgs and deeper to laterally delineate COC north of the source area. PSC agrees to move CPT -6 in a location along a north -south line with H11, H10, and H16. However, to fulfill the investigation objective of addressing the data gap of soil concentrations in the northern direction from the source of the release, L PSC would prefer to keep the location of CPT -6 close to the south line of the building to laterally delineate COC. In lieu of collecting soil samples in CPT -6 at 1 J 5 -foot intervals below 40 feet bgs, PSC proposes to use the MIP to vertically delineate impact to 100 feet bgs. A revised Figure 10 from the original Work �jN Plan showing the new proposed location for CPT -6 is included in the attached axy) Addendum. The Addendum presents a discussion on the revised CPT and MIP procedures. Two discrete soil samples will still be collected at 30 and 35 feet bgs to quantitatively assess the concentrations detected in H16. These samples will be t analyzed for COC. 4. ETIC proposes to advance CPT -7 approximately thirty feet northeast of + monitoring well MW -11 and down gradient of the source area and collect only grab groundwater samples. EHD approves the advancement for this boring and five adjacent borings for collection ofdepth-discreet grab groundwater samples. PSC proposes to use MIP at CPT -7 to better define COC and lithology. As previously mentioned, the Addendum presents a discussion on the revised CPT and MIP procedures. D a.. 5. Soil and groundwater samples will be analyzed for total petroleum hydrocarbons quantified as gasoline (TPH-g); benzene, toluene, ethyl benzene, and total Xylenes L (BTEA); methyl tertiary -butyl ether (MTBE), ethyl tertiary -butyl ether (ETBE), di - isopropyl ether (DIPS), tertiary amyl -methyl ether ('TAME), tertiary butyl alcohol { (TBA), and 1,2-dichloroethane (1,2 -DCA). y Soil and groundwater samples will be analyzed for the above COC list. The i requirements for soil or groundwater sampling and analysis in addition to what is proposed in this work plan will be based on the results of the CPT/MIP investigation, the analytical results of soil and groundwater samples collected, as well as, documented historical soil and groundwater concentrations. The data will i- be discussed in a revised Site Conceptual Model to be presented in the Remedial Investigation Report, as well as, future remedial investigation or corrective action plans. ol` 4 i a 1 PHILIP ENVIRONMENTAL SERVICES CORPORATION 210 West Sand Bank Road, Columbia, IL 62236 `. 1. (618)281-1543 Fax(618)281-7020