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S8#3 was drilled adjacent to the septic leach pit and showed contamination at 26' BGS <br /> but only low levels of toluene at 31' bgs. <br /> S8#4 was drilled approx. 10' away from S8#3 to determine the lateral extent of the soil <br /> contamination noted in SB#3. A 26' bgs soil sample only showed low levels of toluene <br /> at this depth. <br /> TABLE 2 <br /> SUN&IARY OF SOIL AfYALYIICAL LABORATORY <br /> SEPTIC LFACH SYSTEM AREA RESULTS <br /> Detected Cancemradons(uV1Cg) <br /> September 1994 <br /> EPA EPA Method 9424 EPA Method no EPA Method am <br /> Method Rime Aromas$$1dr b Volany orpp Semi.VOW&organic I i <br /> Depth 419.1 hrdrocar4on• <br /> SAMPLE rt-bp TPH�` I :-Maaf� Nom, <br /> Smsme Tohteae xylme(s) &beaseae 13-Dr-A SyienHsl F,3eataoe aaahrhdmr <br /> 7 <br /> i <br /> 26 26 Od7.� 15007 od. 5d. � od. mem ody uds I i55 Sloa }505 4.4,_� <br /> 3I 31 ods I nd a odre iia Rdra 4, � 12 d,.4 .4. 443 adna <br /> 26 266.1 <br /> nd. I od od. �. td, ad. od, ad. 13 od. <br /> Sample Dale Mai 26,1994 <br /> R-04s-f­&b.Wr pomd 1%afm <br /> as - Moa Erb u in.L-rd or demmn mtd is mawW <br /> a- Na+ssh <br /> TPHG-Taal Peaelmm Hydr—near u Cwsalaa <br /> COW—=�for FPA Memod 416.1 ted}PA McWod SM ue sepscxaatl n-qigp—Pa kPmt IMV11t1. <br /> The results of the groundwater sampling conducted on the six site wells on June 9, 1994 <br /> showed no contamination in the wells with the exception of toluene in MW#6, 1,2 DCA in <br /> MW#2, and PCE in MW#4 and MW#6.$ The flow direction was reported as variable and <br /> no depth to water information was reported. <br /> The report also discusses the fate and transport modeling applied to the residual soils at <br /> the site, the potential effect of naturally occurring hydrocarbon utilizing bacteria that are <br /> present in the soil, and (as an addendum) the results of the "Simple Green" study. <br /> 08-26-94 PHSIEHD meets with representative of RP to discuss the above Report of Findings. <br /> 09-30-94 PHSIEHD receives a "Draft Summary of Investigation - Findings and Closure Report for <br /> the Major Mart Site" dated September 30, 1994. <br /> 10-04-94 PHSIEHD holds a Technical Review Committee (TRC) Meeting where the consultant <br /> presents the site for regulatory closure. <br /> 10-1494 PHSIEHD sends letter to RP with recommendations of the TRC. The letter asks for a <br /> summary of the historical data generated at the site, a mass balance determination for the <br /> soil contamination at the former septic leach pit area and a clarification on the mass <br /> balance of the soil contamination at the former tank pit area, additional more detailed <br /> lithological cross sections, modeling on the remaining soil contamination so that future <br /> depth to water may be evaluated, additional information of the potential sources of PCE <br /> and 1,2 DCA contamination, and the resampling of the site MWs using a purging method <br /> that will draw down sufficient water to obtain a representative water table sample. <br /> -or historical groundwater analytical results, please _efer to end of chronology. <br /> 1 <br />