SITE INFORMATION AND CORRESPONDENCE

Home Browse Search

�./ N--J was not analyzed. SOIL RESULTS MW#4, MW#5, MW#6 9192 (ppm) TPH-G SURR. REC % B T E X SURR. REC FMW#4-30 <0.065 69% <0.0026 68% MW#4-40 <0.064 77% <0.0026 72% MW#5-30 <0.068 59% 10.00098 (B)/<0.0027 61% MW#5-40 <0.064 53% <0.0025 63% MW#6-30 <0.057 73% <0.0023 78% MW#6-85 <0.064 63% <0.0025 65% The report proposes to change the remedial efforts from soil vapor extraction to excavation of the former tank pit cavity to approx. 40' bgs, based on the results of the latest soil sampling from this area. 11-20-92 A meeting was held this date with PHS/EHD, the RP and the consultant for the RP to discuss the proposal to excavate the contamination and monitor the site wells for two quarters. PHS/EHD firmly states that the groundwater contamination must be cleaned up to nondetect levels, if feasible, and that some other form of remediation may be more cost effective to cleanup both the soil and the groundwater in the long term. The RP was told by the consulting firm that after the excavation and two quarters of sampling, they will recommend, and receive, regulatory closure. PHS/EHD responded that a regulatory closure would not be warranted until all issues were addressed and the groundwater contamination remediated until no further threat to groundwater is achieved. 12-07-92 PHSIEHD initiates the public participation process for this site in response to the proposal to excavate the soils at the site. 12-09-92 PHS/EHD sends letter to RP stating that over-excavation will likely remove the bulk of the contaminated soil at the site, but that the soil in the zone deeper than that to be excavated, and the soil in the "smear zone" must be characterized and addressed in future remediation efforts. The letter states that the contamination noted in the former septic pit (MW#4) must also be addressed and emphasizes the importance of proper laboratory QC data and detection limits. 01-13-93 PHS/EHD sends letter to RP stating the public participation period was completed and the proposed work can be scheduled to begin. 02-10-93 PHS/EHD receives the fourth quarter 1992 quarterly report which reports the monitoring and sampling of all six site wells on December 30 through 31, 1992.1 The depth to water was approx. 77.8' to 80.65' bgs with the flow direction to the south east. MW#2, MW#3, 3 For historical groundwater analytical results, please refer to end of chronology. S