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07-17-91 Workplan for three soil borings/monitoring wells received and reviewed by PHSIEHD this <br /> date. <br /> 08-15-91 Three monitoring wells installed at the site. <br /> 08-19-91 PHSIEHD researches septic-no permit for septic system, but not hooked up to city sewer <br /> either. A private septic system on-site was determined to exist. <br /> 10-15-91 PHSIEHD receives 10-09-91 Woodward-Clyde report on the installation of the three <br /> monitoring wells at the site.' The wells were installed within approximately 10 feet of the <br /> former tank pit cavity to the west, south, and east. The soil results are below: <br /> >rnm, Taro. <br /> TM Mt G=z Tol.i1UM SOCOM XYLEM Pb <br /> b•e" W4► W4► W�v 4�►w► �� <br /> <s <br /> t74.6-75.0 <br /> 63 <0.5 33 9.T <br /> t.4 <0� 30 <3 <3 <br /> s.a <4s <s <3 <s <s4<3 <5 <3 <s 7.3 <br /> 0.6 <0.5 <3 CS T.6 <br /> 1.0 <0.] 6 <3t5 <3t3 <36,0 <0.] <3 <] 27C 5.5 <br /> 1.5 <0.5 11 42 3376 <br /> 6.0 <br /> <O.S <br /> <3 <3 <5 <] 2 S I <br /> No recommendations for further work were included in the report. <br /> 11-12-91 PHSIEHD sends letter to RP requesting quarterly monitoring at the site and further <br /> delineation of the soil and groundwater contamination and the former piping runs, and <br /> asks for a WP to a submitted by December 12, 1991. <br /> 12_17-91 PHSIEHD receives a letter requesting an extension for the submittal of the WP until April <br /> 1992 to allow for two quarters of groundwater sampling at the site. <br /> 02-27-92 PHSIEHD receives fourth quarter 1991 quarterly report. Groundwater was measured and <br /> sampled on December 31, 1991. Groundwater flow direction was to the south. Depth to <br /> water was approximately 77' bgs. All three wells showed contamination with MW#2 <br /> showing the highest levels. Lead was not detected in the wells. <br /> Groundwater was measured and sampled on August 20, 1991. Groundwater flow <br /> direction was to the northeast with a gradient of 0.0009ft1ft. All three wells showed <br /> contamination. Lead was not detected in the wells. <br /> 06-17-92 PHSIEHD receives first quarter 1992 quarterly report with included results of groundwater <br /> monitoring and sampling conducted on March 30, 1992, the total and soluble lead <br /> analytical results of soil samples collected from varying depths from the tank pit area, and <br /> a proposal to remediate the soil and groundwater at the site. <br /> 1 For historical groundwater analytical results. please refer to end of chronology. <br />