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%moor <br /> The total and soluble lead analytical results for the samples collected from the former tank <br /> pit are shown below, <br /> Sr Pfe Nis D"Ch(n) Tell Lead WET <br /> ILaci iadi (_ihd Lead <br /> (uWL) <br /> A-0 7l3a92 —14 7-3 191' <br /> A-2 3130/92 —16 6.1 NT <br /> B-0 1!30/92M-2014 <br /> 10 Np <br /> H-2 3130/91l t.4 <br /> C-o-2 3n 21 NT <br /> C-2.4 3/OM5 1.4 <br /> C-" 3/301920 0.5 <br /> C4-8 3/301924 0.39Ob2 3/30192A 0„S6D�2a 3130/926 0.453!30!92 1.1D-6-8 U30N2 0.95 <br /> Based on the low to nondetectable results of the soil samples from the installation of the <br /> three monitoring wells, the quarterly report proposes to backfill the tank pit area, install <br /> one vapor extraction well in the middle of the tank pit and use soil vapor extraction <br /> technology to remediate the site. <br /> The three wells were monitored and sampled on March 30, 1992.2 The depth to water <br /> was approx. 74.5' bgs with flow to the north east. All three wells showed contamination. <br /> 07-10-92 PHSIEHD sends letter to RP stating stockpiled soil can be used as backfill as site will be <br /> remediated in-situ, that the WP may be submitted in the next quarterly status report and <br /> must include a proposal for the removal of the remaining piping at the site. <br /> 08-10-92 PHSIEHD receives the second quarter 1992 quarterly report showing the results of <br /> sampling that occurred on June 30, 1992- The approx. depth to water was 80.5' bgs with <br /> flow to the north east. Only MW#2 showed contamination at this sampling event. <br /> 09-02-92 PHS/EHD receives an "Advisory Workplan" from a new consulting firm, dated 08-31-92. <br /> The workplan proposed to install three additional wells, to remove and sample beneath <br /> all existing piping, to obtain additional bottom and sidewall samples from the former tank <br /> pit area and, based on the results of these soil samples, to either install shallow vapor <br /> extraction casing within the former tank pit area and backfill or backfill the tank excavation <br /> and drill a horizontal vapor well as previously proposed. <br /> 11-16-92 PHSIEHD receives the third quarter 1992 quarterly report dated 11-13-92. The report <br /> shows the results of the monitoring and sampling of the existing three wells and the newly <br /> installed three wells. It also reports the results of the soil samples from the former tank <br /> pit area and the piping runs where the additional piping had been removed and proposes <br /> changes in the proposed remedial alternative. <br /> The six wells at the site were monitored and sampled on October 15 and 19, 1992. The <br /> 2 For historical groundwater analytical results, please refer to end of chronology. <br /> 3 <br />