Laserfiche WebLink
Mr. Joel Weiss <br /> February 15, 1996 <br /> Page 5 <br /> To further assist your evaluation of this modified remedial program, Table 2 (attached) lists <br /> analytical results from quarterly monitoring of the two existing monitoring wells on the site <br /> (MW-1 and MW-2; see Figure 1). Metals have been monitored for a total of five quarters <br /> (four quarters for MW-2). Lead has not been detected in ground water samples from either <br /> of the monitoring wells during any of the monitoring periods. The detection limit for lead <br /> during all but the initial monitoring period has been 0.0050 mg/L, which is one third of the <br /> current MCL for lead in ground water of 0.015 mg/L. If you require, to further document <br /> the lack of detectable concentrations of lead in site ground water, SPTCo/Terranext propose <br /> to collect ground water grab samples from temporary wells installed at the four locations <br /> shown on Figure 1. Given that the direction of ground water flow on the site is not <br /> characterized, the sampling locations were selected to encompass the area with greatest lead <br /> impact in soil. Location 2 is within the area where the highest concentrations of total lead in <br /> soil were detected. Samples from the proposed temporary wells would be field filtered and <br /> analyzed for lead with a detection limit of 0.0050 mg/L (EPA 7000 series). <br /> SPTCo/Terranext will not proceed with the modified remedial program without written <br /> approval from the Regional Board. Based on equipment availability as of this date, onsite <br /> treatment of soil can begin within one to two weeks of receipt of Regional Board approval. <br /> Treatment and backfilling are estimated to require approximately four to six weeks to <br /> complete. <br /> Mr. Randall Smith of SPTCo and I will call you next Tuesday or Wednesday (February 20 <br /> or 21, 1996) to discuss the revised remedial program. <br /> Sincerely, <br /> TERRANEXT <br /> co� /. <br /> Richard L. Bateman, R.G. <br /> Project Manager <br /> RLB/dao <br /> cc: Mr. Randall Smith, Southern Pacific Transportation Company <br /> 469-022.Itr/02-15-96/u/keydata/oldtracy/letters <br /> TerraNext <br />