02-14-1994 Council Packet - Laserfiche WebLink

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City of Oroao Public Works Depafljaent Project No. CMKX-93-0163 January 28. 1994 Fife 3 B.2 Soil Borinc Investigntioa Braun IntertK conlucted seven penetratkm test borings duriog Novembv and Decenri>er, 1993. Please see Figure 3 in Appendix A for the fonner soil boring (ST-1 through ST-7) locations. Three soil borings were conducted in the area of the fonner 3,000- gallon unleaded gasoline UST basin and four were conducted in and around the area of the fonner S60-gallon diesel fuel UST which was suspected ti) have leaked. Laboratory analysis of soils collected from diese soil borings indicated the possiMe cofttamination of groundwater. C.Scope of Work Braun Intertec prc^>osa the following scope of work to address the petroleum contaminated soil surrounding the former 3,(X)0-gallon unleaded gasoline and 560-galIon diesel USTs described above, and to address the potential groundwater contamination which may be present at this site: Monitoring well permits will be t^tained prior to drilling aaivities. •Drilling four soil borings, one approximately 20 feet south of the fonner 3,000-gallon unleaded gasoline UST and three in the area of the 560-gallon diesel UST. The soil borings would extend approximately seven feet below the water table (25 feet below ground surface; groundwater was determined to be approximately 18 feet belo v ground surface during the initial soil boring program). Collecting soil samples at 2.5 foot vertical intervals using a split-spoon sampler. Field-screening soil samples for the presence of organic vtq^ using a PID or HD. Collecting a maximum of two soil samples from each boring for laboratory analysis. Sod samples for laboratory analysis will be collected from the depth interval yielding the highest PID reading and/or from the depth interval immediately above the apparent water table. Analyzing a minimum of one soil sample from the boring performed in the area of the former 3,0(X)-galIon unleaded gasoline UST for benzene, ethyl benzene, toluene and xylenes (BETX), methyl tertiary butyl ether (MTBE), gasoline range organics (GRO) and percent total solids. For cost estimating purposes, it is assumed that only the sample from the water table interface from this boring will be analyzed. Analyzing a minimum of three soil samples from the borings performed in the area of the former 560-gallor. UST for benzene, ethyl benzene, toluene and xylenes (BETX), diesel range organics (DRO) and percent tot^ solids. For cost estimating purposes, it is assumed that only the sample from the water table interface from each boring will be analyzed.