Laserfiche WebLink
On August 13 & 14, 1990, RESNA (formerly WaterWork Corporation) drilled, logged, and <br /> sampled soil borings and installed a groundwater monitoring well around the former tank <br /> locations as shown on Figure 2 The monitoring well was installed in the approximate center <br /> of the former tank pit One soil boring (SBI) was drilled to 65 feet to determine if the zone Just <br /> ' above the water table had been affected by any hydrocarbon contamination Three soil borings <br /> ' (SB2, SB3 & SB4) were drilled to 30 feet, and the fifth soil boring was drilled to 80 feet below <br /> grade and subsequently completed as a groundwater monitoring well (MW1) <br /> ' Laboratory analysis of the soils directly beneath the previous tank pit indicated high levels of <br /> ' gasoline hydrocarbons at depths between 10 and 20 feet The concentrations of gasoline <br /> hydrocarbons dropped off significantly with depth due to the low permeability of the soils <br /> ' Monitoring well MW 1 and soil boring SB2 samples contained significant amounts of <br /> hydrocarbon constituents Soil samples collected from soil borings SB1, SB3 and SB4 contained <br /> ' trace to very low concentrations of gasoline range analytes Soil contamination is assumed to <br /> extend beneath the mausoleum adjacent to the former tanks locations In the analysis of the <br /> initial groundwater sample collected from monitoring well MW I elevated levels of petroleum <br /> hydrocarbon analytes were detected <br /> On February 21, 1991 and again on April 18, 1991 confirmation groundwater samples were <br /> tcollected for analysis from the monitoring well The samples were analyzed for BTEX and <br /> TPHG by EPA methods 8020/8015 Laboratory data sheets for the 1991 sampling and analysis <br /> ' are included in Appendix 11 <br /> ' Benzene was detected at 0 6 parts per billion (ppb) in the February 21, 1991 sample No other <br /> petroleum hydrocarbon analytes were detected above method reporting limits <br /> The April 18, 1991 sample was split and analyzed by both Sequoia and Applied Analytical <br /> ' Laboratories Benzene was again detected at 7 1 ppb (Sequoia) and 3 9 ppb (Applied) in the <br /> sample and no other petroleum hydrocarbon analytes were detected above method reporting <br /> limits <br /> ' R-021492 LF 3 <br />