Laserfiche WebLink
V <br /> M=Z MA <br /> �+ Working To Restore Nature <br /> On July 7-9, 1993, the former tank location was over-excavated to a depth of 18 feet below <br /> grade some soil and groundwater samples collected from the excavation on July 8-9, 1993 <br /> recorded concentrations of TPHg and BTEX above method detection limits. <br /> On July 12, 1993, an area 20 feet by 35 feet at the south end of the excavation was deepened <br /> to a depth of approximately 23 feet. In soil and groundwater samples collected on July 12, <br /> 1993 petroleum hydrocarbon analytes were present above method detection limits. According <br /> bo„ to the results of confirmation soil samples (WHF, August 1993) residual hydrocarbon <br /> contaminated soil is mainly confined to the north end of the excavation. The excavation was <br /> subsequently backfilled and paved with asphalt. <br /> 2.0 OBJECTIVES AND SCOPE OF WORK <br /> L <br /> The objectives of this investigation are to: (1) assess the extent of soil contamination and <br /> groundwater impact in the vicinity of the former underground storage tanks; and (2) to collect <br /> and analyze soil samples for development of a remediation plan for the stockpiled excavation <br /> soil, if needed. <br /> rr <br /> 2.1 Soil and Groundwater Assessment <br /> To assess the extent the of soil contamination in the vicinity of the former underground storage <br /> tanks and to assess the extent of groundwater contamination the following scope of work will <br /> be performed: <br /> o Supervise the installation of three soil borings to a depth of approximately 16 feet. The <br /> borings will be located on the west, northwest and northeast side of the tank <br /> excavation. <br /> `r o Supervise the installation of three additional soil borings to depths of approximately 30 <br /> feet. Complete these borings as monitoring wells. Two of the borings will be located <br /> � in the estimated downgradient and one will be located in the estimated upgradient <br /> direction from the former tank excavation. <br /> 60 o Two soil samples will be collected from each boring; one from the soil/groundwater <br /> interface; and one from areas which exhibit physical indications of contamination. <br /> Samples will be analyzed for benzene, toluene, ethylbenzene, and xylenes (BTEX, <br /> boo EPA Method 8020), and total petroleum hydrocarbons as diesel and gasoline (TPHd <br /> and TPHg, EPA Method 8015). <br /> V <br /> 3 <br /> L <br />