FIELD DOCUMENTS - Laserfiche WebLink

Home Browse Search

Roberts Petroleum Service Facility Project No. 1628G BACKGROUND September 7, 1989 Page 2 The site, located in an area of commercial development, is currently used as a bulk oil plant which distributes petroleum fuels. It is occupied by a warehouse; above -ground storage tank farm consisting of five tanks; a transfer block and loading area; and an underground storage tank farm consisting of four tanks. The locations of on-site structures are shown on Figure 2. In April 1985, J.H. Kleinfelder & Associates (Kleinfelder) installed a groundwater monitoring well (MW -1) adjacent to the transfer block. Petroleum hydrocarbon contamination was detected in the soil samples collected during the well construction and free -phase hydrocarbons were present on the groundwater surface. Diesel fuel was the suspected contaminant. Kleinfelder installed three additional groundwater monitoring wells at the site in July 1985. No petroleum hydrocarbon contamination was detected in the new wells but free -phase hydrocarbons remained in well MW -1. EES then followed up Kleinfelder's investigation by collecting groundwater samples from the four wells in March and April 1988. Free -phase hydrocarbons were detected in well MW -1 and dissolved hydrocarbons in well MW -4. In January 1989, EES installed three additional groundwater monitoring wells, designated MW -5, MW -6, and MW -7, within the site boundaries. Laboratory analyses of the groundwater from all of the wells, except MW -1, revealed that contamination was present in wells MW -3, MW -4, MW -5, and MW -6. Well MW -1 was not sampled because it was dry at that time. In April 1989, Roberts Petroleum Services contracted EES to conduct a quarterly monitoring program. Groundwater samples collected at that time from all wells, except MW -1 were reported by the laboratory as "Below the Reporting Limit." MW -1 was still dry.