Laserfiche WebLink
w <br /> Ms Linda Turkatte <br /> October 31, 1995 <br /> Page 2 <br /> site on March 19 and 20, 1991 Subsequent to the collection of verification soil samples, the <br /> open tank pit was backfilled with clean pea gravel to five feet below grade The pea gravel was <br /> overlain by a fabric liner and the remaining portion of the pit was backfilled to grade with clean <br /> soil <br /> In subsequent investigations six soil borings were advanced in the vicinity of the former <br /> underground storage tank and converted to groundwater monitoring wells (MW 1 through MW6) <br /> The borings/wells were completed at depths of approximately 30 feet below grade to investigate <br /> and define the extent of hydrocarbon impaction in soil and groundwater The boring/well <br /> locations are shown on Figure 2 <br /> GROUNDWATER MONITORING AND SAMPLING <br /> Ground Zero personnel performed groundwater monitoring and sampling on September 28, <br /> 1995 Based upon the depth to water measurements in wells MW 1 through MW6, the water <br />. table elevation has increased an average of 1 45 feet since the last monitoring event on May 2, <br /> 1994 Groundwater monitoring data are summarized in Table 1 <br /> Groundwater beneath the site generally flows in a southeasterly direction with a gradient ranging <br /> from approximately 0 009 to 0 018 ft/ft (47 to 95 ft/mile) A potentiometric surface map for <br /> the September 28, 1995 monitoring episode is shown on Figure 2 <br /> Groundwater samples were collected from wells MW 1 through MW6 after purging and <br /> stabilization of physical parameters (pH, electrical conductivity, and temperature) Well purge <br /> logs are included in Attachment A <br /> LABORATORY ANALYSIS <br /> Groundwater samples were placed on ice and transported under chain-of-custody protocol to state <br /> certified Argon Laboratories Samples were analyzed for BTEX and TPHG by EPA methods <br /> 8020 and 8015 modified, respectively No xylenes or petroleum hydrocarbon constituents were <br /> detected above laboratory method detection limits Analytical results are summarized in Table <br /> 2 Laboratory reports and chain-of-custody documentation for samples collected on September <br /> 28, 1995 are presented in Attachment B <br /> groundzel1ajd1aw13QR1995 rpt <br />