ARCHIVED REPORTS XR0000116 - Laserfiche WebLink

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' Page 3 Mr Ron Rowe ' July 6, 1998 The gasoline tanks near the southwest building corner were removed in April ' 1987 The western-most gasoline tank failed a tank integrity test in December 1986 The eastern-most gasoline tank had previously been abandoned in place, prior to 1986, by removing the fuel and filling the tank with sand The two diesel- fuel USTs were removed in September 1989 Approximately 450 cubic yards of soil was excavated during removal of the two gasoline USTs in 1987, of which, approximately 120 cubic yards were impacted ' by gasoline The soil was allowed to aerate and be disposed of onsite with guidance from the San Joaquin Air Pollution Control District In July and September 1987, Environmental Science and Engineering, Inc ' installed three groundwater monitoring wells (MW-1 through MW-3) In January 1988, Anderson Consulting Group (ACG) installed wells MW-4 and MW-5 ACG later installed wells MW-6 and MW-7 in February 1990, and MW-8 in ' September 1990 Philip (formerly Burlington Environmental) installed wells MW-9 through MW-13 in March 1994 ' Philip submitted a Remediation System Pilot Test Workplan, dated July 1, 1994, to the San Joaquin County Environmental Health Division(SJCEHD) describing proposed groundwater cleanup technologies These technologies included groundwater spargmg combined with soil venting Several sparge and vent wells have been installed to implement this remediation However, engineered remediation activities have been halted due to natural petroleum hydrocarbon concentration reductions that have been observed at the site ' MONITORING ACTIVITIES ' Philip performed this quarterly groundwater monitoring event on May 21, 1998 Depth to groundwater and the presence or absence of phase separated ' hydrocarbons (PSH) were evaluated in each monitoring well PSH was not observed in any of the monitoring wells Groundwater samples were collected from monitoring wells MW-1, MW-5, ' MW-7, MW-8, MW-11, and MW-12, which are within or around the existing plume of petroleum hydrocarbon impact in groundwater Historic sampling results indicate that groundwater in other site monitoring wells are not impacted with ' petroleum hydrocarbons Groundwater sampling procedures are described in Attachment 3 Water sample field data sheets are presented in Attachment 4 Groundwater samples were submitted under proper chain of custody control to ' West Laboratory of Davis, California Samples were analyzed for petroleum compounds benzene, toluene, ethylbenzene, and total xylenes (BTEX), and for oxygenate compounds methyl-t-butyl ether (MTBE), tertiary butyl alcohol (TBA), di-isopropyl ether (DIPE), ethel tertiary butyl ether(ETBE), and tertiary amyl ,. methyl ether (TAME) using USEPA Method 8260 1 E 1121382/125997/2ndQtr98 doe 1