ARCHIVED REPORTS XR0000109 - Laserfiche WebLink

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1, 1 •k Page 2 ' Ms Margaret Lagono February 21, 1997 ' The developed portion of the facility consists of approximately seven acres, is relatively flat lying, and is almost entirely covered with asphalt and concrete The main facility ' building covers approximately two acres. An approximately 1,000-foot-long stormwater drainage ditch extends westerly from the facility to an intermittent, south-flowing drainage canal This canal flows into the intermittent Duck Creek, which is located approximately 900 feet south of the plant 1 The facility previously had four petroleum hydrocarbon underground storage tanks (USTs) (see Figure 2, Site Plan) The former 10,000-gallon diesel-fuel tank and two ' 6,000-gallon gasoline tanks were located near the southwest corner of the main building A 20,000-gallon diesel-fuel tank, was located beneath the parking lot on the east side of the facility (see Figure 2) ' The gasoline tanks near the southwest building corner were removed in April 1987 The westernmost gasoline tank failed a tank integrity test in December 1986 The easternmost 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 USTs in 1987, of which approximately 120 cubic yards were impacted by gasoline The soil was 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 installed wells MW-6 ' and MW-7 in February 1990, and MW-8 in September 1990 In March 1994, Philip (formerly Burlington Environmental) installed wells MW-9 through MW-13 in five boreholes that were drilled at the facility ' Soil samples were collected from the Philip boreholes for chemical analysis Soil sample hydrocarbon concentrations were all below laboratory method detection limits with the exception of the 60-foot depth sample from borehole MW-13, which contained 10 micrograms per kilogram (µg/kg) of benzene This sample was collected at a depth dust below the groundwater table,and was probably contaminated by petroleum-impacted groundwater at that location IPhilip submitted a Remediation System Pilot Test Workplan, dated July 1, 1994, to the San Joaquin County Environmental Health Division describing proposed groundwater cleanup technologies These technologies include groundwater sparging combined with I soil venting Several sparge and vent wells have been installed to implement this remediation However, active cleanup has been postponed due to pending changes in related California remediation guidelines In Philip's October 28, 1996, quarterly monitoring report, Philip recommended performing intrinsic biodegradation analysis to evaluate the option of passive long-term monitoring versus active remediation E 121382112599714gtr96 doc