COMPLIANCE INFO_PRE 2019 - Laserfiche WebLink

Home Browse Search

15135 Eight Mile Road -2 - 1 October 2018 Stockton, San Joaquin County below ground surface (bgs). In August 1995, Condor Earth Technologies (Condor), on behalf of David Smith, advanced three borings, collected soil and groundwater samples from these borings, and detected concentrations of petroleum hydrocarbons in each of the soil and groundwater samples. In August 1996 Condor collected soil and groundwater samples from five additional borings, and based on the results of this sampling, in September 1997 Condor installed and began sampling one deep and three shallow monitoring wells. From 1998 to 2011, Condor and AGE collected surface water samples from the drainage ditch east of the release and from the drainage channel south of Eight Mile Road. During the period from 1998 and 2004, surface water samples collected from the ditch and channel contained up to 1,400 micrograms per liter(pg/L) of total petroleum hydrocarbons as gasoline, 1.4 pg/L of benzene, 30 pg/L of toluene, 2.3 pg/L of ethylbenzene, 118 pg/L of total xylenes, and 4,700 pg/L of methyl tertiary butyl ether(MTBE). Between 2005 and 2011, petroleum hydrocarbons were detected in only one of the 62 surface water samples collected from the Site. In September 2000, Condor advanced 13 additional borings to delineate the extent of petroleum hydrocarbons beneath the Site. SJCEHD oversaw the cleanup and investigation of the petroleum release at the Site until 5 January 2001 at which point, based on concentrations of MTBE detected in groundwater, SJCEHD deemed the release to be from the ASTs, not the USTs, and transferred oversight of the case to the Central Valley Water Board. On 2 April 2001, Central Valley Water Board staff closed the UST case and opened an AST case for the Site petroleum release. In August 2001, H&H retained AGE, replacing Condor as its environmental consultant. During December 2001 and January 2002 AGE advanced 10 soil borings across the Site to delineate the lateral and vertical extent of the MTBE plume in soil. In October 2002, AGE installed one groundwater extraction well, three shallow monitoring wells, and three deep monitoring wells. In December 2003, AGE installed one deep and three shallow monitoring wells. On 10 June 2004, the Central Valley Water Board Executive Officer issued a Notice of Applicability for Order No. 5-00-119, General Order for Discharge to Surface Water of Groundwater from Cleanup of Petroleum Fuel Pollution. The project was assigned General Order No. 5-00-11938 to regulate discharges of water from an on-Site groundwater and extraction treatment system (GWETS) into the drainage ditch east of the release; this ditch is hydraulically connected to the San Joaquin River. Between 2005 and 2009, AGE extracted and treated approximately 1,000,000 gallons of petroleum impacted groundwater and removed approximately 5 pounds of MTBE. H&H conducted monitoring for this interim remedial measure pursuant to Monitoring and Reporting Program (MRP) No. R5-2004-0828. On 23 May 2007, the Central Valley Water Board Executive Officer issued an Administrative Civil Liability Complaint (ACLC) to H&H assessing a $3,000 Mandatory Minimum Penalty for a discharge of tertiary butyl alcohol from the Site's GWETS to the adjacent drainage ditch; this discharge violated the Waste Discharge Requirements of General Order No. 5-00-11938. On 20 August 2007, H&H waived their right to a hearing before the Central Valley Water Board and paid the assessed ACLC. On 7 September 2007, AGE discovered that one of the Site's ASTs had been vandalized, causing an unauthorized release of petroleum. In October and November 2007 AGE excavated approximately 14.5 tons of petroleum impacted soil and pumped approximately 4,500 gallons of petroleum impacted groundwater to mitigate the petroleum release. Impacted soil was transported to Forward Landfill, located in Manteca, California, and impacted groundwater was treated on-Site using the GWETS.