Laserfiche WebLink
*4d <br /> Mr.Michael Infurna,SJCEHD April 7,2006 <br /> Well Installation Work Plan <br /> Palisades Station No. 835,Stockton,CA <br /> Page 2 <br /> In March 1994, single-walled gasoline underground storage tanks (USTs) used to store <br /> gasoline (one 6,000-gallon capacity, one 8,000-gallon capacity, and one 10,000-gallon <br /> capacity), and the gasoline product lines and fuel pump islands were removed from the <br /> northeastern portion of site. A waste oil UST, formerly located in the northwestern <br /> portion of the property, was also removed at this time. Double-walled fiberglass USTs <br /> (one diesel and one gasoline) were subsequently installed in a new cavity located in the <br /> east central portion of the site. A new fuel dispenser island, located in the southeastern <br /> portion of the property, was also constructed. The locations of the former and current <br /> USTs and pump islands, and the configuration of the facility, are shown on Figure 2. <br /> SITE VICINITY <br /> Motor vehicle fuels were also released to the subsurface at 2725 Country Club <br /> Boulevard, an active 7-11 service station (#14117) situated immediately west of the <br /> Palisades service station. Soil and groundwater beneath this 7-11 facility are impacted <br /> with total petroleum hydrocarbons as gasoline (TPHG), benzene, toluene, ethylbenzene, <br /> and xylenes (BTEX), methyl tertiary butyl ether (MTBE), and tertiary butyl alcohol <br /> (TBA). The location of 7-11 station#14117 is shown on Figure 3. <br /> A Shell station formerly operated at 2575 Country Club Boulevard, approximately 450 <br /> feet east of the site. Soil and groundwater beneath this property are also impacted with <br /> TPHG, BTEX, MTBE, and TBA. A pump and treat groundwater remediation system is <br /> currently being operated on behalf of Shell. The location of this former Shell station is <br /> illustrated on Figure 4. <br /> BACKGROUND <br /> The following discussion was based on a review of available records at SJCEHD. <br /> Subsurface petroleum hydrocarbon impact was initially reported at the site in September <br /> 1991, and Exxon (now ExxonMobil) was named as the responsible parry for a fuel <br /> release at this time. All previous environmental assessment and remediation activities at <br /> this site were completed on behalf of ExxonMobil. Stratus has conducted quarterly <br /> monitoring and sampling of groundwater since the third quarter 2005 on behalf of <br /> Palisades. <br /> In July 2002, SJCEHD filed an Unauthorized Release Report(URR), naming Palisades as <br /> the responsible party for an additional subsurface fuel release at the site. The July 2002 <br /> URR was filed following a significant increase in dissolved MTBE concentrations at a <br /> well situated in relative close proximity to the UST complex. Following completion of <br /> an Enhanced Leak Detection test in April 2003, SJCEHD filed an additional URR <br /> (May 2003) naming Palisades as the primary responsible party for the subsurface <br /> petroleum hydrocarbon impact. <br /> KAUSA Gasoline\0835\Work Plans\palisades835 workplan2006.doc STRATUS <br />