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California *tonal Water Quali Co <br /> V nt* Board :.� <br /> Central alley Region ; <br /> Linda S.Adams Kar] E. LoragI ScD P :u ' <br /> Secrelaryfor E,Chair <br /> Environmenra! Fresno Branch Orrice •���N°Y <br /> Proleclion 1685 E Street,Fresno,California 93706 Arnold <br /> (559)445.51 16•Fax(559)445-5910 Schwarzenegger <br /> h ttp:/hvww,wa terboards.ca.gov/cen tralva I ley Governor <br /> 31 July 2007 <br /> 1D <br /> A!I <br /> M. Scott Mansholt ' 'fiUd;,;r Vlll ,. <br /> Chevron Environmental Management Compan <br /> 6001 Bollinger Canyon Road y J <br /> Rm K2066 <br /> San Ramon, CA 94583.2324 <br /> REVIEW OF REVISED SOIL AND GROUNDWATER WORKPLAN, <br /> SITE #6, WICKLUND ROAD AT W. 13YRON ROAD, MOUNTAIN MOUNTAIN HOUSE <br /> COUNTYHOUSE, SAN JOAQUIN <br /> Regional Water Board staff has reviewed the referenced workplan, date <br /> d 13 Jsubmitted by Science Applications International Corporation (SAIC) on behalf my 2007 <br /> hevr and <br /> of Chevr <br /> The project is in the community of Mountain House on West Byron Road a on. <br /> feet northwest of Wicklund Road. Regional Water Board staff approved SAppraximatell 700_ <br /> IC's original <br /> project workplan on 13 April 2005; an amended SAIC workplan requesting removal <br /> tertiary butyl ether (MTBE) from the analytical suite was a pproved on 6 Mof methyl <br /> March 2006. <br /> According to our files, the initial discovery of petroleum hydrocarbons in soil was confirmed <br /> attributable to leaks from the Old Valley Pipeline (OVP) and/or the Tidewater Associated Oil <br /> Company (TAOC) pipelines that had existed on the site. Mountain House Site #6 <br /> encompasses an approximate length of 1,000 feet and at this time as much as 200-feet wide. <br /> Two refined products pipelines (Kinder Morgan Energy Partners and Bay Area Products Line) <br /> are located within the former OVP/TAOC right-of-way corridor. The Union Pacific Railroad <br /> right-of-way (ROW) runs along the eastern property boundary. <br /> During an investigation by Condor Earth Technologies, Inc. (Condor) in 2001, crude oil- <br /> affected soil and groundwater were encountered. Condor's investigation indicated elevated <br /> concentrations of petroleum hydrocarbons present in at least six soil borings. Total petroleum <br /> hrdrvcarbans as crude oil (TPHc) in soil was encountered at depths of 4.5 to 20-feet with <br /> TPHc concentrations reported as high as 29,000 mg/kg. <br /> Total petroleum hydrocarbons as diesel (TPHd) was reported in groundwater samples at <br /> concentrations as high as 260,000 micrograms per liter ( ) <br /> /L ; TPH as gasoline (TPHg) was <br /> reported as high as 9,900 pg/L; BTEX compounds were ND. Depth to groundwater is <br /> between 7 and 17-feet. <br /> calfornia Environmental Protection Agency <br /> Co Recycled Paper <br />