Laserfiche WebLink
Lu"'M C, Nrnnvr,Jr. <br /> IJv:nNwHOD>•1" ' <br /> � srcun n;. roti <br /> ravnmrr.+r:ra Nregr:no:- <br /> cairsowr+r. <br /> Water Beards <br /> Gentra� ValieY F,egionai water Gluality Control Board <br /> TO. Shelton R. Gray _._.. <br /> Senior Engineering Geologist <br /> FROM: C. Dean Hubbard ------ <br /> Engineering Geologis �1 <br /> DATE: 18 April 2012 <br /> R ACTION REQUIRED DETERMINATION, CATELLUS PROPERTY, <br /> S <br /> UBJECT: NO FURTHE <br /> TRACY, SAN JOAQUIN COUNTY <br /> Rationale: The area of crude oil affected soil and groundwater a the <br /> oval areas of total historical <br /> pipelines has been delineated on the Catellus project (S roximate depths of <br /> petroleum hydrocarbons as crude ell bTPHc) were s . Affected soil isin shallow soil,definedbeneathra and/or within, the historical <br /> 5 to 13.5 feet below ground surface ( g ) the Union Pacific <br /> Old Valley Pipeline (OVP) and Tidewater Associated Oil Company (TAOC) pipelines, <br /> Railroad (UP track right-of-way easements, and beneath <br /> vacant and/or grst Byron c agricultural ladnd soil <br /> Presently, <br /> groundwater has been defined extending offsite to adja <br /> the Site is undeveloped, but is designated Urban Reservel4 in the lCcommer Tracy's <br /> andGe offices lPl near he <br /> General Plan notes the project area will be developed f <br /> or Interstate 205, with some low density residential uses further Trom the Interstate- <br /> of 440 milligrams per kilogram <br /> The extent of crude oil affected soil onsite is defined by analytical results <br /> to 24,000 mgikg to depths up to 13.5 feet bgs, abolatter <br /> t$�ov�0 feet bgslue . Analyticales with results for <br /> (mg/kg) <br /> phase crude oil noted in soil from the same boring from <br /> samples from approximate depths of 15 feet to 39 feet bgs were non-detect (ND) for TPH compounds, <br /> which defines the vertical extent of affected soil. <br /> f about <br /> Laterally, the extent of affected soil is defined for three ed within/beneath o four areas wl <br /> he ualityecor dornsions oright-of-way <br /> 200 feet across to 250 by 350 feet, generally , o neo <br /> easements described above. The fourth area, on the southeast extendin e offsite to nd of the Chef northeast to an adjacent <br /> 300 by B00 feet, primarily beneath the easements, an 9 <br /> agricultural field. Fuel fingerprint evaluation <br /> confirmecrude d thTe pea active <br /> refined petroleum rp product pipelines <br /> consistent with degraded San Joaquin Valley <br /> wo <br /> are present within the easements on the northeast side of the highway and railroad <br /> of affected ssoil, extending <br /> The area of impacted groundwater overlaps with, and is larger than the are <br /> as slightly offsite to the southwest, but primarily d fromrse erai upgradient to the t and,c osslaowngraater d enpstep- <br /> les <br /> were collected and submitted for TPH analysis <br /> out borings. The analytical results for TPH <br /> the lateral sex ent of the crdid not dude oil afflected environmental <br /> groundwater, <br /> screening levels, or were ND, which define <br /> e Applications <br /> Chevron Environmental Management Company's (Chevron) consultant, Science <br /> that the <br /> International Corporation Energy, Environmental & Infrastructure, LLC [SAiC]), <br /> petroleum hydrocarbons detected in soil and groundwater�tbekyoe�' eeodoal pons <br /> of crude oil remaining at the Site will naturally deg ` �meelveprif seeal yea <br /> and are not anticipated to pose an unacceptable health risk. <br /> ICAP._ = _Utvv. CacD, F'.F.. LHA1F ! RAIvIElF C,, CREEDON P.L 8vEF. rn3WTW-_ O-rrCEr' <br /> rj376c w•vv:walerDaarCs <br /> 5rree: Fresro GA ca.aovlcen:rarvalre, <br /> Vr r- .. <br />