Laserfiche WebLink
Kennedy/Jenks Consultants <br /> needed based on sample recovery). Soil samples were analyzed for TPHd, TPHmo, total <br /> arsenic, and total lead. Additionally, the shallow soil sample from Boring OU4-S4 was analyzed <br /> for VOCs and SVOCs. Groundwater sampling was not proposed in these OUs. <br /> 2.1.4 Operable Unit 5 <br /> Sample locations were situated within each AOI of OU-5 to assess potential chemical impacts <br /> associated with former railway activities and former buried pipelines. The sampling program is <br /> summarized by AOI below: <br /> • AOI 9 — Shallow Soil: Twenty-eight soil borings were advanced on a 200-foot lateral <br /> grid throughout OU-5 to further assess the presence of arsenic and lead in shallow soil. <br /> Soil samples were collected from at least two depth intervals (generally 0 to 0.5 feet and <br /> 2 to 2.5 feet bgs, modified as necessary based on sample recovery), and analyzed for <br /> total arsenic and total lead. Groundwater samples were not collected from these soil <br /> borings. <br /> Three soil borings were advanced in the eastern portion of OU-5 near Central Avenue to <br /> assess the possible presence of petroleum hydrocarbon constituents in soil and <br /> groundwater. Soil samples were collected from these three borings based on <br /> observation of nonaqueous phase liquid (NAPL), visual evidence of staining, and <br /> portable photoionization detector (PID) readings. Soil samples were analyzed for TPHg, <br /> TPHd, TPHmo, and BTEX. Reconnaissance groundwater samples were collected from <br /> each of these three borings and analyzed for TPHg, TPHd, TPHmo, and BTEX. <br /> • AOI 10 — Boring B4 Area: Six soil borings were proposed at 50-foot lateral intervals in <br /> the western, southwestern, and northwestern directions from the previous borings <br /> installed in the vicinity of Boring B4 to further delineate the lateral extent of petroleum <br /> hydrocarbons in soil and groundwater. Three additional borings were proposed in areas <br /> where the highest concentrations of petroleum hydrocarbons were detected and in <br /> downgradient areas to assess the vertical extent of petroleum hydrocarbons in soil and <br /> groundwater. The locations of these soil borings are shown on Figure 4. Eight more <br /> borings were advanced in the AOI 10 area in January 2006 in response to observations <br /> and findings from the original nine borings. <br /> Soil samples were collected from each boring based on observation of NAPL, visual <br /> evidence of staining, and PID readings. Soil samples were analyzed for TPHg, TPHd, <br /> TPHmo, and BTEX. Additionally, three of the soil samples were submitted for petroleum <br /> hydrocarbon fingerprinting analysis; these samples were selected based on the <br /> presence of NAPL, visual evidence of staining, and PID readings. Reconnaissance <br /> groundwater samples were collected from each boring and analyzed for TPHg, TPHd, <br /> TPHmo, and BTEX. <br /> • AOI 11 —Vicinity of Trenches PTP5 and PTP9: Soil samples were collected from <br /> additional exploratory trenches in this area. Soil samples were analyzed for total arsenic, <br /> total lead, PAHs, and organochlorine pesticides (Trench PTP5 area only). Groundwater <br /> • samples were not collected. The final trench locations were adjusted based on <br /> location-specific conditions and observations during field activities. <br /> DRAFT Phase I Remedial Investigation Report Page 14 <br /> Former Tracy Railyard, Tracy, California <br /> g:Gs-groupladminyob10510565777.18_uprr109-reports\d rptltext.doc <br />