SITE HISTORY - Laserfiche WebLink

Home Browse Search

Site Background Information: Former Ocampo Property Page 3 of 6 soil sample 135-13 at a concentration of 1.9 mg/kg. TPH-g was detected in all three ground water samples at the following concentrations: 1,200 micrograms per liter (Ng/1)(134), 460,000,000 pg/I (65) and 12,000 pg/I (66). TPH-d was detected in the samples from B4 and B5 at concentrations of 160 pg/I and 14,000,000 pg/I, respectively. BTEX compounds were detected in all three ground water samples analyzed. The sample from B5 had the highest concentrations at 680,000 pg/I benzene, 1,500,000 pg/I toluene,420,000 pg/I ethylbenzene and 3,280,000 pg/I total xylenes. MTBE and lead were detected in the ground water sample from B4 at 4.6 pg/I and 480 pg/l, respectively. January & February 2004: On 29 January 2004 and 03 February 2004, three ground water monitoring wells (MW-1 through MW-3) were installed at the site; no petroleum hydrocarbons were detected at or above laboratory reporting limits in the soil samples collected from monitoring well borings. August 2005: On 22 and 23 August 2005, three soil borings (CPT-1 through CPT-3)were advanced on- and off-site (Figure 2) utilizing CPT technology. TPH-g was detected in ground water sample CPT3-68-72 at a concentration of 160 pg/I. BTEX compounds were detected in sample CPT3-68-72 atthe following concentrations: 7.2 pg/I benzene,6.7 pg/I toluene, and 9.0 pg/I total xylenes. Benzene was detected at a concentration of 4.7 pg/I in sample CPT3-87-90. The vertical extent of petroleum hydrocarbon-impacted ground water is undefined at the former UST location (CPT-3). Two soil samples were collected for laboratory analysis, one in the middle of HU2 (CPT3-65) and the other at the top of HU4 (CPT3-75). No petroleum hydrocarbons were detected at or above laboratory reporting limits. June & August 2008: On 24, 25, 26 June 2008 two ground water monitoring wells (MW-5 and MW-6) and two soil vapor wells (VW-1 and VW-2)were installed on-site near the former UST location. On 26 August 2008 one off-site ground water monitoring well (MW-4)was installed in the city sidewalk approximately 180 feet south of the intersection of East Taylor Street and Wilson Way Frontage Road. TPH-g , TPH-d, and one or more BTEX compounds were reported in all soil samples collected from boring MW5 except MW5-5 and MW5-10 at maximum concentrations of 3,900 mg/kg TPH-g(MW5-15), 330 mg/kg TPH-d(MW5-15), 14 mg/kg benzene (MW5-40), 230 mg/kg toluene (MW5-45), 78 mg/kg ethylbenzene (MW5-15), and 690 mg/kg total Advanced GeoEnvironmenlal,Inc.