ARCHIVED REPORTS_XR0003159 - Laserfiche WebLink

Home Browse Search

i ' Site Background Information • R.M B. GARAGE (ERARDI VENTURES) ' 715 North Hunter Street, Stockton, California TPH-g, TPH-d and TPH-mo were detected in the soil samples collected from borings 131 through ' 134 at concentrations ranging from 0 38 (milligrams per kilogram) mg/kg to�8,100 mg/kg TPH-g, 400 mg/kg to 5,500 mg/kg TPH-d and 200 mg/kg to 9,200 mg/kg TPH-mo TRPH was detected in the soil samples collected from borings B 1 through B4 at concentrations as high as 36,000 mg/kg ' (B4-30) One or more BTEX compounds were detected in the samples collected from borings B 1 through 134, with the exception of the 15-foot soil sample from 133, at concentrations as high as 45 mg/kg benzene, 630 mg/kg toluene, 150 mg/kg ethylbenzene and 760 mg/kg total xylenes (B4-30) ' Seven additional volatile organic compounds were detected in the soil samples at concentrations ranging from 0 010 mg/kg to 440 mg/kg Fuel additives were not detected at or above laboratory ' reporting limits in the soil samples TPH-g and TPH-d were detected in the ground water samples collected from borings B 1 through 134 ' at concentrations as high as 5,400,000 micrograms per liter (gg/1) and 390,000 µg/1, respectively TPH-mo was detected in the ground water sample collected from boring 132 at a concentration of 12,000 µg/1 BTEX compounds were detected in the same samples at concentrations as high as ' 210,000 µg/1 benzene, 540,000 µg/1 toluene, 630,000 µg/1 ethylbenzene and 3,820,000 µg/1 total xylenes (133) Oil and grease was detected in the samples collected from 131, B2 and 133 at concentrations as high as 1,500,000 µg/1 (B3) BTEX compounds were detected in the ground water '• samples at concentrations as high as 8 5 µg/l benzene, 150 µg/1 toluene, 120 µg/1 ethylbenzene and 1,300 µg/1 total xylenes Seven additional volatile organic compounds were detected in the ground water samples at concentrations ranging from 2,100 µg/1 to 2,000,000 µg/1 Fuel additives were not ' detected at or above laboratory reporting limits in the ground water samples On 04, 05 and 25 September 2003,soil borings MW,1 through MW4 and 135-60 feet were advanced ' at the site Pilot borings MW1 through MW3 and 135 were advanced using a CME-75HT drill ng, equipped with 8 25-Inch diameter hollow-stern augers, the drill rig and three-man crew were supplied by Mitchell Drilling Environmental Pilot boring MW4 was advanced using a limited- access drill rig(LAR)equipped with 8 25-inch diameter hollow stem-augers,the LAR and three-man crew were supplied by Cascade Drilling ' Borings MWI. through MW4 were drilled to a depth of 40 feet below surface grade (bsg) for completion as ground water monitoring wells Boring 135 was drilled deeper in order to define the ' vertical extent of soil and ground water contamination The planned total depth of boring 135 was 70 feet bsg, as requested by the EHD in their approval letter, however a maximum depth of only 60 feet bsg could be achieved due to the presence of heaving sands ' Pilot borings MW 1 through MW4 were completed as ground water monitoring wells using two-inch diameter schedule 40 PVC casing with 0 020-inch slotted screen installed from approximately ' 20 feet to 40 feet bsg in all four borings, with blank casing extended to the surface The filter pack (No 3 Lonestar sand) was installed from approximately 22 feet to 40 feet bsg A nominal 2-foot 'i bentonite chip plug was then installed above the filter pack and hydrated The wells were then ' Advanced GeoEnvironmental,Inc