COMPLIANCE INFO - Laserfiche WebLink

Home Browse Search

Site Background Information AGE-NC Project No. 08-1598 Page 3 of 4 According to Mr. Trinkle, the wells were removed utilizing a backhoe and a chain. The chain was wrapped around the tops of the well heads, and the backhoe was used to pull the wells out. Mr. Trinkle noted that the well casings looked like "rusted out pipe with perforations at the bottoms." Additionally, according to Mr. Trinkle, the casings came out as one piece. There wasn't any concrete or other debris in the borehole. After the casings were removed, the boreholes collapsed on themselves. The approximate locations of former monitoring wells MW-1, MW-2 and MW-3 are illustrated on Figure 2. In May 2007, AGE performed a Phase I Environmental Site Assessment for the site. Results of the Phase I are summarized in the AGE-prepared, Phase I Environmental Site Assessment, dated 01 May 2007. On 22 May 2008, AGE advanced thirteen soil probe borings (131 through B13) on site to depths of 3 feet bsg, 15 feet bsg and 10 feet bsg. Soil samples were collected at 1 foot and 3 feet bsg in borings B3 through B12; soil samples were collected at 5-foot intervals, beginning at 5 feet bsg, to total depth of boring B1. Soil samples were collected from boring B2 at 1 foot bsg, 3 feet bsg 10 feet bsg and 15 feet bsg. Soil samples were collected from boring B13 at 1 foot, 3 feet and 10 feet bsg. Additionally, grab ground water samples were collected from borings B1, B2 and B13 at total depth. Chlorinated herbicides were reported in five of twenty six soil samples analyzed at a maximum concentration of 0.048 milligrams per kilogram (mg/kg). Analytical results of soil and ground water samples are summarized in Tables Al and A2. Field procedures and sample results are summarized in the AGE-prepared, Limited Subsurface Investigation Report, dated 07 August 2008. On 14 May 2009, AGE advanced three pilot soil borings on site for installation of three ground water monitoring wells (MW-4, MW-5 and MW-6). Soil samples were collected at 5-foot intervals, beginning at 5 feet bsg, to total depth of the boring. Diuron, a urea pesticide, was reported in samples MW4-5 and MW64 at a concentration of 0.02 mg/kg. Additionally, methomyl, a carbamate pesticide, was reported in samples MW4-5 and MW64 at a concentration of 0.001 mg/kg. Analytical results of the soil samples are summarized in Table Al. Field procedures and sample results are summarized in the AGE- prepared, Monitoring Well Installation Report, dated 04 August 2009. GROUND WATER MONITORING EVENTS Ground water monitoring was performed at the site on four occasions: 08 June 2009, 10 August 2009, 16 November 2009, and 09 February 2010. During this time, depths to ground water from wells MW-4, MW-5 and MW-6 were measured between 8.92 feet and 9.89 feet below the top of well casings. Ground water elevations at the site generally Advanced Get)Environmental,Inc.