2007-11-20_REVISION - M1982015 (14)

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' ADDENDUM TO ' INTEGRATED CORRECTIVE ACTION PLAN Colorado Spill Incident No. 2006-1029 Bayshore Pipeline Release Firestone, Colorado ' June 20, 2007 ' 1.0 Incorporation of CDPHE Comments in Emails As stated in Item No 1. in the letter dated March 20, 2007, CDPHE requested that ' comments contained in emails dated January 23, February 6,12,16, and 27, 2007 be incorporated in modifications to the Integrated Corrective Action Plan (ICAP). The emails and pertaining discussion are included in the following sections. A copy of each ' of the emails is included in Appendix 1. 2.0 Emergency Response Activities (Rocky Mountain Pipeline, March 2, 2006) ' As stated in the letter from CDPHE dated March 20, 2007 as Item No. 2, information regarding the emergency response activities conducted by Rocky Mountain Pipeline (RMP) is provided. E-21 obtained the report from RMP documenting the emergency response activities performed during and after the pipeline release. In summary, 46,200 gallons of gasoline were estimated by RMP to have been released. RMP excavated and disposed of 468 cubic yards of petroleum-impacted soils. A small ' portion of the impacted soil was transported to Allied/BFI Tower Road Landfill in Commerce City. Most of the impacted soil was transported to Waste Management Buffalo Ridge Landfill near Keenesburg, Colorado. Approximately 1,200 gallons of petroleum-impacted groundwater was pumped from the excavation made to repair the pipeline. The water was treated on site in frac tanks for future disposal at Arvada Treatment Center. The work was completed between October 30, 2006 and December ' 7, 2006. The RMP report and waste disposal manifests are included in Appendix 2. 3.0 Water Well Search Results ' The CDPHE also requested completion of the search of registered and unregistered wells in Item No. 3 of the March 20, 2007 letter. E-21 performed a water well search by obtaining records from the State Engineer's Office. According to the state records, there ' are 4 wells reported to be within a '/2-mile radius of the release site. They are all located in the northeast quarter of the northeast quarter of Section 2, Township 2 North, Range 68 West of the 6th Principal Meridian. Well information is listed on Table 1. The ' approximate well locations are shown on Figure 2. The wells are reportedly used for domestic and irrigation supply and appear to be installed in the alluvial aquifer with depths ranging from 22 to 30 feet with reported water ' levels of 6 feet. The wells are at least '/-mile from the release site and are located to the south of the St. Wain River. The St. Wain will act as a hydrologic divide. Based on