Laserfiche WebLink
SITE HISTORY <br /> Shell formerly operated one 8-inch diameter and one 10-inch diameter, crude oil <br /> pipelines, which carried crude oil from the Central Valley to the Bay Area. The <br /> pipelines trended generally northwest to southeast across the site. The former pipelines <br /> ran through farmed properties and were reportedly removed from operation during the <br /> 1960s and the pipelines were removed in 2005. The site lies within Neighborhoods B, C <br /> and D of the proposed Mountain House Development. <br /> NEIGHBORHOOD B <br /> 2005 Site Investigation: As described in the November 18, 2005 report, Clayton Group <br /> Services (Clayton) conducted a soil and groundwater investigation along the former <br /> pipeline alignment. A total of 188 soil borings were drilled, and 12 areas of soil and/or <br /> groundwater impact were identified. <br /> 2006 Site Investigation: During April 2006, Science Applications International <br /> Corporation (SAIC) drilled 21 shallow soil borings along the former pipeline for <br /> additional soil and groundwater delineation and to collect pre-profiling and leachability <br /> testing samples. It does not appear a summary report of these activities was submitted. <br /> 2007 Remedial Action: As summarized in the June 17, 2008 Remedial Action Report, Shell <br /> Central Valley Crude Oil Pipelines, Neighborhood B Parcel 209-06-08 prepared by Science <br /> Applications International Corporation (SAIC), 12 areas along the former pipeline were <br /> excavated during 2007, and soil vapor samples were subsequently collected from 6 of <br /> the 12 areas. Soil was excavated to depths ranging from approximately 8 to 30 feet <br /> below grade. A total of 34,844 cubic yards of soil were excavated,and 14,291 tons of soil <br /> were transported offsite for disposal. Based on confirmation soil sampling, all 12 areas <br /> have been adequately remediated to the Central Valley Regional Water Quality Control <br /> Board (RWQCB) established tentative remedial excavation goals of 5,000 milligrams per <br /> kilogram (mg/kg) total petroleum hydrocarbons as crude oil (TPHc) and total <br /> petroleum hydrocarbons as diesel (TPHd), or to practical and safe excavation depths, <br /> and the risk of direct contact for future residents and site workers have been removed. <br /> Additionally, the soil vapor sampling results demonstrated that conditions remaining at <br /> the site do not pose a threat to indoor air quality of future buildings proposed at the site. <br /> 080222(11) B-1 CONESTOGA-ROVERS R ASSOCIATES <br />