ARCHIVED REPORTS_20100427 ATC 1Q2010 GWMR COMPLETE

Home Browse Search

Ms.Amy Terrell April 27,2010 Page 2 of 10 northward along the eastern side of the road. The site is bordered to the west (up gradient) by South Highway 33 followed by agricultural land to the north and an industrial facility to the south. The industrial facility was occupied until April 2009 by Insulair, Inc, a paper products manufacturer. Prior to Insulair, the facility was operated by the current owner, Hunter Container, a container manufacturer, and US Can Company, a can manufacturer. This facility is commonly referred to US Can. Underground petroleum pipelines owned by Old Valley Pipeline (OVP) and the Tidewater Associated Oil Company (TAOC) were formerly located on the US Can property along the west side of South Highway 33. Kinder Morgan Energy Partners (KM) currently has a pipeline in this area. The OVP and TAOC pipelines were used to carry crude oil from Bakersfield to Richmond from the early 1900s until the 1970s. The KM pipeline reportedly transports gasoline, jet fuel and diesel (SAIC, 2009). The former Vernalis Pump Station, an OVP crude-oil pumping station, is located at the southeast corner of the intersection of Highway 33 and Welty Road. During environmental investigations in 1995 and 1996, petroleum hydrocarbons were discovered in the soil and groundwater in the vicinity of the current and former pipelines and concentrations continue to exceed regulatory limits or screening levels (SAIC, 2009). Environmental activities at this location are currently managed by the Chevron Environmental Management Company. Previous investigations at the Site suggest that nitrogen and pesticide constituents may have leached to the groundwater from the former storm water pond, located near the north corner of the Site. Groundwater monitoring and sampling activities have been ongoing since 1996. MONITORING WELL NETWORK The Site monitoring well network consists of seven groundwater monitoring wells at locations shown on Figure 2. A groundwater sampling schedule is presented in Table 1. Monitor wells MW-1 through MW-3 were installed in November 1996. Monitor wells MW-4 and MW-5 were installed in February 1998. A sixth well, MW-6 was installed in June 2002 as an intergrid monitoring well in the Initial Remediation Pilot Study area. In early 2006, the surface casing was inadvertently damaged and MW-6 was subsequently destroyed in August 2007. Two new monitoring wells, MW-6R and MW-7, were installed in August 2007 to monitor the performance of the Expanded In-Situ Groundwater Remediation Pilot Test (the Expanded Pilot Test). Monitoring well MW-1 is no longer sampled as part of the current Site Monitoring and Reporting Program. Monitor well construction details are summarized in Table 2. SAMPLING PROCEDURES First quarter semi-annual groundwater monitoring and Remediation Pilot Study monitoring was performed on March 4, 2010 (March 2010 groundwater sampling event). ATC performed all fieldwork associated with the sampling event. The depth to groundwater was measured in each well. Groundwater quality parameters were also recorded during purging and groundwater samples were collected for analysis. The field logs and sampling procedures are provided in Attachment 1.