Laserfiche WebLink
California Regional Water Quality Control Board - <br /> ��! Ventral Valley Region ,..L <br /> Karl E. Longley, SCD, P.E.,Chair '' <br /> Linda S.Adams Arnold <br /> Seceelaryfw, 1 55 E Str45-e 1,r6-Fax <br /> California 5910 Schwarzenegger <br /> Gnvirunmeridal (559)430-51 16•Fax(559)4A5-5910 {,�i�eruor <br /> Prronme it hup:Wwww.waterbow ds.civ.gavlcentraly al ley <br /> 21 November 2008 <br /> M, Scott Mansholt <br /> Chevron Environmental Management Company <br /> 6111 Ballinger Canyon Road <br /> Rm 3432 <br /> San Ramon, CA 94583 <br /> REVIEW - WELL ABANDONMENT REPORT AND AMENDED SOIL ANO GROUNDWATER <br /> INVESTIGATION WORKPLAN, US CAN - WELTY ROAD PROPERTY, VERNALIS, SAN <br /> JOAQUIN COUNTY <br /> Chevron Environmental Management Company (Chevron) submitted a Well Abandonment <br /> Report (Report) and the Amended Soil and Groundwater Investigation Workplan (Workplan), <br /> dated 12 November 2008. The Report and Workplan was prepared by Science Applications <br /> International Corporation (SAIC) on behalf of Chevron. The historical Old Valley Pipeline <br /> (OVP) and Tidewater Associated Oil Company (TAOC) pipelines, formerly owned/operated by <br /> predecessors of Chevron, were along the northeast side of the US Can (Site) property. Crude <br /> oil leaks attributed to the historical OVP and/or TAOC pipelines have been documented at the <br /> Site. <br /> On 11 October 2007, a monitoring well abandonment and a soil and groundwater investigation <br /> workplan was approved by the Central Valley Regional Water Duatity Control Board (Central <br /> Valley Water Board) staff. During August 2008, SAIC completed a Site investigation to <br /> evaluate the extent of affected soil and groundwater. In addition, SAiC destroyed groundwater <br /> monitoring wells MW-4 and 5. Based on the investigation results, SAIC determined that <br /> additional borings were needed. <br /> In order to complete the project by the end of the year, SAIC requested verbal approval of the <br /> Workplan. According to the Workplan, SAIC proposed ten soil borings for delineation and if <br /> affected soil is noted, an additional nine contingency borings are proposed. On 13 November <br /> 2008, Central Valley Water Board staff forwarded approval of the Workpian to SAIC via e-mail. <br /> Central Valley Water Board staff concurred with the proposed Workplan and this letter <br /> provides written confirmation. <br /> California Environmental Protection Agency <br /> Recycled Puler <br />