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Technical Excellence Trea& II&MIQ Practical Experience A LANGAN COMPANY Client Responsiveness 6 June 2013 Project No: 731589001 Lisa Medina San Joaquin County Environmental Health Department 1868 East Hazelton Avenue Stockton, CA 95205 Subject: Request for Low-Threat Case Closure RWQCB case #391149 and #391162 420 and 423 N Madison Street Stockton, California Dear Ms. Medina: On behalf of Stockton Arena Hotel &Conference Center, LLC,Treadwell & Rollo,A Langan Company (T&R) has prepared this Request for Low-Threat Case Closure for Regional Water Quality Control Board (RWQCB) cases #391149 at 420 N Madison Street and #391162 at 423 N Madison Street, Stockton, California (Sites) (Figure 1). The San Joaquin County Environmental Health Department(EHD) is the local regulatory agency overseeing both open cases.This request addresses case closure criteria in the California State Water Resources Control Board Low-Threat Underground Storage Tank Case Closure Policy(LTCP) and Section 6.6 of the RWQCB's 2004 Appendix A to the Tri-Regiona/Board Staff Recommendations for Pre/iminaryInvestigation and Evaluation of Underground Storage Tank Sites. These criteria for closure were requested in an EHD letter to Stockton Arena Hotel &Conference Center, LLC dated 10 April 2012, and was further discussed with EHD on 21 March 2013. The following is a description of the Sites, summary of previous investigation and remediation, conceptual site model, and discussion of existing data and rationale in support of case closure. SITE DESCRIPTION AND PREVIOUS INVESTIGATIONS 420 N Madison Street 420 N Madison Street is located at the southeast corner of N Madison and West Fremont Streets and is referred to as the former Carando Machine Works (Carando). Carando was occupied by several buildings until March 2004. Buildings in the southern half of the Carando site were constructed between 1920 and 1950. Aerial photographs and Sanborn maps show a gas station pump and service station in the northwest area of Carando from at least 1950 until the late 1960s. The approximate locations of the former service station, underground storage tanks(USTs), and pump islands are shown on Figure 2. From the late 1960s, Carando was occupied by buildings operated by Carando Machine Works. Three USTs, reportedly used to store gasoline and diesel, were present in the sidewalk adjacent to the Carando property until their removal in April 2004. Primary and secondary sources of soil and groundwater contamination at the Carando site have been remediated during multiple excavations in 2004 and 2005, which are discussed in detail in previous reports(T&R, 2004a, 2004b, 2005a). The buildings on the Site were demolished in March 2004 in preparation for redevelopment and construction of the Stockton Hotel, which currently occupies the Site. 555 Montgomery Street. Suite 1300 San Francisco, CA 94111 T: 415.955.5200 F: 415.955.5201 www.langan.com r.ihma ^3rr1 r "J'",Y5Igk • V-winsd • Penmsylvann • Cinnert,c,-t • FJr,,0.i • Abu®hat5i • AV,., • Crri, . nut)11 • I,tanh],_