SITE INFORMATION AND CORRESPONDENCE_2004-2019

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Staff Report: ACL Order for -5- Mr. Frank Guinta, Ms. Shari Guinta Mr. James Ramsey and Mrs. Marilyn Ramsey Frank's One Stop San Joaquin County In January 2002, 11 wellhead treatment systems were installed to protect public health at residences with impacted wells. Domestic wellhead treatment consists of two or three granulated activated carbon (GAC) units connected inline between the well and the domestic user. Due to declining MtBE concentrations at 17950 Airport Way, the wellhead treatment system's air stripper is no longer used before the GAC units to reduce MtBE treatment cost. The domestic well supplying the property at 17933 Airport Way was properly abandoned in April 2001. This residence is now served by a treated domestic water supply well located at the rear of the property at 17933 Airport Way. Former property owner Ray Fulton of Reno, Nevada refused to allow access for the installation of a treatment system on the domestic well serving the tenants of 17971, 17983, and 17995 Airport Way. Data from quarterly monitoring conducted in May 2006 of the untreated domestic well water show that MtBE was detected at a concentration of 3.6 pg/L, down from 7.3 pg/L reported in April 2005. In February 2002, the groundwater extraction system was turned off, in conjunction with the startup of the SVE/AS system, per the approved Remedial Action Plan. By August 2002, TPHg and MtBE concentrations began to increase in both groundwater and the influent air of the SVE/AS system. MtBE concentrations also began to increase in the domestic well located at 17950 Airport Way, immediately north across Yosemite Avenue and hydraulically downgradient of the Site (closest domestic well). Subsequently, SJCEHD's California licensed professional geologist created geologic cross sections from the Cone Penetrometer Testing logs and noted that the second sand unit of the water bearing zone between 30 and 60 feet depth is not currently monitored by monitoring wells, which may represent a migration pathway to the MtBE-impacted domestic wells. SJCEHD noted that an investigation of the second sand unit was warranted. Events Preceding The Cleanup And Abatement Order Work progressed slowly until 1 January 2003, at which time the Dischargers' consultant turned off the SVE/AS system and declared, in a letter dated 15 January 2003, to SJCEHD and Regional Board staff that inadequate State Cleanup Funds remain in the account to operate the remediation system, conduct groundwater monitoring, and maintain domestic wellhead treatment systems. In a letter dated 25 February 2003, SJCEHD directed the Dischargers to restart both the soil and groundwater treatment systems within 10 days. Regional Board staff concurred with SJCEHD that the treatment systems were necessary to properly and effectively remove waste constituents, and the pump/treat system was required to reduce MtBE concentrations and off- site transport toward downgradient domestic supply wells. In March 2003, the Regional Board obtained lead agency status from SJCEHD. On 3 April 2003, Regional Board staff mailed the first draft Cleanup and Abatement Order to Frank Guinta and Guinta Enterprises.