SITE INFORMATION AND CORRESPONDENCE_2004-2019

Home Browse Search

Staff Report: ACL Order for -4- Mr. Frank Guinta, Ms. Shari Guinta Mr. James Ramsey and Mrs. Marilyn Ramsey Frank's One Stop San Joaquin County In a letter dated 6 September 2001, the SJCEHD approved a remedial action plan consisting of soil vapor extraction/air sparging (SVE/AS), additional recovery wells for the pump and treat system, and domestic wellhead treatment. In January 2002, the SVE/AS system was installed and began operating. Private Well Investigation In December 1999, forty-six (46) water supply wells were identified within a half-mile of the Site. In July, August, and September 2000, groundwater from thirty-eight domestic and two irrigation wells was sampled under written direction of SJCEHD (17 May 2000). Of the forty wells initially sampled, MtBE was detected in ten domestic wells and one irrigation well. This information and Site quarterly groundwater monitoring reports showed that the MtBE plume had moved across West Yosemite Avenue to the north and northwest over 600 feet from the Site. Available information indicates that most of the drinking water wells are screened through the shallow to intermediate water bearing zone (40 to 60 feet below ground surface). On 3 August 2000, Regional Board staff were notified by SJCEHD that water supply wells were impacted by MtBE. Subsequently, in a letter dated 14 August 2000 and after discussion with the SJCEHD, Regional Board staff required an interim groundwater extraction system be installed within 30 days to address the MtBE, notification of MtBE impacts to groundwater and provision of an alternative water supply be given to all domestic well owners, and continuation of the remedial investigation. The Dischargers started interim ground water extraction, notified impacted owners, and provided bottled water to residents within the required time. On 16 August 2000, SJCEHD staff met with City of Manteca Public Works (City of Manteca) to discuss installation of a public water supply and sanitary sewer line for the City of Manteca and unincorporated area residents impacted by the MtBE plume. The installation of a sanitary sewer line is required by San Joaquin County for new public water supplies, due to the close proximity of the active private septic systems. The City of Manteca estimated a cost of approximately $2,000,000 to construct a public water supply system and a sanitary sewer service to residents. Time to annex and connect public water supply system and sanitary sewer service was estimated to take up to two years. As a result of this meeting, SJCEHD decided to supply bulk water in tanks in the short term, until completion of construction of the wellhead treatment systems provided a long-term solution. To date, the City of Manteca has annexed the neighborhood but has not provided connections to public water supply system and sanitary sewer service. The City of Manteca has stated publicly that they do not have plans to upgrade services within the next ten years, and if so, would require the landowners to pay for the water and sewer connections. In September 2000, 12 domestic wells impacted by MtBE were disconnected from the residences. Bulk water supply tanks were installed at each home as a temporary water supply. The MtBE groundwater plume, extending over 600 feet from the service station, was reported in the media as the largest plume in San Joaquin County.