SITE INFORMATION AND CORRESPONDENCE

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MT San Joaquin County DIRECTOR Pqu rN Donna Heran,REHS Environmental Health Department ASSISTANT DIRECTOR 600 East Main Street Laurie Cotulla,REHS W: _ Stockton, California 95202-3029 PROGRAM COORDINATORS -- Mike Huggins,REHS,RDI • _C ' �P • Website: WWW.S OV O! /ehd Margaret Lagorio,REHS F'p R�.l %g 9 Robert McClellon,REHS Phone: (209) 468-3420 ,teff Carruesco,REHS, RDI Fax: (209) 464-0138 Kasey Foley,REHS February 24, 2009 Mila S Padilla Tr. PO BOX 1036 Tracy CA 95378 Subject: 3-B's Truck and Auto Plaza 14749 N Thornton, Lodi, CA APN 055-150-26. The San Joaquin County Environmental Health Department (EHD) received a complaint alleging that storm water at 3-B's Truck and Auto Plaza was flooding the parking lot, the water well site, and the monitoring wells. An inspection conducted on February 18, 2009, by the EHD staff confirmed that the water well casing, the base of the pressure tank, water lines, and several monitoring wells were submersed with storm water that had an oily sheen. Water marks and stains found on the cement retaining walls and well casing indicate the water level has risen above the wellhead in the past. The inspection also found the 3-Bs Truck and Auto Plaza water well is improperly constructed to prevent flood waters held by the secondary containment and bulkhead retaining walls from rising above the wellhead. The EHD is concerned that contaminated storm water may enter into the water well and/or monitoring wells and further impact the site groundwater and that the contaminants may migrate and impact the Flag City Community Service Area (CSA) public drinking water wells. The monitoring well located within 20 feet of the water well has been found to have Methyl-tert-butyl-ether (MtBE) above the drinking water primary maximum contaminant level (MCL ) standard of 13 parts per billion (ppb). The presence of this contaminant in the groundwater from the monitoring well in close proximity to the on-site drinking water well, was the reason that 3-Bs Truck and Auto Plaza were allowed to connect to the Flag City CSA water system for it's drinking water in 2006. The EHD was informed in 2006, that the 3-Bs Truck and Auto Plaza water well would be retained for fire suppression uses. During the February 18, 2009, inspection by the EHD staff it was observed that components required to make the well usable for fire suppression have not been installed. The EHD considers this well inactive with no apparent function. The following sections of the EHD San Joaquin County Well Standards and the State of California Bulletin 74-81 apply to this situation.