SITE INFORMATION AND CORRESPONDENCE_CASE 2

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CHRONOLOGY CITY OF ESCALON E-Z GAS MINI-MARKET 1405 MAIN STREET ESCALON CA 95320 10/19/90 A "No Further Action letter was issued for this site on this date,following an investigation of contamination under a diesel tank removed in the late 1980's. (site address at that investigation was 1405 McHenry Ave.) 1996-1998 Three soil borings were drilled on this site in June 1996 as part of an environmental subsurface investigation prior to using this parcel to straighten and widen Hwy 120. Soil samples were collected as deep as 25 feet below surface grade (bsg). The only contaminant found was TPH as lube oil it 2 feet bsg. In February 1997 a hand auger boring to 18.5 feet bsg was completed and low levels of petroleum contamination was detected. MTBE testing using EPA Method 8020 was non detect. In March 1997 three soil borings to 50 feet bsg were drilled near the existing UST's. No contamination was found in any of the soil samples tested. MTBE was tested for using EPA Method 8020 and was non detect. The City of Escalon bought the property in February 1998. Operation of the UST's stopped in January 1998 according to the City of Escalon staff. The City of Escalon submitted a UST closure permit application in March 1998 to EHD. The portion of the site where the UST's were located is now beneath Hwy 120 (GIS photos attached). 07/23/98 Three underground storage tanks were removed this date under permit and inspection by the Environmental Health Department (EHD). Tank#2-6,000 gal. diesel, tank#3-5,000 gal. gasoline and tank#4-500 gal. waste oil. Odor and discoloration was noted under tank#2 by EHD staff. No odor or discoloration was noted under tank#3 or tank#4 by EHD staff. 07/24/98 One underground storage tank was removed this date under EHD permit and inspection, tank#1-10,000 gal. gasoline. Odor noted by EHD staff. 08/04/98 Analytical results of the soil samples collected from beneath the UST's at the time of removal reported diesel contamination of 9,100 ppm at 12 feet bsg under tank#2, and MtBE contamination of 4.4 ppm using EPA Method - 8260 at 11 feet bsg under tank#1. Analytical results were ND for all samples collected under tank#3 and tank#4. 08/14/98 Date of Unauthorized Release Report#98-U35 and Prop 65#98-127. 08/21/98 Re-sampling of tank pit areas occurred this date. A sample collected from tank pit#1 at 14 feet bsg reported .33 ppm MtBE using EPA Method 8020. Because of problems with the backhoe, a depth of only 12 feet bsg could be reached in the diesel pit. Soil analytical results reported 540 ppm TPHd.