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�, y: GeoiogiealTeclucicsl�c. Page 3 . City of Escalon(Escalon) fProject No.: 1114.2 _ September 29,2003 On October 19, 1990, Jogi Khanna, M.D., M.P.H.; San Joaquin County Public Health r Services (SJCPHS), sent a letter to the property owner confirming the completion of site I.r investigation and remedial action at the site. The SJCPHS position was that no further action is required at this time. A tank test was performed on August 11, 1994 at which time Eleanor Ratliff of SJCPHS _ denoted an unauthorized release of gasoline at the EZ Gas Mini-Mart site. Ms. Ratliff recommended further investigation to determine the nature and extent of the contamination. On June 20, 1996, Kleinfelder, Inc., advanced three soil borings (B-13, B-14 and B-15) at the EZ Gas Mini-Mart site to a depth of 25 feet bgs. Details of the work performed are discussed in the Limited Subsurface Investigation Highway 120 / McHenry Avenue Improvement Project Report, Kleinfelder File No. 20-3941-01.E01, dated August 20, 1996. On February 13, 1997, a Kleinfelder field geologist advanced a single boring at an angle to a depth of 18.5 feet beneath the "center tank" on the site by means of.hand auger. On March 18 and 19, 1997, Kleinfelder advanced three soil borings to a depth of 51.5 feet bgs. Details of the work performed during this investigation are discussed in the Limited Soil Assessment Arco Gas Mini Mart / EZ Gas Mini Mart 1305 Escalon Avenue / 1405 Main Street APN 225-100-03 / APN 227-062-04 Report, Kleinfelder File No. 20-3941-0I.E01 dated April 2, 1997. On July 23 and 24, 1998, Wright Environmental Services, Inc. (Wright) collected samples from the tank pits and stockpiled soils from the tank removal work performed at the site. Additional samples were collected by Wright on August 21 and 26, 1998. On November 23, 1998, Wright collected soil samples (P-1 through P-6). from various points along the piping system associated with the distribution of petroleum hydrocarbons at the former EZ Gas Mini-Mart. On December 9, 1998, Wright collected additional soil samples from borings (RS-1, RS-2 r and RS-3) and stockpiled soil at the site. 2.0 SITE CLOSURE CHECKLIST LThe following information provides a summary of the corrective action work that have been performed at the site to date and provides answers to the Appendix B Checklist for Closure. Estimates are made regarding the fate and transport and the total mass of contaminants present in the soil and groundwater. L