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San Joaquin County Environmental Health Department (EHD) has reviewed Well Destruction and Excavation Report dated 23 March 2004 as submitted by Advanced GeoEnvironmental (AGE) on 25 March 2004 and the AGE -prepared letter Subject. Soil and Ground Wafer Investigation and Remediation dated 01 April 2004. In addition, EHD and AGE representatives discussed aspects of the investigation and interpretations by telephone on 01 April 2004. EHD comments as follows: The site had reportedly been utilized as a gasoline station from approximately 1940 to 1970. AGE conducted a preliminary site assessment investigation in the area of the former underground storage tanks (USTs) in May 2000. Petroleum hydrocarbon contaminants were detected in soil samples from four of the five borings advanced on the site and in all of the grab ground water samples collected. In October 2000, an initial phase of excavation was conducted to remove impacted soil. Soil samples collected from the excavation floor and sidewalls indicated impacted soil remained in the north and south excavation walls, but had been removed from the excavation floor area sampled, and from the east and west excavation walls. Five ground water monitoring wells were installed in November 2000. Impacted soil was encountered in the borings advanced for MW -2 and MW -3 at 10 and 15 feet below surface grade (bsg). Petroleum hydrocarbon contaminants were initially detected in all five monitoring wells, but only MW -2 and MW -3 have been consistently impacted. *"..BILE COPY ENVIRONMENTAL HEALTH DEPARTMENT ,o.._.�o SAN JOAQUIN COUNTY 2 .a N' :X Donna K. Heron, R.E.H.S. Director Unit Supervisors P 304 East Weber Avenue, Third Floor Carl Borgman, R.E.H.S. Al Olsen, R.E.H.S. Stockton, California 95202-2708 Mike Huggins, R.E.H.S., R.D.I. cQt+Fo �`v Program Manager Douglas W. Wilson, R,E.H S. Telephone: (209) 468-3420 Margaret I agorio, R.E.H.S. Laurie A. Cotulla, R.E.H.S. Fax: (209) 464-0138 Robert McClellon, R.E.H.S. Program Manager Mark $arcellos, R.E.H.S. JOSEPH & ROSANNA PANETTA PO sox 1072 APR 1 9 2004 SAN RAMON CA 94583 RE: Former Tracy Diner Site Code: RO#727 95 W. 11th Street APN: 233-130-24 Tracy, CA. 95376 San Joaquin County Environmental Health Department (EHD) has reviewed Well Destruction and Excavation Report dated 23 March 2004 as submitted by Advanced GeoEnvironmental (AGE) on 25 March 2004 and the AGE -prepared letter Subject. Soil and Ground Wafer Investigation and Remediation dated 01 April 2004. In addition, EHD and AGE representatives discussed aspects of the investigation and interpretations by telephone on 01 April 2004. EHD comments as follows: The site had reportedly been utilized as a gasoline station from approximately 1940 to 1970. AGE conducted a preliminary site assessment investigation in the area of the former underground storage tanks (USTs) in May 2000. Petroleum hydrocarbon contaminants were detected in soil samples from four of the five borings advanced on the site and in all of the grab ground water samples collected. In October 2000, an initial phase of excavation was conducted to remove impacted soil. Soil samples collected from the excavation floor and sidewalls indicated impacted soil remained in the north and south excavation walls, but had been removed from the excavation floor area sampled, and from the east and west excavation walls. Five ground water monitoring wells were installed in November 2000. Impacted soil was encountered in the borings advanced for MW -2 and MW -3 at 10 and 15 feet below surface grade (bsg). Petroleum hydrocarbon contaminants were initially detected in all five monitoring wells, but only MW -2 and MW -3 have been consistently impacted.