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L �"� `�Phase I Environmental Site Assessment East Main Street,Stockton,California December 10,2004 Page S 6. The search of the databases revealed information pertaining to 17 locations. The databases specified by ASTM are commonly subject to infrequent and partial updating. This is especially true of those locations 6. that no longer warrant inclusion in a given database. It is therefore not unusual to fail to fmd supporting documentation for locations identified in the ASTM specified database search on file with local regulatory agencies. 4.2 ADDITIONAL ENVIRONMENTAL RECORD SOURCES 4.2.1 San Joaquin County Environmental Health Department Addresses for the Site properties and selected off-Site properties identified in the government databases were submitted to the San Joaquin County Environmental Health Department (SJCEHD) and the non- I .. confidential portions of their files were researched. SJCEHD had records for three of the ten locations ' submitted. SJCEHD had no files for the Site. An assumed groundwater flow direction to the south was utilized during the course of this assessment. L. This assumption is based upon the southerly groundwater flow direction information found during the recent SJCEHD file review for 150 N. Sinclair Avenue,Marley Cooling Tower Company Facility.The results of the review of documentation on file at SJCEHD are summarized below: • 4627 E. Main Street was the former location of a 550-gallon underground storage tank (UST) owned by Brett Winquest.The UST had contained leaded gasoline and was removed in October 1990 by Thorpe Oil, Inc. Soil samples collected from the tank removal indicated that •� contaminants were not detected at or above laboratory reporting limits. SJCEHD considers this location as a permanently closed site. This location is approximately 200 feet northeast of the Site and does not appear to pose a risk to the project Site due to its closed status with SJCEHD and the r lack of detected contaminants. • 5458 Section Road was the former location of three 8,000-gallon USTs owned by Lagorio Farms/ACE Tomato. Two USTs contained leaded gasoline and one UST stored diesel fuel. The USTs were removed in December 1998. Soil samples collected from the tank removals indicated total petroleum hydrocarbons (TPH) quantified as gasoline at concentrations up to 21,000 milligrams per kilogram (mg/kg); TPH quantified as diesel at 6,700 mg/kg; methyl tertiary-butyl ` ether (MTBE) at 27 mg/kg; tertiary butyl alcohol at 18 mg/kg; and tertiary-amyl methyl ether at 0.24 mg/kg. This location is approximately 3,400 feet southeast of the Site and does not appear to pose a risk to the project Site due the assumed groundwater flow direction and the distance from the Site. • 150 N. Sinclair Avenue is the location of Marley Cooling Tower Company Facility (MCT). This location was the site of a wood treatment plant from 1965 until January 1991. The facility used copper, chromium, and arsenic for wood treatment and discontinued the use of chromium and copper in 1982. This facility has been cited for soil and groundwater contamination since the early 1980s. Groundwater contaminated with chromium and copper extends off the property. According to "Waste Discharge Requirements" from the California Regional Water Quality Control Board (CRWQCB), Central Valley Region that was dated by SJCEHD September 15, 1993, chromium concentrations in the groundwater at this location have been indicated up to 43,000 micrograms per liter (ug/L). A monitoring well designated as MW-446 is currently located immediately southeast of the Site, between the Site and the MCT facility. Historic analytical results for MW-446 show a maximum of 50 ug/L of total dissolved chromium (TDC). Monitoring and cleanup efforts are ongoing at the MCT facility. Other monitor, municipal, domestic, and agricultural/irrigation wells from the area are also sampled to monitor the extent of ` the contamination plume. These sampling events are reported semi-annually to SJCEHD and r. ti l� CONDOR r.