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October 4,2002 NOA ENVIRONMENTAL PROJECT NUMBER: LE00-429 1 3 Stockton Fire De artment ' Inquiries into the former USTs were made with the Stockton Fire Department as well The records found are discussed in Section IV, above, and included in Appendix B ' 4 Public Water Supply and Sewage Dis osal S stem The California Water Service Company was contacted by telephone to determine the water source for the subject property At the time of the Phase I investigation, the subject parcel was connected to the Cal Water municipal water system The City of Stockton Municipal Utilities Department (SMUD) reported during a telephone conversation that DON Investments has been paying for sewer services According to Larry Williams of SMUD Permit Services,there are no outstanding discharge issues related to the subject property V. SITE CHARACTERISTICS A visual reconnaissance of the subject property was conducted by NOA Environmental prior to the compilation of the Phase I Environmental Site Assessment The property was found to be relatively flat, with no noticeable waterbodies or vegetation The rock-surfaced yard was unevenly graded to a stormwater drain at the northwest corner of the property No odors, staining, discharges, hazardous materials,or other environmental concerns were observed in the immediate vicinity of the former UST Notes from this site visit can be found in Appendix D Dunng the process of drilling the three exploratory soil bonngs, described below, no evidence of preferential pathways such as sand lenses or root holes was observed The borings, however, were advanced in soil that may have been native or may have been fill at the site of the removed tanks, consequently, lack of visual evidence of preferential pathways may not indicate the absence of such ' pathways In the 1987 San Joaquin County Local Health District Inspection Report (Appendix C), Mr Knoll did not mention the presence or absence of preferential pathways under the former USTs, though he did describe the soil as"clay type soil, some sand " Maps showing sewers, septic systems, ' and utility lines at the site were not made available to NOA Environmental VI. SAMPLING AND ANALYSIS f March 26 2001 NOA Environmental proposed to undertake the collection of the remaining Aso P P soil samples required to resubmit the site closure evaluation This workplan can be found in ' Appendix E Pursuant to section III 1 b of the Tri Regional Board Staff Recommendations for Preliminary Evaluation and Investigation of Underground Tank Systems,in the absence of a verified downgradient direction,NOA Environmental advanced three exploratory soil borings at the site of ' the former UST The drilling was performed on May 24, 2001, and the borings were advanced 9