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AF ir. EXECUTIVE SUMMARY Raney Geotechnical, Inc. has completed Phase I environmental assessment of the subject property. w The approximate 323-acre property is situated in a historically agricultural area of Thornton, San Joaquin County, California. The subject site currently supports two occupied rural farm residences - and a former radio transmission building (see Plate 2). Most of the property consists of farmland _ Y for grape vineyards, except for the far northwesterly portion of the site, which supports a pear orchard. Our historical research indicates that the subject property has been used for agricultural (vineyards and orchards) and rural residential purposes for more than 90 years. We understand that the two on-site rural farm residences were reportedly constructed in the early 1900's. W During our site reconnaissance we observed two "half' 55-gallon drums containing apparent waste oil in the southwesterly residential area. Although no evidence of soil staining was observed near these containers these containers should be removeA appropriately from the property prior to any redevelopment or renovation activities. _ An approximate 500-gallon above-ground diesel fuel tank with secondary containment is located within the southwesterly residential area; our observations of this tank area revealed petroleum hydrocarbon staining to surface soils beneath the tank's fill port just outside the tank's secondary { containment structure. uld t e�.stained_so� d more than,faurc_es beneath u�round surfaces. Limited screening sam lin testin of soils in this tank area is recommended. In our experience, surface soils on properties that have supported many years of orchard farming have the potential to contain elevated concentrations of agricultural chemicals such as lead- arsenate and persistent organochlorinated pesticides in surface soils. Given this, it is recommended that limited screening sampling and laboratory analysis of near surface soils be performed within the northwest portion of the property that has historically supported an orchard. During nur rer.PJt e�nnnaissanre. w,V,.{ , if any of the, zty_t1QeSar� x�]1GllidP t1 :17Se,:�af rhx1 7P��c�.th��_cL,nuld he Several of the current structures associated with the on-site residences were reportedly constructed prior to 1975. Due to the age of the on-site buildings, it is possible that asbestos containing building materials are present. An asbestos survey would be required prior to any significant renovation or demolition activities. = 1 Our research of government agency information indicates that there have been no reported contamination conditions of a sufficient magnitude or proximity considered threatening to the environmental integrity of the subject property.