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k4 KLEINFELDER 3 FIELD ACTIVITES This Revised Workplan describes a scope of work to address recommendations of the "recognizable environmental conditions" noted in the Phase I Environmental Site Assessment (ESA) in addition to the conditions and requirements previously expressed by the RWQCB. Kleinfelder's ESA noted the need for sampling shallow soil profiles throughout the site for residual fertilizer compounds, shallow soil sampling in historical fertilizer storage areas, shallow soil sampling in areas of (stormwater) runoff, shallow groundwater sampling, domestic water well sampling, and a geophysical investigation of a possible underground storage tank (UST). To accomplish the tasks of completing the additional characterization of soil and water at the site noted above Kleinfelder proposes to collect shallow soil samples by hand auguring to a total depth of 18 inches below the ground surface (bgs) within areas of past fertilizer tank storage and tank washout area, stormwater runoff collection areas, and within the residence leach field. Additionally, the assessment of the shallow groundwater would be accomplished by drilling and installing two monitoring wells near the upgradient and downgradient sides of the property. Soil and grab groundwater samples would be analyzed from the boring. A water sample would also be collected from the domestic well on site for laboratory analysis. The area described as historically having two USTs will be investigated by performing a geophysical survey of the suspect area. This area is documented as having 2 USTs but the Schmiedt's can only recollect the removal of 1 UST. Based upon the survey results the subsequent course of action would be discussed if a tank is present. In the RWQCB's request for a Revised Workplan to investigate the soil and groundwater at the subject property the RWQCB requested that the investigation include the following analyses of soil and groundwater samples be included: • Pesticides • Fumigants (including ethylene dibromide, 1,3-dichloropropene, and dibromochloropropane, • Fertilizer constituents (including ammonium, nitrate, nitrogen, phospate, and sulfate), • Carbamates, • Organophosphates, • Metals, • Total Petroleum Hydrocarbons as diesel, • Total Petroleum Hydrocarbons as gasoline, • Aromatic Hydrocarbons, • Fuel Oxygenates, • Chlorinated Hydrocarbons, • Volatile Organic Compounds, • Semi-Volatile Organic Compounds, and • Total Dissolved Solids 27125.E01 /ST03R657 Page 4 of 15 Copyright 2003,Kleinfelder,Inc. May 23,2003