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I QUARTERLY REPORT April 1994 ' MarIowe Properties 4648 East Waterloo Road IStockton, California ' 1.4 INTRODUCTION At the direction of Mr Jonathan Marlowe of Marlowe Properties, Geological Audit Services, Inc (GeoAudrt) has prepared this quarterly report of groundwater sampling activities and remediation well installation at 4648 East Waterloo Road, Stockton, California I (the site) This report describes the sampling and drilling procedures and presents the results of laboratory analyses ' 2.0 BACKGROUND 2.1 Site Location ' The site is located 1n a flat industrial area east of Stockton, California (Figure 1) A large warehouse, a small office building, two fenced storage yards and a parking/delivery area are present on the site (Figure 2) The office is currently vacant. the warehouse is occupied by C V Sports 2.2 Previous Work IGeoAudrt was retained by Marlowe Properties to install one groundwater monitoring well (MW-2) in December, 1992, for the purpose of sampling groundwater in the vicinity of a ' previously removed underground tank facility No petroleum hydrocarbons were detected in soil samples collected during the construction of MW-2, however, benzene and halogenated hydrocarbons were detected in the water sample from MW-2 in Januaay 1993 I Monitoring well MW-2 was sampled again in April of 1993 and slight increases in these constituents were reported In order to determine the extent of petroleum hydrocarbons, further groundwater assessment, in the form of at least two additional monitoring wells, was required by PHS/EHD In August, 1993, GeoAudrt submitted a work plan to install two groundwater monitoring wells The monitoring wells (MW-3 and MW-4) were installed at the site on September 29 and 30, 1993 MW-3 was drilled to a depth of 100 feet, MW-4 was drilled to a depth of 105 O.ob�n1 A-dd S.�vr a I.. 1 MaIk—PWP.n QIV4.9V 1.35