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ARCADIS GERAGHTY&MILLER 9. INTRODUCTION In March, 1998, ARCADIS Geraghty & Miller, Inc (ARCADIS Geraghty & Miller) ' was contracted by Union Oil Company of California(UNOCAL,)to provide a technical review of relevant data collected in connection with environmental investigations performed at the site ' of the former UNOCAL gasoline service station number 0187, located at 437 East Miner Avenue, Stockton, California (the "Site"), and to attend a meeting with San Joaquin County ' Pubhc Health Service(SJCPHS) The meeting, held on April 28, 1998 at the SJCPHS office in Stockton, was called to determine whether consensus could be achieved between UNOCAL and SJCPHS as to whether enough site data and information had been collected to provide the basis for closure of the Site In addition to representatives of SJCPHS, UNOCAL, and ARCADIS Geraghty & Miller, a representative of the California Regional Water Quality Control Board, Central Valley (RWQCB-CV) was also present At the meeting, SJCPHS indicated that it was their position that the vertical and lateral extent of soil and groundwater impacts at the Site had not been delineated and UNOCAL should conduct an environmental ' investigation to accomplish the impact delineation SJCPHS indicated that the delineation of the impacts would require characterization of soil impacts above and below groundwater out ' to the area where the petroleum hydrocarbon impacts were nondetect ' On behalf of UNOCAL, ARCADIS Geraghty&Miller conducted a limited subsurface investigation at the Site based on a work plan submitted to the SJCPHS dated May 26, 1998 ' The May 26, 1998 work plan was prepared in response to a request by the SJCPHS, as described above, to vertically delineate the dissolved-phase petroleum hydrocarbon plume at the Site ' After review of the May 26, 1998 workplan, the SJCPHS responded in writing p p g commenting on and requesting modifications to the work plan which included SJCPHS did ' i