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DEC 07 '88,15:37 LEVINE-Fr <br />P.3 <br />LEVINEFRICKE <br />August 2, 1988 <br />LP-1768 <br />PRELIMINARY DESIGN <br />OF A REMEDIAL SYSTEM FOR REMOVAL OF FLOATING PETROLEUM PRODUCT <br />MOLT, CALIFORNIA <br />INTRODUCTION <br />Petroleum compounds have been detected in samples from soil <br />borings and monitoring wells near a Southern Pacific Pipe Line <br />Company (SPPL) pipeline in Holt, California, approximately 7 <br />miles west of Stockton (the "Site"). The Site is bounded by <br />Trapper Slough to the west and north, and agricultural land to <br />the east and south (Figure 1). The Site is intersected by Cook <br />goad, with about 50 percent of the affected area occupied by an Arcady Oil waste drilling-mud storage area. <br />SPPL requested that Levine'Fricke provide a conceptual design for <br />extracting/removing floating product detected in monitoring wells <br />on the Site. The conceptual design developed herein is based on <br />the results of initial investigations by the Mark Group as well <br />as subsequent investigations performed by Levine•Fricke in July <br />1988. Previous investigations by the Mark Group (October 6 and December 9, 1987) provided a preliminary definition of the <br />vertical and areal extent of petroleum migration in soil and <br />ground water at the Site. The work performed by Levine'Fricke <br />included: re-surveying monitoring wells, measuring water levels <br />and product thickness, calculating equivalent water elevation for <br />fluid surface, performing slug tests to evaluate hydraulic <br />conductivity of the shallow sediments, and preliminary <br />ground-water modeling to capture petroleum hydrocarbons and <br />affected ground water. <br />FIELD MEASUREMENTS <br />Eignits_irriagmaga l Water-Level Measurements <br />Prior data were reviewed to obtain surveyed elevations for <br />existing wells. Boring log information on the Arcady wells was <br />not available, but old well elevations were identified. A <br />re-survey of the existing wells in the vicinity of the oil spill <br />area (Figure 2) was conducted on July 19, 1988 by Levine•Fricke <br />staff. The survey revealed that well elevation data for the old <br />Arcady wells and the monitoring wells installed for SPPL were <br />internally inconsistent. Consequently, the most recent elevation