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4a. <br /> .. c <br /> F - <br /> EXECUTIVE 3UNUKA RY <br /> i <br /> Western Geologic Resources,Inc.(WGR)conducted a subsurface investigation in May and,lune <br /> 1994 at the Apache Plastics,Inc.(API)manufacturing facility located at 2050 East Fremont Street E <br /> in Stockton,California. The purpose of this investigation was to further evaluate the lateral and <br /> horizontal extent of fuel hydrocarbons beneath the API facility and to evaluate if fuel hydrocarbons <br /> were migrating off-site in the estimated downgradient direction, The subsurface investigation i. <br /> included the following. <br /> pq Drill three soil borings,B-5,B-6 and B-7 and complete the borings as monitor wells MW-5, <br /> MW-6 and MW-7,respectively. <br /> • Develop all new monitor wells. <br /> • Collect liquid samples from all new and existing monitor w.11s,which include MW-1,MW-2, <br /> and MW-4 through MW-7. No groundwater sample could be obtained from monitor well <br /> MW-3,as it was dry. <br /> 4 { <br /> A total of twelve soil samples were analyzed from the three soil borings drilled to a maximum depth <br /> of 72 ft. Total purgeable petroleum hydrocarbons (TPPH), as gasoline, and benzene, toluene, <br /> w ethylbenzene and total xylenes(BTEX)were not detected in any of the soil samples analyzed. Total <br /> petroleum hydrocarbons (TPH),as diesel,were detected in the four soil samples analyzed from <br /> ' boring E-7 at a concentration of 20 parts-per-million(ppm). <br /> as On 15 June 1990 liquid hydrocarbons,characterized as gasoline,were detected floating on top of <br /> s <br /> the water column in well MW-1, located adjacent to the former underground fuel storage tank <br /> location. TPPH was detected in the groundwater samples from monitor well MW-5 imide the API <br /> v <br /> building and well MW-7 to the west of the API site on the Port Stockton Food Distributor property <br /> at concentrations of 1,500 parts-par-billion(ppb)and 460 ppb,respectively. TPPH was not dotected <br /> in groundwater samples from MW-2,MW-4 and MW-6 located on the cast side of the API building. <br /> Benzene was detected in the groundwater samples from monitor wells MW-6 and MW-7 at <br /> 066RU A.va <br /> w <br /> �J <br />