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Site Conceptual Model October 3,2002 <br /> ARCO FacilityNo 6100 <br /> 4 3 2 Extent of Dissolved Petroleum Hydrocarbon Impact <br /> Analytical results of groundwater samples collected between February 2001, and June 2002, are <br /> included in Appendix D As discussed above, perched groundwater beneath the site occurs in <br /> two sand strata in the sandy unit Histoncally, vadose zone wells VW-1 through VW-6, VW-14, <br /> and MW-2 (screened in Sand 1) have contained rechargeable water Floating product (up to 0 02 <br /> feet thick) or a product sheen have historically have been observed in wells VW-1 and VW-4, <br /> installed near the product dispensers Groundwater has not been detected in other monitoring <br /> wells screened in Sand 1 (wells MW-4, MW-6, and MW-8) Based on current site conditions <br /> and data collected to date, characterization! of the lateral extent of impacted groundwater in <br /> Sand 1 is adequate 5UGt'f "tt <br /> Of the wells screened in Sand 2, only well MW--1 has water Free product has been observed in <br /> well MW-1 since the third quarter 2000, up to 1 47 feet thick Characterization of the lateral <br /> extent of free product and impacted groundwater offsite to the southeast in Sand 2 is incomplete <br /> D k` <br /> 1jāœ“t <br /> P\Bp-Arco for URS161001Reports16100 SCM doc Page 10 Stratus <br />