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' Atlantic Richfield Company 6 <br /> ARCO 595,6100 North Highway 99 Stockton CA December 12 2001 <br /> 1 <br /> oxygenates MtBE and 1,2-DCA in groundwater was not achieved during this assessment <br />' TPHg and benzene plumes beneath the site are delineated downgradient laterally, and <br /> onsite vertically <br />' SECOR recommends that the owners of domestic wells 6 and 7, and unknown well 8 (if <br /> accessible) be contacted regarding the proximity of these wells to hydrocarbons, and that <br /> these wells be added to the quarterly sampling event if permission is granted from well <br />' owners SECOR recommends that deep, discretely screened monitoring wells be <br /> installed in the areas adjacent to PSB-1 and PSB-2 to verify sampling results and achieve <br /> vertical delineation of MtBE and 1,2-DCA in groundwater <br />' If you have any questions or comments regarding this report, please feel free to call us at <br /> (916) 861-0400 <br /> Sincerely, <br />' SECOR International Incorporated <br />' 145' O�p,4FESSlplq E BEN,- !�` <br /> Rusty Benkosky, ���24 t dt os' yy <br /> Senior Enginee cc NO C 058399 <br />' a as <br /> Exp J2-Jt, dcw <br /> # <br />' v SOF CA1.*�F� <br /> Greg are 1 ay G 6 6 <br /> Senior Geol ist <br />' Attachments Table 1 - Groundwater Elevation and Analytical Data <br /> Table 2 - Fuel Oxygenates Analytical Data <br /> Table 3 - Well Completion Details <br />' Table 4 - Soil Analytical Data - Soil Borings <br /> Table 5 - Depth Discrete Groundwater Samples <br /> Table 6 - Well Survey Data <br />' Table 7 - Soil Analytical Data - Stockpiled Soil <br /> Figure 1 - Site Location Map <br /> Figure 2 - Site Plan <br /> Figure 3 - Generalized Geologic Cross Section A-A' <br />' Figure 4 - Generalized Geologic Cross Section B-B' <br /> Figure 5 - Groundwater Concentration Map <br /> Figure 6 - Groundwater Elevation Contour Map <br />' Figure 7 - t/2-Mile Radius Well Survey <br /> Attachment A - SJCEHD Letter Dated December 20, 2000 <br /> Attachment B - Historical Maps and Soil Analytical Data <br />' Attachment C - Boring Logs and Key <br /> Attachment D - Field and Laboratory Procedures <br /> . Attachment E - Certified Laboratory Analytical Reports and Chain-of- <br /> Custody Documentation <br />' Attachment F - Groundwater Sampling Field Sheets <br /> 077 43029 3301well mstall2 doc <br />