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September 25, 1998 <br /> Page 4 <br /> • CONCLUSION <br /> Low residual hydrocarbons are concentrated in the groundwater on the north end of the <br /> site, north of the product islands Soil results indicate no hydrocarbon .impact to soil <br /> Therefore, based on the results of this investigation, we recommend quarterly monitoring <br /> of groundwater for one complete hydrologic cycle to better determine groundwater flow <br /> direction and gradient and to better determine hydrocarbon impact to groundwater <br /> If there are any questions regarding the contents of this report, please call us at <br /> (916) 858-2350 <br /> Sincerely, <br /> Pacific Environmental Group, Inc. <br /> AL-LI <br /> Michael E Mitchener ���ED . '.0 <br /> Project Geologist �`' ���E 6 Qe <br /> % L) 4556 z <br /> Christine W Brown <br /> i <br /> Senior Geologist s��T <br /> RG 4556 F OF <br /> L <br /> Attachments Table 1 - Water Wells Located Within 0 5 Mile Radius <br /> Table 2 - Soil Analytical Data <br /> Table 3 - Groundwater Analytical Data <br /> Table 4 - Soil Physical Properties Data <br /> Table 5 - Soil Analytical Data— Stockpiled Soil Samples <br /> Figure 1 - Site Location Map <br /> Figure 2 - Groundwater Elevation Contour Map <br /> Figure 3 - TPH-gBenzene/MtBE Soil Concentration Map <br /> Figure 4 - TPH-gBenzene/MtBE Groundwater Concentration Map <br /> Attachment A - Field And Laboratory Procedures, <br /> Attachment B - Boring Logs <br /> Attachment C - Surveyors Data <br /> Attachment D - Certified Analytical Reports and Chain-of Custody <br /> Documentation <br /> Attachment E - Physical Soil Test Results <br /> cc Mr Michael J Infurna Jr , San Joaquin Codnty <br /> Mr Mark List, California Regional Water Quality Control Board, Central Valley <br /> Region <br /> 911-007 !B/SOLGWRPT <br />