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� fl <br /> � N <br /> AthnttL 12]LhhLld Comp on 4 <br /> ARCO 59S 6100 North I homay 99 Stockton CA October 2 2000 <br /> at concentrations of 807ppb and 4 48 ppb, respectively Wells MW-2, <br /> MW-3, and MW-4 had reported concentrations of 1,2-DCA ranging <br /> from 38 8 ppb to 84 4 ppb <br /> • Groundwater flow was to the northwest with a gradient of 0 007 ft/ft <br /> • A total of five water wells were located in the survey area Including an <br /> active domestic well on the ARCO property No municipal wells were <br /> located in the survey area <br /> • Approximately 10 cubic yards of stockpiled soil generated during <br /> drilling activities was disposed of at Vasco Road Landfill in Livermore, <br /> California <br /> CONCLUSIONS AND RECOMMENDATIONS <br /> Based on the data collected dui Ing this assessment, petroleum hydrocarbons have <br /> impacted both soil and groundwater beneath the site To confirm concentrations of <br /> hydrocarbons in groundwater, SECOR recommends the site be placed on a quarterly <br /> sampling schedule <br /> Additionally, the domestic well onsite should be sampled to verify that it has not been <br /> . Impacted by hydrocarbons <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 Inter national ncorporated <br /> R4w— <br /> ��p,ED GF <br /> Rusty Benkosky, P ��5 O(O <br /> Project Manager ¢r`' GREG O� <br /> 6ARCLAy a <br /> �f No 62 <br /> Greg Barclay, R G 6260 PC <br /> Senior Geologist <br /> Attachments Table I - Soli Analytical Data - Soil Borings <br /> Table 2 - Groundwater Elevation and Analytical Data <br /> Table 3 - Well Survey Data <br /> . Table 4 - Soil Analytical Data - Stockpiled Soil <br /> Figure 1 - Site Location Map <br /> Figure 2 - Groundwatei Concentration Map <br /> Figure 3 - Groundwater Elevation Contour Map <br /> 077 41941 z30ANdt untitl doc <br />