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5 July 1995' <br /> AGE-NC-95-0124 <br /> Page 5 of 6 <br />' 3 8 WELL SURVEY <br /> In accordance with the Addendum to Appendix A Guidelines for Central Valley Regional Board <br /> Requests for Site Closure, a well survey for the site was performed The well survey is performed to <br /> determine the locations of all production wells for municipal,'domestic, agriculture, industry within <br /> 2,000 feet of the site <br /> According the City of Lodi Municipal Utilities, three wells are located within 2,000 feet of the site <br /> City of Lodi Municipal Well#4 is located near the water tower approximately 2,000 feet north of the <br /> site,City of Lodi Municipal Well#3 is located at the 200 block of East School Street, approximately <br /> 1,000 feet west of the site, City of Lodi Municipal Well Al is located approximately 1,500 feet <br /> southeast of the site at the 200 block of East Lodi Avenue (in the alley immediately south of Lodi <br /> Avenue However, Wells #3 and #4 are inactive at the present time and Well #1 is officially <br /> abandoned <br /> 4.0. CONCLUSIONS & RECOMMENDATIONS <br /> A`soil sample collected from the floor of the excavation at a depth of 28 feet indicates that all <br /> ' hydrocarbon impacted soil was removed from directly beneath the former UST However, low <br /> concentrations of petroleum hydrocarbons were detected in a soil sample collected from the west <br /> sndewall (WW-1) <br />' Further excavation to the west to remove the remaining impacted soil was not possible without <br /> demolition or structural damage to the existing structure Therefore, a soil boring (B4) was drilled <br /> 20 feet immediately west of the former UST, inside the building No hydrocarbons were detected in <br /> soil samples from B4 <br /> Figure 3 is a cross-section of the area from bonng B4 to the east wall of the excavation Estimating <br /> the volume of impacted soil from Figure 3, approximately 88 cubic yards of impacted soil are present <br /> beneath the building at the site <br /> Using the TPH-g concentration detected in WW-1 (77 ppm) as the hypothetical average of the <br /> remaining impacted soil, approximately 2 6 gallons of hydrocarbons (gasoline) remain in the impacted <br /> I soil at the site (calculations are included in Appendix D) In-situ remediation of small volumes of soil <br /> containing low concentrations of hydrocarbons is neither technically feasible or cost effective <br /> Ground water at the site is estimated to be approximately 30 feet below the floor of the excavation <br /> Although historically ground water depth was reported to be 35 feet, it is very unlikely that <br /> groundwater will return to pre-drought (1985) conditions Vertical migration of the remairung <br /> 4' <br />