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El <br /> • A S S Q C I A T E S I N C <br /> 7.0 NO FURTHER ACTION REQUIRED (NFAR) REPORTNG CRITERIA <br /> ' 71 NFAR Reporting Criteria Evaluation <br /> Using the criteria listed CRWQCB's No Further Action Required (NFAR) Reporting, as outlined <br /> ' by CRWQCB (Section 6 0 of Appendix A of the Tri-Regional Recommendations), conditions at <br /> the subject site were evaluated to determine if NFAR for "Cases Exceeding Water Quality <br /> Objectives" is appropriate for this site <br />? ' Criterion 1: The source of the UST release has been identified and removed -61(4w•� �r�� <br /> ' In August 1993, one 550-gallon waste oil UST, two 4,000-gallon gasoline USTs and two <br /> 8,000-gallon gasoline USTs were removed from the north central portion of the site <br /> During removal, three additional 1,000-gallon USTs were discovered near the western <br /> ' portion of the site and removed These tanks were previously filled with sand and <br /> apparently abandoned in place Soil samples collected at the time of the tank removals <br /> indicated the presence of petroleum hydrocarbon impacted soil at the site There are no <br /> known remaining USTs or ASTs at the site <br /> Criterion 2: Free-phase product in groundwater has been removed to the full extent <br /> ' practicable, in accordance with the UST Regulations (Tale 23, CCR, Section <br /> 2655) VeI <br /> ' In August 1993, Walsh and Associates measured approximately 3 34 feet of free <br /> product in well MW1 On August 16, August 19, and September 2, 1993, Walsh and <br /> ' Associates bailed free product from well MW 1 On September 2, 1993, the measured <br /> free product in well MW1 was 0 1 foot thickness prior to bailing Walsh and <br /> Associates concluded that the free product present in well MW 1 was caused by the <br /> ' accumulation of vapor condensate during the 2 6 years since the well had last been <br /> sampled Wallace Kuhl Associates noted the presence of free product in well MW1 <br /> during the June 14, 1994 sampling event, but did not quantify the amount or thickness <br /> ' of free product present However, historical groundwater sampling data indicates that <br /> there has been no free product at the site from at least 1995 <br /> Criterion 3: Contaminants remaining in the vadose zone cannot migrate in soil vapor or <br /> I ' leach at concentrations that would cause groundwater to exceed water <br /> quality objectives. <br /> ' Over the course of previous site investigations, aquifer els have been measured at <br /> depths of approximately 9 to 22 feet Soil samples collected in 1990 from boring MW1 <br /> contained detectable concentrations of TPHg and benzene at depths of 9 5 to 20 feet bgs <br /> w 121]421reportslclosure doc 20 <br /> I <br />