ARCHIVED REPORTS XR0000118 - Laserfiche WebLink

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' Mr Ron Rowe December 3, 1997 I ' near the southwest corner of the main building A 20,000-gallon diesel-fuel tank, was located beneath the parking lot on the east side of the facility The gasoline tanks near the southwest building corner were removed in April 1987 The ' western-most gasoline tank failed a tank integrity test in December 1986 The eastern- most gasoline tank had previously been abandoned in place,prior to 1986, by removing the fuel and filling the tank with sand The two diesel-fuel USTs were removed in ' September 1989 Approximately 450 cubic yards of soil was excavated during removal of the two USTs in ' 1987, of which, approximately 120 cubic yards were impacted by gasoline The soil was allowed to aerate and be disposed of onsite with guidance from the San Joaquin Air Pollution Control District ' In July and September 1987, Environmental Science and Engineering, Inc installed three groundwater monitoring wells (MW-1 through MW-3) In January 1988, Anderson Consulting Group (ACG) installed wells MW-4 and MW-5 ACG later installed wells ' MW-6 and MW-7 in February 1990, and MW-8 in September 1990 Philip (formerly Burlington Environmental) installed wells MW-9 through MW-13 in March 1994 . Philip submitted a Remediation System Pilot Test Workplan, dated July 1, 1994, to the ' San Joaquin County Environmental Health Division (SJCEHD) describing proposed groundwater cleanup technologies These technologies included groundwater sparging combined with soil venting Several sparge and vent wells have been installed to ' implement this remediation However, active cleanup has been postponed due to changes in related California remediation guidelines In Philip's Fourth Quarter 1996, Quarterly Monitoring and Natural Biodegradation tAssessment Report, Philip recommended that passive long-term monitoring be performed, on a semi-annual basis, versus active remediation Continued quarterly monitoring was requested by Mr Ron Rowe of the SJCEHD during a July 8, 1997 meeting at his office 1 MONITORING ACTIVITIES ' Groundwater sampling for this quarterly monitoring event was performed on October 23 and 24, 1997 Prior notification of our intended sampling schedule was provided to Mr Rowe Depth to groundwater and the presence or absence of phase separated hydrocarbons (PSH) were evaluated in each monitoring well Groundwater sampling procedures are ' presented in Appendix A Water sample field data sheets are presented in Appendix B 1