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�r Quik Stop Station No 039 August 21, 2001 <br /> Stockton California Quarterly Groundwater Monitoring Report <br /> ` (TAME), tert-butanol (TBA), methanol and ethanol by Environmental Protection Agency <br /> • (EPA) Method 8260B <br /> On 22 June 2001, Horizon transported the monitoring well purge water to InStrat, Inc in Rio <br /> Vista, California for disposal A Non-Hazardous Material Profile Sheet was filled out and <br /> accompanied the shipment A payment receipt for acceptance of the purge water was received <br /> by Horizon A copy of the receipt is contained in Attachment D <br /> Results <br /> Depth-to-groundwater measurements were subtracted from the surveyed TOC elevations to <br /> calculate static groundwater elevations Groundwater elevation data was used to construct a <br /> groundwater contour map (Figure 2) <br /> Groundwater analytical results are summarized in Table 1 Copies of the analytical reports <br /> and COC documents are included as Attachment C <br /> Recommendations <br /> Historical groundwater analytical results indicated no reportable benzene or MTBE <br /> concentrations in the three site wells for the past six quarters Horizon recommends <br /> preparation of a Closure Report in accordance with the Tri-Regional Board Staff <br /> • Recommendations for Preliminary Investigation and Evaluation for Underground Tank Sites <br /> —Appendix B No Further Action Requests dated 1 March 1994 <br /> Report Distribution <br /> We recommend a copy of this report be forwarded to <br /> Mr Michael J Infurna <br /> Environmental Health Division <br /> San Joaquin County Public Health Services <br /> P O Box 2009 <br /> Stockton, California 95201 <br /> Mr Gordon Boggs <br /> California Regional Water Quality Control Board <br /> Central Valley Region <br /> 3443 Routier Road, Suite A <br /> Sacramento, California 95827-3098 <br /> 7039gmr01 Q2 doc <br /> 703942 2 HORIZON ENVIRONMENTAL INC <br />