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r� THRIFTY OIL CO. <br /> December 15, 1995 <br /> Mr Mike Infurna <br /> Public Health Services/Environmental Health Division <br /> County of San Joaquin <br /> P O Box 2009 (1601 E Hazelton Ave } <br /> Stockton, California 95201 <br /> RE Thrifty Oil Conwan y Station #7 72 <br /> 7647 Pacific. A venue <br /> Stockton, CA 95207 <br /> Quarterly Monitoring Report <br /> 4th Quarter 1995 <br /> Dear Mr Infurna <br /> This letter serves as a quarterly monitor ing i eport foi the above mentioned service station This <br /> status report presents site monitoring efforts dui ing the 4th quarter 1995 Thrifty Oil Co has retained <br /> Earth Management Co (EMC) to conduct quarterly monitoi ing and sampling activities at the site <br /> The data is reported by Thtifty's in-house environmental staff' <br /> SITE REMEDIATION <br /> To date, i emediation of soil and groundwater has not been conducted at the site In July 1995, <br /> Thrifty completed a subsurface investigation that included installation of thi ee new off-site wells <br /> (MW5, 1\4W6 and MW9) and abandonment of six on-site wells This work was preliminary to site <br /> reconstruction efforts which included removal and replacement of the underground tanks and <br /> construction of a new market building Thi fifty's SUbsUI face Investigation Report dated September <br /> 6, 1995 contains details regarding this investigation Thrifty plans to install new groundwater and <br /> vapor wells early in 1996 at this site, and a wot I<plan will be submitted foi your review and approval <br /> The remediation compound and the vapor and groundwater piping has been installed and completed <br /> GROUNDWATER MONITORING <br /> On November 11, 1995, the site was visited by an Eaith Management Co (EMC) technician The <br /> EMC technician obtained depth to groundwatei data and obsei ved wells for the presence of free <br /> product Groundwater depth measurements wei e taken fi orn the top of PVC well casing using an <br /> Oil Recovery Systems interface probe capable of measui ements to within 0 01 feet Depth to <br /> groundwater fanged from 46 62 to 48 62 feet below grade which iepi esents a slight rise from the last <br /> reported data Free product was not encountered Using the depth to groundwater and survey data <br /> QO <br /> 10,000 Lakewood Boulevard, Downey, CA 90240 4082 9 (310) 923-9876 <br />