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�^ PHONE 285 2400 <br /> ! CABLE ADDRESS TIMOIL <br /> SEATTLE e (FAX) 206 283 8036 <br /> TACOMA N <br /> PORTLAND him <br /> STOCKTON <br /> RENO LRICHMOND 0 <br /> OS ANGELES �*N4 <br /> "ETIME oIL co . <br /> TS 2737 WEST COMMODORE WAY SEATTLE WA 98199-1233 <br /> PRODUCTS IM P O BOX 24447 SEATTLE, WA 98124-0447 <br /> TrMeTEsrO E December 14, 1995 <br /> Mr Harlan Knoll _ <br /> San Joaquin County Public Health Services <br /> Environmental Health Division ' <br /> P O Box 2009 <br /> Stockton, California 95201 ' <br /> RE Submittal of Groundwater Monitoring Report -Third Quarter 1995 for 7 <br /> Jackpot Food Mart, 1434 W Yosemite Ave , Manteca, CA (Property No 04-167) <br /> -Y <br /> 7r I 1 <br /> X^ <br /> Dear Mr Knoll, �n <br /> On June 20, 1994, the San Joaquin County Public Health Services Environmental Health Division <br /> (PHS/EHD) requested that Time Oil implement quarterly status reporting and conduct groundwater <br /> monitoring until cleanup of the above-referenced site has been achieved Accordingly, this letter is <br /> intended to satisfy the requirements for quarterly status reporting as outlined in Article 5, Section 2652 of <br /> the California Underground Storage Tank Regulations <br /> Please find enclosed Science & Engineering Analysis Corporation's (SECOR) "Quarterly Monitoring <br />• Report, July - September 1995° dated December 11, 1995 This report presents analytical results and <br /> field observations collected during Third Quarter 1995 sampling activities For your convenience a <br /> summary of previous site activities is attached <br /> Groundwater Sampling Results- September 1995 <br /> On October 5, 1995, samples were collected from each of the groundwater monitoring wells at the <br /> subject site Prior to purging, the depth to groundwater in each well was measured by a representative of <br /> SECOR to assist in evaluating changes in elevation, flow direction, and gradient As noted in the <br /> attached report, groundwater was encountered at 16 00 feet to 17 36 feet below ground surface <br /> Since the previous sampling event, groundwater elevation has decreased across the site by an average <br /> of 3 17 feet Consistent with previous data, flow direction has remained to the northeast at a rate of <br /> 0 002 ft/ft The fall in groundwater elevation is most likely due to the lack of rainfall during the summer <br /> months Table 1 in the attached report summarizes all groundwater elevation data collected to date <br /> Hydrocarbons were not detected in groundwater samples collected from any of the wells Table 2 in <br /> SECOR's report summarizes all groundwater data collected to date, and Appendix B contains analytical <br /> reports from the most recent sampling event The locations of the wells are presented on Figure 2 <br /> Because hydrocarbons have never been observed in groundwater at concentrations of concern and this <br /> sampling event represents the fifth consecutive quarter where hydrocarbons have not been detected in <br /> any of the groundwater monitoring wells, Time Oil requests that the PHS/EHD reduce the required <br /> monitoring frequency to biannually until remediation of the site's soils has been achieved <br /> Remedial Activities- Third Quarter 1995 <br />• A contractor has been selected for the installation of the proposed vapor extraction system SECOR Is <br /> currently obtaining permits for the installation of a natural gas line to provide supplemental fuel for the <br /> thermal oxydizer which will be utilized to treat hydrocarbons recovered during remedial activities <br />