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PHONE 285-2400 <br /> CABLE ADDRESS TIMOIL <br /> SEATTLE T (FAX) 206 283 8036 <br /> l TACOMA EN P+; <br /> PORTLAND " - ' i 1_ nr-}t P <br /> STOCKTON 1 i2 ?o 'RENO . r rif <br /> LOS ANGELES 9 Z3 of TIME O , �` co • <br /> 7 6 5 TS <br /> T 2737 WEST COMMODORE WAY SEATTLE,WA 98199-1233 <br /> PRODUCTS <br /> 'TS P O BOX 24447 SEATTLE,WA 98124-0447 <br /> TIME TESTED ^^ <br /> E <br /> July 31, 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- Second Quarter 1995 and <br /> Quarterly Status Report- Second Quarter 1995 for <br /> Jackpot Food Mart, 1434 W Yosemite Ave , Manteca, CA (Property No 04-167) <br /> Dear Mr Knoll, <br /> On June 20, 1994, the San Joaquin County Public Health Services Environmental Health Division <br /> (PHSIEHD) requested that Time Oil implement quarterly status reporting and conduct groundwater <br /> monitonng 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 Monitonng <br /> Report, April - June 1995" dated July 13, 1995 This report presents analytical results and field <br /> observations collected during Second Quarter 1995 sampling activities For your convenience a <br /> summary of previous site activities is attached <br /> Groundwater Sampling Results- May 1995 <br /> On May 23, 1995, samples were collected from each of the monitonng wells at the subject site Pnor to <br /> purging, the depth to groundwater in each well was measured by a representative of SECOR to assist in <br /> evaluating changes in elevation, Flow direction, and gradient As noted in the attached report, <br /> groundwater was encountered at 12 92 feet to 14 05 feet below ground surface <br /> Since the previous sampling event, groundwater elevation has decreased across the site by an average <br /> of 0 96 feet and flow direction has changed from northeast to north The change in flow direction is <br /> consistent with that observed in previous sampling events and is most likely a result of seasonal <br /> variation The rise in groundwater elevation is probably due to heavy rainfall dunng the winter months <br /> Table 1 in the attached report summarizes all groundwater elevation data collected to date <br /> Neither gasoline nor its constituents were detected in any of the samples collected Table 2 in SECOR's <br /> report summarizes all groundwater data collected to date, and Appendix B contains analytical reports <br /> 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 concem and this <br /> sampling event represents the fourth consecutive quarter where hydrocarbons have not been in any of <br /> the groundwater monitoring wells,Time Oil requests that the PHSIEHD consider reducing the monitonng <br />. frequency to biannually until remediation of the site's soils has been achieved <br /> it <br />