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r PHONE 285 2400 <br /> CABLE ADDRESS Tisa 01L <br /> SEATTLET <br /> (FAKE 206 283 8036 <br /> — <br /> TACOMA ami <br /> EN I-�� <br /> PORTLAND t <br /> STOCKTONM*"12 TC <br /> RENO RICHMOND 1�LOS ANGELES "f rf JCoo <br /> 5 2737 WEST COMMODORE WAY SEATTLE WA 98199-1233 <br /> T <br /> PRODUCTS P O BOX 24447 SEATTLE,WA 98124 0447 <br /> TIME TESTED M <br /> E <br /> January 25, 1996 <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 Monitonng Report and <br /> Workplan for Additional Environmental Investigation -Third Quarter 1995, <br /> Results of Quarterly Groundwater Sampling - Fourth Quarter 1995, and <br /> Quarterly Status Report- Fourth Quarter 1995 for <br /> Jackpot Food Mart, 14000 E Highway 88, Lockeford, California (Property No 04-049) <br /> Dear Mr Knoll, <br /> At the request of the San Joaquin County Public Health Services Environmental Health Division <br /> (PHS/EHD), an additional environmental investigation was implemented at the subject site in December <br /> 1994 to evaluate the extent of hydrocarbon-Impacted soils and to determine whether or not groundwater <br /> had been impacted Based on the results of the investigation, Time Oil has implemented quarterly status <br /> reporting and quarterly groundwater monitoring <br /> Please find enclosed Science & Engineering Analysis Corporation's (SECOR's) "Quarterly Status Report <br /> and Work Plan for Additional Environmental Investigation" dated January 9, 1996 This document <br /> presents analytical results and field observations collected dunng Third Quarter 1995 sampling activities <br /> It also includes a workplan for an additional investigation at the subject site to assist in further evaluating <br /> the extent of petroleum-Impacted soil and groundwater associated with the former underground storage <br /> tank system For your convenience a summary of previous site activities Is attached <br /> Third Quarter 1995 Groundwater Sampling Results- October 1995 <br /> On October 4, 1995, samples were collected from each of the groundwater monitoring wells (MW-1 <br /> through MW-4) at the subject site by a representative of SECOR Prior to purging, the depth to water in <br /> each well was measured to evaluate elevation, flow direction, and gradient As noted in the attached <br /> report, groundwater with a southeasterly flow at a rate of 0 15 ft/ft was encountered in the wells at <br /> depths of 77 21 feet to 85 88 feet below ground surface The location of the wells is identified on Figure <br /> 2 of the attached report <br /> Since the previous sampling event, groundwater elevation increased in each well by 0 62 feet to 9 41 <br /> feet, or an overall average increase of 3 27 feet across the site The rise in groundwater elevation is <br /> most likely due to seasonal variation Groundwater flow direction and gradient remained consistent with <br /> Previously collected data Table 1 in the attached report summanzes all groundwater elevation data <br /> collected to date <br />. Analyses Identified gasoline and its constituents In groundwater samples collected from each of the <br /> monitonng wells MW-1, located nearest to the existing pump Islands, was found to contain 8,200 ppb <br />