Laserfiche WebLink
CA h_ r.7 7-a_SS O' <br /> SEATTLE - — E if riY; ?03 X93 8032 <br /> TACOMA r <br /> PORTLAND r t i <br /> . STOCKTOtt' <br /> 3EN0 ' o r O I L �•F O • <br /> iICIiMOND ND 3 a <br /> LDS ANGELES `� l � <br /> TIME <br /> T <br /> Ts 2737 WEST COMMODORE WAY SEATTLE WA 98199 1233 <br /> PRoauCTS PO BOX 24447 SEATTLE WA 98124-0447 <br /> TIME TESTM iM <br /> E <br /> July 19, 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, 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 monitonng <br /> Please find enclosed Science & Engineering Analysis Corporation's (SECOR) "Quarterly Monitoring <br /> Report, April - June 1995" dated July 13, 1995 This document 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 monitoring wells at the subject site Prior 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 75 40 feet to 86 62 feet below ground surface Although groundwater <br /> levels rose in some wells and fell in others since the previous sampling event, groundwater elevation <br /> decreased across the site by an average of 2 17 feet Consistent with previous findings, groundwater <br /> flow remained to the southeast with a gradient of 0 15 ft/ft Table 1 in the attached report summarizes <br /> all groundwater elevation data collected to date <br /> Analyses identified gasoline and its constituents in groundwater samples collected from each of the <br /> monitoring wells MW-1, located nearest the existing pump islands was found to contain 9,200 ppb <br /> gasoline, 440 ppb benzene, 1,900 ppb toluene, 280 ppb ethylbenzene, and 1,100 ppb xylenes <br /> Perimeter wells MW-2, MW-3, and MW-4, located sidegradient and downgradlent of the former tanks <br /> were found to contain 55 ppb to 320 ppb gasoline, 0 7 to 13 ppb benzene, as well as low concentrations <br /> of toluene, ethylbenzene, and xylenes Table 2 in SECOR's report summarizes all groundwater data <br /> collected to date, and Attachment 2 contains analytical reports from the most recent sampling event <br /> The locations of the wells are presented on Figure 2 <br />