Laserfiche WebLink
. PHONE 285 2400 <br /> CABLE ADDRESS T1.Y,0fL <br /> SEATTLE e (FAX) 206 283 8036 <br /> TACOMA „ I a <br /> PORTLAND <br /> STOCKTONRENOli l� I ToRICHMOND 0 <br /> f <br /> LOS ANGELES y 2 <br /> 1 E TW R C-0 .tr <br /> H a T <br /> 7 6 s 2737 WEST COMMODORE WAY SEATTLE WA 98199-1233 <br /> T <br /> PRODUCTS P O BOX 24447 SEATTLE,WA 98124-0447 <br /> TIME TESTED ^^ <br /> e <br /> April 29, 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 First Quarter 1996 Groundwater Monitoring Report 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 /> (PHSIEHD), 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 groundwater <br /> monitoring j <br /> Please find enclosed Science & Engineering Analysis Corporation's (SECOR's) "Quarterly Monitoring <br /> Report January - March 1996" dated April 22, 1996 This document presents analytical results and field <br /> observations collected during First Quarter 1996 groundwater sampling activities For your convenience <br /> a summary of previous site activities is attached <br /> First Quarter 1996 Groundwater Sampling Results- February 1996 <br /> On February 28, 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 14 ft Ift was encountered in the wells at <br /> depths of 73 27 feet to 84 96 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 15 feet to 0 78 <br /> feet, resulting in an overall increase of 0 78 feet across the site Groundwater flow direction remained <br /> consistent with previously collected data, however, gradient increased significantly The variations in <br /> groundwater elevation and gradient are most likely due to seasonal variation Table 1 in the attached <br /> report summarizes all groundwater elevation data collected to date <br /> Analyses identified 10,000 ppb gasoline, 600 ppb benzene, 2,900 ppb toluene, 440 ppb ethylbenzene, <br /> and 1,900 ppb xylenes in the sample collected from MW-1(located nearest to the existing pump islands) <br /> The sample collected from MW-2, located to the east of the former tank bed (side gradient) contained <br /> 340 ppb gasoline, 38 ppb benzene, 1 6 ppb toluene, 23 ppb ethylbenzene, and 39 ppb xylenes The <br /> sample collected from MW-3, located to the southeast of the former tank bed (downgradient), contained <br /> 2,400 ppb gasoline, 390 ppb benzene, 110 ppb toluene, 170 ppb ethylbenzene, and 200 ppb xylenes, <br /> and the sample collected from MW-4, located to the southwest of the former tank bed (sidegradient), <br />