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RM <br /> 2, HIMMY151, <br /> "ar.. NO- <br /> M MIe - € - 05 <br /> -- <br /> Harding Lawson AssmAntos <br /> V SURFACE AND SUBSURFACE CONDITIONS <br /> The 7-Eleven facility at 455 West Grant Line Road consists of a convenience <br /> store, gasoline station, asphalt-covered parking and driveway areas, and land- <br /> scaped areas along the corners of the property. The site is bounded by paved <br /> is streets on the east and south and by vacant lc's on the north and west. <br /> The borings were drilled in the I;lydscaped area near each corner of the <br /> property. These areas consic} <br /> ... of bark chips overlying black plastic and ' <br /> } several shrubs. n!,� borings encountered stiff to very stiff clays with vari- <br /> �'r +ractions of sand and thin sands to the.maximum dP <br /> y <br /> "~ nth explored (25 feet) ' <br /> The only,significant variation was at MW-3, where a silty sane l yer nas <br /> 5 encountered between 8 to to feet. <br /> S r <br /> .G, <br /> MW-1 is locat5d adjacent to a. dry well that originally <br /> drained surface <br /> water frLqn the paved area. During drilling operations', we observed a Plugged <br /> p gged <br /> underground pipe that extends fray the dry well to the storm drain an Suthmann <br /> , . <br /> Avenue. Both the aly well and the.outlet are plug <br /> gea with silt and are no <br /> longer providing drainage. <br /> [;. By surveying the tops of thii-monitoring wells and accurately measuring the <br /> E water levels' we have determined that the direction of <br /> r � � ground-water flow is to <br /> the north-northeast ~ about.at a gradient of . <br />`®® � a � "` feet per foot' The depth to . <br /> r ,d elevation data is preseii,ted in the following table, <br /> . <br /> ground water_ �;.r <br /> { <br /> i <br /> r <br /> i <br /> AT�i t <br />