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❑� GROUNDWATER <br /> ❑O❑ TECHNOLOGY ® Groundwater Technology,Inc <br /> 1401 Halyard Drive,Suite 140,West Sacramento,GA 95691 USA <br /> Tel (916)372-4700 Fax (916)372-8781 <br /> January 23, 1996 <br /> Mr Bob Vasquez <br /> The Southland Corporation <br /> 3146 Gold Camp Road, Suite 300 <br /> Rancho Cordova,CA 95670 <br /> Subject Fourth Quarter 1995 Monitonng and Sampling Report <br /> Southland Site No 20680 <br /> 9110 Thornton Road <br /> Stockton, California <br /> GTI Project No 02070 0133 <br /> Dear Mr Vasquez <br /> This letter describes the methods and results of monitoring and sampling activities performed by <br /> Groundwater Technology, Inc during the fourth quarter of 1995 at The Southland Corporation <br /> (Southland) Site No 20680 located at 9110 Thornton Road in Stockton, Chiia (Fgures I beloved 2, <br /> d is <br /> Attachment 1) A summary of activities conducted during this reporting p provided <br /> ■ Depth to water(DTW) was gauged in 19 groundwater monitoring wells and 4 former <br /> pumping/recovery wells <br /> Groundwater samples were collected from 18 groundwater monitoring wells and the 4 <br /> former pumping/recovery wells The samples were submitted and analyzed for <br /> benzene,toluene, ethylbenzene and xylenes (BTEX), and total petroleum <br /> hydrocarbons-as-gasoline (TPH-G) <br /> Groundwater Monitoring Data <br /> Groundwater mondonng was conducted on December 11, 1995 The wells were gauged to determing <br /> DTW and to check for the presence of separate-phase hydrocarbons (SP) The wills were mondorad <br /> using an INTERFACE PROBET Well Monitoring System,which uses a dual optkcgl%erMrlconducWrty <br /> probe to distinguish between water and petroleum pllttducts A potenbometno Waoe map was <br /> generated using data from top of casing elevabons,and DTW�reasurements (Figure 2) <br /> Based on monitoring data collected from the site-relied wells.grourKWater flow diverges f Qm the slke <br /> to the east and southeast at a gradient of 0 006 ft/ft leo 3R Wis found in any of the mondorl a Wells <br /> Groundwater levels increased approximately 1 foot since the previous quartwly m9nitgnng went <br /> (September 6, 1995) Histoncal and recent groundwater mondonng data ara,summanzed in Table 1 <br /> (Attachment 2) Field Data sheets are included in Attachment 3 <br /> 0133a495 rpc(SIN-61) <br /> Offices throughout the US Canada and Overseas <br />