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r � <br /> GE T TL ER - RYA N INC. <br /> i September 29, 1998 <br /> G-R Job #180138 <br /> Mr. Edward C Ralston <br /> Tosco Marketing Company <br /> 1380 Lead Hill Road, Suite 120 <br /> Roseville, California 95661 <br /> RE Third Quarter 1998 Groundwater Monitoring & Sampling Report <br /> Tosco (Unocal) Service Station #6981 <br /> 4707 Pacific Avenue <br /> Stockton, California <br /> Dear Mr Ralston: <br /> This report documents the quarterly groundwater monitoring and sampling event performed by Gettler-Ryan <br /> Inc (G-R) On July 21, 1998, field personnel monitored thirteen wells (MW-1, MW-2, MW-4 through MW-9, <br /> MW-11, and VW-1 through VW-4) and sampled twelve wells (MW-1, MW-2, MW-4 through MW-9, MW-11, <br /> VW-1, VW-3, and VW-4) at the above referenced site One well (VW-2) was dry <br /> Static groundwater levels were measured and all wells were checked for the presence of separate-phase <br /> hydrocarbons Separate-phase hydrocarbons were not present in the wells Static water level data and <br /> groundwater elevations are summarized in Table 1 A Potentiometric Map is included as Figure 1 <br /> Groundwater samples were collected from the monitoring wells as specified by G-R Standard Operating <br /> Procedure - Groundwater Sampling (attached) The field data sheets are also attached The samples were <br /> analyzed by Sequoia Analytical Analytical results are summarized in Tables 1, 2 and 3 A Concentration Map <br /> is included as Figure 2. The chain of custody document and laboratory analytical reports are also attached <br /> Sinc ly, <br /> Eo Fac <br /> nnading Qct, ,SEN J. <br /> Project Coordinator y� <br /> No.5577 <br /> Stephen J Carter <br /> Senior Geologist, R G No 5577 r��k <br /> Figure 1 Potentiometric Map F CALF <br /> Figure 2 Concentration Map <br /> Table 1 Groundwater Monitoring Data and Analytical Results <br /> Table 2 Groundwater Analytical Results - Oxygenate Compounds <br /> Table 3 Groundwater Analytical Results <br /> (0 Attachments Standard Operating Procedure - Groundwater Sampling <br /> Field Data Sheets <br /> Chain of Custody Document and Laboratory Analytical Reports <br /> 6981 qml <br /> 6747 Sierra Court , Suite J • Dublin , California 94568 ( 925 ) 551 - 7555 <br />