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,01 JAN�926 ' 99 I1 OG FROM GETTLER-RYAN INC TO 14158821856 PAGE 082/01 ^ <br /> 6ETTLER - RYAN INC. <br /> Mr EdwardJanuary 27, 1999 C Ralston G-R lob #180137 <br /> Tosco Marketing Company <br /> 1380 Lead Hill Road, Suite 120 <br /> Roseville, California 95661 <br /> RE Fourth Quarter 1998 Groundwater Monitoring & Sampling Report <br /> Tosco (Unocal) Service Station 95886 <br /> 2701 West March Lane <br /> Stockton, California <br /> Dear Mr Ralston <br /> This report documents the quarterly groundwater monitoring and sampling event performed by Gettler- <br /> Ryan, Inc (G-R) On December 3, 3998, field personnel monitored and sampled eleven wells (MW-1, MW_ <br /> 2, MW-3 MWAD, MW-4S,MW-5D, MW-5S, MW-6D,MW-6S, MW-7D, and MVS'-7S)at the referenced <br /> site <br /> Static groundwater le-.els 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 Potentiornetric Map is included as Figure 1 <br /> Groundwater samples were collected from the monitoring wells as specified by 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 and 2, and a Concentration <br /> Map is included as Figure 2 The chain of custody document and Iaboratory analytical reports are also <br /> attached <br /> Sincerely <br /> Deanna L Harding <br /> Project Coordinator <br /> Stephen J Carter <br /> Senior Geologist, R G No 5577 <br /> Figure 1 Potentiometric Map <br /> Figure 2 Concentration Map <br /> Table 1 Groundwater Monitoring Data and Analytical Results <br /> Table 2 Groundwater Analytical Results - Oxygenate Compounds <br /> Attachments Standard Operating Procedure - Groundwater Sampling <br /> Field Data Sheets <br /> 'M gmi Chain of Custody Document and Laboratory Analytical Reports <br /> 6747 Sierra Court Suite J Dublin California 94568 - ( 925) 551 - 7555 <br />