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y� <br /> 6ETTLER - RYAN' <br /> NC. <br /> February 6, 1998 <br /> Mr. Edward C. Ralston G-R Job #1. 80139 <br /> Tosca Marketing Company <br /> 2000 Crow Canyon Place, Suite 200 <br /> San Ramon, California 94583 <br /> RE: Annual 1997 Groundwater Monitoring& Sampling Report <br /> Unocal Service Station#5421 <br /> 7303 Pacific Avenue <br /> Stockton, California <br /> Dear Mr. Ralston: <br /> This report documents the annual groundwater monitoring and sampling event performed by MPDS <br /> Services, Inc. On December 10, 1997, MPDS field personnel monitored and sampled four wells (MW1 <br /> through MW4) at the referenced site. <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 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 2 and 3, and a Concentration <br /> Map is included as Figure 2. The chain of custody document and Iaboratory analytical reports are also <br /> attached. <br /> erely, <br /> eanna L. Harding <br /> Project Manager <br /> _,�,pFESS/o <br /> Qua Op KCL q�F <br /> Hagop evork, P.E. 0-p �0 <br /> co <br /> Senior Staff Engineer, P.E. No. C55734 G <br /> UJ No. C 55734 m <br /> Figure 1: Potentiometric Map * Exp. <br /> Figure 2: Concentration Map s Q <br /> Table 1: Summary of Monitoring Data TgTF CMI <br /> Table 2: Summary of Laboratory Analyses OF C <br /> Table 3: Summary of Laboratory Analyses <br /> Attachments: Standard Operating Procedure - Groundwater Sampling <br /> Field Data Sheets <br /> Chain of Custody Document and Laboratory Analytical Reports <br /> 6747 Sierra Court , Suite J & Dublin , California 94568 (510 ) 551 -7555 <br />