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n <br /> GET TL ER - RYAN INC. <br /> March 31, 2000 <br /> G-R Job #180137 <br /> Mr Edward C Ralston <br /> Tosco Marketing Company <br /> 1380 Lead Hill Road, Suite 120 <br /> Roseville, California 95661 <br /> RE First Quarter 2000 Groundwater Monitoring& Sampling Report <br /> Tosco(Unocal) Service Station#5886 <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-Ryan,Inc <br /> (G-R) On February 28 and 29, 2000, field personnel monitored and sampled twenty wells(MW-I,MW-2, <br /> MW-3,MW-4D,MW-4S,MW-5D,MW-5S,MW-6D,MW-6S,MW-7D,MW-7S,MW-8S,MW-8I,MW-8D, <br /> MW-9S,MW-9I,MW-9D,MW-10S,MW-10I and MW-10D)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 Potentiometnc Map is included as Figure 1 <br /> Groundwater samples were collected from the monitoring wells as specified by Standard Operating Procedure- <br /> P g <br /> Groundwater Sampling (attached) The field data sheets are also attached The samples were analyzed by <br /> Sequoia Analytical Analytical results are summarized in Tables 1 and 2, and a Concentration Map is included <br /> as Figure 2 The chain of custody document and laboratory analytical reports are also attached <br /> Sincerely, <br /> vv� <br /> Deanna L Harding �E�IED FO <br /> Project Coordinator ��oJGLAS J\1 IOC�'r► <br /> O <br /> No. 6882 <br /> Dougl J Lee <br /> Senior Geologist, R.G No 6882 <br /> Figure I Potentiometnc Map OF CAI. <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 /> 5886 qml Chain of Custody Document and Laboratory Analytical Reports <br /> 6747 Sierra Court , Suite J • Dublin , California 94568 ( 925 ) 551 -7555 <br />