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ARTESIAN ENVIRONMENTAL CONSULTANTS <br /> Date April 1992 <br /> P > <br />' Quarterly Groundwater Monitoring ., <br /> Sampled March 26, 1992 <br /> Former Exxon Service Station 7-3330 WP,_" 77 <br /> 3128 West Benjamin Holt Drive J u N 3 1992 <br /> Stockton, California <br /> Project No 014-02-01 ENVIRONMENTAL kiI-kL I <br /> Prepared for PERM ll <br /> Ms Marla D Guensler <br />' Environmental Engineer <br /> Real Estate and Engineering <br /> Exxon Company, U S A <br />' Post Office Box 4032 <br /> Concord, CA 94524-2032 <br /> This report presents the results of the quarterly monitoring performed on March 26, 1992 <br />' by Artesian Environmental Consultants (Artesian) at the subject site (Figures 1 and 2) <br /> An addendum report with a brief history of the site, work done during this period and <br /> planned site activities is included as Appendix A, Quarterly Summary Report <br /> GROUNDWATER SAMPLING <br /> On March 26, 1992, Artesian staff measured depth to water and purged monitor wells <br /> MW-3 through MW-6 All groundwater samples were collected according to the Artesian <br /> standard operating procedures for groundwater sampling included in Appendix B, The <br /> field sampling and monitoring forms are included as Appendix C <br /> All purged water was temporarily stored in three 55-gallon containers and one 30-gallon <br />' container pending analytical results The groundwater samples were shipped under chain- <br /> of-custody to state-certified Pace Incorporated of Novato, California <br />' GROUNDWATER FLOW <br /> Figure 2 shows the potentiometric surface of shallow groundwater based on depth-to- <br /> water measurements taken on March 26, 1992 The estimated groundwater gradient was <br /> 0 0055 feet per foot for the March sampling event Groundwater-elevation data are <br /> presented in Table 1 The estimated groundwater flow direction at the site in March was <br />' toward the northeast <br /> ANALTYICAL RESULTS <br /> Groundwater samples from monitor wells MW-3 through MW-6 from the March 26, <br /> 1992 event were analyzed for total petroleum hydrocarbons as gasoline (PH-g) <br /> 100 Shoreline Hwy, Suite 295 B • Mill Valley,CA 94941 • (415)381-6456 FAX (415) 389-0423 <br /> i <br />