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WESTERN 1386 EAS r BEAMER STI T <br /> T WOODLANll CA 95776-6003 <br /> GEO-EIS GNEERS (530) 668=5300, <br /> CALIF CONTRAC IOR#513857 i �/FAXk{S 016M- 273 <br /> REGISTERED GEOLOGISTS Wege mother c.om <br /> November 17, 1997 <br /> Mr John Margowski <br /> Wickland Properties <br /> P O Box 13648 <br /> Sacramento, California 95853-4648 <br /> (916) 2485, FAX (916) 978-2428 <br /> RE Update Status Report#49, Scl)tember 1997 Quarterly Report for former Regal Station #603, <br /> 6425 Pacific Avenue, Stockton, California <br /> Dear Mr Margowski' <br /> INTRODUCTION <br /> This update, STATUS REPORT 949, presents data collected from July 22, to October 3, 1997 and <br /> includes the Quarterly Groundwater Sampling, Vapor Extraction System Monitoring and Venting of <br /> MW$ <br /> The previous report (CONFIRMATION OF THE EFFECTS OF THE VAPOR EXTRACTION <br /> SYSTEM, dated July 31, 1997) documented our findings from the soil boring samples obtained to <br /> confirm the effectiveness of the operating Vapor Extraction System (VES) at the above mentioned <br /> site Drilling/sampling occurred on June 4 and 5, 1997 Four borings were drilled and sampled <br /> One of these borings (S137) was converted into a two inch vapor extraction/sparging well and <br /> renamed M W 13 <br /> SITE LOCATION <br /> Former Regal Station 4603, is an operating EXXON servide station located at 6425 Pacific Avenue <br /> at the northwest corner of Pacific Avenue and Douglas Road, Stockton, in San JoagtWh County, <br /> California The site lies in section 21, T2N, R6E; MDB&M at approximately 12 feet above mean <br /> sea level (MSL), see Figures 1, 2 and 3 The parcel is#31 and can be located in Assessor's Book 97 <br /> GROUNDWATER MONITORING <br /> Depths to groundwater measurements along with vacuum influence measurements were obtained <br /> from MW 1, MW2, MW3, MW8, MW 10 and MW12 on September 23, 1997 Corrections for <br /> vacuum were necessary for the depth to water measurements, see Appendix A — Field Notes and <br /> Methods and Procedures Figure 4 represents the groundwater gradient obtained from <br /> measurements obtained on September 23, 1997 and shows flow direction to the southeast and west <br /> from MW2 towards MW5 and MW 1 respectively <br /> 1 <br />