ARCHIVED REPORTS XR0006101 - Laserfiche WebLink

Home Browse Search

moderately sorted fine to coarse sand that shows graded bedding (fine to coarse with depth) Beneath the B zone aquifer is stiff clay that extends from approximately 27 feet bgs to 40 feet bgs The original five monitor wells did not encounter groundwater in the A zone aquifer when initially drilled and sampled Depth to water measurements taken between 1993 and February 1996 indicate that the A zone aquifer was dry (depth to water greater than 17 feet bgs) MW 1 through MW5 are screened across both the A and B zone aquifers Sometime after February 1996 depth to groundwater measurements indicated that groundwater was in contact with the A zone aquifer, see Table I and Figures 8 and 9 The groundwater in the vicinity of the site is semiconf ned Groundwater elevation at the site vanes from a wet year high of 7 feet bgs (silty clay formation above the A zone) to about 22 - 23 feet bgs (B zone) during the previous drought period Groundwater flow direction in the A zone at the site has generally been to the west since December 1997 The B zone shows a similar flow direction, which would be expected due to the connection between zones at wells MW i through MW5 3"QUARTER 2002 SITE ACTIVITIES Groundwater samples were obtained from all wells associated with 1876 Country Club Blvd during this quarter (August 12, 2002) As requested by San Joaquin County Health, WEGE and Advanced GeoEnvironmental, Inc (AGE) coordinated to obtain depth to water and groundwater samples on the same date WEGE monitored and sampled wells associated with the Sanchez Property, 1876 Country Club Boulevard and AGE sampled and monitored wells associated with Country Club Food and Fuel, 1856 Country Club Boulevard Figure 3 - Site Base Map has been expanded to show the relative positions of the Country Club Food and Fuel wells to the Sanchez Property wells Field notes from site monitoring and sampling can be found in Appendix A DEPTH TO WATER MEASUREMENTS Depth to water was measured at all wells on August 12, 2002 The measurements were made from the surveyed elevation at the top of casing at each well using an electrical air/water interface probe (Table 1) No free product or product sheen was observed in any of the monitor wells Table 1 also presents the Depth to Water measurements obtained from wells located at Country Club Food and Fuel Charts have been developed to show the elevation changes with time for Sanchez wells MW I, MW2, MW3, MW4 and MW5, see Appendix B COLLECTION AND CERTIFIED ANALYSIS OF GROUNDWATER SAMPLES WEGE and Pittman Well Purging (PWP) personnel collected quarterly groundwater samples from the eleven monitor wells at the site on August 12, 2002 See Appendix A 4 QM 3rd 2002