ARCHIVED REPORTS XR0006112 - Laserfiche WebLink

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i PURPOSE AND SCOPE The following report documents the Third Quarter 2004 groundwater monitoring Four new cluster wells (MWBA, MWBB, MW9A and MW9B) and an excavation well (MWIO) were installed prior to the depth to water measurements and groundwater sampling conducted on July 15, 2004 All wells associated with this site were then surveyed by Morrow Surveying on September 24, 2004 SITE LOCATION AND DESCRIPTION The site address is 1876 Country Club Blvd , Stockton, CA It is located at the southeast corner of the intersection of Mission Street and Country Club Blvd (Figure 1) The property is located in projected Section 4, TIN, R6E of the MDB&M at approximately five feet above mean sea level The north corner of the property at Country Club Blvd and Mission Road is at N370 58 044' Latitude and W121019 393' Longitude (Delorme sa 7 0) On May 1, 2001 Land Surveyors Kjeldsen, Sinnock & Neudeck, Inc surveyed the positions, top of casing and surface elevations of all wells associated with this site After installations of new wells MWBA, MWBB, MW9A, MW913 and MWIO the site was resurveyed by Morrow Surveying on September 24, 2004 Elevation differences occurred for all old wells surveyed, see Appendix F Figures 3 and Table i has been revised to this new survey All associated figures showing site conditions are based on the new Figure 3 The property previously contained two 1000 gallon gasoline Underground Storage Tanks (UST's), product dispensers, and associated underground piping (Figure 3) The UST's, dispensers, and piping were removed from the site in 1989 Over-excavation of gasoline contaminated soils associated with the USTs and former pump islands occurred during the month of February 2003, removing an estimated 638 tons of gasoline contaminated soils from above and below the water table (maximum depth of excavation 30 feet below surface) The property owner originally installed five onsite monitoring wells Three additional cluster wells and four piezometers were installed to aid in the investigation of soil and groundwater conditions at the site Prior to over-excavation monitor well MW i was destroyed by over drilling and during excavating cluster wells RIA and RIB along with piezometers PZ1A, PZIB, PZ2A and PZ2B were removed by excavating, removing all well materials At the current time the following are the remaining active wells for this site MW2, MW3, MW4, MWS, MW6A, MW6B, MW7A, MW7B, MWBA, MWBB, MW9A, MW9B and MW 10 3 Sanchez QM 3rd 2004