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ANN WESTERN 1386 EAS I BLAMLR S MEL I <br /> SEC)-EIVCiINEERS WOODLAND CA 95776-6W3(530) 668-5300, <br /> CA[ IF CONIRAC rOR 9513857 I'AX(530)602-0273 <br /> Uzi <br /> REGIS 17 nD GI,Ot OGiS IS wep-qhpother wm <br /> Mr Michael J Infurna Jr January 10, 2002 <br /> Senior RE1-1S <br /> Leaking Underground Fuel Storage Tank Program <br /> San Joaquin County Public Health '^ } <br /> Environmental Health Division (PHS-EHD) 0�1 _ <br /> 304 East Weber Ave , Third Floor �r j <br /> Stockton, CA 95202 <br /> (209)468-3454 c <br /> RE Revision to November 27, 2000 Workplan for limited over-excavation during installation of <br /> air sparging/vapor extraction trench in fonner UST area at the Sanchca property, 1876 Country <br /> Club Blvd , Stockton, CA <br /> Dear Mr Infurna <br /> INTRODUCTION <br /> The November 27, 2001 workplan was developed to perform limited over-excavation in the former <br /> UST area to remove gasoline range contaminated soils and help expedite the remediation efforts <br /> Prior to excavating, a pump test was to be performed to define the pump rate necessary for <br /> dewatering the area to be excavated Preliminary modeling indicated that monitor wells NMI, <br /> MW2 and MW3 should be destroyed prior to performing the pump test These wells connect the <br /> first and second water zones acting as conduits that will rapidly charge (replenish) the first water <br /> zone from the greater capacity second water zone, see Appendix A - Pre-aquifer test modeling <br /> The following revision describes the well destruction methods <br /> i <br /> LOCATION <br /> The address of this Sanchez site is 1876 Country Club Blvd , Stockton, CA It is located at the <br /> southeast corner of the intersection of Mission Street and Country Club Blvd (Figure 1) The <br /> property is located in projected Section 4, TIN, R6E of the MDB&M at approximately five feet <br /> above mean sea level (Figure 2) <br /> The property previously contained two 1000 gallon gasoline Underground Storage Tanks (UST's), <br /> product dispensers, and associated underground piping (Figure 3) The UST's, dispensers, and <br /> piping were removed from the site in 1989 <br /> 1 Sandif Well Dest 1-10-02, <br />