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F !r <br /> r4 <br /> PERM <br /> MAR 1 3 <br /> r GROUNDWATER RNVIRQ�i�1ENTAL HEALTH <br /> PERMIT"/sCRI/IcEs <br /> E11:11:1. TECHNOLOGY INC. 1401 Halyard D <br /> � y rive,Suite 140 West Sacramento,CA 95691,(91fi)3724700 <br /> FAX(916)372-8781 <br /> February 8, 1993 Project No 02020 3294 <br /> Mr R R Zielinski <br /> Texaco Environmental Services <br /> 108 Cutting Boulevard <br /> Richmond, CA 94804 <br /> RE- QUARTERLY STATUS REPORT <br /> TEXACO SERVICE STATION <br /> 440 WEST CHARTER WAY <br /> STOCKTON, CALIFORNIA <br /> Dear Mr Zielinski <br /> This letter is presented as a quarterly report on groundwater conditions at the site referenced above <br /> for the period of July through December 1992 Because of the transition of quarterly monitoring and <br /> sampling activities from another consultant to Groundwater Technology, no report has been <br /> generated since June 1992 Groundwater monitoring and sampling were conducted to determine <br /> water table elevation, the thickness of any separate-phase petroleum hydrocarbons (SP), and the <br /> distribution of dissolved hydrocarbons in the 11 monitoring wells (MWs) at this site Groundwater <br /> monitoring data from October 15 and December 17, 1992 and results of laboratory analyses of <br /> groundwater samples collected on December 17, 1992 are included <br /> WORK PERFORMED <br /> GROUNDWATER MONITORING <br /> On December 17, 1992, water table elevations at the site were an average of 0 19 foot lower than <br /> levels monitored on October 15, 1992 in monitoring wells MW-1, MW-2, MW-3, MW-4, MW-5, and <br /> MW-7 The water table elevations increased an average of 0 16 foot in the remaining monitoring <br /> wells The estimated flow direction of the groundwater is divergent from MW-2 but dominantly to the <br /> east and northeast Figures 1 and 2 are potentiometric surface maps constructed from the October <br /> 15 and December 17, 1992 monitoring data, respectively Table 1 presents a cumulative summary of <br /> the quarterly monitoring events <br /> GROUNDWATER SAMPLING <br /> Prior to water-sample collection, the groundwater monitoring wells were purged until pH, <br /> temperature and conductivity readings were stabilized or until dry (Table 2) A Teflon" sampler, <br /> Offices throughout the U S Canada and Overseas <br />