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C <br /> -�❑ GROUNDWATER <br /> ❑ ❑ TECHNOLOGY, INC. 1401 Halyard Drive,Suite 140 West Sacramento,CA 95691 (916)372A700 <br /> FAX(916)372-8781 <br /> March 4, 1992 Project No 02320 1940 <br /> Mr R R Zielinski <br /> Texaco Environmental Services <br /> 108 Cutting Boulevard <br /> Richmond, CA 94804 <br /> RE QUARTERLY STATUS REPORT (R-1 of 921 <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 quarter of December 1991 through February 1992 Groundwater monitoring and sampling were <br /> conducted to determine water table elevation, the thickness of any separate-phase petroleum <br /> hydrocarbons (SP), and the distribution of dissolved hydrocarbons in the 11 monitoring wells (MWs) <br /> at this site Groundwater monitoring data and results of laboratory analyses of groundwater samples <br /> collected on February 5, 1992, are included <br /> WORK PERFORMED <br /> GROUNDWATER MONITORING <br /> On February 5, 1992, water table elevations at the site were an average of 0 64 foot higher than levels <br /> reported the previous quarter in all MWs except MW-6, in which the water table remained the same <br /> The estimated flow direction of the groundwater is divergent from MW-2 to the northeast Figure 1 <br /> is a potentiometric surface map constructed from the February 5, 1992 monitoring data Table 1 <br /> presents a cumulative summary of the most recent and four preceding quarterly monitoring events <br /> GROUNDWATER SAMPLING <br /> Prior to water-sample collection, the groundwater monitoring wells were purged until pH, temperature <br /> and conductivity readings were stabilized or until dry (Table 2) A U S Environmental Protection <br /> Agency (EPA)-approved Teflon" sampler, cleaned with an industrial detergent and distilled water, was <br /> used for the groundwater sampling The water samples were then transferred to 40-milliliter glass vials <br /> with Teflon"-septum caps, preserved on ice, and transported to a California state-certified laboratory, <br /> accompanied by a chain-of-custody manifest <br /> Offices throughout the U S Canada and Overseas <br />