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k E .,E V <br /> ext E""�� - <br /> J u L 1 6 9992 <br /> � <br /> 7 R I TIS GROUNDWATER ENVIRONMENTAL�� ���, <br /> E:11:11:1ERMIS <br /> TECHNOLOGY, INC. PERMIT T isCA9569 <br /> 1401 Halyard Dnve,Suite 140,West Sacramento,CA 95691,(916)372-4700 <br /> FAX(916)372-8781 <br /> June 29, 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-2 of 92) <br /> TEXACO SERVICE STATION <br /> 440 WEST CHARTER WAY <br /> STOCKTON, CALIFORNIA <br /> Dear Mr Zielinski <br /> 01 This letter is presented as a quarterly report on groundwater conditions at the site referenced <br /> above for the quarter of April through June 1992 During this quarter four nested soil vapor <br /> extraction wells were installed Groundwater monitoring and sampling were conducted to <br /> determine water table elevation, the thickness of any separate-phase petroleum hydrocarbons <br /> (SP), and the distribution of dissolved hydrocarbons in the 11 monitoring wells (MWs) at this <br /> site Groundwater monitoring data and results of laboratory analyses of groundwater samples <br /> collected on May 15, 1992, are included <br /> WORK PERFORMED <br /> SOIL VAPOR EXTRACTION WELL INSTALLATION <br /> i <br /> On April 27-28, 1992, four nested soil vapor extraction wells were drilled and installed at the <br /> site (Figure 1) The nested extraction wells were constructed with 10 feet of 4-inch-diameter, <br /> schedule 40 PVC, 0 020-inch-slot well screen, and 4-inch-diameter, schedule 40 PVC casing to <br /> surface VE-2, VE-3 and VE-4 were installed with the screened intervals positioned at depths <br /> of 15 to 25 feet below ground surface (BGS) and 30 5 to 40 5 feet BGS VE-1 was installed <br /> with the screened intervals positioned at depths of 13 5 to 23 5 feet BGS and 30 5 to 40 5 <br /> feet BGS A sand pack was placed around and approximately 1 foot above each section of <br /> screen using #3 Monterey sand Approximately three feet of bentonite seal separates the two <br /> screened intervals with a 1 '/2-foot bentonite seal above the upper sand pack <br /> Offices throughout the U S,Canada and Overseas <br />