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STATF,,)F-,1lAEORNIA GEORGE DEUKMEJIAN,Governor <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD— <br /> CENTRAL VALLEY REGION <®� <br /> 3443 ROUTER ROAD � <br /> SACRAMENTO,CA 95827-30981;314. \�/ ,y l <br /> 17 April 1989 y" ` <br /> APR 19 1989 <br /> ENVIRONMENTF:I <br /> PERM1T/SERVK--ij- <br /> Ms. Lisa Marinaro <br /> Chevron USA Inc. <br /> 2410 Camino Ramon <br /> San Ramon, CA 94583 <br /> WORK PLAN FOR SUBSURFACE INVESTIGATION AT FORMER CHEVRON STATION #4054, <br /> 2103 COUNTRY CLUB BOULEVARD, STOCKTON, SAN JOAQUIN COUNTY <br /> Thank you for submitting the 10 January 1989 work plan for our review. The <br /> work plan proposes to install an unspecified number of monitoring wells at <br /> locations to be selected based on the results of a proposed soil gas <br /> investigation. Unfortunately, we cannot accept the work plan because it does <br /> not specifically identify the locations or number of proposed monitoring <br /> wells. <br /> We suggest that, if you wish to use the results of a soil vapor investigation <br /> to select monitoring well locations, conduct the soil vapor investigation and <br /> then develop a work plan for the installation of the monitoring wells. All <br /> necessary permits to conduct a soil vapor investigation are to be obtained <br /> from the San Joaquin Local Health District (SJLHD) . <br /> Upon completion of the soil vapor investigation, submit a revised work plan to <br /> us and the SJLHD. The revised work plan is to propose work which will fully <br /> define the extent of ground water and soil contamination at this site so a <br /> complete and comprehensive Problem Assessment Report (PAR) can be developed. <br /> In addition to the information provided in the 10 January 1989 work plan, the <br /> revised work plan is to include the following: <br /> 1 . A. site map (to scale) showing the location of each proposed monitoring <br /> well and soil boring, as well as existing monitoring well and soil <br /> boring locations. The proposed monitoring wells are to be sufficient in <br /> number and strategically located to define the extent of the ground <br /> water plume. <br /> 2. Provide a well construction diagram which includes specific information, <br /> such as the thickness of the bentonite seal , grout seal , sand pack, etc. <br /> 3. Specify the proposed analytical methods for benzene, toluene, xylene, <br /> and ethylbenzene (BTX&E) and total petroleum hydrocarbon (TPH) analysis <br /> for soil and water. <br /> 4. Investigative work to define the extent of soil contamination is also to <br /> be included in the revised work plan. The lateral and vertical extent <br /> of soil contamination at this site is to be defined. <br />