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THE <br /> MARK <br /> In raG OUP, ,NC. <br /> ENGINEERS & GEOLOGISTS <br /> 3unu 26, 1996 <br /> 92-1177102 97 <br /> NORCAL Waste Systems, Inc <br /> 5 Thomas Mellon Circle <br /> San Francisco, CA 94134 <br /> Attention Ms Amy Dietz, Environmental Chemist <br /> Subject REPORT - Quarterly Groundwater Monitoring - April 1996 <br /> Stockton Scavenger Association Facility <br /> 1240 Navy Drive <br /> Stockton, California <br /> Dear Ms Dietz <br /> The MARK Group, Inc (MARK) has completed the fourth quarter, groundwater <br /> monitoring and sampling event for the Stockton Scavenger Association (SSA) Facility located <br /> } at 1240 Navy Dave in Stockton, California (See Drawing 1) The monitoring event was <br /> performed on April 4, 1996 and was conducted according to the Central Valley Regional Water <br /> Quality Control Board (RWQCB) guidelines <br /> Scope of Work <br /> The scope of work for this quarterly monitoring event consisted of the following <br /> 13 Measuring static water levels in three monitoring wells (MW-1, MW-3, and MW-4) <br /> at the site (MW-2 could not be measured because the pump and treat system is <br /> connected to this well) Well locations are shown on Drawing 2, <br /> o Purging and sampling Monitoring Wells MW-1, MW-2, MW-3, and MW-4, <br /> Recording groundwater field parameters (pli, temperature, specific conductance, and <br /> turbidity) from each well, <br /> ® Analyzing the samples for total petroleum hydrocarbons as diesel (TPH-d), total <br /> petroleum hydrocarbons as gasoline (TPH-g), and benzene, toluene, ethylbenzene, <br /> and xylenes, (BTEX), and <br /> ■ Preparation of this report which includes the results and conclusions regarding the <br /> site groundwater quality <br /> 3480 Buskirk Avenue o Suite 120 a Pleasant Hill, CA 94523 0 (510) 946-1055 a FAX(510) 946-9813 <br />