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L NEALTh <br /> GROUNDWATER S` f'VICE <br /> ELO] TECHNOLOGY, INC. �� 0, �' <br /> 1401 Halyard Drive,Suite 140,West Sacramen o,CA 95691,(916)372-4700 <br /> FAX(916)372-878I <br /> February 28, 1995 <br /> Ms. Mary Meays <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 445 San Joaquin Street <br /> P. O. Box 388 <br /> Stockton, California 95201-0388 <br /> Subject: Request for Site Closure <br /> Chevron Service Station No. 9-7780 <br /> 3246 East Fremont Street <br /> Stockton, California <br /> GTI Project 02070 0072 <br /> Dear Ms. Meays: <br /> Groundwater Technology, Inc. submits this letter as an addendum to the Request for Site Closure letter <br /> dated January 3, 1995 for the former Chevron service station #9-7780 located at 3246 East Fremont Street <br /> in Stockton, California. Questions regarding the hydrocarbon-mass remaining calculation (Attachment 3) <br /> were brought up after regulatory review of the report in late January 1995. Groundwater Technology has <br /> reviewed the previous calculation and has found a discrepancy between the impacted area as depicted on <br /> Figure 4 and the area used in the calculation in Attachment 3. The hydrocarbon-impacted area (15-30 feet <br /> BGS) in Figure 4 was re-calculated using digital planimetry and is estimated at 955 square feet not the 500 <br /> square feet originally reported and used in the calculation. The area encompassed by the 30-40 feet BGS <br /> contour on Figure 4 was calculated to be approximately 380 square feet. Groundwater Technology has also <br /> revised the bulk density factor for soil used in the calculation to 1.35 grams per cubic centimeter as <br /> published in various texts. Any mention of the hydrocarbon mass in the previous report should be amended <br /> to read 262 pounds of hydrocarbons, 39-gallon gasoline equivalent. It should be mentioned that the <br /> calculation of remaining hydrocarbon mass Includes multiple sources of compounding errors. Therefore, <br /> the most accurate method of presenting the data would be to report the data as a range of values. The <br /> remaining mass of hydrocarbons should be reported conservatively between 200 and 300 pounds of <br /> hydrocarbons remaining in place. <br /> 0072add.1tr <br /> Offices throughout the U.S.,Canada and Overseas <br />