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MAR-17-1999 1353 ALTON rEIDEl._IENCE 925 606 9260 P.02/10 <br /> r1ALTON <br /> GEOSCIENCE <br /> February 19, 1999 <br /> J We�r�Fh'Tq <br /> er C <br /> San Joaquin County Public Health Services / q 0"'388qVe TN <br /> ThyFgo <br /> 304 East Weber Street, Third Floor / �e pia�d 5����q oor1)t V/5/ <br /> Stockton, California 95202 °ndi . S Q 9520( �3��-0?40-02 <br /> 8g <br /> ATM: MR. STEVE SASSON \ - <br /> b <br /> SITE_ CHP FACHM <br /> 3330 NORTH AD ART ROAD �c-' <br /> STOCKTON, CALIFORNIA <br /> RE: SUBSURFACE INVESTIGATION WORKPLAN <br /> Dear Mr. Sasson: <br /> Alton Geoscience submits this workplan for the California Highway Patrol facility, located at 3330 <br /> North Ad Art Road in Stockton, California(Figure 1). <br /> 1.0 OBJECTIVES <br /> The planned site assessment activities will be performed to determine if any contaminated soil exists <br /> in the immediate vicinity of an existing gasoline underground storage tank (UST) at the above <br /> referenced site. <br /> 2.0 STI'E DESCRIMON <br /> The site is currently a CHP Station with a gasoline UST and pump for fueling CHP vehicles <br /> (Figure 2). <br /> The site is locatod about 1,000 feet east of Highway 99 at an elevation of approximately 30 feet <br /> above mean sea level (NGVD-1929). Topography in the vicinity of the site is relatively flat, <br /> sloping slightly to the west. <br /> The site lies in the Central Valley of California. Geologically, the valley is a large asymmetric <br /> trough that is bounded by pre-Tertiary granitic, metamorphic, and marine sedimentary rocks. The <br /> trough has been filled with as much as 30,000 feet of sediment in the San Joaquin Valley to the <br /> south and as much as 60,000 feet of sediment in the Sacramento Valley to the north. These <br /> sediments range in age from Jurassic to Holocene and include both marine and continental <br /> sedimentary deposits(USGS 1986). <br /> The scope of this investigation includes only the uppermost deposits within the Central Valley. <br /> Continental deposits of Tertiary and Quaternary age compose a number of formations; in total they <br /> R V 1 N E l 1 V E R M O R F N 0 A?N R 1 0 G E S A N D I E G 0 • S A N T A F E S P R I N G S <br /> , ..__.. _ ,.. .„ .o rohfn,nlo 0nFan-u501 . IaP51609.915() • FAX(9251606-9260 • www.aliongeo.com <br />