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' CAM B R I A � }^ <br /> fy � `� 'Y''t I L" <br /> L <br /> • AiN --S PIS 1 22 <br /> July 21, 1999 <br /> Margaret Lagorio <br /> San Joaquin County Environmental Health Division <br /> P O Box 388 <br /> Stockton, California 95202 <br /> Re Quarterly Monitoring Report — Second Quarter 1999 <br /> Sheil-branded Service Station <br /> 7910 Lower Sacramento Road <br /> Stockton, California <br /> Incident 998996180 <br /> SAP ##136139 <br /> Dear Ms Lagorio <br /> This Quarterly Monitoring Report describes the recently completed activities associated with <br /> groundwater monitoring and sampling at the referenced site (Plates I and 2) This report was <br /> prepared to meet reporting requirements issued by the Regional Water Quality Control Board, <br /> Central Valley Region and the San Joaquin County Environmental Health Division <br /> Quarterly Monitoring & Sampling Summary <br /> Groundwater monitoring and sampling for this quarter is summarized below <br /> Blaine Tech Services, Inc (Blaine) of San Jose, California measured groundwater <br /> levels and collected samples from Wells MW-] through MW-3 on May 28, 1999 <br /> Samples were transported to Sequoia Analytical (Sequoia) in San Carlos, California for <br /> chemical analysis <br /> + Cambria Environmental Technology, Inc (Cambria) evaluated water-level <br /> measurement data and prepared a groundwater contour/chemical concentration map <br /> (Plate 2) Groundwater flow direction is northwesterly at an approximate hydraulic <br /> gradient of 0 008 <br /> Oak4and CA <br /> Sonoma CA + None of the groundwater samples contained detectable levels of TPPH Benzene and <br /> Portland OR <br /> S e a t t I e WA MTBE were not detected in Wells MW-1 and MW-2 Well MW-3 contained a <br /> benzene concentration of 0 565 ppb, and an MTBE concentration of 79 3 ppb <br /> Cambria <br /> Environmental <br /> Technology,Inc <br /> Perkins Street <br /> Box 259 <br /> Sonoma CA 45476 <br /> Te�(707)935-4850 <br /> Fax(7o7)935-6649 <br />