Laserfiche WebLink
,5 <br /> CAMBRIA <br /> l 11 ' 57 <br /> April 19, 2000 <br /> Mr Harlin Knoll <br /> San Joaquin County Public Health Services <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, California 95202 <br /> Re Quarterly Monitoring Report - First Quarter 2000 <br /> Shell-branded Service Station <br /> 3725 Tracy Boulevard <br /> Tracy, California <br /> SAP Code 136186 <br /> Incident No 98996222 <br /> Dear Mr Knoll <br /> This report describes the recently completed activities associated with groundwater <br /> monitoring and sampling at the referenced site (Figures 1 and 2) This report was prepared to <br /> meet reporting requirements issued by the Regional Water Quality Control Board, Central <br /> Valley Region and San Joaquin County Public Health Services, Environmental Health <br /> Division <br /> Monitoring & Sampling Summary <br /> Groundwater monitoring and sampling for this quarter are summarized below <br /> • Blaine Tech Services, Inc (Blaine) of San Jose, California measured groundwater levels <br /> and collected groundwater samples from wells MW-IA through MW-3A and BF-1 on <br /> February 18, 2000 Samples were transported to Sequoia Analytical of Petaluma, <br /> California for chemical analyses <br /> • Cambria Environmental Technology, Inc (Cambria) evaluated water-level measurement <br /> data and prepared a groundwater contour map (Figure 2) Groundwater flow is to the <br /> northeast at an approximate hydraulic gradient of 0 002 <br /> Oakland CA <br /> San Ramon CA . MTBE (by EPA Method 8020) was detected in wells MW-lA through MW-3A and BF-1 <br /> Sonoma CA <br /> Portland OR at concentrations ranging from 3 23 to 122,000 ppb MTBE was confirmed (by EPA <br /> Method 8260B) in wells MW-IA, MW-2A, and BF-1 with concentrations ranging from <br /> Cambria 248 to 148,000 ppb Benzene and TPHg were not detected in any of the wells sampled <br /> Environmental A chemical concentration map was prepared and is presented in Figure 2 <br /> Technology,Inc <br /> Perkins Street <br /> P 0 Box 259 <br /> Sonoma CA 95476 <br /> Tel(707)935-4850 <br /> Fax(707)935-6649 <br />