Laserfiche WebLink
.}CAMBRIA <br /> October 25, 2001 <br /> Mr Harlin Knoll <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 East Weber Avenue, Third Floor c <br /> Stockton, California 95202 <br /> Re Groundwater Monitoring Report—Third Quarter 2001 r� <br /> Shell-branded Service Station c <br /> 3725 Tracy Boulevard <br /> Tracy, California <br /> SAP Code 136186 <br /> Incident No 98996222 <br /> Dear Mr Knoll <br /> Cambria Environmental Technology, Inc (Cambria) prepared this report on behalf of Equiva <br /> Services LLC in accordance with quarterly reporting guidelines issued by the Central Valley <br /> Regional Water Quality Control Board and San Joaquin County Public Health Services, <br /> Environmental Health Division (SJCPHS) <br /> • <br /> THIRD QUARTER 2001 ACTIVITIES <br /> Groundwater Monttoring Blaine Tech Services, Inc (Blaine) of San Jose, California gauged <br /> and sampled all site wells and prepared a summary table of field gauging data and gasoline <br /> constituents Cambria prepared a site vicinity map (Figure 1) and a groundwater <br /> contour/chemical concentration map (Figure 2) Cambria also prepared a graph (Figure 3) which <br /> is a plot of MTBE concentration in BF-1 versus time Cumulative mass removed is also shown <br /> on the graph Blaine's report,presenting the laboratory report, is included as Appendix A <br /> Groundwater Remediation Monthly groundwater extraction (GWE) using a vacuum truck <br /> began February 7, 2000 During May 2001 the frequency of GWE was increased to twice a <br /> month Between July 23 and September 28, 2001, a total of 21,100 gallons of groundwater was <br /> San Ramon CA <br /> Oakland c A removed from wells MW-1A and BF-1 A summary of the volume of groundwater extracted at <br /> Sonoma CA the site and an estimate of the amount of total purgeable hydrocarbons as gasoline (TPHg), <br /> P o r t I a n d OR benzene, and methyl tertiary butyl ether (MTBE) removed is presented in Table I The mass <br /> Camina removal calculations were adjusted this quarter according to a new convention that assumes a <br /> Environmental concentration of one half the detection limit(when the concentration is below the detection limit) <br /> ethnology, Inc for the purpose of calculating mass removed Cambria believes that this convention yields a <br /> Perkins Street <br /> more realistic estimation of mass removed <br /> P 0 Box 259 <br /> Sonoma CA 95476 <br /> Tel(707)935-4850 <br /> Fax(707)935-6649 <br />