Laserfiche WebLink
HORIZON ENVIRONMENTAL INC. <br /> Specialists in Site Assessment,Remedial Testing,Design and Operation LF f j�' ' , <br /> r <br /> January 25, 2006 vl E�I <br /> Mr. Rob Fishburn f A I`a 2 6 L G <br /> Ultramar Inc. ENVIRONNIF[(IT HEALTH <br /> 685 West Third Street PERMIT/SERVICES <br /> Hanford, California 93230 <br /> Subject: Quarterly Groundwater Monitoring/ Remediation System Report <br /> Fourth Quarter 2005 <br /> Beacon Station No. 3641 <br /> 1210 East Hammer Lane, Stockton, California <br /> Mr. Fishburn: <br /> Horizon Environmental Inc. (Horizon) has prepared this Quarterly Groundwater Monitoring <br /> Report / Remediation System Report which presents results for the fourth quarter at the <br /> subject site located in San. Joaquin County as shown on Figure 1. There are twelve <br /> groundwater monitoring wells (MW-1 through MW-7 and MW-9 through MW-13), eight <br /> vapor wells (VW-1 through VW-8) and one sparge. well (SW-1) associated with the site <br /> (Figure 2). The off-site monitoring well MW-8 was destroyed in April 2003. Monitoring <br /> wells MW-9 through 1\4W-13 were installed during fourth. quarter 2004 and are included in <br /> =;:3 the quarterly monitoring program starting; second qua_rtPr 2005. The wells are sampled <br /> according to the program contained in Attachment A. <br /> Horizon conducts operation and maintenance activities at the.situ for vapor extraction and air <br /> sparge systems. Operation of the remediation systems was initiated in March 2005. <br /> Groundwater Monitoring <br /> Groundwater monitoring activities were conducted by Doulos Environmental Company <br /> (Doulos) on December 29, 2005 according to Ultramar Field Procedures (Attachment A). <br /> Monitoring activities included measurement of static groundwater level, purging groundwater <br /> from the wells, collection of groundwater samples, and preparation and delivery of the <br /> samples to the analytical laboratory. <br /> The depth to groundwater was measured to the nearest 0.01 foot from the top-of-casing <br /> (TOC) in monitoring wells MW-1 through MW-7, MW-9 through MW-13, sparge well SW-1 <br /> and vapor wells VW-1, VW-3, VW-5 and VW-7. Vapor wells VW-2, VW-4, VW-6 and <br /> VW-8 were dry. The physical parameters conductivity, pH and temperature of the <br /> groundwater were monitored with field instrumentation during the purging process. The <br /> visual characteristics of the groundwater were also noted during the purging process. Field <br /> groundwater level and purge data were recorded on the Doulos Groundwater Level Data and <br /> Sampling Information Sheets (Attaclu-nent B). <br /> 4970 Windplay Drive,#C5 • EI Dorado Hills,CA 95762 • (916)939-2170 • FAX(916)939-2172 <br /> PO.Box 5283 • Bakersfield,CA 93388 • (661)589-8389 • FAX(661)589-1456 <br />