Laserfiche WebLink
HORIZON ENVIRONMENTAL INC. <br /> Specialists in Site Assessment, Remedial Testing, Design and Operation <br /> January 19, 2001 <br /> Mr. Joe Aldridge l <br /> Ultramar Inc. <br /> 525 West Third Street <br /> Hanford, California 93230 <br /> Subject: Quarterly Groundwater Monitoring Report <br /> Fourth Quarter 2000 <br /> Beacon Station No, 12474 <br /> 3440 East Main Street, Stockton, California <br /> Mr. Aldridge: <br /> Horizon Environmental Inc. (Horizon) has prepared this Quarterly Groundwater Monitoring <br /> Report which documents the results of fourth quarter 2000 groundwater monitoring at the <br /> subject site located in San Joaquin County as shown on Figure 1. There are currently 12 <br /> groundwater monitoring wells (MW-1 through MW-12), seven vapor extraction wells (VW- <br /> 1 through VW-7) and one air sparge well associated with this site. All of the wells are <br /> located on site, except for monitoring wells MW-4 and MW-5, which are located in street <br /> • right-of-ways.north of the site (Figure 2). <br /> Groundwater Monitoring <br /> Groundwater monitoring activities were conducted by Horizon on 22 December 2000. <br /> Monitoring activities included measurement of static groundwater level, purging <br /> groundwater from the wells, collection of groundwater samples, and preparation and <br /> delivery of the samples to the analytical laboratory. Horizon Field Methods and Procedures <br /> are presented as Attachment A to this report. <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-6, MW-8 through MW-12, vapor extraction <br /> wells VW-1 and VW-4, and air sparge well AS-1. Vapor extraction wells VW-2 through <br /> VW-5 and VW-7 were dry. Field groundwater level data are included on Horizon <br /> Monitoring Well Data sheets (Attachment B) and are summarized in Table 1. <br /> Field groundwater monitoring well purge data are included on Horizon Monitoring Well <br /> Data sheets. The physical parameters conductivity, pH and temperature were monitored <br /> with field instrumentation during the purging process. The visual characteristics of turbidity <br /> and presence of free product or sheen, and the obvious olfactory characteristics of the <br /> groundwater were also noted during the purging process. <br /> 5011 Golden Foothill Parkway, Suite 7 • EI Dorado Hills, CA 95762 . (916) 939-2170 • FAX (916) 939-2172 <br /> P.O. Box 5283 • Bakersfield, CA 93388 • (661) 589-8389 FAX (661) 589-1456 <br />