SITE HISTORY - Laserfiche WebLink

Home Browse Search

ENVIRONMENTAL MANAGEMENT, INC. January 3, 2003 Project C81-2375 Grant San Joaquin County Environmental Health Department 304 East Weber, Third Floor Stockton, CA 95202 Re: Work Plan Shell Branded Service Station 2375 Grant Line Road Tracy, CA 95376 Equilon Enterprises LLC dba Shell Oil Products LIS (Shell) has initiated a groundwater monitoring program throughout California known as GRASP (GRoundwater ASsessment Program). The purpose of the program is'to provide long term monitoring for the presence nHi � of petroleum hydrocarbons,in groundwater beneath selected service station sites. No known releases have occurred at these sites nor are any of them an active LUFT case. The service station located at 2375 Grant Line Road in Tracy has been designated by Shell as a participant in this program (Figure 1). The.program requires four (4) groundwater monitoring wells to be installed on the service station property and periodically monitored (Figure 2). Ori behalf of Shell, KHM Environmental Management, Inc. (KHM) will manage the installation of these wells, and the periodic groundwater sampling events that will follow (typically quarterly). `Four.borings will be advanced at the site using hollow-stem auger drilling equipment. Each boring will be logged by a staff geologist, and soil samples will be collected from selected intervals for laboratory analysis. Laboratory analysis include total petroleum hydrocarbons as gasoline (TPH-G); total petroleum hydrocarbons as diesel (TPH-D); benzene, toluene, ethylbenzene, and total xylenes (BTEX); and the five fuel oxygenates methyl tert-butyl ether (MTBE), diisopropyl ether (DIPS), ethyl-t-butyl ether (ETBE), tert-amyl methyl ether (TAME), and tert-butanol (TBA). The'.borings.will be-terminatedat.a depth that is approximately 10 feet below the depth at which groundwater is first encountered (which is anticipated to be at approximately 10 feet 4 bgs). Monitoring wells will be installed in' the borings and will be constructed with Schedule 40, polyvinyl chloride casing and screen. Wells will be screened over a 20-foot interval, and #2/12 sand will be used for the filter pack. A 1-foot bentonite seal will be 6284 SAN IGNACIO AVENUE,SUITE E SAN JOSE,-CALIFORNIA • 95119 • PHONE:(408)224-4724 FAX:(408)224-4518 REDMOND,WASHINGTON PORTLAND,OREGON CROCKETT,CALIFORNIA MONROVIA,CALIFORNIA (425)558-0134 (503)233-4068 (530)787-6756 (626)256-6662, .