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26 October 2000 AGE-NC Project No 97-0333 Page 4 of 7 flow direction in Manteca is generally toward the northwest, although flow directions may be both locally and seasonably variable Based on ground water monitoring data collected at the site on I I July 2000, depth to ground water was recorded at 15 feet bsg and ground water flow direction was inferred to be flowing towards the north at a gradient of 0 001 ft/ft 3.0. SCOPE OF WORK Based on the results of the previous investigations and UST removal activities, ground water at the site has been impacted The lateral and vertical extent of impacted ground water must be determined prior to the initiation of remediation The assessment activities will consist of the following tasks • Permitting and pre-field work activities, • CPT soil boring advancement, A Grab ground water sample collection and analysis, Report preparation 3 1 PERaIrIITTLNG AND PRE-FIELD WORK ACTWITIES Applicable site assessment permits will be obtained from the PHS-EHD In addition, an update to the health and safety plan presently on-file will be prepared in accordance with Occupational Safety and Health Guidance Manual for Hazardous Waste Site Activities (National Institute for Occupational Safety and Health Administration, U S Coast Guard and U S Environmental Protection Agency, 1985) Prior to mobilization,the monitoring well location will be clearly marked and a utility clearance obtained through Underground Service Alert 32 CPT DRILLING AND GRAB GROUND WATER SAMPLE COLLECTION 3 AGE proposes to drill five CPT soil bonngs at the site to define the vertical extent of hydrocarbon- impacted ground water Proposed CPT soil boring locations are illustrated in Figure 2 Based on MTBE-impact encountered during the previous investigation, AGE proposes CPT soil bonngs in the following locations td�ur cid C.IUi ll�illFllllllll�dl ,RC