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Project No 58100-06-11 ' March 29, 1995 Page 3 ' PROJECT SCOPE Pre-field Activities A pre-work site visit was conducted with Ms Rebecca Trout of Geocon, and Mr Saiyed Ali of Caltrans on March 1, 1995 The project site and proposed scope of work was reviewed at the pre- work site visit in addition to executing the contract documents A project Health and Safety Plan dated March 3, 1995, was prepared to provide guidelines on the 1 use of personal protective equipment(PPE) during the field activities A project Workplan dated March 3, 1995, was prepared outlining the groundwater purging and sampling procedures as well as the quality assurance/quality control sampling procedures The draft project plans were verbally approved by Mr Saiyed Ali on March 2, 1995 Field Activities - Groundwater Level Measurements and Flow Direction Representatives of Geocon measured the groundwater level within the existing monitoring wells (MW-1 through MW-3) on March 6 and 8, 1995 Groundwater was encountered at a depth of approximately 65 feet below the top of each well casing A summary of the top of well casing elevations, groundwater level measurements and groundwater elevations are presented on Table I The groundwater elevations presented on Table I are based on a well casing elevation survey performed by Caltrans on October 27, 1993 Based on the information presented on Table 1, the groundwater flow on March 8, 1995 was directed to the north at a gradient of 0 0007 ft/ft as depicted on Figure 2 ' Well Purging and Sample Approximately three well volumes of water (39 gallons) was purged from each monitoring well ' on March 6, 1995 During the well purging activities, the groundwater was monitored for pH, electrical conductivity and temperature The purge water was retained onsite in labeled 55-gallon drums The purging equipment was cleansed and rinsed between wells by washing the equipment with a Liquinox solution followed by subsequent tap water rinses Following well purging, a water sample was collected from each well using a Voss polyethylene t disposable bailer and decanted into a one-liter bottle and three volatile organic analyses (VOA) vials The samples were sealed, labeled and placed in an ice chest containing ice The samples were transported to Advanced Technology Laboratories of Signal Hill, California, using standard ' chain-of-custody documentation Laboratory Analysis The water samples were submitted to the laboratory for the analysis of TPHg and TPHd following EPA Test Method 8015 modified and BTEX following EPA Test Method 8020 The results of the laboratory analyses are presented on the attached Table I The laboratory reports and chain-of=