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a - <br /> 4il <br /> IT Corporation <br /> 757Arnold Drive, Suite D <br /> L Martinez, CA 94553-6526 <br /> S I el 925 370 3990 <br /> the Ai } 2 O Pax 925 370 3991 <br /> ®�■ O� 04 VIRONMENTAL HE A Alcmber of rhe IT Group <br /> Weber Ave Third Flop�IVISION <br /> �' O BOX 388, Stackt CA 96201-D388 <br /> Approved G <br /> 1 Denied � <br /> January 29, 1999 Conditions _e _e, - ! <br /> Y <br /> Mr Bob DeNinno Z f-Je�.�-t.� <br /> The Southland Corporation <br /> 10220 S W Greenburg Road, Suite 470 <br /> Portland, OR 97233 /J-t � -k, <br /> - <br /> Subject Fourth Quarter 1998 Monitoring and Sampling Report, and Work Plan <br /> for Additional Subsurface Investigation <br /> Southland Store No 19976 <br /> 1399 North Mom Street <br /> Manteca, California <br /> Project 103998 <br /> Dear Mr DeNinno <br /> This Fourth Quarter 1998 Monitoring and Sampling Report, and Work Plan for Additional Subsurface <br /> Investigation presents the results of monitoring and sampling activities performed by IT Corporation <br /> (formerly Fluor Daniel GTI) at the subject site (Figures 1 and 2,Attachment 1) on December 30, 1998, and <br /> proposes further work to be conducted at the site to complete site assessment requirements A summary <br /> of activities conducted during this reporting period is provided below <br /> Depth to water(DTW) was gauged in four site-related groundwater monitoring wells (MW-1, MW_ <br /> 1A, MW-2 and MW-3) <br /> Groundwater samples were collected from the four monitoring wells and submitted to a California- <br /> certified laboratory for analysis of benzene, toluene, ethylbenzene and total xylenes(BTEX),total <br /> petroleum hydrocarbons-as-gasoline (TPH-G), methyl-tert-butyl-ether(MTBE),tert-butanol (TBA), <br /> 1 diisopropyl ether(DIPS), ethyl-tert-butyl ether(ETRE), and tert-amylmethyl ether(TAME) <br /> GROUNDWATER MONITORING DATA <br /> Groundwater monitoring of the four wells was performed on December 30, 1998 Before monitoring, the <br /> well caps were opened to allow the water in each well to stabilize to atmospheric pressure The OTW was <br /> measured to the nearest 0 01 foot from the top of the well casing using an ORS Environmental Equipment <br /> INTERFACE PROBETm Well Monitoring System <br /> A potentiometnc surface map was prepared using the groundwater elevation data collected on December <br /> 1 30, 1998 (Figure 2) Based on the groundwater elevation data, groundwater flow is toward the northwest at <br /> a gradient of approximately 0 001 ft/ft During the September 16, 1998, monitoring and sampling event it <br /> appears that the samples and monitoring data for wells MW-1 and MW-1 A were switched Monitoring well, <br /> 1 MW-I/MW-1A is a dual-nested well with MW-1 being the shallow well and its water table elevation (WTE) <br /> used in contouring Analytical and monitoring data taken on September 16, 1998, for MW-1 and MW-1A <br />