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Mr.John Johnson Project 113-26-03, April 20, 1995 Page 3 Date Well TPH-g _ Benzene 3`oluene Ethylbenzene X,, l�eues 9/22/92 4 0 75" free product 2/93 4 45,000 7,100 2,600 440 7,500 5/93 4 32,000 6,300 1,700 380 5,600 8/93 4 28,000 5,400 810 320 3,600 11/93 4 41,000 2,200 920 240 6,800 9/8/94 4 2,500 350 25 25 180 12IZ2/94 4 3.700 570 92 58 470 IL Current Activities Groundwater samples were obtained on March 15, 1995. Prior to sampling, groundwater elevation measurements were obtained using an electric water-level meter. Results are presented in the table below. Table 2 - Well Data Cheaper! store #37, 15 East Grant Line Road, Tracy, California March 15, 1995 Well # Well Top Elevation Depth to GW GW Elevation* MW-1 100.20 5.47 94.73 MW-2 100.20 565 94.55 MW-3 101.40 6.81 94.59 MW-4 9920 452 9468 An arbitrary elevation of 100 0' was established on the site All elevations given in feet. Groundwater elevation was about 0.6 feet higher than in December, 1994, and 1.2 feet higher than to September, 1994. The groundwater gradient was about 25° east of south, with a gradient of 0.0017 (1.7 feet per 1,000 feet), as shown in Figure 2. In the spring, summer, and fall, groundwater flow is usually to the northeast at thus site, but shifts to the southeast when water levels rise far enough This is possibly attributable to infiltration in Pescadero Park, just northwest of the site. According to Mr. Dan Busch, Tracy Park Superintendent, Fl Pescadero Park was not designed for stormwater infiltration, but it floods in winter, rendering its sports fields unusable. Each monitoring well was purged using an electric submersible pump prior to sampling At least 12 gallons were removed from each well, more than three well volumes per well. Water levels after purging have shown no significant change prior to sampling at this site. All purge water was placed in a sealed metal drum. Before the next well was purged and sampled, the pump was run in one bucket with TSP (tnsolum phosphate) and two separate buckets with tap water. All purge water and equipment wash water was placed in DOT 17H 55-gallon steel drums and remains on-site The water and drums will be disposed on your authorization with . documentation forwarded upon completion Parker Environmental Services, 190 East 7th Street, Pittsburg, CA 94565-2317 Phone (510) 439-1024 Fax (510) 439-2566