SITE INFORMATION AND CORRESPONDENCE_1985-1997

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�r M@IORANDUH ' . TO: Mary SEP 2 2 1992 ENVIRONMENTAL HEALTH FROH: Robert PERMIT/SERVICES DATE: September 18, 1992 RE: UNOCAL Clean Up - Robinhood Plaza Attached is a copy of Kleinfelder & Associates, Recovery Well, Monitoring Well, & Soils Boring Location Map dated June 12, 1987. On this map I have color coded the plan to the best of my knowledge. As you can see on the bottom of the map, I have indicated legend. YELLOW represents fencing, GREEN indicates the wells, BLUE represents open hole or pit, PINK is where the dirt was stockpiled, and ORANGE is the ramp into the site. You can also see on the map asphalt on the site at the time. This map does not show the location of the electronic readerboard HERB, or the placement of the transformer (HERB) . A trench was dug for the power to HERB, approximately four feet to the left side of the remaining asphalt after removal of asphalt by other contractors. Stone Bros. only removed the concrete island. I only remember monitoring wells (MW) #4 and #5 prior to the construction at the site. They were dug out and the soil was aerated. I do not recall where HW #9 was located. As I recall, UNOCAL erected the fence and the ramp. Where the hole was dug out, dirt was placed over the wells. When the holes were refilled, they were graded and turned over to us "as-is", and no additional grading of the lot was done, except for the northern part of where the building now sits, where we widened the parking lot area as it is today. The only existing wells known are the three I have circled in black, located along Pacific Avenue. We took precautions and covered them. To the best of my knowledge, we started work around Bldg. "E", and installed the parking lot north of Bldg. "E" around June 1989. The actual building work on Bldg. "E" commenced around the end of March or 1st of April 1990. To my knowledge, all other wells were destroyed before turning the site over to us to begin con- struction. At the time we laid out the building and excavated the footings, there was never any information from any sub-contractor as to discovery, hitting, or destroying any well on the site. Regarding W5 (Reference: Figure 2, by Kaprealian Engineering Inc. ) , my foreman John Dominick recalls seeing it when land-scape irrigation was being installed around the building. It was covered with dirt, so John uncovered the well (I assume it was W5, it was in the general vicinity) . There was no concrete around it, just a plastic pipe in the ground. We went back to look for the well recently, and were not able to locate it. John said, that at one time a group of men (company unknown) were looking for any exposed wells to be destroyed. We do not know if they took care of this well at the time or not. b:\drl-#2\robert\unocal.917 Printed: September 18, 1992 Page 1