ARCHIVED REPORTS XR0010649 - Laserfiche WebLink

Home Browse Search

Ibenzene in wells BM-3 BM--7 and BM--6 which are on the west side of the site. We believe this contamination is comming from the ARCO station located to the west of our site. Wells BM--2 , 3 , 6 , 10 and 11 had no contamination at all and their position defines the zero line along the west and north sides of the site. Well 5 has a small amount of contamination at 15 feet but the fact that the zones below 15 feet are clean to the 40 foot level indicate the northern migration of fuel in the unsaturated zone was very limited. Therefore, we assess the northern limit of the contamination is dust beyond BM-5. Charter Way is located to the south of the site. We had planned to drill one well on the south side of the street to help us define the unsaturated and saturated plume. However, the south Iside of Charter Way contains buried communications lines in the parking lane and under the sidewalk. These buried cables prohibit the drilling on the south side of Charter Way. Caltrans will not allow drilling in the travel lanes of the street. ' Therefore, we are unable to locate a drilling site suitable to define the soil and water. A Preliminary Groundwater Assessment dated November 6, 1992 was prepared by Earth Systems Environmental , Inc. for a gas station located on the southeast corner of Charter Way and Grant Street, Assessor Parcel Number 167-181--01 . This site is diagonally ' across the intersection of Charter Way and Grant Street. This report does not indicate any significant contamination in their ' well MW-3 nor in their boring TH-7 and TH-3 , the two closest borings to our site. From this data we can assume the unsaturated contamination does not extend across Charter Way from ' this site. Groundwater ' Page 6