ARCHIVED REPORTS_XR0012297 - Laserfiche WebLink

Home Browse Search

r.' titer! i SERVICES, INCORPORATEDi i�;r1 yt i +� '"F1 �-I IP rf P�s { n 2 09 MPDS-UN2859--01 December 17, 1993 Unocal Corporation 2000 Crow Canyon Place, Suite 400 P O Box 5155 San Ramon, California 94583 Attention Mr Robert A Boust RE Quarterly Data Report Former Unocal Service Station #2859 1665 Pacific Avenue Stockton California Dear Mr Boust This report presents the results of the most recent quarter of monitoring and sampling of the monitoring wells at the referenced site by MPDS Services, Inc The wells are currently monitored and sampled on a quarterly basis This report covers the work performed by MPDS Services, Inc in November of 1993 RECENT FIELD ACTIVITIES The seven monitoring wells (MW-1 through MW-7) were monitored and sampled once during the quarter Prior to sampling, the wells were checked for depth to water and the presence of free product or sheen The monitoring data collected this quarter are summarized in Table 1 Ground water samples were collected from all of the monitoring wells on November 12 , 1993 Prior to sampling, the wells were each purged of between 0 5 and 9 gallons of water During purging operations, the field parameters pH, temperature, and electrical conductivity were recorded and are presented in Table 2 Once the field parameters were observed to stabilize and a minimum of approximately four casing volumes had been removed from each well (except well MW-3 , which dewatered) , samples were then collected using a clean Teflon bailer The samples were decanted into clean VOA vials that were then sealed with Teflon-lined screw caps, labeled, and stored in a cooler, on ace, until delivery to a state- certified laboratory 2401. Stanwell Drive, Suite 400 Concord, California 94520 Tel (510)602-51.20 Fax (510) 689-1918