ARCHIVED REPORTS_XR0011037 - Laserfiche WebLink

Home Browse Search

-P MAP F F L",Working to Restore Nature JUN 3 1992 1710 Main Street ENVIRONIV NTAL HEALTH Escalon, CA 95320 PERPb`[tT�SEF'I��lCES Phone (209) 838-3507 FAX (209)838-3509 June 2, 1992 Harlin Knoll San Joaquin County Public Health Services Environmental Health Division P O Box 2009 Stockton, California 95201 RE Chevron U S A Production/Carnation Plant 540 North Aurora Way, Stockton, CA Dear Mr Knoll This letter updates RESNA Industries First Quarter 1992 activities at the above referenced site (Figure 1) Groundwater monitoring and sampling was conducted on February 18, 1992 by RESNA personnel Water level measurements were collected from each monitoring well using a Solinst Water Level Meter (Model 101) Groundwater monitoring of wells MW1, MW2,� and MW3 showed an increase in the groundwater table elevation since last monitoring in August 1991, averaging 0 32 feet (Attachment 1) Table 1 summarizes groundwater elevation information A groundwater gradient map was created using the February 18, 1992 data The groundwater gradient is approximately 0 027 feet/feet or 142 feet/mile in a northeast direction (Figure 2 } Prior to sampling, 3 to 5 well volumes of water were purged from each well All purged water was pumped into an onsite baker tank for future treatment Groundwater samples were collected from three wells after stabilization of pH, electrical conductivity (EC) and temperature The samples were collected using a dedicated, disposable bailer The samples were sent to state- certified RESNA Environmental Laboratories in Fremont, California All samples were analyzed for benzene, toluene, ethylbenzene, xylenes (BTEX) using EPA method 8020/ 602, total petroleum hydrocarbons as gasoline (TPHg) and diesel (TPHd) using modified EPA method 8015 Petroleum hydrocarbons and BTEX constituents were not detected in monitoring wells MW2 and MW3 However, MW 1 contained a detectable TPHg level of 120 ppb No aromatics were iQR051192 MAD i