ARCHIVED REPORTS_XR0006279 - Laserfiche WebLink

Home Browse Search

THE MARK In ribGROUP, INC. ENGINEERS & GEOLOGISTS August 16, 1994 92-1177103 80 ' NORCAL Waste Systems, Inc 5 Thomas Mellon Circle San Francisco, CA 94134 1 Attention Mr Larry Sweetser, Director of Regulatory Affairs Subject REPORT - Quarterly Groundwater Monitormg - July 1994 Stockton Scavenger Association Facility 1240 Navy Drive Stockton, California Dear Mr Sweetser The MARK Group, Inc (MARK) has completed the July 1994 quarterly groundwater monitoring for the Stockton Scavenger Association (SSA) Facility located at 1240 Navy Drive, ' Stockton, California Monitoring was performed according to the Central Valley Regional Water Quality Control Board (RWQCB) guidelines The investigation showed that groundwater continues to flow northeast and that ongoing + pumping at monitoring well MW-2 apparently has not altered groundwater flow patterns at the site Further, analytical data shows no significant change in groundwater quality from the previous monitonng period The site location is shown in Drawing 1 Groundwater Sampling ' On July 19, 1994, MARK staff recorded water level measurements, then purged and sampled groundwater monitoring wells MW-1, MW-2, MW-3, and MW-4 Well locations are shown in Drawing 2 Static water levels in the monitoring wells were measured using an electronic sounder-tape ' within a one hour period prior to purging the wells The data was used in interpreting the potentiometnc groundwater surface at the site Water level measurements for the current monitoring period and previous rounds are presented in Table 1 A copy of the recent water level measurement form is attached to this letter The monitoring wells were purged before the collection of groundwater samples to ensure ' that representative formation groundwater was sampled A minimum of three casing volumes of groundwater was removed from the wells Field water quality parameters (pH, temperature, and specific conductance) were measured until they stabilized An additional casing volume of ' groundwater was purged after sampling in accordance with California Code of Regulations Chapter 15 post-purging requirements Purged groundwater was pumped into a Baker tank for temporary storage prior to being treated by the onsite groundwater treatment system Copies of the purging/sampling forms are attached Also attached are copies of the purging/sampling ' Hookston Square, Suite 120 3480 Buskirk Avenue - Pleasant Hill, CA 94523 - (510) 946-1055 - FAX (510) 946-9813