comprehensive site investigation and remediation objectives report

• Depth at which saturated conditions are first encountered
• Headspace screening results
• Sample identification and depths
• Zones of caving or heaving
• Refusal
Disposable sampling equipment will be used to the extent possible; however, all reusable
equipment that may directly or indirectly contact samples will be decontaminated prior to
each use.
The direct push sampling technique can also be used to collect groundwater samples, by
driving a temporary vertically slotted screen to the groundwater sampling interval. The
groundwater is then collected by inserting Teflon tubing to the end of the screen and
attaching the upper end to a peristaltic pump. The water is purged and allowed to
recharge, if necessary. Temperature, pH and specific conductivity or TDS will be
measured after each well volume is removed. Development will continue until these
parameters have stabilized within the following criteria for three consecutive readings
within + 10 % of previous readings for temperature and TDS, + 0.1 unit for pH, and +3%
for specific conductance. If these criteria have not been attained after 2 hours,
development activities will be suspended, the well will be considered “developed” and
water samples will be collected. The water is then immediately transferred into
appropriate sampling containers and placed on ice until it can be analyzed.