I have a customer that needs 4 cu. yd. of lava rock installed. There is pine straw in place of it at the moment , this needs to be removed and the rock installed , most prices i have got on lava by the yard are around $100.00 per cu . yd.What would be a good estimate of the total price of the job?considering the rock , landscape cloth installed , and the pinestraw removed ? thank you.